OpenGL extension ARB.texture_env_add
This module customises the behaviour of the OpenGL.raw.GL.ARB.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.
One possible application is to add a specular highlight texture to a Gouraud-shaded primitive to emulate Phong shading, in a single pass.
The official definition of this extension is available here:
Return boolean indicating whether this extension is available