DESCRIPTION
       glXGetCurrentReadDrawable  returns  the current read drawable, as speci‐
       fied 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.

NOTES
       glXGetCurrentReadDrawable is only supported if the GLX version is 1.3 or
       greater.

SEE ALSO
       glXGetCurrentContext,    glXGetCurrentDisplay,    glXGetCurrentDrawable,
       glXMakeContextCurrent

                                                  GLXGETCURRENTREADDRAWABLE(3G)