OpenGL extension EXT.visual_rating
This module customises the behaviour of the OpenGL.raw.GLX.EXT.visual_rating to provide a more Python-friendly API
Overview (from the spec)
This extension allows servers to identify a particular GLX visual as undesirable. A new visual attribute is introduced, providing a way for servers to specify caveats (e.g., slow) for a visual. The attribute may be queried using glXGetConfig, and can therefore be used by application-specific visual selection routines. The new attribute is also used by glXChooseVisual to discriminate against visuals with caveats.
This extension allows servers to export visuals with improved features or image quality, but lower performance or greater system burden, without having to have these visuals selected preferentially. It is intended to insure that most applications get the "right" visual, not that all applications do.
The official definition of this extension is available here:
Return boolean indicating whether this extension is available