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FORK: Simple Directmedia Layer
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SDL_emscriptenopengles.c (3844B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 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 && SDL_VIDEO_OPENGL_EGL
     24 
     25 #include <emscripten/emscripten.h>
     26 #include <GLES2/gl2.h>
     27 
     28 #include "SDL_emscriptenvideo.h"
     29 #include "SDL_emscriptenopengles.h"
     30 #include "SDL_hints.h"
     31 
     32 #define LOAD_FUNC(NAME) _this->egl_data->NAME = NAME;
     33 
     34 /* EGL implementation of SDL OpenGL support */
     35 
     36 int
     37 Emscripten_GLES_LoadLibrary(_THIS, const char *path) {
     38     /*we can't load EGL dynamically*/
     39     _this->egl_data = (struct SDL_EGL_VideoData *) SDL_calloc(1, sizeof(SDL_EGL_VideoData));
     40     if (!_this->egl_data) {
     41         return SDL_OutOfMemory();
     42     }
     43 
     44     /* Emscripten forces you to manually cast eglGetProcAddress to the real
     45        function type; grep for "__eglMustCastToProperFunctionPointerType" in
     46        Emscripten's egl.h for details. */
     47     _this->egl_data->eglGetProcAddress = (void *(EGLAPIENTRY *)(const char *)) eglGetProcAddress;
     48 
     49     LOAD_FUNC(eglGetDisplay);
     50     LOAD_FUNC(eglInitialize);
     51     LOAD_FUNC(eglTerminate);
     52     LOAD_FUNC(eglChooseConfig);
     53     LOAD_FUNC(eglGetConfigAttrib);
     54     LOAD_FUNC(eglCreateContext);
     55     LOAD_FUNC(eglDestroyContext);
     56     LOAD_FUNC(eglCreateWindowSurface);
     57     LOAD_FUNC(eglDestroySurface);
     58     LOAD_FUNC(eglMakeCurrent);
     59     LOAD_FUNC(eglSwapBuffers);
     60     LOAD_FUNC(eglSwapInterval);
     61     LOAD_FUNC(eglWaitNative);
     62     LOAD_FUNC(eglWaitGL);
     63     LOAD_FUNC(eglBindAPI);
     64     LOAD_FUNC(eglQueryString);
     65     LOAD_FUNC(eglGetError);
     66 
     67     _this->egl_data->egl_display = _this->egl_data->eglGetDisplay(EGL_DEFAULT_DISPLAY);
     68     if (!_this->egl_data->egl_display) {
     69         return SDL_SetError("Could not get EGL display");
     70     }
     71     
     72     if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
     73         return SDL_SetError("Could not initialize EGL");
     74     }
     75 
     76     if (path) {
     77         SDL_strlcpy(_this->gl_config.driver_path, path, sizeof(_this->gl_config.driver_path) - 1);
     78     } else {
     79         *_this->gl_config.driver_path = '\0';
     80     }
     81     
     82     return 0;
     83 }
     84 
     85 SDL_EGL_CreateContext_impl(Emscripten)
     86 SDL_EGL_MakeCurrent_impl(Emscripten)
     87 
     88 int
     89 Emscripten_GLES_SwapWindow(_THIS, SDL_Window * window)
     90 {
     91     EGLBoolean ret = SDL_EGL_SwapBuffers(_this, ((SDL_WindowData *) window->driverdata)->egl_surface);
     92     if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, SDL_TRUE)) {
     93         /* give back control to browser for screen refresh */
     94         emscripten_sleep(0);
     95     }
     96     return ret;
     97 }
     98 
     99 void
    100 Emscripten_GLES_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
    101 {
    102     SDL_WindowData *data;
    103     if (window->driverdata) {
    104         data = (SDL_WindowData *) window->driverdata;
    105 
    106         if (w) {
    107             *w = window->w * data->pixel_ratio;
    108         }
    109 
    110         if (h) {
    111             *h = window->h * data->pixel_ratio;
    112         }
    113     }
    114 }
    115 
    116 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL */
    117 
    118 /* vi: set ts=4 sw=4 expandtab: */
    119