src/video/emscripten/SDL_emscriptenopengles.c
author Manuel Alfayate Corchete
Sun, 17 Jan 2021 21:33:51 +0100
changeset 14743 c3b1b429b80b
parent 14640 b2b3343a310d
permissions -rw-r--r--
[KMS/DRM] Fix for bug #5468: corruption on dynamic cursor changing caused by wrong buffer size.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2021 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