src/video/emscripten/SDL_emscriptenopengles.c
author Charlie Birks <charlie@daftgames.net>
Tue, 29 Jan 2019 12:19:32 +0000
changeset 12579 8dc4e45fbe2b
parent 12503 806492103856
permissions -rw-r--r--
Emscripten: remove GLES_DeleteContext implementation
It was calling glClear without a context. The issue it was trying to
solve was actually that after destroying a window and creating a new one
, the contents of the old window were preserved. This no longer happens
since we resize the window to nothing on destroy.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2019 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     LOAD_FUNC(eglQueryString);
    64     LOAD_FUNC(eglGetError);
    65 
    66     _this->egl_data->egl_display = _this->egl_data->eglGetDisplay(EGL_DEFAULT_DISPLAY);
    67     if (!_this->egl_data->egl_display) {
    68         return SDL_SetError("Could not get EGL display");
    69     }
    70     
    71     if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
    72         return SDL_SetError("Could not initialize EGL");
    73     }
    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 SDL_EGL_CreateContext_impl(Emscripten)
    85 SDL_EGL_SwapWindow_impl(Emscripten)
    86 SDL_EGL_MakeCurrent_impl(Emscripten)
    87 
    88 void
    89 Emscripten_GLES_GetDrawableSize(_THIS, SDL_Window * window, int * w, int * h)
    90 {
    91     SDL_WindowData *data;
    92     if (window->driverdata) {
    93         data = (SDL_WindowData *) window->driverdata;
    94 
    95         if (w) {
    96             *w = window->w * data->pixel_ratio;
    97         }
    98 
    99         if (h) {
   100             *h = window->h * data->pixel_ratio;
   101         }
   102     }
   103 }
   104 
   105 #endif /* SDL_VIDEO_DRIVER_EMSCRIPTEN && SDL_VIDEO_OPENGL_EGL */
   106 
   107 /* vi: set ts=4 sw=4 expandtab: */
   108