glXGetCurrentDrawable — return the current drawable
GLXDrawable glXGetCurrentDrawable( | 
            glXGetCurrentDrawable returns the current drawable,
            as specified by glXMakeCurrent.
            If there is no current drawable,
            None is returned.
        
            glXGetCurrentDrawable returns client-side information.
            It does not make a round trip to the server.
        
glXCreateGLXPixmap, glXGetCurrentContext, glXGetCurrentDisplay, glXGetCurrentReadDrawable, glXMakeCurrent
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