OpenGL extension EXT.index_texture
This module customises the behaviour of the OpenGL.raw.GL.EXT.index_texture to provide a more Python-friendly API
Overview (from the spec)
This extends the definition of texturing so that it is supported in color index mode. This extension builds on the notion of texture images which have color index internal formats which was introduced in EXT_paletted_texture.
This extension also introduces a new texture environment function ADD which is useful for combining lighting and texturing in color index mode.
The official definition of this extension is available here:
Return boolean indicating whether this extension is available