kc3-lang/SDL/src/video/x11/SDL_x11opengles.c

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• Hash : 35915d4f
  Author :
  Date : 2013-11-14T20:14:02
  

  Clean up the EGL related video backends (X11, Android, RPi)

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• src/video/x11/SDL_x11opengles.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "SDL_config.h"
  
  #if SDL_VIDEO_DRIVER_X11 && SDL_VIDEO_OPENGL_EGL
  
  #include "SDL_x11video.h"
  #include "SDL_x11opengles.h"
  #include "SDL_x11opengl.h"
  
  /* EGL implementation of SDL OpenGL support */
  
  int
  X11_GLES_LoadLibrary(_THIS, const char *path) {
          
      SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
  
      /* If the profile requested is not GL ES, switch over to X11_GL functions  */
      if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
          #if SDL_VIDEO_OPENGL_GLX
          _this->GL_LoadLibrary = X11_GL_LoadLibrary;
          _this->GL_GetProcAddress = X11_GL_GetProcAddress;
          _this->GL_UnloadLibrary = X11_GL_UnloadLibrary;
          _this->GL_CreateContext = X11_GL_CreateContext;
          _this->GL_MakeCurrent = X11_GL_MakeCurrent;
          _this->GL_SetSwapInterval = X11_GL_SetSwapInterval;
          _this->GL_GetSwapInterval = X11_GL_GetSwapInterval;
          _this->GL_SwapWindow = X11_GL_SwapWindow;
          _this->GL_DeleteContext = X11_GL_DeleteContext;
          return X11_GL_LoadLibrary(_this, path);
          #else
          return SDL_SetError("SDL not configured with OpenGL/GLX support");
          #endif
      }
      
      return SDL_EGL_LoadLibrary(_this, path, (NativeDisplayType) data->display);
  }
  
  XVisualInfo *
  X11_GLES_GetVisual(_THIS, Display * display, int screen)
  {
     
      XVisualInfo *egl_visualinfo = NULL;
      EGLint visual_id;
      XVisualInfo vi_in;
      int out_count;
  
      if (!_this->egl_data) {
          /* The EGL library wasn't loaded, SDL_GetError() should have info */
          return NULL;
      }
  
      if (_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display,
                                              _this->egl_data->egl_config,
                                              EGL_NATIVE_VISUAL_ID,
                                              &visual_id) == EGL_FALSE || !visual_id) {
          /* Use the default visual when all else fails */
          vi_in.screen = screen;
          egl_visualinfo = X11_XGetVisualInfo(display,
                                          VisualScreenMask,
                                          &vi_in, &out_count);
      } else {
          vi_in.screen = screen;
          vi_in.visualid = visual_id;
          egl_visualinfo = X11_XGetVisualInfo(display, VisualScreenMask | VisualIDMask, &vi_in, &out_count);
      }
  
      return egl_visualinfo;
  }
  
  SDL_GLContext
  X11_GLES_CreateContext(_THIS, SDL_Window * window)
  {
      SDL_GLContext context;
      SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
      Display *display = data->videodata->display;
  
      X11_XSync(display, False);
      context = SDL_EGL_CreateContext(_this, data->egl_surface);
      X11_XSync(display, False);
  
      return context;
  }
  
  void
  X11_GLES_DeleteContext(_THIS, SDL_GLContext context)
  {
      /* FIXME: This "crappy fix" comes from the previous GLES X11 code, 
       * it's required so you can create a GLX context, destroy it and create a EGL one 
       * To be able to fix this, we need to add a function SDL_GL_ResetContext and
       * disallow SDL_GL_MakeCurrent from taking a NULL pointer, thus ensuring we can
       * determine if it is a GLX or EGL context
       */
      SDL_EGL_DeleteContext(_this, context);
      X11_GLES_UnloadLibrary(_this);
  }
  
  SDL_EGL_SwapWindow_impl(X11)
  SDL_EGL_MakeCurrent_impl(X11)
  
  #endif /* SDL_VIDEO_DRIVER_X11 && SDL_VIDEO_OPENGL_EGL */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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