+/* GLX 1.2 and later */
+extern Display *glXGetCurrentDisplay( void );
+
+
+/* GLX 1.3 and later */
+extern GLXFBConfig *glXChooseFBConfig( Display *dpy, int screen,
+ const int *attribList, int *nitems );
+
+extern int glXGetFBConfigAttrib( Display *dpy, GLXFBConfig config,
+ int attribute, int *value );
+
+extern GLXFBConfig *glXGetFBConfigs( Display *dpy, int screen,
+ int *nelements );
+
+extern XVisualInfo *glXGetVisualFromFBConfig( Display *dpy,
+ GLXFBConfig config );
+
+extern GLXWindow glXCreateWindow( Display *dpy, GLXFBConfig config,
+ Window win, const int *attribList );
+
+extern void glXDestroyWindow( Display *dpy, GLXWindow window );
+
+extern GLXPixmap glXCreatePixmap( Display *dpy, GLXFBConfig config,
+ Pixmap pixmap, const int *attribList );
+
+extern void glXDestroyPixmap( Display *dpy, GLXPixmap pixmap );
+
+extern GLXPbuffer glXCreatePbuffer( Display *dpy, GLXFBConfig config,
+ const int *attribList );
+
+extern void glXDestroyPbuffer( Display *dpy, GLXPbuffer pbuf );
+
+extern void glXQueryDrawable( Display *dpy, GLXDrawable draw, int attribute,
+ unsigned int *value );
+
+extern GLXContext glXCreateNewContext( Display *dpy, GLXFBConfig config,
+ int renderType, GLXContext shareList,
+ Bool direct );
+
+extern Bool glXMakeContextCurrent( Display *dpy, GLXDrawable draw,
+ GLXDrawable read, GLXContext ctx );
+
+extern GLXDrawable glXGetCurrentReadDrawable( void );
+
+extern int glXQueryContext( Display *dpy, GLXContext ctx, int attribute,
+ int *value );
+
+extern void glXSelectEvent( Display *dpy, GLXDrawable drawable,
+ unsigned long mask );
+
+extern void glXGetSelectedEvent( Display *dpy, GLXDrawable drawable,
+ unsigned long *mask );
+
+/* GLX 1.3 function pointer typedefs */
+typedef GLXFBConfig * (* PFNGLXGETFBCONFIGSPROC) (Display *dpy, int screen, int *nelements);
+typedef GLXFBConfig * (* PFNGLXCHOOSEFBCONFIGPROC) (Display *dpy, int screen, const int *attrib_list, int *nelements);
+typedef int (* PFNGLXGETFBCONFIGATTRIBPROC) (Display *dpy, GLXFBConfig config, int attribute, int *value);
+typedef XVisualInfo * (* PFNGLXGETVISUALFROMFBCONFIGPROC) (Display *dpy, GLXFBConfig config);
+typedef GLXWindow (* PFNGLXCREATEWINDOWPROC) (Display *dpy, GLXFBConfig config, Window win, const int *attrib_list);
+typedef void (* PFNGLXDESTROYWINDOWPROC) (Display *dpy, GLXWindow win);
+typedef GLXPixmap (* PFNGLXCREATEPIXMAPPROC) (Display *dpy, GLXFBConfig config, Pixmap pixmap, const int *attrib_list);
+typedef void (* PFNGLXDESTROYPIXMAPPROC) (Display *dpy, GLXPixmap pixmap);
+typedef GLXPbuffer (* PFNGLXCREATEPBUFFERPROC) (Display *dpy, GLXFBConfig config, const int *attrib_list);
+typedef void (* PFNGLXDESTROYPBUFFERPROC) (Display *dpy, GLXPbuffer pbuf);
+typedef void (* PFNGLXQUERYDRAWABLEPROC) (Display *dpy, GLXDrawable draw, int attribute, unsigned int *value);
+typedef GLXContext (* PFNGLXCREATENEWCONTEXTPROC) (Display *dpy, GLXFBConfig config, int render_type, GLXContext share_list, Bool direct);
+typedef Bool (* PFNGLXMAKECONTEXTCURRENTPROC) (Display *dpy, GLXDrawable draw, GLXDrawable read, GLXContext ctx);
+typedef GLXDrawable (* PFNGLXGETCURRENTREADDRAWABLEPROC) (void);
+typedef Display * (* PFNGLXGETCURRENTDISPLAYPROC) (void);
+typedef int (* PFNGLXQUERYCONTEXTPROC) (Display *dpy, GLXContext ctx, int attribute, int *value);
+typedef void (* PFNGLXSELECTEVENTPROC) (Display *dpy, GLXDrawable draw, unsigned long event_mask);
+typedef void (* PFNGLXGETSELECTEDEVENTPROC) (Display *dpy, GLXDrawable draw, unsigned long *event_mask);
+
+
+/*
+ * ARB 2. GLX_ARB_get_proc_address
+ */
+#ifndef GLX_ARB_get_proc_address
+#define GLX_ARB_get_proc_address 1
+
+typedef void (*__GLXextFuncPtr)(void);
+extern __GLXextFuncPtr glXGetProcAddressARB (const GLubyte *);
+
+#endif /* GLX_ARB_get_proc_address */
+
+
+
+/* GLX 1.4 and later */
+extern void (*glXGetProcAddress(const GLubyte *procname))( void );
+
+/* GLX 1.4 function pointer typedefs */
+typedef __GLXextFuncPtr (* PFNGLXGETPROCADDRESSPROC) (const GLubyte *procName);
+
+
+#ifndef GLX_GLXEXT_LEGACY