*initHEADmaster

30 files changed, 9837 insertions, 0 deletions

diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_msctf.h b/source/3rd-party/SDL2/src/video/windows/SDL_msctf.h
new file mode 100644
index 0000000..53cec3d
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_msctf.h
@@ -0,0 +1,242 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_msctf_h_
+#define SDL_msctf_h_
+
+#include <unknwn.h>
+
+#define     TF_INVALID_COOKIE               (0xffffffff)
+#define     TF_IPSINK_FLAG_ACTIVE           0x0001
+#define     TF_TMAE_UIELEMENTENABLEDONLY    0x00000004
+
+typedef struct ITfThreadMgr ITfThreadMgr;
+typedef struct ITfDocumentMgr ITfDocumentMgr;
+typedef struct ITfClientId ITfClientId;
+
+typedef struct IEnumTfDocumentMgrs IEnumTfDocumentMgrs;
+typedef struct IEnumTfFunctionProviders IEnumTfFunctionProviders;
+typedef struct ITfFunctionProvider ITfFunctionProvider;
+typedef struct ITfCompartmentMgr ITfCompartmentMgr;
+typedef struct ITfContext ITfContext;
+typedef struct IEnumTfContexts IEnumTfContexts;
+typedef struct ITfUIElementSink ITfUIElementSink;
+typedef struct ITfUIElement ITfUIElement;
+typedef struct ITfUIElementMgr ITfUIElementMgr;
+typedef struct IEnumTfUIElements IEnumTfUIElements;
+typedef struct ITfThreadMgrEx ITfThreadMgrEx;
+typedef struct ITfCandidateListUIElement ITfCandidateListUIElement;
+typedef struct ITfReadingInformationUIElement ITfReadingInformationUIElement;
+typedef struct ITfInputProcessorProfileActivationSink ITfInputProcessorProfileActivationSink;
+typedef struct ITfSource ITfSource;
+
+typedef DWORD TfClientId;
+typedef DWORD TfEditCookie;
+
+typedef struct ITfThreadMgrVtbl
+{
+    HRESULT (STDMETHODCALLTYPE *QueryInterface)(ITfThreadMgr *, REFIID, void **);
+    ULONG (STDMETHODCALLTYPE *AddRef)(ITfThreadMgr *);
+    ULONG (STDMETHODCALLTYPE *Release)(ITfThreadMgr *);
+    HRESULT (STDMETHODCALLTYPE *Activate)(ITfThreadMgr *, TfClientId *);
+    HRESULT (STDMETHODCALLTYPE *Deactivate)(ITfThreadMgr *);
+    HRESULT (STDMETHODCALLTYPE *CreateDocumentMgr)(ITfThreadMgr *);
+    HRESULT (STDMETHODCALLTYPE *EnumDocumentMgrs)(ITfThreadMgr *, IEnumTfDocumentMgrs **);
+    HRESULT (STDMETHODCALLTYPE *GetFocus)(ITfThreadMgr *, ITfDocumentMgr **);
+    HRESULT (STDMETHODCALLTYPE *SetFocus)(ITfThreadMgr *, ITfDocumentMgr *);
+    HRESULT (STDMETHODCALLTYPE *AssociateFocus)(ITfThreadMgr *, HWND, ITfDocumentMgr *, ITfDocumentMgr **);
+    HRESULT (STDMETHODCALLTYPE *IsThreadFocus)(ITfThreadMgr *, BOOL *);
+    HRESULT (STDMETHODCALLTYPE *GetFunctionProvider)(ITfThreadMgr *, REFCLSID, ITfFunctionProvider **);
+    HRESULT (STDMETHODCALLTYPE *EnumFunctionProviders)(ITfThreadMgr *, IEnumTfFunctionProviders **);
+    HRESULT (STDMETHODCALLTYPE *GetGlobalCompartment)(ITfThreadMgr *, ITfCompartmentMgr **);
+} ITfThreadMgrVtbl;
+
+struct ITfThreadMgr
+{
+    const struct ITfThreadMgrVtbl *lpVtbl;
+};
+
+typedef struct ITfThreadMgrExVtbl
+{
+    HRESULT (STDMETHODCALLTYPE *QueryInterface)(ITfThreadMgrEx *, REFIID, void **);
+    ULONG (STDMETHODCALLTYPE *AddRef)(ITfThreadMgrEx *);
+    ULONG (STDMETHODCALLTYPE *Release)(ITfThreadMgrEx *);
+    HRESULT (STDMETHODCALLTYPE *Activate)(ITfThreadMgrEx *, TfClientId *);
+    HRESULT (STDMETHODCALLTYPE *Deactivate)(ITfThreadMgrEx *);
+    HRESULT (STDMETHODCALLTYPE *CreateDocumentMgr)(ITfThreadMgrEx *, ITfDocumentMgr **);
+    HRESULT (STDMETHODCALLTYPE *EnumDocumentMgrs)(ITfThreadMgrEx *, IEnumTfDocumentMgrs **);
+    HRESULT (STDMETHODCALLTYPE *GetFocus)(ITfThreadMgrEx *, ITfDocumentMgr **);
+    HRESULT (STDMETHODCALLTYPE *SetFocus)(ITfThreadMgrEx *, ITfDocumentMgr *);
+    HRESULT (STDMETHODCALLTYPE *AssociateFocus)(ITfThreadMgrEx *, ITfDocumentMgr *, ITfDocumentMgr **);
+    HRESULT (STDMETHODCALLTYPE *IsThreadFocus)(ITfThreadMgrEx *, BOOL *);
+    HRESULT (STDMETHODCALLTYPE *GetFunctionProvider)(ITfThreadMgrEx *, REFCLSID, ITfFunctionProvider **);
+    HRESULT (STDMETHODCALLTYPE *EnumFunctionProviders)(ITfThreadMgrEx *, IEnumTfFunctionProviders **);
+    HRESULT (STDMETHODCALLTYPE *GetGlobalCompartment)(ITfThreadMgrEx *, ITfCompartmentMgr **);
+    HRESULT (STDMETHODCALLTYPE *ActivateEx)(ITfThreadMgrEx *, TfClientId *, DWORD);
+    HRESULT (STDMETHODCALLTYPE *GetActiveFlags)(ITfThreadMgrEx *, DWORD *);
+} ITfThreadMgrExVtbl;
+
+struct ITfThreadMgrEx
+{
+    const struct ITfThreadMgrExVtbl *lpVtbl;
+};
+
+typedef struct ITfDocumentMgrVtbl
+{
+    HRESULT (STDMETHODCALLTYPE *QueryInterface)(ITfDocumentMgr *, REFIID, void **);
+    ULONG (STDMETHODCALLTYPE *AddRef)(ITfDocumentMgr *);
+    ULONG (STDMETHODCALLTYPE *Release)(ITfDocumentMgr *);
+    HRESULT (STDMETHODCALLTYPE *CreateContext)(ITfDocumentMgr *, TfClientId, DWORD, IUnknown *, ITfContext **, TfEditCookie *);
+    HRESULT (STDMETHODCALLTYPE *Push)(ITfDocumentMgr *, ITfContext *);
+    HRESULT (STDMETHODCALLTYPE *Pop)(ITfDocumentMgr *);
+    HRESULT (STDMETHODCALLTYPE *GetTop)(ITfDocumentMgr *, ITfContext **);
+    HRESULT (STDMETHODCALLTYPE *GetBase)(ITfDocumentMgr *, ITfContext **);
+    HRESULT (STDMETHODCALLTYPE *EnumContexts)(ITfDocumentMgr *, IEnumTfContexts **);
+} ITfDocumentMgrVtbl;
+
+struct ITfDocumentMgr
+{
+    const struct ITfDocumentMgrVtbl *lpVtbl;
+};
+
+typedef struct ITfUIElementSinkVtbl
+{
+    HRESULT (STDMETHODCALLTYPE *QueryInterface)(ITfUIElementSink *, REFIID, void **);
+    ULONG (STDMETHODCALLTYPE *AddRef)(ITfUIElementSink *);
+    ULONG (STDMETHODCALLTYPE *Release)(ITfUIElementSink *);
+    HRESULT (STDMETHODCALLTYPE *BeginUIElement)(ITfUIElementSink *, DWORD, BOOL *);
+    HRESULT (STDMETHODCALLTYPE *UpdateUIElement)(ITfUIElementSink *, DWORD);
+    HRESULT (STDMETHODCALLTYPE *EndUIElement)(ITfUIElementSink *, DWORD);
+} ITfUIElementSinkVtbl;
+
+struct ITfUIElementSink
+{
+    const struct ITfUIElementSinkVtbl *lpVtbl;
+};
+
+typedef struct ITfUIElementMgrVtbl
+{
+    HRESULT (STDMETHODCALLTYPE *QueryInterface)(ITfUIElementMgr *, REFIID, void **);
+    ULONG (STDMETHODCALLTYPE *AddRef)(ITfUIElementMgr *);
+    ULONG (STDMETHODCALLTYPE *Release)(ITfUIElementMgr *);
+    HRESULT (STDMETHODCALLTYPE *BeginUIElement)(ITfUIElementMgr *, ITfUIElement *, BOOL *, DWORD *);
+    HRESULT (STDMETHODCALLTYPE *UpdateUIElement)(ITfUIElementMgr *, DWORD);
+    HRESULT (STDMETHODCALLTYPE *EndUIElement)(ITfUIElementMgr *, DWORD);
+    HRESULT (STDMETHODCALLTYPE *GetUIElement)(ITfUIElementMgr *, DWORD, ITfUIElement **);
+    HRESULT (STDMETHODCALLTYPE *EnumUIElements)(ITfUIElementMgr *, IEnumTfUIElements **);
+} ITfUIElementMgrVtbl;
+
+struct ITfUIElementMgr
+{
+    const struct ITfUIElementMgrVtbl *lpVtbl;
+};
+
+typedef struct ITfCandidateListUIElementVtbl
+{
+    HRESULT (STDMETHODCALLTYPE *QueryInterface)(ITfCandidateListUIElement *, REFIID, void **);
+    ULONG (STDMETHODCALLTYPE *AddRef)(ITfCandidateListUIElement *);
+    ULONG (STDMETHODCALLTYPE *Release)(ITfCandidateListUIElement *);
+    HRESULT (STDMETHODCALLTYPE *GetDescription)(ITfCandidateListUIElement *, BSTR *);
+    HRESULT (STDMETHODCALLTYPE *GetGUID)(ITfCandidateListUIElement *, GUID *);
+    HRESULT (STDMETHODCALLTYPE *Show)(ITfCandidateListUIElement *, BOOL);
+    HRESULT (STDMETHODCALLTYPE *IsShown)(ITfCandidateListUIElement *, BOOL *);
+    HRESULT (STDMETHODCALLTYPE *GetUpdatedFlags)(ITfCandidateListUIElement *, DWORD *);
+    HRESULT (STDMETHODCALLTYPE *GetDocumentMgr)(ITfCandidateListUIElement *, ITfDocumentMgr **);
+    HRESULT (STDMETHODCALLTYPE *GetCount)(ITfCandidateListUIElement *, UINT *);
+    HRESULT (STDMETHODCALLTYPE *GetSelection)(ITfCandidateListUIElement *, UINT *);
+    HRESULT (STDMETHODCALLTYPE *GetString)(ITfCandidateListUIElement *, UINT, BSTR *);
+    HRESULT (STDMETHODCALLTYPE *GetPageIndex)(ITfCandidateListUIElement *, UINT *, UINT, UINT *);
+    HRESULT (STDMETHODCALLTYPE *SetPageIndex)(ITfCandidateListUIElement *, UINT *, UINT);
+    HRESULT (STDMETHODCALLTYPE *GetCurrentPage)(ITfCandidateListUIElement *, UINT *);
+} ITfCandidateListUIElementVtbl;
+
+struct ITfCandidateListUIElement
+{
+    const struct ITfCandidateListUIElementVtbl *lpVtbl;
+};
+
+typedef struct ITfReadingInformationUIElementVtbl
+{
+    HRESULT (STDMETHODCALLTYPE *QueryInterface)(ITfReadingInformationUIElement *, REFIID, void **);
+    ULONG (STDMETHODCALLTYPE *AddRef)(ITfReadingInformationUIElement *);
+    ULONG (STDMETHODCALLTYPE *Release)(ITfReadingInformationUIElement *);
+    HRESULT (STDMETHODCALLTYPE *GetDescription)(ITfReadingInformationUIElement *, BSTR *);
+    HRESULT (STDMETHODCALLTYPE *GetGUID)(ITfReadingInformationUIElement *, GUID *);
+    HRESULT (STDMETHODCALLTYPE *Show)(ITfReadingInformationUIElement *, BOOL);
+    HRESULT (STDMETHODCALLTYPE *IsShown)(ITfReadingInformationUIElement *, BOOL *);
+    HRESULT (STDMETHODCALLTYPE *GetUpdatedFlags)(ITfReadingInformationUIElement *, DWORD *);
+    HRESULT (STDMETHODCALLTYPE *GetContext)(ITfReadingInformationUIElement *, ITfContext **);
+    HRESULT (STDMETHODCALLTYPE *GetString)(ITfReadingInformationUIElement *, BSTR *);
+    HRESULT (STDMETHODCALLTYPE *GetMaxReadingStringLength)(ITfReadingInformationUIElement *, UINT *);
+    HRESULT (STDMETHODCALLTYPE *GetErrorIndex)(ITfReadingInformationUIElement *, UINT *);
+    HRESULT (STDMETHODCALLTYPE *IsVerticalOrderPreferred)(ITfReadingInformationUIElement *, BOOL *);
+} ITfReadingInformationUIElementVtbl;
+
+struct ITfReadingInformationUIElement
+{
+    const struct ITfReadingInformationUIElementVtbl *lpVtbl;
+};
+
+typedef struct ITfUIElementVtbl
+{
+    HRESULT (STDMETHODCALLTYPE *QueryInterface)(ITfUIElement *, REFIID, void **);
+    ULONG (STDMETHODCALLTYPE *AddRef)(ITfUIElement *);
+    ULONG (STDMETHODCALLTYPE *Release)(ITfUIElement *);
+    HRESULT (STDMETHODCALLTYPE *GetDescription)(ITfUIElement *, BSTR *);
+    HRESULT (STDMETHODCALLTYPE *GetGUID)(ITfUIElement *, GUID *);
+    HRESULT (STDMETHODCALLTYPE *Show)(ITfUIElement *, BOOL);
+    HRESULT (STDMETHODCALLTYPE *IsShown)(ITfUIElement *, BOOL *);
+} ITfUIElementVtbl;
+
+struct ITfUIElement
+{
+    const struct ITfUIElementVtbl *lpVtbl;
+};
+
+typedef struct ITfInputProcessorProfileActivationSinkVtbl
+{
+    HRESULT (STDMETHODCALLTYPE *QueryInterface)(ITfInputProcessorProfileActivationSink *, REFIID, void **);
+    ULONG (STDMETHODCALLTYPE *AddRef)(ITfInputProcessorProfileActivationSink *);
+    ULONG (STDMETHODCALLTYPE *Release)(ITfInputProcessorProfileActivationSink *);
+    HRESULT (STDMETHODCALLTYPE *OnActivated)(ITfInputProcessorProfileActivationSink *, DWORD, LANGID, REFCLSID, REFGUID, REFGUID, HKL, DWORD);
+
+} ITfInputProcessorProfileActivationSinkVtbl;
+
+struct ITfInputProcessorProfileActivationSink
+{
+    const struct ITfInputProcessorProfileActivationSinkVtbl *lpVtbl;
+};
+
+typedef struct ITfSourceVtbl
+{
+    HRESULT (STDMETHODCALLTYPE *QueryInterface)(ITfSource *, REFIID, void **);
+    ULONG (STDMETHODCALLTYPE *AddRef)(ITfSource *);
+    ULONG (STDMETHODCALLTYPE *Release)(ITfSource *);
+    HRESULT (STDMETHODCALLTYPE *AdviseSink)(ITfSource *, REFIID, IUnknown *, DWORD *);
+    HRESULT (STDMETHODCALLTYPE *UnadviseSink)(ITfSource *, DWORD);
+} ITfSourceVtbl;
+
+struct ITfSource
+{
+    const struct ITfSourceVtbl *lpVtbl;
+};
+
+#endif /* SDL_msctf_h_ */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_vkeys.h b/source/3rd-party/SDL2/src/video/windows/SDL_vkeys.h
new file mode 100644
index 0000000..a38e3a2
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_vkeys.h
@@ -0,0 +1,76 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef VK_0
+#define VK_0    '0'
+#define VK_1    '1'
+#define VK_2    '2'
+#define VK_3    '3'
+#define VK_4    '4'
+#define VK_5    '5'
+#define VK_6    '6'
+#define VK_7    '7'
+#define VK_8    '8'
+#define VK_9    '9'
+#define VK_A    'A'
+#define VK_B    'B'
+#define VK_C    'C'
+#define VK_D    'D'
+#define VK_E    'E'
+#define VK_F    'F'
+#define VK_G    'G'
+#define VK_H    'H'
+#define VK_I    'I'
+#define VK_J    'J'
+#define VK_K    'K'
+#define VK_L    'L'
+#define VK_M    'M'
+#define VK_N    'N'
+#define VK_O    'O'
+#define VK_P    'P'
+#define VK_Q    'Q'
+#define VK_R    'R'
+#define VK_S    'S'
+#define VK_T    'T'
+#define VK_U    'U'
+#define VK_V    'V'
+#define VK_W    'W'
+#define VK_X    'X'
+#define VK_Y    'Y'
+#define VK_Z    'Z'
+#endif /* VK_0 */
+
+/* These keys haven't been defined, but were experimentally determined */
+#define VK_SEMICOLON    0xBA
+#define VK_EQUALS       0xBB
+#define VK_COMMA        0xBC
+#define VK_MINUS        0xBD
+#define VK_PERIOD       0xBE
+#define VK_SLASH        0xBF
+#define VK_GRAVE        0xC0
+#define VK_LBRACKET     0xDB
+#define VK_BACKSLASH    0xDC
+#define VK_RBRACKET     0xDD
+#define VK_APOSTROPHE   0xDE
+#define VK_BACKTICK     0xDF
+#define VK_OEM_102      0xE2
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsclipboard.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowsclipboard.c
new file mode 100644
index 0000000..4e61d7a
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsclipboard.c
@@ -0,0 +1,160 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+#include "SDL_windowsvideo.h"
+#include "SDL_windowswindow.h"
+#include "../../events/SDL_clipboardevents_c.h"
+
+
+#ifdef UNICODE
+#define TEXT_FORMAT  CF_UNICODETEXT
+#else
+#define TEXT_FORMAT  CF_TEXT
+#endif
+
+
+/* Get any application owned window handle for clipboard association */
+static HWND
+GetWindowHandle(_THIS)
+{
+    SDL_Window *window;
+
+    window = _this->windows;
+    if (window) {
+        return ((SDL_WindowData *) window->driverdata)->hwnd;
+    }
+    return NULL;
+}
+
+int
+WIN_SetClipboardText(_THIS, const char *text)
+{
+    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
+    int result = 0;
+
+    if (OpenClipboard(GetWindowHandle(_this))) {
+        HANDLE hMem;
+        LPTSTR tstr;
+        SIZE_T i, size;
+
+        /* Convert the text from UTF-8 to Windows Unicode */
+        tstr = WIN_UTF8ToString(text);
+        if (!tstr) {
+            return -1;
+        }
+
+        /* Find out the size of the data */
+        for (size = 0, i = 0; tstr[i]; ++i, ++size) {
+            if (tstr[i] == '\n' && (i == 0 || tstr[i-1] != '\r')) {
+                /* We're going to insert a carriage return */
+                ++size;
+            }
+        }
+        size = (size+1)*sizeof(*tstr);
+
+        /* Save the data to the clipboard */
+        hMem = GlobalAlloc(GMEM_MOVEABLE, size);
+        if (hMem) {
+            LPTSTR dst = (LPTSTR)GlobalLock(hMem);
+            if (dst) {
+                /* Copy the text over, adding carriage returns as necessary */
+                for (i = 0; tstr[i]; ++i) {
+                    if (tstr[i] == '\n' && (i == 0 || tstr[i-1] != '\r')) {
+                        *dst++ = '\r';
+                    }
+                    *dst++ = tstr[i];
+                }
+                *dst = 0;
+                GlobalUnlock(hMem);
+            }
+
+            EmptyClipboard();
+            if (!SetClipboardData(TEXT_FORMAT, hMem)) {
+                result = WIN_SetError("Couldn't set clipboard data");
+            }
+            data->clipboard_count = GetClipboardSequenceNumber();
+        }
+        SDL_free(tstr);
+
+        CloseClipboard();
+    } else {
+        result = WIN_SetError("Couldn't open clipboard");
+    }
+    return result;
+}
+
+char *
+WIN_GetClipboardText(_THIS)
+{
+    char *text;
+
+    text = NULL;
+    if (IsClipboardFormatAvailable(TEXT_FORMAT) &&
+        OpenClipboard(GetWindowHandle(_this))) {
+        HANDLE hMem;
+        LPTSTR tstr;
+
+        hMem = GetClipboardData(TEXT_FORMAT);
+        if (hMem) {
+            tstr = (LPTSTR)GlobalLock(hMem);
+            text = WIN_StringToUTF8(tstr);
+            GlobalUnlock(hMem);
+        } else {
+            WIN_SetError("Couldn't get clipboard data");
+        }
+        CloseClipboard();
+    }
+    if (!text) {
+        text = SDL_strdup("");
+    }
+    return text;
+}
+
+SDL_bool
+WIN_HasClipboardText(_THIS)
+{
+    SDL_bool result = SDL_FALSE;
+    char *text = WIN_GetClipboardText(_this);
+    if (text) {
+        result = text[0] != '\0' ? SDL_TRUE : SDL_FALSE;
+        SDL_free(text);
+    }
+    return result;
+}
+
+void
+WIN_CheckClipboardUpdate(struct SDL_VideoData * data)
+{
+    const DWORD count = GetClipboardSequenceNumber();
+    if (count != data->clipboard_count) {
+        if (data->clipboard_count) {
+            SDL_SendClipboardUpdate();
+        }
+        data->clipboard_count = count;
+    }
+}
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsclipboard.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowsclipboard.h
new file mode 100644
index 0000000..937b7d0
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsclipboard.h
@@ -0,0 +1,36 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_windowsclipboard_h_
+#define SDL_windowsclipboard_h_
+
+/* Forward declaration */
+struct SDL_VideoData;
+
+extern int WIN_SetClipboardText(_THIS, const char *text);
+extern char *WIN_GetClipboardText(_THIS);
+extern SDL_bool WIN_HasClipboardText(_THIS);
+extern void WIN_CheckClipboardUpdate(struct SDL_VideoData * data);
+
+#endif /* SDL_windowsclipboard_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsevents.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowsevents.c
new file mode 100644
index 0000000..e961cf5
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsevents.c
@@ -0,0 +1,1236 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+#include "SDL_windowsvideo.h"
+#include "SDL_windowsshape.h"
+#include "SDL_system.h"
+#include "SDL_syswm.h"
+#include "SDL_timer.h"
+#include "SDL_vkeys.h"
+#include "SDL_hints.h"
+#include "../../events/SDL_events_c.h"
+#include "../../events/SDL_touch_c.h"
+#include "../../events/scancodes_windows.h"
+#include "SDL_assert.h"
+#include "SDL_hints.h"
+
+/* Dropfile support */
+#include <shellapi.h>
+
+/* For GET_X_LPARAM, GET_Y_LPARAM. */
+#include <windowsx.h>
+
+/* #define WMMSG_DEBUG */
+#ifdef WMMSG_DEBUG
+#include <stdio.h>
+#include "wmmsg.h"
+#endif
+
+/* For processing mouse WM_*BUTTON* and WM_MOUSEMOVE message-data from GetMessageExtraInfo() */
+#define MOUSEEVENTF_FROMTOUCH 0xFF515700
+
+/* Masks for processing the windows KEYDOWN and KEYUP messages */
+#define REPEATED_KEYMASK    (1<<30)
+#define EXTENDED_KEYMASK    (1<<24)
+
+#define VK_ENTER    10          /* Keypad Enter ... no VKEY defined? */
+#ifndef VK_OEM_NEC_EQUAL
+#define VK_OEM_NEC_EQUAL 0x92
+#endif
+
+/* Make sure XBUTTON stuff is defined that isn't in older Platform SDKs... */
+#ifndef WM_XBUTTONDOWN
+#define WM_XBUTTONDOWN 0x020B
+#endif
+#ifndef WM_XBUTTONUP
+#define WM_XBUTTONUP 0x020C
+#endif
+#ifndef GET_XBUTTON_WPARAM
+#define GET_XBUTTON_WPARAM(w) (HIWORD(w))
+#endif
+#ifndef WM_INPUT
+#define WM_INPUT 0x00ff
+#endif
+#ifndef WM_TOUCH
+#define WM_TOUCH 0x0240
+#endif
+#ifndef WM_MOUSEHWHEEL
+#define WM_MOUSEHWHEEL 0x020E
+#endif
+#ifndef WM_UNICHAR
+#define WM_UNICHAR 0x0109
+#endif
+
+static SDL_Scancode
+VKeytoScancode(WPARAM vkey)
+{
+    switch (vkey) {
+    case VK_CLEAR: return SDL_SCANCODE_CLEAR;
+    case VK_MODECHANGE: return SDL_SCANCODE_MODE;
+    case VK_SELECT: return SDL_SCANCODE_SELECT;
+    case VK_EXECUTE: return SDL_SCANCODE_EXECUTE;
+    case VK_HELP: return SDL_SCANCODE_HELP;
+    case VK_PAUSE: return SDL_SCANCODE_PAUSE;
+    case VK_NUMLOCK: return SDL_SCANCODE_NUMLOCKCLEAR;
+
+    case VK_F13: return SDL_SCANCODE_F13;
+    case VK_F14: return SDL_SCANCODE_F14;
+    case VK_F15: return SDL_SCANCODE_F15;
+    case VK_F16: return SDL_SCANCODE_F16;
+    case VK_F17: return SDL_SCANCODE_F17;
+    case VK_F18: return SDL_SCANCODE_F18;
+    case VK_F19: return SDL_SCANCODE_F19;
+    case VK_F20: return SDL_SCANCODE_F20;
+    case VK_F21: return SDL_SCANCODE_F21;
+    case VK_F22: return SDL_SCANCODE_F22;
+    case VK_F23: return SDL_SCANCODE_F23;
+    case VK_F24: return SDL_SCANCODE_F24;
+
+    case VK_OEM_NEC_EQUAL: return SDL_SCANCODE_KP_EQUALS;
+    case VK_BROWSER_BACK: return SDL_SCANCODE_AC_BACK;
+    case VK_BROWSER_FORWARD: return SDL_SCANCODE_AC_FORWARD;
+    case VK_BROWSER_REFRESH: return SDL_SCANCODE_AC_REFRESH;
+    case VK_BROWSER_STOP: return SDL_SCANCODE_AC_STOP;
+    case VK_BROWSER_SEARCH: return SDL_SCANCODE_AC_SEARCH;
+    case VK_BROWSER_FAVORITES: return SDL_SCANCODE_AC_BOOKMARKS;
+    case VK_BROWSER_HOME: return SDL_SCANCODE_AC_HOME;
+    case VK_VOLUME_MUTE: return SDL_SCANCODE_AUDIOMUTE;
+    case VK_VOLUME_DOWN: return SDL_SCANCODE_VOLUMEDOWN;
+    case VK_VOLUME_UP: return SDL_SCANCODE_VOLUMEUP;
+
+    case VK_MEDIA_NEXT_TRACK: return SDL_SCANCODE_AUDIONEXT;
+    case VK_MEDIA_PREV_TRACK: return SDL_SCANCODE_AUDIOPREV;
+    case VK_MEDIA_STOP: return SDL_SCANCODE_AUDIOSTOP;
+    case VK_MEDIA_PLAY_PAUSE: return SDL_SCANCODE_AUDIOPLAY;
+    case VK_LAUNCH_MAIL: return SDL_SCANCODE_MAIL;
+    case VK_LAUNCH_MEDIA_SELECT: return SDL_SCANCODE_MEDIASELECT;
+
+    case VK_OEM_102: return SDL_SCANCODE_NONUSBACKSLASH;
+
+    case VK_ATTN: return SDL_SCANCODE_SYSREQ;
+    case VK_CRSEL: return SDL_SCANCODE_CRSEL;
+    case VK_EXSEL: return SDL_SCANCODE_EXSEL;
+    case VK_OEM_CLEAR: return SDL_SCANCODE_CLEAR;
+
+    case VK_LAUNCH_APP1: return SDL_SCANCODE_APP1;
+    case VK_LAUNCH_APP2: return SDL_SCANCODE_APP2;
+
+    default: return SDL_SCANCODE_UNKNOWN;
+    }
+}
+
+static SDL_Scancode
+WindowsScanCodeToSDLScanCode(LPARAM lParam, WPARAM wParam)
+{
+    SDL_Scancode code;
+    int nScanCode = (lParam >> 16) & 0xFF;
+    SDL_bool bIsExtended = (lParam & (1 << 24)) != 0;
+
+    code = VKeytoScancode(wParam);
+
+    if (code == SDL_SCANCODE_UNKNOWN && nScanCode <= 127) {
+        code = windows_scancode_table[nScanCode];
+
+        if (bIsExtended) {
+            switch (code) {
+            case SDL_SCANCODE_RETURN:
+                code = SDL_SCANCODE_KP_ENTER;
+                break;
+            case SDL_SCANCODE_LALT:
+                code = SDL_SCANCODE_RALT;
+                break;
+            case SDL_SCANCODE_LCTRL:
+                code = SDL_SCANCODE_RCTRL;
+                break;
+            case SDL_SCANCODE_SLASH:
+                code = SDL_SCANCODE_KP_DIVIDE;
+                break;
+            case SDL_SCANCODE_CAPSLOCK:
+                code = SDL_SCANCODE_KP_PLUS;
+                break;
+            default:
+                break;
+            }
+        } else {
+            switch (code) {
+            case SDL_SCANCODE_HOME:
+                code = SDL_SCANCODE_KP_7;
+                break;
+            case SDL_SCANCODE_UP:
+                code = SDL_SCANCODE_KP_8;
+                break;
+            case SDL_SCANCODE_PAGEUP:
+                code = SDL_SCANCODE_KP_9;
+                break;
+            case SDL_SCANCODE_LEFT:
+                code = SDL_SCANCODE_KP_4;
+                break;
+            case SDL_SCANCODE_RIGHT:
+                code = SDL_SCANCODE_KP_6;
+                break;
+            case SDL_SCANCODE_END:
+                code = SDL_SCANCODE_KP_1;
+                break;
+            case SDL_SCANCODE_DOWN:
+                code = SDL_SCANCODE_KP_2;
+                break;
+            case SDL_SCANCODE_PAGEDOWN:
+                code = SDL_SCANCODE_KP_3;
+                break;
+            case SDL_SCANCODE_INSERT:
+                code = SDL_SCANCODE_KP_0;
+                break;
+            case SDL_SCANCODE_DELETE:
+                code = SDL_SCANCODE_KP_PERIOD;
+                break;
+            case SDL_SCANCODE_PRINTSCREEN:
+                code = SDL_SCANCODE_KP_MULTIPLY;
+                break;
+            default:
+                break;
+            }
+        }
+    }
+    return code;
+}
+
+static SDL_bool
+WIN_ShouldIgnoreFocusClick()
+{
+    return !SDL_GetHintBoolean(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, SDL_FALSE);
+}
+
+static void
+WIN_CheckWParamMouseButton(SDL_bool bwParamMousePressed, SDL_bool bSDLMousePressed, SDL_WindowData *data, Uint8 button, SDL_MouseID mouseID)
+{
+    if (data->focus_click_pending & SDL_BUTTON(button)) {
+        /* Ignore the button click for activation */
+        if (!bwParamMousePressed) {
+            data->focus_click_pending &= ~SDL_BUTTON(button);
+            WIN_UpdateClipCursor(data->window);
+        }
+        if (WIN_ShouldIgnoreFocusClick()) {
+            return;
+        }
+    }
+
+    if (bwParamMousePressed && !bSDLMousePressed) {
+        SDL_SendMouseButton(data->window, mouseID, SDL_PRESSED, button);
+    } else if (!bwParamMousePressed && bSDLMousePressed) {
+        SDL_SendMouseButton(data->window, mouseID, SDL_RELEASED, button);
+    }
+}
+
+/*
+* Some windows systems fail to send a WM_LBUTTONDOWN sometimes, but each mouse move contains the current button state also
+*  so this funciton reconciles our view of the world with the current buttons reported by windows
+*/
+static void
+WIN_CheckWParamMouseButtons(WPARAM wParam, SDL_WindowData *data, SDL_MouseID mouseID)
+{
+    if (wParam != data->mouse_button_flags) {
+        Uint32 mouseFlags = SDL_GetMouseState(NULL, NULL);
+        WIN_CheckWParamMouseButton((wParam & MK_LBUTTON), (mouseFlags & SDL_BUTTON_LMASK), data, SDL_BUTTON_LEFT, mouseID);
+        WIN_CheckWParamMouseButton((wParam & MK_MBUTTON), (mouseFlags & SDL_BUTTON_MMASK), data, SDL_BUTTON_MIDDLE, mouseID);
+        WIN_CheckWParamMouseButton((wParam & MK_RBUTTON), (mouseFlags & SDL_BUTTON_RMASK), data, SDL_BUTTON_RIGHT, mouseID);
+        WIN_CheckWParamMouseButton((wParam & MK_XBUTTON1), (mouseFlags & SDL_BUTTON_X1MASK), data, SDL_BUTTON_X1, mouseID);
+        WIN_CheckWParamMouseButton((wParam & MK_XBUTTON2), (mouseFlags & SDL_BUTTON_X2MASK), data, SDL_BUTTON_X2, mouseID);
+        data->mouse_button_flags = wParam;
+    }
+}
+
+
+static void
+WIN_CheckRawMouseButtons(ULONG rawButtons, SDL_WindowData *data)
+{
+    if (rawButtons != data->mouse_button_flags) {
+        Uint32 mouseFlags = SDL_GetMouseState(NULL, NULL);
+        if ((rawButtons & RI_MOUSE_BUTTON_1_DOWN))
+            WIN_CheckWParamMouseButton((rawButtons & RI_MOUSE_BUTTON_1_DOWN), (mouseFlags & SDL_BUTTON_LMASK), data, SDL_BUTTON_LEFT, 0);
+        if ((rawButtons & RI_MOUSE_BUTTON_1_UP))
+            WIN_CheckWParamMouseButton(!(rawButtons & RI_MOUSE_BUTTON_1_UP), (mouseFlags & SDL_BUTTON_LMASK), data, SDL_BUTTON_LEFT, 0);
+        if ((rawButtons & RI_MOUSE_BUTTON_2_DOWN))
+            WIN_CheckWParamMouseButton((rawButtons & RI_MOUSE_BUTTON_2_DOWN), (mouseFlags & SDL_BUTTON_RMASK), data, SDL_BUTTON_RIGHT, 0);
+        if ((rawButtons & RI_MOUSE_BUTTON_2_UP))
+            WIN_CheckWParamMouseButton(!(rawButtons & RI_MOUSE_BUTTON_2_UP), (mouseFlags & SDL_BUTTON_RMASK), data, SDL_BUTTON_RIGHT, 0);
+        if ((rawButtons & RI_MOUSE_BUTTON_3_DOWN))
+            WIN_CheckWParamMouseButton((rawButtons & RI_MOUSE_BUTTON_3_DOWN), (mouseFlags & SDL_BUTTON_MMASK), data, SDL_BUTTON_MIDDLE, 0);
+        if ((rawButtons & RI_MOUSE_BUTTON_3_UP))
+            WIN_CheckWParamMouseButton(!(rawButtons & RI_MOUSE_BUTTON_3_UP), (mouseFlags & SDL_BUTTON_MMASK), data, SDL_BUTTON_MIDDLE, 0);
+        if ((rawButtons & RI_MOUSE_BUTTON_4_DOWN))
+            WIN_CheckWParamMouseButton((rawButtons & RI_MOUSE_BUTTON_4_DOWN), (mouseFlags & SDL_BUTTON_X1MASK), data, SDL_BUTTON_X1, 0);
+        if ((rawButtons & RI_MOUSE_BUTTON_4_UP))
+            WIN_CheckWParamMouseButton(!(rawButtons & RI_MOUSE_BUTTON_4_UP), (mouseFlags & SDL_BUTTON_X1MASK), data, SDL_BUTTON_X1, 0);
+        if ((rawButtons & RI_MOUSE_BUTTON_5_DOWN))
+            WIN_CheckWParamMouseButton((rawButtons & RI_MOUSE_BUTTON_5_DOWN), (mouseFlags & SDL_BUTTON_X2MASK), data, SDL_BUTTON_X2, 0);
+        if ((rawButtons & RI_MOUSE_BUTTON_5_UP))
+            WIN_CheckWParamMouseButton(!(rawButtons & RI_MOUSE_BUTTON_5_UP), (mouseFlags & SDL_BUTTON_X2MASK), data, SDL_BUTTON_X2, 0);
+        data->mouse_button_flags = rawButtons;
+    }
+}
+
+static void
+WIN_CheckAsyncMouseRelease(SDL_WindowData *data)
+{
+    Uint32 mouseFlags;
+    SHORT keyState;
+
+    /* mouse buttons may have changed state here, we need to resync them,
+       but we will get a WM_MOUSEMOVE right away which will fix things up if in non raw mode also
+    */
+    mouseFlags = SDL_GetMouseState(NULL, NULL);
+
+    keyState = GetAsyncKeyState(VK_LBUTTON);
+    if (!(keyState & 0x8000)) {
+        WIN_CheckWParamMouseButton(SDL_FALSE, (mouseFlags & SDL_BUTTON_LMASK), data, SDL_BUTTON_LEFT, 0);
+    }
+    keyState = GetAsyncKeyState(VK_RBUTTON);
+    if (!(keyState & 0x8000)) {
+        WIN_CheckWParamMouseButton(SDL_FALSE, (mouseFlags & SDL_BUTTON_RMASK), data, SDL_BUTTON_RIGHT, 0);
+    }
+    keyState = GetAsyncKeyState(VK_MBUTTON);
+    if (!(keyState & 0x8000)) {
+        WIN_CheckWParamMouseButton(SDL_FALSE, (mouseFlags & SDL_BUTTON_MMASK), data, SDL_BUTTON_MIDDLE, 0);
+    }
+    keyState = GetAsyncKeyState(VK_XBUTTON1);
+    if (!(keyState & 0x8000)) {
+        WIN_CheckWParamMouseButton(SDL_FALSE, (mouseFlags & SDL_BUTTON_X1MASK), data, SDL_BUTTON_X1, 0);
+    }
+    keyState = GetAsyncKeyState(VK_XBUTTON2);
+    if (!(keyState & 0x8000)) {
+        WIN_CheckWParamMouseButton(SDL_FALSE, (mouseFlags & SDL_BUTTON_X2MASK), data, SDL_BUTTON_X2, 0);
+    }
+    data->mouse_button_flags = 0;
+}
+
+static BOOL
+WIN_ConvertUTF32toUTF8(UINT32 codepoint, char * text)
+{
+    if (codepoint <= 0x7F) {
+        text[0] = (char) codepoint;
+        text[1] = '\0';
+    } else if (codepoint <= 0x7FF) {
+        text[0] = 0xC0 | (char) ((codepoint >> 6) & 0x1F);
+        text[1] = 0x80 | (char) (codepoint & 0x3F);
+        text[2] = '\0';
+    } else if (codepoint <= 0xFFFF) {
+        text[0] = 0xE0 | (char) ((codepoint >> 12) & 0x0F);
+        text[1] = 0x80 | (char) ((codepoint >> 6) & 0x3F);
+        text[2] = 0x80 | (char) (codepoint & 0x3F);
+        text[3] = '\0';
+    } else if (codepoint <= 0x10FFFF) {
+        text[0] = 0xF0 | (char) ((codepoint >> 18) & 0x0F);
+        text[1] = 0x80 | (char) ((codepoint >> 12) & 0x3F);
+        text[2] = 0x80 | (char) ((codepoint >> 6) & 0x3F);
+        text[3] = 0x80 | (char) (codepoint & 0x3F);
+        text[4] = '\0';
+    } else {
+        return SDL_FALSE;
+    }
+    return SDL_TRUE;
+}
+
+static SDL_bool
+ShouldGenerateWindowCloseOnAltF4(void)
+{
+    return !SDL_GetHintBoolean(SDL_HINT_WINDOWS_NO_CLOSE_ON_ALT_F4, SDL_FALSE);
+}
+
+/* Win10 "Fall Creators Update" introduced the bug that SetCursorPos() (as used by SDL_WarpMouseInWindow())
+   doesn't reliably generate WM_MOUSEMOVE events anymore (see #3931) which breaks relative mouse mode via warping.
+   This is used to implement a workaround.. */
+static SDL_bool isWin10FCUorNewer = SDL_FALSE;
+
+LRESULT CALLBACK
+WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
+{
+    SDL_WindowData *data;
+    LRESULT returnCode = -1;
+
+    /* Send a SDL_SYSWMEVENT if the application wants them */
+    if (SDL_GetEventState(SDL_SYSWMEVENT) == SDL_ENABLE) {
+        SDL_SysWMmsg wmmsg;
+
+        SDL_VERSION(&wmmsg.version);
+        wmmsg.subsystem = SDL_SYSWM_WINDOWS;
+        wmmsg.msg.win.hwnd = hwnd;
+        wmmsg.msg.win.msg = msg;
+        wmmsg.msg.win.wParam = wParam;
+        wmmsg.msg.win.lParam = lParam;
+        SDL_SendSysWMEvent(&wmmsg);
+    }
+
+    /* Get the window data for the window */
+    data = (SDL_WindowData *) GetProp(hwnd, TEXT("SDL_WindowData"));
+    if (!data) {
+        return CallWindowProc(DefWindowProc, hwnd, msg, wParam, lParam);
+    }
+
+#ifdef WMMSG_DEBUG
+    {
+        char message[1024];
+        if (msg > MAX_WMMSG) {
+            SDL_snprintf(message, sizeof(message), "Received windows message: %p UNKNOWN (%d) -- 0x%X, 0x%X\n", hwnd, msg, wParam, lParam);
+        } else {
+            SDL_snprintf(message, sizeof(message), "Received windows message: %p %s -- 0x%X, 0x%X\n", hwnd, wmtab[msg], wParam, lParam);
+        }
+        OutputDebugStringA(message);
+    }
+#endif /* WMMSG_DEBUG */
+
+    if (IME_HandleMessage(hwnd, msg, wParam, &lParam, data->videodata))
+        return 0;
+
+    switch (msg) {
+
+    case WM_SHOWWINDOW:
+        {
+            if (wParam) {
+                SDL_SendWindowEvent(data->window, SDL_WINDOWEVENT_SHOWN, 0, 0);
+            } else {
+                SDL_SendWindowEvent(data->window, SDL_WINDOWEVENT_HIDDEN, 0, 0);
+            }
+        }
+        break;
+
+    case WM_NCACTIVATE:
+        {
+            /* Don't immediately clip the cursor in case we're clicking minimize/maximize buttons */
+            data->skip_update_clipcursor = SDL_TRUE;
+        }
+        break;
+
+    case WM_ACTIVATE:
+        {
+            POINT cursorPos;
+            BOOL minimized;
+
+            /* Don't mark the window as shown if it's activated before being shown */
+            if (!IsWindowVisible(hwnd)) {
+                break;
+            }
+
+            minimized = HIWORD(wParam);
+            if (!minimized && (LOWORD(wParam) != WA_INACTIVE)) {
+                if (LOWORD(wParam) == WA_CLICKACTIVE) {
+                    if (GetAsyncKeyState(VK_LBUTTON)) {
+                        data->focus_click_pending |= SDL_BUTTON_LMASK;
+                    }
+                    if (GetAsyncKeyState(VK_RBUTTON)) {
+                        data->focus_click_pending |= SDL_BUTTON_RMASK;
+                    }
+                    if (GetAsyncKeyState(VK_MBUTTON)) {
+                        data->focus_click_pending |= SDL_BUTTON_MMASK;
+                    }
+                    if (GetAsyncKeyState(VK_XBUTTON1)) {
+                        data->focus_click_pending |= SDL_BUTTON_X1MASK;
+                    }
+                    if (GetAsyncKeyState(VK_XBUTTON2)) {
+                        data->focus_click_pending |= SDL_BUTTON_X2MASK;
+                    }
+                }
+                
+                SDL_SendWindowEvent(data->window, SDL_WINDOWEVENT_SHOWN, 0, 0);
+                if (SDL_GetKeyboardFocus() != data->window) {
+                    SDL_SetKeyboardFocus(data->window);
+                }
+
+                GetCursorPos(&cursorPos);
+                ScreenToClient(hwnd, &cursorPos);
+                SDL_SendMouseMotion(data->window, 0, 0, cursorPos.x, cursorPos.y);
+
+                WIN_CheckAsyncMouseRelease(data);
+
+                /*
+                 * FIXME: Update keyboard state
+                 */
+                WIN_CheckClipboardUpdate(data->videodata);
+
+                SDL_ToggleModState(KMOD_CAPS, (GetKeyState(VK_CAPITAL) & 0x0001) != 0);
+                SDL_ToggleModState(KMOD_NUM, (GetKeyState(VK_NUMLOCK) & 0x0001) != 0);
+            } else {
+                RECT rect;
+
+                data->in_window_deactivation = SDL_TRUE;
+
+                if (SDL_GetKeyboardFocus() == data->window) {
+                    SDL_SetKeyboardFocus(NULL);
+                    WIN_ResetDeadKeys();
+                }
+
+                if (GetClipCursor(&rect) && SDL_memcmp(&rect, &data->cursor_clipped_rect, sizeof(rect) == 0)) {
+                    ClipCursor(NULL);
+                    SDL_zero(data->cursor_clipped_rect);
+                }
+
+                data->in_window_deactivation = SDL_FALSE;
+            }
+        }
+        returnCode = 0;
+        break;
+
+    case WM_MOUSEMOVE:
+        {
+            SDL_Mouse *mouse = SDL_GetMouse();
+            if (!mouse->relative_mode || mouse->relative_mode_warp) {
+                SDL_MouseID mouseID = (((GetMessageExtraInfo() & MOUSEEVENTF_FROMTOUCH) == MOUSEEVENTF_FROMTOUCH) ? SDL_TOUCH_MOUSEID : 0);
+                SDL_SendMouseMotion(data->window, mouseID, 0, GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
+                if (isWin10FCUorNewer && mouseID != SDL_TOUCH_MOUSEID && mouse->relative_mode_warp) {
+                    /* To work around #3931, Win10 bug introduced in Fall Creators Update, where
+                       SetCursorPos() (SDL_WarpMouseInWindow()) doesn't reliably generate mouse events anymore,
+                       after each windows mouse event generate a fake event for the middle of the window
+                       if relative_mode_warp is used */
+                    int center_x = 0, center_y = 0;
+                    SDL_GetWindowSize(data->window, &center_x, &center_y);
+                    center_x /= 2;
+                    center_y /= 2;
+                    SDL_SendMouseMotion(data->window, mouseID, 0, center_x, center_y);
+                }
+            }
+        }
+        /* don't break here, fall through to check the wParam like the button presses */
+    case WM_LBUTTONUP:
+    case WM_RBUTTONUP:
+    case WM_MBUTTONUP:
+    case WM_XBUTTONUP:
+    case WM_LBUTTONDOWN:
+    case WM_LBUTTONDBLCLK:
+    case WM_RBUTTONDOWN:
+    case WM_RBUTTONDBLCLK:
+    case WM_MBUTTONDOWN:
+    case WM_MBUTTONDBLCLK:
+    case WM_XBUTTONDOWN:
+    case WM_XBUTTONDBLCLK:
+        {
+            SDL_Mouse *mouse = SDL_GetMouse();
+            if (!mouse->relative_mode || mouse->relative_mode_warp) {
+                SDL_MouseID mouseID = (((GetMessageExtraInfo() & MOUSEEVENTF_FROMTOUCH) == MOUSEEVENTF_FROMTOUCH) ? SDL_TOUCH_MOUSEID : 0);
+                WIN_CheckWParamMouseButtons(wParam, data, mouseID);
+            }
+        }
+        break;
+
+    case WM_INPUT:
+        {
+            SDL_Mouse *mouse = SDL_GetMouse();
+            HRAWINPUT hRawInput = (HRAWINPUT)lParam;
+            RAWINPUT inp;
+            UINT size = sizeof(inp);
+            const SDL_bool isRelative = mouse->relative_mode || mouse->relative_mode_warp;
+            const SDL_bool isCapture = ((data->window->flags & SDL_WINDOW_MOUSE_CAPTURE) != 0);
+
+            if (!isRelative || mouse->focus != data->window) {
+                if (!isCapture) {
+                    break;
+                }
+            }
+
+            GetRawInputData(hRawInput, RID_INPUT, &inp, &size, sizeof(RAWINPUTHEADER));
+
+            /* Mouse data */
+            if (inp.header.dwType == RIM_TYPEMOUSE) {
+                if (isRelative) {
+                    RAWMOUSE* rawmouse = &inp.data.mouse;
+
+                    if ((rawmouse->usFlags & 0x01) == MOUSE_MOVE_RELATIVE) {
+                        SDL_SendMouseMotion(data->window, 0, 1, (int)rawmouse->lLastX, (int)rawmouse->lLastY);
+                    } else {
+                        /* synthesize relative moves from the abs position */
+                        static SDL_Point initialMousePoint;
+                        if (initialMousePoint.x == 0 && initialMousePoint.y == 0) {
+                            initialMousePoint.x = rawmouse->lLastX;
+                            initialMousePoint.y = rawmouse->lLastY;
+                        }
+
+                        SDL_SendMouseMotion(data->window, 0, 1, (int)(rawmouse->lLastX-initialMousePoint.x), (int)(rawmouse->lLastY-initialMousePoint.y));
+
+                        initialMousePoint.x = rawmouse->lLastX;
+                        initialMousePoint.y = rawmouse->lLastY;
+                    }
+                    WIN_CheckRawMouseButtons(rawmouse->usButtonFlags, data);
+                } else if (isCapture) {
+                    /* we check for where Windows thinks the system cursor lives in this case, so we don't really lose mouse accel, etc. */
+                    POINT pt;
+                    RECT hwndRect;
+                    HWND currentHnd;
+
+                    GetCursorPos(&pt);
+                    currentHnd = WindowFromPoint(pt);
+                    ScreenToClient(hwnd, &pt);
+                    GetClientRect(hwnd, &hwndRect);
+
+                    /* if in the window, WM_MOUSEMOVE, etc, will cover it. */
+                    if(currentHnd != hwnd || pt.x < 0 || pt.y < 0 || pt.x > hwndRect.right || pt.y > hwndRect.right) {
+                        SDL_SendMouseMotion(data->window, 0, 0, (int)pt.x, (int)pt.y);
+                        SDL_SendMouseButton(data->window, 0, GetAsyncKeyState(VK_LBUTTON) & 0x8000 ? SDL_PRESSED : SDL_RELEASED, SDL_BUTTON_LEFT);
+                        SDL_SendMouseButton(data->window, 0, GetAsyncKeyState(VK_RBUTTON) & 0x8000 ? SDL_PRESSED : SDL_RELEASED, SDL_BUTTON_RIGHT);
+                        SDL_SendMouseButton(data->window, 0, GetAsyncKeyState(VK_MBUTTON) & 0x8000 ? SDL_PRESSED : SDL_RELEASED, SDL_BUTTON_MIDDLE);
+                        SDL_SendMouseButton(data->window, 0, GetAsyncKeyState(VK_XBUTTON1) & 0x8000 ? SDL_PRESSED : SDL_RELEASED, SDL_BUTTON_X1);
+                        SDL_SendMouseButton(data->window, 0, GetAsyncKeyState(VK_XBUTTON2) & 0x8000 ? SDL_PRESSED : SDL_RELEASED, SDL_BUTTON_X2);
+                    }
+                } else {
+                    SDL_assert(0 && "Shouldn't happen");
+                }
+            }
+        }
+        break;
+
+    case WM_MOUSEWHEEL:
+    case WM_MOUSEHWHEEL:
+        {
+            short amount = GET_WHEEL_DELTA_WPARAM(wParam);
+            float fAmount = (float) amount / WHEEL_DELTA;
+            if (msg == WM_MOUSEWHEEL)
+                SDL_SendMouseWheel(data->window, 0, 0.0f, fAmount, SDL_MOUSEWHEEL_NORMAL);
+            else
+                SDL_SendMouseWheel(data->window, 0, fAmount, 0.0f, SDL_MOUSEWHEEL_NORMAL);
+        }
+        break;
+
+#ifdef WM_MOUSELEAVE
+    case WM_MOUSELEAVE:
+        if (SDL_GetMouseFocus() == data->window && !SDL_GetMouse()->relative_mode && !(data->window->flags & SDL_WINDOW_MOUSE_CAPTURE)) {
+            if (!IsIconic(hwnd)) {
+                POINT cursorPos;
+                GetCursorPos(&cursorPos);
+                ScreenToClient(hwnd, &cursorPos);
+                SDL_SendMouseMotion(data->window, 0, 0, cursorPos.x, cursorPos.y);
+            }
+            SDL_SetMouseFocus(NULL);
+        }
+        returnCode = 0;
+        break;
+#endif /* WM_MOUSELEAVE */
+
+    case WM_KEYDOWN:
+    case WM_SYSKEYDOWN:
+        {
+            SDL_Scancode code = WindowsScanCodeToSDLScanCode(lParam, wParam);
+            const Uint8 *keyboardState = SDL_GetKeyboardState(NULL);
+
+            /* Detect relevant keyboard shortcuts */
+            if (keyboardState[SDL_SCANCODE_LALT] == SDL_PRESSED || keyboardState[SDL_SCANCODE_RALT] == SDL_PRESSED) {
+                /* ALT+F4: Close window */
+                if (code == SDL_SCANCODE_F4 && ShouldGenerateWindowCloseOnAltF4()) {
+                    SDL_SendWindowEvent(data->window, SDL_WINDOWEVENT_CLOSE, 0, 0);
+                }
+            }
+
+            if (code != SDL_SCANCODE_UNKNOWN) {
+                SDL_SendKeyboardKey(SDL_PRESSED, code);
+            }
+        }
+
+        returnCode = 0;
+        break;
+
+    case WM_SYSKEYUP:
+    case WM_KEYUP:
+        {
+            SDL_Scancode code = WindowsScanCodeToSDLScanCode(lParam, wParam);
+            const Uint8 *keyboardState = SDL_GetKeyboardState(NULL);
+
+            if (code != SDL_SCANCODE_UNKNOWN) {
+                if (code == SDL_SCANCODE_PRINTSCREEN &&
+                    keyboardState[code] == SDL_RELEASED) {
+                    SDL_SendKeyboardKey(SDL_PRESSED, code);
+                }
+                SDL_SendKeyboardKey(SDL_RELEASED, code);
+            }
+        }
+        returnCode = 0;
+        break;
+
+    case WM_UNICHAR:
+        if (wParam == UNICODE_NOCHAR) {
+            returnCode = 1;
+            break;
+        }
+        /* otherwise fall through to below */
+    case WM_CHAR:
+        {
+            char text[5];
+            if (WIN_ConvertUTF32toUTF8((UINT32)wParam, text)) {
+                SDL_SendKeyboardText(text);
+            }
+        }
+        returnCode = 0;
+        break;
+
+#ifdef WM_INPUTLANGCHANGE
+    case WM_INPUTLANGCHANGE:
+        {
+            WIN_UpdateKeymap();
+            SDL_SendKeymapChangedEvent();
+        }
+        returnCode = 1;
+        break;
+#endif /* WM_INPUTLANGCHANGE */
+
+    case WM_NCLBUTTONDOWN:
+        {
+            data->in_title_click = SDL_TRUE;
+        }
+        break;
+
+    case WM_CAPTURECHANGED:
+        {
+            data->in_title_click = SDL_FALSE;
+
+            /* The mouse may have been released during a modal loop */
+            WIN_CheckAsyncMouseRelease(data);
+        }
+        break;
+
+#ifdef WM_GETMINMAXINFO
+    case WM_GETMINMAXINFO:
+        {
+            MINMAXINFO *info;
+            RECT size;
+            int x, y;
+            int w, h;
+            int min_w, min_h;
+            int max_w, max_h;
+            BOOL constrain_max_size;
+
+            if (SDL_IsShapedWindow(data->window))
+                Win32_ResizeWindowShape(data->window);
+
+            /* If this is an expected size change, allow it */
+            if (data->expected_resize) {
+                break;
+            }
+
+            /* Get the current position of our window */
+            GetWindowRect(hwnd, &size);
+            x = size.left;
+            y = size.top;
+
+            /* Calculate current size of our window */
+            SDL_GetWindowSize(data->window, &w, &h);
+            SDL_GetWindowMinimumSize(data->window, &min_w, &min_h);
+            SDL_GetWindowMaximumSize(data->window, &max_w, &max_h);
+
+            /* Store in min_w and min_h difference between current size and minimal
+               size so we don't need to call AdjustWindowRectEx twice */
+            min_w -= w;
+            min_h -= h;
+            if (max_w && max_h) {
+                max_w -= w;
+                max_h -= h;
+                constrain_max_size = TRUE;
+            } else {
+                constrain_max_size = FALSE;
+            }
+
+            if (!(SDL_GetWindowFlags(data->window) & SDL_WINDOW_BORDERLESS)) {
+                LONG style = GetWindowLong(hwnd, GWL_STYLE);
+                /* DJM - according to the docs for GetMenu(), the
+                   return value is undefined if hwnd is a child window.
+                   Apparently it's too difficult for MS to check
+                   inside their function, so I have to do it here.
+                 */
+                BOOL menu = (style & WS_CHILDWINDOW) ? FALSE : (GetMenu(hwnd) != NULL);
+                size.top = 0;
+                size.left = 0;
+                size.bottom = h;
+                size.right = w;
+
+                AdjustWindowRectEx(&size, style, menu, 0);
+                w = size.right - size.left;
+                h = size.bottom - size.top;
+            }
+
+            /* Fix our size to the current size */
+            info = (MINMAXINFO *) lParam;
+            if (SDL_GetWindowFlags(data->window) & SDL_WINDOW_RESIZABLE) {
+                info->ptMinTrackSize.x = w + min_w;
+                info->ptMinTrackSize.y = h + min_h;
+                if (constrain_max_size) {
+                    info->ptMaxTrackSize.x = w + max_w;
+                    info->ptMaxTrackSize.y = h + max_h;
+                }
+            } else {
+                info->ptMaxSize.x = w;
+                info->ptMaxSize.y = h;
+                info->ptMaxPosition.x = x;
+                info->ptMaxPosition.y = y;
+                info->ptMinTrackSize.x = w;
+                info->ptMinTrackSize.y = h;
+                info->ptMaxTrackSize.x = w;
+                info->ptMaxTrackSize.y = h;
+            }
+        }
+        returnCode = 0;
+        break;
+#endif /* WM_GETMINMAXINFO */
+
+    case WM_WINDOWPOSCHANGING:
+
+        if (data->expected_resize) {
+            returnCode = 0;
+        }
+        break;
+
+    case WM_WINDOWPOSCHANGED:
+        {
+            RECT rect;
+            int x, y;
+            int w, h;
+
+            if (data->initializing || data->in_border_change) {
+                break;
+            }
+
+            if (!GetClientRect(hwnd, &rect) || IsRectEmpty(&rect)) {
+                break;
+            }
+            ClientToScreen(hwnd, (LPPOINT) & rect);
+            ClientToScreen(hwnd, (LPPOINT) & rect + 1);
+
+            WIN_UpdateClipCursor(data->window);
+
+            x = rect.left;
+            y = rect.top;
+            SDL_SendWindowEvent(data->window, SDL_WINDOWEVENT_MOVED, x, y);
+
+            w = rect.right - rect.left;
+            h = rect.bottom - rect.top;
+            SDL_SendWindowEvent(data->window, SDL_WINDOWEVENT_RESIZED, w,
+                                h);
+
+            /* Forces a WM_PAINT event */
+            InvalidateRect(hwnd, NULL, FALSE);
+        }
+        break;
+
+    case WM_SIZE:
+        {
+            switch (wParam) {
+            case SIZE_MAXIMIZED:
+                SDL_SendWindowEvent(data->window,
+                    SDL_WINDOWEVENT_RESTORED, 0, 0);
+                SDL_SendWindowEvent(data->window,
+                    SDL_WINDOWEVENT_MAXIMIZED, 0, 0);
+                break;
+            case SIZE_MINIMIZED:
+                SDL_SendWindowEvent(data->window,
+                    SDL_WINDOWEVENT_MINIMIZED, 0, 0);
+                break;
+            default:
+                SDL_SendWindowEvent(data->window,
+                    SDL_WINDOWEVENT_RESTORED, 0, 0);
+                break;
+            }
+        }
+        break;
+
+    case WM_SETCURSOR:
+        {
+            Uint16 hittest;
+
+            hittest = LOWORD(lParam);
+            if (hittest == HTCLIENT) {
+                SetCursor(SDL_cursor);
+                returnCode = TRUE;
+            } else if (!g_WindowFrameUsableWhileCursorHidden && !SDL_cursor) {
+                SetCursor(NULL);
+                returnCode = TRUE;
+            }
+        }
+        break;
+
+        /* We were occluded, refresh our display */
+    case WM_PAINT:
+        {
+            RECT rect;
+            if (GetUpdateRect(hwnd, &rect, FALSE)) {
+                ValidateRect(hwnd, NULL);
+                SDL_SendWindowEvent(data->window, SDL_WINDOWEVENT_EXPOSED,
+                                    0, 0);
+            }
+        }
+        returnCode = 0;
+        break;
+
+        /* We'll do our own drawing, prevent flicker */
+    case WM_ERASEBKGND:
+        {
+        }
+        return (1);
+
+    case WM_SYSCOMMAND:
+        {
+            if ((wParam & 0xFFF0) == SC_KEYMENU) {
+                return (0);
+            }
+
+#if defined(SC_SCREENSAVE) || defined(SC_MONITORPOWER)
+            /* Don't start the screensaver or blank the monitor in fullscreen apps */
+            if ((wParam & 0xFFF0) == SC_SCREENSAVE ||
+                (wParam & 0xFFF0) == SC_MONITORPOWER) {
+                if (SDL_GetVideoDevice()->suspend_screensaver) {
+                    return (0);
+                }
+            }
+#endif /* System has screensaver support */
+        }
+        break;
+
+    case WM_CLOSE:
+        {
+            SDL_SendWindowEvent(data->window, SDL_WINDOWEVENT_CLOSE, 0, 0);
+        }
+        returnCode = 0;
+        break;
+
+    case WM_TOUCH:
+        if (data->videodata->GetTouchInputInfo && data->videodata->CloseTouchInputHandle) {
+            UINT i, num_inputs = LOWORD(wParam);
+            PTOUCHINPUT inputs = SDL_stack_alloc(TOUCHINPUT, num_inputs);
+            if (data->videodata->GetTouchInputInfo((HTOUCHINPUT)lParam, num_inputs, inputs, sizeof(TOUCHINPUT))) {
+                RECT rect;
+                float x, y;
+
+                if (!GetClientRect(hwnd, &rect) ||
+                    (rect.right == rect.left && rect.bottom == rect.top)) {
+                    if (inputs) {
+                        SDL_stack_free(inputs);
+                    }
+                    break;
+                }
+                ClientToScreen(hwnd, (LPPOINT) & rect);
+                ClientToScreen(hwnd, (LPPOINT) & rect + 1);
+                rect.top *= 100;
+                rect.left *= 100;
+                rect.bottom *= 100;
+                rect.right *= 100;
+
+                for (i = 0; i < num_inputs; ++i) {
+                    PTOUCHINPUT input = &inputs[i];
+
+                    const SDL_TouchID touchId = (SDL_TouchID)((size_t)input->hSource);
+                    if (SDL_AddTouch(touchId, "") < 0) {
+                        continue;
+                    }
+
+                    /* Get the normalized coordinates for the window */
+                    x = (float)(input->x - rect.left)/(rect.right - rect.left);
+                    y = (float)(input->y - rect.top)/(rect.bottom - rect.top);
+
+                    if (input->dwFlags & TOUCHEVENTF_DOWN) {
+                        SDL_SendTouch(touchId, input->dwID, SDL_TRUE, x, y, 1.0f);
+                    }
+                    if (input->dwFlags & TOUCHEVENTF_MOVE) {
+                        SDL_SendTouchMotion(touchId, input->dwID, x, y, 1.0f);
+                    }
+                    if (input->dwFlags & TOUCHEVENTF_UP) {
+                        SDL_SendTouch(touchId, input->dwID, SDL_FALSE, x, y, 1.0f);
+                    }
+                }
+            }
+            SDL_stack_free(inputs);
+
+            data->videodata->CloseTouchInputHandle((HTOUCHINPUT)lParam);
+            return 0;
+        }
+        break;
+
+    case WM_DROPFILES:
+        {
+            UINT i;
+            HDROP drop = (HDROP) wParam;
+            UINT count = DragQueryFile(drop, 0xFFFFFFFF, NULL, 0);
+            for (i = 0; i < count; ++i) {
+                UINT size = DragQueryFile(drop, i, NULL, 0) + 1;
+                LPTSTR buffer = SDL_stack_alloc(TCHAR, size);
+                if (buffer) {
+                    if (DragQueryFile(drop, i, buffer, size)) {
+                        char *file = WIN_StringToUTF8(buffer);
+                        SDL_SendDropFile(data->window, file);
+                        SDL_free(file);
+                    }
+                    SDL_stack_free(buffer);
+                }
+            }
+            SDL_SendDropComplete(data->window);
+            DragFinish(drop);
+            return 0;
+        }
+        break;
+
+    case WM_NCCALCSIZE:
+        {
+            Uint32 window_flags = SDL_GetWindowFlags(data->window);
+            if (wParam == TRUE && (window_flags & SDL_WINDOW_BORDERLESS) && !(window_flags & SDL_WINDOW_FULLSCREEN)) {
+                /* When borderless, need to tell windows that the size of the non-client area is 0 */
+                if (!(window_flags & SDL_WINDOW_RESIZABLE)) {
+                    int w, h;
+                    NCCALCSIZE_PARAMS *params = (NCCALCSIZE_PARAMS *)lParam;
+                    w = data->window->windowed.w;
+                    h = data->window->windowed.h;
+                    params->rgrc[0].right = params->rgrc[0].left + w;
+                    params->rgrc[0].bottom = params->rgrc[0].top + h;
+                }
+                return 0;
+            }
+        }
+        break;
+
+    case WM_NCHITTEST:
+        {
+            SDL_Window *window = data->window;
+            if (window->hit_test) {
+                POINT winpoint = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
+                if (ScreenToClient(hwnd, &winpoint)) {
+                    const SDL_Point point = { (int) winpoint.x, (int) winpoint.y };
+                    const SDL_HitTestResult rc = window->hit_test(window, &point, window->hit_test_data);
+                    switch (rc) {
+                        #define POST_HIT_TEST(ret) { SDL_SendWindowEvent(data->window, SDL_WINDOWEVENT_HIT_TEST, 0, 0); return ret; }
+                        case SDL_HITTEST_DRAGGABLE: POST_HIT_TEST(HTCAPTION);
+                        case SDL_HITTEST_RESIZE_TOPLEFT: POST_HIT_TEST(HTTOPLEFT);
+                        case SDL_HITTEST_RESIZE_TOP: POST_HIT_TEST(HTTOP);
+                        case SDL_HITTEST_RESIZE_TOPRIGHT: POST_HIT_TEST(HTTOPRIGHT);
+                        case SDL_HITTEST_RESIZE_RIGHT: POST_HIT_TEST(HTRIGHT);
+                        case SDL_HITTEST_RESIZE_BOTTOMRIGHT: POST_HIT_TEST(HTBOTTOMRIGHT);
+                        case SDL_HITTEST_RESIZE_BOTTOM: POST_HIT_TEST(HTBOTTOM);
+                        case SDL_HITTEST_RESIZE_BOTTOMLEFT: POST_HIT_TEST(HTBOTTOMLEFT);
+                        case SDL_HITTEST_RESIZE_LEFT: POST_HIT_TEST(HTLEFT);
+                        #undef POST_HIT_TEST
+                        case SDL_HITTEST_NORMAL: return HTCLIENT;
+                    }
+                }
+                /* If we didn't return, this will call DefWindowProc below. */
+            }
+        }
+        break;
+    }
+
+    /* If there's a window proc, assume it's going to handle messages */
+    if (data->wndproc) {
+        return CallWindowProc(data->wndproc, hwnd, msg, wParam, lParam);
+    } else if (returnCode >= 0) {
+        return returnCode;
+    } else {
+        return CallWindowProc(DefWindowProc, hwnd, msg, wParam, lParam);
+    }
+}
+
+static void WIN_UpdateClipCursorForWindows()
+{
+    SDL_VideoDevice *_this = SDL_GetVideoDevice();
+    SDL_Window *window;
+
+    if (_this) {
+        for (window = _this->windows; window; window = window->next) {
+            if (window->driverdata) {
+                WIN_UpdateClipCursor(window);
+            }
+        }
+    }
+}
+
+/* A message hook called before TranslateMessage() */
+static SDL_WindowsMessageHook g_WindowsMessageHook = NULL;
+static void *g_WindowsMessageHookData = NULL;
+
+void SDL_SetWindowsMessageHook(SDL_WindowsMessageHook callback, void *userdata)
+{
+    g_WindowsMessageHook = callback;
+    g_WindowsMessageHookData = userdata;
+}
+
+void
+WIN_PumpEvents(_THIS)
+{
+    const Uint8 *keystate;
+    MSG msg;
+    DWORD start_ticks = GetTickCount();
+
+    if (g_WindowsEnableMessageLoop) {
+        while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
+            if (g_WindowsMessageHook) {
+                g_WindowsMessageHook(g_WindowsMessageHookData, msg.hwnd, msg.message, msg.wParam, msg.lParam);
+            }
+
+            /* Always translate the message in case it's a non-SDL window (e.g. with Qt integration) */
+            TranslateMessage(&msg);
+            DispatchMessage(&msg);
+
+            /* Make sure we don't busy loop here forever if there are lots of events coming in */
+            if (SDL_TICKS_PASSED(msg.time, start_ticks)) {
+                break;
+            }
+        }
+    }
+
+    /* Windows loses a shift KEYUP event when you have both pressed at once and let go of one.
+       You won't get a KEYUP until both are released, and that keyup will only be for the second
+       key you released. Take heroic measures and check the keystate as of the last handled event,
+       and if we think a key is pressed when Windows doesn't, unstick it in SDL's state. */
+    keystate = SDL_GetKeyboardState(NULL);
+    if ((keystate[SDL_SCANCODE_LSHIFT] == SDL_PRESSED) && !(GetKeyState(VK_LSHIFT) & 0x8000)) {
+        SDL_SendKeyboardKey(SDL_RELEASED, SDL_SCANCODE_LSHIFT);
+    }
+    if ((keystate[SDL_SCANCODE_RSHIFT] == SDL_PRESSED) && !(GetKeyState(VK_RSHIFT) & 0x8000)) {
+        SDL_SendKeyboardKey(SDL_RELEASED, SDL_SCANCODE_RSHIFT);
+    }
+
+    /* Update the clipping rect in case someone else has stolen it */
+    WIN_UpdateClipCursorForWindows();
+}
+
+/* to work around #3931, a bug introduced in Win10 Fall Creators Update (build nr. 16299)
+   we need to detect the windows version. this struct and the function below does that.
+   usually this struct and the corresponding function (RtlGetVersion) are in <Ntddk.h>
+   but here we just load it dynamically */
+struct SDL_WIN_OSVERSIONINFOW {
+    ULONG dwOSVersionInfoSize;
+    ULONG dwMajorVersion;
+    ULONG dwMinorVersion;
+    ULONG dwBuildNumber;
+    ULONG dwPlatformId;
+    WCHAR szCSDVersion[128];
+};
+
+static SDL_bool
+IsWin10FCUorNewer(void)
+{
+    HMODULE handle = GetModuleHandleW(L"ntdll.dll");
+    if (handle) {
+        typedef LONG(WINAPI* RtlGetVersionPtr)(struct SDL_WIN_OSVERSIONINFOW*);
+        RtlGetVersionPtr getVersionPtr = (RtlGetVersionPtr)GetProcAddress(handle, "RtlGetVersion");
+        if (getVersionPtr != NULL) {
+            struct SDL_WIN_OSVERSIONINFOW info;
+            SDL_zero(info);
+            info.dwOSVersionInfoSize = sizeof(info);
+            if (getVersionPtr(&info) == 0) { /* STATUS_SUCCESS == 0 */
+                if ((info.dwMajorVersion == 10 && info.dwMinorVersion == 0 && info.dwBuildNumber >= 16299) ||
+                    (info.dwMajorVersion == 10 && info.dwMinorVersion > 0) ||
+                    (info.dwMajorVersion > 10))
+                {
+                    return SDL_TRUE;
+                }
+            }
+        }
+    }
+    return SDL_FALSE;
+}
+
+static int app_registered = 0;
+LPTSTR SDL_Appname = NULL;
+Uint32 SDL_Appstyle = 0;
+HINSTANCE SDL_Instance = NULL;
+
+/* Register the class for this application */
+int
+SDL_RegisterApp(char *name, Uint32 style, void *hInst)
+{
+    const char *hint;
+    WNDCLASSEX wcex;
+    TCHAR path[MAX_PATH];
+
+    /* Only do this once... */
+    if (app_registered) {
+        ++app_registered;
+        return (0);
+    }
+    if (!name && !SDL_Appname) {
+        name = "SDL_app";
+#if defined(CS_BYTEALIGNCLIENT) || defined(CS_OWNDC)
+        SDL_Appstyle = (CS_BYTEALIGNCLIENT | CS_OWNDC);
+#endif
+        SDL_Instance = hInst ? hInst : GetModuleHandle(NULL);
+    }
+
+    if (name) {
+        SDL_Appname = WIN_UTF8ToString(name);
+        SDL_Appstyle = style;
+        SDL_Instance = hInst ? hInst : GetModuleHandle(NULL);
+    }
+
+    /* Register the application class */
+    wcex.cbSize         = sizeof(WNDCLASSEX);
+    wcex.hCursor        = NULL;
+    wcex.hIcon          = NULL;
+    wcex.hIconSm        = NULL;
+    wcex.lpszMenuName   = NULL;
+    wcex.lpszClassName  = SDL_Appname;
+    wcex.style          = SDL_Appstyle;
+    wcex.hbrBackground  = NULL;
+    wcex.lpfnWndProc    = WIN_WindowProc;
+    wcex.hInstance      = SDL_Instance;
+    wcex.cbClsExtra     = 0;
+    wcex.cbWndExtra     = 0;
+
+    hint = SDL_GetHint(SDL_HINT_WINDOWS_INTRESOURCE_ICON);
+    if (hint && *hint) {
+        wcex.hIcon = LoadIcon(SDL_Instance, MAKEINTRESOURCE(SDL_atoi(hint)));
+
+        hint = SDL_GetHint(SDL_HINT_WINDOWS_INTRESOURCE_ICON_SMALL);
+        if (hint && *hint) {
+            wcex.hIconSm = LoadIcon(SDL_Instance, MAKEINTRESOURCE(SDL_atoi(hint)));
+        }
+    } else {
+        /* Use the first icon as a default icon, like in the Explorer */
+        GetModuleFileName(SDL_Instance, path, MAX_PATH);
+        ExtractIconEx(path, 0, &wcex.hIcon, &wcex.hIconSm, 1);
+    }
+
+    if (!RegisterClassEx(&wcex)) {
+        return SDL_SetError("Couldn't register application class");
+    }
+
+    isWin10FCUorNewer = IsWin10FCUorNewer();
+
+    app_registered = 1;
+    return 0;
+}
+
+/* Unregisters the windowclass registered in SDL_RegisterApp above. */
+void
+SDL_UnregisterApp()
+{
+    WNDCLASSEX wcex;
+
+    /* SDL_RegisterApp might not have been called before */
+    if (!app_registered) {
+        return;
+    }
+    --app_registered;
+    if (app_registered == 0) {
+        /* Check for any registered window classes. */
+        if (GetClassInfoEx(SDL_Instance, SDL_Appname, &wcex)) {
+            UnregisterClass(SDL_Appname, SDL_Instance);
+            if (wcex.hIcon) DestroyIcon(wcex.hIcon);
+            if (wcex.hIconSm) DestroyIcon(wcex.hIconSm);
+        }
+        SDL_free(SDL_Appname);
+        SDL_Appname = NULL;
+    }
+}
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsevents.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowsevents.h
new file mode 100644
index 0000000..1ce2fb4
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsevents.h
@@ -0,0 +1,36 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_windowsevents_h_
+#define SDL_windowsevents_h_
+
+extern LPTSTR SDL_Appname;
+extern Uint32 SDL_Appstyle;
+extern HINSTANCE SDL_Instance;
+
+extern LRESULT CALLBACK WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam,
+                                       LPARAM lParam);
+extern void WIN_PumpEvents(_THIS);
+
+#endif /* SDL_windowsevents_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsframebuffer.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowsframebuffer.c
new file mode 100644
index 0000000..e07d9c4
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsframebuffer.c
@@ -0,0 +1,127 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+#include "SDL_windowsvideo.h"
+
+int WIN_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
+{
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+    size_t size;
+    LPBITMAPINFO info;
+    HBITMAP hbm;
+
+    /* Free the old framebuffer surface */
+    if (data->mdc) {
+        DeleteDC(data->mdc);
+    }
+    if (data->hbm) {
+        DeleteObject(data->hbm);
+    }
+
+    /* Find out the format of the screen */
+    size = sizeof(BITMAPINFOHEADER) + 256 * sizeof (RGBQUAD);
+    info = (LPBITMAPINFO)SDL_stack_alloc(Uint8, size);
+    if (!info) {
+        return SDL_OutOfMemory();
+    }
+
+    SDL_memset(info, 0, size);
+    info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+
+    /* The second call to GetDIBits() fills in the bitfields */
+    hbm = CreateCompatibleBitmap(data->hdc, 1, 1);
+    GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
+    GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
+    DeleteObject(hbm);
+
+    *format = SDL_PIXELFORMAT_UNKNOWN;
+    if (info->bmiHeader.biCompression == BI_BITFIELDS) {
+        int bpp;
+        Uint32 *masks;
+
+        bpp = info->bmiHeader.biPlanes * info->bmiHeader.biBitCount;
+        masks = (Uint32*)((Uint8*)info + info->bmiHeader.biSize);
+        *format = SDL_MasksToPixelFormatEnum(bpp, masks[0], masks[1], masks[2], 0);
+    }
+    if (*format == SDL_PIXELFORMAT_UNKNOWN)
+    {
+        /* We'll use RGB format for now */
+        *format = SDL_PIXELFORMAT_RGB888;
+
+        /* Create a new one */
+        SDL_memset(info, 0, size);
+        info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+        info->bmiHeader.biPlanes = 1;
+        info->bmiHeader.biBitCount = 32;
+        info->bmiHeader.biCompression = BI_RGB;
+    }
+
+    /* Fill in the size information */
+    *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
+    info->bmiHeader.biWidth = window->w;
+    info->bmiHeader.biHeight = -window->h;  /* negative for topdown bitmap */
+    info->bmiHeader.biSizeImage = window->h * (*pitch);
+
+    data->mdc = CreateCompatibleDC(data->hdc);
+    data->hbm = CreateDIBSection(data->hdc, info, DIB_RGB_COLORS, pixels, NULL, 0);
+    SDL_stack_free(info);
+
+    if (!data->hbm) {
+        return WIN_SetError("Unable to create DIB");
+    }
+    SelectObject(data->mdc, data->hbm);
+
+    return 0;
+}
+
+int WIN_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rect * rects, int numrects)
+{
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+
+    BitBlt(data->hdc, 0, 0, window->w, window->h, data->mdc, 0, 0, SRCCOPY);
+    return 0;
+}
+
+void WIN_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
+{
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+
+    if (!data) {
+        /* The window wasn't fully initialized */
+        return;
+    }
+
+    if (data->mdc) {
+        DeleteDC(data->mdc);
+        data->mdc = NULL;
+    }
+    if (data->hbm) {
+        DeleteObject(data->hbm);
+        data->hbm = NULL;
+    }
+}
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsframebuffer.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowsframebuffer.h
new file mode 100644
index 0000000..a83cca5
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsframebuffer.h
@@ -0,0 +1,27 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+extern int WIN_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch);
+extern int WIN_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rect * rects, int numrects);
+extern void WIN_DestroyWindowFramebuffer(_THIS, SDL_Window * window);
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowskeyboard.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowskeyboard.c
new file mode 100644
index 0000000..c7f357b
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowskeyboard.c
@@ -0,0 +1,1579 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+#include "SDL_windowsvideo.h"
+
+#include "../../events/SDL_keyboard_c.h"
+#include "../../events/scancodes_windows.h"
+
+#include <imm.h>
+#include <oleauto.h>
+
+#ifndef SDL_DISABLE_WINDOWS_IME
+static void IME_Init(SDL_VideoData *videodata, HWND hwnd);
+static void IME_Enable(SDL_VideoData *videodata, HWND hwnd);
+static void IME_Disable(SDL_VideoData *videodata, HWND hwnd);
+static void IME_Quit(SDL_VideoData *videodata);
+#endif /* !SDL_DISABLE_WINDOWS_IME */
+
+#ifndef MAPVK_VK_TO_VSC
+#define MAPVK_VK_TO_VSC     0
+#endif
+#ifndef MAPVK_VSC_TO_VK
+#define MAPVK_VSC_TO_VK     1
+#endif
+#ifndef MAPVK_VK_TO_CHAR
+#define MAPVK_VK_TO_CHAR    2
+#endif
+
+/* Alphabetic scancodes for PC keyboards */
+void
+WIN_InitKeyboard(_THIS)
+{
+    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
+
+    data->ime_com_initialized = SDL_FALSE;
+    data->ime_threadmgr = 0;
+    data->ime_initialized = SDL_FALSE;
+    data->ime_enabled = SDL_FALSE;
+    data->ime_available = SDL_FALSE;
+    data->ime_hwnd_main = 0;
+    data->ime_hwnd_current = 0;
+    data->ime_himc = 0;
+    data->ime_composition[0] = 0;
+    data->ime_readingstring[0] = 0;
+    data->ime_cursor = 0;
+
+    data->ime_candlist = SDL_FALSE;
+    SDL_memset(data->ime_candidates, 0, sizeof(data->ime_candidates));
+    data->ime_candcount = 0;
+    data->ime_candref = 0;
+    data->ime_candsel = 0;
+    data->ime_candpgsize = 0;
+    data->ime_candlistindexbase = 0;
+    data->ime_candvertical = SDL_TRUE;
+
+    data->ime_dirty = SDL_FALSE;
+    SDL_memset(&data->ime_rect, 0, sizeof(data->ime_rect));
+    SDL_memset(&data->ime_candlistrect, 0, sizeof(data->ime_candlistrect));
+    data->ime_winwidth = 0;
+    data->ime_winheight = 0;
+
+    data->ime_hkl = 0;
+    data->ime_himm32 = 0;
+    data->GetReadingString = 0;
+    data->ShowReadingWindow = 0;
+    data->ImmLockIMC = 0;
+    data->ImmUnlockIMC = 0;
+    data->ImmLockIMCC = 0;
+    data->ImmUnlockIMCC = 0;
+    data->ime_uiless = SDL_FALSE;
+    data->ime_threadmgrex = 0;
+    data->ime_uielemsinkcookie = TF_INVALID_COOKIE;
+    data->ime_alpnsinkcookie = TF_INVALID_COOKIE;
+    data->ime_openmodesinkcookie = TF_INVALID_COOKIE;
+    data->ime_convmodesinkcookie = TF_INVALID_COOKIE;
+    data->ime_uielemsink = 0;
+    data->ime_ippasink = 0;
+
+    WIN_UpdateKeymap();
+
+    SDL_SetScancodeName(SDL_SCANCODE_APPLICATION, "Menu");
+    SDL_SetScancodeName(SDL_SCANCODE_LGUI, "Left Windows");
+    SDL_SetScancodeName(SDL_SCANCODE_RGUI, "Right Windows");
+
+    /* Are system caps/num/scroll lock active? Set our state to match. */
+    SDL_ToggleModState(KMOD_CAPS, (GetKeyState(VK_CAPITAL) & 0x0001) != 0);
+    SDL_ToggleModState(KMOD_NUM, (GetKeyState(VK_NUMLOCK) & 0x0001) != 0);
+}
+
+void
+WIN_UpdateKeymap()
+{
+    int i;
+    SDL_Scancode scancode;
+    SDL_Keycode keymap[SDL_NUM_SCANCODES];
+
+    SDL_GetDefaultKeymap(keymap);
+
+    for (i = 0; i < SDL_arraysize(windows_scancode_table); i++) {
+        int vk;
+        /* Make sure this scancode is a valid character scancode */
+        scancode = windows_scancode_table[i];
+        if (scancode == SDL_SCANCODE_UNKNOWN ) {
+            continue;
+        }
+
+        /* If this key is one of the non-mappable keys, ignore it */
+        /* Not mapping numbers fixes the French layout, giving numeric keycodes for the number keys, which is the expected behavior */
+        if ((keymap[scancode] & SDLK_SCANCODE_MASK) ||
+            /*  scancode == SDL_SCANCODE_GRAVE || */ /* Uncomment this line to re-enable the behavior of not mapping the "`"(grave) key to the users actual keyboard layout */
+            (scancode >= SDL_SCANCODE_1 && scancode <= SDL_SCANCODE_0) ) {
+            continue;
+        }
+
+        vk =  MapVirtualKey(i, MAPVK_VSC_TO_VK);
+        if ( vk ) {
+            int ch = (MapVirtualKey( vk, MAPVK_VK_TO_CHAR ) & 0x7FFF);
+            if ( ch ) {
+                if ( ch >= 'A' && ch <= 'Z' ) {
+                    keymap[scancode] =  SDLK_a + ( ch - 'A' );
+                } else {
+                    keymap[scancode] = ch;
+                }
+            }
+        }
+    }
+
+    SDL_SetKeymap(0, keymap, SDL_NUM_SCANCODES);
+}
+
+void
+WIN_QuitKeyboard(_THIS)
+{
+#ifndef SDL_DISABLE_WINDOWS_IME
+    IME_Quit((SDL_VideoData *)_this->driverdata);
+#endif
+}
+
+void
+WIN_ResetDeadKeys()
+{
+    /*
+    if a deadkey has been typed, but not the next character (which the deadkey might modify), 
+    this tries to undo the effect pressing the deadkey.
+    see: http://archives.miloush.net/michkap/archive/2006/09/10/748775.html
+    */
+    BYTE keyboardState[256];
+    WCHAR buffer[16];
+    int keycode, scancode, result, i;
+
+    GetKeyboardState(keyboardState);
+
+    keycode = VK_SPACE;
+    scancode = MapVirtualKey(keycode, MAPVK_VK_TO_VSC);
+    if (scancode == 0) {
+        /* the keyboard doesn't have this key */
+        return;
+    }
+
+    for (i = 0; i < 5; i++) {
+        result = ToUnicode(keycode, scancode, keyboardState, (LPWSTR)buffer, 16, 0);
+        if (result > 0) {
+            /* success */
+            return;
+        }
+    }
+}
+
+void
+WIN_StartTextInput(_THIS)
+{
+#ifndef SDL_DISABLE_WINDOWS_IME
+    SDL_Window *window;
+#endif
+
+    WIN_ResetDeadKeys();
+
+#ifndef SDL_DISABLE_WINDOWS_IME
+    window = SDL_GetKeyboardFocus();
+    if (window) {
+        HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
+        SDL_VideoData *videodata = (SDL_VideoData *)_this->driverdata;
+        SDL_GetWindowSize(window, &videodata->ime_winwidth, &videodata->ime_winheight);
+        IME_Init(videodata, hwnd);
+        IME_Enable(videodata, hwnd);
+    }
+#endif /* !SDL_DISABLE_WINDOWS_IME */
+}
+
+void
+WIN_StopTextInput(_THIS)
+{
+#ifndef SDL_DISABLE_WINDOWS_IME
+    SDL_Window *window;
+#endif
+
+    WIN_ResetDeadKeys();
+
+#ifndef SDL_DISABLE_WINDOWS_IME
+    window = SDL_GetKeyboardFocus();
+    if (window) {
+        HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
+        SDL_VideoData *videodata = (SDL_VideoData *)_this->driverdata;
+        IME_Init(videodata, hwnd);
+        IME_Disable(videodata, hwnd);
+    }
+#endif /* !SDL_DISABLE_WINDOWS_IME */
+}
+
+void
+WIN_SetTextInputRect(_THIS, SDL_Rect *rect)
+{
+    SDL_VideoData *videodata = (SDL_VideoData *)_this->driverdata;
+    HIMC himc = 0;
+
+    if (!rect) {
+        SDL_InvalidParamError("rect");
+        return;
+    }
+
+    videodata->ime_rect = *rect;
+
+    himc = ImmGetContext(videodata->ime_hwnd_current);
+    if (himc)
+    {
+        COMPOSITIONFORM cf;
+        cf.ptCurrentPos.x = videodata->ime_rect.x;
+        cf.ptCurrentPos.y = videodata->ime_rect.y;
+        cf.dwStyle = CFS_FORCE_POSITION;
+        ImmSetCompositionWindow(himc, &cf);
+        ImmReleaseContext(videodata->ime_hwnd_current, himc);
+    }
+}
+
+#ifdef SDL_DISABLE_WINDOWS_IME
+
+
+SDL_bool
+IME_HandleMessage(HWND hwnd, UINT msg, WPARAM wParam, LPARAM *lParam, SDL_VideoData *videodata)
+{
+    return SDL_FALSE;
+}
+
+void IME_Present(SDL_VideoData *videodata)
+{
+}
+
+#else
+
+#ifdef SDL_msctf_h_
+#define USE_INIT_GUID
+#elif defined(__GNUC__)
+#define USE_INIT_GUID
+#endif
+#ifdef USE_INIT_GUID
+#undef DEFINE_GUID
+#define DEFINE_GUID(n,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8) static const GUID n = {l,w1,w2,{b1,b2,b3,b4,b5,b6,b7,b8}}
+DEFINE_GUID(IID_ITfInputProcessorProfileActivationSink,        0x71C6E74E,0x0F28,0x11D8,0xA8,0x2A,0x00,0x06,0x5B,0x84,0x43,0x5C);
+DEFINE_GUID(IID_ITfUIElementSink,                              0xEA1EA136,0x19DF,0x11D7,0xA6,0xD2,0x00,0x06,0x5B,0x84,0x43,0x5C);
+DEFINE_GUID(GUID_TFCAT_TIP_KEYBOARD,                           0x34745C63,0xB2F0,0x4784,0x8B,0x67,0x5E,0x12,0xC8,0x70,0x1A,0x31);
+DEFINE_GUID(IID_ITfSource,                                     0x4EA48A35,0x60AE,0x446F,0x8F,0xD6,0xE6,0xA8,0xD8,0x24,0x59,0xF7);
+DEFINE_GUID(IID_ITfUIElementMgr,                               0xEA1EA135,0x19DF,0x11D7,0xA6,0xD2,0x00,0x06,0x5B,0x84,0x43,0x5C);
+DEFINE_GUID(IID_ITfCandidateListUIElement,                     0xEA1EA138,0x19DF,0x11D7,0xA6,0xD2,0x00,0x06,0x5B,0x84,0x43,0x5C);
+DEFINE_GUID(IID_ITfReadingInformationUIElement,                0xEA1EA139,0x19DF,0x11D7,0xA6,0xD2,0x00,0x06,0x5B,0x84,0x43,0x5C);
+DEFINE_GUID(IID_ITfThreadMgr,                                  0xAA80E801,0x2021,0x11D2,0x93,0xE0,0x00,0x60,0xB0,0x67,0xB8,0x6E);
+DEFINE_GUID(CLSID_TF_ThreadMgr,                                0x529A9E6B,0x6587,0x4F23,0xAB,0x9E,0x9C,0x7D,0x68,0x3E,0x3C,0x50);
+DEFINE_GUID(IID_ITfThreadMgrEx,                                0x3E90ADE3,0x7594,0x4CB0,0xBB,0x58,0x69,0x62,0x8F,0x5F,0x45,0x8C);
+#endif
+
+#define LANG_CHT MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_TRADITIONAL)
+#define LANG_CHS MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED)
+
+#define MAKEIMEVERSION(major,minor) ((DWORD) (((BYTE)(major) << 24) | ((BYTE)(minor) << 16) ))
+#define IMEID_VER(id) ((id) & 0xffff0000)
+#define IMEID_LANG(id) ((id) & 0x0000ffff)
+
+#define CHT_HKL_DAYI            ((HKL)(UINT_PTR)0xE0060404)
+#define CHT_HKL_NEW_PHONETIC    ((HKL)(UINT_PTR)0xE0080404)
+#define CHT_HKL_NEW_CHANG_JIE   ((HKL)(UINT_PTR)0xE0090404)
+#define CHT_HKL_NEW_QUICK       ((HKL)(UINT_PTR)0xE00A0404)
+#define CHT_HKL_HK_CANTONESE    ((HKL)(UINT_PTR)0xE00B0404)
+#define CHT_IMEFILENAME1        "TINTLGNT.IME"
+#define CHT_IMEFILENAME2        "CINTLGNT.IME"
+#define CHT_IMEFILENAME3        "MSTCIPHA.IME"
+#define IMEID_CHT_VER42         (LANG_CHT | MAKEIMEVERSION(4, 2))
+#define IMEID_CHT_VER43         (LANG_CHT | MAKEIMEVERSION(4, 3))
+#define IMEID_CHT_VER44         (LANG_CHT | MAKEIMEVERSION(4, 4))
+#define IMEID_CHT_VER50         (LANG_CHT | MAKEIMEVERSION(5, 0))
+#define IMEID_CHT_VER51         (LANG_CHT | MAKEIMEVERSION(5, 1))
+#define IMEID_CHT_VER52         (LANG_CHT | MAKEIMEVERSION(5, 2))
+#define IMEID_CHT_VER60         (LANG_CHT | MAKEIMEVERSION(6, 0))
+#define IMEID_CHT_VER_VISTA     (LANG_CHT | MAKEIMEVERSION(7, 0))
+
+#define CHS_HKL                 ((HKL)(UINT_PTR)0xE00E0804)
+#define CHS_IMEFILENAME1        "PINTLGNT.IME"
+#define CHS_IMEFILENAME2        "MSSCIPYA.IME"
+#define IMEID_CHS_VER41         (LANG_CHS | MAKEIMEVERSION(4, 1))
+#define IMEID_CHS_VER42         (LANG_CHS | MAKEIMEVERSION(4, 2))
+#define IMEID_CHS_VER53         (LANG_CHS | MAKEIMEVERSION(5, 3))
+
+#define LANG() LOWORD((videodata->ime_hkl))
+#define PRIMLANG() ((WORD)PRIMARYLANGID(LANG()))
+#define SUBLANG() SUBLANGID(LANG())
+
+static void IME_UpdateInputLocale(SDL_VideoData *videodata);
+static void IME_ClearComposition(SDL_VideoData *videodata);
+static void IME_SetWindow(SDL_VideoData* videodata, HWND hwnd);
+static void IME_SetupAPI(SDL_VideoData *videodata);
+static DWORD IME_GetId(SDL_VideoData *videodata, UINT uIndex);
+static void IME_SendEditingEvent(SDL_VideoData *videodata);
+static void IME_DestroyTextures(SDL_VideoData *videodata);
+
+static SDL_bool UILess_SetupSinks(SDL_VideoData *videodata);
+static void UILess_ReleaseSinks(SDL_VideoData *videodata);
+static void UILess_EnableUIUpdates(SDL_VideoData *videodata);
+static void UILess_DisableUIUpdates(SDL_VideoData *videodata);
+
+static void
+IME_Init(SDL_VideoData *videodata, HWND hwnd)
+{
+    if (videodata->ime_initialized)
+        return;
+
+    videodata->ime_hwnd_main = hwnd;
+    if (SUCCEEDED(WIN_CoInitialize())) {
+        videodata->ime_com_initialized = SDL_TRUE;
+        CoCreateInstance(&CLSID_TF_ThreadMgr, NULL, CLSCTX_INPROC_SERVER, &IID_ITfThreadMgr, (LPVOID *)&videodata->ime_threadmgr);
+    }
+    videodata->ime_initialized = SDL_TRUE;
+    videodata->ime_himm32 = SDL_LoadObject("imm32.dll");
+    if (!videodata->ime_himm32) {
+        videodata->ime_available = SDL_FALSE;
+        SDL_ClearError();
+        return;
+    }
+    videodata->ImmLockIMC = (LPINPUTCONTEXT2 (WINAPI *)(HIMC))SDL_LoadFunction(videodata->ime_himm32, "ImmLockIMC");
+    videodata->ImmUnlockIMC = (BOOL (WINAPI *)(HIMC))SDL_LoadFunction(videodata->ime_himm32, "ImmUnlockIMC");
+    videodata->ImmLockIMCC = (LPVOID (WINAPI *)(HIMCC))SDL_LoadFunction(videodata->ime_himm32, "ImmLockIMCC");
+    videodata->ImmUnlockIMCC = (BOOL (WINAPI *)(HIMCC))SDL_LoadFunction(videodata->ime_himm32, "ImmUnlockIMCC");
+
+    IME_SetWindow(videodata, hwnd);
+    videodata->ime_himc = ImmGetContext(hwnd);
+    ImmReleaseContext(hwnd, videodata->ime_himc);
+    if (!videodata->ime_himc) {
+        videodata->ime_available = SDL_FALSE;
+        IME_Disable(videodata, hwnd);
+        return;
+    }
+    videodata->ime_available = SDL_TRUE;
+    IME_UpdateInputLocale(videodata);
+    IME_SetupAPI(videodata);
+    videodata->ime_uiless = UILess_SetupSinks(videodata);
+    IME_UpdateInputLocale(videodata);
+    IME_Disable(videodata, hwnd);
+}
+
+static void
+IME_Enable(SDL_VideoData *videodata, HWND hwnd)
+{
+    if (!videodata->ime_initialized || !videodata->ime_hwnd_current)
+        return;
+
+    if (!videodata->ime_available) {
+        IME_Disable(videodata, hwnd);
+        return;
+    }
+    if (videodata->ime_hwnd_current == videodata->ime_hwnd_main)
+        ImmAssociateContext(videodata->ime_hwnd_current, videodata->ime_himc);
+
+    videodata->ime_enabled = SDL_TRUE;
+    IME_UpdateInputLocale(videodata);
+    UILess_EnableUIUpdates(videodata);
+}
+
+static void
+IME_Disable(SDL_VideoData *videodata, HWND hwnd)
+{
+    if (!videodata->ime_initialized || !videodata->ime_hwnd_current)
+        return;
+
+    IME_ClearComposition(videodata);
+    if (videodata->ime_hwnd_current == videodata->ime_hwnd_main)
+        ImmAssociateContext(videodata->ime_hwnd_current, (HIMC)0);
+
+    videodata->ime_enabled = SDL_FALSE;
+    UILess_DisableUIUpdates(videodata);
+}
+
+static void
+IME_Quit(SDL_VideoData *videodata)
+{
+    if (!videodata->ime_initialized)
+        return;
+
+    UILess_ReleaseSinks(videodata);
+    if (videodata->ime_hwnd_main)
+        ImmAssociateContext(videodata->ime_hwnd_main, videodata->ime_himc);
+
+    videodata->ime_hwnd_main = 0;
+    videodata->ime_himc = 0;
+    if (videodata->ime_himm32) {
+        SDL_UnloadObject(videodata->ime_himm32);
+        videodata->ime_himm32 = 0;
+    }
+    if (videodata->ime_threadmgr) {
+        videodata->ime_threadmgr->lpVtbl->Release(videodata->ime_threadmgr);
+        videodata->ime_threadmgr = 0;
+    }
+    if (videodata->ime_com_initialized) {
+        WIN_CoUninitialize();
+        videodata->ime_com_initialized = SDL_FALSE;
+    }
+    IME_DestroyTextures(videodata);
+    videodata->ime_initialized = SDL_FALSE;
+}
+
+static void
+IME_GetReadingString(SDL_VideoData *videodata, HWND hwnd)
+{
+    DWORD id = 0;
+    HIMC himc = 0;
+    WCHAR buffer[16];
+    WCHAR *s = buffer;
+    DWORD len = 0;
+    INT err = 0;
+    BOOL vertical = FALSE;
+    UINT maxuilen = 0;
+
+    if (videodata->ime_uiless)
+        return;
+
+    videodata->ime_readingstring[0] = 0;
+    
+    id = IME_GetId(videodata, 0);
+    if (!id)
+        return;
+
+    himc = ImmGetContext(hwnd);
+    if (!himc)
+        return;
+
+    if (videodata->GetReadingString) {
+        len = videodata->GetReadingString(himc, 0, 0, &err, &vertical, &maxuilen);
+        if (len) {
+            if (len > SDL_arraysize(buffer))
+                len = SDL_arraysize(buffer);
+
+            len = videodata->GetReadingString(himc, len, s, &err, &vertical, &maxuilen);
+        }
+        SDL_wcslcpy(videodata->ime_readingstring, s, len);
+    }
+    else {
+        LPINPUTCONTEXT2 lpimc = videodata->ImmLockIMC(himc);
+        LPBYTE p = 0;
+        s = 0;
+        switch (id)
+        {
+        case IMEID_CHT_VER42:
+        case IMEID_CHT_VER43:
+        case IMEID_CHT_VER44:
+            p = *(LPBYTE *)((LPBYTE)videodata->ImmLockIMCC(lpimc->hPrivate) + 24);
+            if (!p)
+                break;
+
+            len = *(DWORD *)(p + 7*4 + 32*4);
+            s = (WCHAR *)(p + 56);
+            break;
+        case IMEID_CHT_VER51:
+        case IMEID_CHT_VER52:
+        case IMEID_CHS_VER53:
+            p = *(LPBYTE *)((LPBYTE)videodata->ImmLockIMCC(lpimc->hPrivate) + 4);
+            if (!p)
+                break;
+
+            p = *(LPBYTE *)((LPBYTE)p + 1*4 + 5*4);
+            if (!p)
+                break;
+
+            len = *(DWORD *)(p + 1*4 + (16*2+2*4) + 5*4 + 16*2);
+            s = (WCHAR *)(p + 1*4 + (16*2+2*4) + 5*4);
+            break;
+        case IMEID_CHS_VER41:
+            {
+                int offset = (IME_GetId(videodata, 1) >= 0x00000002) ? 8 : 7;
+                p = *(LPBYTE *)((LPBYTE)videodata->ImmLockIMCC(lpimc->hPrivate) + offset * 4);
+                if (!p)
+                    break;
+
+                len = *(DWORD *)(p + 7*4 + 16*2*4);
+                s = (WCHAR *)(p + 6*4 + 16*2*1);
+            }
+            break;
+        case IMEID_CHS_VER42:
+            p = *(LPBYTE *)((LPBYTE)videodata->ImmLockIMCC(lpimc->hPrivate) + 1*4 + 1*4 + 6*4);
+            if (!p)
+                break;
+
+            len = *(DWORD *)(p + 1*4 + (16*2+2*4) + 5*4 + 16*2);
+            s = (WCHAR *)(p + 1*4 + (16*2+2*4) + 5*4);
+            break;
+        }
+        if (s) {
+            size_t size = SDL_min((size_t)(len + 1), SDL_arraysize(videodata->ime_readingstring));
+            SDL_wcslcpy(videodata->ime_readingstring, s, size);
+        }
+
+        videodata->ImmUnlockIMCC(lpimc->hPrivate);
+        videodata->ImmUnlockIMC(himc);
+    }
+    ImmReleaseContext(hwnd, himc);
+    IME_SendEditingEvent(videodata);
+}
+
+static void
+IME_InputLangChanged(SDL_VideoData *videodata)
+{
+    UINT lang = PRIMLANG();
+    IME_UpdateInputLocale(videodata);
+    if (!videodata->ime_uiless)
+        videodata->ime_candlistindexbase = (videodata->ime_hkl == CHT_HKL_DAYI) ? 0 : 1;
+
+    IME_SetupAPI(videodata);
+    if (lang != PRIMLANG()) {
+        IME_ClearComposition(videodata);
+    }
+}
+
+static DWORD
+IME_GetId(SDL_VideoData *videodata, UINT uIndex)
+{
+    static HKL hklprev = 0;
+    static DWORD dwRet[2] = {0};
+    DWORD dwVerSize = 0;
+    DWORD dwVerHandle = 0;
+    LPVOID lpVerBuffer = 0;
+    LPVOID lpVerData = 0;
+    UINT cbVerData = 0;
+    char szTemp[256];
+    HKL hkl = 0;
+    DWORD dwLang = 0;
+    if (uIndex >= sizeof(dwRet) / sizeof(dwRet[0]))
+        return 0;
+
+    hkl = videodata->ime_hkl;
+    if (hklprev == hkl)
+        return dwRet[uIndex];
+
+    hklprev = hkl;
+    dwLang = ((DWORD_PTR)hkl & 0xffff);
+    if (videodata->ime_uiless && LANG() == LANG_CHT) {
+        dwRet[0] = IMEID_CHT_VER_VISTA;
+        dwRet[1] = 0;
+        return dwRet[0];
+    }
+    if (hkl != CHT_HKL_NEW_PHONETIC
+        && hkl != CHT_HKL_NEW_CHANG_JIE
+        && hkl != CHT_HKL_NEW_QUICK
+        && hkl != CHT_HKL_HK_CANTONESE
+        && hkl != CHS_HKL) {
+        dwRet[0] = dwRet[1] = 0;
+        return dwRet[uIndex];
+    }
+    if (ImmGetIMEFileNameA(hkl, szTemp, sizeof(szTemp) - 1) <= 0) {
+        dwRet[0] = dwRet[1] = 0;
+        return dwRet[uIndex];
+    }
+    if (!videodata->GetReadingString) {
+        #define LCID_INVARIANT MAKELCID(MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), SORT_DEFAULT)
+        if (CompareStringA(LCID_INVARIANT, NORM_IGNORECASE, szTemp, -1, CHT_IMEFILENAME1, -1) != 2
+            && CompareStringA(LCID_INVARIANT, NORM_IGNORECASE, szTemp, -1, CHT_IMEFILENAME2, -1) != 2
+            && CompareStringA(LCID_INVARIANT, NORM_IGNORECASE, szTemp, -1, CHT_IMEFILENAME3, -1) != 2
+            && CompareStringA(LCID_INVARIANT, NORM_IGNORECASE, szTemp, -1, CHS_IMEFILENAME1, -1) != 2
+            && CompareStringA(LCID_INVARIANT, NORM_IGNORECASE, szTemp, -1, CHS_IMEFILENAME2, -1) != 2) {
+            dwRet[0] = dwRet[1] = 0;
+            return dwRet[uIndex];
+        }
+        #undef LCID_INVARIANT
+        dwVerSize = GetFileVersionInfoSizeA(szTemp, &dwVerHandle);
+        if (dwVerSize) {
+            lpVerBuffer = SDL_malloc(dwVerSize);
+            if (lpVerBuffer) {
+                if (GetFileVersionInfoA(szTemp, dwVerHandle, dwVerSize, lpVerBuffer)) {
+                    if (VerQueryValueA(lpVerBuffer, "\\", &lpVerData, &cbVerData)) {
+                        #define pVerFixedInfo   ((VS_FIXEDFILEINFO FAR*)lpVerData)
+                        DWORD dwVer = pVerFixedInfo->dwFileVersionMS;
+                        dwVer = (dwVer & 0x00ff0000) << 8 | (dwVer & 0x000000ff) << 16;
+                        if ((videodata->GetReadingString) ||
+                            ((dwLang == LANG_CHT) && (
+                            dwVer == MAKEIMEVERSION(4, 2) ||
+                            dwVer == MAKEIMEVERSION(4, 3) ||
+                            dwVer == MAKEIMEVERSION(4, 4) ||
+                            dwVer == MAKEIMEVERSION(5, 0) ||
+                            dwVer == MAKEIMEVERSION(5, 1) ||
+                            dwVer == MAKEIMEVERSION(5, 2) ||
+                            dwVer == MAKEIMEVERSION(6, 0)))
+                            ||
+                            ((dwLang == LANG_CHS) && (
+                            dwVer == MAKEIMEVERSION(4, 1) ||
+                            dwVer == MAKEIMEVERSION(4, 2) ||
+                            dwVer == MAKEIMEVERSION(5, 3)))) {
+                            dwRet[0] = dwVer | dwLang;
+                            dwRet[1] = pVerFixedInfo->dwFileVersionLS;
+                            SDL_free(lpVerBuffer);
+                            return dwRet[0];
+                        }
+                        #undef pVerFixedInfo
+                    }
+                }
+            }
+            SDL_free(lpVerBuffer);
+        }
+    }
+    dwRet[0] = dwRet[1] = 0;
+    return dwRet[uIndex];
+}
+
+static void
+IME_SetupAPI(SDL_VideoData *videodata)
+{
+    char ime_file[MAX_PATH + 1];
+    void* hime = 0;
+    HKL hkl = 0;
+    videodata->GetReadingString = 0;
+    videodata->ShowReadingWindow = 0;
+    if (videodata->ime_uiless)
+        return;
+
+    hkl = videodata->ime_hkl;
+    if (ImmGetIMEFileNameA(hkl, ime_file, sizeof(ime_file) - 1) <= 0)
+        return;
+
+    hime = SDL_LoadObject(ime_file);
+    if (!hime)
+        return;
+
+    videodata->GetReadingString = (UINT (WINAPI *)(HIMC, UINT, LPWSTR, PINT, BOOL*, PUINT))
+        SDL_LoadFunction(hime, "GetReadingString");
+    videodata->ShowReadingWindow = (BOOL (WINAPI *)(HIMC, BOOL))
+        SDL_LoadFunction(hime, "ShowReadingWindow");
+
+    if (videodata->ShowReadingWindow) {
+        HIMC himc = ImmGetContext(videodata->ime_hwnd_current);
+        if (himc) {
+            videodata->ShowReadingWindow(himc, FALSE);
+            ImmReleaseContext(videodata->ime_hwnd_current, himc);
+        }
+    }
+}
+
+static void
+IME_SetWindow(SDL_VideoData* videodata, HWND hwnd)
+{
+    videodata->ime_hwnd_current = hwnd;
+    if (videodata->ime_threadmgr) {
+        struct ITfDocumentMgr *document_mgr = 0;
+        if (SUCCEEDED(videodata->ime_threadmgr->lpVtbl->AssociateFocus(videodata->ime_threadmgr, hwnd, NULL, &document_mgr))) {
+            if (document_mgr)
+                document_mgr->lpVtbl->Release(document_mgr);
+        }
+    }
+}
+
+static void
+IME_UpdateInputLocale(SDL_VideoData *videodata)
+{
+    static HKL hklprev = 0;
+    videodata->ime_hkl = GetKeyboardLayout(0);
+    if (hklprev == videodata->ime_hkl)
+        return;
+
+    hklprev = videodata->ime_hkl;
+    switch (PRIMLANG()) {
+    case LANG_CHINESE:
+        videodata->ime_candvertical = SDL_TRUE;
+        if (SUBLANG() == SUBLANG_CHINESE_SIMPLIFIED)
+            videodata->ime_candvertical = SDL_FALSE;
+
+        break;
+    case LANG_JAPANESE:
+        videodata->ime_candvertical = SDL_TRUE;
+        break;
+    case LANG_KOREAN:
+        videodata->ime_candvertical = SDL_FALSE;
+        break;
+    }
+}
+
+static void
+IME_ClearComposition(SDL_VideoData *videodata)
+{
+    HIMC himc = 0;
+    if (!videodata->ime_initialized)
+        return;
+
+    himc = ImmGetContext(videodata->ime_hwnd_current);
+    if (!himc)
+        return;
+
+    ImmNotifyIME(himc, NI_COMPOSITIONSTR, CPS_CANCEL, 0);
+    if (videodata->ime_uiless)
+        ImmSetCompositionString(himc, SCS_SETSTR, TEXT(""), sizeof(TCHAR), TEXT(""), sizeof(TCHAR));
+
+    ImmNotifyIME(himc, NI_CLOSECANDIDATE, 0, 0);
+    ImmReleaseContext(videodata->ime_hwnd_current, himc);
+    SDL_SendEditingText("", 0, 0);
+}
+
+static void
+IME_GetCompositionString(SDL_VideoData *videodata, HIMC himc, DWORD string)
+{
+    LONG length = ImmGetCompositionStringW(himc, string, videodata->ime_composition, sizeof(videodata->ime_composition) - sizeof(videodata->ime_composition[0]));
+    if (length < 0)
+        length = 0;
+
+    length /= sizeof(videodata->ime_composition[0]);
+    videodata->ime_cursor = LOWORD(ImmGetCompositionStringW(himc, GCS_CURSORPOS, 0, 0));
+    if (videodata->ime_cursor < SDL_arraysize(videodata->ime_composition) && videodata->ime_composition[videodata->ime_cursor] == 0x3000) {
+        int i;
+        for (i = videodata->ime_cursor + 1; i < length; ++i)
+            videodata->ime_composition[i - 1] = videodata->ime_composition[i];
+
+        --length;
+    }
+    videodata->ime_composition[length] = 0;
+}
+
+static void
+IME_SendInputEvent(SDL_VideoData *videodata)
+{
+    char *s = 0;
+    s = WIN_StringToUTF8(videodata->ime_composition);
+    SDL_SendKeyboardText(s);
+    SDL_free(s);
+
+    videodata->ime_composition[0] = 0;
+    videodata->ime_readingstring[0] = 0;
+    videodata->ime_cursor = 0;
+}
+
+static void
+IME_SendEditingEvent(SDL_VideoData *videodata)
+{
+    char *s = 0;
+    WCHAR buffer[SDL_TEXTEDITINGEVENT_TEXT_SIZE];
+    const size_t size = SDL_arraysize(buffer);
+    buffer[0] = 0;
+    if (videodata->ime_readingstring[0]) {
+        size_t len = SDL_min(SDL_wcslen(videodata->ime_composition), (size_t)videodata->ime_cursor);
+        SDL_wcslcpy(buffer, videodata->ime_composition, len + 1);
+        SDL_wcslcat(buffer, videodata->ime_readingstring, size);
+        SDL_wcslcat(buffer, &videodata->ime_composition[len], size);
+    }
+    else {
+        SDL_wcslcpy(buffer, videodata->ime_composition, size);
+    }
+    s = WIN_StringToUTF8(buffer);
+    SDL_SendEditingText(s, videodata->ime_cursor + (int)SDL_wcslen(videodata->ime_readingstring), 0);
+    SDL_free(s);
+}
+
+static void
+IME_AddCandidate(SDL_VideoData *videodata, UINT i, LPCWSTR candidate)
+{
+    LPWSTR dst = videodata->ime_candidates[i];
+    *dst++ = (WCHAR)(TEXT('0') + ((i + videodata->ime_candlistindexbase) % 10));
+    if (videodata->ime_candvertical)
+        *dst++ = TEXT(' ');
+
+    while (*candidate && (SDL_arraysize(videodata->ime_candidates[i]) > (dst - videodata->ime_candidates[i])))
+        *dst++ = *candidate++;
+
+    *dst = (WCHAR)'\0';
+}
+
+static void
+IME_GetCandidateList(HIMC himc, SDL_VideoData *videodata)
+{
+    LPCANDIDATELIST cand_list = 0;
+    DWORD size = ImmGetCandidateListW(himc, 0, 0, 0);
+    if (size) {
+        cand_list = (LPCANDIDATELIST)SDL_malloc(size);
+        if (cand_list) {
+            size = ImmGetCandidateListW(himc, 0, cand_list, size);
+            if (size) {
+                UINT i, j;
+                UINT page_start = 0;
+                videodata->ime_candsel = cand_list->dwSelection;
+                videodata->ime_candcount = cand_list->dwCount;
+
+                if (LANG() == LANG_CHS && IME_GetId(videodata, 0)) {
+                    const UINT maxcandchar = 18;
+                    size_t cchars = 0;
+
+                    for (i = 0; i < videodata->ime_candcount; ++i) {
+                        size_t len = SDL_wcslen((LPWSTR)((DWORD_PTR)cand_list + cand_list->dwOffset[i])) + 1;
+                        if (len + cchars > maxcandchar) {
+                            if (i > cand_list->dwSelection)
+                                break;
+
+                            page_start = i;
+                            cchars = len;
+                        }
+                        else {
+                            cchars += len;
+                        }
+                    }
+                    videodata->ime_candpgsize = i - page_start;
+                } else {
+                    videodata->ime_candpgsize = SDL_min(cand_list->dwPageSize, MAX_CANDLIST);
+                    if (videodata->ime_candpgsize > 0) {
+                        page_start = (cand_list->dwSelection / videodata->ime_candpgsize) * videodata->ime_candpgsize;
+                    } else {
+                        page_start = 0;
+                    }
+                }
+                SDL_memset(&videodata->ime_candidates, 0, sizeof(videodata->ime_candidates));
+                for (i = page_start, j = 0; (DWORD)i < cand_list->dwCount && j < (int)videodata->ime_candpgsize; i++, j++) {
+                    LPCWSTR candidate = (LPCWSTR)((DWORD_PTR)cand_list + cand_list->dwOffset[i]);
+                    IME_AddCandidate(videodata, j, candidate);
+                }
+                if (PRIMLANG() == LANG_KOREAN || (PRIMLANG() == LANG_CHT && !IME_GetId(videodata, 0)))
+                    videodata->ime_candsel = -1;
+
+            }
+            SDL_free(cand_list);
+        }
+    }
+}
+
+static void
+IME_ShowCandidateList(SDL_VideoData *videodata)
+{
+    videodata->ime_dirty = SDL_TRUE;
+    videodata->ime_candlist = SDL_TRUE;
+    IME_DestroyTextures(videodata);
+    IME_SendEditingEvent(videodata);
+}
+
+static void
+IME_HideCandidateList(SDL_VideoData *videodata)
+{
+    videodata->ime_dirty = SDL_FALSE;
+    videodata->ime_candlist = SDL_FALSE;
+    IME_DestroyTextures(videodata);
+    IME_SendEditingEvent(videodata);
+}
+
+SDL_bool
+IME_HandleMessage(HWND hwnd, UINT msg, WPARAM wParam, LPARAM *lParam, SDL_VideoData *videodata)
+{
+    SDL_bool trap = SDL_FALSE;
+    HIMC himc = 0;
+    if (!videodata->ime_initialized || !videodata->ime_available || !videodata->ime_enabled)
+        return SDL_FALSE;
+
+    switch (msg) {
+    case WM_INPUTLANGCHANGE:
+        IME_InputLangChanged(videodata);
+        break;
+    case WM_IME_SETCONTEXT:
+        *lParam = 0;
+        break;
+    case WM_IME_STARTCOMPOSITION:
+        trap = SDL_TRUE;
+        break;
+    case WM_IME_COMPOSITION:
+        trap = SDL_TRUE;
+        himc = ImmGetContext(hwnd);
+        if (*lParam & GCS_RESULTSTR) {
+            IME_GetCompositionString(videodata, himc, GCS_RESULTSTR);
+            IME_SendInputEvent(videodata);
+        }
+        if (*lParam & GCS_COMPSTR) {
+            if (!videodata->ime_uiless)
+                videodata->ime_readingstring[0] = 0;
+
+            IME_GetCompositionString(videodata, himc, GCS_COMPSTR);
+            IME_SendEditingEvent(videodata);
+        }
+        ImmReleaseContext(hwnd, himc);
+        break;
+    case WM_IME_ENDCOMPOSITION:
+        videodata->ime_composition[0] = 0;
+        videodata->ime_readingstring[0] = 0;
+        videodata->ime_cursor = 0;
+        SDL_SendEditingText("", 0, 0);
+        break;
+    case WM_IME_NOTIFY:
+        switch (wParam) {
+        case IMN_SETCONVERSIONMODE:
+        case IMN_SETOPENSTATUS:
+            IME_UpdateInputLocale(videodata);
+            break;
+        case IMN_OPENCANDIDATE:
+        case IMN_CHANGECANDIDATE:
+            if (videodata->ime_uiless)
+                break;
+
+            trap = SDL_TRUE;
+            IME_ShowCandidateList(videodata);
+            himc = ImmGetContext(hwnd);
+            if (!himc)
+                break;
+
+            IME_GetCandidateList(himc, videodata);
+            ImmReleaseContext(hwnd, himc);
+            break;
+        case IMN_CLOSECANDIDATE:
+            trap = SDL_TRUE;
+            IME_HideCandidateList(videodata);
+            break;
+        case IMN_PRIVATE:
+            {
+                DWORD dwId = IME_GetId(videodata, 0);
+                IME_GetReadingString(videodata, hwnd);
+                switch (dwId)
+                {
+                case IMEID_CHT_VER42:
+                case IMEID_CHT_VER43:
+                case IMEID_CHT_VER44:
+                case IMEID_CHS_VER41:
+                case IMEID_CHS_VER42:
+                    if (*lParam == 1 || *lParam == 2)
+                        trap = SDL_TRUE;
+
+                    break;
+                case IMEID_CHT_VER50:
+                case IMEID_CHT_VER51:
+                case IMEID_CHT_VER52:
+                case IMEID_CHT_VER60:
+                case IMEID_CHS_VER53:
+                    if (*lParam == 16
+                        || *lParam == 17
+                        || *lParam == 26
+                        || *lParam == 27
+                        || *lParam == 28)
+                        trap = SDL_TRUE;
+                    break;
+                }
+            }
+            break;
+        default:
+            trap = SDL_TRUE;
+            break;
+        }
+        break;
+    }
+    return trap;
+}
+
+static void
+IME_CloseCandidateList(SDL_VideoData *videodata)
+{
+    IME_HideCandidateList(videodata);
+    videodata->ime_candcount = 0;
+    SDL_memset(videodata->ime_candidates, 0, sizeof(videodata->ime_candidates));
+}
+
+static void
+UILess_GetCandidateList(SDL_VideoData *videodata, ITfCandidateListUIElement *pcandlist)
+{
+    UINT selection = 0;
+    UINT count = 0;
+    UINT page = 0;
+    UINT pgcount = 0;
+    DWORD pgstart = 0;
+    DWORD pgsize = 0;
+    UINT i, j;
+    pcandlist->lpVtbl->GetSelection(pcandlist, &selection);
+    pcandlist->lpVtbl->GetCount(pcandlist, &count);
+    pcandlist->lpVtbl->GetCurrentPage(pcandlist, &page);
+
+    videodata->ime_candsel = selection;
+    videodata->ime_candcount = count;
+    IME_ShowCandidateList(videodata);
+
+    pcandlist->lpVtbl->GetPageIndex(pcandlist, 0, 0, &pgcount);
+    if (pgcount > 0) {
+        UINT *idxlist = SDL_malloc(sizeof(UINT) * pgcount);
+        if (idxlist) {
+            pcandlist->lpVtbl->GetPageIndex(pcandlist, idxlist, pgcount, &pgcount);
+            pgstart = idxlist[page];
+            if (page < pgcount - 1)
+                pgsize = SDL_min(count, idxlist[page + 1]) - pgstart;
+            else
+                pgsize = count - pgstart;
+
+            SDL_free(idxlist);
+        }
+    }
+    videodata->ime_candpgsize = SDL_min(pgsize, MAX_CANDLIST);
+    videodata->ime_candsel = videodata->ime_candsel - pgstart;
+
+    SDL_memset(videodata->ime_candidates, 0, sizeof(videodata->ime_candidates));
+    for (i = pgstart, j = 0; (DWORD)i < count && j < videodata->ime_candpgsize; i++, j++) {
+        BSTR bstr;
+        if (SUCCEEDED(pcandlist->lpVtbl->GetString(pcandlist, i, &bstr))) {
+            if (bstr) {
+                IME_AddCandidate(videodata, j, bstr);
+                SysFreeString(bstr);
+            }
+        }
+    }
+    if (PRIMLANG() == LANG_KOREAN)
+        videodata->ime_candsel = -1;
+}
+
+STDMETHODIMP_(ULONG) TSFSink_AddRef(TSFSink *sink)
+{
+    return ++sink->refcount;
+}
+
+STDMETHODIMP_(ULONG) TSFSink_Release(TSFSink *sink)
+{
+    --sink->refcount;
+    if (sink->refcount == 0) {
+        SDL_free(sink);
+        return 0;
+    }
+    return sink->refcount;
+}
+
+STDMETHODIMP UIElementSink_QueryInterface(TSFSink *sink, REFIID riid, PVOID *ppv)
+{
+    if (!ppv)
+        return E_INVALIDARG;
+
+    *ppv = 0;
+    if (WIN_IsEqualIID(riid, &IID_IUnknown))
+        *ppv = (IUnknown *)sink;
+    else if (WIN_IsEqualIID(riid, &IID_ITfUIElementSink))
+        *ppv = (ITfUIElementSink *)sink;
+
+    if (*ppv) {
+        TSFSink_AddRef(sink);
+        return S_OK;
+    }
+    return E_NOINTERFACE;
+}
+
+ITfUIElement *UILess_GetUIElement(SDL_VideoData *videodata, DWORD dwUIElementId)
+{
+    ITfUIElementMgr *puiem = 0;
+    ITfUIElement *pelem = 0;
+    ITfThreadMgrEx *threadmgrex = videodata->ime_threadmgrex;
+
+    if (SUCCEEDED(threadmgrex->lpVtbl->QueryInterface(threadmgrex, &IID_ITfUIElementMgr, (LPVOID *)&puiem))) {
+        puiem->lpVtbl->GetUIElement(puiem, dwUIElementId, &pelem);
+        puiem->lpVtbl->Release(puiem);
+    }
+    return pelem;
+}
+
+STDMETHODIMP UIElementSink_BeginUIElement(TSFSink *sink, DWORD dwUIElementId, BOOL *pbShow)
+{
+    ITfUIElement *element = UILess_GetUIElement((SDL_VideoData *)sink->data, dwUIElementId);
+    ITfReadingInformationUIElement *preading = 0;
+    ITfCandidateListUIElement *pcandlist = 0;
+    SDL_VideoData *videodata = (SDL_VideoData *)sink->data;
+    if (!element)
+        return E_INVALIDARG;
+
+    *pbShow = FALSE;
+    if (SUCCEEDED(element->lpVtbl->QueryInterface(element, &IID_ITfReadingInformationUIElement, (LPVOID *)&preading))) {
+        BSTR bstr;
+        if (SUCCEEDED(preading->lpVtbl->GetString(preading, &bstr)) && bstr) {
+            SysFreeString(bstr);
+        }
+        preading->lpVtbl->Release(preading);
+    }
+    else if (SUCCEEDED(element->lpVtbl->QueryInterface(element, &IID_ITfCandidateListUIElement, (LPVOID *)&pcandlist))) {
+        videodata->ime_candref++;
+        UILess_GetCandidateList(videodata, pcandlist);
+        pcandlist->lpVtbl->Release(pcandlist);
+    }
+    return S_OK;
+}
+
+STDMETHODIMP UIElementSink_UpdateUIElement(TSFSink *sink, DWORD dwUIElementId)
+{
+    ITfUIElement *element = UILess_GetUIElement((SDL_VideoData *)sink->data, dwUIElementId);
+    ITfReadingInformationUIElement *preading = 0;
+    ITfCandidateListUIElement *pcandlist = 0;
+    SDL_VideoData *videodata = (SDL_VideoData *)sink->data;
+    if (!element)
+        return E_INVALIDARG;
+
+    if (SUCCEEDED(element->lpVtbl->QueryInterface(element, &IID_ITfReadingInformationUIElement, (LPVOID *)&preading))) {
+        BSTR bstr;
+        if (SUCCEEDED(preading->lpVtbl->GetString(preading, &bstr)) && bstr) {
+            WCHAR *s = (WCHAR *)bstr;
+            SDL_wcslcpy(videodata->ime_readingstring, s, SDL_arraysize(videodata->ime_readingstring));
+            IME_SendEditingEvent(videodata);
+            SysFreeString(bstr);
+        }
+        preading->lpVtbl->Release(preading);
+    }
+    else if (SUCCEEDED(element->lpVtbl->QueryInterface(element, &IID_ITfCandidateListUIElement, (LPVOID *)&pcandlist))) {
+        UILess_GetCandidateList(videodata, pcandlist);
+        pcandlist->lpVtbl->Release(pcandlist);
+    }
+    return S_OK;
+}
+
+STDMETHODIMP UIElementSink_EndUIElement(TSFSink *sink, DWORD dwUIElementId)
+{
+    ITfUIElement *element = UILess_GetUIElement((SDL_VideoData *)sink->data, dwUIElementId);
+    ITfReadingInformationUIElement *preading = 0;
+    ITfCandidateListUIElement *pcandlist = 0;
+    SDL_VideoData *videodata = (SDL_VideoData *)sink->data;
+    if (!element)
+        return E_INVALIDARG;
+
+    if (SUCCEEDED(element->lpVtbl->QueryInterface(element, &IID_ITfReadingInformationUIElement, (LPVOID *)&preading))) {
+        videodata->ime_readingstring[0] = 0;
+        IME_SendEditingEvent(videodata);
+        preading->lpVtbl->Release(preading);
+    }
+    if (SUCCEEDED(element->lpVtbl->QueryInterface(element, &IID_ITfCandidateListUIElement, (LPVOID *)&pcandlist))) {
+        videodata->ime_candref--;
+        if (videodata->ime_candref == 0)
+            IME_CloseCandidateList(videodata);
+
+        pcandlist->lpVtbl->Release(pcandlist);
+    }
+    return S_OK;
+}
+
+STDMETHODIMP IPPASink_QueryInterface(TSFSink *sink, REFIID riid, PVOID *ppv)
+{
+    if (!ppv)
+        return E_INVALIDARG;
+
+    *ppv = 0;
+    if (WIN_IsEqualIID(riid, &IID_IUnknown))
+        *ppv = (IUnknown *)sink;
+    else if (WIN_IsEqualIID(riid, &IID_ITfInputProcessorProfileActivationSink))
+        *ppv = (ITfInputProcessorProfileActivationSink *)sink;
+
+    if (*ppv) {
+        TSFSink_AddRef(sink);
+        return S_OK;
+    }
+    return E_NOINTERFACE;
+}
+
+STDMETHODIMP IPPASink_OnActivated(TSFSink *sink, DWORD dwProfileType, LANGID langid, REFCLSID clsid, REFGUID catid, REFGUID guidProfile, HKL hkl, DWORD dwFlags)
+{
+    static const GUID TF_PROFILE_DAYI = { 0x037B2C25, 0x480C, 0x4D7F, { 0xB0, 0x27, 0xD6, 0xCA, 0x6B, 0x69, 0x78, 0x8A } };
+    SDL_VideoData *videodata = (SDL_VideoData *)sink->data;
+    videodata->ime_candlistindexbase = WIN_IsEqualGUID(&TF_PROFILE_DAYI, guidProfile) ? 0 : 1;
+    if (WIN_IsEqualIID(catid, &GUID_TFCAT_TIP_KEYBOARD) && (dwFlags & TF_IPSINK_FLAG_ACTIVE))
+        IME_InputLangChanged((SDL_VideoData *)sink->data);
+
+    IME_HideCandidateList(videodata);
+    return S_OK;
+}
+
+static void *vtUIElementSink[] = {
+    (void *)(UIElementSink_QueryInterface),
+    (void *)(TSFSink_AddRef),
+    (void *)(TSFSink_Release),
+    (void *)(UIElementSink_BeginUIElement),
+    (void *)(UIElementSink_UpdateUIElement),
+    (void *)(UIElementSink_EndUIElement)
+};
+
+static void *vtIPPASink[] = {
+    (void *)(IPPASink_QueryInterface),
+    (void *)(TSFSink_AddRef),
+    (void *)(TSFSink_Release),
+    (void *)(IPPASink_OnActivated)
+};
+
+static void
+UILess_EnableUIUpdates(SDL_VideoData *videodata)
+{
+    ITfSource *source = 0;
+    if (!videodata->ime_threadmgrex || videodata->ime_uielemsinkcookie != TF_INVALID_COOKIE)
+        return;
+
+    if (SUCCEEDED(videodata->ime_threadmgrex->lpVtbl->QueryInterface(videodata->ime_threadmgrex, &IID_ITfSource, (LPVOID *)&source))) {
+        source->lpVtbl->AdviseSink(source, &IID_ITfUIElementSink, (IUnknown *)videodata->ime_uielemsink, &videodata->ime_uielemsinkcookie);
+        source->lpVtbl->Release(source);
+    }
+}
+
+static void
+UILess_DisableUIUpdates(SDL_VideoData *videodata)
+{
+    ITfSource *source = 0;
+    if (!videodata->ime_threadmgrex || videodata->ime_uielemsinkcookie == TF_INVALID_COOKIE)
+        return;
+
+    if (SUCCEEDED(videodata->ime_threadmgrex->lpVtbl->QueryInterface(videodata->ime_threadmgrex, &IID_ITfSource, (LPVOID *)&source))) {
+        source->lpVtbl->UnadviseSink(source, videodata->ime_uielemsinkcookie);
+        videodata->ime_uielemsinkcookie = TF_INVALID_COOKIE;
+        source->lpVtbl->Release(source);
+    }
+}
+
+static SDL_bool
+UILess_SetupSinks(SDL_VideoData *videodata)
+{
+    TfClientId clientid = 0;
+    SDL_bool result = SDL_FALSE;
+    ITfSource *source = 0;
+    if (FAILED(CoCreateInstance(&CLSID_TF_ThreadMgr, NULL, CLSCTX_INPROC_SERVER, &IID_ITfThreadMgrEx, (LPVOID *)&videodata->ime_threadmgrex)))
+        return SDL_FALSE;
+
+    if (FAILED(videodata->ime_threadmgrex->lpVtbl->ActivateEx(videodata->ime_threadmgrex, &clientid, TF_TMAE_UIELEMENTENABLEDONLY)))
+        return SDL_FALSE;
+
+    videodata->ime_uielemsink = SDL_malloc(sizeof(TSFSink));
+    videodata->ime_ippasink = SDL_malloc(sizeof(TSFSink));
+
+    videodata->ime_uielemsink->lpVtbl = vtUIElementSink;
+    videodata->ime_uielemsink->refcount = 1;
+    videodata->ime_uielemsink->data = videodata;
+
+    videodata->ime_ippasink->lpVtbl = vtIPPASink;
+    videodata->ime_ippasink->refcount = 1;
+    videodata->ime_ippasink->data = videodata;
+
+    if (SUCCEEDED(videodata->ime_threadmgrex->lpVtbl->QueryInterface(videodata->ime_threadmgrex, &IID_ITfSource, (LPVOID *)&source))) {
+        if (SUCCEEDED(source->lpVtbl->AdviseSink(source, &IID_ITfUIElementSink, (IUnknown *)videodata->ime_uielemsink, &videodata->ime_uielemsinkcookie))) {
+            if (SUCCEEDED(source->lpVtbl->AdviseSink(source, &IID_ITfInputProcessorProfileActivationSink, (IUnknown *)videodata->ime_ippasink, &videodata->ime_alpnsinkcookie))) {
+                result = SDL_TRUE;
+            }
+        }
+        source->lpVtbl->Release(source);
+    }
+    return result;
+}
+
+#define SAFE_RELEASE(p)                             \
+{                                                   \
+    if (p) {                                        \
+        (p)->lpVtbl->Release((p));                  \
+        (p) = 0;                                    \
+    }                                               \
+}
+
+static void
+UILess_ReleaseSinks(SDL_VideoData *videodata)
+{
+    ITfSource *source = 0;
+    if (videodata->ime_threadmgrex && SUCCEEDED(videodata->ime_threadmgrex->lpVtbl->QueryInterface(videodata->ime_threadmgrex, &IID_ITfSource, (LPVOID *)&source))) {
+        source->lpVtbl->UnadviseSink(source, videodata->ime_uielemsinkcookie);
+        source->lpVtbl->UnadviseSink(source, videodata->ime_alpnsinkcookie);
+        SAFE_RELEASE(source);
+        videodata->ime_threadmgrex->lpVtbl->Deactivate(videodata->ime_threadmgrex);
+        SAFE_RELEASE(videodata->ime_threadmgrex);
+        TSFSink_Release(videodata->ime_uielemsink);
+        videodata->ime_uielemsink = 0;
+        TSFSink_Release(videodata->ime_ippasink);
+        videodata->ime_ippasink = 0;
+    }
+}
+
+static void *
+StartDrawToBitmap(HDC hdc, HBITMAP *hhbm, int width, int height)
+{
+    BITMAPINFO info;
+    BITMAPINFOHEADER *infoHeader = &info.bmiHeader;
+    BYTE *bits = NULL;
+    if (hhbm) {
+        SDL_zero(info);
+        infoHeader->biSize = sizeof(BITMAPINFOHEADER);
+        infoHeader->biWidth = width;
+        infoHeader->biHeight = -1 * SDL_abs(height);
+        infoHeader->biPlanes = 1;
+        infoHeader->biBitCount = 32;
+        infoHeader->biCompression = BI_RGB;
+        *hhbm = CreateDIBSection(hdc, &info, DIB_RGB_COLORS, (void **)&bits, 0, 0);
+        if (*hhbm)
+            SelectObject(hdc, *hhbm);
+    }
+    return bits;
+}
+
+static void
+StopDrawToBitmap(HDC hdc, HBITMAP *hhbm)
+{
+    if (hhbm && *hhbm) {
+        DeleteObject(*hhbm);
+        *hhbm = NULL;
+    }
+}
+
+/* This draws only within the specified area and fills the entire region. */
+static void
+DrawRect(HDC hdc, int left, int top, int right, int bottom, int pensize)
+{
+    /* The case of no pen (PenSize = 0) is automatically taken care of. */
+    const int penadjust = (int)SDL_floor(pensize / 2.0f - 0.5f);
+    left += pensize / 2;
+    top += pensize / 2;
+    right -= penadjust;
+    bottom -= penadjust;
+    Rectangle(hdc, left, top, right, bottom);
+}
+
+static void
+IME_DestroyTextures(SDL_VideoData *videodata)
+{
+}
+
+#define SDL_swap(a,b) { \
+    int c = (a);        \
+    (a) = (b);          \
+    (b) = c;            \
+    }
+
+static void
+IME_PositionCandidateList(SDL_VideoData *videodata, SIZE size)
+{
+    int left, top, right, bottom;
+    SDL_bool ok = SDL_FALSE;
+    int winw = videodata->ime_winwidth;
+    int winh = videodata->ime_winheight;
+
+    /* Bottom */
+    left = videodata->ime_rect.x;
+    top = videodata->ime_rect.y + videodata->ime_rect.h;
+    right = left + size.cx;
+    bottom = top + size.cy;
+    if (right >= winw) {
+        left -= right - winw;
+        right = winw;
+    }
+    if (bottom < winh)
+        ok = SDL_TRUE;
+
+    /* Top */
+    if (!ok) {
+        left = videodata->ime_rect.x;
+        top = videodata->ime_rect.y - size.cy;
+        right = left + size.cx;
+        bottom = videodata->ime_rect.y;
+        if (right >= winw) {
+            left -= right - winw;
+            right = winw;
+        }
+        if (top >= 0)
+            ok = SDL_TRUE;
+    }
+
+    /* Right */
+    if (!ok) {
+        left = videodata->ime_rect.x + size.cx;
+        top = 0;
+        right = left + size.cx;
+        bottom = size.cy;
+        if (right < winw)
+            ok = SDL_TRUE;
+    }
+
+    /* Left */
+    if (!ok) {
+        left = videodata->ime_rect.x - size.cx;
+        top = 0;
+        right = videodata->ime_rect.x;
+        bottom = size.cy;
+        if (right >= 0)
+            ok = SDL_TRUE;
+    }
+
+    /* Window too small, show at (0,0) */
+    if (!ok) {
+        left = 0;
+        top = 0;
+        right = size.cx;
+        bottom = size.cy;
+    }
+
+    videodata->ime_candlistrect.x = left;
+    videodata->ime_candlistrect.y = top;
+    videodata->ime_candlistrect.w = right - left;
+    videodata->ime_candlistrect.h = bottom - top;
+}
+
+static void
+IME_RenderCandidateList(SDL_VideoData *videodata, HDC hdc)
+{
+    int i, j;
+    SIZE size = {0};
+    SIZE candsizes[MAX_CANDLIST];
+    SIZE maxcandsize = {0};
+    HBITMAP hbm = NULL;
+    const int candcount = SDL_min(SDL_min(MAX_CANDLIST, videodata->ime_candcount), videodata->ime_candpgsize);
+    SDL_bool vertical = videodata->ime_candvertical;
+
+    const int listborder = 1;
+    const int listpadding = 0;
+    const int listbordercolor = RGB(0xB4, 0xC7, 0xAA);
+    const int listfillcolor = RGB(255, 255, 255);
+
+    const int candborder = 1;
+    const int candpadding = 0;
+    const int candmargin = 1;
+    const COLORREF candbordercolor = RGB(255, 255, 255);
+    const COLORREF candfillcolor = RGB(255, 255, 255);
+    const COLORREF candtextcolor = RGB(0, 0, 0);
+    const COLORREF selbordercolor = RGB(0x84, 0xAC, 0xDD);
+    const COLORREF selfillcolor = RGB(0xD2, 0xE6, 0xFF);
+    const COLORREF seltextcolor = RGB(0, 0, 0);
+    const int horzcandspacing = 5;
+
+    HPEN listpen = listborder != 0 ? CreatePen(PS_SOLID, listborder, listbordercolor) : (HPEN)GetStockObject(NULL_PEN);
+    HBRUSH listbrush = CreateSolidBrush(listfillcolor);
+    HPEN candpen = candborder != 0 ? CreatePen(PS_SOLID, candborder, candbordercolor) : (HPEN)GetStockObject(NULL_PEN);
+    HBRUSH candbrush = CreateSolidBrush(candfillcolor);
+    HPEN selpen = candborder != 0 ? CreatePen(PS_DOT, candborder, selbordercolor) : (HPEN)GetStockObject(NULL_PEN);
+    HBRUSH selbrush = CreateSolidBrush(selfillcolor);
+    HFONT font = CreateFont((int)(1 + videodata->ime_rect.h * 0.75f), 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_CHARACTER_PRECIS, CLIP_DEFAULT_PRECIS, PROOF_QUALITY, VARIABLE_PITCH | FF_SWISS, TEXT("Microsoft Sans Serif"));
+
+    SetBkMode(hdc, TRANSPARENT);
+    SelectObject(hdc, font);
+
+    for (i = 0; i < candcount; ++i) {
+        const WCHAR *s = videodata->ime_candidates[i];
+        if (!*s)
+            break;
+
+        GetTextExtentPoint32W(hdc, s, (int)SDL_wcslen(s), &candsizes[i]);
+        maxcandsize.cx = SDL_max(maxcandsize.cx, candsizes[i].cx);
+        maxcandsize.cy = SDL_max(maxcandsize.cy, candsizes[i].cy);
+
+    }
+    if (vertical) {
+        size.cx =
+            (listborder * 2) +
+            (listpadding * 2) +
+            (candmargin * 2) +
+            (candborder * 2) +
+            (candpadding * 2) +
+            (maxcandsize.cx)
+            ;
+        size.cy =
+            (listborder * 2) +
+            (listpadding * 2) +
+            ((candcount + 1) * candmargin) +
+            (candcount * candborder * 2) +
+            (candcount * candpadding * 2) +
+            (candcount * maxcandsize.cy)
+            ;
+    }
+    else {
+        size.cx =
+            (listborder * 2) +
+            (listpadding * 2) +
+            ((candcount + 1) * candmargin) +
+            (candcount * candborder * 2) +
+            (candcount * candpadding * 2) +
+            ((candcount - 1) * horzcandspacing);
+        ;
+
+        for (i = 0; i < candcount; ++i)
+            size.cx += candsizes[i].cx;
+
+        size.cy =
+            (listborder * 2) +
+            (listpadding * 2) +
+            (candmargin * 2) +
+            (candborder * 2) +
+            (candpadding * 2) +
+            (maxcandsize.cy)
+            ;
+    }
+
+    StartDrawToBitmap(hdc, &hbm, size.cx, size.cy);
+
+    SelectObject(hdc, listpen);
+    SelectObject(hdc, listbrush);
+    DrawRect(hdc, 0, 0, size.cx, size.cy, listborder);
+
+    SelectObject(hdc, candpen);
+    SelectObject(hdc, candbrush);
+    SetTextColor(hdc, candtextcolor);
+    SetBkMode(hdc, TRANSPARENT);
+
+    for (i = 0; i < candcount; ++i) {
+        const WCHAR *s = videodata->ime_candidates[i];
+        int left, top, right, bottom;
+        if (!*s)
+            break;
+
+        if (vertical) {
+            left = listborder + listpadding + candmargin;
+            top = listborder + listpadding + (i * candborder * 2) + (i * candpadding * 2) + ((i + 1) * candmargin) + (i * maxcandsize.cy);
+            right = size.cx - listborder - listpadding - candmargin;
+            bottom = top + maxcandsize.cy + (candpadding * 2) + (candborder * 2);
+        }
+        else {
+            left = listborder + listpadding + (i * candborder * 2) + (i * candpadding * 2) + ((i + 1) * candmargin) + (i * horzcandspacing);
+
+            for (j = 0; j < i; ++j)
+                left += candsizes[j].cx;
+
+            top = listborder + listpadding + candmargin;
+            right = left + candsizes[i].cx + (candpadding * 2) + (candborder * 2);
+            bottom = size.cy - listborder - listpadding - candmargin;
+        }
+
+        if (i == videodata->ime_candsel) {
+            SelectObject(hdc, selpen);
+            SelectObject(hdc, selbrush);
+            SetTextColor(hdc, seltextcolor);
+        }
+        else {
+            SelectObject(hdc, candpen);
+            SelectObject(hdc, candbrush);
+            SetTextColor(hdc, candtextcolor);
+        }
+
+        DrawRect(hdc, left, top, right, bottom, candborder);
+        ExtTextOutW(hdc, left + candborder + candpadding, top + candborder + candpadding, 0, NULL, s, (int)SDL_wcslen(s), NULL);
+    }
+    StopDrawToBitmap(hdc, &hbm);
+
+    DeleteObject(listpen);
+    DeleteObject(listbrush);
+    DeleteObject(candpen);
+    DeleteObject(candbrush);
+    DeleteObject(selpen);
+    DeleteObject(selbrush);
+    DeleteObject(font);
+
+    IME_PositionCandidateList(videodata, size);
+}
+
+static void
+IME_Render(SDL_VideoData *videodata)
+{
+    HDC hdc = CreateCompatibleDC(NULL);
+
+    if (videodata->ime_candlist)
+        IME_RenderCandidateList(videodata, hdc);
+
+    DeleteDC(hdc);
+
+    videodata->ime_dirty = SDL_FALSE;
+}
+
+void IME_Present(SDL_VideoData *videodata)
+{
+    if (videodata->ime_dirty)
+        IME_Render(videodata);
+
+    /* FIXME: Need to show the IME bitmap */
+}
+
+#endif /* SDL_DISABLE_WINDOWS_IME */
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowskeyboard.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowskeyboard.h
new file mode 100644
index 0000000..49a1b87
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowskeyboard.h
@@ -0,0 +1,40 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_windowskeyboard_h_
+#define SDL_windowskeyboard_h_
+
+extern void WIN_InitKeyboard(_THIS);
+extern void WIN_UpdateKeymap(void);
+extern void WIN_QuitKeyboard(_THIS);
+
+extern void WIN_ResetDeadKeys(void);
+
+extern void WIN_StartTextInput(_THIS);
+extern void WIN_StopTextInput(_THIS);
+extern void WIN_SetTextInputRect(_THIS, SDL_Rect *rect);
+
+extern SDL_bool IME_HandleMessage(HWND hwnd, UINT msg, WPARAM wParam, LPARAM *lParam, struct SDL_VideoData *videodata);
+
+#endif /* SDL_windowskeyboard_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsmessagebox.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmessagebox.c
new file mode 100644
index 0000000..9ddb9e2
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmessagebox.c
@@ -0,0 +1,905 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+#ifdef HAVE_LIMITS_H
+#include <limits.h>
+#else
+#ifndef SIZE_MAX
+#define SIZE_MAX ((size_t)-1)
+#endif
+#endif
+
+#include "../../core/windows/SDL_windows.h"
+
+#include "SDL_assert.h"
+#include "SDL_windowsvideo.h"
+#include "SDL_windowstaskdialog.h"
+
+#ifndef SS_EDITCONTROL
+#define SS_EDITCONTROL  0x2000
+#endif
+
+#ifndef IDOK
+#define IDOK 1
+#endif
+
+#ifndef IDCANCEL
+#define IDCANCEL 2
+#endif
+
+/* Custom dialog return codes */
+#define IDCLOSED 20
+#define IDINVALPTRINIT 50
+#define IDINVALPTRCOMMAND 51
+#define IDINVALPTRSETFOCUS 52
+#define IDINVALPTRDLGITEM 53
+/* First button ID */
+#define IDBUTTONINDEX0 100
+
+#define DLGITEMTYPEBUTTON 0x0080
+#define DLGITEMTYPESTATIC 0x0082
+
+/* Windows only sends the lower 16 bits of the control ID when a button
+ * gets clicked. There are also some predefined and custom IDs that lower
+ * the available number further. 2^16 - 101 buttons should be enough for
+ * everyone, no need to make the code more complex.
+ */
+#define MAX_BUTTONS (0xffff - 100)
+
+
+/* Display a Windows message box */
+
+#pragma pack(push, 1)
+
+typedef struct
+{
+    WORD dlgVer;
+    WORD signature;
+    DWORD helpID;
+    DWORD exStyle;
+    DWORD style;
+    WORD cDlgItems;
+    short x;
+    short y;
+    short cx;
+    short cy;
+} DLGTEMPLATEEX;
+
+typedef struct
+{
+    DWORD helpID;
+    DWORD exStyle;
+    DWORD style;
+    short x;
+    short y;
+    short cx;
+    short cy;
+    DWORD id;
+} DLGITEMTEMPLATEEX;
+
+#pragma pack(pop)
+
+typedef struct
+{
+    DLGTEMPLATEEX* lpDialog;
+    Uint8 *data;
+    size_t size;
+    size_t used;
+    WORD numbuttons;
+} WIN_DialogData;
+
+static SDL_bool GetButtonIndex(const SDL_MessageBoxData *messageboxdata, Uint32 flags, size_t *i)
+{
+    for (*i = 0; *i < (size_t)messageboxdata->numbuttons; ++*i) {
+        if (messageboxdata->buttons[*i].flags & flags) {
+            return SDL_TRUE;
+        }
+    }
+    return SDL_FALSE;
+}
+
+static INT_PTR MessageBoxDialogProc(HWND hDlg, UINT iMessage, WPARAM wParam, LPARAM lParam)
+{
+    const SDL_MessageBoxData *messageboxdata;
+    size_t buttonindex;
+
+    switch ( iMessage ) {
+    case WM_INITDIALOG:
+        if (lParam == 0) {
+            EndDialog(hDlg, IDINVALPTRINIT);
+            return TRUE;
+        }
+        messageboxdata = (const SDL_MessageBoxData *)lParam;
+        SetWindowLongPtr(hDlg, GWLP_USERDATA, lParam);
+
+        if (GetButtonIndex(messageboxdata, SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT, &buttonindex)) {
+            /* Focus on the first default return-key button */
+            HWND buttonctl = GetDlgItem(hDlg, (int)(IDBUTTONINDEX0 + buttonindex));
+            if (buttonctl == NULL) {
+                EndDialog(hDlg, IDINVALPTRDLGITEM);
+            }
+            PostMessage(hDlg, WM_NEXTDLGCTL, (WPARAM)buttonctl, TRUE);
+        } else {
+            /* Give the focus to the dialog window instead */
+            SetFocus(hDlg);
+        }
+        return FALSE;
+    case WM_SETFOCUS:
+        messageboxdata = (const SDL_MessageBoxData *)GetWindowLongPtr(hDlg, GWLP_USERDATA);
+        if (messageboxdata == NULL) {
+            EndDialog(hDlg, IDINVALPTRSETFOCUS);
+            return TRUE;
+        }
+
+        /* Let the default button be focused if there is one. Otherwise, prevent any initial focus. */
+        if (GetButtonIndex(messageboxdata, SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT, &buttonindex)) {
+            return FALSE;
+        }
+        return TRUE;
+    case WM_COMMAND:
+        messageboxdata = (const SDL_MessageBoxData *)GetWindowLongPtr(hDlg, GWLP_USERDATA);
+        if (messageboxdata == NULL) {
+            EndDialog(hDlg, IDINVALPTRCOMMAND);
+            return TRUE;
+        }
+
+        /* Return the ID of the button that was pushed */
+        if (wParam == IDOK) {
+            if (GetButtonIndex(messageboxdata, SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT, &buttonindex)) {
+                EndDialog(hDlg, IDBUTTONINDEX0 + buttonindex);
+            }
+        } else if (wParam == IDCANCEL) {
+            if (GetButtonIndex(messageboxdata, SDL_MESSAGEBOX_BUTTON_ESCAPEKEY_DEFAULT, &buttonindex)) {
+                EndDialog(hDlg, IDBUTTONINDEX0 + buttonindex);
+            } else {
+                /* Closing of window was requested by user or system. It would be rude not to comply. */
+                EndDialog(hDlg, IDCLOSED);
+            }
+        } else if (wParam >= IDBUTTONINDEX0 && (int)wParam - IDBUTTONINDEX0 < messageboxdata->numbuttons) {
+            EndDialog(hDlg, wParam);
+        }
+        return TRUE;
+
+    default:
+        break;
+    }
+    return FALSE;
+}
+
+static SDL_bool ExpandDialogSpace(WIN_DialogData *dialog, size_t space)
+{
+    /* Growing memory in 64 KiB steps. */
+    const size_t sizestep = 0x10000;
+    size_t size = dialog->size;
+
+    if (size == 0) {
+        /* Start with 4 KiB or a multiple of 64 KiB to fit the data. */
+        size = 0x1000;
+        if (SIZE_MAX - sizestep < space) {
+            size = space;
+        } else if (space > size) {
+            size = (space + sizestep) & ~(sizestep - 1);
+        }
+    } else if (SIZE_MAX - dialog->used < space) {
+        SDL_OutOfMemory();
+        return SDL_FALSE;
+    } else if (SIZE_MAX - (dialog->used + space) < sizestep) {
+        /* Close to the maximum. */
+        size = dialog->used + space;
+    } else if (size < dialog->used + space) {
+        /* Round up to the next 64 KiB block. */
+        size = dialog->used + space;
+        size += sizestep - size % sizestep;
+    }
+
+    if (size > dialog->size) {
+        void *data = SDL_realloc(dialog->data, size);
+        if (!data) {
+            SDL_OutOfMemory();
+            return SDL_FALSE;
+        }
+        dialog->data = data;
+        dialog->size = size;
+        dialog->lpDialog = (DLGTEMPLATEEX*)dialog->data;
+    }
+    return SDL_TRUE;
+}
+
+static SDL_bool AlignDialogData(WIN_DialogData *dialog, size_t size)
+{
+    size_t padding = (dialog->used % size);
+
+    if (!ExpandDialogSpace(dialog, padding)) {
+        return SDL_FALSE;
+    }
+
+    dialog->used += padding;
+
+    return SDL_TRUE;
+}
+
+static SDL_bool AddDialogData(WIN_DialogData *dialog, const void *data, size_t size)
+{
+    if (!ExpandDialogSpace(dialog, size)) {
+        return SDL_FALSE;
+    }
+
+    SDL_memcpy(dialog->data+dialog->used, data, size);
+    dialog->used += size;
+
+    return SDL_TRUE;
+}
+
+static SDL_bool AddDialogString(WIN_DialogData *dialog, const char *string)
+{
+    WCHAR *wstring;
+    WCHAR *p;
+    size_t count;
+    SDL_bool status;
+
+    if (!string) {
+        string = "";
+    }
+
+    wstring = WIN_UTF8ToString(string);
+    if (!wstring) {
+        return SDL_FALSE;
+    }
+
+    /* Find out how many characters we have, including null terminator */
+    count = 0;
+    for (p = wstring; *p; ++p) {
+        ++count;
+    }
+    ++count;
+
+    status = AddDialogData(dialog, wstring, count*sizeof(WCHAR));
+    SDL_free(wstring);
+    return status;
+}
+
+static int s_BaseUnitsX;
+static int s_BaseUnitsY;
+static void Vec2ToDLU(short *x, short *y)
+{
+    SDL_assert(s_BaseUnitsX != 0); /* we init in WIN_ShowMessageBox(), which is the only public function... */
+
+    *x = MulDiv(*x, 4, s_BaseUnitsX);
+    *y = MulDiv(*y, 8, s_BaseUnitsY);
+}
+
+
+static SDL_bool AddDialogControl(WIN_DialogData *dialog, WORD type, DWORD style, DWORD exStyle, int x, int y, int w, int h, int id, const char *caption, WORD ordinal)
+{
+    DLGITEMTEMPLATEEX item;
+    WORD marker = 0xFFFF;
+    WORD extraData = 0;
+
+    SDL_zero(item);
+    item.style = style;
+    item.exStyle = exStyle;
+    item.x = x;
+    item.y = y;
+    item.cx = w;
+    item.cy = h;
+    item.id = id;
+
+    Vec2ToDLU(&item.x, &item.y);
+    Vec2ToDLU(&item.cx, &item.cy);
+
+    if (!AlignDialogData(dialog, sizeof(DWORD))) {
+        return SDL_FALSE;
+    }
+    if (!AddDialogData(dialog, &item, sizeof(item))) {
+        return SDL_FALSE;
+    }
+    if (!AddDialogData(dialog, &marker, sizeof(marker))) {
+        return SDL_FALSE;
+    }
+    if (!AddDialogData(dialog, &type, sizeof(type))) {
+        return SDL_FALSE;
+    }
+    if (type == DLGITEMTYPEBUTTON || (type == DLGITEMTYPESTATIC && caption != NULL)) {
+        if (!AddDialogString(dialog, caption)) {
+            return SDL_FALSE;
+        }
+    } else {
+        if (!AddDialogData(dialog, &marker, sizeof(marker))) {
+            return SDL_FALSE;
+        }
+        if (!AddDialogData(dialog, &ordinal, sizeof(ordinal))) {
+            return SDL_FALSE;
+        }
+    }
+    if (!AddDialogData(dialog, &extraData, sizeof(extraData))) {
+        return SDL_FALSE;
+    }
+    if (type == DLGITEMTYPEBUTTON) {
+        dialog->numbuttons++;
+    }
+    ++dialog->lpDialog->cDlgItems;
+
+    return SDL_TRUE;
+}
+
+static SDL_bool AddDialogStaticText(WIN_DialogData *dialog, int x, int y, int w, int h, const char *text)
+{
+    DWORD style = WS_VISIBLE | WS_CHILD | SS_LEFT | SS_NOPREFIX | SS_EDITCONTROL | WS_GROUP;
+    return AddDialogControl(dialog, DLGITEMTYPESTATIC, style, 0, x, y, w, h, -1, text, 0);
+}
+
+static SDL_bool AddDialogStaticIcon(WIN_DialogData *dialog, int x, int y, int w, int h, Uint16 ordinal)
+{
+    DWORD style = WS_VISIBLE | WS_CHILD | SS_ICON | WS_GROUP;
+    return AddDialogControl(dialog, DLGITEMTYPESTATIC, style, 0, x, y, w, h, -2, NULL, ordinal);
+}
+
+static SDL_bool AddDialogButton(WIN_DialogData *dialog, int x, int y, int w, int h, const char *text, int id, SDL_bool isDefault)
+{
+    DWORD style = WS_VISIBLE | WS_CHILD | WS_TABSTOP;
+    if (isDefault) {
+        style |= BS_DEFPUSHBUTTON;
+    } else {
+        style |= BS_PUSHBUTTON;
+    }
+    /* The first button marks the start of the group. */
+    if (dialog->numbuttons == 0) {
+        style |= WS_GROUP;
+    }
+    return AddDialogControl(dialog, DLGITEMTYPEBUTTON, style, 0, x, y, w, h, IDBUTTONINDEX0 + dialog->numbuttons, text, 0);
+}
+
+static void FreeDialogData(WIN_DialogData *dialog)
+{
+    SDL_free(dialog->data);
+    SDL_free(dialog);
+}
+
+static WIN_DialogData *CreateDialogData(int w, int h, const char *caption)
+{
+    WIN_DialogData *dialog;
+    DLGTEMPLATEEX dialogTemplate;
+    WORD WordToPass;
+
+    SDL_zero(dialogTemplate);
+    dialogTemplate.dlgVer = 1;
+    dialogTemplate.signature = 0xffff;
+    dialogTemplate.style = (WS_CAPTION | DS_CENTER | DS_SHELLFONT);
+    dialogTemplate.x = 0;
+    dialogTemplate.y = 0;
+    dialogTemplate.cx = w;
+    dialogTemplate.cy = h;
+    Vec2ToDLU(&dialogTemplate.cx, &dialogTemplate.cy);
+
+    dialog = (WIN_DialogData *)SDL_calloc(1, sizeof(*dialog));
+    if (!dialog) {
+        return NULL;
+    }
+
+    if (!AddDialogData(dialog, &dialogTemplate, sizeof(dialogTemplate))) {
+        FreeDialogData(dialog);
+        return NULL;
+    }
+
+    /* No menu */
+    WordToPass = 0;
+    if (!AddDialogData(dialog, &WordToPass, 2)) {
+        FreeDialogData(dialog);
+        return NULL;
+    }
+
+    /* No custom class */
+    if (!AddDialogData(dialog, &WordToPass, 2)) {
+        FreeDialogData(dialog);
+        return NULL;
+    }
+
+    /* title */
+    if (!AddDialogString(dialog, caption)) {
+        FreeDialogData(dialog);
+        return NULL;
+    }
+
+    /* Font stuff */
+    {
+        /*
+         * We want to use the system messagebox font.
+         */
+        BYTE ToPass;
+
+        NONCLIENTMETRICSA NCM;
+        NCM.cbSize = sizeof(NCM);
+        SystemParametersInfoA(SPI_GETNONCLIENTMETRICS, 0, &NCM, 0);
+
+        /* Font size - convert to logical font size for dialog parameter. */
+        {
+            HDC ScreenDC = GetDC(NULL);
+            int LogicalPixelsY = GetDeviceCaps(ScreenDC, LOGPIXELSY);
+            if (!LogicalPixelsY) /* This can happen if the application runs out of GDI handles */
+                LogicalPixelsY = 72;
+            WordToPass = (WORD)(-72 * NCM.lfMessageFont.lfHeight / LogicalPixelsY);
+            ReleaseDC(NULL, ScreenDC);
+        }
+
+        if (!AddDialogData(dialog, &WordToPass, 2)) {
+            FreeDialogData(dialog);
+            return NULL;
+        }
+
+        /* Font weight */
+        WordToPass = (WORD)NCM.lfMessageFont.lfWeight;
+        if (!AddDialogData(dialog, &WordToPass, 2)) {
+            FreeDialogData(dialog);
+            return NULL;
+        }
+
+        /* italic? */
+        ToPass = NCM.lfMessageFont.lfItalic;
+        if (!AddDialogData(dialog, &ToPass, 1)) {
+            FreeDialogData(dialog);
+            return NULL;
+        }
+
+        /* charset? */
+        ToPass = NCM.lfMessageFont.lfCharSet;
+        if (!AddDialogData(dialog, &ToPass, 1)) {
+            FreeDialogData(dialog);
+            return NULL;
+        }
+
+        /* font typeface. */
+        if (!AddDialogString(dialog, NCM.lfMessageFont.lfFaceName)) {
+            FreeDialogData(dialog);
+            return NULL;
+        }
+    }
+
+    return dialog;
+}
+
+/* Escaping ampersands is necessary to disable mnemonics in dialog controls.
+ * The caller provides a char** for dst and a size_t* for dstlen where the
+ * address of the work buffer and its size will be stored. Their values must be
+ * NULL and 0 on the first call. src is the string to be escaped. On error, the
+ * function returns NULL and, on success, returns a pointer to the escaped
+ * sequence as a read-only string that is valid until the next call or until the
+ * work buffer is freed. Once all strings have been processed, it's the caller's
+ * responsibilty to free the work buffer with SDL_free, even on errors.
+ */
+static const char *EscapeAmpersands(char **dst, size_t *dstlen, const char *src)
+{
+    char *newdst;
+    size_t ampcount = 0;
+    size_t srclen = 0;
+
+    if (src == NULL) {
+        return NULL;
+    }
+
+    while (src[srclen]) {
+        if (src[srclen] == '&') {
+            ampcount++;
+        }
+        srclen++;
+    }
+    srclen++;
+
+    if (ampcount == 0) {
+        /* Nothing to do. */
+        return src;
+    }
+    if (SIZE_MAX - srclen < ampcount) {
+        return NULL;
+    }
+    if (*dst == NULL || *dstlen < srclen + ampcount) {
+        /* Allocating extra space in case the next strings are a bit longer. */
+        size_t extraspace = SIZE_MAX - (srclen + ampcount);
+        if (extraspace > 512) {
+            extraspace = 512;
+        }
+        *dstlen = srclen + ampcount + extraspace;
+        SDL_free(*dst);
+        *dst = NULL;
+        newdst = SDL_malloc(*dstlen);
+        if (newdst == NULL) {
+            return NULL;
+        }
+        *dst = newdst;
+    } else {
+        newdst = *dst;
+    }
+
+    /* The escape character is the ampersand itself. */
+    while (srclen--) {
+        if (*src == '&') {
+            *newdst++ = '&';
+        }
+        *newdst++ = *src++;
+    }
+
+    return *dst;
+}
+
+/* This function is called if a Task Dialog is unsupported. */
+static int
+WIN_ShowOldMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
+{
+    WIN_DialogData *dialog;
+    int i, x, y, retval;
+    const SDL_MessageBoxButtonData *buttons = messageboxdata->buttons;
+    HFONT DialogFont;
+    SIZE Size;
+    RECT TextSize;
+    wchar_t* wmessage;
+    TEXTMETRIC TM;
+    HDC FontDC;
+    INT_PTR result;
+    char *ampescape = NULL;
+    size_t ampescapesize = 0;
+    Uint16 defbuttoncount = 0;
+    Uint16 icon = 0;
+
+    HWND ParentWindow = NULL;
+
+    const int ButtonWidth = 88;
+    const int ButtonHeight = 26;
+    const int TextMargin = 16;
+    const int ButtonMargin = 12;
+    const int IconWidth = GetSystemMetrics(SM_CXICON);
+    const int IconHeight = GetSystemMetrics(SM_CYICON);
+    const int IconMargin = 20;
+
+    if (messageboxdata->numbuttons > MAX_BUTTONS) {
+        return SDL_SetError("Number of butons exceeds limit of %d", MAX_BUTTONS);
+    }
+
+    switch (messageboxdata->flags) {
+    case SDL_MESSAGEBOX_ERROR:
+        icon = (Uint16)(size_t)IDI_ERROR;
+        break;
+    case SDL_MESSAGEBOX_WARNING:
+        icon = (Uint16)(size_t)IDI_WARNING;
+        break;
+    case SDL_MESSAGEBOX_INFORMATION:
+        icon = (Uint16)(size_t)IDI_INFORMATION;
+        break;
+    }
+
+    /* Jan 25th, 2013 - dant@fleetsa.com
+     *
+     *
+     * I've tried to make this more reasonable, but I've run in to a lot
+     * of nonsense.
+     *
+     * The original issue is the code was written in pixels and not
+     * dialog units (DLUs). All DialogBox functions use DLUs, which
+     * vary based on the selected font (yay).
+     *
+     * According to MSDN, the most reliable way to convert is via
+     * MapDialogUnits, which requires an HWND, which we don't have
+     * at time of template creation.
+     *
+     * We do however have:
+     *  The system font (DLU width 8 for me)
+     *  The font we select for the dialog (DLU width 6 for me)
+     *
+     * Based on experimentation, *neither* of these return the value
+     * actually used. Stepping in to MapDialogUnits(), the conversion
+     * is fairly clear, and uses 7 for me.
+     *
+     * As a result, some of this is hacky to ensure the sizing is
+     * somewhat correct.
+     *
+     * Honestly, a long term solution is to use CreateWindow, not CreateDialog.
+     *
+
+     *
+     * In order to get text dimensions we need to have a DC with the desired font.
+     * I'm assuming a dialog box in SDL is rare enough we can to the create.
+     */
+    FontDC = CreateCompatibleDC(0);
+
+    {
+        /* Create a duplicate of the font used in system message boxes. */
+        LOGFONT lf;
+        NONCLIENTMETRICS NCM;
+        NCM.cbSize = sizeof(NCM);
+        SystemParametersInfo(SPI_GETNONCLIENTMETRICS, 0, &NCM, 0);
+        lf = NCM.lfMessageFont;
+        DialogFont = CreateFontIndirect(&lf);
+    }
+
+    /* Select the font in to our DC */
+    SelectObject(FontDC, DialogFont);
+
+    {
+        /* Get the metrics to try and figure our DLU conversion. */
+        GetTextMetrics(FontDC, &TM);
+
+        /* Calculation from the following documentation:
+         * https://support.microsoft.com/en-gb/help/125681/how-to-calculate-dialog-base-units-with-non-system-based-font
+         * This fixes bug 2137, dialog box calculation with a fixed-width system font
+         */
+        {
+            SIZE extent;
+            GetTextExtentPoint32A(FontDC, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", 52, &extent);
+            s_BaseUnitsX = (extent.cx / 26 + 1) / 2;
+        }
+        /*s_BaseUnitsX = TM.tmAveCharWidth + 1;*/
+        s_BaseUnitsY = TM.tmHeight;
+    }
+
+    /* Measure the *pixel* size of the string. */
+    wmessage = WIN_UTF8ToString(messageboxdata->message);
+    SDL_zero(TextSize);
+    DrawText(FontDC, wmessage, -1, &TextSize, DT_CALCRECT | DT_LEFT | DT_NOPREFIX | DT_EDITCONTROL);
+
+    /* Add margins and some padding for hangs, etc. */
+    TextSize.left += TextMargin;
+    TextSize.right += TextMargin + 2;
+    TextSize.top += TextMargin;
+    TextSize.bottom += TextMargin + 2;
+
+    /* Done with the DC, and the string */
+    DeleteDC(FontDC);
+    SDL_free(wmessage);
+
+    /* Increase the size of the dialog by some border spacing around the text. */
+    Size.cx = TextSize.right - TextSize.left;
+    Size.cy = TextSize.bottom - TextSize.top;
+    Size.cx += TextMargin * 2;
+    Size.cy += TextMargin * 2;
+
+    /* Make dialog wider and shift text over for the icon. */
+    if (icon) {
+        Size.cx += IconMargin + IconWidth;
+        TextSize.left += IconMargin + IconWidth;
+        TextSize.right += IconMargin + IconWidth;
+    }
+
+    /* Ensure the size is wide enough for all of the buttons. */
+    if (Size.cx < messageboxdata->numbuttons * (ButtonWidth + ButtonMargin) + ButtonMargin)
+        Size.cx = messageboxdata->numbuttons * (ButtonWidth + ButtonMargin) + ButtonMargin;
+
+    /* Reset the height to the icon size if it is actually bigger than the text. */
+    if (icon && Size.cy < IconMargin * 2 + IconHeight) {
+        Size.cy = IconMargin * 2 + IconHeight;
+    }
+
+    /* Add vertical space for the buttons and border. */
+    Size.cy += ButtonHeight + TextMargin;
+
+    dialog = CreateDialogData(Size.cx, Size.cy, messageboxdata->title);
+    if (!dialog) {
+        return -1;
+    }
+
+    if (icon && ! AddDialogStaticIcon(dialog, IconMargin, IconMargin, IconWidth, IconHeight, icon)) {
+        FreeDialogData(dialog);
+        return -1;
+    }
+
+    if (!AddDialogStaticText(dialog, TextSize.left, TextSize.top, TextSize.right - TextSize.left, TextSize.bottom - TextSize.top, messageboxdata->message)) {
+        FreeDialogData(dialog);
+        return -1;
+    }
+
+    /* Align the buttons to the right/bottom. */
+    x = Size.cx - (ButtonWidth + ButtonMargin) * messageboxdata->numbuttons;
+    y = Size.cy - ButtonHeight - ButtonMargin;
+    for (i = messageboxdata->numbuttons - 1; i >= 0; --i) {
+        SDL_bool isdefault = SDL_FALSE;
+        const char *buttontext;
+
+        if (buttons[i].flags & SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT) {
+            defbuttoncount++;
+            if (defbuttoncount == 1) {
+                isdefault = SDL_TRUE;
+            }
+        }
+
+        buttontext = EscapeAmpersands(&ampescape, &ampescapesize, buttons[i].text);
+        if (buttontext == NULL || !AddDialogButton(dialog, x, y, ButtonWidth, ButtonHeight, buttontext, buttons[i].buttonid, isdefault)) {
+            FreeDialogData(dialog);
+            SDL_free(ampescape);
+            return -1;
+        }
+        x += ButtonWidth + ButtonMargin;
+    }
+    SDL_free(ampescape);
+
+    /* If we have a parent window, get the Instance and HWND for them
+     * so that our little dialog gets exclusive focus at all times. */
+    if (messageboxdata->window) {
+        ParentWindow = ((SDL_WindowData*)messageboxdata->window->driverdata)->hwnd;
+    }
+
+    result = DialogBoxIndirectParam(NULL, (DLGTEMPLATE*)dialog->lpDialog, ParentWindow, (DLGPROC)MessageBoxDialogProc, (LPARAM)messageboxdata);
+    if (result >= IDBUTTONINDEX0 && result - IDBUTTONINDEX0 < messageboxdata->numbuttons) {
+        *buttonid = messageboxdata->buttons[(messageboxdata->numbuttons - 1) - (result - IDBUTTONINDEX0)].buttonid;
+        retval = 0;
+    } else if (result == IDCLOSED) {
+        /* Dialog window closed by user or system. */
+        /* This could use a special return code. */
+        retval = 0;
+        *buttonid = -1;
+    } else {
+        if (result == 0) {
+            SDL_SetError("Invalid parent window handle");
+        } else if (result == -1) {
+            SDL_SetError("The message box encountered an error.");
+        } else if (result == IDINVALPTRINIT || result == IDINVALPTRSETFOCUS || result == IDINVALPTRCOMMAND) {
+            SDL_SetError("Invalid message box pointer in dialog procedure");
+        } else if (result == IDINVALPTRDLGITEM) {
+            SDL_SetError("Couldn't find dialog control of the default enter-key button");
+        } else {
+            SDL_SetError("An unknown error occured");
+        }
+        retval = -1;
+    }
+
+    FreeDialogData(dialog);
+    return retval;
+}
+
+/* TaskDialogIndirect procedure
+ * This is because SDL targets Windows XP (0x501), so this is not defined in the platform SDK.
+ */
+typedef HRESULT(FAR WINAPI *TASKDIALOGINDIRECTPROC)(const TASKDIALOGCONFIG *pTaskConfig, int *pnButton, int *pnRadioButton, BOOL *pfVerificationFlagChecked);
+
+int
+WIN_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
+{
+    HWND ParentWindow = NULL;
+    wchar_t *wmessage;
+    wchar_t *wtitle;
+    TASKDIALOGCONFIG TaskConfig;
+    TASKDIALOG_BUTTON *pButtons;
+    TASKDIALOG_BUTTON *pButton;
+    HMODULE hComctl32;
+    TASKDIALOGINDIRECTPROC pfnTaskDialogIndirect;
+    HRESULT hr;
+    char *ampescape = NULL;
+    size_t ampescapesize = 0;
+    int nButton;
+    int nCancelButton;
+    int i;
+
+    if (SIZE_MAX / sizeof(TASKDIALOG_BUTTON) < messageboxdata->numbuttons) {
+        return SDL_OutOfMemory();
+    }
+
+    /* If we cannot load comctl32.dll use the old messagebox! */
+    hComctl32 = LoadLibrary(TEXT("Comctl32.dll"));
+    if (hComctl32 == NULL) {
+        return WIN_ShowOldMessageBox(messageboxdata, buttonid);
+    }
+
+    /* If TaskDialogIndirect doesn't exist use the old messagebox!
+       This will fail prior to Windows Vista.
+       The manifest file in the application may require targeting version 6 of comctl32.dll, even
+       when we use LoadLibrary here!
+       If you don't want to bother with manifests, put this #pragma in your app's source code somewhere:
+       pragma comment(linker,"\"/manifestdependency:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0'  processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
+     */
+    pfnTaskDialogIndirect = (TASKDIALOGINDIRECTPROC) GetProcAddress(hComctl32, "TaskDialogIndirect");
+    if (pfnTaskDialogIndirect == NULL) {
+        FreeLibrary(hComctl32);
+        return WIN_ShowOldMessageBox(messageboxdata, buttonid);
+    }
+
+    /* If we have a parent window, get the Instance and HWND for them
+       so that our little dialog gets exclusive focus at all times. */
+    if (messageboxdata->window) {
+        ParentWindow = ((SDL_WindowData *) messageboxdata->window->driverdata)->hwnd;
+    }
+
+    wmessage = WIN_UTF8ToString(messageboxdata->message);
+    wtitle = WIN_UTF8ToString(messageboxdata->title);
+
+    SDL_zero(TaskConfig);
+    TaskConfig.cbSize = sizeof (TASKDIALOGCONFIG);
+    TaskConfig.hwndParent = ParentWindow;
+    TaskConfig.dwFlags = TDF_SIZE_TO_CONTENT;
+    TaskConfig.pszWindowTitle = wtitle;
+    if (messageboxdata->flags & SDL_MESSAGEBOX_ERROR) {
+        TaskConfig.pszMainIcon = TD_ERROR_ICON;
+    } else if (messageboxdata->flags & SDL_MESSAGEBOX_WARNING) {
+        TaskConfig.pszMainIcon = TD_WARNING_ICON;
+    } else if (messageboxdata->flags & SDL_MESSAGEBOX_INFORMATION) {
+        TaskConfig.pszMainIcon = TD_INFORMATION_ICON;
+    } else {
+        TaskConfig.pszMainIcon = NULL;
+    }
+
+    TaskConfig.pszContent = wmessage;
+    TaskConfig.cButtons = messageboxdata->numbuttons;
+    pButtons = SDL_malloc(sizeof (TASKDIALOG_BUTTON) * messageboxdata->numbuttons);
+    TaskConfig.nDefaultButton = 0;
+    nCancelButton = 0;
+    for (i = 0; i < messageboxdata->numbuttons; i++)
+    {
+        const char *buttontext;
+        pButton = &pButtons[messageboxdata->numbuttons-1-i];
+        if (messageboxdata->buttons[i].flags & SDL_MESSAGEBOX_BUTTON_ESCAPEKEY_DEFAULT) {
+            nCancelButton = messageboxdata->buttons[i].buttonid;
+            pButton->nButtonID = 2;
+        } else {
+            pButton->nButtonID = messageboxdata->buttons[i].buttonid + 1;
+            if (pButton->nButtonID >= 2) {
+                pButton->nButtonID++;
+            }
+        }
+        buttontext = EscapeAmpersands(&ampescape, &ampescapesize, messageboxdata->buttons[i].text);
+        if (buttontext == NULL) {
+            int j;
+            FreeLibrary(hComctl32);
+            SDL_free(ampescape);
+            SDL_free(wmessage);
+            SDL_free(wtitle);
+            for (j = 0; j < i; j++) {
+                SDL_free((wchar_t *) pButtons[j].pszButtonText);
+            }
+            SDL_free(pButtons);
+            return -1;
+        }
+        pButton->pszButtonText = WIN_UTF8ToString(buttontext);
+        if (messageboxdata->buttons[i].flags & SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT) {
+            TaskConfig.nDefaultButton = pButton->nButtonID;
+        }
+    }
+    TaskConfig.pButtons = pButtons;
+
+    /* Show the Task Dialog */
+    hr = pfnTaskDialogIndirect(&TaskConfig, &nButton, NULL, NULL);
+
+    /* Free everything */
+    FreeLibrary(hComctl32);
+    SDL_free(ampescape);
+    SDL_free(wmessage);
+    SDL_free(wtitle);
+    for (i = 0; i < messageboxdata->numbuttons; i++) {
+        SDL_free((wchar_t *) pButtons[i].pszButtonText);
+    }
+    SDL_free(pButtons);
+
+    /* Check the Task Dialog was successful and give the result */
+    if (SUCCEEDED(hr)) {
+        if (nButton == 2) {
+            *buttonid = nCancelButton;
+        } else if (nButton > 2) {
+            *buttonid = nButton-1-1;
+        } else {
+            *buttonid = nButton-1;
+        }
+        return 0;
+    }
+
+    /* We failed showing the Task Dialog, use the old message box! */
+    return WIN_ShowOldMessageBox(messageboxdata, buttonid);
+}
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsmessagebox.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmessagebox.h
new file mode 100644
index 0000000..2cb29be
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmessagebox.h
@@ -0,0 +1,29 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+extern int WIN_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid);
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsmodes.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmodes.c
new file mode 100644
index 0000000..7425d9a
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmodes.c
@@ -0,0 +1,407 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+#include "SDL_windowsvideo.h"
+#include "../../../include/SDL_assert.h"
+#include "../../../include/SDL_log.h"
+
+/* Windows CE compatibility */
+#ifndef CDS_FULLSCREEN
+#define CDS_FULLSCREEN 0
+#endif
+
+/* #define DEBUG_MODES */
+
+static void
+WIN_UpdateDisplayMode(_THIS, LPCTSTR deviceName, DWORD index, SDL_DisplayMode * mode)
+{
+    SDL_DisplayModeData *data = (SDL_DisplayModeData *) mode->driverdata;
+    HDC hdc;
+
+    data->DeviceMode.dmFields =
+        (DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT | DM_DISPLAYFREQUENCY |
+         DM_DISPLAYFLAGS);
+
+    if (index == ENUM_CURRENT_SETTINGS
+        && (hdc = CreateDC(deviceName, NULL, NULL, NULL)) != NULL) {
+        char bmi_data[sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD)];
+        LPBITMAPINFO bmi;
+        HBITMAP hbm;
+        int logical_width = GetDeviceCaps( hdc, HORZRES );
+        int logical_height = GetDeviceCaps( hdc, VERTRES );
+
+        mode->w = logical_width;
+        mode->h = logical_height;
+        
+        SDL_zero(bmi_data);
+        bmi = (LPBITMAPINFO) bmi_data;
+        bmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+
+        hbm = CreateCompatibleBitmap(hdc, 1, 1);
+        GetDIBits(hdc, hbm, 0, 1, NULL, bmi, DIB_RGB_COLORS);
+        GetDIBits(hdc, hbm, 0, 1, NULL, bmi, DIB_RGB_COLORS);
+        DeleteObject(hbm);
+        DeleteDC(hdc);
+        if (bmi->bmiHeader.biCompression == BI_BITFIELDS) {
+            switch (*(Uint32 *) bmi->bmiColors) {
+            case 0x00FF0000:
+                mode->format = SDL_PIXELFORMAT_RGB888;
+                break;
+            case 0x000000FF:
+                mode->format = SDL_PIXELFORMAT_BGR888;
+                break;
+            case 0xF800:
+                mode->format = SDL_PIXELFORMAT_RGB565;
+                break;
+            case 0x7C00:
+                mode->format = SDL_PIXELFORMAT_RGB555;
+                break;
+            }
+        } else if (bmi->bmiHeader.biBitCount == 8) {
+            mode->format = SDL_PIXELFORMAT_INDEX8;
+        } else if (bmi->bmiHeader.biBitCount == 4) {
+            mode->format = SDL_PIXELFORMAT_INDEX4LSB;
+        }
+    } else if (mode->format == SDL_PIXELFORMAT_UNKNOWN) {
+        /* FIXME: Can we tell what this will be? */
+        if ((data->DeviceMode.dmFields & DM_BITSPERPEL) == DM_BITSPERPEL) {
+            switch (data->DeviceMode.dmBitsPerPel) {
+            case 32:
+                mode->format = SDL_PIXELFORMAT_RGB888;
+                break;
+            case 24:
+                mode->format = SDL_PIXELFORMAT_RGB24;
+                break;
+            case 16:
+                mode->format = SDL_PIXELFORMAT_RGB565;
+                break;
+            case 15:
+                mode->format = SDL_PIXELFORMAT_RGB555;
+                break;
+            case 8:
+                mode->format = SDL_PIXELFORMAT_INDEX8;
+                break;
+            case 4:
+                mode->format = SDL_PIXELFORMAT_INDEX4LSB;
+                break;
+            }
+        }
+    }
+}
+
+static SDL_bool
+WIN_GetDisplayMode(_THIS, LPCTSTR deviceName, DWORD index, SDL_DisplayMode * mode)
+{
+    SDL_DisplayModeData *data;
+    DEVMODE devmode;
+
+    devmode.dmSize = sizeof(devmode);
+    devmode.dmDriverExtra = 0;
+    if (!EnumDisplaySettings(deviceName, index, &devmode)) {
+        return SDL_FALSE;
+    }
+
+    data = (SDL_DisplayModeData *) SDL_malloc(sizeof(*data));
+    if (!data) {
+        return SDL_FALSE;
+    }
+
+    mode->driverdata = data;
+    data->DeviceMode = devmode;
+
+    mode->format = SDL_PIXELFORMAT_UNKNOWN;
+    mode->w = data->DeviceMode.dmPelsWidth;
+    mode->h = data->DeviceMode.dmPelsHeight;
+    mode->refresh_rate = data->DeviceMode.dmDisplayFrequency;
+
+    /* Fill in the mode information */
+    WIN_UpdateDisplayMode(_this, deviceName, index, mode);
+    return SDL_TRUE;
+}
+
+static SDL_bool
+WIN_AddDisplay(_THIS, HMONITOR hMonitor, const MONITORINFOEX *info)
+{
+    SDL_VideoDisplay display;
+    SDL_DisplayData *displaydata;
+    SDL_DisplayMode mode;
+    DISPLAY_DEVICE device;
+
+#ifdef DEBUG_MODES
+    SDL_Log("Display: %s\n", WIN_StringToUTF8(info->szDevice));
+#endif
+
+    if (!WIN_GetDisplayMode(_this, info->szDevice, ENUM_CURRENT_SETTINGS, &mode)) {
+        return SDL_FALSE;
+    }
+
+    displaydata = (SDL_DisplayData *) SDL_malloc(sizeof(*displaydata));
+    if (!displaydata) {
+        return SDL_FALSE;
+    }
+    SDL_memcpy(displaydata->DeviceName, info->szDevice,
+               sizeof(displaydata->DeviceName));
+    displaydata->MonitorHandle = hMonitor;
+
+    SDL_zero(display);
+    device.cb = sizeof(device);
+    if (EnumDisplayDevices(info->szDevice, 0, &device, 0)) {
+        display.name = WIN_StringToUTF8(device.DeviceString);
+    }
+    display.desktop_mode = mode;
+    display.current_mode = mode;
+    display.driverdata = displaydata;
+    SDL_AddVideoDisplay(&display);
+    SDL_free(display.name);
+    return SDL_TRUE;
+}
+
+typedef struct _WIN_AddDisplaysData {
+    SDL_VideoDevice *video_device;
+    SDL_bool want_primary;
+} WIN_AddDisplaysData;
+
+static BOOL CALLBACK
+WIN_AddDisplaysCallback(HMONITOR hMonitor,
+                        HDC      hdcMonitor,
+                        LPRECT   lprcMonitor,
+                        LPARAM   dwData)
+{
+    WIN_AddDisplaysData *data = (WIN_AddDisplaysData*)dwData;
+    MONITORINFOEX info;
+
+    SDL_zero(info);
+    info.cbSize = sizeof(info);
+
+    if (GetMonitorInfo(hMonitor, (LPMONITORINFO)&info) != 0) {
+        const SDL_bool is_primary = ((info.dwFlags & MONITORINFOF_PRIMARY) == MONITORINFOF_PRIMARY);
+
+        if (is_primary == data->want_primary) {
+            WIN_AddDisplay(data->video_device, hMonitor, &info);
+        }
+    }
+
+    // continue enumeration
+    return TRUE;
+}
+
+static void
+WIN_AddDisplays(_THIS)
+{
+    WIN_AddDisplaysData callback_data;
+    callback_data.video_device = _this;
+
+    callback_data.want_primary = SDL_TRUE;
+    EnumDisplayMonitors(NULL, NULL, WIN_AddDisplaysCallback, (LPARAM)&callback_data);
+
+    callback_data.want_primary = SDL_FALSE;
+    EnumDisplayMonitors(NULL, NULL, WIN_AddDisplaysCallback, (LPARAM)&callback_data);
+}
+
+int
+WIN_InitModes(_THIS)
+{
+    WIN_AddDisplays(_this);
+
+    if (_this->num_displays == 0) {
+        return SDL_SetError("No displays available");
+    }
+    return 0;
+}
+
+int
+WIN_GetDisplayBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect)
+{
+    const SDL_DisplayData *data = (const SDL_DisplayData *)display->driverdata;
+    MONITORINFO minfo;
+    BOOL rc;
+
+    SDL_zero(minfo);
+    minfo.cbSize = sizeof(MONITORINFO);
+    rc = GetMonitorInfo(data->MonitorHandle, &minfo);
+
+    if (!rc) {
+        return SDL_SetError("Couldn't find monitor data");
+    }
+
+    rect->x = minfo.rcMonitor.left;
+    rect->y = minfo.rcMonitor.top;
+    rect->w = minfo.rcMonitor.right - minfo.rcMonitor.left;
+    rect->h = minfo.rcMonitor.bottom - minfo.rcMonitor.top;
+
+    return 0;
+}
+
+int
+WIN_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi_out, float * hdpi_out, float * vdpi_out)
+{
+    const SDL_DisplayData *displaydata = (SDL_DisplayData *)display->driverdata;
+    const SDL_VideoData *videodata = (SDL_VideoData *)display->device->driverdata;
+    float hdpi = 0, vdpi = 0, ddpi = 0;
+    
+    if (videodata->GetDpiForMonitor) {
+        UINT hdpi_uint, vdpi_uint;
+        // Windows 8.1+ codepath
+        if (videodata->GetDpiForMonitor(displaydata->MonitorHandle, MDT_EFFECTIVE_DPI, &hdpi_uint, &vdpi_uint) == S_OK) {
+            // GetDpiForMonitor docs promise to return the same hdpi/vdpi
+            hdpi = (float)hdpi_uint;
+            vdpi = (float)hdpi_uint;
+            ddpi = (float)hdpi_uint;
+        } else {
+            return SDL_SetError("GetDpiForMonitor failed");
+        }
+    } else {
+        // Window 8.0 and below: same DPI for all monitors.
+        HDC hdc;
+        int hdpi_int, vdpi_int, hpoints, vpoints, hpix, vpix;
+        float hinches, vinches;
+
+        hdc = GetDC(NULL);
+        if (hdc == NULL) {
+            return SDL_SetError("GetDC failed");
+        }
+        hdpi_int = GetDeviceCaps(hdc, LOGPIXELSX);
+        vdpi_int = GetDeviceCaps(hdc, LOGPIXELSY);
+        ReleaseDC(NULL, hdc);
+
+        hpoints = GetSystemMetrics(SM_CXVIRTUALSCREEN);
+        vpoints = GetSystemMetrics(SM_CYVIRTUALSCREEN);
+
+        hpix = MulDiv(hpoints, hdpi_int, 96);
+        vpix = MulDiv(vpoints, vdpi_int, 96);
+
+        hinches = (float)hpoints / 96.0f;
+        vinches = (float)vpoints / 96.0f;
+
+        hdpi = (float)hdpi_int;
+        vdpi = (float)vdpi_int;
+        ddpi = SDL_ComputeDiagonalDPI(hpix, vpix, hinches, vinches);
+    }
+
+    if (ddpi_out) {
+        *ddpi_out = ddpi;
+    }
+    if (hdpi_out) {
+        *hdpi_out = hdpi;
+    }
+    if (vdpi_out) {
+        *vdpi_out = vdpi;
+    }
+
+    return ddpi != 0.0f ? 0 : SDL_SetError("Couldn't get DPI");
+}
+
+int
+WIN_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect)
+{
+    const SDL_DisplayData *data = (const SDL_DisplayData *)display->driverdata;
+    MONITORINFO minfo;
+    BOOL rc;
+
+    SDL_zero(minfo);
+    minfo.cbSize = sizeof(MONITORINFO);
+    rc = GetMonitorInfo(data->MonitorHandle, &minfo);
+
+    if (!rc) {
+        return SDL_SetError("Couldn't find monitor data");
+    }
+
+    rect->x = minfo.rcWork.left;
+    rect->y = minfo.rcWork.top;
+    rect->w = minfo.rcWork.right - minfo.rcWork.left;
+    rect->h = minfo.rcWork.bottom - minfo.rcWork.top;
+
+    return 0;
+}
+
+void
+WIN_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
+{
+    SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;
+    DWORD i;
+    SDL_DisplayMode mode;
+
+    for (i = 0;; ++i) {
+        if (!WIN_GetDisplayMode(_this, data->DeviceName, i, &mode)) {
+            break;
+        }
+        if (SDL_ISPIXELFORMAT_INDEXED(mode.format)) {
+            /* We don't support palettized modes now */
+            SDL_free(mode.driverdata);
+            continue;
+        }
+        if (mode.format != SDL_PIXELFORMAT_UNKNOWN) {
+            if (!SDL_AddDisplayMode(display, &mode)) {
+                SDL_free(mode.driverdata);
+            }
+        } else {
+            SDL_free(mode.driverdata);
+        }
+    }
+}
+
+int
+WIN_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
+{
+    SDL_DisplayData *displaydata = (SDL_DisplayData *) display->driverdata;
+    SDL_DisplayModeData *data = (SDL_DisplayModeData *) mode->driverdata;
+    LONG status;
+
+    if (mode->driverdata == display->desktop_mode.driverdata) {
+        status = ChangeDisplaySettingsEx(displaydata->DeviceName, NULL, NULL, CDS_FULLSCREEN, NULL);
+    } else {
+        status = ChangeDisplaySettingsEx(displaydata->DeviceName, &data->DeviceMode, NULL, CDS_FULLSCREEN, NULL);
+    }
+    if (status != DISP_CHANGE_SUCCESSFUL) {
+        const char *reason = "Unknown reason";
+        switch (status) {
+        case DISP_CHANGE_BADFLAGS:
+            reason = "DISP_CHANGE_BADFLAGS";
+            break;
+        case DISP_CHANGE_BADMODE:
+            reason = "DISP_CHANGE_BADMODE";
+            break;
+        case DISP_CHANGE_BADPARAM:
+            reason = "DISP_CHANGE_BADPARAM";
+            break;
+        case DISP_CHANGE_FAILED:
+            reason = "DISP_CHANGE_FAILED";
+            break;
+        }
+        return SDL_SetError("ChangeDisplaySettingsEx() failed: %s", reason);
+    }
+    EnumDisplaySettings(displaydata->DeviceName, ENUM_CURRENT_SETTINGS, &data->DeviceMode);
+    WIN_UpdateDisplayMode(_this, displaydata->DeviceName, ENUM_CURRENT_SETTINGS, mode);
+    return 0;
+}
+
+void
+WIN_QuitModes(_THIS)
+{
+    /* All fullscreen windows should have restored modes by now */
+}
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsmodes.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmodes.h
new file mode 100644
index 0000000..a5c19b7
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmodes.h
@@ -0,0 +1,47 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_windowsmodes_h_
+#define SDL_windowsmodes_h_
+
+typedef struct
+{
+    TCHAR DeviceName[32];
+    HMONITOR MonitorHandle;
+} SDL_DisplayData;
+
+typedef struct
+{
+    DEVMODE DeviceMode;
+} SDL_DisplayModeData;
+
+extern int WIN_InitModes(_THIS);
+extern int WIN_GetDisplayBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect);
+extern int WIN_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect);
+extern int WIN_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi, float * hdpi, float * vdpi);
+extern void WIN_GetDisplayModes(_THIS, SDL_VideoDisplay * display);
+extern int WIN_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
+extern void WIN_QuitModes(_THIS);
+
+#endif /* SDL_windowsmodes_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsmouse.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmouse.c
new file mode 100644
index 0000000..eff3160
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmouse.c
@@ -0,0 +1,320 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+#include "SDL_assert.h"
+#include "SDL_windowsvideo.h"
+
+#include "../../events/SDL_mouse_c.h"
+
+
+HCURSOR SDL_cursor = NULL;
+
+static int rawInputEnableCount = 0;
+
+static int 
+ToggleRawInput(SDL_bool enabled)
+{
+    RAWINPUTDEVICE rawMouse = { 0x01, 0x02, 0, NULL }; /* Mouse: UsagePage = 1, Usage = 2 */
+
+    if (enabled) {
+        rawInputEnableCount++;
+        if (rawInputEnableCount > 1) {
+            return 0;  /* already done. */
+        }
+    } else {
+        if (rawInputEnableCount == 0) {
+            return 0;  /* already done. */
+        }
+        rawInputEnableCount--;
+        if (rawInputEnableCount > 0) {
+            return 0;  /* not time to disable yet */
+        }
+    }
+
+    if (!enabled) {
+        rawMouse.dwFlags |= RIDEV_REMOVE;
+    }
+
+    /* (Un)register raw input for mice */
+    if (RegisterRawInputDevices(&rawMouse, 1, sizeof(RAWINPUTDEVICE)) == FALSE) {
+
+        /* Only return an error when registering. If we unregister and fail,
+           then it's probably that we unregistered twice. That's OK. */
+        if (enabled) {
+            return SDL_Unsupported();
+        }
+    }
+    return 0;
+}
+
+
+static SDL_Cursor *
+WIN_CreateDefaultCursor()
+{
+    SDL_Cursor *cursor;
+
+    cursor = SDL_calloc(1, sizeof(*cursor));
+    if (cursor) {
+        cursor->driverdata = LoadCursor(NULL, IDC_ARROW);
+    } else {
+        SDL_OutOfMemory();
+    }
+
+    return cursor;
+}
+
+static SDL_Cursor *
+WIN_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)
+{
+    /* msdn says cursor mask has to be padded out to word alignment. Not sure
+        if that means machine word or WORD, but this handles either case. */
+    const size_t pad = (sizeof (size_t) * 8);  /* 32 or 64, or whatever. */
+    SDL_Cursor *cursor;
+    HICON hicon;
+    HDC hdc;
+    BITMAPV4HEADER bmh;
+    LPVOID pixels;
+    LPVOID maskbits;
+    size_t maskbitslen;
+    ICONINFO ii;
+
+    SDL_zero(bmh);
+    bmh.bV4Size = sizeof(bmh);
+    bmh.bV4Width = surface->w;
+    bmh.bV4Height = -surface->h; /* Invert the image */
+    bmh.bV4Planes = 1;
+    bmh.bV4BitCount = 32;
+    bmh.bV4V4Compression = BI_BITFIELDS;
+    bmh.bV4AlphaMask = 0xFF000000;
+    bmh.bV4RedMask   = 0x00FF0000;
+    bmh.bV4GreenMask = 0x0000FF00;
+    bmh.bV4BlueMask  = 0x000000FF;
+
+    maskbitslen = ((surface->w + (pad - (surface->w % pad))) / 8) * surface->h;
+    maskbits = SDL_stack_alloc(Uint8,maskbitslen);
+    if (maskbits == NULL) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+
+    /* AND the cursor against full bits: no change. We already have alpha. */
+    SDL_memset(maskbits, 0xFF, maskbitslen);
+
+    hdc = GetDC(NULL);
+    SDL_zero(ii);
+    ii.fIcon = FALSE;
+    ii.xHotspot = (DWORD)hot_x;
+    ii.yHotspot = (DWORD)hot_y;
+    ii.hbmColor = CreateDIBSection(hdc, (BITMAPINFO*)&bmh, DIB_RGB_COLORS, &pixels, NULL, 0);
+    ii.hbmMask = CreateBitmap(surface->w, surface->h, 1, 1, maskbits);
+    ReleaseDC(NULL, hdc);
+    SDL_stack_free(maskbits);
+
+    SDL_assert(surface->format->format == SDL_PIXELFORMAT_ARGB8888);
+    SDL_assert(surface->pitch == surface->w * 4);
+    SDL_memcpy(pixels, surface->pixels, surface->h * surface->pitch);
+
+    hicon = CreateIconIndirect(&ii);
+
+    DeleteObject(ii.hbmColor);
+    DeleteObject(ii.hbmMask);
+
+    if (!hicon) {
+        WIN_SetError("CreateIconIndirect()");
+        return NULL;
+    }
+
+    cursor = SDL_calloc(1, sizeof(*cursor));
+    if (cursor) {
+        cursor->driverdata = hicon;
+    } else {
+        DestroyIcon(hicon);
+        SDL_OutOfMemory();
+    }
+
+    return cursor;
+}
+
+static SDL_Cursor *
+WIN_CreateSystemCursor(SDL_SystemCursor id)
+{
+    SDL_Cursor *cursor;
+    LPCTSTR name;
+
+    switch(id)
+    {
+    default:
+        SDL_assert(0);
+        return NULL;
+    case SDL_SYSTEM_CURSOR_ARROW:     name = IDC_ARROW; break;
+    case SDL_SYSTEM_CURSOR_IBEAM:     name = IDC_IBEAM; break;
+    case SDL_SYSTEM_CURSOR_WAIT:      name = IDC_WAIT; break;
+    case SDL_SYSTEM_CURSOR_CROSSHAIR: name = IDC_CROSS; break;
+    case SDL_SYSTEM_CURSOR_WAITARROW: name = IDC_WAIT; break;
+    case SDL_SYSTEM_CURSOR_SIZENWSE:  name = IDC_SIZENWSE; break;
+    case SDL_SYSTEM_CURSOR_SIZENESW:  name = IDC_SIZENESW; break;
+    case SDL_SYSTEM_CURSOR_SIZEWE:    name = IDC_SIZEWE; break;
+    case SDL_SYSTEM_CURSOR_SIZENS:    name = IDC_SIZENS; break;
+    case SDL_SYSTEM_CURSOR_SIZEALL:   name = IDC_SIZEALL; break;
+    case SDL_SYSTEM_CURSOR_NO:        name = IDC_NO; break;
+    case SDL_SYSTEM_CURSOR_HAND:      name = IDC_HAND; break;
+    }
+
+    cursor = SDL_calloc(1, sizeof(*cursor));
+    if (cursor) {
+        HICON hicon;
+
+        hicon = LoadCursor(NULL, name);
+
+        cursor->driverdata = hicon;
+    } else {
+        SDL_OutOfMemory();
+    }
+
+    return cursor;
+}
+
+static void
+WIN_FreeCursor(SDL_Cursor * cursor)
+{
+    HICON hicon = (HICON)cursor->driverdata;
+
+    DestroyIcon(hicon);
+    SDL_free(cursor);
+}
+
+static int
+WIN_ShowCursor(SDL_Cursor * cursor)
+{
+    if (cursor) {
+        SDL_cursor = (HCURSOR)cursor->driverdata;
+    } else {
+        SDL_cursor = NULL;
+    }
+    if (SDL_GetMouseFocus() != NULL) {
+        SetCursor(SDL_cursor);
+    }
+    return 0;
+}
+
+static void
+WIN_WarpMouse(SDL_Window * window, int x, int y)
+{
+    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
+    HWND hwnd = data->hwnd;
+    POINT pt;
+
+    /* Don't warp the mouse while we're doing a modal interaction */
+    if (data->in_title_click || data->focus_click_pending) {
+        return;
+    }
+
+    pt.x = x;
+    pt.y = y;
+    ClientToScreen(hwnd, &pt);
+    SetCursorPos(pt.x, pt.y);
+}
+
+static int
+WIN_WarpMouseGlobal(int x, int y)
+{
+    POINT pt;
+
+    pt.x = x;
+    pt.y = y;
+    SetCursorPos(pt.x, pt.y);
+    return 0;
+}
+
+static int
+WIN_SetRelativeMouseMode(SDL_bool enabled)
+{
+    return ToggleRawInput(enabled);
+}
+
+static int
+WIN_CaptureMouse(SDL_Window *window)
+{
+    if (!window) {
+        SDL_Window *focusWin = SDL_GetKeyboardFocus();
+        if (focusWin) {
+            WIN_OnWindowEnter(SDL_GetVideoDevice(), focusWin);  /* make sure WM_MOUSELEAVE messages are (re)enabled. */
+        }
+    }
+
+    /* While we were thinking of SetCapture() when designing this API in SDL,
+       we didn't count on the fact that SetCapture() only tracks while the
+       left mouse button is held down! Instead, we listen for raw mouse input
+       and manually query the mouse when it leaves the window. :/ */
+    return ToggleRawInput(window != NULL);
+}
+
+static Uint32
+WIN_GetGlobalMouseState(int *x, int *y)
+{
+    Uint32 retval = 0;
+    POINT pt = { 0, 0 };
+    GetCursorPos(&pt);
+    *x = (int) pt.x;
+    *y = (int) pt.y;
+
+    retval |= GetAsyncKeyState(VK_LBUTTON) & 0x8000 ? SDL_BUTTON_LMASK : 0;
+    retval |= GetAsyncKeyState(VK_RBUTTON) & 0x8000 ? SDL_BUTTON_RMASK : 0;
+    retval |= GetAsyncKeyState(VK_MBUTTON) & 0x8000 ? SDL_BUTTON_MMASK : 0;
+    retval |= GetAsyncKeyState(VK_XBUTTON1) & 0x8000 ? SDL_BUTTON_X1MASK : 0;
+    retval |= GetAsyncKeyState(VK_XBUTTON2) & 0x8000 ? SDL_BUTTON_X2MASK : 0;
+
+    return retval;
+}
+
+void
+WIN_InitMouse(_THIS)
+{
+    SDL_Mouse *mouse = SDL_GetMouse();
+
+    mouse->CreateCursor = WIN_CreateCursor;
+    mouse->CreateSystemCursor = WIN_CreateSystemCursor;
+    mouse->ShowCursor = WIN_ShowCursor;
+    mouse->FreeCursor = WIN_FreeCursor;
+    mouse->WarpMouse = WIN_WarpMouse;
+    mouse->WarpMouseGlobal = WIN_WarpMouseGlobal;
+    mouse->SetRelativeMouseMode = WIN_SetRelativeMouseMode;
+    mouse->CaptureMouse = WIN_CaptureMouse;
+    mouse->GetGlobalMouseState = WIN_GetGlobalMouseState;
+
+    SDL_SetDefaultCursor(WIN_CreateDefaultCursor());
+}
+
+void
+WIN_QuitMouse(_THIS)
+{
+    if (rawInputEnableCount) {  /* force RAWINPUT off here. */
+        rawInputEnableCount = 1;
+        ToggleRawInput(SDL_FALSE);
+    }
+}
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsmouse.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmouse.h
new file mode 100644
index 0000000..775c32c
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsmouse.h
@@ -0,0 +1,33 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_windowsmouse_h_
+#define SDL_windowsmouse_h_
+
+extern HCURSOR SDL_cursor;
+
+extern void WIN_InitMouse(_THIS);
+extern void WIN_QuitMouse(_THIS);
+
+#endif /* SDL_windowsmouse_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengl.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengl.c
new file mode 100644
index 0000000..c3ba56c
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengl.c
@@ -0,0 +1,895 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+#include "SDL_assert.h"
+#include "SDL_loadso.h"
+#include "SDL_windowsvideo.h"
+#include "SDL_windowsopengles.h"
+#include "SDL_hints.h"
+
+/* WGL implementation of SDL OpenGL support */
+
+#if SDL_VIDEO_OPENGL_WGL
+#include "SDL_opengl.h"
+
+#define DEFAULT_OPENGL "OPENGL32.DLL"
+
+#ifndef WGL_ARB_create_context
+#define WGL_ARB_create_context
+#define WGL_CONTEXT_MAJOR_VERSION_ARB   0x2091
+#define WGL_CONTEXT_MINOR_VERSION_ARB   0x2092
+#define WGL_CONTEXT_LAYER_PLANE_ARB     0x2093
+#define WGL_CONTEXT_FLAGS_ARB           0x2094
+#define WGL_CONTEXT_DEBUG_BIT_ARB       0x0001
+#define WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB  0x0002
+
+#ifndef WGL_ARB_create_context_profile
+#define WGL_ARB_create_context_profile
+#define WGL_CONTEXT_PROFILE_MASK_ARB              0x9126
+#define WGL_CONTEXT_CORE_PROFILE_BIT_ARB          0x00000001
+#define WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB 0x00000002
+#endif
+
+#ifndef WGL_ARB_create_context_robustness
+#define WGL_ARB_create_context_robustness
+#define WGL_CONTEXT_ROBUST_ACCESS_BIT_ARB         0x00000004
+#define WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB     0x8256
+#define WGL_NO_RESET_NOTIFICATION_ARB                   0x8261
+#define WGL_LOSE_CONTEXT_ON_RESET_ARB                   0x8252
+#endif
+#endif
+
+#ifndef WGL_EXT_create_context_es2_profile
+#define WGL_EXT_create_context_es2_profile
+#define WGL_CONTEXT_ES2_PROFILE_BIT_EXT           0x00000004
+#endif
+
+#ifndef WGL_EXT_create_context_es_profile
+#define WGL_EXT_create_context_es_profile
+#define WGL_CONTEXT_ES_PROFILE_BIT_EXT            0x00000004
+#endif
+
+#ifndef WGL_ARB_framebuffer_sRGB
+#define WGL_ARB_framebuffer_sRGB
+#define WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB                0x20A9
+#endif
+
+#ifndef WGL_ARB_context_flush_control
+#define WGL_ARB_context_flush_control
+#define WGL_CONTEXT_RELEASE_BEHAVIOR_ARB   0x2097
+#define WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB           0x0000
+#define WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB          0x2098
+#endif
+
+#ifndef WGL_ARB_create_context_no_error
+#define WGL_ARB_create_context_no_error
+#define WGL_CONTEXT_OPENGL_NO_ERROR_ARB                 0x31B3
+#endif
+
+typedef HGLRC(APIENTRYP PFNWGLCREATECONTEXTATTRIBSARBPROC) (HDC hDC,
+                                                            HGLRC
+                                                            hShareContext,
+                                                            const int
+                                                            *attribList);
+
+int
+WIN_GL_LoadLibrary(_THIS, const char *path)
+{
+    void *handle;
+
+    if (path == NULL) {
+        path = SDL_getenv("SDL_OPENGL_LIBRARY");
+    }
+    if (path == NULL) {
+        path = DEFAULT_OPENGL;
+    }
+    _this->gl_config.dll_handle = SDL_LoadObject(path);
+    if (!_this->gl_config.dll_handle) {
+        return -1;
+    }
+    SDL_strlcpy(_this->gl_config.driver_path, path,
+                SDL_arraysize(_this->gl_config.driver_path));
+
+    /* Allocate OpenGL memory */
+    _this->gl_data = (struct SDL_GLDriverData *) SDL_calloc(1, sizeof(struct SDL_GLDriverData));
+    if (!_this->gl_data) {
+        return SDL_OutOfMemory();
+    }
+
+    /* Load function pointers */
+    handle = _this->gl_config.dll_handle;
+    _this->gl_data->wglGetProcAddress = (void *(WINAPI *) (const char *))
+        SDL_LoadFunction(handle, "wglGetProcAddress");
+    _this->gl_data->wglCreateContext = (HGLRC(WINAPI *) (HDC))
+        SDL_LoadFunction(handle, "wglCreateContext");
+    _this->gl_data->wglDeleteContext = (BOOL(WINAPI *) (HGLRC))
+        SDL_LoadFunction(handle, "wglDeleteContext");
+    _this->gl_data->wglMakeCurrent = (BOOL(WINAPI *) (HDC, HGLRC))
+        SDL_LoadFunction(handle, "wglMakeCurrent");
+    _this->gl_data->wglShareLists = (BOOL(WINAPI *) (HGLRC, HGLRC))
+        SDL_LoadFunction(handle, "wglShareLists");
+
+    if (!_this->gl_data->wglGetProcAddress ||
+        !_this->gl_data->wglCreateContext ||
+        !_this->gl_data->wglDeleteContext ||
+        !_this->gl_data->wglMakeCurrent) {
+        return SDL_SetError("Could not retrieve OpenGL functions");
+    }
+
+    /* XXX Too sleazy? WIN_GL_InitExtensions looks for certain OpenGL
+       extensions via SDL_GL_DeduceMaxSupportedESProfile. This uses
+       SDL_GL_ExtensionSupported which in turn calls SDL_GL_GetProcAddress.
+       However SDL_GL_GetProcAddress will fail if the library is not
+       loaded; it checks for gl_config.driver_loaded > 0. To avoid this
+       test failing, increment driver_loaded around the call to
+       WIN_GLInitExtensions.
+
+       Successful loading of the library is normally indicated by
+       SDL_GL_LoadLibrary incrementing driver_loaded immediately after
+       this function returns 0 to it.
+
+       Alternatives to this are:
+       - moving SDL_GL_DeduceMaxSupportedESProfile to both the WIN and
+         X11 platforms while adding a function equivalent to
+         SDL_GL_ExtensionSupported but which directly calls
+         glGetProcAddress(). Having 3 copies of the
+         SDL_GL_ExtensionSupported makes this alternative unattractive.
+       - moving SDL_GL_DeduceMaxSupportedESProfile to a new file shared
+         by the WIN and X11 platforms while adding a function equivalent
+         to SDL_GL_ExtensionSupported. This is unattractive due to the
+         number of project files that will need updating, plus there
+         will be 2 copies of the SDL_GL_ExtensionSupported code.
+       - Add a private equivalent of SDL_GL_ExtensionSupported to
+         SDL_video.c.
+       - Move the call to WIN_GL_InitExtensions back to WIN_CreateWindow
+         and add a flag to gl_data to avoid multiple calls to this
+         expensive function. This is probably the least objectionable
+         alternative if this increment/decrement trick is unacceptable.
+
+       Note that the driver_loaded > 0 check needs to remain in
+       SDL_GL_ExtensionSupported and SDL_GL_GetProcAddress as they are
+       public API functions.
+    */
+    ++_this->gl_config.driver_loaded;
+    WIN_GL_InitExtensions(_this);
+    --_this->gl_config.driver_loaded;
+
+    return 0;
+}
+
+void *
+WIN_GL_GetProcAddress(_THIS, const char *proc)
+{
+    void *func;
+
+    /* This is to pick up extensions */
+    func = _this->gl_data->wglGetProcAddress(proc);
+    if (!func) {
+        /* This is probably a normal GL function */
+        func = GetProcAddress(_this->gl_config.dll_handle, proc);
+    }
+    return func;
+}
+
+void
+WIN_GL_UnloadLibrary(_THIS)
+{
+    SDL_UnloadObject(_this->gl_config.dll_handle);
+    _this->gl_config.dll_handle = NULL;
+
+    /* Free OpenGL memory */
+    SDL_free(_this->gl_data);
+    _this->gl_data = NULL;
+}
+
+static void
+WIN_GL_SetupPixelFormat(_THIS, PIXELFORMATDESCRIPTOR * pfd)
+{
+    SDL_zerop(pfd);
+    pfd->nSize = sizeof(*pfd);
+    pfd->nVersion = 1;
+    pfd->dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL);
+    if (_this->gl_config.double_buffer) {
+        pfd->dwFlags |= PFD_DOUBLEBUFFER;
+    }
+    if (_this->gl_config.stereo) {
+        pfd->dwFlags |= PFD_STEREO;
+    }
+    pfd->iLayerType = PFD_MAIN_PLANE;
+    pfd->iPixelType = PFD_TYPE_RGBA;
+    pfd->cRedBits = _this->gl_config.red_size;
+    pfd->cGreenBits = _this->gl_config.green_size;
+    pfd->cBlueBits = _this->gl_config.blue_size;
+    pfd->cAlphaBits = _this->gl_config.alpha_size;
+    if (_this->gl_config.buffer_size) {
+        pfd->cColorBits =
+            _this->gl_config.buffer_size - _this->gl_config.alpha_size;
+    } else {
+        pfd->cColorBits = (pfd->cRedBits + pfd->cGreenBits + pfd->cBlueBits);
+    }
+    pfd->cAccumRedBits = _this->gl_config.accum_red_size;
+    pfd->cAccumGreenBits = _this->gl_config.accum_green_size;
+    pfd->cAccumBlueBits = _this->gl_config.accum_blue_size;
+    pfd->cAccumAlphaBits = _this->gl_config.accum_alpha_size;
+    pfd->cAccumBits =
+        (pfd->cAccumRedBits + pfd->cAccumGreenBits + pfd->cAccumBlueBits +
+         pfd->cAccumAlphaBits);
+    pfd->cDepthBits = _this->gl_config.depth_size;
+    pfd->cStencilBits = _this->gl_config.stencil_size;
+}
+
+/* Choose the closest pixel format that meets or exceeds the target.
+   FIXME: Should we weight any particular attribute over any other?
+*/
+static int
+WIN_GL_ChoosePixelFormat(HDC hdc, PIXELFORMATDESCRIPTOR * target)
+{
+    PIXELFORMATDESCRIPTOR pfd;
+    int count, index, best = 0;
+    unsigned int dist, best_dist = ~0U;
+
+    count = DescribePixelFormat(hdc, 1, sizeof(pfd), NULL);
+
+    for (index = 1; index <= count; index++) {
+
+        if (!DescribePixelFormat(hdc, index, sizeof(pfd), &pfd)) {
+            continue;
+        }
+
+        if ((pfd.dwFlags & target->dwFlags) != target->dwFlags) {
+            continue;
+        }
+
+        if (pfd.iLayerType != target->iLayerType) {
+            continue;
+        }
+        if (pfd.iPixelType != target->iPixelType) {
+            continue;
+        }
+
+        dist = 0;
+
+        if (pfd.cColorBits < target->cColorBits) {
+            continue;
+        } else {
+            dist += (pfd.cColorBits - target->cColorBits);
+        }
+        if (pfd.cRedBits < target->cRedBits) {
+            continue;
+        } else {
+            dist += (pfd.cRedBits - target->cRedBits);
+        }
+        if (pfd.cGreenBits < target->cGreenBits) {
+            continue;
+        } else {
+            dist += (pfd.cGreenBits - target->cGreenBits);
+        }
+        if (pfd.cBlueBits < target->cBlueBits) {
+            continue;
+        } else {
+            dist += (pfd.cBlueBits - target->cBlueBits);
+        }
+        if (pfd.cAlphaBits < target->cAlphaBits) {
+            continue;
+        } else {
+            dist += (pfd.cAlphaBits - target->cAlphaBits);
+        }
+        if (pfd.cAccumBits < target->cAccumBits) {
+            continue;
+        } else {
+            dist += (pfd.cAccumBits - target->cAccumBits);
+        }
+        if (pfd.cAccumRedBits < target->cAccumRedBits) {
+            continue;
+        } else {
+            dist += (pfd.cAccumRedBits - target->cAccumRedBits);
+        }
+        if (pfd.cAccumGreenBits < target->cAccumGreenBits) {
+            continue;
+        } else {
+            dist += (pfd.cAccumGreenBits - target->cAccumGreenBits);
+        }
+        if (pfd.cAccumBlueBits < target->cAccumBlueBits) {
+            continue;
+        } else {
+            dist += (pfd.cAccumBlueBits - target->cAccumBlueBits);
+        }
+        if (pfd.cAccumAlphaBits < target->cAccumAlphaBits) {
+            continue;
+        } else {
+            dist += (pfd.cAccumAlphaBits - target->cAccumAlphaBits);
+        }
+        if (pfd.cDepthBits < target->cDepthBits) {
+            continue;
+        } else {
+            dist += (pfd.cDepthBits - target->cDepthBits);
+        }
+        if (pfd.cStencilBits < target->cStencilBits) {
+            continue;
+        } else {
+            dist += (pfd.cStencilBits - target->cStencilBits);
+        }
+
+        if (dist < best_dist) {
+            best = index;
+            best_dist = dist;
+        }
+    }
+
+    return best;
+}
+
+static SDL_bool
+HasExtension(const char *extension, const char *extensions)
+{
+    const char *start;
+    const char *where, *terminator;
+
+    /* Extension names should not have spaces. */
+    where = SDL_strchr(extension, ' ');
+    if (where || *extension == '\0')
+        return SDL_FALSE;
+
+    if (!extensions)
+        return SDL_FALSE;
+
+    /* It takes a bit of care to be fool-proof about parsing the
+     * OpenGL extensions string. Don't be fooled by sub-strings,
+     * etc. */
+
+    start = extensions;
+
+    for (;;) {
+        where = SDL_strstr(start, extension);
+        if (!where)
+            break;
+
+        terminator = where + SDL_strlen(extension);
+        if (where == start || *(where - 1) == ' ')
+            if (*terminator == ' ' || *terminator == '\0')
+                return SDL_TRUE;
+
+        start = terminator;
+    }
+    return SDL_FALSE;
+}
+
+void
+WIN_GL_InitExtensions(_THIS)
+{
+    const char *(WINAPI * wglGetExtensionsStringARB) (HDC) = 0;
+    const char *extensions;
+    HWND hwnd;
+    HDC hdc;
+    HGLRC hglrc;
+    PIXELFORMATDESCRIPTOR pfd;
+
+    if (!_this->gl_data) {
+        return;
+    }
+
+    hwnd =
+        CreateWindow(SDL_Appname, SDL_Appname, (WS_POPUP | WS_DISABLED), 0, 0,
+        10, 10, NULL, NULL, SDL_Instance, NULL);
+    if (!hwnd) {
+        return;
+    }
+    WIN_PumpEvents(_this);
+
+    hdc = GetDC(hwnd);
+
+    WIN_GL_SetupPixelFormat(_this, &pfd);
+
+    SetPixelFormat(hdc, ChoosePixelFormat(hdc, &pfd), &pfd);
+
+    hglrc = _this->gl_data->wglCreateContext(hdc);
+    if (!hglrc) {
+        return;
+    }
+    _this->gl_data->wglMakeCurrent(hdc, hglrc);
+
+    wglGetExtensionsStringARB = (const char *(WINAPI *) (HDC))
+        _this->gl_data->wglGetProcAddress("wglGetExtensionsStringARB");
+    if (wglGetExtensionsStringARB) {
+        extensions = wglGetExtensionsStringARB(hdc);
+    } else {
+        extensions = NULL;
+    }
+
+    /* Check for WGL_ARB_pixel_format */
+    _this->gl_data->HAS_WGL_ARB_pixel_format = SDL_FALSE;
+    if (HasExtension("WGL_ARB_pixel_format", extensions)) {
+        _this->gl_data->wglChoosePixelFormatARB = (BOOL(WINAPI *)
+                                                   (HDC, const int *,
+                                                    const FLOAT *, UINT,
+                                                    int *, UINT *))
+            WIN_GL_GetProcAddress(_this, "wglChoosePixelFormatARB");
+        _this->gl_data->wglGetPixelFormatAttribivARB =
+            (BOOL(WINAPI *) (HDC, int, int, UINT, const int *, int *))
+            WIN_GL_GetProcAddress(_this, "wglGetPixelFormatAttribivARB");
+
+        if ((_this->gl_data->wglChoosePixelFormatARB != NULL) &&
+            (_this->gl_data->wglGetPixelFormatAttribivARB != NULL)) {
+            _this->gl_data->HAS_WGL_ARB_pixel_format = SDL_TRUE;
+        }
+    }
+
+    /* Check for WGL_EXT_swap_control */
+    _this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_FALSE;
+    if (HasExtension("WGL_EXT_swap_control", extensions)) {
+        _this->gl_data->wglSwapIntervalEXT =
+            WIN_GL_GetProcAddress(_this, "wglSwapIntervalEXT");
+        _this->gl_data->wglGetSwapIntervalEXT =
+            WIN_GL_GetProcAddress(_this, "wglGetSwapIntervalEXT");
+        if (HasExtension("WGL_EXT_swap_control_tear", extensions)) {
+            _this->gl_data->HAS_WGL_EXT_swap_control_tear = SDL_TRUE;
+        }
+    } else {
+        _this->gl_data->wglSwapIntervalEXT = NULL;
+        _this->gl_data->wglGetSwapIntervalEXT = NULL;
+    }
+
+    /* Check for WGL_EXT_create_context_es2_profile */
+    if (HasExtension("WGL_EXT_create_context_es2_profile", extensions)) {
+        SDL_GL_DeduceMaxSupportedESProfile(
+            &_this->gl_data->es_profile_max_supported_version.major,
+            &_this->gl_data->es_profile_max_supported_version.minor
+        );
+    }
+
+    /* Check for WGL_ARB_context_flush_control */
+    if (HasExtension("WGL_ARB_context_flush_control", extensions)) {
+        _this->gl_data->HAS_WGL_ARB_context_flush_control = SDL_TRUE;
+    }
+
+    /* Check for WGL_ARB_create_context_robustness */
+    if (HasExtension("WGL_ARB_create_context_robustness", extensions)) {
+        _this->gl_data->HAS_WGL_ARB_create_context_robustness = SDL_TRUE;
+    }
+
+    /* Check for WGL_ARB_create_context_no_error */
+    if (HasExtension("WGL_ARB_create_context_no_error", extensions)) {
+        _this->gl_data->HAS_WGL_ARB_create_context_no_error = SDL_TRUE;
+    }
+
+    _this->gl_data->wglMakeCurrent(hdc, NULL);
+    _this->gl_data->wglDeleteContext(hglrc);
+    ReleaseDC(hwnd, hdc);
+    DestroyWindow(hwnd);
+    WIN_PumpEvents(_this);
+}
+
+static int
+WIN_GL_ChoosePixelFormatARB(_THIS, int *iAttribs, float *fAttribs)
+{
+    HWND hwnd;
+    HDC hdc;
+    PIXELFORMATDESCRIPTOR pfd;
+    HGLRC hglrc;
+    int pixel_format = 0;
+    unsigned int matching;
+
+    hwnd =
+        CreateWindow(SDL_Appname, SDL_Appname, (WS_POPUP | WS_DISABLED), 0, 0,
+                     10, 10, NULL, NULL, SDL_Instance, NULL);
+    WIN_PumpEvents(_this);
+
+    hdc = GetDC(hwnd);
+
+    WIN_GL_SetupPixelFormat(_this, &pfd);
+
+    SetPixelFormat(hdc, ChoosePixelFormat(hdc, &pfd), &pfd);
+
+    hglrc = _this->gl_data->wglCreateContext(hdc);
+    if (hglrc) {
+        _this->gl_data->wglMakeCurrent(hdc, hglrc);
+
+        if (_this->gl_data->HAS_WGL_ARB_pixel_format) {
+            _this->gl_data->wglChoosePixelFormatARB(hdc, iAttribs, fAttribs,
+                                                    1, &pixel_format,
+                                                    &matching);
+        }
+
+        _this->gl_data->wglMakeCurrent(hdc, NULL);
+        _this->gl_data->wglDeleteContext(hglrc);
+    }
+    ReleaseDC(hwnd, hdc);
+    DestroyWindow(hwnd);
+    WIN_PumpEvents(_this);
+
+    return pixel_format;
+}
+
+/* actual work of WIN_GL_SetupWindow() happens here. */
+static int
+WIN_GL_SetupWindowInternal(_THIS, SDL_Window * window)
+{
+    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
+    PIXELFORMATDESCRIPTOR pfd;
+    int pixel_format = 0;
+    int iAttribs[64];
+    int *iAttr;
+    int *iAccelAttr;
+    float fAttribs[1] = { 0 };
+
+    WIN_GL_SetupPixelFormat(_this, &pfd);
+
+    /* setup WGL_ARB_pixel_format attribs */
+    iAttr = &iAttribs[0];
+
+    *iAttr++ = WGL_DRAW_TO_WINDOW_ARB;
+    *iAttr++ = GL_TRUE;
+    *iAttr++ = WGL_RED_BITS_ARB;
+    *iAttr++ = _this->gl_config.red_size;
+    *iAttr++ = WGL_GREEN_BITS_ARB;
+    *iAttr++ = _this->gl_config.green_size;
+    *iAttr++ = WGL_BLUE_BITS_ARB;
+    *iAttr++ = _this->gl_config.blue_size;
+
+    if (_this->gl_config.alpha_size) {
+        *iAttr++ = WGL_ALPHA_BITS_ARB;
+        *iAttr++ = _this->gl_config.alpha_size;
+    }
+
+    *iAttr++ = WGL_DOUBLE_BUFFER_ARB;
+    *iAttr++ = _this->gl_config.double_buffer;
+
+    *iAttr++ = WGL_DEPTH_BITS_ARB;
+    *iAttr++ = _this->gl_config.depth_size;
+
+    if (_this->gl_config.stencil_size) {
+        *iAttr++ = WGL_STENCIL_BITS_ARB;
+        *iAttr++ = _this->gl_config.stencil_size;
+    }
+
+    if (_this->gl_config.accum_red_size) {
+        *iAttr++ = WGL_ACCUM_RED_BITS_ARB;
+        *iAttr++ = _this->gl_config.accum_red_size;
+    }
+
+    if (_this->gl_config.accum_green_size) {
+        *iAttr++ = WGL_ACCUM_GREEN_BITS_ARB;
+        *iAttr++ = _this->gl_config.accum_green_size;
+    }
+
+    if (_this->gl_config.accum_blue_size) {
+        *iAttr++ = WGL_ACCUM_BLUE_BITS_ARB;
+        *iAttr++ = _this->gl_config.accum_blue_size;
+    }
+
+    if (_this->gl_config.accum_alpha_size) {
+        *iAttr++ = WGL_ACCUM_ALPHA_BITS_ARB;
+        *iAttr++ = _this->gl_config.accum_alpha_size;
+    }
+
+    if (_this->gl_config.stereo) {
+        *iAttr++ = WGL_STEREO_ARB;
+        *iAttr++ = GL_TRUE;
+    }
+
+    if (_this->gl_config.multisamplebuffers) {
+        *iAttr++ = WGL_SAMPLE_BUFFERS_ARB;
+        *iAttr++ = _this->gl_config.multisamplebuffers;
+    }
+
+    if (_this->gl_config.multisamplesamples) {
+        *iAttr++ = WGL_SAMPLES_ARB;
+        *iAttr++ = _this->gl_config.multisamplesamples;
+    }
+
+    if (_this->gl_config.framebuffer_srgb_capable) {
+        *iAttr++ = WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB;
+        *iAttr++ = _this->gl_config.framebuffer_srgb_capable;
+    }
+
+    /* We always choose either FULL or NO accel on Windows, because of flaky
+       drivers. If the app didn't specify, we use FULL, because that's
+       probably what they wanted (and if you didn't care and got FULL, that's
+       a perfectly valid result in any case). */
+    *iAttr++ = WGL_ACCELERATION_ARB;
+    iAccelAttr = iAttr;
+    if (_this->gl_config.accelerated) {
+        *iAttr++ = WGL_FULL_ACCELERATION_ARB;
+    } else {
+        *iAttr++ = WGL_NO_ACCELERATION_ARB;
+    }
+
+    *iAttr = 0;
+
+    /* Choose and set the closest available pixel format */
+    pixel_format = WIN_GL_ChoosePixelFormatARB(_this, iAttribs, fAttribs);
+
+    /* App said "don't care about accel" and FULL accel failed. Try NO. */
+    if ( ( !pixel_format ) && ( _this->gl_config.accelerated < 0 ) ) {
+        *iAccelAttr = WGL_NO_ACCELERATION_ARB;
+        pixel_format = WIN_GL_ChoosePixelFormatARB(_this, iAttribs, fAttribs);
+        *iAccelAttr = WGL_FULL_ACCELERATION_ARB;  /* if we try again. */
+    }
+    if (!pixel_format) {
+        pixel_format = WIN_GL_ChoosePixelFormat(hdc, &pfd);
+    }
+    if (!pixel_format) {
+        return SDL_SetError("No matching GL pixel format available");
+    }
+    if (!SetPixelFormat(hdc, pixel_format, &pfd)) {
+        return WIN_SetError("SetPixelFormat()");
+    }
+    return 0;
+}
+
+int
+WIN_GL_SetupWindow(_THIS, SDL_Window * window)
+{
+    /* The current context is lost in here; save it and reset it. */
+    SDL_Window *current_win = SDL_GL_GetCurrentWindow();
+    SDL_GLContext current_ctx = SDL_GL_GetCurrentContext();
+    const int retval = WIN_GL_SetupWindowInternal(_this, window);
+    WIN_GL_MakeCurrent(_this, current_win, current_ctx);
+    return retval;
+}
+
+SDL_bool
+WIN_GL_UseEGL(_THIS)
+{
+    SDL_assert(_this->gl_data != NULL);
+    SDL_assert(_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES);
+
+    return (SDL_GetHintBoolean(SDL_HINT_OPENGL_ES_DRIVER, SDL_FALSE)
+            || _this->gl_config.major_version == 1 /* No WGL extension for OpenGL ES 1.x profiles. */
+            || _this->gl_config.major_version > _this->gl_data->es_profile_max_supported_version.major
+            || (_this->gl_config.major_version == _this->gl_data->es_profile_max_supported_version.major
+                && _this->gl_config.minor_version > _this->gl_data->es_profile_max_supported_version.minor));
+}
+
+SDL_GLContext
+WIN_GL_CreateContext(_THIS, SDL_Window * window)
+{
+    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
+    HGLRC context, share_context;
+
+    if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES && WIN_GL_UseEGL(_this)) {
+#if SDL_VIDEO_OPENGL_EGL        
+        /* Switch to EGL based functions */
+        WIN_GL_UnloadLibrary(_this);
+        _this->GL_LoadLibrary = WIN_GLES_LoadLibrary;
+        _this->GL_GetProcAddress = WIN_GLES_GetProcAddress;
+        _this->GL_UnloadLibrary = WIN_GLES_UnloadLibrary;
+        _this->GL_CreateContext = WIN_GLES_CreateContext;
+        _this->GL_MakeCurrent = WIN_GLES_MakeCurrent;
+        _this->GL_SetSwapInterval = WIN_GLES_SetSwapInterval;
+        _this->GL_GetSwapInterval = WIN_GLES_GetSwapInterval;
+        _this->GL_SwapWindow = WIN_GLES_SwapWindow;
+        _this->GL_DeleteContext = WIN_GLES_DeleteContext;
+        
+        if (WIN_GLES_LoadLibrary(_this, NULL) != 0) {
+            return NULL;
+        }
+        
+        return WIN_GLES_CreateContext(_this, window);
+#else
+        SDL_SetError("SDL not configured with EGL support");
+        return NULL;
+#endif
+    }
+
+    if (_this->gl_config.share_with_current_context) {
+        share_context = (HGLRC)SDL_GL_GetCurrentContext();
+    } else {
+        share_context = 0;
+    }
+
+    if (_this->gl_config.major_version < 3 &&
+        _this->gl_config.profile_mask == 0 &&
+        _this->gl_config.flags == 0) {
+        /* Create legacy context */
+        context = _this->gl_data->wglCreateContext(hdc);
+        if( share_context != 0 ) {
+            _this->gl_data->wglShareLists(share_context, context);
+        }
+    } else {
+        PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB;
+        HGLRC temp_context = _this->gl_data->wglCreateContext(hdc);
+        if (!temp_context) {
+            SDL_SetError("Could not create GL context");
+            return NULL;
+        }
+
+        /* Make the context current */
+        if (WIN_GL_MakeCurrent(_this, window, temp_context) < 0) {
+            WIN_GL_DeleteContext(_this, temp_context);
+            return NULL;
+        }
+
+        wglCreateContextAttribsARB =
+            (PFNWGLCREATECONTEXTATTRIBSARBPROC) _this->gl_data->
+            wglGetProcAddress("wglCreateContextAttribsARB");
+        if (!wglCreateContextAttribsARB) {
+            SDL_SetError("GL 3.x is not supported");
+            context = temp_context;
+        } else {
+            int attribs[15];  /* max 14 attributes plus terminator */
+            int iattr = 0;
+
+            attribs[iattr++] = WGL_CONTEXT_MAJOR_VERSION_ARB;
+            attribs[iattr++] = _this->gl_config.major_version;
+            attribs[iattr++] = WGL_CONTEXT_MINOR_VERSION_ARB;
+            attribs[iattr++] = _this->gl_config.minor_version;
+
+            /* SDL profile bits match WGL profile bits */
+            if (_this->gl_config.profile_mask != 0) {
+                attribs[iattr++] = WGL_CONTEXT_PROFILE_MASK_ARB;
+                attribs[iattr++] = _this->gl_config.profile_mask;
+            }
+
+            /* SDL flags match WGL flags */
+            if (_this->gl_config.flags != 0) {
+                attribs[iattr++] = WGL_CONTEXT_FLAGS_ARB;
+                attribs[iattr++] = _this->gl_config.flags;
+            }
+
+            /* only set if wgl extension is available */
+            if (_this->gl_data->HAS_WGL_ARB_context_flush_control) {
+                attribs[iattr++] = WGL_CONTEXT_RELEASE_BEHAVIOR_ARB;
+                attribs[iattr++] = _this->gl_config.release_behavior ?
+                                    WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB :
+                                    WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB;
+            }
+
+            /* only set if wgl extension is available */
+            if (_this->gl_data->HAS_WGL_ARB_create_context_robustness) {
+                attribs[iattr++] = WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB;
+                attribs[iattr++] = _this->gl_config.reset_notification ?
+                                    WGL_LOSE_CONTEXT_ON_RESET_ARB :
+                                    WGL_NO_RESET_NOTIFICATION_ARB;
+            }
+
+            /* only set if wgl extension is available */
+            if (_this->gl_data->HAS_WGL_ARB_create_context_no_error) {
+                attribs[iattr++] = WGL_CONTEXT_OPENGL_NO_ERROR_ARB;
+                attribs[iattr++] = _this->gl_config.no_error;
+            }
+
+            attribs[iattr++] = 0;
+
+            /* Create the GL 3.x context */
+            context = wglCreateContextAttribsARB(hdc, share_context, attribs);
+            /* Delete the GL 2.x context */
+            _this->gl_data->wglDeleteContext(temp_context);
+        }
+    }
+
+    if (!context) {
+        WIN_SetError("Could not create GL context");
+        return NULL;
+    }
+
+    if (WIN_GL_MakeCurrent(_this, window, context) < 0) {
+        WIN_GL_DeleteContext(_this, context);
+        return NULL;
+    }
+
+    return context;
+}
+
+int
+WIN_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
+{
+    HDC hdc;
+
+    if (!_this->gl_data) {
+        return SDL_SetError("OpenGL not initialized");
+    }
+
+    /* sanity check that higher level handled this. */
+    SDL_assert(window || (!window && !context));
+
+    /* Some Windows drivers freak out if hdc is NULL, even when context is
+       NULL, against spec. Since hdc is _supposed_ to be ignored if context
+       is NULL, we either use the current GL window, or do nothing if we
+       already have no current context. */
+    if (!window) {
+        window = SDL_GL_GetCurrentWindow();
+        if (!window) {
+            SDL_assert(SDL_GL_GetCurrentContext() == NULL);
+            return 0;  /* already done. */
+        }
+    }
+
+    hdc = ((SDL_WindowData *) window->driverdata)->hdc;
+    if (!_this->gl_data->wglMakeCurrent(hdc, (HGLRC) context)) {
+        return WIN_SetError("wglMakeCurrent()");
+    }
+    return 0;
+}
+
+int
+WIN_GL_SetSwapInterval(_THIS, int interval)
+{
+    if ((interval < 0) && (!_this->gl_data->HAS_WGL_EXT_swap_control_tear)) {
+        return SDL_SetError("Negative swap interval unsupported in this GL");
+    } else if (_this->gl_data->wglSwapIntervalEXT) {
+        if (_this->gl_data->wglSwapIntervalEXT(interval) != TRUE) {
+            return WIN_SetError("wglSwapIntervalEXT()");
+        }
+    } else {
+        return SDL_Unsupported();
+    }
+    return 0;
+}
+
+int
+WIN_GL_GetSwapInterval(_THIS)
+{
+    int retval = 0;
+    if (_this->gl_data->wglGetSwapIntervalEXT) {
+        retval = _this->gl_data->wglGetSwapIntervalEXT();
+    }
+    return retval;
+}
+
+int
+WIN_GL_SwapWindow(_THIS, SDL_Window * window)
+{
+    HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
+
+    if (!SwapBuffers(hdc)) {
+        return WIN_SetError("SwapBuffers()");
+    }
+    return 0;
+}
+
+void
+WIN_GL_DeleteContext(_THIS, SDL_GLContext context)
+{
+    if (!_this->gl_data) {
+        return;
+    }
+    _this->gl_data->wglDeleteContext((HGLRC) context);
+}
+
+
+SDL_bool
+WIN_GL_SetPixelFormatFrom(_THIS, SDL_Window * fromWindow, SDL_Window * toWindow)
+{
+    HDC hfromdc = ((SDL_WindowData *) fromWindow->driverdata)->hdc;
+    HDC htodc = ((SDL_WindowData *) toWindow->driverdata)->hdc;
+    BOOL result;
+
+    /* get the pixel format of the fromWindow */
+    int pixel_format = GetPixelFormat(hfromdc);
+    PIXELFORMATDESCRIPTOR pfd;
+    SDL_memset(&pfd, 0, sizeof(pfd));
+    DescribePixelFormat(hfromdc, pixel_format, sizeof(pfd), &pfd);
+
+    /* set the pixel format of the toWindow */
+    result = SetPixelFormat(htodc, pixel_format, &pfd);
+
+    return result ? SDL_TRUE : SDL_FALSE;
+}
+
+#endif /* SDL_VIDEO_OPENGL_WGL */
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengl.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengl.h
new file mode 100644
index 0000000..8704411
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengl.h
@@ -0,0 +1,142 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_windowsopengl_h_
+#define SDL_windowsopengl_h_
+
+#if SDL_VIDEO_OPENGL_WGL
+
+struct SDL_GLDriverData
+{
+    SDL_bool HAS_WGL_ARB_pixel_format;
+    SDL_bool HAS_WGL_EXT_swap_control_tear;
+    SDL_bool HAS_WGL_ARB_context_flush_control;
+    SDL_bool HAS_WGL_ARB_create_context_robustness;
+    SDL_bool HAS_WGL_ARB_create_context_no_error;
+
+    /* Max version of OpenGL ES context that can be created if the
+       implementation supports WGL_EXT_create_context_es2_profile.
+       major = minor = 0 when unsupported.
+     */
+    struct {
+        int major;
+        int minor;
+    } es_profile_max_supported_version;
+
+    void *(WINAPI * wglGetProcAddress) (const char *proc);
+    HGLRC(WINAPI * wglCreateContext) (HDC hdc);
+    BOOL(WINAPI * wglDeleteContext) (HGLRC hglrc);
+    BOOL(WINAPI * wglMakeCurrent) (HDC hdc, HGLRC hglrc);
+    BOOL(WINAPI * wglShareLists) (HGLRC hglrc1, HGLRC hglrc2);
+    BOOL(WINAPI * wglChoosePixelFormatARB) (HDC hdc,
+                                            const int *piAttribIList,
+                                            const FLOAT * pfAttribFList,
+                                            UINT nMaxFormats,
+                                            int *piFormats,
+                                            UINT * nNumFormats);
+    BOOL(WINAPI * wglGetPixelFormatAttribivARB) (HDC hdc, int iPixelFormat,
+                                                 int iLayerPlane,
+                                                 UINT nAttributes,
+                                                 const int *piAttributes,
+                                                 int *piValues);
+    BOOL (WINAPI * wglSwapIntervalEXT) (int interval);
+    int (WINAPI * wglGetSwapIntervalEXT) (void);
+};
+
+/* OpenGL functions */
+extern int WIN_GL_LoadLibrary(_THIS, const char *path);
+extern void *WIN_GL_GetProcAddress(_THIS, const char *proc);
+extern void WIN_GL_UnloadLibrary(_THIS);
+extern SDL_bool WIN_GL_UseEGL(_THIS);
+extern int WIN_GL_SetupWindow(_THIS, SDL_Window * window);
+extern SDL_GLContext WIN_GL_CreateContext(_THIS, SDL_Window * window);
+extern int WIN_GL_MakeCurrent(_THIS, SDL_Window * window,
+                              SDL_GLContext context);
+extern int WIN_GL_SetSwapInterval(_THIS, int interval);
+extern int WIN_GL_GetSwapInterval(_THIS);
+extern int WIN_GL_SwapWindow(_THIS, SDL_Window * window);
+extern void WIN_GL_DeleteContext(_THIS, SDL_GLContext context);
+extern void WIN_GL_InitExtensions(_THIS);
+extern SDL_bool WIN_GL_SetPixelFormatFrom(_THIS, SDL_Window * fromWindow, SDL_Window * toWindow);
+
+#ifndef WGL_ARB_pixel_format
+#define WGL_NUMBER_PIXEL_FORMATS_ARB   0x2000
+#define WGL_DRAW_TO_WINDOW_ARB         0x2001
+#define WGL_DRAW_TO_BITMAP_ARB         0x2002
+#define WGL_ACCELERATION_ARB           0x2003
+#define WGL_NEED_PALETTE_ARB           0x2004
+#define WGL_NEED_SYSTEM_PALETTE_ARB    0x2005
+#define WGL_SWAP_LAYER_BUFFERS_ARB     0x2006
+#define WGL_SWAP_METHOD_ARB            0x2007
+#define WGL_NUMBER_OVERLAYS_ARB        0x2008
+#define WGL_NUMBER_UNDERLAYS_ARB       0x2009
+#define WGL_TRANSPARENT_ARB            0x200A
+#define WGL_TRANSPARENT_RED_VALUE_ARB  0x2037
+#define WGL_TRANSPARENT_GREEN_VALUE_ARB 0x2038
+#define WGL_TRANSPARENT_BLUE_VALUE_ARB 0x2039
+#define WGL_TRANSPARENT_ALPHA_VALUE_ARB 0x203A
+#define WGL_TRANSPARENT_INDEX_VALUE_ARB 0x203B
+#define WGL_SHARE_DEPTH_ARB            0x200C
+#define WGL_SHARE_STENCIL_ARB          0x200D
+#define WGL_SHARE_ACCUM_ARB            0x200E
+#define WGL_SUPPORT_GDI_ARB            0x200F
+#define WGL_SUPPORT_OPENGL_ARB         0x2010
+#define WGL_DOUBLE_BUFFER_ARB          0x2011
+#define WGL_STEREO_ARB                 0x2012
+#define WGL_PIXEL_TYPE_ARB             0x2013
+#define WGL_COLOR_BITS_ARB             0x2014
+#define WGL_RED_BITS_ARB               0x2015
+#define WGL_RED_SHIFT_ARB              0x2016
+#define WGL_GREEN_BITS_ARB             0x2017
+#define WGL_GREEN_SHIFT_ARB            0x2018
+#define WGL_BLUE_BITS_ARB              0x2019
+#define WGL_BLUE_SHIFT_ARB             0x201A
+#define WGL_ALPHA_BITS_ARB             0x201B
+#define WGL_ALPHA_SHIFT_ARB            0x201C
+#define WGL_ACCUM_BITS_ARB             0x201D
+#define WGL_ACCUM_RED_BITS_ARB         0x201E
+#define WGL_ACCUM_GREEN_BITS_ARB       0x201F
+#define WGL_ACCUM_BLUE_BITS_ARB        0x2020
+#define WGL_ACCUM_ALPHA_BITS_ARB       0x2021
+#define WGL_DEPTH_BITS_ARB             0x2022
+#define WGL_STENCIL_BITS_ARB           0x2023
+#define WGL_AUX_BUFFERS_ARB            0x2024
+#define WGL_NO_ACCELERATION_ARB        0x2025
+#define WGL_GENERIC_ACCELERATION_ARB   0x2026
+#define WGL_FULL_ACCELERATION_ARB      0x2027
+#define WGL_SWAP_EXCHANGE_ARB          0x2028
+#define WGL_SWAP_COPY_ARB              0x2029
+#define WGL_SWAP_UNDEFINED_ARB         0x202A
+#define WGL_TYPE_RGBA_ARB              0x202B
+#define WGL_TYPE_COLORINDEX_ARB        0x202C
+#endif
+
+#ifndef WGL_ARB_multisample
+#define WGL_SAMPLE_BUFFERS_ARB         0x2041
+#define WGL_SAMPLES_ARB                0x2042
+#endif
+
+#endif /* SDL_VIDEO_OPENGL_WGL */
+
+#endif /* SDL_windowsopengl_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengles.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengles.c
new file mode 100644
index 0000000..0ff61c3
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengles.c
@@ -0,0 +1,131 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS && SDL_VIDEO_OPENGL_EGL
+
+#include "SDL_windowsvideo.h"
+#include "SDL_windowsopengles.h"
+#include "SDL_windowsopengl.h"
+#include "SDL_log.h"
+
+/* EGL implementation of SDL OpenGL support */
+
+int
+WIN_GLES_LoadLibrary(_THIS, const char *path) {
+
+    /* If the profile requested is not GL ES, switch over to WIN_GL functions  */
+    if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
+#if SDL_VIDEO_OPENGL_WGL
+        WIN_GLES_UnloadLibrary(_this);
+        _this->GL_LoadLibrary = WIN_GL_LoadLibrary;
+        _this->GL_GetProcAddress = WIN_GL_GetProcAddress;
+        _this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
+        _this->GL_CreateContext = WIN_GL_CreateContext;
+        _this->GL_MakeCurrent = WIN_GL_MakeCurrent;
+        _this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
+        _this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
+        _this->GL_SwapWindow = WIN_GL_SwapWindow;
+        _this->GL_DeleteContext = WIN_GL_DeleteContext;
+        return WIN_GL_LoadLibrary(_this, path);
+#else
+        return SDL_SetError("SDL not configured with OpenGL/WGL support");
+#endif
+    }
+    
+    if (_this->egl_data == NULL) {
+        return SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY, 0);
+    }
+
+    return 0;
+}
+
+SDL_GLContext
+WIN_GLES_CreateContext(_THIS, SDL_Window * window)
+{
+    SDL_GLContext context;
+    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
+
+#if SDL_VIDEO_OPENGL_WGL
+    if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
+        /* Switch to WGL based functions */
+        WIN_GLES_UnloadLibrary(_this);
+        _this->GL_LoadLibrary = WIN_GL_LoadLibrary;
+        _this->GL_GetProcAddress = WIN_GL_GetProcAddress;
+        _this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
+        _this->GL_CreateContext = WIN_GL_CreateContext;
+        _this->GL_MakeCurrent = WIN_GL_MakeCurrent;
+        _this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
+        _this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
+        _this->GL_SwapWindow = WIN_GL_SwapWindow;
+        _this->GL_DeleteContext = WIN_GL_DeleteContext;
+
+        if (WIN_GL_LoadLibrary(_this, NULL) != 0) {
+            return NULL;
+        }
+
+        return WIN_GL_CreateContext(_this, window);
+    }
+#endif
+
+    context = SDL_EGL_CreateContext(_this, data->egl_surface);
+    return context;
+}
+
+void
+WIN_GLES_DeleteContext(_THIS, SDL_GLContext context)
+{
+    SDL_EGL_DeleteContext(_this, context);
+    WIN_GLES_UnloadLibrary(_this);
+}
+
+SDL_EGL_SwapWindow_impl(WIN)
+SDL_EGL_MakeCurrent_impl(WIN)
+
+int
+WIN_GLES_SetupWindow(_THIS, SDL_Window * window)
+{
+    /* The current context is lost in here; save it and reset it. */
+    SDL_WindowData *windowdata = (SDL_WindowData *) window->driverdata;
+    SDL_Window *current_win = SDL_GL_GetCurrentWindow();
+    SDL_GLContext current_ctx = SDL_GL_GetCurrentContext();
+
+
+    if (_this->egl_data == NULL) {
+        if (SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY, 0) < 0) {
+            SDL_EGL_UnloadLibrary(_this);
+            return -1;
+        }
+    }
+  
+    /* Create the GLES window surface */
+    windowdata->egl_surface = SDL_EGL_CreateSurface(_this, (NativeWindowType)windowdata->hwnd);
+
+    if (windowdata->egl_surface == EGL_NO_SURFACE) {
+        return SDL_SetError("Could not create GLES window surface");
+    }
+
+    return WIN_GLES_MakeCurrent(_this, current_win, current_ctx);    
+}
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS && SDL_VIDEO_OPENGL_EGL */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengles.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengles.h
new file mode 100644
index 0000000..8684429
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsopengles.h
@@ -0,0 +1,49 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_winopengles_h_
+#define SDL_winopengles_h_
+
+#if SDL_VIDEO_OPENGL_EGL
+
+#include "../SDL_sysvideo.h"
+#include "../SDL_egl_c.h"
+
+/* OpenGLES functions */
+#define WIN_GLES_GetAttribute SDL_EGL_GetAttribute
+#define WIN_GLES_GetProcAddress SDL_EGL_GetProcAddress
+#define WIN_GLES_UnloadLibrary SDL_EGL_UnloadLibrary
+#define WIN_GLES_GetSwapInterval SDL_EGL_GetSwapInterval
+#define WIN_GLES_SetSwapInterval SDL_EGL_SetSwapInterval
+
+extern int WIN_GLES_LoadLibrary(_THIS, const char *path);
+extern SDL_GLContext WIN_GLES_CreateContext(_THIS, SDL_Window * window);
+extern int WIN_GLES_SwapWindow(_THIS, SDL_Window * window);
+extern int WIN_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context);
+extern void WIN_GLES_DeleteContext(_THIS, SDL_GLContext context);
+extern int WIN_GLES_SetupWindow(_THIS, SDL_Window * window);
+
+#endif /* SDL_VIDEO_OPENGL_EGL */
+
+#endif /* SDL_winopengles_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsshape.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowsshape.c
new file mode 100644
index 0000000..bed4588
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsshape.c
@@ -0,0 +1,110 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+#include "SDL_assert.h"
+#include "SDL_windowsshape.h"
+#include "SDL_windowsvideo.h"
+
+SDL_WindowShaper*
+Win32_CreateShaper(SDL_Window * window) {
+    int resized_properly;
+    SDL_WindowShaper* result = (SDL_WindowShaper *)SDL_malloc(sizeof(SDL_WindowShaper));
+    result->window = window;
+    result->mode.mode = ShapeModeDefault;
+    result->mode.parameters.binarizationCutoff = 1;
+    result->userx = result->usery = 0;
+    result->driverdata = (SDL_ShapeData*)SDL_malloc(sizeof(SDL_ShapeData));
+    ((SDL_ShapeData*)result->driverdata)->mask_tree = NULL;
+    /* Put some driver-data here. */
+    window->shaper = result;
+    resized_properly = Win32_ResizeWindowShape(window);
+    if (resized_properly != 0)
+            return NULL;
+
+    return result;
+}
+
+static void
+CombineRectRegions(SDL_ShapeTree* node,void* closure) {
+    HRGN mask_region = *((HRGN*)closure),temp_region = NULL;
+    if(node->kind == OpaqueShape) {
+        /* Win32 API regions exclude their outline, so we widen the region by one pixel in each direction to include the real outline. */
+        temp_region = CreateRectRgn(node->data.shape.x,node->data.shape.y,node->data.shape.x + node->data.shape.w + 1,node->data.shape.y + node->data.shape.h + 1);
+        if(mask_region != NULL) {
+            CombineRgn(mask_region,mask_region,temp_region,RGN_OR);
+            DeleteObject(temp_region);
+        }
+        else
+            *((HRGN*)closure) = temp_region;
+    }
+}
+
+int
+Win32_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
+    SDL_ShapeData *data;
+    HRGN mask_region = NULL;
+
+    if( (shaper == NULL) ||
+        (shape == NULL) ||
+        ((shape->format->Amask == 0) && (shape_mode->mode != ShapeModeColorKey)) ||
+        (shape->w != shaper->window->w) ||
+        (shape->h != shaper->window->h) ) {
+        return SDL_INVALID_SHAPE_ARGUMENT;
+    }
+
+    data = (SDL_ShapeData*)shaper->driverdata;
+    if(data->mask_tree != NULL)
+        SDL_FreeShapeTree(&data->mask_tree);
+    data->mask_tree = SDL_CalculateShapeTree(*shape_mode,shape);
+
+    SDL_TraverseShapeTree(data->mask_tree,&CombineRectRegions,&mask_region);
+    SDL_assert(mask_region != NULL);
+
+    SetWindowRgn(((SDL_WindowData *)(shaper->window->driverdata))->hwnd, mask_region, TRUE);
+
+    return 0;
+}
+
+int
+Win32_ResizeWindowShape(SDL_Window *window) {
+    SDL_ShapeData* data;
+
+    if (window == NULL)
+        return -1;
+    data = (SDL_ShapeData *)window->shaper->driverdata;
+    if (data == NULL)
+        return -1;
+
+    if(data->mask_tree != NULL)
+        SDL_FreeShapeTree(&data->mask_tree);
+    if(window->shaper->hasshape == SDL_TRUE) {
+        window->shaper->userx = window->x;
+        window->shaper->usery = window->y;
+        SDL_SetWindowPosition(window,-1000,-1000);
+    }
+
+    return 0;
+}
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsshape.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowsshape.h
new file mode 100644
index 0000000..eb1a887
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsshape.h
@@ -0,0 +1,40 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "../../SDL_internal.h"
+
+#ifndef SDL_windowsshape_h_
+#define SDL_windowsshape_h_
+
+#include "SDL_video.h"
+#include "SDL_shape.h"
+#include "../SDL_sysvideo.h"
+#include "../SDL_shape_internals.h"
+
+typedef struct {
+    SDL_ShapeTree *mask_tree;
+} SDL_ShapeData;
+
+extern SDL_WindowShaper* Win32_CreateShaper(SDL_Window * window);
+extern int Win32_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode);
+extern int Win32_ResizeWindowShape(SDL_Window *window);
+
+#endif /* SDL_windowsshape_h_ */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowstaskdialog.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowstaskdialog.h
new file mode 100644
index 0000000..a2a9e8a
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowstaskdialog.h
@@ -0,0 +1,156 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include <pshpack1.h>
+
+typedef HRESULT(CALLBACK *PFTASKDIALOGCALLBACK)(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam, LONG_PTR lpRefData);
+
+enum _TASKDIALOG_FLAGS
+{
+    TDF_ENABLE_HYPERLINKS = 0x0001,
+    TDF_USE_HICON_MAIN = 0x0002,
+    TDF_USE_HICON_FOOTER = 0x0004,
+    TDF_ALLOW_DIALOG_CANCELLATION = 0x0008,
+    TDF_USE_COMMAND_LINKS = 0x0010,
+    TDF_USE_COMMAND_LINKS_NO_ICON = 0x0020,
+    TDF_EXPAND_FOOTER_AREA = 0x0040,
+    TDF_EXPANDED_BY_DEFAULT = 0x0080,
+    TDF_VERIFICATION_FLAG_CHECKED = 0x0100,
+    TDF_SHOW_PROGRESS_BAR = 0x0200,
+    TDF_SHOW_MARQUEE_PROGRESS_BAR = 0x0400,
+    TDF_CALLBACK_TIMER = 0x0800,
+    TDF_POSITION_RELATIVE_TO_WINDOW = 0x1000,
+    TDF_RTL_LAYOUT = 0x2000,
+    TDF_NO_DEFAULT_RADIO_BUTTON = 0x4000,
+    TDF_CAN_BE_MINIMIZED = 0x8000,
+    //#if (NTDDI_VERSION >= NTDDI_WIN8)
+    TDF_NO_SET_FOREGROUND = 0x00010000, // Don't call SetForegroundWindow() when activating the dialog
+                                        //#endif // (NTDDI_VERSION >= NTDDI_WIN8)
+                                        TDF_SIZE_TO_CONTENT = 0x01000000  // used by ShellMessageBox to emulate MessageBox sizing behavior
+};
+typedef int TASKDIALOG_FLAGS;                         // Note: _TASKDIALOG_FLAGS is an int
+
+typedef enum _TASKDIALOG_MESSAGES
+{
+    TDM_NAVIGATE_PAGE = WM_USER + 101,
+    TDM_CLICK_BUTTON = WM_USER + 102, // wParam = Button ID
+    TDM_SET_MARQUEE_PROGRESS_BAR = WM_USER + 103, // wParam = 0 (nonMarque) wParam != 0 (Marquee)
+    TDM_SET_PROGRESS_BAR_STATE = WM_USER + 104, // wParam = new progress state
+    TDM_SET_PROGRESS_BAR_RANGE = WM_USER + 105, // lParam = MAKELPARAM(nMinRange, nMaxRange)
+    TDM_SET_PROGRESS_BAR_POS = WM_USER + 106, // wParam = new position
+    TDM_SET_PROGRESS_BAR_MARQUEE = WM_USER + 107, // wParam = 0 (stop marquee), wParam != 0 (start marquee), lparam = speed (milliseconds between repaints)
+    TDM_SET_ELEMENT_TEXT = WM_USER + 108, // wParam = element (TASKDIALOG_ELEMENTS), lParam = new element text (LPCWSTR)
+    TDM_CLICK_RADIO_BUTTON = WM_USER + 110, // wParam = Radio Button ID
+    TDM_ENABLE_BUTTON = WM_USER + 111, // lParam = 0 (disable), lParam != 0 (enable), wParam = Button ID
+    TDM_ENABLE_RADIO_BUTTON = WM_USER + 112, // lParam = 0 (disable), lParam != 0 (enable), wParam = Radio Button ID
+    TDM_CLICK_VERIFICATION = WM_USER + 113, // wParam = 0 (unchecked), 1 (checked), lParam = 1 (set key focus)
+    TDM_UPDATE_ELEMENT_TEXT = WM_USER + 114, // wParam = element (TASKDIALOG_ELEMENTS), lParam = new element text (LPCWSTR)
+    TDM_SET_BUTTON_ELEVATION_REQUIRED_STATE = WM_USER + 115, // wParam = Button ID, lParam = 0 (elevation not required), lParam != 0 (elevation required)
+    TDM_UPDATE_ICON = WM_USER + 116  // wParam = icon element (TASKDIALOG_ICON_ELEMENTS), lParam = new icon (hIcon if TDF_USE_HICON_* was set, PCWSTR otherwise)
+} TASKDIALOG_MESSAGES;
+
+typedef enum _TASKDIALOG_NOTIFICATIONS
+{
+    TDN_CREATED = 0,
+    TDN_NAVIGATED = 1,
+    TDN_BUTTON_CLICKED = 2,            // wParam = Button ID
+    TDN_HYPERLINK_CLICKED = 3,            // lParam = (LPCWSTR)pszHREF
+    TDN_TIMER = 4,            // wParam = Milliseconds since dialog created or timer reset
+    TDN_DESTROYED = 5,
+    TDN_RADIO_BUTTON_CLICKED = 6,            // wParam = Radio Button ID
+    TDN_DIALOG_CONSTRUCTED = 7,
+    TDN_VERIFICATION_CLICKED = 8,             // wParam = 1 if checkbox checked, 0 if not, lParam is unused and always 0
+    TDN_HELP = 9,
+    TDN_EXPANDO_BUTTON_CLICKED = 10            // wParam = 0 (dialog is now collapsed), wParam != 0 (dialog is now expanded)
+} TASKDIALOG_NOTIFICATIONS;
+
+typedef struct _TASKDIALOG_BUTTON
+{
+    int     nButtonID;
+    PCWSTR  pszButtonText;
+} TASKDIALOG_BUTTON;
+
+typedef enum _TASKDIALOG_ELEMENTS
+{
+    TDE_CONTENT,
+    TDE_EXPANDED_INFORMATION,
+    TDE_FOOTER,
+    TDE_MAIN_INSTRUCTION
+} TASKDIALOG_ELEMENTS;
+
+typedef enum _TASKDIALOG_ICON_ELEMENTS
+{
+    TDIE_ICON_MAIN,
+    TDIE_ICON_FOOTER
+} TASKDIALOG_ICON_ELEMENTS;
+
+#define TD_WARNING_ICON         MAKEINTRESOURCEW(-1)
+#define TD_ERROR_ICON           MAKEINTRESOURCEW(-2)
+#define TD_INFORMATION_ICON     MAKEINTRESOURCEW(-3)
+#define TD_SHIELD_ICON          MAKEINTRESOURCEW(-4)
+
+enum _TASKDIALOG_COMMON_BUTTON_FLAGS
+{
+    TDCBF_OK_BUTTON = 0x0001, // selected control return value IDOK
+    TDCBF_YES_BUTTON = 0x0002, // selected control return value IDYES
+    TDCBF_NO_BUTTON = 0x0004, // selected control return value IDNO
+    TDCBF_CANCEL_BUTTON = 0x0008, // selected control return value IDCANCEL
+    TDCBF_RETRY_BUTTON = 0x0010, // selected control return value IDRETRY
+    TDCBF_CLOSE_BUTTON = 0x0020  // selected control return value IDCLOSE
+};
+typedef int TASKDIALOG_COMMON_BUTTON_FLAGS;           // Note: _TASKDIALOG_COMMON_BUTTON_FLAGS is an int
+
+typedef struct _TASKDIALOGCONFIG
+{
+    UINT        cbSize;
+    HWND        hwndParent;                             // incorrectly named, this is the owner window, not a parent.
+    HINSTANCE   hInstance;                              // used for MAKEINTRESOURCE() strings
+    TASKDIALOG_FLAGS                dwFlags;            // TASKDIALOG_FLAGS (TDF_XXX) flags
+    TASKDIALOG_COMMON_BUTTON_FLAGS  dwCommonButtons;    // TASKDIALOG_COMMON_BUTTON (TDCBF_XXX) flags
+    PCWSTR      pszWindowTitle;                         // string or MAKEINTRESOURCE()
+    union
+    {
+        HICON   hMainIcon;
+        PCWSTR  pszMainIcon;
+    } /*DUMMYUNIONNAME*/;
+    PCWSTR      pszMainInstruction;
+    PCWSTR      pszContent;
+    UINT        cButtons;
+    const TASKDIALOG_BUTTON  *pButtons;
+    int         nDefaultButton;
+    UINT        cRadioButtons;
+    const TASKDIALOG_BUTTON  *pRadioButtons;
+    int         nDefaultRadioButton;
+    PCWSTR      pszVerificationText;
+    PCWSTR      pszExpandedInformation;
+    PCWSTR      pszExpandedControlText;
+    PCWSTR      pszCollapsedControlText;
+    union
+    {
+        HICON   hFooterIcon;
+        PCWSTR  pszFooterIcon;
+    } /*DUMMYUNIONNAME2*/;
+    PCWSTR      pszFooter;
+    PFTASKDIALOGCALLBACK pfCallback;
+    LONG_PTR    lpCallbackData;
+    UINT        cxWidth;                                // width of the Task Dialog's client area in DLU's. If 0, Task Dialog will calculate the ideal width.
+} TASKDIALOGCONFIG;
+
+#include <poppack.h>
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsvideo.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowsvideo.c
new file mode 100644
index 0000000..358ab23
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsvideo.c
@@ -0,0 +1,452 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+#include "SDL_main.h"
+#include "SDL_video.h"
+#include "SDL_hints.h"
+#include "SDL_mouse.h"
+#include "SDL_system.h"
+#include "../SDL_sysvideo.h"
+#include "../SDL_pixels_c.h"
+
+#include "SDL_windowsvideo.h"
+#include "SDL_windowsframebuffer.h"
+#include "SDL_windowsshape.h"
+#include "SDL_windowsvulkan.h"
+
+/* Initialization/Query functions */
+static int WIN_VideoInit(_THIS);
+static void WIN_VideoQuit(_THIS);
+
+/* Hints */
+SDL_bool g_WindowsEnableMessageLoop = SDL_TRUE;
+SDL_bool g_WindowFrameUsableWhileCursorHidden = SDL_TRUE;
+
+static void SDLCALL
+UpdateWindowsEnableMessageLoop(void *userdata, const char *name, const char *oldValue, const char *newValue)
+{
+    if (newValue && *newValue == '0') {
+        g_WindowsEnableMessageLoop = SDL_FALSE;
+    } else {
+        g_WindowsEnableMessageLoop = SDL_TRUE;
+    }
+}
+
+static void SDLCALL
+UpdateWindowFrameUsableWhileCursorHidden(void *userdata, const char *name, const char *oldValue, const char *newValue)
+{
+    if (newValue && *newValue == '0') {
+        g_WindowFrameUsableWhileCursorHidden = SDL_FALSE;
+    } else {
+        g_WindowFrameUsableWhileCursorHidden = SDL_TRUE;
+    }
+}
+
+static void WIN_SuspendScreenSaver(_THIS)
+{
+    if (_this->suspend_screensaver) {
+        SetThreadExecutionState(ES_CONTINUOUS | ES_DISPLAY_REQUIRED);
+    } else {
+        SetThreadExecutionState(ES_CONTINUOUS);
+    }
+}
+
+
+/* Windows driver bootstrap functions */
+
+static int
+WIN_Available(void)
+{
+    return (1);
+}
+
+static void
+WIN_DeleteDevice(SDL_VideoDevice * device)
+{
+    SDL_VideoData *data = (SDL_VideoData *) device->driverdata;
+
+    SDL_UnregisterApp();
+    if (data->userDLL) {
+        SDL_UnloadObject(data->userDLL);
+    }
+    if (data->shcoreDLL) {
+        SDL_UnloadObject(data->shcoreDLL);
+    }
+
+    SDL_free(device->driverdata);
+    SDL_free(device);
+}
+
+static SDL_VideoDevice *
+WIN_CreateDevice(int devindex)
+{
+    SDL_VideoDevice *device;
+    SDL_VideoData *data;
+
+    SDL_RegisterApp(NULL, 0, NULL);
+
+    /* Initialize all variables that we clean on shutdown */
+    device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
+    if (device) {
+        data = (struct SDL_VideoData *) SDL_calloc(1, sizeof(SDL_VideoData));
+    } else {
+        data = NULL;
+    }
+    if (!data) {
+        SDL_free(device);
+        SDL_OutOfMemory();
+        return NULL;
+    }
+    device->driverdata = data;
+
+    data->userDLL = SDL_LoadObject("USER32.DLL");
+    if (data->userDLL) {
+        data->CloseTouchInputHandle = (BOOL (WINAPI *)(HTOUCHINPUT)) SDL_LoadFunction(data->userDLL, "CloseTouchInputHandle");
+        data->GetTouchInputInfo = (BOOL (WINAPI *)(HTOUCHINPUT, UINT, PTOUCHINPUT, int)) SDL_LoadFunction(data->userDLL, "GetTouchInputInfo");
+        data->RegisterTouchWindow = (BOOL (WINAPI *)(HWND, ULONG)) SDL_LoadFunction(data->userDLL, "RegisterTouchWindow");
+    } else {
+        SDL_ClearError();
+    }
+
+    data->shcoreDLL = SDL_LoadObject("SHCORE.DLL");
+    if (data->shcoreDLL) {
+        data->GetDpiForMonitor = (HRESULT (WINAPI *)(HMONITOR, MONITOR_DPI_TYPE, UINT *, UINT *)) SDL_LoadFunction(data->shcoreDLL, "GetDpiForMonitor");
+    } else {
+        SDL_ClearError();
+    }
+
+    /* Set the function pointers */
+    device->VideoInit = WIN_VideoInit;
+    device->VideoQuit = WIN_VideoQuit;
+    device->GetDisplayBounds = WIN_GetDisplayBounds;
+    device->GetDisplayUsableBounds = WIN_GetDisplayUsableBounds;
+    device->GetDisplayDPI = WIN_GetDisplayDPI;
+    device->GetDisplayModes = WIN_GetDisplayModes;
+    device->SetDisplayMode = WIN_SetDisplayMode;
+    device->PumpEvents = WIN_PumpEvents;
+    device->SuspendScreenSaver = WIN_SuspendScreenSaver;
+
+    device->CreateSDLWindow = WIN_CreateWindow;
+    device->CreateSDLWindowFrom = WIN_CreateWindowFrom;
+    device->SetWindowTitle = WIN_SetWindowTitle;
+    device->SetWindowIcon = WIN_SetWindowIcon;
+    device->SetWindowPosition = WIN_SetWindowPosition;
+    device->SetWindowSize = WIN_SetWindowSize;
+    device->GetWindowBordersSize = WIN_GetWindowBordersSize;
+    device->SetWindowOpacity = WIN_SetWindowOpacity;
+    device->ShowWindow = WIN_ShowWindow;
+    device->HideWindow = WIN_HideWindow;
+    device->RaiseWindow = WIN_RaiseWindow;
+    device->MaximizeWindow = WIN_MaximizeWindow;
+    device->MinimizeWindow = WIN_MinimizeWindow;
+    device->RestoreWindow = WIN_RestoreWindow;
+    device->SetWindowBordered = WIN_SetWindowBordered;
+    device->SetWindowResizable = WIN_SetWindowResizable;
+    device->SetWindowFullscreen = WIN_SetWindowFullscreen;
+    device->SetWindowGammaRamp = WIN_SetWindowGammaRamp;
+    device->GetWindowGammaRamp = WIN_GetWindowGammaRamp;
+    device->SetWindowGrab = WIN_SetWindowGrab;
+    device->DestroyWindow = WIN_DestroyWindow;
+    device->GetWindowWMInfo = WIN_GetWindowWMInfo;
+    device->CreateWindowFramebuffer = WIN_CreateWindowFramebuffer;
+    device->UpdateWindowFramebuffer = WIN_UpdateWindowFramebuffer;
+    device->DestroyWindowFramebuffer = WIN_DestroyWindowFramebuffer;
+    device->OnWindowEnter = WIN_OnWindowEnter;
+    device->SetWindowHitTest = WIN_SetWindowHitTest;
+    device->AcceptDragAndDrop = WIN_AcceptDragAndDrop;
+
+    device->shape_driver.CreateShaper = Win32_CreateShaper;
+    device->shape_driver.SetWindowShape = Win32_SetWindowShape;
+    device->shape_driver.ResizeWindowShape = Win32_ResizeWindowShape;
+
+#if SDL_VIDEO_OPENGL_WGL
+    device->GL_LoadLibrary = WIN_GL_LoadLibrary;
+    device->GL_GetProcAddress = WIN_GL_GetProcAddress;
+    device->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
+    device->GL_CreateContext = WIN_GL_CreateContext;
+    device->GL_MakeCurrent = WIN_GL_MakeCurrent;
+    device->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
+    device->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
+    device->GL_SwapWindow = WIN_GL_SwapWindow;
+    device->GL_DeleteContext = WIN_GL_DeleteContext;
+#elif SDL_VIDEO_OPENGL_EGL        
+    /* Use EGL based functions */
+    device->GL_LoadLibrary = WIN_GLES_LoadLibrary;
+    device->GL_GetProcAddress = WIN_GLES_GetProcAddress;
+    device->GL_UnloadLibrary = WIN_GLES_UnloadLibrary;
+    device->GL_CreateContext = WIN_GLES_CreateContext;
+    device->GL_MakeCurrent = WIN_GLES_MakeCurrent;
+    device->GL_SetSwapInterval = WIN_GLES_SetSwapInterval;
+    device->GL_GetSwapInterval = WIN_GLES_GetSwapInterval;
+    device->GL_SwapWindow = WIN_GLES_SwapWindow;
+    device->GL_DeleteContext = WIN_GLES_DeleteContext;
+#endif
+#if SDL_VIDEO_VULKAN
+    device->Vulkan_LoadLibrary = WIN_Vulkan_LoadLibrary;
+    device->Vulkan_UnloadLibrary = WIN_Vulkan_UnloadLibrary;
+    device->Vulkan_GetInstanceExtensions = WIN_Vulkan_GetInstanceExtensions;
+    device->Vulkan_CreateSurface = WIN_Vulkan_CreateSurface;
+#endif
+
+    device->StartTextInput = WIN_StartTextInput;
+    device->StopTextInput = WIN_StopTextInput;
+    device->SetTextInputRect = WIN_SetTextInputRect;
+
+    device->SetClipboardText = WIN_SetClipboardText;
+    device->GetClipboardText = WIN_GetClipboardText;
+    device->HasClipboardText = WIN_HasClipboardText;
+
+    device->free = WIN_DeleteDevice;
+
+    return device;
+}
+
+
+VideoBootStrap WINDOWS_bootstrap = {
+    "windows", "SDL Windows video driver", WIN_Available, WIN_CreateDevice
+};
+
+int
+WIN_VideoInit(_THIS)
+{
+    if (WIN_InitModes(_this) < 0) {
+        return -1;
+    }
+
+    WIN_InitKeyboard(_this);
+    WIN_InitMouse(_this);
+
+    SDL_AddHintCallback(SDL_HINT_WINDOWS_ENABLE_MESSAGELOOP, UpdateWindowsEnableMessageLoop, NULL);
+    SDL_AddHintCallback(SDL_HINT_WINDOW_FRAME_USABLE_WHILE_CURSOR_HIDDEN, UpdateWindowFrameUsableWhileCursorHidden, NULL);
+
+    return 0;
+}
+
+void
+WIN_VideoQuit(_THIS)
+{
+    WIN_QuitModes(_this);
+    WIN_QuitKeyboard(_this);
+    WIN_QuitMouse(_this);
+}
+
+
+#define D3D_DEBUG_INFO
+#include <d3d9.h>
+
+SDL_bool 
+D3D_LoadDLL(void **pD3DDLL, IDirect3D9 **pDirect3D9Interface)
+{
+    *pD3DDLL = SDL_LoadObject("D3D9.DLL");
+    if (*pD3DDLL) {
+        typedef IDirect3D9 *(WINAPI *Direct3DCreate9_t) (UINT SDKVersion);
+        Direct3DCreate9_t Direct3DCreate9Func;
+
+#ifdef USE_D3D9EX
+        typedef HRESULT (WINAPI *Direct3DCreate9Ex_t)(UINT SDKVersion, IDirect3D9Ex **ppD3D);
+        Direct3DCreate9Ex_t Direct3DCreate9ExFunc;
+
+        Direct3DCreate9ExFunc = (Direct3DCreate9Ex_t)SDL_LoadFunction(*pD3DDLL, "Direct3DCreate9Ex");
+        if (Direct3DCreate9ExFunc) {
+            IDirect3D9Ex *pDirect3D9ExInterface;
+            HRESULT hr = Direct3DCreate9ExFunc(D3D_SDK_VERSION, &pDirect3D9ExInterface);
+            if (SUCCEEDED(hr)) {
+                const GUID IDirect3D9_GUID = { 0x81bdcbca, 0x64d4, 0x426d, { 0xae, 0x8d, 0xad, 0x1, 0x47, 0xf4, 0x27, 0x5c } };
+                hr = IDirect3D9Ex_QueryInterface(pDirect3D9ExInterface, &IDirect3D9_GUID, (void**)pDirect3D9Interface);
+                IDirect3D9Ex_Release(pDirect3D9ExInterface);
+                if (SUCCEEDED(hr)) {
+                    return SDL_TRUE;
+                }
+            }
+        }
+#endif /* USE_D3D9EX */
+
+        Direct3DCreate9Func = (Direct3DCreate9_t)SDL_LoadFunction(*pD3DDLL, "Direct3DCreate9");
+        if (Direct3DCreate9Func) {
+            *pDirect3D9Interface = Direct3DCreate9Func(D3D_SDK_VERSION);
+            if (*pDirect3D9Interface) {
+                return SDL_TRUE;
+            }
+        }
+
+        SDL_UnloadObject(*pD3DDLL);
+        *pD3DDLL = NULL;
+    }
+    *pDirect3D9Interface = NULL;
+    return SDL_FALSE;
+}
+
+
+int
+SDL_Direct3D9GetAdapterIndex(int displayIndex)
+{
+    void *pD3DDLL;
+    IDirect3D9 *pD3D;
+    if (!D3D_LoadDLL(&pD3DDLL, &pD3D)) {
+        SDL_SetError("Unable to create Direct3D interface");
+        return D3DADAPTER_DEFAULT;
+    } else {
+        SDL_DisplayData *pData = (SDL_DisplayData *)SDL_GetDisplayDriverData(displayIndex);
+        int adapterIndex = D3DADAPTER_DEFAULT;
+
+        if (!pData) {
+            SDL_SetError("Invalid display index");
+            adapterIndex = -1; /* make sure we return something invalid */
+        } else {
+            char *displayName = WIN_StringToUTF8(pData->DeviceName);
+            unsigned int count = IDirect3D9_GetAdapterCount(pD3D);
+            unsigned int i;
+            for (i=0; i<count; i++) {
+                D3DADAPTER_IDENTIFIER9 id;
+                IDirect3D9_GetAdapterIdentifier(pD3D, i, 0, &id);
+
+                if (SDL_strcmp(id.DeviceName, displayName) == 0) {
+                    adapterIndex = i;
+                    break;
+                }
+            }
+            SDL_free(displayName);
+        }
+
+        /* free up the D3D stuff we inited */
+        IDirect3D9_Release(pD3D);
+        SDL_UnloadObject(pD3DDLL);
+
+        return adapterIndex;
+    }
+}
+
+#if HAVE_DXGI_H
+#define CINTERFACE
+#define COBJMACROS
+#include <dxgi.h>
+
+static SDL_bool
+DXGI_LoadDLL(void **pDXGIDLL, IDXGIFactory **pDXGIFactory)
+{
+    *pDXGIDLL = SDL_LoadObject("DXGI.DLL");
+    if (*pDXGIDLL) {
+        HRESULT (WINAPI *CreateDXGI)(REFIID riid, void **ppFactory);
+
+        CreateDXGI =
+            (HRESULT (WINAPI *) (REFIID, void**)) SDL_LoadFunction(*pDXGIDLL,
+            "CreateDXGIFactory");
+        if (CreateDXGI) {
+            GUID dxgiGUID = {0x7b7166ec,0x21c7,0x44ae,{0xb2,0x1a,0xc9,0xae,0x32,0x1a,0xe3,0x69}};
+            if (!SUCCEEDED(CreateDXGI(&dxgiGUID, (void**)pDXGIFactory))) {
+                *pDXGIFactory = NULL;
+            }
+        }
+        if (!*pDXGIFactory) {
+            SDL_UnloadObject(*pDXGIDLL);
+            *pDXGIDLL = NULL;
+            return SDL_FALSE;
+        }
+
+        return SDL_TRUE;
+    } else {
+        *pDXGIFactory = NULL;
+        return SDL_FALSE;
+    }
+}
+#endif
+
+
+SDL_bool
+SDL_DXGIGetOutputInfo(int displayIndex, int *adapterIndex, int *outputIndex)
+{
+#if !HAVE_DXGI_H
+    if (adapterIndex) *adapterIndex = -1;
+    if (outputIndex) *outputIndex = -1;
+    SDL_SetError("SDL was compiled without DXGI support due to missing dxgi.h header");
+    return SDL_FALSE;
+#else
+    SDL_DisplayData *pData = (SDL_DisplayData *)SDL_GetDisplayDriverData(displayIndex);
+    void *pDXGIDLL;
+    char *displayName;
+    int nAdapter, nOutput;
+    IDXGIFactory *pDXGIFactory;
+    IDXGIAdapter *pDXGIAdapter;
+    IDXGIOutput* pDXGIOutput;
+
+    if (!adapterIndex) {
+        SDL_InvalidParamError("adapterIndex");
+        return SDL_FALSE;
+    }
+
+    if (!outputIndex) {
+        SDL_InvalidParamError("outputIndex");
+        return SDL_FALSE;
+    }
+
+    *adapterIndex = -1;
+    *outputIndex = -1;
+
+    if (!pData) {
+        SDL_SetError("Invalid display index");
+        return SDL_FALSE;
+    }
+
+    if (!DXGI_LoadDLL(&pDXGIDLL, &pDXGIFactory)) {
+        SDL_SetError("Unable to create DXGI interface");
+        return SDL_FALSE;
+    }
+
+    displayName = WIN_StringToUTF8(pData->DeviceName);
+    nAdapter = 0;
+    while (*adapterIndex == -1 && SUCCEEDED(IDXGIFactory_EnumAdapters(pDXGIFactory, nAdapter, &pDXGIAdapter))) {
+        nOutput = 0;
+        while (*adapterIndex == -1 && SUCCEEDED(IDXGIAdapter_EnumOutputs(pDXGIAdapter, nOutput, &pDXGIOutput))) {
+            DXGI_OUTPUT_DESC outputDesc;
+            if (SUCCEEDED(IDXGIOutput_GetDesc(pDXGIOutput, &outputDesc))) {
+                char *outputName = WIN_StringToUTF8(outputDesc.DeviceName);
+                if (SDL_strcmp(outputName, displayName) == 0) {
+                    *adapterIndex = nAdapter;
+                    *outputIndex = nOutput;
+                }
+                SDL_free(outputName);
+            }
+            IDXGIOutput_Release(pDXGIOutput);
+            nOutput++;
+        }
+        IDXGIAdapter_Release(pDXGIAdapter);
+        nAdapter++;
+    }
+    SDL_free(displayName);
+
+    /* free up the DXGI factory */
+    IDXGIFactory_Release(pDXGIFactory);
+    SDL_UnloadObject(pDXGIDLL);
+
+    if (*adapterIndex == -1) {
+        return SDL_FALSE;
+    } else {
+        return SDL_TRUE;
+    }
+#endif
+}
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
+
+/* vim: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsvideo.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowsvideo.h
new file mode 100644
index 0000000..1303754
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsvideo.h
@@ -0,0 +1,199 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_windowsvideo_h_
+#define SDL_windowsvideo_h_
+
+#include "../../core/windows/SDL_windows.h"
+
+#include "../SDL_sysvideo.h"
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1500)
+#include <msctf.h>
+#else
+#include "SDL_msctf.h"
+#endif
+
+#include <imm.h>
+
+#define MAX_CANDLIST    10
+#define MAX_CANDLENGTH  256
+
+#include "SDL_windowsclipboard.h"
+#include "SDL_windowsevents.h"
+#include "SDL_windowskeyboard.h"
+#include "SDL_windowsmodes.h"
+#include "SDL_windowsmouse.h"
+#include "SDL_windowsopengl.h"
+#include "SDL_windowsopengles.h"
+#include "SDL_windowswindow.h"
+#include "SDL_events.h"
+#include "SDL_loadso.h"
+
+
+#if WINVER < 0x0601
+/* Touch input definitions */
+#define TWF_FINETOUCH   1
+#define TWF_WANTPALM    2
+
+#define TOUCHEVENTF_MOVE 0x0001
+#define TOUCHEVENTF_DOWN 0x0002
+#define TOUCHEVENTF_UP   0x0004
+
+DECLARE_HANDLE(HTOUCHINPUT);
+
+typedef struct _TOUCHINPUT {
+    LONG      x;
+    LONG      y;
+    HANDLE    hSource;
+    DWORD     dwID;
+    DWORD     dwFlags;
+    DWORD     dwMask;
+    DWORD     dwTime;
+    ULONG_PTR dwExtraInfo;
+    DWORD     cxContact;
+    DWORD     cyContact;
+} TOUCHINPUT, *PTOUCHINPUT;
+
+#endif /* WINVER < 0x0601 */
+
+#if WINVER < 0x0603
+
+typedef enum MONITOR_DPI_TYPE {
+    MDT_EFFECTIVE_DPI = 0,
+    MDT_ANGULAR_DPI = 1,
+    MDT_RAW_DPI = 2,
+    MDT_DEFAULT = MDT_EFFECTIVE_DPI
+} MONITOR_DPI_TYPE;
+
+#endif /* WINVER < 0x0603 */
+
+typedef BOOL  (*PFNSHFullScreen)(HWND, DWORD);
+typedef void  (*PFCoordTransform)(SDL_Window*, POINT*);
+
+typedef struct
+{
+    void **lpVtbl;
+    int refcount;
+    void *data;
+} TSFSink;
+
+/* Definition from Win98DDK version of IMM.H */
+typedef struct tagINPUTCONTEXT2 {
+    HWND hWnd;
+    BOOL fOpen;
+    POINT ptStatusWndPos;
+    POINT ptSoftKbdPos;
+    DWORD fdwConversion;
+    DWORD fdwSentence;
+    union {
+        LOGFONTA A;
+        LOGFONTW W;
+    } lfFont;
+    COMPOSITIONFORM cfCompForm;
+    CANDIDATEFORM cfCandForm[4];
+    HIMCC hCompStr;
+    HIMCC hCandInfo;
+    HIMCC hGuideLine;
+    HIMCC hPrivate;
+    DWORD dwNumMsgBuf;
+    HIMCC hMsgBuf;
+    DWORD fdwInit;
+    DWORD dwReserve[3];
+} INPUTCONTEXT2, *PINPUTCONTEXT2, NEAR *NPINPUTCONTEXT2, FAR *LPINPUTCONTEXT2;
+
+/* Private display data */
+
+typedef struct SDL_VideoData
+{
+    int render;
+
+    DWORD clipboard_count;
+
+    /* Touch input functions */
+    void* userDLL;
+    BOOL (WINAPI *CloseTouchInputHandle)( HTOUCHINPUT );
+    BOOL (WINAPI *GetTouchInputInfo)( HTOUCHINPUT, UINT, PTOUCHINPUT, int );
+    BOOL (WINAPI *RegisterTouchWindow)( HWND, ULONG );
+
+    void* shcoreDLL;
+    HRESULT (WINAPI *GetDpiForMonitor)( HMONITOR         hmonitor,
+                                        MONITOR_DPI_TYPE dpiType,
+                                        UINT             *dpiX,
+                                        UINT             *dpiY );
+    
+    SDL_bool ime_com_initialized;
+    struct ITfThreadMgr *ime_threadmgr;
+    SDL_bool ime_initialized;
+    SDL_bool ime_enabled;
+    SDL_bool ime_available;
+    HWND ime_hwnd_main;
+    HWND ime_hwnd_current;
+    HIMC ime_himc;
+
+    WCHAR ime_composition[SDL_TEXTEDITINGEVENT_TEXT_SIZE];
+    WCHAR ime_readingstring[16];
+    int ime_cursor;
+
+    SDL_bool ime_candlist;
+    WCHAR ime_candidates[MAX_CANDLIST][MAX_CANDLENGTH];
+    DWORD ime_candcount;
+    DWORD ime_candref;
+    DWORD ime_candsel;
+    UINT ime_candpgsize;
+    int ime_candlistindexbase;
+    SDL_bool ime_candvertical;
+
+    SDL_bool ime_dirty;
+    SDL_Rect ime_rect;
+    SDL_Rect ime_candlistrect;
+    int ime_winwidth;
+    int ime_winheight;
+
+    HKL ime_hkl;
+    void* ime_himm32;
+    UINT (WINAPI *GetReadingString)(HIMC himc, UINT uReadingBufLen, LPWSTR lpwReadingBuf, PINT pnErrorIndex, BOOL *pfIsVertical, PUINT puMaxReadingLen);
+    BOOL (WINAPI *ShowReadingWindow)(HIMC himc, BOOL bShow);
+    LPINPUTCONTEXT2 (WINAPI *ImmLockIMC)(HIMC himc);
+    BOOL (WINAPI *ImmUnlockIMC)(HIMC himc);
+    LPVOID (WINAPI *ImmLockIMCC)(HIMCC himcc);
+    BOOL (WINAPI *ImmUnlockIMCC)(HIMCC himcc);
+
+    SDL_bool ime_uiless;
+    struct ITfThreadMgrEx *ime_threadmgrex;
+    DWORD ime_uielemsinkcookie;
+    DWORD ime_alpnsinkcookie;
+    DWORD ime_openmodesinkcookie;
+    DWORD ime_convmodesinkcookie;
+    TSFSink *ime_uielemsink;
+    TSFSink *ime_ippasink;
+} SDL_VideoData;
+
+extern SDL_bool g_WindowsEnableMessageLoop;
+extern SDL_bool g_WindowFrameUsableWhileCursorHidden;
+
+typedef struct IDirect3D9 IDirect3D9;
+extern SDL_bool D3D_LoadDLL( void **pD3DDLL, IDirect3D9 **pDirect3D9Interface );
+
+#endif /* SDL_windowsvideo_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsvulkan.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowsvulkan.c
new file mode 100644
index 0000000..6bb8f2a
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsvulkan.c
@@ -0,0 +1,176 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+/*
+ * @author Mark Callow, www.edgewise-consulting.com. Based on Jacob Lifshay's
+ * SDL_x11vulkan.c.
+ */
+
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_VULKAN && SDL_VIDEO_DRIVER_WINDOWS
+
+#include "SDL_windowsvideo.h"
+#include "SDL_windowswindow.h"
+#include "SDL_assert.h"
+
+#include "SDL_loadso.h"
+#include "SDL_windowsvulkan.h"
+#include "SDL_syswm.h"
+
+int WIN_Vulkan_LoadLibrary(_THIS, const char *path)
+{
+    VkExtensionProperties *extensions = NULL;
+    Uint32 extensionCount = 0;
+    Uint32 i;
+    SDL_bool hasSurfaceExtension = SDL_FALSE;
+    SDL_bool hasWin32SurfaceExtension = SDL_FALSE;
+    PFN_vkGetInstanceProcAddr vkGetInstanceProcAddr = NULL;
+    if(_this->vulkan_config.loader_handle)
+        return SDL_SetError("Vulkan already loaded");
+
+    /* Load the Vulkan loader library */
+    if(!path)
+        path = SDL_getenv("SDL_VULKAN_LIBRARY");
+    if(!path)
+        path = "vulkan-1.dll";
+    _this->vulkan_config.loader_handle = SDL_LoadObject(path);
+    if(!_this->vulkan_config.loader_handle)
+        return -1;
+    SDL_strlcpy(_this->vulkan_config.loader_path, path,
+                SDL_arraysize(_this->vulkan_config.loader_path));
+    vkGetInstanceProcAddr = (PFN_vkGetInstanceProcAddr)SDL_LoadFunction(
+        _this->vulkan_config.loader_handle, "vkGetInstanceProcAddr");
+    if(!vkGetInstanceProcAddr)
+        goto fail;
+    _this->vulkan_config.vkGetInstanceProcAddr = (void *)vkGetInstanceProcAddr;
+    _this->vulkan_config.vkEnumerateInstanceExtensionProperties =
+        (void *)((PFN_vkGetInstanceProcAddr)_this->vulkan_config.vkGetInstanceProcAddr)(
+            VK_NULL_HANDLE, "vkEnumerateInstanceExtensionProperties");
+    if(!_this->vulkan_config.vkEnumerateInstanceExtensionProperties)
+        goto fail;
+    extensions = SDL_Vulkan_CreateInstanceExtensionsList(
+        (PFN_vkEnumerateInstanceExtensionProperties)
+            _this->vulkan_config.vkEnumerateInstanceExtensionProperties,
+        &extensionCount);
+    if(!extensions)
+        goto fail;
+    for(i = 0; i < extensionCount; i++)
+    {
+        if(SDL_strcmp(VK_KHR_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)
+            hasSurfaceExtension = SDL_TRUE;
+        else if(SDL_strcmp(VK_KHR_WIN32_SURFACE_EXTENSION_NAME, extensions[i].extensionName) == 0)
+            hasWin32SurfaceExtension = SDL_TRUE;
+    }
+    SDL_free(extensions);
+    if(!hasSurfaceExtension)
+    {
+        SDL_SetError("Installed Vulkan doesn't implement the "
+                     VK_KHR_SURFACE_EXTENSION_NAME " extension");
+        goto fail;
+    }
+    else if(!hasWin32SurfaceExtension)
+    {
+        SDL_SetError("Installed Vulkan doesn't implement the "
+                     VK_KHR_WIN32_SURFACE_EXTENSION_NAME "extension");
+        goto fail;
+    }
+    return 0;
+
+fail:
+    SDL_UnloadObject(_this->vulkan_config.loader_handle);
+    _this->vulkan_config.loader_handle = NULL;
+    return -1;
+}
+
+void WIN_Vulkan_UnloadLibrary(_THIS)
+{
+    if(_this->vulkan_config.loader_handle)
+    {
+        SDL_UnloadObject(_this->vulkan_config.loader_handle);
+        _this->vulkan_config.loader_handle = NULL;
+    }
+}
+
+SDL_bool WIN_Vulkan_GetInstanceExtensions(_THIS,
+                                          SDL_Window *window,
+                                          unsigned *count,
+                                          const char **names)
+{
+    static const char *const extensionsForWin32[] = {
+        VK_KHR_SURFACE_EXTENSION_NAME, VK_KHR_WIN32_SURFACE_EXTENSION_NAME
+    };
+    if(!_this->vulkan_config.loader_handle)
+    {
+        SDL_SetError("Vulkan is not loaded");
+        return SDL_FALSE;
+    }
+    return SDL_Vulkan_GetInstanceExtensions_Helper(
+            count, names, SDL_arraysize(extensionsForWin32),
+            extensionsForWin32);
+}
+
+SDL_bool WIN_Vulkan_CreateSurface(_THIS,
+                                  SDL_Window *window,
+                                  VkInstance instance,
+                                  VkSurfaceKHR *surface)
+{
+    SDL_WindowData *windowData = (SDL_WindowData *)window->driverdata;
+    PFN_vkGetInstanceProcAddr vkGetInstanceProcAddr =
+        (PFN_vkGetInstanceProcAddr)_this->vulkan_config.vkGetInstanceProcAddr;
+    PFN_vkCreateWin32SurfaceKHR vkCreateWin32SurfaceKHR =
+        (PFN_vkCreateWin32SurfaceKHR)vkGetInstanceProcAddr(
+                                            (VkInstance)instance,
+                                            "vkCreateWin32SurfaceKHR");
+    VkWin32SurfaceCreateInfoKHR createInfo;
+    VkResult result;
+
+    if(!_this->vulkan_config.loader_handle)
+    {
+        SDL_SetError("Vulkan is not loaded");
+        return SDL_FALSE;
+    }
+
+    if(!vkCreateWin32SurfaceKHR)
+    {
+        SDL_SetError(VK_KHR_WIN32_SURFACE_EXTENSION_NAME
+                     " extension is not enabled in the Vulkan instance.");
+        return SDL_FALSE;
+    }
+    createInfo.sType = VK_STRUCTURE_TYPE_WIN32_SURFACE_CREATE_INFO_KHR;
+    createInfo.pNext = NULL;
+    createInfo.flags = 0;
+    createInfo.hinstance = windowData->hinstance;
+    createInfo.hwnd = windowData->hwnd;
+    result = vkCreateWin32SurfaceKHR(instance, &createInfo,
+                                       NULL, surface);
+    if(result != VK_SUCCESS)
+    {
+        SDL_SetError("vkCreateWin32SurfaceKHR failed: %s",
+                     SDL_Vulkan_GetResultString(result));
+        return SDL_FALSE;
+    }
+    return SDL_TRUE;
+}
+
+#endif
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowsvulkan.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowsvulkan.h
new file mode 100644
index 0000000..0acc0a9
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowsvulkan.h
@@ -0,0 +1,52 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+/*
+ * @author Mark Callow, www.edgewise-consulting.com. Based on Jacob Lifshay's
+ * SDL_x11vulkan.h.
+ */
+
+#include "../../SDL_internal.h"
+
+#ifndef SDL_windowsvulkan_h_
+#define SDL_windowsvulkan_h_
+
+#include "../SDL_vulkan_internal.h"
+#include "../SDL_sysvideo.h"
+
+#if SDL_VIDEO_VULKAN && SDL_VIDEO_DRIVER_WINDOWS
+
+int WIN_Vulkan_LoadLibrary(_THIS, const char *path);
+void WIN_Vulkan_UnloadLibrary(_THIS);
+SDL_bool WIN_Vulkan_GetInstanceExtensions(_THIS,
+                                          SDL_Window *window,
+                                          unsigned *count,
+                                          const char **names);
+SDL_bool WIN_Vulkan_CreateSurface(_THIS,
+                                  SDL_Window *window,
+                                  VkInstance instance,
+                                  VkSurfaceKHR *surface);
+
+#endif
+
+#endif /* SDL_windowsvulkan_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowswindow.c b/source/3rd-party/SDL2/src/video/windows/SDL_windowswindow.c
new file mode 100644
index 0000000..45463c4
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowswindow.c
@@ -0,0 +1,996 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if SDL_VIDEO_DRIVER_WINDOWS
+
+#include "../../core/windows/SDL_windows.h"
+
+#include "SDL_assert.h"
+#include "../SDL_sysvideo.h"
+#include "../SDL_pixels_c.h"
+#include "../../events/SDL_keyboard_c.h"
+#include "../../events/SDL_mouse_c.h"
+
+#include "SDL_windowsvideo.h"
+#include "SDL_windowswindow.h"
+#include "SDL_hints.h"
+
+/* Dropfile support */
+#include <shellapi.h>
+
+/* This is included after SDL_windowsvideo.h, which includes windows.h */
+#include "SDL_syswm.h"
+
+/* Windows CE compatibility */
+#ifndef SWP_NOCOPYBITS
+#define SWP_NOCOPYBITS 0
+#endif
+
+/* Fake window to help with DirectInput events. */
+HWND SDL_HelperWindow = NULL;
+static WCHAR *SDL_HelperWindowClassName = TEXT("SDLHelperWindowInputCatcher");
+static WCHAR *SDL_HelperWindowName = TEXT("SDLHelperWindowInputMsgWindow");
+static ATOM SDL_HelperWindowClass = 0;
+
+/* For borderless Windows, still want the following flags:
+   - WS_CAPTION: this seems to enable the Windows minimize animation
+   - WS_SYSMENU: enables system context menu on task bar
+   - WS_MINIMIZEBOX: window will respond to Windows minimize commands sent to all windows, such as windows key + m, shaking title bar, etc.
+   This will also cause the task bar to overlap the window and other windowed behaviors, so only use this for windows that shouldn't appear to be fullscreen
+ */
+
+#define STYLE_BASIC         (WS_CLIPSIBLINGS | WS_CLIPCHILDREN)
+#define STYLE_FULLSCREEN    (WS_POPUP)
+#define STYLE_BORDERLESS    (WS_POPUP)
+#define STYLE_BORDERLESS_WINDOWED (WS_POPUP | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX)
+#define STYLE_NORMAL        (WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX)
+#define STYLE_RESIZABLE     (WS_THICKFRAME | WS_MAXIMIZEBOX)
+#define STYLE_MASK          (STYLE_FULLSCREEN | STYLE_BORDERLESS | STYLE_NORMAL | STYLE_RESIZABLE)
+
+static DWORD
+GetWindowStyle(SDL_Window * window)
+{
+    DWORD style = 0;
+
+    if (window->flags & SDL_WINDOW_FULLSCREEN) {
+        style |= STYLE_FULLSCREEN;
+    } else {
+        if (window->flags & SDL_WINDOW_BORDERLESS) {
+            /* SDL 2.1:
+               This behavior more closely matches other platform where the window is borderless
+               but still interacts with the window manager (e.g. task bar shows above it, it can
+               be resized to fit within usable desktop area, etc.) so this should be the behavior
+               for a future SDL release.
+
+               If you want a borderless window the size of the desktop that looks like a fullscreen
+               window, then you should use the SDL_WINDOW_FULLSCREEN_DESKTOP flag.
+             */
+            if (SDL_GetHintBoolean("SDL_BORDERLESS_WINDOWED_STYLE", SDL_FALSE)) {
+                style |= STYLE_BORDERLESS_WINDOWED;
+            } else {
+                style |= STYLE_BORDERLESS;
+            }
+        } else {
+            style |= STYLE_NORMAL;
+        }
+
+        /* You can have a borderless resizable window */
+        if (window->flags & SDL_WINDOW_RESIZABLE) {
+            style |= STYLE_RESIZABLE;
+        }
+
+        /* Need to set initialize minimize style, or when we call ShowWindow with WS_MINIMIZE it will activate a random window */
+        if (window->flags & SDL_WINDOW_MINIMIZED) {
+            style |= WS_MINIMIZE;
+        }
+    }
+    return style;
+}
+
+static void
+WIN_AdjustWindowRectWithStyle(SDL_Window *window, DWORD style, BOOL menu, int *x, int *y, int *width, int *height, SDL_bool use_current)
+{
+    RECT rect;
+
+    rect.left = 0;
+    rect.top = 0;
+    rect.right = (use_current ? window->w : window->windowed.w);
+    rect.bottom = (use_current ? window->h : window->windowed.h);
+
+    /* borderless windows will have WM_NCCALCSIZE return 0 for the non-client area. When this happens, it looks like windows will send a resize message
+       expanding the window client area to the previous window + chrome size, so shouldn't need to adjust the window size for the set styles.
+     */
+    if (!(window->flags & SDL_WINDOW_BORDERLESS))
+        AdjustWindowRectEx(&rect, style, menu, 0);
+
+    *x = (use_current ? window->x : window->windowed.x) + rect.left;
+    *y = (use_current ? window->y : window->windowed.y) + rect.top;
+    *width = (rect.right - rect.left);
+    *height = (rect.bottom - rect.top);
+}
+
+static void
+WIN_AdjustWindowRect(SDL_Window *window, int *x, int *y, int *width, int *height, SDL_bool use_current)
+{
+    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
+    HWND hwnd = data->hwnd;
+    DWORD style;
+    BOOL menu;
+
+    style = GetWindowLong(hwnd, GWL_STYLE);
+    menu = (style & WS_CHILDWINDOW) ? FALSE : (GetMenu(hwnd) != NULL);
+    WIN_AdjustWindowRectWithStyle(window, style, menu, x, y, width, height, use_current);
+}
+
+static void
+WIN_SetWindowPositionInternal(_THIS, SDL_Window * window, UINT flags)
+{
+    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
+    HWND hwnd = data->hwnd;
+    HWND top;
+    int x, y;
+    int w, h;
+
+    /* Figure out what the window area will be */
+    if (SDL_ShouldAllowTopmost() && ((window->flags & (SDL_WINDOW_FULLSCREEN|SDL_WINDOW_INPUT_FOCUS)) == (SDL_WINDOW_FULLSCREEN|SDL_WINDOW_INPUT_FOCUS) || (window->flags & SDL_WINDOW_ALWAYS_ON_TOP))) {
+        top = HWND_TOPMOST;
+    } else {
+        top = HWND_NOTOPMOST;
+    }
+
+    WIN_AdjustWindowRect(window, &x, &y, &w, &h, SDL_TRUE);    
+
+    data->expected_resize = SDL_TRUE;
+    SetWindowPos(hwnd, top, x, y, w, h, flags);
+    data->expected_resize = SDL_FALSE;
+}
+
+static int
+SetupWindowData(_THIS, SDL_Window * window, HWND hwnd, HWND parent, SDL_bool created)
+{
+    SDL_VideoData *videodata = (SDL_VideoData *) _this->driverdata;
+    SDL_WindowData *data;
+
+    /* Allocate the window data */
+    data = (SDL_WindowData *) SDL_calloc(1, sizeof(*data));
+    if (!data) {
+        return SDL_OutOfMemory();
+    }
+    data->window = window;
+    data->hwnd = hwnd;
+    data->parent = parent;
+    data->hdc = GetDC(hwnd);
+    data->hinstance = (HINSTANCE) GetWindowLongPtr(hwnd, GWLP_HINSTANCE);
+    data->created = created;
+    data->mouse_button_flags = 0;
+    data->videodata = videodata;
+    data->initializing = SDL_TRUE;
+
+    window->driverdata = data;
+
+    /* Associate the data with the window */
+    if (!SetProp(hwnd, TEXT("SDL_WindowData"), data)) {
+        ReleaseDC(hwnd, data->hdc);
+        SDL_free(data);
+        return WIN_SetError("SetProp() failed");
+    }
+
+    /* Set up the window proc function */
+#ifdef GWLP_WNDPROC
+    data->wndproc = (WNDPROC) GetWindowLongPtr(hwnd, GWLP_WNDPROC);
+    if (data->wndproc == WIN_WindowProc) {
+        data->wndproc = NULL;
+    } else {
+        SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR) WIN_WindowProc);
+    }
+#else
+    data->wndproc = (WNDPROC) GetWindowLong(hwnd, GWL_WNDPROC);
+    if (data->wndproc == WIN_WindowProc) {
+        data->wndproc = NULL;
+    } else {
+        SetWindowLong(hwnd, GWL_WNDPROC, (LONG_PTR) WIN_WindowProc);
+    }
+#endif
+
+    /* Fill in the SDL window with the window data */
+    {
+        RECT rect;
+        if (GetClientRect(hwnd, &rect)) {
+            int w = rect.right;
+            int h = rect.bottom;
+            if ((window->windowed.w && window->windowed.w != w) || (window->windowed.h && window->windowed.h != h)) {
+                /* We tried to create a window larger than the desktop and Windows didn't allow it.  Override! */
+                int x, y;
+                /* Figure out what the window area will be */
+                WIN_AdjustWindowRect(window, &x, &y, &w, &h, SDL_FALSE);
+                SetWindowPos(hwnd, HWND_NOTOPMOST, x, y, w, h, SWP_NOCOPYBITS | SWP_NOZORDER | SWP_NOACTIVATE);
+            } else {
+                window->w = w;
+                window->h = h;
+            }
+        }
+    }
+    {
+        POINT point;
+        point.x = 0;
+        point.y = 0;
+        if (ClientToScreen(hwnd, &point)) {
+            window->x = point.x;
+            window->y = point.y;
+        }
+    }
+    {
+        DWORD style = GetWindowLong(hwnd, GWL_STYLE);
+        if (style & WS_VISIBLE) {
+            window->flags |= SDL_WINDOW_SHOWN;
+        } else {
+            window->flags &= ~SDL_WINDOW_SHOWN;
+        }
+        if (style & WS_POPUP) {
+            window->flags |= SDL_WINDOW_BORDERLESS;
+        } else {
+            window->flags &= ~SDL_WINDOW_BORDERLESS;
+        }
+        if (style & WS_THICKFRAME) {
+            window->flags |= SDL_WINDOW_RESIZABLE;
+        } else {
+            window->flags &= ~SDL_WINDOW_RESIZABLE;
+        }
+#ifdef WS_MAXIMIZE
+        if (style & WS_MAXIMIZE) {
+            window->flags |= SDL_WINDOW_MAXIMIZED;
+        } else
+#endif
+        {
+            window->flags &= ~SDL_WINDOW_MAXIMIZED;
+        }
+#ifdef WS_MINIMIZE
+        if (style & WS_MINIMIZE) {
+            window->flags |= SDL_WINDOW_MINIMIZED;
+        } else
+#endif
+        {
+            window->flags &= ~SDL_WINDOW_MINIMIZED;
+        }
+    }
+    if (GetFocus() == hwnd) {
+        window->flags |= SDL_WINDOW_INPUT_FOCUS;
+        SDL_SetKeyboardFocus(data->window);
+
+        if (window->flags & SDL_WINDOW_INPUT_GRABBED) {
+            RECT rect;
+            GetClientRect(hwnd, &rect);
+            ClientToScreen(hwnd, (LPPOINT) & rect);
+            ClientToScreen(hwnd, (LPPOINT) & rect + 1);
+            ClipCursor(&rect);
+        }
+    }
+
+    /* Enable multi-touch */
+    if (videodata->RegisterTouchWindow) {
+        videodata->RegisterTouchWindow(hwnd, (TWF_FINETOUCH|TWF_WANTPALM));
+    }
+
+    data->initializing = SDL_FALSE;
+
+    /* All done! */
+    return 0;
+}
+
+
+
+int
+WIN_CreateWindow(_THIS, SDL_Window * window)
+{
+    HWND hwnd, parent = NULL;
+    DWORD style = STYLE_BASIC;
+    int x, y;
+    int w, h;
+
+    if (window->flags & SDL_WINDOW_SKIP_TASKBAR) {
+        parent = CreateWindow(SDL_Appname, TEXT(""), STYLE_BASIC, 0, 0, 32, 32, NULL, NULL, SDL_Instance, NULL);
+    }
+
+    style |= GetWindowStyle(window);
+
+    /* Figure out what the window area will be */
+    WIN_AdjustWindowRectWithStyle(window, style, FALSE, &x, &y, &w, &h, SDL_FALSE);
+
+    hwnd =
+        CreateWindow(SDL_Appname, TEXT(""), style, x, y, w, h, parent, NULL,
+                     SDL_Instance, NULL);
+    if (!hwnd) {
+        return WIN_SetError("Couldn't create window");
+    }
+
+    WIN_PumpEvents(_this);
+
+    if (SetupWindowData(_this, window, hwnd, parent, SDL_TRUE) < 0) {
+        DestroyWindow(hwnd);
+        if (parent) {
+            DestroyWindow(parent);
+        }
+        return -1;
+    }
+
+    /* Inform Windows of the frame change so we can respond to WM_NCCALCSIZE */
+    SetWindowPos(hwnd, NULL, 0, 0, 0, 0, SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOZORDER | SWP_NOMOVE | SWP_NOACTIVATE);
+
+    if (window->flags & SDL_WINDOW_MINIMIZED) {
+        ShowWindow(hwnd, SW_SHOWMINNOACTIVE);
+    }
+
+    if (!(window->flags & SDL_WINDOW_OPENGL)) {
+        return 0;
+    }
+
+    /* The rest of this macro mess is for OpenGL or OpenGL ES windows */
+#if SDL_VIDEO_OPENGL_ES2
+    if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES
+#if SDL_VIDEO_OPENGL_WGL
+        && (!_this->gl_data || WIN_GL_UseEGL(_this))
+#endif /* SDL_VIDEO_OPENGL_WGL */
+    ) {
+#if SDL_VIDEO_OPENGL_EGL
+        if (WIN_GLES_SetupWindow(_this, window) < 0) {
+            WIN_DestroyWindow(_this, window);
+            return -1;
+        }
+        return 0;
+#else
+        return SDL_SetError("Could not create GLES window surface (EGL support not configured)");
+#endif /* SDL_VIDEO_OPENGL_EGL */ 
+    }
+#endif /* SDL_VIDEO_OPENGL_ES2 */
+
+#if SDL_VIDEO_OPENGL_WGL
+    if (WIN_GL_SetupWindow(_this, window) < 0) {
+        WIN_DestroyWindow(_this, window);
+        return -1;
+    }
+#else
+    return SDL_SetError("Could not create GL window (WGL support not configured)");
+#endif
+
+    return 0;
+}
+
+int
+WIN_CreateWindowFrom(_THIS, SDL_Window * window, const void *data)
+{
+    HWND hwnd = (HWND) data;
+    LPTSTR title;
+    int titleLen;
+
+    /* Query the title from the existing window */
+    titleLen = GetWindowTextLength(hwnd);
+    title = SDL_stack_alloc(TCHAR, titleLen + 1);
+    if (title) {
+        titleLen = GetWindowText(hwnd, title, titleLen);
+    } else {
+        titleLen = 0;
+    }
+    if (titleLen > 0) {
+        window->title = WIN_StringToUTF8(title);
+    }
+    if (title) {
+        SDL_stack_free(title);
+    }
+
+    if (SetupWindowData(_this, window, hwnd, GetParent(hwnd), SDL_FALSE) < 0) {
+        return -1;
+    }
+
+#if SDL_VIDEO_OPENGL_WGL
+    {
+        const char *hint = SDL_GetHint(SDL_HINT_VIDEO_WINDOW_SHARE_PIXEL_FORMAT);
+        if (hint) {
+            /* This hint is a pointer (in string form) of the address of
+               the window to share a pixel format with
+            */
+            SDL_Window *otherWindow = NULL;
+            SDL_sscanf(hint, "%p", (void**)&otherWindow);
+
+            /* Do some error checking on the pointer */
+            if (otherWindow != NULL && otherWindow->magic == &_this->window_magic) {
+                /* If the otherWindow has SDL_WINDOW_OPENGL set, set it for the new window as well */
+                if (otherWindow->flags & SDL_WINDOW_OPENGL) {
+                    window->flags |= SDL_WINDOW_OPENGL;
+                    if (!WIN_GL_SetPixelFormatFrom(_this, otherWindow, window)) {
+                        return -1;
+                    }
+                }
+            }
+        }
+    }
+#endif
+    return 0;
+}
+
+void
+WIN_SetWindowTitle(_THIS, SDL_Window * window)
+{
+    HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
+    LPTSTR title = WIN_UTF8ToString(window->title);
+    SetWindowText(hwnd, title);
+    SDL_free(title);
+}
+
+void
+WIN_SetWindowIcon(_THIS, SDL_Window * window, SDL_Surface * icon)
+{
+    HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
+    HICON hicon = NULL;
+    BYTE *icon_bmp;
+    int icon_len, mask_len, y;
+    SDL_RWops *dst;
+
+    /* Create temporary buffer for ICONIMAGE structure */
+    mask_len = (icon->h * (icon->w + 7)/8);
+    icon_len = 40 + icon->h * icon->w * sizeof(Uint32) + mask_len;
+    icon_bmp = SDL_stack_alloc(BYTE, icon_len);
+    dst = SDL_RWFromMem(icon_bmp, icon_len);
+    if (!dst) {
+        SDL_stack_free(icon_bmp);
+        return;
+    }
+
+    /* Write the BITMAPINFO header */
+    SDL_WriteLE32(dst, 40);
+    SDL_WriteLE32(dst, icon->w);
+    SDL_WriteLE32(dst, icon->h * 2);
+    SDL_WriteLE16(dst, 1);
+    SDL_WriteLE16(dst, 32);
+    SDL_WriteLE32(dst, BI_RGB);
+    SDL_WriteLE32(dst, icon->h * icon->w * sizeof(Uint32));
+    SDL_WriteLE32(dst, 0);
+    SDL_WriteLE32(dst, 0);
+    SDL_WriteLE32(dst, 0);
+    SDL_WriteLE32(dst, 0);
+
+    /* Write the pixels upside down into the bitmap buffer */
+    SDL_assert(icon->format->format == SDL_PIXELFORMAT_ARGB8888);
+    y = icon->h;
+    while (y--) {
+        Uint8 *src = (Uint8 *) icon->pixels + y * icon->pitch;
+        SDL_RWwrite(dst, src, icon->w * sizeof(Uint32), 1);
+    }
+
+    /* Write the mask */
+    SDL_memset(icon_bmp + icon_len - mask_len, 0xFF, mask_len);
+
+    hicon = CreateIconFromResource(icon_bmp, icon_len, TRUE, 0x00030000);
+
+    SDL_RWclose(dst);
+    SDL_stack_free(icon_bmp);
+
+    /* Set the icon for the window */
+    SendMessage(hwnd, WM_SETICON, ICON_SMALL, (LPARAM) hicon);
+
+    /* Set the icon in the task manager (should we do this?) */
+    SendMessage(hwnd, WM_SETICON, ICON_BIG, (LPARAM) hicon);
+}
+
+void
+WIN_SetWindowPosition(_THIS, SDL_Window * window)
+{
+    WIN_SetWindowPositionInternal(_this, window, SWP_NOCOPYBITS | SWP_NOSIZE | SWP_NOACTIVATE);
+}
+
+void
+WIN_SetWindowSize(_THIS, SDL_Window * window)
+{
+    WIN_SetWindowPositionInternal(_this, window, SWP_NOCOPYBITS | SWP_NOMOVE | SWP_NOACTIVATE);
+}
+
+int
+WIN_GetWindowBordersSize(_THIS, SDL_Window * window, int *top, int *left, int *bottom, int *right)
+{
+    HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
+    RECT rcClient, rcWindow;
+    POINT ptDiff;
+
+    /* rcClient stores the size of the inner window, while rcWindow stores the outer size relative to the top-left
+     * screen position; so the top/left values of rcClient are always {0,0} and bottom/right are {height,width} */
+    GetClientRect(hwnd, &rcClient);
+    GetWindowRect(hwnd, &rcWindow);
+
+    /* convert the top/left values to make them relative to
+     * the window; they will end up being slightly negative */
+    ptDiff.y = rcWindow.top;
+    ptDiff.x = rcWindow.left;
+
+    ScreenToClient(hwnd, &ptDiff);
+
+    rcWindow.top  = ptDiff.y;
+    rcWindow.left = ptDiff.x;
+
+    /* convert the bottom/right values to make them relative to the window,
+     * these will be slightly bigger than the inner width/height */
+    ptDiff.y = rcWindow.bottom;
+    ptDiff.x = rcWindow.right;
+
+    ScreenToClient(hwnd, &ptDiff);
+
+    rcWindow.bottom = ptDiff.y;
+    rcWindow.right  = ptDiff.x;
+
+    /* Now that both the inner and outer rects use the same coordinate system we can substract them to get the border size.
+     * Keep in mind that the top/left coordinates of rcWindow are negative because the border lies slightly before {0,0},
+     * so switch them around because SDL2 wants them in positive. */
+    *top    = rcClient.top    - rcWindow.top;
+    *left   = rcClient.left   - rcWindow.left;
+    *bottom = rcWindow.bottom - rcClient.bottom;
+    *right  = rcWindow.right  - rcClient.right;
+
+    return 0;
+}
+
+void
+WIN_ShowWindow(_THIS, SDL_Window * window)
+{
+    DWORD style;
+    HWND hwnd;
+    int nCmdShow;
+    
+    hwnd = ((SDL_WindowData *)window->driverdata)->hwnd;
+    nCmdShow = SW_SHOW;
+    style = GetWindowLong(hwnd, GWL_EXSTYLE);
+    if (style & WS_EX_NOACTIVATE) {
+        nCmdShow = SW_SHOWNOACTIVATE;
+    }
+    ShowWindow(hwnd, nCmdShow);
+}
+
+void
+WIN_HideWindow(_THIS, SDL_Window * window)
+{
+    HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
+    ShowWindow(hwnd, SW_HIDE);
+}
+
+void
+WIN_RaiseWindow(_THIS, SDL_Window * window)
+{
+    HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
+    SetForegroundWindow(hwnd);
+}
+
+void
+WIN_MaximizeWindow(_THIS, SDL_Window * window)
+{
+    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
+    HWND hwnd = data->hwnd;
+    data->expected_resize = SDL_TRUE;
+    ShowWindow(hwnd, SW_MAXIMIZE);
+    data->expected_resize = SDL_FALSE;
+}
+
+void
+WIN_MinimizeWindow(_THIS, SDL_Window * window)
+{
+    HWND hwnd = ((SDL_WindowData *) window->driverdata)->hwnd;
+    ShowWindow(hwnd, SW_MINIMIZE);
+}
+
+void
+WIN_SetWindowBordered(_THIS, SDL_Window * window, SDL_bool bordered)
+{
+    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
+    HWND hwnd = data->hwnd;
+    DWORD style;
+
+    style = GetWindowLong(hwnd, GWL_STYLE);
+    style &= ~STYLE_MASK;
+    style |= GetWindowStyle(window);
+
+    data->in_border_change = SDL_TRUE;
+    SetWindowLong(hwnd, GWL_STYLE, style);
+    WIN_SetWindowPositionInternal(_this, window, SWP_NOCOPYBITS | SWP_FRAMECHANGED | SWP_NOZORDER | SWP_NOACTIVATE);
+    data->in_border_change = SDL_FALSE;
+}
+
+void
+WIN_SetWindowResizable(_THIS, SDL_Window * window, SDL_bool resizable)
+{
+    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
+    HWND hwnd = data->hwnd;
+    DWORD style;
+
+    style = GetWindowLong(hwnd, GWL_STYLE);
+    style &= ~STYLE_MASK;
+    style |= GetWindowStyle(window);
+
+    SetWindowLong(hwnd, GWL_STYLE, style);
+}
+
+void
+WIN_RestoreWindow(_THIS, SDL_Window * window)
+{
+    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
+    HWND hwnd = data->hwnd;
+    data->expected_resize = SDL_TRUE;
+    ShowWindow(hwnd, SW_RESTORE);
+    data->expected_resize = SDL_FALSE;
+}
+
+void
+WIN_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen)
+{
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+    HWND hwnd = data->hwnd;
+    SDL_Rect bounds;
+    DWORD style;
+    HWND top;
+    int x, y;
+    int w, h;
+
+    if (SDL_ShouldAllowTopmost() && ((window->flags & (SDL_WINDOW_FULLSCREEN|SDL_WINDOW_INPUT_FOCUS)) == (SDL_WINDOW_FULLSCREEN|SDL_WINDOW_INPUT_FOCUS) || window->flags & SDL_WINDOW_ALWAYS_ON_TOP)) {
+        top = HWND_TOPMOST;
+    } else {
+        top = HWND_NOTOPMOST;
+    }
+
+    style = GetWindowLong(hwnd, GWL_STYLE);
+    style &= ~STYLE_MASK;
+    style |= GetWindowStyle(window);
+
+    WIN_GetDisplayBounds(_this, display, &bounds);
+
+    if (fullscreen) {
+        x = bounds.x;
+        y = bounds.y;
+        w = bounds.w;
+        h = bounds.h;
+
+        /* Unset the maximized flag.  This fixes
+           https://bugzilla.libsdl.org/show_bug.cgi?id=3215
+        */
+        if (style & WS_MAXIMIZE) {
+            data->windowed_mode_was_maximized = SDL_TRUE;
+            style &= ~WS_MAXIMIZE;
+        }
+    } else {
+        BOOL menu;
+
+        /* Restore window-maximization state, as applicable.
+           Special care is taken to *not* do this if and when we're
+           alt-tab'ing away (to some other window; as indicated by
+           in_window_deactivation), otherwise
+           https://bugzilla.libsdl.org/show_bug.cgi?id=3215 can reproduce!
+        */
+        if (data->windowed_mode_was_maximized && !data->in_window_deactivation) {
+            style |= WS_MAXIMIZE;
+            data->windowed_mode_was_maximized = SDL_FALSE;
+        }
+
+        menu = (style & WS_CHILDWINDOW) ? FALSE : (GetMenu(hwnd) != NULL);
+        WIN_AdjustWindowRectWithStyle(window, style, menu, &x, &y, &w, &h, SDL_FALSE);
+    }
+    SetWindowLong(hwnd, GWL_STYLE, style);
+    data->expected_resize = SDL_TRUE;
+    SetWindowPos(hwnd, top, x, y, w, h, SWP_NOCOPYBITS | SWP_NOACTIVATE);
+    data->expected_resize = SDL_FALSE;
+}
+
+int
+WIN_SetWindowGammaRamp(_THIS, SDL_Window * window, const Uint16 * ramp)
+{
+    SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
+    SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;
+    HDC hdc;
+    BOOL succeeded = FALSE;
+
+    hdc = CreateDC(data->DeviceName, NULL, NULL, NULL);
+    if (hdc) {
+        succeeded = SetDeviceGammaRamp(hdc, (LPVOID)ramp);
+        if (!succeeded) {
+            WIN_SetError("SetDeviceGammaRamp()");
+        }
+        DeleteDC(hdc);
+    }
+    return succeeded ? 0 : -1;
+}
+
+int
+WIN_GetWindowGammaRamp(_THIS, SDL_Window * window, Uint16 * ramp)
+{
+    SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
+    SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;
+    HDC hdc;
+    BOOL succeeded = FALSE;
+
+    hdc = CreateDC(data->DeviceName, NULL, NULL, NULL);
+    if (hdc) {
+        succeeded = GetDeviceGammaRamp(hdc, (LPVOID)ramp);
+        if (!succeeded) {
+            WIN_SetError("GetDeviceGammaRamp()");
+        }
+        DeleteDC(hdc);
+    }
+    return succeeded ? 0 : -1;
+}
+
+void
+WIN_SetWindowGrab(_THIS, SDL_Window * window, SDL_bool grabbed)
+{
+    WIN_UpdateClipCursor(window);
+
+    if (window->flags & SDL_WINDOW_FULLSCREEN) {
+        UINT flags = SWP_NOCOPYBITS | SWP_NOMOVE | SWP_NOSIZE;
+
+        if (!(window->flags & SDL_WINDOW_SHOWN)) {
+            flags |= SWP_NOACTIVATE;
+        }
+        WIN_SetWindowPositionInternal(_this, window, flags);
+    }
+}
+
+void
+WIN_DestroyWindow(_THIS, SDL_Window * window)
+{
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+
+    if (data) {
+        ReleaseDC(data->hwnd, data->hdc);
+        RemoveProp(data->hwnd, TEXT("SDL_WindowData"));
+        if (data->created) {
+            DestroyWindow(data->hwnd);
+            if (data->parent) {
+                DestroyWindow(data->parent);
+            }
+        } else {
+            /* Restore any original event handler... */
+            if (data->wndproc != NULL) {
+#ifdef GWLP_WNDPROC
+                SetWindowLongPtr(data->hwnd, GWLP_WNDPROC,
+                                 (LONG_PTR) data->wndproc);
+#else
+                SetWindowLong(data->hwnd, GWL_WNDPROC,
+                              (LONG_PTR) data->wndproc);
+#endif
+            }
+        }
+        SDL_free(data);
+    }
+    window->driverdata = NULL;
+}
+
+SDL_bool
+WIN_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info)
+{
+    const SDL_WindowData *data = (const SDL_WindowData *) window->driverdata;
+    if (info->version.major <= SDL_MAJOR_VERSION) {
+        int versionnum = SDL_VERSIONNUM(info->version.major, info->version.minor, info->version.patch);
+
+        info->subsystem = SDL_SYSWM_WINDOWS;
+        info->info.win.window = data->hwnd;
+
+        if (versionnum >= SDL_VERSIONNUM(2, 0, 4)) {
+            info->info.win.hdc = data->hdc;
+        }
+
+        if (versionnum >= SDL_VERSIONNUM(2, 0, 5)) {
+            info->info.win.hinstance = data->hinstance;
+        }
+
+        return SDL_TRUE;
+    } else {
+        SDL_SetError("Application not compiled with SDL %d.%d",
+                     SDL_MAJOR_VERSION, SDL_MINOR_VERSION);
+        return SDL_FALSE;
+    }
+}
+
+
+/*
+ * Creates a HelperWindow used for DirectInput events.
+ */
+int
+SDL_HelperWindowCreate(void)
+{
+    HINSTANCE hInstance = GetModuleHandle(NULL);
+    WNDCLASS wce;
+
+    /* Make sure window isn't created twice. */
+    if (SDL_HelperWindow != NULL) {
+        return 0;
+    }
+
+    /* Create the class. */
+    SDL_zero(wce);
+    wce.lpfnWndProc = DefWindowProc;
+    wce.lpszClassName = (LPCWSTR) SDL_HelperWindowClassName;
+    wce.hInstance = hInstance;
+
+    /* Register the class. */
+    SDL_HelperWindowClass = RegisterClass(&wce);
+    if (SDL_HelperWindowClass == 0 && GetLastError() != ERROR_CLASS_ALREADY_EXISTS) {
+        return WIN_SetError("Unable to create Helper Window Class");
+    }
+
+    /* Create the window. */
+    SDL_HelperWindow = CreateWindowEx(0, SDL_HelperWindowClassName,
+                                      SDL_HelperWindowName,
+                                      WS_OVERLAPPED, CW_USEDEFAULT,
+                                      CW_USEDEFAULT, CW_USEDEFAULT,
+                                      CW_USEDEFAULT, HWND_MESSAGE, NULL,
+                                      hInstance, NULL);
+    if (SDL_HelperWindow == NULL) {
+        UnregisterClass(SDL_HelperWindowClassName, hInstance);
+        return WIN_SetError("Unable to create Helper Window");
+    }
+
+    return 0;
+}
+
+
+/*
+ * Destroys the HelperWindow previously created with SDL_HelperWindowCreate.
+ */
+void
+SDL_HelperWindowDestroy(void)
+{
+    HINSTANCE hInstance = GetModuleHandle(NULL);
+
+    /* Destroy the window. */
+    if (SDL_HelperWindow != NULL) {
+        if (DestroyWindow(SDL_HelperWindow) == 0) {
+            WIN_SetError("Unable to destroy Helper Window");
+            return;
+        }
+        SDL_HelperWindow = NULL;
+    }
+
+    /* Unregister the class. */
+    if (SDL_HelperWindowClass != 0) {
+        if ((UnregisterClass(SDL_HelperWindowClassName, hInstance)) == 0) {
+            WIN_SetError("Unable to destroy Helper Window Class");
+            return;
+        }
+        SDL_HelperWindowClass = 0;
+    }
+}
+
+void WIN_OnWindowEnter(_THIS, SDL_Window * window)
+{
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+
+    if (!data || !data->hwnd) {
+        /* The window wasn't fully initialized */
+        return;
+    }
+
+    if (window->flags & SDL_WINDOW_ALWAYS_ON_TOP) {
+        WIN_SetWindowPositionInternal(_this, window, SWP_NOCOPYBITS | SWP_NOSIZE | SWP_NOACTIVATE);
+    }
+
+#ifdef WM_MOUSELEAVE
+    {
+        TRACKMOUSEEVENT trackMouseEvent;
+
+        trackMouseEvent.cbSize = sizeof(TRACKMOUSEEVENT);
+        trackMouseEvent.dwFlags = TME_LEAVE;
+        trackMouseEvent.hwndTrack = data->hwnd;
+
+        TrackMouseEvent(&trackMouseEvent);
+    }
+#endif /* WM_MOUSELEAVE */
+}
+
+void
+WIN_UpdateClipCursor(SDL_Window *window)
+{
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+    SDL_Mouse *mouse = SDL_GetMouse();
+    RECT rect;
+
+    if (data->in_title_click || data->focus_click_pending) {
+        return;
+    }
+    if (data->skip_update_clipcursor) {
+        data->skip_update_clipcursor = SDL_FALSE;
+        return;
+    }
+
+    if ((mouse->relative_mode || (window->flags & SDL_WINDOW_INPUT_GRABBED)) &&
+        (window->flags & SDL_WINDOW_INPUT_FOCUS)) {
+        if (mouse->relative_mode && !mouse->relative_mode_warp) {
+            LONG cx, cy;
+            GetWindowRect(data->hwnd, &rect);
+
+            cx = (rect.left + rect.right) / 2;
+            cy = (rect.top + rect.bottom) / 2;
+
+            /* Make an absurdly small clip rect */
+            rect.left = cx - 1;
+            rect.right = cx + 1;
+            rect.top = cy - 1;
+            rect.bottom = cy + 1;
+
+            if (ClipCursor(&rect)) {
+                data->cursor_clipped_rect = rect;
+            }
+        } else {
+            if (GetClientRect(data->hwnd, &rect) && !IsRectEmpty(&rect)) {
+                ClientToScreen(data->hwnd, (LPPOINT) & rect);
+                ClientToScreen(data->hwnd, (LPPOINT) & rect + 1);
+                if (ClipCursor(&rect)) {
+                    data->cursor_clipped_rect = rect;
+                }
+            }
+        }
+    } else if (GetClipCursor(&rect) && SDL_memcmp(&rect, &data->cursor_clipped_rect, sizeof(rect)) == 0) {
+        ClipCursor(NULL);
+        SDL_zero(data->cursor_clipped_rect);
+    }
+}
+
+int
+WIN_SetWindowHitTest(SDL_Window *window, SDL_bool enabled)
+{
+    return 0;  /* just succeed, the real work is done elsewhere. */
+}
+
+int
+WIN_SetWindowOpacity(_THIS, SDL_Window * window, float opacity)
+{
+    const SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+    const HWND hwnd = data->hwnd;
+    const LONG style = GetWindowLong(hwnd, GWL_EXSTYLE);
+
+    SDL_assert(style != 0);
+
+    if (opacity == 1.0f) {
+        /* want it fully opaque, just mark it unlayered if necessary. */
+        if (style & WS_EX_LAYERED) {
+            if (SetWindowLong(hwnd, GWL_EXSTYLE, style & ~WS_EX_LAYERED) == 0) {
+                return WIN_SetError("SetWindowLong()");
+            }
+        }
+    } else {
+        const BYTE alpha = (BYTE) ((int) (opacity * 255.0f));
+        /* want it transparent, mark it layered if necessary. */
+        if ((style & WS_EX_LAYERED) == 0) {
+            if (SetWindowLong(hwnd, GWL_EXSTYLE, style | WS_EX_LAYERED) == 0) {
+                return WIN_SetError("SetWindowLong()");
+            }
+        }
+
+        if (SetLayeredWindowAttributes(hwnd, 0, alpha, LWA_ALPHA) == 0) {
+            return WIN_SetError("SetLayeredWindowAttributes()");
+        }
+    }
+
+    return 0;
+}
+
+void
+WIN_AcceptDragAndDrop(SDL_Window * window, SDL_bool accept)
+{
+    const SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+    DragAcceptFiles(data->hwnd, accept ? TRUE : FALSE);
+}
+
+#endif /* SDL_VIDEO_DRIVER_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/SDL_windowswindow.h b/source/3rd-party/SDL2/src/video/windows/SDL_windowswindow.h
new file mode 100644
index 0000000..b738c34
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/SDL_windowswindow.h
@@ -0,0 +1,87 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_windowswindow_h_
+#define SDL_windowswindow_h_
+
+#if SDL_VIDEO_OPENGL_EGL   
+#include "../SDL_egl_c.h"
+#endif
+
+typedef struct
+{
+    SDL_Window *window;
+    HWND hwnd;
+    HWND parent;
+    HDC hdc;
+    HDC mdc;
+    HINSTANCE hinstance;
+    HBITMAP hbm;
+    WNDPROC wndproc;
+    SDL_bool created;
+    WPARAM mouse_button_flags;
+    SDL_bool initializing;
+    SDL_bool expected_resize;
+    SDL_bool in_border_change;
+    SDL_bool in_title_click;
+    Uint8 focus_click_pending;
+    SDL_bool skip_update_clipcursor;
+    SDL_bool windowed_mode_was_maximized;
+    SDL_bool in_window_deactivation;
+    RECT cursor_clipped_rect;
+    struct SDL_VideoData *videodata;
+#if SDL_VIDEO_OPENGL_EGL  
+    EGLSurface egl_surface;
+#endif
+} SDL_WindowData;
+
+extern int WIN_CreateWindow(_THIS, SDL_Window * window);
+extern int WIN_CreateWindowFrom(_THIS, SDL_Window * window, const void *data);
+extern void WIN_SetWindowTitle(_THIS, SDL_Window * window);
+extern void WIN_SetWindowIcon(_THIS, SDL_Window * window, SDL_Surface * icon);
+extern void WIN_SetWindowPosition(_THIS, SDL_Window * window);
+extern void WIN_SetWindowSize(_THIS, SDL_Window * window);
+extern int WIN_GetWindowBordersSize(_THIS, SDL_Window * window, int *top, int *left, int *bottom, int *right);
+extern int WIN_SetWindowOpacity(_THIS, SDL_Window * window, float opacity);
+extern void WIN_ShowWindow(_THIS, SDL_Window * window);
+extern void WIN_HideWindow(_THIS, SDL_Window * window);
+extern void WIN_RaiseWindow(_THIS, SDL_Window * window);
+extern void WIN_MaximizeWindow(_THIS, SDL_Window * window);
+extern void WIN_MinimizeWindow(_THIS, SDL_Window * window);
+extern void WIN_RestoreWindow(_THIS, SDL_Window * window);
+extern void WIN_SetWindowBordered(_THIS, SDL_Window * window, SDL_bool bordered);
+extern void WIN_SetWindowResizable(_THIS, SDL_Window * window, SDL_bool resizable);
+extern void WIN_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen);
+extern int WIN_SetWindowGammaRamp(_THIS, SDL_Window * window, const Uint16 * ramp);
+extern int WIN_GetWindowGammaRamp(_THIS, SDL_Window * window, Uint16 * ramp);
+extern void WIN_SetWindowGrab(_THIS, SDL_Window * window, SDL_bool grabbed);
+extern void WIN_DestroyWindow(_THIS, SDL_Window * window);
+extern SDL_bool WIN_GetWindowWMInfo(_THIS, SDL_Window * window,
+                                    struct SDL_SysWMinfo *info);
+extern void WIN_OnWindowEnter(_THIS, SDL_Window * window);
+extern void WIN_UpdateClipCursor(SDL_Window *window);
+extern int WIN_SetWindowHitTest(SDL_Window *window, SDL_bool enabled);
+extern void WIN_AcceptDragAndDrop(SDL_Window * window, SDL_bool accept);
+
+#endif /* SDL_windowswindow_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/windows/wmmsg.h b/source/3rd-party/SDL2/src/video/windows/wmmsg.h
new file mode 100644
index 0000000..19c1bf4
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/windows/wmmsg.h
@@ -0,0 +1,1052 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#define MAX_WMMSG   (sizeof(wmtab)/sizeof(wmtab[0]))
+
+char *wmtab[] = {
+    "WM_NULL",
+    "WM_CREATE",
+    "WM_DESTROY",
+    "WM_MOVE",
+    "UNKNOWN (4)",
+    "WM_SIZE",
+    "WM_ACTIVATE",
+    "WM_SETFOCUS",
+    "WM_KILLFOCUS",
+    "UNKNOWN (9)",
+    "WM_ENABLE",
+    "WM_SETREDRAW",
+    "WM_SETTEXT",
+    "WM_GETTEXT",
+    "WM_GETTEXTLENGTH",
+    "WM_PAINT",
+    "WM_CLOSE",
+    "WM_QUERYENDSESSION",
+    "WM_QUIT",
+    "WM_QUERYOPEN",
+    "WM_ERASEBKGND",
+    "WM_SYSCOLORCHANGE",
+    "WM_ENDSESSION",
+    "UNKNOWN (23)",
+    "WM_SHOWWINDOW",
+    "UNKNOWN (25)",
+    "WM_SETTINGCHANGE",
+    "WM_DEVMODECHANGE",
+    "WM_ACTIVATEAPP",
+    "WM_FONTCHANGE",
+    "WM_TIMECHANGE",
+    "WM_CANCELMODE",
+    "WM_SETCURSOR",
+    "WM_MOUSEACTIVATE",
+    "WM_CHILDACTIVATE",
+    "WM_QUEUESYNC",
+    "WM_GETMINMAXINFO",
+    "UNKNOWN (37)",
+    "WM_PAINTICON",
+    "WM_ICONERASEBKGND",
+    "WM_NEXTDLGCTL",
+    "UNKNOWN (41)",
+    "WM_SPOOLERSTATUS",
+    "WM_DRAWITEM",
+    "WM_MEASUREITEM",
+    "WM_DELETEITEM",
+    "WM_VKEYTOITEM",
+    "WM_CHARTOITEM",
+    "WM_SETFONT",
+    "WM_GETFONT",
+    "WM_SETHOTKEY",
+    "WM_GETHOTKEY",
+    "UNKNOWN (52)",
+    "UNKNOWN (53)",
+    "UNKNOWN (54)",
+    "WM_QUERYDRAGICON",
+    "UNKNOWN (56)",
+    "WM_COMPAREITEM",
+    "UNKNOWN (58)",
+    "UNKNOWN (59)",
+    "UNKNOWN (60)",
+    "WM_GETOBJECT",
+    "UNKNOWN (62)",
+    "UNKNOWN (63)",
+    "UNKNOWN (64)",
+    "WM_COMPACTING",
+    "UNKNOWN (66)",
+    "UNKNOWN (67)",
+    "WM_COMMNOTIFY",
+    "UNKNOWN (69)",
+    "WM_WINDOWPOSCHANGING",
+    "WM_WINDOWPOSCHANGED",
+    "WM_POWER",
+    "UNKNOWN (73)",
+    "WM_COPYDATA",
+    "WM_CANCELJOURNAL",
+    "UNKNOWN (76)",
+    "UNKNOWN (77)",
+    "WM_NOTIFY",
+    "UNKNOWN (79)",
+    "WM_INPUTLANGCHANGEREQUEST",
+    "WM_INPUTLANGCHANGE",
+    "WM_TCARD",
+    "WM_HELP",
+    "WM_USERCHANGED",
+    "WM_NOTIFYFORMAT",
+    "UNKNOWN (86)",
+    "UNKNOWN (87)",
+    "UNKNOWN (88)",
+    "UNKNOWN (89)",
+    "UNKNOWN (90)",
+    "UNKNOWN (91)",
+    "UNKNOWN (92)",
+    "UNKNOWN (93)",
+    "UNKNOWN (94)",
+    "UNKNOWN (95)",
+    "UNKNOWN (96)",
+    "UNKNOWN (97)",
+    "UNKNOWN (98)",
+    "UNKNOWN (99)",
+    "UNKNOWN (100)",
+    "UNKNOWN (101)",
+    "UNKNOWN (102)",
+    "UNKNOWN (103)",
+    "UNKNOWN (104)",
+    "UNKNOWN (105)",
+    "UNKNOWN (106)",
+    "UNKNOWN (107)",
+    "UNKNOWN (108)",
+    "UNKNOWN (109)",
+    "UNKNOWN (110)",
+    "UNKNOWN (111)",
+    "UNKNOWN (112)",
+    "UNKNOWN (113)",
+    "UNKNOWN (114)",
+    "UNKNOWN (115)",
+    "UNKNOWN (116)",
+    "UNKNOWN (117)",
+    "UNKNOWN (118)",
+    "UNKNOWN (119)",
+    "UNKNOWN (120)",
+    "UNKNOWN (121)",
+    "UNKNOWN (122)",
+    "WM_CONTEXTMENU",
+    "WM_STYLECHANGING",
+    "WM_STYLECHANGED",
+    "WM_DISPLAYCHANGE",
+    "WM_GETICON",
+    "WM_SETICON",
+    "WM_NCCREATE",
+    "WM_NCDESTROY",
+    "WM_NCCALCSIZE",
+    "WM_NCHITTEST",
+    "WM_NCPAINT",
+    "WM_NCACTIVATE",
+    "WM_GETDLGCODE",
+    "WM_SYNCPAINT",
+    "UNKNOWN (137)",
+    "UNKNOWN (138)",
+    "UNKNOWN (139)",
+    "UNKNOWN (140)",
+    "UNKNOWN (141)",
+    "UNKNOWN (142)",
+    "UNKNOWN (143)",
+    "UNKNOWN (144)",
+    "UNKNOWN (145)",
+    "UNKNOWN (146)",
+    "UNKNOWN (147)",
+    "UNKNOWN (148)",
+    "UNKNOWN (149)",
+    "UNKNOWN (150)",
+    "UNKNOWN (151)",
+    "UNKNOWN (152)",
+    "UNKNOWN (153)",
+    "UNKNOWN (154)",
+    "UNKNOWN (155)",
+    "UNKNOWN (156)",
+    "UNKNOWN (157)",
+    "UNKNOWN (158)",
+    "UNKNOWN (159)",
+    "WM_NCMOUSEMOVE",
+    "WM_NCLBUTTONDOWN",
+    "WM_NCLBUTTONUP",
+    "WM_NCLBUTTONDBLCLK",
+    "WM_NCRBUTTONDOWN",
+    "WM_NCRBUTTONUP",
+    "WM_NCRBUTTONDBLCLK",
+    "WM_NCMBUTTONDOWN",
+    "WM_NCMBUTTONUP",
+    "WM_NCMBUTTONDBLCLK",
+    "UNKNOWN (170)",
+    "WM_NCXBUTTONDOWN",
+    "WM_NCXBUTTONUP",
+    "WM_NCXBUTTONDBLCLK",
+    "WM_NCUAHDRAWCAPTION",
+    "WM_NCUAHDRAWFRAME",
+    "UNKNOWN (176)",
+    "UNKNOWN (177)",
+    "UNKNOWN (178)",
+    "UNKNOWN (179)",
+    "UNKNOWN (180)",
+    "UNKNOWN (181)",
+    "UNKNOWN (182)",
+    "UNKNOWN (183)",
+    "UNKNOWN (184)",
+    "UNKNOWN (185)",
+    "UNKNOWN (186)",
+    "UNKNOWN (187)",
+    "UNKNOWN (188)",
+    "UNKNOWN (189)",
+    "UNKNOWN (190)",
+    "UNKNOWN (191)",
+    "UNKNOWN (192)",
+    "UNKNOWN (193)",
+    "UNKNOWN (194)",
+    "UNKNOWN (195)",
+    "UNKNOWN (196)",
+    "UNKNOWN (197)",
+    "UNKNOWN (198)",
+    "UNKNOWN (199)",
+    "UNKNOWN (200)",
+    "UNKNOWN (201)",
+    "UNKNOWN (202)",
+    "UNKNOWN (203)",
+    "UNKNOWN (204)",
+    "UNKNOWN (205)",
+    "UNKNOWN (206)",
+    "UNKNOWN (207)",
+    "UNKNOWN (208)",
+    "UNKNOWN (209)",
+    "UNKNOWN (210)",
+    "UNKNOWN (211)",
+    "UNKNOWN (212)",
+    "UNKNOWN (213)",
+    "UNKNOWN (214)",
+    "UNKNOWN (215)",
+    "UNKNOWN (216)",
+    "UNKNOWN (217)",
+    "UNKNOWN (218)",
+    "UNKNOWN (219)",
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+    "UNKNOWN (990)",
+    "UNKNOWN (991)",
+    "UNKNOWN (992)",
+    "UNKNOWN (993)",
+    "UNKNOWN (994)",
+    "UNKNOWN (995)",
+    "UNKNOWN (996)",
+    "UNKNOWN (997)",
+    "UNKNOWN (998)",
+    "UNKNOWN (999)",
+    "UNKNOWN (1000)",
+    "UNKNOWN (1001)",
+    "UNKNOWN (1002)",
+    "UNKNOWN (1003)",
+    "UNKNOWN (1004)",
+    "UNKNOWN (1005)",
+    "UNKNOWN (1006)",
+    "UNKNOWN (1007)",
+    "UNKNOWN (1008)",
+    "UNKNOWN (1009)",
+    "UNKNOWN (1010)",
+    "UNKNOWN (1011)",
+    "UNKNOWN (1012)",
+    "UNKNOWN (1013)",
+    "UNKNOWN (1014)",
+    "UNKNOWN (1015)",
+    "UNKNOWN (1016)",
+    "UNKNOWN (1017)",
+    "UNKNOWN (1018)",
+    "UNKNOWN (1019)",
+    "UNKNOWN (1020)",
+    "UNKNOWN (1021)",
+    "UNKNOWN (1022)",
+    "UNKNOWN (1023)",
+    "WM_USER"
+};
+
+/* vi: set ts=4 sw=4 expandtab: */