/*    SDL - Simple DirectMedia Layer    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga    This library is free software; you can redistribute it and/or    modify it under the terms of the GNU Library General Public    License as published by the Free Software Foundation; either    version 2 of the License, or (at your option) any later version.    This library is distributed in the hope that it will be useful,    but WITHOUT ANY WARRANTY; without even the implied warranty of    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU    Library General Public License for more details.    You should have received a copy of the GNU Library General Public    License along with this library; if not, write to the Free    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA    Sam Lantinga    slouken@libsdl.org*/#ifdef SAVE_RCSIDstatic char rcsid = "@(#) $Id: SDL_x11gl_c.h,v 1.5 2002/03/06 11:23:08 slouken Exp $";#endif#ifdef HAVE_OPENGL#include <GL/glx.h>#include <dlfcn.h>#if defined(__OpenBSD__) && !defined(__ELF__)#define dlsym(x,y) dlsym(x, "_" y)#endif#endif#include "SDL_sysvideo.h"struct SDL_PrivateGLData {    int gl_active; /* to stop switching drivers while we have a valid context */#ifdef HAVE_OPENGL    GLXContext glx_context;	/* Current GL context */    XVisualInfo* glx_visualinfo; /* XVisualInfo* returned by glXChooseVisual */    void * (*glXGetProcAddress)(const GLubyte *procName);    XVisualInfo* (*glXChooseVisual)		( Display*		dpy,		  int			screen,		  int*		attribList );    GLXContext (*glXCreateContext)		( Display*		dpy,		  XVisualInfo*	vis,		  GLXContext		shareList,		  Bool		direct );    void (*glXDestroyContext)		( Display* 		dpy,		  GLXContext		ctx );    Bool (*glXMakeCurrent)		( Display*		dpy,		  GLXDrawable		drawable,		  GLXContext		ctx );    void (*glXSwapBuffers)		( Display*		dpy,		  GLXDrawable		drawable );    int (*glXGetConfig)	 ( Display* dpy,	   XVisualInfo* visual_info,	   int attrib,	   int* value );    void (*glXReleaseBuffersMESA)	 ( Display* dpy,	   GLXDrawable drawable );#endif /* HAVE_OPENGL */};/* Old variable names */#define gl_active		(this->gl_data->gl_active)#define glx_context		(this->gl_data->glx_context)#define glx_visualinfo		(this->gl_data->glx_visualinfo)/* OpenGL functions */extern XVisualInfo *X11_GL_GetVisual(_THIS);extern int X11_GL_CreateWindow(_THIS, int w, int h);extern int X11_GL_CreateContext(_THIS);extern void X11_GL_Shutdown(_THIS);#ifdef HAVE_OPENGLextern int X11_GL_MakeCurrent(_THIS);extern int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value);extern void X11_GL_SwapBuffers(_THIS);extern int X11_GL_LoadLibrary(_THIS, const char* path);extern void *X11_GL_GetProcAddress(_THIS, const char* proc);#endifextern void X11_GL_UnloadLibrary(_THIS);