2 Simple DirectMedia Layer
3 Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
21 #include "../../SDL_internal.h"
23 #if SDL_VIDEO_DRIVER_EMSCRIPTEN
25 #include "SDL_video.h"
26 #include "SDL_mouse.h"
27 #include "SDL_hints.h"
28 #include "../SDL_sysvideo.h"
29 #include "../SDL_pixels_c.h"
30 #include "../SDL_egl_c.h"
31 #include "../../events/SDL_events_c.h"
33 #include "SDL_emscriptenvideo.h"
34 #include "SDL_emscriptenopengles.h"
35 #include "SDL_emscriptenframebuffer.h"
36 #include "SDL_emscriptenevents.h"
37 #include "SDL_emscriptenmouse.h"
39 #define EMSCRIPTENVID_DRIVER_NAME "emscripten"
41 /* Initialization/Query functions */
42 static int Emscripten_VideoInit(_THIS);
43 static int Emscripten_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
44 static void Emscripten_VideoQuit(_THIS);
46 static int Emscripten_CreateWindow(_THIS, SDL_Window * window);
47 static void Emscripten_SetWindowSize(_THIS, SDL_Window * window);
48 static void Emscripten_DestroyWindow(_THIS, SDL_Window * window);
49 static void Emscripten_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen);
50 static void Emscripten_PumpEvents(_THIS);
51 static void Emscripten_SetWindowTitle(_THIS, SDL_Window * window);
54 /* Emscripten driver bootstrap functions */
57 Emscripten_Available(void)
63 Emscripten_DeleteDevice(SDL_VideoDevice * device)
68 static SDL_VideoDevice *
69 Emscripten_CreateDevice(int devindex)
71 SDL_VideoDevice *device;
73 /* Initialize all variables that we clean on shutdown */
74 device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
80 /* Firefox sends blur event which would otherwise prevent full screen */
81 SDL_SetHint(SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS, "0");
83 /* Set the function pointers */
84 device->VideoInit = Emscripten_VideoInit;
85 device->VideoQuit = Emscripten_VideoQuit;
86 device->SetDisplayMode = Emscripten_SetDisplayMode;
89 device->PumpEvents = Emscripten_PumpEvents;
91 device->CreateWindow = Emscripten_CreateWindow;
92 /*device->CreateWindowFrom = Emscripten_CreateWindowFrom;*/
93 device->SetWindowTitle = Emscripten_SetWindowTitle;
94 /*device->SetWindowIcon = Emscripten_SetWindowIcon;
95 device->SetWindowPosition = Emscripten_SetWindowPosition;*/
96 device->SetWindowSize = Emscripten_SetWindowSize;
97 /*device->ShowWindow = Emscripten_ShowWindow;
98 device->HideWindow = Emscripten_HideWindow;
99 device->RaiseWindow = Emscripten_RaiseWindow;
100 device->MaximizeWindow = Emscripten_MaximizeWindow;
101 device->MinimizeWindow = Emscripten_MinimizeWindow;
102 device->RestoreWindow = Emscripten_RestoreWindow;
103 device->SetWindowGrab = Emscripten_SetWindowGrab;*/
104 device->DestroyWindow = Emscripten_DestroyWindow;
105 device->SetWindowFullscreen = Emscripten_SetWindowFullscreen;
107 device->CreateWindowFramebuffer = Emscripten_CreateWindowFramebuffer;
108 device->UpdateWindowFramebuffer = Emscripten_UpdateWindowFramebuffer;
109 device->DestroyWindowFramebuffer = Emscripten_DestroyWindowFramebuffer;
111 device->GL_LoadLibrary = Emscripten_GLES_LoadLibrary;
112 device->GL_GetProcAddress = Emscripten_GLES_GetProcAddress;
113 device->GL_UnloadLibrary = Emscripten_GLES_UnloadLibrary;
114 device->GL_CreateContext = Emscripten_GLES_CreateContext;
115 device->GL_MakeCurrent = Emscripten_GLES_MakeCurrent;
116 device->GL_SetSwapInterval = Emscripten_GLES_SetSwapInterval;
117 device->GL_GetSwapInterval = Emscripten_GLES_GetSwapInterval;
118 device->GL_SwapWindow = Emscripten_GLES_SwapWindow;
119 device->GL_DeleteContext = Emscripten_GLES_DeleteContext;
120 device->GL_GetDrawableSize = Emscripten_GLES_GetDrawableSize;
122 device->free = Emscripten_DeleteDevice;
127 VideoBootStrap Emscripten_bootstrap = {
128 EMSCRIPTENVID_DRIVER_NAME, "SDL emscripten video driver",
129 Emscripten_Available, Emscripten_CreateDevice
134 Emscripten_VideoInit(_THIS)
136 SDL_DisplayMode mode;
138 /* Use a fake 32-bpp desktop mode */
139 mode.format = SDL_PIXELFORMAT_RGB888;
141 mode.w = EM_ASM_INT_V({
145 mode.h = EM_ASM_INT_V({
146 return screen.height;
149 mode.refresh_rate = 0;
150 mode.driverdata = NULL;
151 if (SDL_AddBasicVideoDisplay(&mode) < 0) {
156 SDL_AddDisplayMode(&_this->displays[0], &mode);
158 Emscripten_InitMouse();
165 Emscripten_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
172 Emscripten_VideoQuit(_THIS)
174 Emscripten_FiniMouse();
178 Emscripten_PumpEvents(_THIS)
184 Emscripten_CreateWindow(_THIS, SDL_Window * window)
186 SDL_WindowData *wdata;
187 double scaled_w, scaled_h;
190 /* Allocate window internal data */
191 wdata = (SDL_WindowData *) SDL_calloc(1, sizeof(SDL_WindowData));
193 return SDL_OutOfMemory();
196 if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
197 wdata->pixel_ratio = emscripten_get_device_pixel_ratio();
199 wdata->pixel_ratio = 1.0f;
202 scaled_w = SDL_floor(window->w * wdata->pixel_ratio);
203 scaled_h = SDL_floor(window->h * wdata->pixel_ratio);
205 emscripten_set_canvas_size(scaled_w, scaled_h);
207 emscripten_get_element_css_size(NULL, &css_w, &css_h);
209 wdata->external_size = css_w != scaled_w || css_h != scaled_h;
211 if ((window->flags & SDL_WINDOW_RESIZABLE) && wdata->external_size) {
212 /* external css has resized us */
213 scaled_w = css_w * wdata->pixel_ratio;
214 scaled_h = css_h * wdata->pixel_ratio;
216 emscripten_set_canvas_size(scaled_w, scaled_h);
217 SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESIZED, css_w, css_h);
220 /* if the size is not being controlled by css, we need to scale down for hidpi */
221 if (!wdata->external_size) {
222 if (wdata->pixel_ratio != 1.0f) {
223 /*scale canvas down*/
224 emscripten_set_element_css_size(NULL, window->w, window->h);
228 if (window->flags & SDL_WINDOW_OPENGL) {
229 if (!_this->egl_data) {
230 if (SDL_GL_LoadLibrary(NULL) < 0) {
234 wdata->egl_surface = SDL_EGL_CreateSurface(_this, 0);
236 if (wdata->egl_surface == EGL_NO_SURFACE) {
237 return SDL_SetError("Could not create GLES window surface");
241 wdata->window = window;
243 /* Setup driver data for this window */
244 window->driverdata = wdata;
246 /* One window, it always has focus */
247 SDL_SetMouseFocus(window);
248 SDL_SetKeyboardFocus(window);
250 Emscripten_RegisterEventHandlers(wdata);
252 /* Window has been successfully created */
256 static void Emscripten_SetWindowSize(_THIS, SDL_Window * window)
258 SDL_WindowData *data;
260 if (window->driverdata) {
261 data = (SDL_WindowData *) window->driverdata;
262 emscripten_set_canvas_size(window->w * data->pixel_ratio, window->h * data->pixel_ratio);
264 /*scale canvas down*/
265 if (!data->external_size && data->pixel_ratio != 1.0f) {
266 emscripten_set_element_css_size(NULL, window->w, window->h);
272 Emscripten_DestroyWindow(_THIS, SDL_Window * window)
274 SDL_WindowData *data;
276 if(window->driverdata) {
277 data = (SDL_WindowData *) window->driverdata;
279 Emscripten_UnregisterEventHandlers(data);
280 if (data->egl_surface != EGL_NO_SURFACE) {
281 SDL_EGL_DestroySurface(_this, data->egl_surface);
282 data->egl_surface = EGL_NO_SURFACE;
284 SDL_free(window->driverdata);
285 window->driverdata = NULL;
290 Emscripten_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen)
292 SDL_WindowData *data;
293 if(window->driverdata) {
294 data = (SDL_WindowData *) window->driverdata;
297 EmscriptenFullscreenStrategy strategy;
298 SDL_bool is_desktop_fullscreen = (window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP;
300 strategy.scaleMode = is_desktop_fullscreen ? EMSCRIPTEN_FULLSCREEN_SCALE_STRETCH : EMSCRIPTEN_FULLSCREEN_SCALE_ASPECT;
302 if(!is_desktop_fullscreen) {
303 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_NONE;
304 } else if(window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
305 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_HIDEF;
307 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_STDDEF;
310 strategy.filteringMode = EMSCRIPTEN_FULLSCREEN_FILTERING_DEFAULT;
312 strategy.canvasResizedCallback = Emscripten_HandleCanvasResize;
313 strategy.canvasResizedCallbackUserData = data;
315 data->requested_fullscreen_mode = window->flags & (SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);
316 data->fullscreen_resize = is_desktop_fullscreen;
317 /*unset the fullscreen flags as we're not actually fullscreen yet*/
318 window->flags &= ~(SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);
320 emscripten_request_fullscreen_strategy(NULL, 1, &strategy);
323 emscripten_exit_fullscreen();
328 Emscripten_SetWindowTitle(_THIS, SDL_Window * window) {
330 if (typeof Module['setWindowTitle'] !== 'undefined') {
331 Module['setWindowTitle'](Module['Pointer_stringify']($0));
337 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
339 /* vi: set ts=4 sw=4 expandtab: */