glXGetCurrentReadDrawable — return the current drawable
GLXDrawable glXGetCurrentReadDrawable( | 
            glXGetCurrentReadDrawable returns the current read drawable,
            as specified by read parameter
            of glXMakeContextCurrent.
            If there is no current drawable,
            None is returned.
        
            glXGetCurrentReadDrawable returns client-side information.
            It does not make a round-trip to the server.
        
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