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FORK: Simple Directmedia Layer
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SDL_windowsopengles.c (4541B)

      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_WINDOWS && SDL_VIDEO_OPENGL_EGL
     24 
     25 #include "SDL_windowsvideo.h"
     26 #include "SDL_windowsopengles.h"
     27 #include "SDL_windowsopengl.h"
     28 
     29 /* EGL implementation of SDL OpenGL support */
     30 
     31 int
     32 WIN_GLES_LoadLibrary(_THIS, const char *path) {
     33 
     34     /* If the profile requested is not GL ES, switch over to WIN_GL functions  */
     35     if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
     36 #if SDL_VIDEO_OPENGL_WGL
     37         WIN_GLES_UnloadLibrary(_this);
     38         _this->GL_LoadLibrary = WIN_GL_LoadLibrary;
     39         _this->GL_GetProcAddress = WIN_GL_GetProcAddress;
     40         _this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
     41         _this->GL_CreateContext = WIN_GL_CreateContext;
     42         _this->GL_MakeCurrent = WIN_GL_MakeCurrent;
     43         _this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
     44         _this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
     45         _this->GL_SwapWindow = WIN_GL_SwapWindow;
     46         _this->GL_DeleteContext = WIN_GL_DeleteContext;
     47         return WIN_GL_LoadLibrary(_this, path);
     48 #else
     49         return SDL_SetError("SDL not configured with OpenGL/WGL support");
     50 #endif
     51     }
     52     
     53     if (_this->egl_data == NULL) {
     54         return SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY, 0);
     55     }
     56 
     57     return 0;
     58 }
     59 
     60 SDL_GLContext
     61 WIN_GLES_CreateContext(_THIS, SDL_Window * window)
     62 {
     63     SDL_GLContext context;
     64     SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
     65 
     66 #if SDL_VIDEO_OPENGL_WGL
     67     if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
     68         /* Switch to WGL based functions */
     69         WIN_GLES_UnloadLibrary(_this);
     70         _this->GL_LoadLibrary = WIN_GL_LoadLibrary;
     71         _this->GL_GetProcAddress = WIN_GL_GetProcAddress;
     72         _this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
     73         _this->GL_CreateContext = WIN_GL_CreateContext;
     74         _this->GL_MakeCurrent = WIN_GL_MakeCurrent;
     75         _this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
     76         _this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
     77         _this->GL_SwapWindow = WIN_GL_SwapWindow;
     78         _this->GL_DeleteContext = WIN_GL_DeleteContext;
     79 
     80         if (WIN_GL_LoadLibrary(_this, NULL) != 0) {
     81             return NULL;
     82         }
     83 
     84         return WIN_GL_CreateContext(_this, window);
     85     }
     86 #endif
     87 
     88     context = SDL_EGL_CreateContext(_this, data->egl_surface);
     89     return context;
     90 }
     91 
     92 void
     93 WIN_GLES_DeleteContext(_THIS, SDL_GLContext context)
     94 {
     95     SDL_EGL_DeleteContext(_this, context);
     96     WIN_GLES_UnloadLibrary(_this);
     97 }
     98 
     99 SDL_EGL_SwapWindow_impl(WIN)
    100 SDL_EGL_MakeCurrent_impl(WIN)
    101 
    102 int
    103 WIN_GLES_SetupWindow(_THIS, SDL_Window * window)
    104 {
    105     /* The current context is lost in here; save it and reset it. */
    106     SDL_WindowData *windowdata = (SDL_WindowData *) window->driverdata;
    107     SDL_Window *current_win = SDL_GL_GetCurrentWindow();
    108     SDL_GLContext current_ctx = SDL_GL_GetCurrentContext();
    109 
    110     if (_this->egl_data == NULL) {
    111         SDL_assert(!_this->gl_config.driver_loaded);
    112         if (SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY, 0) < 0) {
    113             SDL_EGL_UnloadLibrary(_this);
    114             return -1;
    115         }
    116         _this->gl_config.driver_loaded = 1;
    117     }
    118   
    119     /* Create the GLES window surface */
    120     windowdata->egl_surface = SDL_EGL_CreateSurface(_this, (NativeWindowType)windowdata->hwnd);
    121 
    122     if (windowdata->egl_surface == EGL_NO_SURFACE) {
    123         return SDL_SetError("Could not create GLES window surface");
    124     }
    125 
    126     return WIN_GLES_MakeCurrent(_this, current_win, current_ctx);    
    127 }
    128 
    129 #endif /* SDL_VIDEO_DRIVER_WINDOWS && SDL_VIDEO_OPENGL_EGL */
    130 
    131 /* vi: set ts=4 sw=4 expandtab: */