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NAME
     glXGetCurrentReadDrawableSGI - return the  current  drawable
     being used as a pixel query source

C SPECIFICATION
     GLXDrawable glXGetCurrentReadDrawableSGI( void )

DESCRIPTION
     glXGetCurrentReadDrawableSGI  returns  the   name   of   the
     GLXDrawable  currently  being  used as a pixel query source.
     If glXMakeCurrent specified the current  rendering  context,
     then   glXGetCurrentReadDrawableSGI   returns  the  drawable
     specified  as  drawable  by  that  glXMakeCurrent  call.  If
     glXMakeCurrentReadSGI  specified  the current rendering con-
     text, then glXGetCurrentReadDrawableSGI returns the drawable
     specified  as  readable  by that glXMakeCurrentReadSGI call.
     If there is no current read drawable, None is returned.

     glXGetCurrentReadDrawableSGI returns  client-side   informa-
     tion.   It does not make a round trip to the server.

SEE ALSO
     glXCreateGLXPixmap, glXMakeCurrent, glXMakeCurrentReadSGI

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