*initHEADmaster

1 files changed, 1236 insertions, 0 deletions

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: */