src/video/emscripten/SDL_emscriptenopengles.c
author Sam Lantinga
Sat, 02 Jan 2016 10:10:34 -0800
changeset 9998 f67cf37e9cd4
parent 9619 b94b6d0bff0f
child 10644 594c17c446f6
permissions -rw-r--r--
Updated copyright to 2016
     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 && 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     LOAD_FUNC(eglGetDisplay);
    44     LOAD_FUNC(eglInitialize);
    45     LOAD_FUNC(eglTerminate);
    46     LOAD_FUNC(eglGetProcAddress);
    47     LOAD_FUNC(eglChooseConfig);
    48     LOAD_FUNC(eglGetConfigAttrib);
    49     LOAD_FUNC(eglCreateContext);
    50     LOAD_FUNC(eglDestroyContext);
    51     LOAD_FUNC(eglCreateWindowSurface);
    52     LOAD_FUNC(eglDestroySurface);
    53     LOAD_FUNC(eglMakeCurrent);
    54     LOAD_FUNC(eglSwapBuffers);
    55     LOAD_FUNC(eglSwapInterval);
    56     LOAD_FUNC(eglWaitNative);
    57     LOAD_FUNC(eglWaitGL);
    58     LOAD_FUNC(eglBindAPI);
    59     
    60     _this->egl_data->egl_display = _this->egl_data->eglGetDisplay(EGL_DEFAULT_DISPLAY);
    61     if (!_this->egl_data->egl_display) {
    62         return SDL_SetError("Could not get EGL display");
    63     }
    64     
    65     if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
    66         return SDL_SetError("Could not initialize EGL");
    67     }
    68 
    69     _this->gl_config.driver_loaded = 1;
    70 
    71     if (path) {
    72         SDL_strlcpy(_this->gl_config.driver_path, path, sizeof(_this->gl_config.driver_path) - 1);
    73     } else {
    74         *_this->gl_config.driver_path = '\0';
    75     }
    76     
    77     return 0;
    78 }
    79 
    80 void
    81 Emscripten_GLES_DeleteContext(_THIS, SDL_GLContext context)
    82 {
    83     /*
    84     WebGL contexts can't actually be deleted, so we need to reset it.
    85     ES2 renderer resets state on init anyway, clearing the canvas should be enough
    86     */
    87 
    88     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
    89 
    90     SDL_EGL_DeleteContext(_this, context);
    91 }
    92 
    93 SDL_EGL_CreateContext_impl(Emscripten)
    94 SDL_EGL_SwapWindow_impl(Emscripten)
    95 SDL_EGL_MakeCurrent_impl(Emscripten)
    96 
    97 void
    98 Emscripten_GLES_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
    99 {
   100     SDL_WindowData *data;
   101     if (window->driverdata) {
   102         data = (SDL_WindowData *) window->driverdata;
   103 
   104         if (w) {
   105             *w = window->w * data->pixel_ratio;
   106         }
   107 
   108         if (h) {
   109             *h = window->h * data->pixel_ratio;
   110         }
   111     }
   112 }
   113 
   114 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL */
   115 
   116 /* vi: set ts=4 sw=4 expandtab: */
   117