kc3-lang/SDL/src/video/x11/SDL_x11opengl.h

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• Hash : 1e07dba0
  Author :
  Date : 2021-06-09T15:26:38
  

  x11: Use glXChooseFBConfig when available in X11_GL_GetVisual
  
  When choosing an X11 Visual for a window based on its GLX capabilities, first
  try glXChooseFBConfig (if available) before falling back to glXChooseVisual.
  This normally does not make a difference because most GLX drivers create a
  Visual for every GLXFBConfig, exposing all of the same capabilities.
  
  For GLX render offload configurations (also know as "PRIME") where one GPU is
  providing GLX rendering support for windows on an X screen running on a
  different GPU, the GPU doing the offloading needs to use the Visuals that were
  created by the host GPU's driver rather than being able to add its own. This
  means that there may be fewer Visuals available for all of the GLXFBConfigs the
  guest driver wants to expose. In order to handle that situation, the NVIDIA GLX
  driver creates many GLXFBConfigs that map to the same Visual when running in a
  render offload configuration.
  
  This can result in a glXChooseVisual request failing to find a supported Visual
  when there is a GLXFBConfig for that configuration that would have worked. For
  example, when the game "Unnamed SDVX Clone" [1] tries to create a configuration
  with multisample, glXChooseVisual fails because the Visual assigned to the
  multisample GLXFBConfigs is shared with the GLXFBConfigs without multisample.
  
  Avoid this problem by using glXChooseFBConfig, when available, to find a
  GLXFBConfig with the requested capabilities and then using
  glXGetVisualFromFBConfig to find the corresponding X11 Visual. This allows the
  game to run, although it doesn't make me any better at actually playing it...
  
  Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
  Fixes: https://forums.developer.nvidia.com/t/prime-run-cannot-create-window-x-glxcreatecontext/180214
  
  [1] https://github.com/Drewol/unnamed-sdvx-clone
  

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• src/video/x11/SDL_x11opengl.h

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2021 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"
  
  #ifndef SDL_x11opengl_h_
  #define SDL_x11opengl_h_
  
  #if SDL_VIDEO_OPENGL_GLX
  #include "SDL_opengl.h"
  #include <GL/glx.h>
  
  struct SDL_GLDriverData
  {
      int errorBase, eventBase;
  
      SDL_bool HAS_GLX_EXT_visual_rating;
      SDL_bool HAS_GLX_EXT_visual_info;
      SDL_bool HAS_GLX_EXT_swap_control_tear;
      SDL_bool HAS_GLX_ARB_context_flush_control;
      SDL_bool HAS_GLX_ARB_create_context_robustness;
      SDL_bool HAS_GLX_ARB_create_context_no_error;
  
      /* Max version of OpenGL ES context that can be created if the
         implementation supports GLX_EXT_create_context_es2_profile.
         major = minor = 0 when unsupported.
       */
      struct {
          int major;
          int minor;
      } es_profile_max_supported_version;
  
      Bool (*glXQueryExtension) (Display*,int*,int*);
      void *(*glXGetProcAddress) (const GLubyte*);
      XVisualInfo *(*glXChooseVisual) (Display*,int,int*);
      GLXContext (*glXCreateContext) (Display*,XVisualInfo*,GLXContext,Bool);
      GLXContext (*glXCreateContextAttribsARB) (Display*,GLXFBConfig,GLXContext,Bool,const int *);
      GLXFBConfig *(*glXChooseFBConfig) (Display*,int,const int *,int *);
      XVisualInfo *(*glXGetVisualFromFBConfig) (Display*,GLXFBConfig);
      void (*glXDestroyContext) (Display*, GLXContext);
      Bool(*glXMakeCurrent) (Display*,GLXDrawable,GLXContext);
      void (*glXSwapBuffers) (Display*, GLXDrawable);
      void (*glXQueryDrawable) (Display*,GLXDrawable,int,unsigned int*);
      void (*glXSwapIntervalEXT) (Display*,GLXDrawable,int);
      int (*glXSwapIntervalSGI) (int);
      int (*glXSwapIntervalMESA) (int);
      int (*glXGetSwapIntervalMESA) (void);
  };
  
  /* OpenGL functions */
  extern int X11_GL_LoadLibrary(_THIS, const char *path);
  extern void *X11_GL_GetProcAddress(_THIS, const char *proc);
  extern void X11_GL_UnloadLibrary(_THIS);
  extern SDL_bool X11_GL_UseEGL(_THIS);
  extern XVisualInfo *X11_GL_GetVisual(_THIS, Display * display, int screen);
  extern SDL_GLContext X11_GL_CreateContext(_THIS, SDL_Window * window);
  extern int X11_GL_MakeCurrent(_THIS, SDL_Window * window,
                                SDL_GLContext context);
  extern int X11_GL_SetSwapInterval(_THIS, int interval);
  extern int X11_GL_GetSwapInterval(_THIS);
  extern int X11_GL_SwapWindow(_THIS, SDL_Window * window);
  extern void X11_GL_DeleteContext(_THIS, SDL_GLContext context);
  
  #endif /* SDL_VIDEO_OPENGL_GLX */
  
  #endif /* SDL_x11opengl_h_ */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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