src/video/emscripten/SDL_emscriptenvideo.c
author Sam Lantinga
Tue, 13 Sep 2016 00:03:28 -0700
changeset 10317 4a45690d5d82
parent 9998 f67cf37e9cd4
child 10331 710c2ae96681
permissions -rw-r--r--
simplify fullscreen handling using new fullscreen_strategy api, patch contributed by Charlie Birks
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2016 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_sysvideo.h"
    28 #include "../SDL_pixels_c.h"
    29 #include "../SDL_egl_c.h"
    30 #include "../../events/SDL_events_c.h"
    31 
    32 #include "SDL_emscriptenvideo.h"
    33 #include "SDL_emscriptenopengles.h"
    34 #include "SDL_emscriptenframebuffer.h"
    35 #include "SDL_emscriptenevents.h"
    36 #include "SDL_emscriptenmouse.h"
    37 
    38 #define EMSCRIPTENVID_DRIVER_NAME "emscripten"
    39 
    40 /* Initialization/Query functions */
    41 static int Emscripten_VideoInit(_THIS);
    42 static int Emscripten_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
    43 static void Emscripten_VideoQuit(_THIS);
    44 
    45 static int Emscripten_CreateWindow(_THIS, SDL_Window * window);
    46 static void Emscripten_SetWindowSize(_THIS, SDL_Window * window);
    47 static void Emscripten_DestroyWindow(_THIS, SDL_Window * window);
    48 static void Emscripten_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen);
    49 static void Emscripten_PumpEvents(_THIS);
    50 
    51 
    52 /* Emscripten driver bootstrap functions */
    53 
    54 static int
    55 Emscripten_Available(void)
    56 {
    57     return (1);
    58 }
    59 
    60 static void
    61 Emscripten_DeleteDevice(SDL_VideoDevice * device)
    62 {
    63     SDL_free(device);
    64 }
    65 
    66 static SDL_VideoDevice *
    67 Emscripten_CreateDevice(int devindex)
    68 {
    69     SDL_VideoDevice *device;
    70 
    71     /* Initialize all variables that we clean on shutdown */
    72     device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
    73     if (!device) {
    74         SDL_OutOfMemory();
    75         return (0);
    76     }
    77 
    78     /* Set the function pointers */
    79     device->VideoInit = Emscripten_VideoInit;
    80     device->VideoQuit = Emscripten_VideoQuit;
    81     device->SetDisplayMode = Emscripten_SetDisplayMode;
    82 
    83 
    84     device->PumpEvents = Emscripten_PumpEvents;
    85 
    86     device->CreateWindow = Emscripten_CreateWindow;
    87     /*device->CreateWindowFrom = Emscripten_CreateWindowFrom;
    88     device->SetWindowTitle = Emscripten_SetWindowTitle;
    89     device->SetWindowIcon = Emscripten_SetWindowIcon;
    90     device->SetWindowPosition = Emscripten_SetWindowPosition;*/
    91     device->SetWindowSize = Emscripten_SetWindowSize;
    92     /*device->ShowWindow = Emscripten_ShowWindow;
    93     device->HideWindow = Emscripten_HideWindow;
    94     device->RaiseWindow = Emscripten_RaiseWindow;
    95     device->MaximizeWindow = Emscripten_MaximizeWindow;
    96     device->MinimizeWindow = Emscripten_MinimizeWindow;
    97     device->RestoreWindow = Emscripten_RestoreWindow;
    98     device->SetWindowGrab = Emscripten_SetWindowGrab;*/
    99     device->DestroyWindow = Emscripten_DestroyWindow;
   100     device->SetWindowFullscreen = Emscripten_SetWindowFullscreen;
   101 
   102     device->CreateWindowFramebuffer = Emscripten_CreateWindowFramebuffer;
   103     device->UpdateWindowFramebuffer = Emscripten_UpdateWindowFramebuffer;
   104     device->DestroyWindowFramebuffer = Emscripten_DestroyWindowFramebuffer;
   105 
   106     device->GL_LoadLibrary = Emscripten_GLES_LoadLibrary;
   107     device->GL_GetProcAddress = Emscripten_GLES_GetProcAddress;
   108     device->GL_UnloadLibrary = Emscripten_GLES_UnloadLibrary;
   109     device->GL_CreateContext = Emscripten_GLES_CreateContext;
   110     device->GL_MakeCurrent = Emscripten_GLES_MakeCurrent;
   111     device->GL_SetSwapInterval = Emscripten_GLES_SetSwapInterval;
   112     device->GL_GetSwapInterval = Emscripten_GLES_GetSwapInterval;
   113     device->GL_SwapWindow = Emscripten_GLES_SwapWindow;
   114     device->GL_DeleteContext = Emscripten_GLES_DeleteContext;
   115     device->GL_GetDrawableSize = Emscripten_GLES_GetDrawableSize;
   116 
   117     device->free = Emscripten_DeleteDevice;
   118 
   119     return device;
   120 }
   121 
   122 VideoBootStrap Emscripten_bootstrap = {
   123     EMSCRIPTENVID_DRIVER_NAME, "SDL emscripten video driver",
   124     Emscripten_Available, Emscripten_CreateDevice
   125 };
   126 
   127 
   128 int
   129 Emscripten_VideoInit(_THIS)
   130 {
   131     SDL_DisplayMode mode;
   132     double css_w, css_h;
   133 
   134     /* Use a fake 32-bpp desktop mode */
   135     mode.format = SDL_PIXELFORMAT_RGB888;
   136 
   137     emscripten_get_element_css_size(NULL, &css_w, &css_h);
   138 
   139     mode.w = css_w;
   140     mode.h = css_h;
   141 
   142     mode.refresh_rate = 0;
   143     mode.driverdata = NULL;
   144     if (SDL_AddBasicVideoDisplay(&mode) < 0) {
   145         return -1;
   146     }
   147 
   148     SDL_zero(mode);
   149     SDL_AddDisplayMode(&_this->displays[0], &mode);
   150 
   151     Emscripten_InitMouse();
   152 
   153     /* We're done! */
   154     return 0;
   155 }
   156 
   157 static int
   158 Emscripten_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
   159 {
   160     /* can't do this */
   161     return 0;
   162 }
   163 
   164 static void
   165 Emscripten_VideoQuit(_THIS)
   166 {
   167     Emscripten_FiniMouse();
   168 }
   169 
   170 static void
   171 Emscripten_PumpEvents(_THIS)
   172 {
   173     /* do nothing. */
   174 }
   175 
   176 static int
   177 Emscripten_CreateWindow(_THIS, SDL_Window * window)
   178 {
   179     SDL_WindowData *wdata;
   180     double scaled_w, scaled_h;
   181     double css_w, css_h;
   182 
   183     /* Allocate window internal data */
   184     wdata = (SDL_WindowData *) SDL_calloc(1, sizeof(SDL_WindowData));
   185     if (wdata == NULL) {
   186         return SDL_OutOfMemory();
   187     }
   188 
   189     if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
   190         wdata->pixel_ratio = emscripten_get_device_pixel_ratio();
   191     } else {
   192         wdata->pixel_ratio = 1.0f;
   193     }
   194 
   195     scaled_w = SDL_floor(window->w * wdata->pixel_ratio);
   196     scaled_h = SDL_floor(window->h * wdata->pixel_ratio);
   197 
   198     emscripten_set_canvas_size(scaled_w, scaled_h);
   199 
   200     emscripten_get_element_css_size(NULL, &css_w, &css_h);
   201 
   202     wdata->external_size = css_w != scaled_w || css_h != scaled_h;
   203 
   204     if ((window->flags & SDL_WINDOW_RESIZABLE) && wdata->external_size) {
   205         /* external css has resized us */
   206         scaled_w = css_w * wdata->pixel_ratio;
   207         scaled_h = css_h * wdata->pixel_ratio;
   208 
   209         emscripten_set_canvas_size(scaled_w, scaled_h);
   210         SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESIZED, css_w, css_h);
   211     }
   212 
   213     /* if the size is not being controlled by css, we need to scale down for hidpi */
   214     if (!wdata->external_size) {
   215         if (wdata->pixel_ratio != 1.0f) {
   216             /*scale canvas down*/
   217             emscripten_set_element_css_size(NULL, window->w, window->h);
   218         }
   219     }
   220 
   221     if (window->flags & SDL_WINDOW_OPENGL) {
   222         if (!_this->egl_data) {
   223             if (SDL_GL_LoadLibrary(NULL) < 0) {
   224                 return -1;
   225             }
   226         }
   227         wdata->egl_surface = SDL_EGL_CreateSurface(_this, 0);
   228 
   229         if (wdata->egl_surface == EGL_NO_SURFACE) {
   230             return SDL_SetError("Could not create GLES window surface");
   231         }
   232     }
   233 
   234     wdata->window = window;
   235 
   236     /* Setup driver data for this window */
   237     window->driverdata = wdata;
   238 
   239     /* One window, it always has focus */
   240     SDL_SetMouseFocus(window);
   241     SDL_SetKeyboardFocus(window);
   242 
   243     Emscripten_RegisterEventHandlers(wdata);
   244 
   245     /* Window has been successfully created */
   246     return 0;
   247 }
   248 
   249 static void Emscripten_SetWindowSize(_THIS, SDL_Window * window)
   250 {
   251     SDL_WindowData *data;
   252 
   253     if (window->driverdata) {
   254         data = (SDL_WindowData *) window->driverdata;
   255         emscripten_set_canvas_size(window->w * data->pixel_ratio, window->h * data->pixel_ratio);
   256 
   257         /*scale canvas down*/
   258         if (!data->external_size && data->pixel_ratio != 1.0f) {
   259             emscripten_set_element_css_size(NULL, window->w, window->h);
   260         }
   261     }
   262 }
   263 
   264 static void
   265 Emscripten_DestroyWindow(_THIS, SDL_Window * window)
   266 {
   267     SDL_WindowData *data;
   268 
   269     if(window->driverdata) {
   270         data = (SDL_WindowData *) window->driverdata;
   271 
   272         Emscripten_UnregisterEventHandlers(data);
   273         if (data->egl_surface != EGL_NO_SURFACE) {
   274             SDL_EGL_DestroySurface(_this, data->egl_surface);
   275             data->egl_surface = EGL_NO_SURFACE;
   276         }
   277         SDL_free(window->driverdata);
   278         window->driverdata = NULL;
   279     }
   280 }
   281 
   282 static void
   283 Emscripten_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen)
   284 {
   285     SDL_WindowData *data;
   286     if(window->driverdata) {
   287         data = (SDL_WindowData *) window->driverdata;
   288 
   289         if(fullscreen) {
   290             EmscriptenFullscreenStrategy strategy;
   291             SDL_bool is_desktop_fullscreen = (window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP;
   292 
   293             strategy.scaleMode = is_desktop_fullscreen ? EMSCRIPTEN_FULLSCREEN_SCALE_STRETCH : EMSCRIPTEN_FULLSCREEN_SCALE_ASPECT;
   294 
   295             if(!is_desktop_fullscreen) {
   296                 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_NONE;
   297             } else if(window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
   298                 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_HIDEF;
   299             } else {
   300                 strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_STDDEF;
   301             }
   302 
   303             strategy.filteringMode = EMSCRIPTEN_FULLSCREEN_FILTERING_DEFAULT;
   304 
   305             strategy.canvasResizedCallback = Emscripten_HandleCanvasResize;
   306             strategy.canvasResizedCallbackUserData = data;
   307 
   308             data->requested_fullscreen_mode = window->flags & (SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);
   309             data->fullscreen_resize = is_desktop_fullscreen;
   310             /*unset the fullscreen flags as we're not actually fullscreen yet*/
   311             window->flags &= ~(SDL_WINDOW_FULLSCREEN_DESKTOP | SDL_WINDOW_FULLSCREEN);
   312 
   313             emscripten_request_fullscreen_strategy(NULL, 1, &strategy);
   314         }
   315         else
   316             emscripten_exit_fullscreen();
   317     }
   318 }
   319 
   320 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN */
   321 
   322 /* vi: set ts=4 sw=4 expandtab: */