src/video/emscripten/SDL_emscriptenopengles.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 01 Jan 2017 18:33:28 -0800
changeset 10737 3406a0f8b041
parent 10644 594c17c446f6
child 10741 a32fd6b7412b
permissions -rw-r--r--
Updated copyright for 2017
     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 && 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 
    31 #define LOAD_FUNC(NAME) _this->egl_data->NAME = NAME;
    32 
    33 /* EGL implementation of SDL OpenGL support */
    34 
    35 int
    36 Emscripten_GLES_LoadLibrary(_THIS, const char *path) {
    37     /*we can't load EGL dynamically*/
    38     _this->egl_data = (struct SDL_EGL_VideoData *) SDL_calloc(1, sizeof(SDL_EGL_VideoData));
    39     if (!_this->egl_data) {
    40         return SDL_OutOfMemory();
    41     }
    42 
    43     /* Emscripten forces you to manually cast eglGetProcAddress to the real
    44        function type; grep for "__eglMustCastToProperFunctionPointerType" in
    45        Emscripten's egl.h for details. */
    46     _this->egl_data->eglGetProcAddress = (void *(EGLAPIENTRY *)(const char *)) eglGetProcAddress;
    47 
    48     LOAD_FUNC(eglGetDisplay);
    49     LOAD_FUNC(eglInitialize);
    50     LOAD_FUNC(eglTerminate);
    51     LOAD_FUNC(eglChooseConfig);
    52     LOAD_FUNC(eglGetConfigAttrib);
    53     LOAD_FUNC(eglCreateContext);
    54     LOAD_FUNC(eglDestroyContext);
    55     LOAD_FUNC(eglCreateWindowSurface);
    56     LOAD_FUNC(eglDestroySurface);
    57     LOAD_FUNC(eglMakeCurrent);
    58     LOAD_FUNC(eglSwapBuffers);
    59     LOAD_FUNC(eglSwapInterval);
    60     LOAD_FUNC(eglWaitNative);
    61     LOAD_FUNC(eglWaitGL);
    62     LOAD_FUNC(eglBindAPI);
    63     
    64     _this->egl_data->egl_display = _this->egl_data->eglGetDisplay(EGL_DEFAULT_DISPLAY);
    65     if (!_this->egl_data->egl_display) {
    66         return SDL_SetError("Could not get EGL display");
    67     }
    68     
    69     if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
    70         return SDL_SetError("Could not initialize EGL");
    71     }
    72 
    73     _this->gl_config.driver_loaded = 1;
    74 
    75     if (path) {
    76         SDL_strlcpy(_this->gl_config.driver_path, path, sizeof(_this->gl_config.driver_path) - 1);
    77     } else {
    78         *_this->gl_config.driver_path = '\0';
    79     }
    80     
    81     return 0;
    82 }
    83 
    84 void
    85 Emscripten_GLES_DeleteContext(_THIS, SDL_GLContext context)
    86 {
    87     /*
    88     WebGL contexts can't actually be deleted, so we need to reset it.
    89     ES2 renderer resets state on init anyway, clearing the canvas should be enough
    90     */
    91 
    92     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
    93 
    94     SDL_EGL_DeleteContext(_this, context);
    95 }
    96 
    97 SDL_EGL_CreateContext_impl(Emscripten)
    98 SDL_EGL_SwapWindow_impl(Emscripten)
    99 SDL_EGL_MakeCurrent_impl(Emscripten)
   100 
   101 void
   102 Emscripten_GLES_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
   103 {
   104     SDL_WindowData *data;
   105     if (window->driverdata) {
   106         data = (SDL_WindowData *) window->driverdata;
   107 
   108         if (w) {
   109             *w = window->w * data->pixel_ratio;
   110         }
   111 
   112         if (h) {
   113             *h = window->h * data->pixel_ratio;
   114         }
   115     }
   116 }
   117 
   118 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL */
   119 
   120 /* vi: set ts=4 sw=4 expandtab: */
   121