if( !glXQueryExtension( fgDisplay.pDisplay.Display, NULL, NULL ) )
fgError( "OpenGL GLX extension not supported by display '%s'",
XDisplayName( displayName ) );
if( !glXQueryExtension( fgDisplay.pDisplay.Display, NULL, NULL ) )
fgError( "OpenGL GLX extension not supported by display '%s'",
XDisplayName( displayName ) );