OpenGL extension SGIX.visual_select_group
This module customises the behaviour of the OpenGL.raw.GLX.SGIX.visual_select_group to provide a more Python-friendly API
Overview (from the spec)
This extension provides a mechanism to lower visual selection priorities that glXChooseVisual or glXChooseFBConfig defines. A new visual attribute is introduced, providing a way for servers to group visuals to different visual selection categories. The visual selection priorities of all the visuals in one category may be higher or lower than the ones in another category. The visual selection priorities in one category follow the rules of glXChooseVisual or glXChooseFBConfig. The new attribute is invisible to users so can't be queried by glXGetConfig or glXGetFBConfigAttrib.
The official definition of this extension is available here: