1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
4
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.
8
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:
12
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.
20 */
21 #include "../../SDL_internal.h"
22
23 #if SDL_VIDEO_DRIVER_EMSCRIPTEN
24
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"
32
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"
38
39 #define EMSCRIPTENVID_DRIVER_NAME "emscripten"
40
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);
45 static int Emscripten_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect);
46
47 static int Emscripten_CreateWindow(_THIS, SDL_Window * window);
48 static void Emscripten_SetWindowSize(_THIS, SDL_Window * window);
49 static void Emscripten_DestroyWindow(_THIS, SDL_Window * window);
50 static void Emscripten_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen);
51 static void Emscripten_PumpEvents(_THIS);
52 static void Emscripten_SetWindowTitle(_THIS, SDL_Window * window);
53
54
55 /* Emscripten driver bootstrap functions */
56
57 static void
Emscripten_DeleteDevice(SDL_VideoDevice * device)58 Emscripten_DeleteDevice(SDL_VideoDevice * device)
59 {
60 SDL_free(device);
61 }
62
63 static SDL_VideoDevice *
Emscripten_CreateDevice(int devindex)64 Emscripten_CreateDevice(int devindex)
65 {
66 SDL_VideoDevice *device;
67
68 /* Initialize all variables that we clean on shutdown */
69 device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
70 if (!device) {
71 SDL_OutOfMemory();
72 return (0);
73 }
74
75 /* Firefox sends blur event which would otherwise prevent full screen
76 * when the user clicks to allow full screen.
77 * See https://bugzilla.mozilla.org/show_bug.cgi?id=1144964
78 */
79 SDL_SetHint(SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS, "0");
80
81 /* Set the function pointers */
82 device->VideoInit = Emscripten_VideoInit;
83 device->VideoQuit = Emscripten_VideoQuit;
84 device->GetDisplayUsableBounds = Emscripten_GetDisplayUsableBounds;
85 device->SetDisplayMode = Emscripten_SetDisplayMode;
86
87
88 device->PumpEvents = Emscripten_PumpEvents;
89
90 device->CreateSDLWindow = Emscripten_CreateWindow;
91 device->SetWindowTitle = Emscripten_SetWindowTitle;
92 /*device->SetWindowIcon = Emscripten_SetWindowIcon;
93 device->SetWindowPosition = Emscripten_SetWindowPosition;*/
94 device->SetWindowSize = Emscripten_SetWindowSize;
95 /*device->ShowWindow = Emscripten_ShowWindow;
96 device->HideWindow = Emscripten_HideWindow;
97 device->RaiseWindow = Emscripten_RaiseWindow;
98 device->MaximizeWindow = Emscripten_MaximizeWindow;
99 device->MinimizeWindow = Emscripten_MinimizeWindow;
100 device->RestoreWindow = Emscripten_RestoreWindow;
101 device->SetWindowMouseGrab = Emscripten_SetWindowMouseGrab;*/
102 device->DestroyWindow = Emscripten_DestroyWindow;
103 device->SetWindowFullscreen = Emscripten_SetWindowFullscreen;
104
105 device->CreateWindowFramebuffer = Emscripten_CreateWindowFramebuffer;
106 device->UpdateWindowFramebuffer = Emscripten_UpdateWindowFramebuffer;
107 device->DestroyWindowFramebuffer = Emscripten_DestroyWindowFramebuffer;
108
109 #if SDL_VIDEO_OPENGL_EGL
110 device->GL_LoadLibrary = Emscripten_GLES_LoadLibrary;
111 device->GL_GetProcAddress = Emscripten_GLES_GetProcAddress;
112 device->GL_UnloadLibrary = Emscripten_GLES_UnloadLibrary;
113 device->GL_CreateContext = Emscripten_GLES_CreateContext;
114 device->GL_MakeCurrent = Emscripten_GLES_MakeCurrent;
115 device->GL_SetSwapInterval = Emscripten_GLES_SetSwapInterval;
116 device->GL_GetSwapInterval = Emscripten_GLES_GetSwapInterval;
117 device->GL_SwapWindow = Emscripten_GLES_SwapWindow;
118 device->GL_DeleteContext = Emscripten_GLES_DeleteContext;
119 device->GL_GetDrawableSize = Emscripten_GLES_GetDrawableSize;
120 #endif
121
122 device->free = Emscripten_DeleteDevice;
123
124 return device;
125 }
126
127 VideoBootStrap Emscripten_bootstrap = {
128 EMSCRIPTENVID_DRIVER_NAME, "SDL emscripten video driver",
129 Emscripten_CreateDevice
130 };
131
132
133 int
Emscripten_VideoInit(_THIS)134 Emscripten_VideoInit(_THIS)
135 {
136 SDL_DisplayMode mode;
137
138 /* Use a fake 32-bpp desktop mode */
139 mode.format = SDL_PIXELFORMAT_RGB888;
140 emscripten_get_screen_size(&mode.w, &mode.h);
141
142 mode.refresh_rate = 0;
143 mode.driverdata = NULL;
144 if (SDL_AddBasicVideoDisplay(&mode) < 0) {
145 return -1;
146 }
147
148 SDL_AddDisplayMode(&_this->displays[0], &mode);
149
150 Emscripten_InitMouse();
151
152 /* We're done! */
153 return 0;
154 }
155
156 static int
Emscripten_SetDisplayMode(_THIS,SDL_VideoDisplay * display,SDL_DisplayMode * mode)157 Emscripten_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
158 {
159 /* can't do this */
160 return 0;
161 }
162
163 static void
Emscripten_VideoQuit(_THIS)164 Emscripten_VideoQuit(_THIS)
165 {
166 Emscripten_FiniMouse();
167 }
168
169 static int
Emscripten_GetDisplayUsableBounds(_THIS,SDL_VideoDisplay * display,SDL_Rect * rect)170 Emscripten_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect)
171 {
172 if (rect) {
173 rect->x = 0;
174 rect->y = 0;
175 rect->w = EM_ASM_INT_V({
176 return window.innerWidth;
177 });
178 rect->h = EM_ASM_INT_V({
179 return window.innerHeight;
180 });
181 }
182 return 0;
183 }
184
185 static void
Emscripten_PumpEvents(_THIS)186 Emscripten_PumpEvents(_THIS)
187 {
188 /* do nothing. */
189 }
190
191 static int
Emscripten_CreateWindow(_THIS,SDL_Window * window)192 Emscripten_CreateWindow(_THIS, SDL_Window * window)
193 {
194 SDL_WindowData *wdata;
195 double scaled_w, scaled_h;
196 double css_w, css_h;
197
198 /* Allocate window internal data */
199 wdata = (SDL_WindowData *) SDL_calloc(1, sizeof(SDL_WindowData));
200 if (wdata == NULL) {
201 return SDL_OutOfMemory();
202 }
203
204 wdata->canvas_id = SDL_strdup("#canvas");
205
206 if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
207 wdata->pixel_ratio = emscripten_get_device_pixel_ratio();
208 } else {
209 wdata->pixel_ratio = 1.0f;
210 }
211
212 scaled_w = SDL_floor(window->w * wdata->pixel_ratio);
213 scaled_h = SDL_floor(window->h * wdata->pixel_ratio);
214
215 /* set a fake size to check if there is any CSS sizing the canvas */
216 emscripten_set_canvas_element_size(wdata->canvas_id, 1, 1);
217 emscripten_get_element_css_size(wdata->canvas_id, &css_w, &css_h);
218
219 wdata->external_size = SDL_floor(css_w) != 1 || SDL_floor(css_h) != 1;
220
221 if ((window->flags & SDL_WINDOW_RESIZABLE) && wdata->external_size) {
222 /* external css has resized us */
223 scaled_w = css_w * wdata->pixel_ratio;
224 scaled_h = css_h * wdata->pixel_ratio;
225
226 SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESIZED, css_w, css_h);
227 }
228 emscripten_set_canvas_element_size(wdata->canvas_id, scaled_w, scaled_h);
229
230 /* if the size is not being controlled by css, we need to scale down for hidpi */
231 if (!wdata->external_size) {
232 if (wdata->pixel_ratio != 1.0f) {
233 /*scale canvas down*/
234 emscripten_set_element_css_size(wdata->canvas_id, window->w, window->h);
235 }
236 }
237
238 #if SDL_VIDEO_OPENGL_EGL
239 if (window->flags & SDL_WINDOW_OPENGL) {
240 if (!_this->egl_data) {
241 if (SDL_GL_LoadLibrary(NULL) < 0) {
242 return -1;
243 }
244 }
245 wdata->egl_surface = SDL_EGL_CreateSurface(_this, 0);
246
247 if (wdata->egl_surface == EGL_NO_SURFACE) {
248 return SDL_SetError("Could not create GLES window surface");
249 }
250 }
251 #endif
252
253 wdata->window = window;
254
255 /* Setup driver data for this window */
256 window->driverdata = wdata;
257
258 /* One window, it always has focus */
259 SDL_SetMouseFocus(window);
260 SDL_SetKeyboardFocus(window);
261
262 Emscripten_RegisterEventHandlers(wdata);
263
264 /* Window has been successfully created */
265 return 0;
266 }
267
Emscripten_SetWindowSize(_THIS,SDL_Window * window)268 static void Emscripten_SetWindowSize(_THIS, SDL_Window * window)
269 {
270 SDL_WindowData *data;
271
272 if (window->driverdata) {
273 data = (SDL_WindowData *) window->driverdata;
274 /* update pixel ratio */
275 if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
276 data->pixel_ratio = emscripten_get_device_pixel_ratio();
277 }
278 emscripten_set_canvas_element_size(data->canvas_id, window->w * data->pixel_ratio, window->h * data->pixel_ratio);
279
280 /*scale canvas down*/
281 if (!data->external_size && data->pixel_ratio != 1.0f) {
282 emscripten_set_element_css_size(data->canvas_id, window->w, window->h);
283 }
284 }
285 }
286
287 static void
Emscripten_DestroyWindow(_THIS,SDL_Window * window)288 Emscripten_DestroyWindow(_THIS, SDL_Window * window)
289 {
290 SDL_WindowData *data;
291
292 if(window->driverdata) {
293 data = (SDL_WindowData *) window->driverdata;
294
295 Emscripten_UnregisterEventHandlers(data);
296 #if SDL_VIDEO_OPENGL_EGL
297 if (data->egl_surface != EGL_NO_SURFACE) {
298 SDL_EGL_DestroySurface(_this, data->egl_surface);
299 data->egl_surface = EGL_NO_SURFACE;
300 }
301 #endif
302
303 /* We can't destroy the canvas, so resize it to zero instead */
304 emscripten_set_canvas_element_size(data->canvas_id, 0, 0);
305 SDL_free(data->canvas_id);
306
307 SDL_free(window->driverdata);
308 window->driverdata = NULL;
309 }
310 }
311
312 static void
Emscripten_SetWindowFullscreen(_THIS,SDL_Window * window,SDL_VideoDisplay * display,SDL_bool fullscreen)313 Emscripten_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen)
314 {
315 SDL_WindowData *data;
316 if(window->driverdata) {
317 data = (SDL_WindowData *) window->driverdata;
318
319 if(fullscreen) {
320 EmscriptenFullscreenStrategy strategy;
321 SDL_bool is_desktop_fullscreen = (window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP;
322 int res;
323
324 strategy.scaleMode = is_desktop_fullscreen ? EMSCRIPTEN_FULLSCREEN_SCALE_STRETCH : EMSCRIPTEN_FULLSCREEN_SCALE_ASPECT;
325
326 if(!is_desktop_fullscreen) {
327 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_NONE;
328 } else if(window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
329 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_HIDEF;
330 } else {
331 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_STDDEF;
332 }
333
334 strategy.filteringMode = EMSCRIPTEN_FULLSCREEN_FILTERING_DEFAULT;
335
336 strategy.canvasResizedCallback = Emscripten_HandleCanvasResize;
337 strategy.canvasResizedCallbackUserData = data;
338
339 data->requested_fullscreen_mode = window->flags & (SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);
340 data->fullscreen_resize = is_desktop_fullscreen;
341
342 res = emscripten_request_fullscreen_strategy(data->canvas_id, 1, &strategy);
343 if(res != EMSCRIPTEN_RESULT_SUCCESS && res != EMSCRIPTEN_RESULT_DEFERRED) {
344 /* unset flags, fullscreen failed */
345 window->flags &= ~(SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);
346 }
347 }
348 else
349 emscripten_exit_fullscreen();
350 }
351 }
352
353 static void
Emscripten_SetWindowTitle(_THIS,SDL_Window * window)354 Emscripten_SetWindowTitle(_THIS, SDL_Window * window) {
355 emscripten_set_window_title(window->title);
356 }
357
358 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
359
360 /* vi: set ts=4 sw=4 expandtab: */
361