*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
extern GLXContext *init_GL (ModeInfo *);
extern void clear_gl_error (void);
extern void check_gl_error (const char *type);
extern GLXContext *init_GL (ModeInfo *);
extern void clear_gl_error (void);
extern void check_gl_error (const char *type);