OpenGL extension EXT.index_material
This module customises the behaviour of the OpenGL.raw.GL.EXT.index_material to provide a more Python-friendly API
Overview (from the spec)
This extends color index lighting to include a way for the current index to contribute to the color index produced by lighting. This works much like ColorMaterial does for RGBA lighting by allowing one or more color index material properties to be attached to the current index.
The color index lighting formula is also modified so that the lit color index may be bitwise shifted in order to allow greater control when using lighting and fog together in color index mode.
The official definition of this extension is available here:
Return boolean indicating whether this extension is available