src/video/emscripten/SDL_emscriptenvideo.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 28 Aug 2017 00:43:14 -0700
changeset 11383 6cafb5954aaf
parent 11191 c3b94a174d81
child 11811 5d94cb6b24d3
permissions -rw-r--r--
Fixed mingw Windows build, since SDL_vulkan_internal.h includes windows.h
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2017 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 
    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);
    52 
    53 
    54 /* Emscripten driver bootstrap functions */
    55 
    56 static int
    57 Emscripten_Available(void)
    58 {
    59     return (1);
    60 }
    61 
    62 static void
    63 Emscripten_DeleteDevice(SDL_VideoDevice * device)
    64 {
    65     SDL_free(device);
    66 }
    67 
    68 static SDL_VideoDevice *
    69 Emscripten_CreateDevice(int devindex)
    70 {
    71     SDL_VideoDevice *device;
    72 
    73     /* Initialize all variables that we clean on shutdown */
    74     device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
    75     if (!device) {
    76         SDL_OutOfMemory();
    77         return (0);
    78     }
    79 
    80     /* Firefox sends blur event which would otherwise prevent full screen
    81      * when the user clicks to allow full screen.
    82      * See https://bugzilla.mozilla.org/show_bug.cgi?id=1144964
    83     */
    84     SDL_SetHint(SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS, "0");
    85 
    86     /* Set the function pointers */
    87     device->VideoInit = Emscripten_VideoInit;
    88     device->VideoQuit = Emscripten_VideoQuit;
    89     device->SetDisplayMode = Emscripten_SetDisplayMode;
    90 
    91 
    92     device->PumpEvents = Emscripten_PumpEvents;
    93 
    94     device->CreateSDLWindow = Emscripten_CreateWindow;
    95     device->SetWindowTitle = Emscripten_SetWindowTitle;
    96     /*device->SetWindowIcon = Emscripten_SetWindowIcon;
    97     device->SetWindowPosition = Emscripten_SetWindowPosition;*/
    98     device->SetWindowSize = Emscripten_SetWindowSize;
    99     /*device->ShowWindow = Emscripten_ShowWindow;
   100     device->HideWindow = Emscripten_HideWindow;
   101     device->RaiseWindow = Emscripten_RaiseWindow;
   102     device->MaximizeWindow = Emscripten_MaximizeWindow;
   103     device->MinimizeWindow = Emscripten_MinimizeWindow;
   104     device->RestoreWindow = Emscripten_RestoreWindow;
   105     device->SetWindowGrab = Emscripten_SetWindowGrab;*/
   106     device->DestroyWindow = Emscripten_DestroyWindow;
   107     device->SetWindowFullscreen = Emscripten_SetWindowFullscreen;
   108 
   109     device->CreateWindowFramebuffer = Emscripten_CreateWindowFramebuffer;
   110     device->UpdateWindowFramebuffer = Emscripten_UpdateWindowFramebuffer;
   111     device->DestroyWindowFramebuffer = Emscripten_DestroyWindowFramebuffer;
   112 
   113 #if SDL_VIDEO_OPENGL_EGL
   114     device->GL_LoadLibrary = Emscripten_GLES_LoadLibrary;
   115     device->GL_GetProcAddress = Emscripten_GLES_GetProcAddress;
   116     device->GL_UnloadLibrary = Emscripten_GLES_UnloadLibrary;
   117     device->GL_CreateContext = Emscripten_GLES_CreateContext;
   118     device->GL_MakeCurrent = Emscripten_GLES_MakeCurrent;
   119     device->GL_SetSwapInterval = Emscripten_GLES_SetSwapInterval;
   120     device->GL_GetSwapInterval = Emscripten_GLES_GetSwapInterval;
   121     device->GL_SwapWindow = Emscripten_GLES_SwapWindow;
   122     device->GL_DeleteContext = Emscripten_GLES_DeleteContext;
   123     device->GL_GetDrawableSize = Emscripten_GLES_GetDrawableSize;
   124 #endif
   125 
   126     device->free = Emscripten_DeleteDevice;
   127 
   128     return device;
   129 }
   130 
   131 VideoBootStrap Emscripten_bootstrap = {
   132     EMSCRIPTENVID_DRIVER_NAME, "SDL emscripten video driver",
   133     Emscripten_Available, Emscripten_CreateDevice
   134 };
   135 
   136 
   137 int
   138 Emscripten_VideoInit(_THIS)
   139 {
   140     SDL_DisplayMode mode;
   141 
   142     /* Use a fake 32-bpp desktop mode */
   143     mode.format = SDL_PIXELFORMAT_RGB888;
   144 
   145     mode.w = EM_ASM_INT_V({
   146         return screen.width;
   147     });
   148 
   149     mode.h = EM_ASM_INT_V({
   150         return screen.height;
   151     });
   152 
   153     mode.refresh_rate = 0;
   154     mode.driverdata = NULL;
   155     if (SDL_AddBasicVideoDisplay(&mode) < 0) {
   156         return -1;
   157     }
   158 
   159     SDL_zero(mode);
   160     SDL_AddDisplayMode(&_this->displays[0], &mode);
   161 
   162     Emscripten_InitMouse();
   163 
   164     /* We're done! */
   165     return 0;
   166 }
   167 
   168 static int
   169 Emscripten_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
   170 {
   171     /* can't do this */
   172     return 0;
   173 }
   174 
   175 static void
   176 Emscripten_VideoQuit(_THIS)
   177 {
   178     Emscripten_FiniMouse();
   179 }
   180 
   181 static void
   182 Emscripten_PumpEvents(_THIS)
   183 {
   184     /* do nothing. */
   185 }
   186 
   187 static int
   188 Emscripten_CreateWindow(_THIS, SDL_Window * window)
   189 {
   190     SDL_WindowData *wdata;
   191     double scaled_w, scaled_h;
   192     double css_w, css_h;
   193 
   194     /* Allocate window internal data */
   195     wdata = (SDL_WindowData *) SDL_calloc(1, sizeof(SDL_WindowData));
   196     if (wdata == NULL) {
   197         return SDL_OutOfMemory();
   198     }
   199 
   200     if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
   201         wdata->pixel_ratio = emscripten_get_device_pixel_ratio();
   202     } else {
   203         wdata->pixel_ratio = 1.0f;
   204     }
   205 
   206     scaled_w = SDL_floor(window->w * wdata->pixel_ratio);
   207     scaled_h = SDL_floor(window->h * wdata->pixel_ratio);
   208 
   209     emscripten_set_canvas_size(scaled_w, scaled_h);
   210 
   211     emscripten_get_element_css_size(NULL, &css_w, &css_h);
   212 
   213     wdata->external_size = SDL_floor(css_w) != scaled_w || SDL_floor(css_h) != scaled_h;
   214 
   215     if ((window->flags & SDL_WINDOW_RESIZABLE) && wdata->external_size) {
   216         /* external css has resized us */
   217         scaled_w = css_w * wdata->pixel_ratio;
   218         scaled_h = css_h * wdata->pixel_ratio;
   219 
   220         emscripten_set_canvas_size(scaled_w, scaled_h);
   221         SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESIZED, css_w, css_h);
   222     }
   223 
   224     /* if the size is not being controlled by css, we need to scale down for hidpi */
   225     if (!wdata->external_size) {
   226         if (wdata->pixel_ratio != 1.0f) {
   227             /*scale canvas down*/
   228             emscripten_set_element_css_size(NULL, window->w, window->h);
   229         }
   230     }
   231 
   232 #if SDL_VIDEO_OPENGL_EGL
   233     if (window->flags & SDL_WINDOW_OPENGL) {
   234         if (!_this->egl_data) {
   235             if (SDL_GL_LoadLibrary(NULL) < 0) {
   236                 return -1;
   237             }
   238         }
   239         wdata->egl_surface = SDL_EGL_CreateSurface(_this, 0);
   240 
   241         if (wdata->egl_surface == EGL_NO_SURFACE) {
   242             return SDL_SetError("Could not create GLES window surface");
   243         }
   244     }
   245 #endif
   246 
   247     wdata->window = window;
   248 
   249     /* Setup driver data for this window */
   250     window->driverdata = wdata;
   251 
   252     /* One window, it always has focus */
   253     SDL_SetMouseFocus(window);
   254     SDL_SetKeyboardFocus(window);
   255 
   256     Emscripten_RegisterEventHandlers(wdata);
   257 
   258     /* Window has been successfully created */
   259     return 0;
   260 }
   261 
   262 static void Emscripten_SetWindowSize(_THIS, SDL_Window * window)
   263 {
   264     SDL_WindowData *data;
   265 
   266     if (window->driverdata) {
   267         data = (SDL_WindowData *) window->driverdata;
   268         /* update pixel ratio */
   269         if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
   270             data->pixel_ratio = emscripten_get_device_pixel_ratio();
   271         }
   272         emscripten_set_canvas_size(window->w * data->pixel_ratio, window->h * data->pixel_ratio);
   273 
   274         /*scale canvas down*/
   275         if (!data->external_size && data->pixel_ratio != 1.0f) {
   276             emscripten_set_element_css_size(NULL, window->w, window->h);
   277         }
   278     }
   279 }
   280 
   281 static void
   282 Emscripten_DestroyWindow(_THIS, SDL_Window * window)
   283 {
   284     SDL_WindowData *data;
   285 
   286     if(window->driverdata) {
   287         data = (SDL_WindowData *) window->driverdata;
   288 
   289         Emscripten_UnregisterEventHandlers(data);
   290 #if SDL_VIDEO_OPENGL_EGL
   291         if (data->egl_surface != EGL_NO_SURFACE) {
   292             SDL_EGL_DestroySurface(_this, data->egl_surface);
   293             data->egl_surface = EGL_NO_SURFACE;
   294         }
   295 #endif
   296         SDL_free(window->driverdata);
   297         window->driverdata = NULL;
   298     }
   299 }
   300 
   301 static void
   302 Emscripten_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen)
   303 {
   304     SDL_WindowData *data;
   305     if(window->driverdata) {
   306         data = (SDL_WindowData *) window->driverdata;
   307 
   308         if(fullscreen) {
   309             EmscriptenFullscreenStrategy strategy;
   310             SDL_bool is_desktop_fullscreen = (window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP;
   311             int res;
   312 
   313             strategy.scaleMode = is_desktop_fullscreen ? EMSCRIPTEN_FULLSCREEN_SCALE_STRETCH : EMSCRIPTEN_FULLSCREEN_SCALE_ASPECT;
   314 
   315             if(!is_desktop_fullscreen) {
   316                 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_NONE;
   317             } else if(window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
   318                 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_HIDEF;
   319             } else {
   320                 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_STDDEF;
   321             }
   322 
   323             strategy.filteringMode = EMSCRIPTEN_FULLSCREEN_FILTERING_DEFAULT;
   324 
   325             strategy.canvasResizedCallback = Emscripten_HandleCanvasResize;
   326             strategy.canvasResizedCallbackUserData = data;
   327 
   328             data->requested_fullscreen_mode = window->flags & (SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);
   329             data->fullscreen_resize = is_desktop_fullscreen;
   330 
   331             res = emscripten_request_fullscreen_strategy(NULL, 1, &strategy);
   332             if(res != EMSCRIPTEN_RESULT_SUCCESS && res != EMSCRIPTEN_RESULT_DEFERRED) {
   333                 /* unset flags, fullscreen failed */
   334                 window->flags &= ~(SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);
   335             }
   336         }
   337         else
   338             emscripten_exit_fullscreen();
   339     }
   340 }
   341 
   342 static void
   343 Emscripten_SetWindowTitle(_THIS, SDL_Window * window) {
   344     EM_ASM_INT({
   345       if (typeof Module['setWindowTitle'] !== 'undefined') {
   346         Module['setWindowTitle'](Module['Pointer_stringify']($0));
   347       }
   348       return 0;
   349     }, window->title);
   350 }
   351 
   352 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
   353 
   354 /* vi: set ts=4 sw=4 expandtab: */