/*+
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    SDL - Simple DirectMedia Layer+
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    Copyright (C) 1997-2004 Sam Lantinga+
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+
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    This library is free software; you can redistribute it and/or+
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    modify it under the terms of the GNU Library General Public+
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    License as published by the Free Software Foundation; either+
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    version 2 of the License, or (at your option) any later version.+
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+
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    This library is distributed in the hope that it will be useful,+
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    but WITHOUT ANY WARRANTY; without even the implied warranty of+
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU+
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    Library General Public License for more details.+
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+
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    You should have received a copy of the GNU Library General Public+
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    License along with this library; if not, write to the Free+
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA+
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+
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    Sam Lantinga+
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    slouken@libsdl.org+
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*/+
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+
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#ifdef SAVE_RCSID+
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static char rcsid =+
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 "@(#) $Id$";+
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#endif+
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+
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#ifdef HAVE_OPENGL+
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#include <GL/glx.h>+
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#include <dlfcn.h>+
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#if defined(__OpenBSD__) && !defined(__ELF__)+
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#define dlsym(x,y) dlsym(x, "_" y)+
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#endif+
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#endif+
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#include "SDL_sysvideo.h"+
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+
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struct SDL_PrivateGLData {+
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    int gl_active; /* to stop switching drivers while we have a valid context */+
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+
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#ifdef HAVE_OPENGL+
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    GLXContext glx_context;	/* Current GL context */+
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    XVisualInfo* glx_visualinfo; /* XVisualInfo* returned by glXChooseVisual */+
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+
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    void * (*glXGetProcAddress)(const GLubyte *procName);+
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+
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    XVisualInfo* (*glXChooseVisual)+
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		( Display*		dpy,+
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		  int			screen,+
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		  int*		attribList );+
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+
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    GLXContext (*glXCreateContext)+
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		( Display*		dpy,+
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		  XVisualInfo*	vis,+
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		  GLXContext		shareList,+
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		  Bool		direct );+
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+
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    void (*glXDestroyContext)+
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		( Display* 		dpy,+
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		  GLXContext		ctx );+
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+
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    Bool (*glXMakeCurrent)+
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		( Display*		dpy,+
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		  GLXDrawable		drawable,+
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		  GLXContext		ctx );+
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+
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    void (*glXSwapBuffers)+
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		( Display*		dpy,+
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		  GLXDrawable		drawable );+
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+
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    int (*glXGetConfig)+
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	 ( Display* dpy,+
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	   XVisualInfo* visual_info,+
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	   int attrib,+
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	   int* value );+
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+
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    void (*glXReleaseBuffersMESA)+
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	 ( Display* dpy,+
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	   GLXDrawable drawable );+
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+
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    const char *(*glXQueryExtensionsString)+
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	    ( Display* dpy,+
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	      int screen);+
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+
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    +
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#endif /* HAVE_OPENGL */+
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};+
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+
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/* Old variable names */+
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#define gl_active		(this->gl_data->gl_active)+
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#define glx_context		(this->gl_data->glx_context)+
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#define glx_visualinfo		(this->gl_data->glx_visualinfo)+
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+
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/* OpenGL functions */+
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extern XVisualInfo *X11_GL_GetVisual(_THIS);+
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extern int X11_GL_CreateWindow(_THIS, int w, int h);+
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extern int X11_GL_CreateContext(_THIS);+
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extern void X11_GL_Shutdown(_THIS);+
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#ifdef HAVE_OPENGL+
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extern int X11_GL_MakeCurrent(_THIS);+
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extern int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value);+
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extern void X11_GL_SwapBuffers(_THIS);+
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extern int X11_GL_LoadLibrary(_THIS, const char* path);+
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extern void *X11_GL_GetProcAddress(_THIS, const char* proc);+
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#endif+
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extern void X11_GL_UnloadLibrary(_THIS);+
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+
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