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

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• Hash : 0e45984f
  Author :
  Date : 2015-06-21T17:33:46
  

  Fixed crash if initialization of EGL failed but was tried again later. The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly uninitialized data structure if loading the library first failed. A later try to use EGL then skipped initialization and assumed it was previously successful because the data structure now already existed. This led to at least one crash in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was dereferenced to make a call to eglBindAPI().

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• src/video/x11/SDL_x11opengles.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2015 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_internal.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
          X11_GLES_UnloadLibrary(_this);
          _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;
  }
  
  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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