OpenGL extension EXT.texture_env_add
This module customises the behaviour of the OpenGL.raw.GL.EXT.texture_env_add to provide a more Python-friendly API
Overview (from the spec)
New texture environment function ADD is supported with the following equation: Cv = min(1, Cf + Ct)
New function may be specified by calling TexEnv with ADD token.
The official definition of this extension is available here: