*initHEADmaster

10 files changed, 1865 insertions, 0 deletions

diff --git a/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenevents.c b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenevents.c
new file mode 100644
index 0000000..14bc240
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenevents.c
@@ -0,0 +1,716 @@
+/*
+  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_EMSCRIPTEN
+
+#include <emscripten/html5.h>
+
+#include "../../events/SDL_events_c.h"
+#include "../../events/SDL_keyboard_c.h"
+#include "../../events/SDL_touch_c.h"
+
+#include "SDL_emscriptenevents.h"
+#include "SDL_emscriptenvideo.h"
+
+#include "SDL_hints.h"
+
+#define FULLSCREEN_MASK ( SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN )
+
+/*
+.keyCode to scancode
+https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent
+https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode
+*/
+static const SDL_Scancode emscripten_scancode_table[] = {
+    /*  0 */    SDL_SCANCODE_UNKNOWN,
+    /*  1 */    SDL_SCANCODE_UNKNOWN,
+    /*  2 */    SDL_SCANCODE_UNKNOWN,
+    /*  3 */    SDL_SCANCODE_CANCEL,
+    /*  4 */    SDL_SCANCODE_UNKNOWN,
+    /*  5 */    SDL_SCANCODE_UNKNOWN,
+    /*  6 */    SDL_SCANCODE_HELP,
+    /*  7 */    SDL_SCANCODE_UNKNOWN,
+    /*  8 */    SDL_SCANCODE_BACKSPACE,
+    /*  9 */    SDL_SCANCODE_TAB,
+    /*  10 */   SDL_SCANCODE_UNKNOWN,
+    /*  11 */   SDL_SCANCODE_UNKNOWN,
+    /*  12 */   SDL_SCANCODE_UNKNOWN,
+    /*  13 */   SDL_SCANCODE_RETURN,
+    /*  14 */   SDL_SCANCODE_UNKNOWN,
+    /*  15 */   SDL_SCANCODE_UNKNOWN,
+    /*  16 */   SDL_SCANCODE_LSHIFT,
+    /*  17 */   SDL_SCANCODE_LCTRL,
+    /*  18 */   SDL_SCANCODE_LALT,
+    /*  19 */   SDL_SCANCODE_PAUSE,
+    /*  20 */   SDL_SCANCODE_CAPSLOCK,
+    /*  21 */   SDL_SCANCODE_UNKNOWN,
+    /*  22 */   SDL_SCANCODE_UNKNOWN,
+    /*  23 */   SDL_SCANCODE_UNKNOWN,
+    /*  24 */   SDL_SCANCODE_UNKNOWN,
+    /*  25 */   SDL_SCANCODE_UNKNOWN,
+    /*  26 */   SDL_SCANCODE_UNKNOWN,
+    /*  27 */   SDL_SCANCODE_ESCAPE,
+    /*  28 */   SDL_SCANCODE_UNKNOWN,
+    /*  29 */   SDL_SCANCODE_UNKNOWN,
+    /*  30 */   SDL_SCANCODE_UNKNOWN,
+    /*  31 */   SDL_SCANCODE_UNKNOWN,
+    /*  32 */   SDL_SCANCODE_SPACE,
+    /*  33 */   SDL_SCANCODE_PAGEUP,
+    /*  34 */   SDL_SCANCODE_PAGEDOWN,
+    /*  35 */   SDL_SCANCODE_END,
+    /*  36 */   SDL_SCANCODE_HOME,
+    /*  37 */   SDL_SCANCODE_LEFT,
+    /*  38 */   SDL_SCANCODE_UP,
+    /*  39 */   SDL_SCANCODE_RIGHT,
+    /*  40 */   SDL_SCANCODE_DOWN,
+    /*  41 */   SDL_SCANCODE_UNKNOWN,
+    /*  42 */   SDL_SCANCODE_UNKNOWN,
+    /*  43 */   SDL_SCANCODE_UNKNOWN,
+    /*  44 */   SDL_SCANCODE_UNKNOWN,
+    /*  45 */   SDL_SCANCODE_INSERT,
+    /*  46 */   SDL_SCANCODE_DELETE,
+    /*  47 */   SDL_SCANCODE_UNKNOWN,
+    /*  48 */   SDL_SCANCODE_0,
+    /*  49 */   SDL_SCANCODE_1,
+    /*  50 */   SDL_SCANCODE_2,
+    /*  51 */   SDL_SCANCODE_3,
+    /*  52 */   SDL_SCANCODE_4,
+    /*  53 */   SDL_SCANCODE_5,
+    /*  54 */   SDL_SCANCODE_6,
+    /*  55 */   SDL_SCANCODE_7,
+    /*  56 */   SDL_SCANCODE_8,
+    /*  57 */   SDL_SCANCODE_9,
+    /*  58 */   SDL_SCANCODE_UNKNOWN,
+    /*  59 */   SDL_SCANCODE_SEMICOLON,
+    /*  60 */   SDL_SCANCODE_UNKNOWN,
+    /*  61 */   SDL_SCANCODE_EQUALS,
+    /*  62 */   SDL_SCANCODE_UNKNOWN,
+    /*  63 */   SDL_SCANCODE_UNKNOWN,
+    /*  64 */   SDL_SCANCODE_UNKNOWN,
+    /*  65 */   SDL_SCANCODE_A,
+    /*  66 */   SDL_SCANCODE_B,
+    /*  67 */   SDL_SCANCODE_C,
+    /*  68 */   SDL_SCANCODE_D,
+    /*  69 */   SDL_SCANCODE_E,
+    /*  70 */   SDL_SCANCODE_F,
+    /*  71 */   SDL_SCANCODE_G,
+    /*  72 */   SDL_SCANCODE_H,
+    /*  73 */   SDL_SCANCODE_I,
+    /*  74 */   SDL_SCANCODE_J,
+    /*  75 */   SDL_SCANCODE_K,
+    /*  76 */   SDL_SCANCODE_L,
+    /*  77 */   SDL_SCANCODE_M,
+    /*  78 */   SDL_SCANCODE_N,
+    /*  79 */   SDL_SCANCODE_O,
+    /*  80 */   SDL_SCANCODE_P,
+    /*  81 */   SDL_SCANCODE_Q,
+    /*  82 */   SDL_SCANCODE_R,
+    /*  83 */   SDL_SCANCODE_S,
+    /*  84 */   SDL_SCANCODE_T,
+    /*  85 */   SDL_SCANCODE_U,
+    /*  86 */   SDL_SCANCODE_V,
+    /*  87 */   SDL_SCANCODE_W,
+    /*  88 */   SDL_SCANCODE_X,
+    /*  89 */   SDL_SCANCODE_Y,
+    /*  90 */   SDL_SCANCODE_Z,
+    /*  91 */   SDL_SCANCODE_LGUI,
+    /*  92 */   SDL_SCANCODE_UNKNOWN,
+    /*  93 */   SDL_SCANCODE_APPLICATION,
+    /*  94 */   SDL_SCANCODE_UNKNOWN,
+    /*  95 */   SDL_SCANCODE_UNKNOWN,
+    /*  96 */   SDL_SCANCODE_KP_0,
+    /*  97 */   SDL_SCANCODE_KP_1,
+    /*  98 */   SDL_SCANCODE_KP_2,
+    /*  99 */   SDL_SCANCODE_KP_3,
+    /* 100 */   SDL_SCANCODE_KP_4,
+    /* 101 */   SDL_SCANCODE_KP_5,
+    /* 102 */   SDL_SCANCODE_KP_6,
+    /* 103 */   SDL_SCANCODE_KP_7,
+    /* 104 */   SDL_SCANCODE_KP_8,
+    /* 105 */   SDL_SCANCODE_KP_9,
+    /* 106 */   SDL_SCANCODE_KP_MULTIPLY,
+    /* 107 */   SDL_SCANCODE_KP_PLUS,
+    /* 108 */   SDL_SCANCODE_UNKNOWN,
+    /* 109 */   SDL_SCANCODE_KP_MINUS,
+    /* 110 */   SDL_SCANCODE_KP_PERIOD,
+    /* 111 */   SDL_SCANCODE_KP_DIVIDE,
+    /* 112 */   SDL_SCANCODE_F1,
+    /* 113 */   SDL_SCANCODE_F2,
+    /* 114 */   SDL_SCANCODE_F3,
+    /* 115 */   SDL_SCANCODE_F4,
+    /* 116 */   SDL_SCANCODE_F5,
+    /* 117 */   SDL_SCANCODE_F6,
+    /* 118 */   SDL_SCANCODE_F7,
+    /* 119 */   SDL_SCANCODE_F8,
+    /* 120 */   SDL_SCANCODE_F9,
+    /* 121 */   SDL_SCANCODE_F10,
+    /* 122 */   SDL_SCANCODE_F11,
+    /* 123 */   SDL_SCANCODE_F12,
+    /* 124 */   SDL_SCANCODE_F13,
+    /* 125 */   SDL_SCANCODE_F14,
+    /* 126 */   SDL_SCANCODE_F15,
+    /* 127 */   SDL_SCANCODE_F16,
+    /* 128 */   SDL_SCANCODE_F17,
+    /* 129 */   SDL_SCANCODE_F18,
+    /* 130 */   SDL_SCANCODE_F19,
+    /* 131 */   SDL_SCANCODE_F20,
+    /* 132 */   SDL_SCANCODE_F21,
+    /* 133 */   SDL_SCANCODE_F22,
+    /* 134 */   SDL_SCANCODE_F23,
+    /* 135 */   SDL_SCANCODE_F24,
+    /* 136 */   SDL_SCANCODE_UNKNOWN,
+    /* 137 */   SDL_SCANCODE_UNKNOWN,
+    /* 138 */   SDL_SCANCODE_UNKNOWN,
+    /* 139 */   SDL_SCANCODE_UNKNOWN,
+    /* 140 */   SDL_SCANCODE_UNKNOWN,
+    /* 141 */   SDL_SCANCODE_UNKNOWN,
+    /* 142 */   SDL_SCANCODE_UNKNOWN,
+    /* 143 */   SDL_SCANCODE_UNKNOWN,
+    /* 144 */   SDL_SCANCODE_NUMLOCKCLEAR,
+    /* 145 */   SDL_SCANCODE_SCROLLLOCK,
+    /* 146 */   SDL_SCANCODE_UNKNOWN,
+    /* 147 */   SDL_SCANCODE_UNKNOWN,
+    /* 148 */   SDL_SCANCODE_UNKNOWN,
+    /* 149 */   SDL_SCANCODE_UNKNOWN,
+    /* 150 */   SDL_SCANCODE_UNKNOWN,
+    /* 151 */   SDL_SCANCODE_UNKNOWN,
+    /* 152 */   SDL_SCANCODE_UNKNOWN,
+    /* 153 */   SDL_SCANCODE_UNKNOWN,
+    /* 154 */   SDL_SCANCODE_UNKNOWN,
+    /* 155 */   SDL_SCANCODE_UNKNOWN,
+    /* 156 */   SDL_SCANCODE_UNKNOWN,
+    /* 157 */   SDL_SCANCODE_UNKNOWN,
+    /* 158 */   SDL_SCANCODE_UNKNOWN,
+    /* 159 */   SDL_SCANCODE_UNKNOWN,
+    /* 160 */   SDL_SCANCODE_UNKNOWN,
+    /* 161 */   SDL_SCANCODE_UNKNOWN,
+    /* 162 */   SDL_SCANCODE_UNKNOWN,
+    /* 163 */   SDL_SCANCODE_UNKNOWN,
+    /* 164 */   SDL_SCANCODE_UNKNOWN,
+    /* 165 */   SDL_SCANCODE_UNKNOWN,
+    /* 166 */   SDL_SCANCODE_UNKNOWN,
+    /* 167 */   SDL_SCANCODE_UNKNOWN,
+    /* 168 */   SDL_SCANCODE_UNKNOWN,
+    /* 169 */   SDL_SCANCODE_UNKNOWN,
+    /* 170 */   SDL_SCANCODE_UNKNOWN,
+    /* 171 */   SDL_SCANCODE_UNKNOWN,
+    /* 172 */   SDL_SCANCODE_UNKNOWN,
+    /* 173 */   SDL_SCANCODE_MINUS, /*FX*/
+    /* 174 */   SDL_SCANCODE_VOLUMEDOWN, /*IE, Chrome*/
+    /* 175 */   SDL_SCANCODE_VOLUMEUP, /*IE, Chrome*/
+    /* 176 */   SDL_SCANCODE_AUDIONEXT, /*IE, Chrome*/
+    /* 177 */   SDL_SCANCODE_AUDIOPREV, /*IE, Chrome*/
+    /* 178 */   SDL_SCANCODE_UNKNOWN,
+    /* 179 */   SDL_SCANCODE_AUDIOPLAY, /*IE, Chrome*/
+    /* 180 */   SDL_SCANCODE_UNKNOWN,
+    /* 181 */   SDL_SCANCODE_AUDIOMUTE, /*FX*/
+    /* 182 */   SDL_SCANCODE_VOLUMEDOWN, /*FX*/
+    /* 183 */   SDL_SCANCODE_VOLUMEUP, /*FX*/
+    /* 184 */   SDL_SCANCODE_UNKNOWN,
+    /* 185 */   SDL_SCANCODE_UNKNOWN,
+    /* 186 */   SDL_SCANCODE_SEMICOLON, /*IE, Chrome, D3E legacy*/
+    /* 187 */   SDL_SCANCODE_EQUALS, /*IE, Chrome, D3E legacy*/
+    /* 188 */   SDL_SCANCODE_COMMA,
+    /* 189 */   SDL_SCANCODE_MINUS, /*IE, Chrome, D3E legacy*/
+    /* 190 */   SDL_SCANCODE_PERIOD,
+    /* 191 */   SDL_SCANCODE_SLASH,
+    /* 192 */   SDL_SCANCODE_GRAVE, /*FX, D3E legacy (SDL_SCANCODE_APOSTROPHE in IE/Chrome)*/
+    /* 193 */   SDL_SCANCODE_UNKNOWN,
+    /* 194 */   SDL_SCANCODE_UNKNOWN,
+    /* 195 */   SDL_SCANCODE_UNKNOWN,
+    /* 196 */   SDL_SCANCODE_UNKNOWN,
+    /* 197 */   SDL_SCANCODE_UNKNOWN,
+    /* 198 */   SDL_SCANCODE_UNKNOWN,
+    /* 199 */   SDL_SCANCODE_UNKNOWN,
+    /* 200 */   SDL_SCANCODE_UNKNOWN,
+    /* 201 */   SDL_SCANCODE_UNKNOWN,
+    /* 202 */   SDL_SCANCODE_UNKNOWN,
+    /* 203 */   SDL_SCANCODE_UNKNOWN,
+    /* 204 */   SDL_SCANCODE_UNKNOWN,
+    /* 205 */   SDL_SCANCODE_UNKNOWN,
+    /* 206 */   SDL_SCANCODE_UNKNOWN,
+    /* 207 */   SDL_SCANCODE_UNKNOWN,
+    /* 208 */   SDL_SCANCODE_UNKNOWN,
+    /* 209 */   SDL_SCANCODE_UNKNOWN,
+    /* 210 */   SDL_SCANCODE_UNKNOWN,
+    /* 211 */   SDL_SCANCODE_UNKNOWN,
+    /* 212 */   SDL_SCANCODE_UNKNOWN,
+    /* 213 */   SDL_SCANCODE_UNKNOWN,
+    /* 214 */   SDL_SCANCODE_UNKNOWN,
+    /* 215 */   SDL_SCANCODE_UNKNOWN,
+    /* 216 */   SDL_SCANCODE_UNKNOWN,
+    /* 217 */   SDL_SCANCODE_UNKNOWN,
+    /* 218 */   SDL_SCANCODE_UNKNOWN,
+    /* 219 */   SDL_SCANCODE_LEFTBRACKET,
+    /* 220 */   SDL_SCANCODE_BACKSLASH,
+    /* 221 */   SDL_SCANCODE_RIGHTBRACKET,
+    /* 222 */   SDL_SCANCODE_APOSTROPHE, /*FX, D3E legacy*/
+};
+
+
+/* "borrowed" from SDL_windowsevents.c */
+static int
+Emscripten_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 EM_BOOL
+Emscripten_HandlePointerLockChange(int eventType, const EmscriptenPointerlockChangeEvent *changeEvent, void *userData)
+{
+    SDL_WindowData *window_data = (SDL_WindowData *) userData;
+    /* keep track of lock losses, so we can regrab if/when appropriate. */
+    window_data->has_pointer_lock = changeEvent->isActive;
+    return 0;
+}
+
+
+static EM_BOOL
+Emscripten_HandleMouseMove(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData)
+{
+    SDL_WindowData *window_data = userData;
+    const int isPointerLocked = window_data->has_pointer_lock;
+    int mx, my;
+    static double residualx = 0, residualy = 0;
+
+    /* rescale (in case canvas is being scaled)*/
+    double client_w, client_h, xscale, yscale;
+    emscripten_get_element_css_size(NULL, &client_w, &client_h);
+    xscale = window_data->window->w / client_w;
+    yscale = window_data->window->h / client_h;
+
+    if (isPointerLocked) {
+        residualx += mouseEvent->movementX * xscale;
+        residualy += mouseEvent->movementY * yscale;
+        /* Let slow sub-pixel motion accumulate. Don't lose it. */
+        mx = residualx;
+        residualx -= mx;
+        my = residualy;
+        residualy -= my;
+    } else {
+        mx = mouseEvent->canvasX * xscale;
+        my = mouseEvent->canvasY * yscale;
+    }
+
+    SDL_SendMouseMotion(window_data->window, 0, isPointerLocked, mx, my);
+    return 0;
+}
+
+static EM_BOOL
+Emscripten_HandleMouseButton(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData)
+{
+    SDL_WindowData *window_data = userData;
+    Uint8 sdl_button;
+    Uint8 sdl_button_state;
+    SDL_EventType sdl_event_type;
+
+    switch (mouseEvent->button) {
+        case 0:
+            sdl_button = SDL_BUTTON_LEFT;
+            break;
+        case 1:
+            sdl_button = SDL_BUTTON_MIDDLE;
+            break;
+        case 2:
+            sdl_button = SDL_BUTTON_RIGHT;
+            break;
+        default:
+            return 0;
+    }
+
+    if (eventType == EMSCRIPTEN_EVENT_MOUSEDOWN) {
+        if (SDL_GetMouse()->relative_mode && !window_data->has_pointer_lock) {
+            emscripten_request_pointerlock(NULL, 0);  /* try to regrab lost pointer lock. */
+        }
+        sdl_button_state = SDL_PRESSED;
+        sdl_event_type = SDL_MOUSEBUTTONDOWN;
+    } else {
+        sdl_button_state = SDL_RELEASED;
+        sdl_event_type = SDL_MOUSEBUTTONUP;
+    }
+    SDL_SendMouseButton(window_data->window, 0, sdl_button_state, sdl_button);
+    return SDL_GetEventState(sdl_event_type) == SDL_ENABLE;
+}
+
+static EM_BOOL
+Emscripten_HandleMouseFocus(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData)
+{
+    SDL_WindowData *window_data = userData;
+
+    int mx = mouseEvent->canvasX, my = mouseEvent->canvasY;
+    const int isPointerLocked = window_data->has_pointer_lock;
+
+    if (!isPointerLocked) {
+        /* rescale (in case canvas is being scaled)*/
+        double client_w, client_h;
+        emscripten_get_element_css_size(NULL, &client_w, &client_h);
+
+        mx = mx * (window_data->window->w / client_w);
+        my = my * (window_data->window->h / client_h);
+        SDL_SendMouseMotion(window_data->window, 0, isPointerLocked, mx, my);
+    }
+
+    SDL_SetMouseFocus(eventType == EMSCRIPTEN_EVENT_MOUSEENTER ? window_data->window : NULL);
+    return SDL_GetEventState(SDL_WINDOWEVENT) == SDL_ENABLE;
+}
+
+static EM_BOOL
+Emscripten_HandleWheel(int eventType, const EmscriptenWheelEvent *wheelEvent, void *userData)
+{
+    SDL_WindowData *window_data = userData;
+    SDL_SendMouseWheel(window_data->window, 0, (float)wheelEvent->deltaX, (float)-wheelEvent->deltaY, SDL_MOUSEWHEEL_NORMAL);
+    return SDL_GetEventState(SDL_MOUSEWHEEL) == SDL_ENABLE;
+}
+
+static EM_BOOL
+Emscripten_HandleFocus(int eventType, const EmscriptenFocusEvent *wheelEvent, void *userData)
+{
+    SDL_WindowData *window_data = userData;
+    /* If the user switches away while keys are pressed (such as
+     * via Alt+Tab), key release events won't be received. */
+    if (eventType == EMSCRIPTEN_EVENT_BLUR) {
+        SDL_ResetKeyboard();
+    }
+
+
+    SDL_SendWindowEvent(window_data->window, eventType == EMSCRIPTEN_EVENT_FOCUS ? SDL_WINDOWEVENT_FOCUS_GAINED : SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
+    return SDL_GetEventState(SDL_WINDOWEVENT) == SDL_ENABLE;
+}
+
+static EM_BOOL
+Emscripten_HandleTouch(int eventType, const EmscriptenTouchEvent *touchEvent, void *userData)
+{
+    SDL_WindowData *window_data = userData;
+    int i;
+    double client_w, client_h;
+    int preventDefault = 0;
+
+    SDL_TouchID deviceId = 1;
+    if (SDL_AddTouch(deviceId, "") < 0) {
+         return 0;
+    }
+
+    emscripten_get_element_css_size(NULL, &client_w, &client_h);
+
+    for (i = 0; i < touchEvent->numTouches; i++) {
+        SDL_FingerID id;
+        float x, y;
+        int mx, my;
+
+        if (!touchEvent->touches[i].isChanged)
+            continue;
+
+        id = touchEvent->touches[i].identifier;
+        x = touchEvent->touches[i].canvasX / client_w;
+        y = touchEvent->touches[i].canvasY / client_h;
+
+        mx = x * window_data->window->w;
+        my = y * window_data->window->h;
+
+        if (eventType == EMSCRIPTEN_EVENT_TOUCHSTART) {
+            if (!window_data->finger_touching) {
+                window_data->finger_touching = SDL_TRUE;
+                window_data->first_finger = id;
+                SDL_SendMouseMotion(window_data->window, SDL_TOUCH_MOUSEID, 0, mx, my);
+                SDL_SendMouseButton(window_data->window, SDL_TOUCH_MOUSEID, SDL_PRESSED, SDL_BUTTON_LEFT);
+            }
+            SDL_SendTouch(deviceId, id, SDL_TRUE, x, y, 1.0f);
+
+            if (!preventDefault && SDL_GetEventState(SDL_FINGERDOWN) == SDL_ENABLE) {
+                preventDefault = 1;
+            }
+        } else if (eventType == EMSCRIPTEN_EVENT_TOUCHMOVE) {
+            if ((window_data->finger_touching) && (window_data->first_finger == id)) {
+                SDL_SendMouseMotion(window_data->window, SDL_TOUCH_MOUSEID, 0, mx, my);
+            }
+            SDL_SendTouchMotion(deviceId, id, x, y, 1.0f);
+
+            if (!preventDefault && SDL_GetEventState(SDL_FINGERMOTION) == SDL_ENABLE) {
+                preventDefault = 1;
+            }
+        } else {
+            if ((window_data->finger_touching) && (window_data->first_finger == id)) {
+                SDL_SendMouseButton(window_data->window, SDL_TOUCH_MOUSEID, SDL_RELEASED, SDL_BUTTON_LEFT);
+                window_data->finger_touching = SDL_FALSE;
+            }
+            SDL_SendTouch(deviceId, id, SDL_FALSE, x, y, 1.0f);
+
+            if (!preventDefault && SDL_GetEventState(SDL_FINGERUP) == SDL_ENABLE) {
+                preventDefault = 1;
+            }
+        }
+    }
+
+    return preventDefault;
+}
+
+static EM_BOOL
+Emscripten_HandleKey(int eventType, const EmscriptenKeyboardEvent *keyEvent, void *userData)
+{
+    Uint32 scancode;
+    SDL_bool prevent_default;
+    SDL_bool is_nav_key;
+
+    /* .keyCode is deprecated, but still the most reliable way to get keys */
+    if (keyEvent->keyCode < SDL_arraysize(emscripten_scancode_table)) {
+        scancode = emscripten_scancode_table[keyEvent->keyCode];
+
+        if (scancode != SDL_SCANCODE_UNKNOWN) {
+
+            if (keyEvent->location == DOM_KEY_LOCATION_RIGHT) {
+                switch (scancode) {
+                    case SDL_SCANCODE_LSHIFT:
+                        scancode = SDL_SCANCODE_RSHIFT;
+                        break;
+                    case SDL_SCANCODE_LCTRL:
+                        scancode = SDL_SCANCODE_RCTRL;
+                        break;
+                    case SDL_SCANCODE_LALT:
+                        scancode = SDL_SCANCODE_RALT;
+                        break;
+                    case SDL_SCANCODE_LGUI:
+                        scancode = SDL_SCANCODE_RGUI;
+                        break;
+                }
+            }
+            SDL_SendKeyboardKey(eventType == EMSCRIPTEN_EVENT_KEYDOWN ? SDL_PRESSED : SDL_RELEASED, scancode);
+        }
+    }
+
+    prevent_default = SDL_GetEventState(eventType == EMSCRIPTEN_EVENT_KEYDOWN ? SDL_KEYDOWN : SDL_KEYUP) == SDL_ENABLE;
+
+    /* if TEXTINPUT events are enabled we can't prevent keydown or we won't get keypress
+     * we need to ALWAYS prevent backspace and tab otherwise chrome takes action and does bad navigation UX
+     */
+    is_nav_key = keyEvent->keyCode == 8 /* backspace */ ||
+                 keyEvent->keyCode == 9 /* tab */ ||
+                 keyEvent->keyCode == 37 /* left */ ||
+                 keyEvent->keyCode == 38 /* up */ ||
+                 keyEvent->keyCode == 39 /* right */ ||
+                 keyEvent->keyCode == 40 /* down */;
+
+    if (eventType == EMSCRIPTEN_EVENT_KEYDOWN && SDL_GetEventState(SDL_TEXTINPUT) == SDL_ENABLE && !is_nav_key)
+        prevent_default = SDL_FALSE;
+
+    return prevent_default;
+}
+
+static EM_BOOL
+Emscripten_HandleKeyPress(int eventType, const EmscriptenKeyboardEvent *keyEvent, void *userData)
+{
+    char text[5];
+    if (Emscripten_ConvertUTF32toUTF8(keyEvent->charCode, text)) {
+        SDL_SendKeyboardText(text);
+    }
+    return SDL_GetEventState(SDL_TEXTINPUT) == SDL_ENABLE;
+}
+
+static EM_BOOL
+Emscripten_HandleFullscreenChange(int eventType, const EmscriptenFullscreenChangeEvent *fullscreenChangeEvent, void *userData)
+{
+    SDL_WindowData *window_data = userData;
+    if(fullscreenChangeEvent->isFullscreen)
+    {
+        window_data->window->flags |= window_data->requested_fullscreen_mode;
+
+        window_data->requested_fullscreen_mode = 0;
+
+        if(!window_data->requested_fullscreen_mode)
+            window_data->window->flags |= SDL_WINDOW_FULLSCREEN; /*we didn't reqest fullscreen*/
+    }
+    else
+    {
+        window_data->window->flags &= ~FULLSCREEN_MASK;
+    }
+
+    return 0;
+}
+
+static EM_BOOL
+Emscripten_HandleResize(int eventType, const EmscriptenUiEvent *uiEvent, void *userData)
+{
+    SDL_WindowData *window_data = userData;
+
+    /* update pixel ratio */
+    if (window_data->window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
+        window_data->pixel_ratio = emscripten_get_device_pixel_ratio();
+    }
+
+    if(!(window_data->window->flags & FULLSCREEN_MASK))
+    {
+        /* this will only work if the canvas size is set through css */
+        if(window_data->window->flags & SDL_WINDOW_RESIZABLE)
+        {
+            double w = window_data->window->w;
+            double h = window_data->window->h;
+
+            if(window_data->external_size) {
+                emscripten_get_element_css_size(NULL, &w, &h);
+            }
+
+            emscripten_set_canvas_size(w * window_data->pixel_ratio, h * window_data->pixel_ratio);
+
+            /* set_canvas_size unsets this */
+            if (!window_data->external_size && window_data->pixel_ratio != 1.0f) {
+                emscripten_set_element_css_size(NULL, w, h);
+            }
+
+            SDL_SendWindowEvent(window_data->window, SDL_WINDOWEVENT_RESIZED, w, h);
+        }
+    }
+
+    return 0;
+}
+
+EM_BOOL
+Emscripten_HandleCanvasResize(int eventType, const void *reserved, void *userData)
+{
+    /*this is used during fullscreen changes*/
+    SDL_WindowData *window_data = userData;
+
+    if(window_data->fullscreen_resize)
+    {
+        double css_w, css_h;
+        emscripten_get_element_css_size(NULL, &css_w, &css_h);
+        SDL_SendWindowEvent(window_data->window, SDL_WINDOWEVENT_RESIZED, css_w, css_h);
+    }
+
+    return 0;
+}
+
+static EM_BOOL
+Emscripten_HandleVisibilityChange(int eventType, const EmscriptenVisibilityChangeEvent *visEvent, void *userData)
+{
+    SDL_WindowData *window_data = userData;
+    SDL_SendWindowEvent(window_data->window, visEvent->hidden ? SDL_WINDOWEVENT_HIDDEN : SDL_WINDOWEVENT_SHOWN, 0, 0);
+    return 0;
+}
+
+void
+Emscripten_RegisterEventHandlers(SDL_WindowData *data)
+{
+    const char *keyElement;
+
+    /* There is only one window and that window is the canvas */
+    emscripten_set_mousemove_callback("#canvas", data, 0, Emscripten_HandleMouseMove);
+
+    emscripten_set_mousedown_callback("#canvas", data, 0, Emscripten_HandleMouseButton);
+    emscripten_set_mouseup_callback("#document", data, 0, Emscripten_HandleMouseButton);
+
+    emscripten_set_mouseenter_callback("#canvas", data, 0, Emscripten_HandleMouseFocus);
+    emscripten_set_mouseleave_callback("#canvas", data, 0, Emscripten_HandleMouseFocus);
+
+    emscripten_set_wheel_callback("#canvas", data, 0, Emscripten_HandleWheel);
+
+    emscripten_set_focus_callback("#window", data, 0, Emscripten_HandleFocus);
+    emscripten_set_blur_callback("#window", data, 0, Emscripten_HandleFocus);
+
+    emscripten_set_touchstart_callback("#canvas", data, 0, Emscripten_HandleTouch);
+    emscripten_set_touchend_callback("#canvas", data, 0, Emscripten_HandleTouch);
+    emscripten_set_touchmove_callback("#canvas", data, 0, Emscripten_HandleTouch);
+    emscripten_set_touchcancel_callback("#canvas", data, 0, Emscripten_HandleTouch);
+
+    emscripten_set_pointerlockchange_callback("#document", data, 0, Emscripten_HandlePointerLockChange);
+
+    /* Keyboard events are awkward */
+    keyElement = SDL_GetHint(SDL_HINT_EMSCRIPTEN_KEYBOARD_ELEMENT);
+    if (!keyElement) keyElement = "#window";
+
+    emscripten_set_keydown_callback(keyElement, data, 0, Emscripten_HandleKey);
+    emscripten_set_keyup_callback(keyElement, data, 0, Emscripten_HandleKey);
+    emscripten_set_keypress_callback(keyElement, data, 0, Emscripten_HandleKeyPress);
+
+    emscripten_set_fullscreenchange_callback("#document", data, 0, Emscripten_HandleFullscreenChange);
+
+    emscripten_set_resize_callback("#window", data, 0, Emscripten_HandleResize);
+
+    emscripten_set_visibilitychange_callback(data, 0, Emscripten_HandleVisibilityChange);
+}
+
+void
+Emscripten_UnregisterEventHandlers(SDL_WindowData *data)
+{
+    const char *target;
+
+    /* only works due to having one window */
+    emscripten_set_mousemove_callback("#canvas", NULL, 0, NULL);
+
+    emscripten_set_mousedown_callback("#canvas", NULL, 0, NULL);
+    emscripten_set_mouseup_callback("#document", NULL, 0, NULL);
+
+    emscripten_set_mouseenter_callback("#canvas", NULL, 0, NULL);
+    emscripten_set_mouseleave_callback("#canvas", NULL, 0, NULL);
+
+    emscripten_set_wheel_callback("#canvas", NULL, 0, NULL);
+
+    emscripten_set_focus_callback("#window", NULL, 0, NULL);
+    emscripten_set_blur_callback("#window", NULL, 0, NULL);
+
+    emscripten_set_touchstart_callback("#canvas", NULL, 0, NULL);
+    emscripten_set_touchend_callback("#canvas", NULL, 0, NULL);
+    emscripten_set_touchmove_callback("#canvas", NULL, 0, NULL);
+    emscripten_set_touchcancel_callback("#canvas", NULL, 0, NULL);
+
+    emscripten_set_pointerlockchange_callback("#document", NULL, 0, NULL);
+
+    target = SDL_GetHint(SDL_HINT_EMSCRIPTEN_KEYBOARD_ELEMENT);
+    if (!target) {
+        target = "#window";
+    }
+
+    emscripten_set_keydown_callback(target, NULL, 0, NULL);
+    emscripten_set_keyup_callback(target, NULL, 0, NULL);
+    emscripten_set_keypress_callback(target, NULL, 0, NULL);
+
+    emscripten_set_fullscreenchange_callback("#document", NULL, 0, NULL);
+
+    emscripten_set_resize_callback("#window", NULL, 0, NULL);
+
+    emscripten_set_visibilitychange_callback(NULL, 0, NULL);
+}
+
+#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenevents.h b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenevents.h
new file mode 100644
index 0000000..3a4e058
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenevents.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.
+*/
+
+
+#ifndef SDL_emscriptenevents_h_
+#define SDL_emscriptenevents_h_
+
+#include "SDL_emscriptenvideo.h"
+
+extern void
+Emscripten_RegisterEventHandlers(SDL_WindowData *data);
+
+extern void
+Emscripten_UnregisterEventHandlers(SDL_WindowData *data);
+
+extern EM_BOOL
+Emscripten_HandleCanvasResize(int eventType, const void *reserved, void *userData);
+
+#endif /* SDL_emscriptenevents_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
+
diff --git a/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.c b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.c
new file mode 100644
index 0000000..bfdec3b
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.c
@@ -0,0 +1,178 @@
+/*
+  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_EMSCRIPTEN
+
+#include "SDL_emscriptenvideo.h"
+#include "SDL_emscriptenframebuffer.h"
+
+
+int Emscripten_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
+{
+    SDL_Surface *surface;
+    const Uint32 surface_format = SDL_PIXELFORMAT_BGR888;
+    int w, h;
+    int bpp;
+    Uint32 Rmask, Gmask, Bmask, Amask;
+
+    /* Free the old framebuffer surface */
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+    surface = data->surface;
+    SDL_FreeSurface(surface);
+
+    /* Create a new one */
+    SDL_PixelFormatEnumToMasks(surface_format, &bpp, &Rmask, &Gmask, &Bmask, &Amask);
+    SDL_GetWindowSize(window, &w, &h);
+
+    surface = SDL_CreateRGBSurface(0, w, h, bpp, Rmask, Gmask, Bmask, Amask);
+    if (!surface) {
+        return -1;
+    }
+
+    /* Save the info and return! */
+    data->surface = surface;
+    *format = surface_format;
+    *pixels = surface->pixels;
+    *pitch = surface->pitch;
+    return 0;
+}
+
+int Emscripten_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rect * rects, int numrects)
+{
+    SDL_Surface *surface;
+
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+    surface = data->surface;
+    if (!surface) {
+        return SDL_SetError("Couldn't find framebuffer surface for window");
+    }
+
+    /* Send the data to the display */
+
+    EM_ASM_INT({
+        var w = $0;
+        var h = $1;
+        var pixels = $2;
+
+        if (!Module['SDL2']) Module['SDL2'] = {};
+        var SDL2 = Module['SDL2'];
+        if (SDL2.ctxCanvas !== Module['canvas']) {
+            SDL2.ctx = Module['createContext'](Module['canvas'], false, true);
+            SDL2.ctxCanvas = Module['canvas'];
+        }
+        if (SDL2.w !== w || SDL2.h !== h || SDL2.imageCtx !== SDL2.ctx) {
+            SDL2.image = SDL2.ctx.createImageData(w, h);
+            SDL2.w = w;
+            SDL2.h = h;
+            SDL2.imageCtx = SDL2.ctx;
+        }
+        var data = SDL2.image.data;
+        var src = pixels >> 2;
+        var dst = 0;
+        var num;
+        if (typeof CanvasPixelArray !== 'undefined' && data instanceof CanvasPixelArray) {
+            // IE10/IE11: ImageData objects are backed by the deprecated CanvasPixelArray,
+            // not UInt8ClampedArray. These don't have buffers, so we need to revert
+            // to copying a byte at a time. We do the undefined check because modern
+            // browsers do not define CanvasPixelArray anymore.
+            num = data.length;
+            while (dst < num) {
+                var val = HEAP32[src]; // This is optimized. Instead, we could do {{{ makeGetValue('buffer', 'dst', 'i32') }}};
+                data[dst  ] = val & 0xff;
+                data[dst+1] = (val >> 8) & 0xff;
+                data[dst+2] = (val >> 16) & 0xff;
+                data[dst+3] = 0xff;
+                src++;
+                dst += 4;
+            }
+        } else {
+            if (SDL2.data32Data !== data) {
+                SDL2.data32 = new Int32Array(data.buffer);
+                SDL2.data8 = new Uint8Array(data.buffer);
+            }
+            var data32 = SDL2.data32;
+            num = data32.length;
+            // logically we need to do
+            //      while (dst < num) {
+            //          data32[dst++] = HEAP32[src++] | 0xff000000
+            //      }
+            // the following code is faster though, because
+            // .set() is almost free - easily 10x faster due to
+            // native memcpy efficiencies, and the remaining loop
+            // just stores, not load + store, so it is faster
+            data32.set(HEAP32.subarray(src, src + num));
+            var data8 = SDL2.data8;
+            var i = 3;
+            var j = i + 4*num;
+            if (num % 8 == 0) {
+                // unrolling gives big speedups
+                while (i < j) {
+                  data8[i] = 0xff;
+                  i = i + 4 | 0;
+                  data8[i] = 0xff;
+                  i = i + 4 | 0;
+                  data8[i] = 0xff;
+                  i = i + 4 | 0;
+                  data8[i] = 0xff;
+                  i = i + 4 | 0;
+                  data8[i] = 0xff;
+                  i = i + 4 | 0;
+                  data8[i] = 0xff;
+                  i = i + 4 | 0;
+                  data8[i] = 0xff;
+                  i = i + 4 | 0;
+                  data8[i] = 0xff;
+                  i = i + 4 | 0;
+                }
+             } else {
+                while (i < j) {
+                  data8[i] = 0xff;
+                  i = i + 4 | 0;
+                }
+            }
+        }
+
+        SDL2.ctx.putImageData(SDL2.image, 0, 0);
+        return 0;
+    }, surface->w, surface->h, surface->pixels);
+
+    /*if (SDL_getenv("SDL_VIDEO_Emscripten_SAVE_FRAMES")) {
+        static int frame_number = 0;
+        char file[128];
+        SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp",
+                     SDL_GetWindowID(window), ++frame_number);
+        SDL_SaveBMP(surface, file);
+    }*/
+    return 0;
+}
+
+void Emscripten_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
+{
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+
+    SDL_FreeSurface(data->surface);
+    data->surface = NULL;
+}
+
+#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.h b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.h
new file mode 100644
index 0000000..49a215a
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenframebuffer.h
@@ -0,0 +1,32 @@
+/*
+  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_emscriptenframebuffer_h_
+#define SDL_emscriptenframebuffer_h_
+
+extern int Emscripten_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch);
+extern int Emscripten_UpdateWindowFramebuffer(_THIS, SDL_Window * window, const SDL_Rect * rects, int numrects);
+extern void Emscripten_DestroyWindowFramebuffer(_THIS, SDL_Window * window);
+
+#endif /* SDL_emscriptenframebuffer_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenmouse.c b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenmouse.c
new file mode 100644
index 0000000..e120980
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenmouse.c
@@ -0,0 +1,275 @@
+/*
+  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_EMSCRIPTEN
+
+#include <emscripten/emscripten.h>
+#include <emscripten/html5.h>
+
+#include "SDL_emscriptenmouse.h"
+
+#include "../../events/SDL_mouse_c.h"
+#include "SDL_assert.h"
+
+static SDL_Cursor*
+Emscripten_CreateCursorFromString(const char* cursor_str, SDL_bool is_custom)
+{
+    SDL_Cursor* cursor;
+    Emscripten_CursorData *curdata;
+
+    cursor = SDL_calloc(1, sizeof(SDL_Cursor));
+    if (cursor) {
+        curdata = (Emscripten_CursorData *) SDL_calloc(1, sizeof(*curdata));
+        if (!curdata) {
+            SDL_OutOfMemory();
+            SDL_free(cursor);
+            return NULL;
+        }
+
+        curdata->system_cursor = cursor_str;
+        curdata->is_custom = is_custom;
+        cursor->driverdata = curdata;
+    }
+    else {
+        SDL_OutOfMemory();
+    }
+
+    return cursor;
+}
+
+static SDL_Cursor*
+Emscripten_CreateDefaultCursor()
+{
+    return Emscripten_CreateCursorFromString("default", SDL_FALSE);
+}
+
+static SDL_Cursor*
+Emscripten_CreateCursor(SDL_Surface* surface, int hot_x, int hot_y)
+{
+    const char *cursor_url = NULL;
+    SDL_Surface *conv_surf;
+
+    conv_surf = SDL_ConvertSurfaceFormat(surface, SDL_PIXELFORMAT_ABGR8888, 0);
+
+    if (!conv_surf) {
+        return NULL;
+    }
+
+    cursor_url = (const char *)EM_ASM_INT({
+        var w = $0;
+        var h = $1;
+        var hot_x = $2;
+        var hot_y = $3;
+        var pixels = $4;
+
+        var canvas = document.createElement("canvas");
+        canvas.width = w;
+        canvas.height = h;
+
+        var ctx = canvas.getContext("2d");
+
+        var image = ctx.createImageData(w, h);
+        var data = image.data;
+        var src = pixels >> 2;
+        var dst = 0;
+        var num;
+        if (typeof CanvasPixelArray !== 'undefined' && data instanceof CanvasPixelArray) {
+            // IE10/IE11: ImageData objects are backed by the deprecated CanvasPixelArray,
+            // not UInt8ClampedArray. These don't have buffers, so we need to revert
+            // to copying a byte at a time. We do the undefined check because modern
+            // browsers do not define CanvasPixelArray anymore.
+            num = data.length;
+            while (dst < num) {
+                var val = HEAP32[src]; // This is optimized. Instead, we could do {{{ makeGetValue('buffer', 'dst', 'i32') }}};
+                data[dst  ] = val & 0xff;
+                data[dst+1] = (val >> 8) & 0xff;
+                data[dst+2] = (val >> 16) & 0xff;
+                data[dst+3] = (val >> 24) & 0xff;
+                src++;
+                dst += 4;
+            }
+        } else {
+            var data32 = new Int32Array(data.buffer);
+            num = data32.length;
+            data32.set(HEAP32.subarray(src, src + num));
+        }
+
+        ctx.putImageData(image, 0, 0);
+        var url = hot_x === 0 && hot_y === 0
+            ? "url(" + canvas.toDataURL() + "), auto"
+            : "url(" + canvas.toDataURL() + ") " + hot_x + " " + hot_y + ", auto";
+
+        var urlBuf = _malloc(url.length + 1);
+        stringToUTF8(url, urlBuf, url.length + 1);
+
+        return urlBuf;
+    }, surface->w, surface->h, hot_x, hot_y, conv_surf->pixels);
+
+    SDL_FreeSurface(conv_surf);
+
+    return Emscripten_CreateCursorFromString(cursor_url, SDL_TRUE);
+}
+
+static SDL_Cursor*
+Emscripten_CreateSystemCursor(SDL_SystemCursor id)
+{
+    const char *cursor_name = NULL;
+
+    switch(id) {
+        case SDL_SYSTEM_CURSOR_ARROW:
+            cursor_name = "default";
+            break;
+        case SDL_SYSTEM_CURSOR_IBEAM:
+            cursor_name = "text";
+            break;
+        case SDL_SYSTEM_CURSOR_WAIT:
+            cursor_name = "wait";
+            break;
+        case SDL_SYSTEM_CURSOR_CROSSHAIR:
+            cursor_name = "crosshair";
+            break;
+        case SDL_SYSTEM_CURSOR_WAITARROW:
+            cursor_name = "progress";
+            break;
+        case SDL_SYSTEM_CURSOR_SIZENWSE:
+            cursor_name = "nwse-resize";
+            break;
+        case SDL_SYSTEM_CURSOR_SIZENESW:
+            cursor_name = "nesw-resize";
+            break;
+        case SDL_SYSTEM_CURSOR_SIZEWE:
+            cursor_name = "ew-resize";
+            break;
+        case SDL_SYSTEM_CURSOR_SIZENS:
+            cursor_name = "ns-resize";
+            break;
+        case SDL_SYSTEM_CURSOR_SIZEALL:
+            cursor_name = "move";
+            break;
+        case SDL_SYSTEM_CURSOR_NO:
+            cursor_name = "not-allowed";
+            break;
+        case SDL_SYSTEM_CURSOR_HAND:
+            cursor_name = "pointer";
+            break;
+        default:
+            SDL_assert(0);
+            return NULL;
+    }
+
+    return Emscripten_CreateCursorFromString(cursor_name, SDL_FALSE);
+}
+
+static void
+Emscripten_FreeCursor(SDL_Cursor* cursor)
+{
+    Emscripten_CursorData *curdata;
+    if (cursor) {
+        curdata = (Emscripten_CursorData *) cursor->driverdata;
+
+        if (curdata != NULL) {
+            if (curdata->is_custom) {
+                SDL_free((char *)curdata->system_cursor);
+            }
+            SDL_free(cursor->driverdata);
+        }
+
+        SDL_free(cursor);
+    }
+}
+
+static int
+Emscripten_ShowCursor(SDL_Cursor* cursor)
+{
+    Emscripten_CursorData *curdata;
+    if (SDL_GetMouseFocus() != NULL) {
+        if(cursor && cursor->driverdata) {
+            curdata = (Emscripten_CursorData *) cursor->driverdata;
+
+            if(curdata->system_cursor) {
+                EM_ASM_INT({
+                    if (Module['canvas']) {
+                        Module['canvas'].style['cursor'] = Module['Pointer_stringify']($0);
+                    }
+                    return 0;
+                }, curdata->system_cursor);
+            }
+        }
+        else {
+            EM_ASM(
+                if (Module['canvas']) {
+                    Module['canvas'].style['cursor'] = 'none';
+                }
+            );
+        }
+    }
+    return 0;
+}
+
+static void
+Emscripten_WarpMouse(SDL_Window* window, int x, int y)
+{
+    SDL_Unsupported();
+}
+
+static int
+Emscripten_SetRelativeMouseMode(SDL_bool enabled)
+{
+    /* TODO: pointer lock isn't actually enabled yet */
+    if(enabled) {
+        if(emscripten_request_pointerlock(NULL, 1) >= EMSCRIPTEN_RESULT_SUCCESS) {
+            return 0;
+        }
+    } else {
+        if(emscripten_exit_pointerlock() >= EMSCRIPTEN_RESULT_SUCCESS) {
+            return 0;
+        }
+    }
+    return -1;
+}
+
+void
+Emscripten_InitMouse()
+{
+    SDL_Mouse* mouse = SDL_GetMouse();
+
+    mouse->CreateCursor         = Emscripten_CreateCursor;
+    mouse->ShowCursor           = Emscripten_ShowCursor;
+    mouse->FreeCursor           = Emscripten_FreeCursor;
+    mouse->WarpMouse            = Emscripten_WarpMouse;
+    mouse->CreateSystemCursor   = Emscripten_CreateSystemCursor;
+    mouse->SetRelativeMouseMode = Emscripten_SetRelativeMouseMode;
+
+    SDL_SetDefaultCursor(Emscripten_CreateDefaultCursor());
+}
+
+void
+Emscripten_FiniMouse()
+{
+}
+
+#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
+
+/* vi: set ts=4 sw=4 expandtab: */
+
diff --git a/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenmouse.h b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenmouse.h
new file mode 100644
index 0000000..d6cd492
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenmouse.h
@@ -0,0 +1,42 @@
+/*
+  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_emscriptenmouse_h_
+#define SDL_emscriptenmouse_h_
+
+#include "SDL_stdinc.h"
+
+typedef struct _Emscripten_CursorData
+{
+    const char *system_cursor;
+    SDL_bool is_custom;
+} Emscripten_CursorData;
+
+extern void
+Emscripten_InitMouse();
+
+extern void
+Emscripten_FiniMouse();
+
+#endif /* SDL_emscriptenmouse_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenopengles.c b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenopengles.c
new file mode 100644
index 0000000..7d8c005
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenopengles.c
@@ -0,0 +1,121 @@
+/*
+  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_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL
+
+#include <emscripten/emscripten.h>
+#include <GLES2/gl2.h>
+
+#include "SDL_emscriptenvideo.h"
+#include "SDL_emscriptenopengles.h"
+
+#define LOAD_FUNC(NAME) _this->egl_data->NAME = NAME;
+
+/* EGL implementation of SDL OpenGL support */
+
+int
+Emscripten_GLES_LoadLibrary(_THIS, const char *path) {
+    /*we can't load EGL dynamically*/
+    _this->egl_data = (struct SDL_EGL_VideoData *) SDL_calloc(1, sizeof(SDL_EGL_VideoData));
+    if (!_this->egl_data) {
+        return SDL_OutOfMemory();
+    }
+
+    /* Emscripten forces you to manually cast eglGetProcAddress to the real
+       function type; grep for "__eglMustCastToProperFunctionPointerType" in
+       Emscripten's egl.h for details. */
+    _this->egl_data->eglGetProcAddress = (void *(EGLAPIENTRY *)(const char *)) eglGetProcAddress;
+
+    LOAD_FUNC(eglGetDisplay);
+    LOAD_FUNC(eglInitialize);
+    LOAD_FUNC(eglTerminate);
+    LOAD_FUNC(eglChooseConfig);
+    LOAD_FUNC(eglGetConfigAttrib);
+    LOAD_FUNC(eglCreateContext);
+    LOAD_FUNC(eglDestroyContext);
+    LOAD_FUNC(eglCreateWindowSurface);
+    LOAD_FUNC(eglDestroySurface);
+    LOAD_FUNC(eglMakeCurrent);
+    LOAD_FUNC(eglSwapBuffers);
+    LOAD_FUNC(eglSwapInterval);
+    LOAD_FUNC(eglWaitNative);
+    LOAD_FUNC(eglWaitGL);
+    LOAD_FUNC(eglBindAPI);
+    LOAD_FUNC(eglQueryString);
+    LOAD_FUNC(eglGetError);
+
+    _this->egl_data->egl_display = _this->egl_data->eglGetDisplay(EGL_DEFAULT_DISPLAY);
+    if (!_this->egl_data->egl_display) {
+        return SDL_SetError("Could not get EGL display");
+    }
+    
+    if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
+        return SDL_SetError("Could not initialize EGL");
+    }
+
+    if (path) {
+        SDL_strlcpy(_this->gl_config.driver_path, path, sizeof(_this->gl_config.driver_path) - 1);
+    } else {
+        *_this->gl_config.driver_path = '\0';
+    }
+    
+    return 0;
+}
+
+void
+Emscripten_GLES_DeleteContext(_THIS, SDL_GLContext context)
+{
+    /*
+    WebGL contexts can't actually be deleted, so we need to reset it.
+    ES2 renderer resets state on init anyway, clearing the canvas should be enough
+    */
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+    SDL_EGL_DeleteContext(_this, context);
+}
+
+SDL_EGL_CreateContext_impl(Emscripten)
+SDL_EGL_SwapWindow_impl(Emscripten)
+SDL_EGL_MakeCurrent_impl(Emscripten)
+
+void
+Emscripten_GLES_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
+{
+    SDL_WindowData *data;
+    if (window->driverdata) {
+        data = (SDL_WindowData *) window->driverdata;
+
+        if (w) {
+            *w = window->w * data->pixel_ratio;
+        }
+
+        if (h) {
+            *h = window->h * data->pixel_ratio;
+        }
+    }
+}
+
+#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL */
+
+/* vi: set ts=4 sw=4 expandtab: */
+
diff --git a/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenopengles.h b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenopengles.h
new file mode 100644
index 0000000..fbd93cb
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenopengles.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_emscriptenopengles_h_
+#define SDL_emscriptenopengles_h_
+
+#if SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL
+
+#include "../SDL_sysvideo.h"
+#include "../SDL_egl_c.h"
+
+/* OpenGLES functions */
+#define Emscripten_GLES_GetAttribute SDL_EGL_GetAttribute
+#define Emscripten_GLES_GetProcAddress SDL_EGL_GetProcAddress
+#define Emscripten_GLES_UnloadLibrary SDL_EGL_UnloadLibrary
+#define Emscripten_GLES_SetSwapInterval SDL_EGL_SetSwapInterval
+#define Emscripten_GLES_GetSwapInterval SDL_EGL_GetSwapInterval
+
+extern int Emscripten_GLES_LoadLibrary(_THIS, const char *path);
+extern void Emscripten_GLES_DeleteContext(_THIS, SDL_GLContext context);
+extern SDL_GLContext Emscripten_GLES_CreateContext(_THIS, SDL_Window * window);
+extern int Emscripten_GLES_SwapWindow(_THIS, SDL_Window * window);
+extern int Emscripten_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context);
+extern void Emscripten_GLES_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h);
+
+#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL */
+
+#endif /* SDL_emscriptenopengles_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenvideo.c b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenvideo.c
new file mode 100644
index 0000000..cbb933d
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenvideo.c
@@ -0,0 +1,354 @@
+/*
+  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_EMSCRIPTEN
+
+#include "SDL_video.h"
+#include "SDL_mouse.h"
+#include "SDL_hints.h"
+#include "../SDL_sysvideo.h"
+#include "../SDL_pixels_c.h"
+#include "../SDL_egl_c.h"
+#include "../../events/SDL_events_c.h"
+
+#include "SDL_emscriptenvideo.h"
+#include "SDL_emscriptenopengles.h"
+#include "SDL_emscriptenframebuffer.h"
+#include "SDL_emscriptenevents.h"
+#include "SDL_emscriptenmouse.h"
+
+#define EMSCRIPTENVID_DRIVER_NAME "emscripten"
+
+/* Initialization/Query functions */
+static int Emscripten_VideoInit(_THIS);
+static int Emscripten_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
+static void Emscripten_VideoQuit(_THIS);
+
+static int Emscripten_CreateWindow(_THIS, SDL_Window * window);
+static void Emscripten_SetWindowSize(_THIS, SDL_Window * window);
+static void Emscripten_DestroyWindow(_THIS, SDL_Window * window);
+static void Emscripten_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen);
+static void Emscripten_PumpEvents(_THIS);
+static void Emscripten_SetWindowTitle(_THIS, SDL_Window * window);
+
+
+/* Emscripten driver bootstrap functions */
+
+static int
+Emscripten_Available(void)
+{
+    return (1);
+}
+
+static void
+Emscripten_DeleteDevice(SDL_VideoDevice * device)
+{
+    SDL_free(device);
+}
+
+static SDL_VideoDevice *
+Emscripten_CreateDevice(int devindex)
+{
+    SDL_VideoDevice *device;
+
+    /* Initialize all variables that we clean on shutdown */
+    device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
+    if (!device) {
+        SDL_OutOfMemory();
+        return (0);
+    }
+
+    /* Firefox sends blur event which would otherwise prevent full screen
+     * when the user clicks to allow full screen.
+     * See https://bugzilla.mozilla.org/show_bug.cgi?id=1144964
+    */
+    SDL_SetHint(SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS, "0");
+
+    /* Set the function pointers */
+    device->VideoInit = Emscripten_VideoInit;
+    device->VideoQuit = Emscripten_VideoQuit;
+    device->SetDisplayMode = Emscripten_SetDisplayMode;
+
+
+    device->PumpEvents = Emscripten_PumpEvents;
+
+    device->CreateSDLWindow = Emscripten_CreateWindow;
+    device->SetWindowTitle = Emscripten_SetWindowTitle;
+    /*device->SetWindowIcon = Emscripten_SetWindowIcon;
+    device->SetWindowPosition = Emscripten_SetWindowPosition;*/
+    device->SetWindowSize = Emscripten_SetWindowSize;
+    /*device->ShowWindow = Emscripten_ShowWindow;
+    device->HideWindow = Emscripten_HideWindow;
+    device->RaiseWindow = Emscripten_RaiseWindow;
+    device->MaximizeWindow = Emscripten_MaximizeWindow;
+    device->MinimizeWindow = Emscripten_MinimizeWindow;
+    device->RestoreWindow = Emscripten_RestoreWindow;
+    device->SetWindowGrab = Emscripten_SetWindowGrab;*/
+    device->DestroyWindow = Emscripten_DestroyWindow;
+    device->SetWindowFullscreen = Emscripten_SetWindowFullscreen;
+
+    device->CreateWindowFramebuffer = Emscripten_CreateWindowFramebuffer;
+    device->UpdateWindowFramebuffer = Emscripten_UpdateWindowFramebuffer;
+    device->DestroyWindowFramebuffer = Emscripten_DestroyWindowFramebuffer;
+
+#if SDL_VIDEO_OPENGL_EGL
+    device->GL_LoadLibrary = Emscripten_GLES_LoadLibrary;
+    device->GL_GetProcAddress = Emscripten_GLES_GetProcAddress;
+    device->GL_UnloadLibrary = Emscripten_GLES_UnloadLibrary;
+    device->GL_CreateContext = Emscripten_GLES_CreateContext;
+    device->GL_MakeCurrent = Emscripten_GLES_MakeCurrent;
+    device->GL_SetSwapInterval = Emscripten_GLES_SetSwapInterval;
+    device->GL_GetSwapInterval = Emscripten_GLES_GetSwapInterval;
+    device->GL_SwapWindow = Emscripten_GLES_SwapWindow;
+    device->GL_DeleteContext = Emscripten_GLES_DeleteContext;
+    device->GL_GetDrawableSize = Emscripten_GLES_GetDrawableSize;
+#endif
+
+    device->free = Emscripten_DeleteDevice;
+
+    return device;
+}
+
+VideoBootStrap Emscripten_bootstrap = {
+    EMSCRIPTENVID_DRIVER_NAME, "SDL emscripten video driver",
+    Emscripten_Available, Emscripten_CreateDevice
+};
+
+
+int
+Emscripten_VideoInit(_THIS)
+{
+    SDL_DisplayMode mode;
+
+    /* Use a fake 32-bpp desktop mode */
+    mode.format = SDL_PIXELFORMAT_RGB888;
+
+    mode.w = EM_ASM_INT_V({
+        return screen.width;
+    });
+
+    mode.h = EM_ASM_INT_V({
+        return screen.height;
+    });
+
+    mode.refresh_rate = 0;
+    mode.driverdata = NULL;
+    if (SDL_AddBasicVideoDisplay(&mode) < 0) {
+        return -1;
+    }
+
+    SDL_zero(mode);
+    SDL_AddDisplayMode(&_this->displays[0], &mode);
+
+    Emscripten_InitMouse();
+
+    /* We're done! */
+    return 0;
+}
+
+static int
+Emscripten_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
+{
+    /* can't do this */
+    return 0;
+}
+
+static void
+Emscripten_VideoQuit(_THIS)
+{
+    Emscripten_FiniMouse();
+}
+
+static void
+Emscripten_PumpEvents(_THIS)
+{
+    /* do nothing. */
+}
+
+static int
+Emscripten_CreateWindow(_THIS, SDL_Window * window)
+{
+    SDL_WindowData *wdata;
+    double scaled_w, scaled_h;
+    double css_w, css_h;
+
+    /* Allocate window internal data */
+    wdata = (SDL_WindowData *) SDL_calloc(1, sizeof(SDL_WindowData));
+    if (wdata == NULL) {
+        return SDL_OutOfMemory();
+    }
+
+    if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
+        wdata->pixel_ratio = emscripten_get_device_pixel_ratio();
+    } else {
+        wdata->pixel_ratio = 1.0f;
+    }
+
+    scaled_w = SDL_floor(window->w * wdata->pixel_ratio);
+    scaled_h = SDL_floor(window->h * wdata->pixel_ratio);
+
+    emscripten_set_canvas_size(scaled_w, scaled_h);
+
+    emscripten_get_element_css_size(NULL, &css_w, &css_h);
+
+    wdata->external_size = SDL_floor(css_w) != scaled_w || SDL_floor(css_h) != scaled_h;
+
+    if ((window->flags & SDL_WINDOW_RESIZABLE) && wdata->external_size) {
+        /* external css has resized us */
+        scaled_w = css_w * wdata->pixel_ratio;
+        scaled_h = css_h * wdata->pixel_ratio;
+
+        emscripten_set_canvas_size(scaled_w, scaled_h);
+        SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESIZED, css_w, css_h);
+    }
+
+    /* if the size is not being controlled by css, we need to scale down for hidpi */
+    if (!wdata->external_size) {
+        if (wdata->pixel_ratio != 1.0f) {
+            /*scale canvas down*/
+            emscripten_set_element_css_size(NULL, window->w, window->h);
+        }
+    }
+
+#if SDL_VIDEO_OPENGL_EGL
+    if (window->flags & SDL_WINDOW_OPENGL) {
+        if (!_this->egl_data) {
+            if (SDL_GL_LoadLibrary(NULL) < 0) {
+                return -1;
+            }
+        }
+        wdata->egl_surface = SDL_EGL_CreateSurface(_this, 0);
+
+        if (wdata->egl_surface == EGL_NO_SURFACE) {
+            return SDL_SetError("Could not create GLES window surface");
+        }
+    }
+#endif
+
+    wdata->window = window;
+
+    /* Setup driver data for this window */
+    window->driverdata = wdata;
+
+    /* One window, it always has focus */
+    SDL_SetMouseFocus(window);
+    SDL_SetKeyboardFocus(window);
+
+    Emscripten_RegisterEventHandlers(wdata);
+
+    /* Window has been successfully created */
+    return 0;
+}
+
+static void Emscripten_SetWindowSize(_THIS, SDL_Window * window)
+{
+    SDL_WindowData *data;
+
+    if (window->driverdata) {
+        data = (SDL_WindowData *) window->driverdata;
+        /* update pixel ratio */
+        if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
+            data->pixel_ratio = emscripten_get_device_pixel_ratio();
+        }
+        emscripten_set_canvas_size(window->w * data->pixel_ratio, window->h * data->pixel_ratio);
+
+        /*scale canvas down*/
+        if (!data->external_size && data->pixel_ratio != 1.0f) {
+            emscripten_set_element_css_size(NULL, window->w, window->h);
+        }
+    }
+}
+
+static void
+Emscripten_DestroyWindow(_THIS, SDL_Window * window)
+{
+    SDL_WindowData *data;
+
+    if(window->driverdata) {
+        data = (SDL_WindowData *) window->driverdata;
+
+        Emscripten_UnregisterEventHandlers(data);
+#if SDL_VIDEO_OPENGL_EGL
+        if (data->egl_surface != EGL_NO_SURFACE) {
+            SDL_EGL_DestroySurface(_this, data->egl_surface);
+            data->egl_surface = EGL_NO_SURFACE;
+        }
+#endif
+        SDL_free(window->driverdata);
+        window->driverdata = NULL;
+    }
+}
+
+static void
+Emscripten_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen)
+{
+    SDL_WindowData *data;
+    if(window->driverdata) {
+        data = (SDL_WindowData *) window->driverdata;
+
+        if(fullscreen) {
+            EmscriptenFullscreenStrategy strategy;
+            SDL_bool is_desktop_fullscreen = (window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP;
+            int res;
+
+            strategy.scaleMode = is_desktop_fullscreen ? EMSCRIPTEN_FULLSCREEN_SCALE_STRETCH : EMSCRIPTEN_FULLSCREEN_SCALE_ASPECT;
+
+            if(!is_desktop_fullscreen) {
+                strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_NONE;
+            } else if(window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
+                strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_HIDEF;
+            } else {
+                strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_STDDEF;
+            }
+
+            strategy.filteringMode = EMSCRIPTEN_FULLSCREEN_FILTERING_DEFAULT;
+
+            strategy.canvasResizedCallback = Emscripten_HandleCanvasResize;
+            strategy.canvasResizedCallbackUserData = data;
+
+            data->requested_fullscreen_mode = window->flags & (SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);
+            data->fullscreen_resize = is_desktop_fullscreen;
+
+            res = emscripten_request_fullscreen_strategy(NULL, 1, &strategy);
+            if(res != EMSCRIPTEN_RESULT_SUCCESS && res != EMSCRIPTEN_RESULT_DEFERRED) {
+                /* unset flags, fullscreen failed */
+                window->flags &= ~(SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);
+            }
+        }
+        else
+            emscripten_exit_fullscreen();
+    }
+}
+
+static void
+Emscripten_SetWindowTitle(_THIS, SDL_Window * window) {
+    EM_ASM_INT({
+      if (typeof Module['setWindowTitle'] !== 'undefined') {
+        Module['setWindowTitle'](Module['Pointer_stringify']($0));
+      }
+      return 0;
+    }, window->title);
+}
+
+#endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenvideo.h b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenvideo.h
new file mode 100644
index 0000000..c2001b0
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/emscripten/SDL_emscriptenvideo.h
@@ -0,0 +1,58 @@
+/*
+  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_emscriptenvideo_h_
+#define SDL_emscriptenvideo_h_
+
+#include "../SDL_sysvideo.h"
+#include "../../events/SDL_touch_c.h"
+#include <emscripten/emscripten.h>
+#include <emscripten/html5.h>
+
+#if SDL_VIDEO_OPENGL_EGL
+#include <EGL/egl.h>
+#endif
+
+typedef struct SDL_WindowData
+{
+#if SDL_VIDEO_OPENGL_EGL
+    EGLSurface egl_surface;
+#endif
+    SDL_Window *window;
+    SDL_Surface *surface;
+
+    float pixel_ratio;
+
+    SDL_bool external_size;
+
+    int requested_fullscreen_mode;
+    SDL_bool fullscreen_resize;
+
+    SDL_bool finger_touching;  /* for mapping touch events to mice */
+    SDL_FingerID first_finger;
+
+    SDL_bool has_pointer_lock;
+} SDL_WindowData;
+
+#endif /* SDL_emscriptenvideo_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */