glXIsDirect — indicate whether direct rendering is enabled
Bool glXIsDirect( | Display * | dpy, | 
| GLXContext | ctx); | 
dpySpecifies the connection to the X server.
ctxSpecifies the GLX context that is being queried.
            glXIsDirect returns True if ctx is a direct rendering context,
            False otherwise.
            Direct rendering contexts pass rendering commands directly from the calling
            process's address space to the rendering system,
            bypassing the X server.
            Nondirect rendering contexts pass all rendering commands to the X server.
        
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