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      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2012 Sam Lantinga
      4 
      5     This library is free software; you can redistribute it and/or
      6     modify it under the terms of the GNU Lesser General Public
      7     License as published by the Free Software Foundation; either
      8     version 2.1 of the License, or (at your option) any later version.
      9 
     10     This library is distributed in the hope that it will be useful,
     11     but WITHOUT ANY WARRANTY; without even the implied warranty of
     12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13     Lesser General Public License for more details.
     14 
     15     You should have received a copy of the GNU Lesser General Public
     16     License along with this library; if not, write to the Free Software
     17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     18 
     19     Sam Lantinga
     20     slouken (at) libsdl.org
     21 */
     22 #include "SDL_config.h"
     23 
     24 #if SDL_VIDEO_OPENGL_GLX
     25 #include <GL/glx.h>
     26 #include "SDL_loadso.h"
     27 #endif
     28 
     29 #include "../SDL_sysvideo.h"
     30 
     31 struct SDL_PrivateGLData {
     32     int gl_active; /* to stop switching drivers while we have a valid context */
     33 
     34 #if SDL_VIDEO_OPENGL_GLX
     35     GLXContext glx_context;	/* Current GL context */
     36     XVisualInfo* glx_visualinfo; /* XVisualInfo* returned by glXChooseVisual */
     37 
     38     void * (*glXGetProcAddress)(const GLubyte *procName);
     39 
     40     XVisualInfo* (*glXChooseVisual)
     41 		( Display*		dpy,
     42 		  int			screen,
     43 		  int*			attribList );
     44 
     45     GLXContext (*glXCreateContext)
     46 		( Display*		dpy,
     47 		  XVisualInfo*		vis,
     48 		  GLXContext		shareList,
     49 		  Bool			direct );
     50 
     51     void (*glXDestroyContext)
     52 		( Display* 		dpy,
     53 		  GLXContext		ctx );
     54 
     55     Bool (*glXMakeCurrent)
     56 		( Display*		dpy,
     57 		  GLXDrawable		drawable,
     58 		  GLXContext		ctx );
     59 
     60     void (*glXSwapBuffers)
     61 		( Display*		dpy,
     62 		  GLXDrawable		drawable );
     63 
     64     int (*glXGetConfig)
     65 	 ( Display* dpy,
     66 	   XVisualInfo* visual_info,
     67 	   int attrib,
     68 	   int* value );
     69 
     70     const char *(*glXQueryExtensionsString)
     71 	    ( Display* dpy,
     72 	      int screen );
     73 
     74     int (*glXSwapIntervalSGI) ( int interval );
     75     GLint (*glXSwapIntervalMESA) ( unsigned interval );
     76     int (*glXSwapIntervalEXT)( Display *dpy, GLXDrawable drw, int interval);
     77     int swap_interval;
     78 #endif /* SDL_VIDEO_OPENGL_GLX */
     79 };
     80 
     81 /* Old variable names */
     82 #define gl_active		(this->gl_data->gl_active)
     83 #define glx_context		(this->gl_data->glx_context)
     84 #define glx_visualinfo		(this->gl_data->glx_visualinfo)
     85 
     86 /* OpenGL functions */
     87 extern XVisualInfo *X11_GL_GetVisual(_THIS);
     88 extern int X11_GL_CreateWindow(_THIS, int w, int h);
     89 extern int X11_GL_CreateContext(_THIS);
     90 extern void X11_GL_Shutdown(_THIS);
     91 #if SDL_VIDEO_OPENGL_GLX
     92 extern int X11_GL_MakeCurrent(_THIS);
     93 extern int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value);
     94 extern void X11_GL_SwapBuffers(_THIS);
     95 extern int X11_GL_LoadLibrary(_THIS, const char* path);
     96 extern void *X11_GL_GetProcAddress(_THIS, const char* proc);
     97 #endif
     98 extern void X11_GL_UnloadLibrary(_THIS);
     99 
    100