OpenGL extension SGIX.shadow_ambient
This module customises the behaviour of the OpenGL.raw.GL.SGIX.shadow_ambient to provide a more Python-friendly API
Overview (from the spec)
This extension allows a value other than 0.0 to be returned by the SGIX_shadow operation in the case when the shadow test passes. With this extension any floating point value in the range [0.0, 1.0] can be returned as the texture value when an object is in shadow. This allows the (untextured) ambient lighting and direct shadowed lighting from a single light source to be computed in a single pass.
The official definition of this extension is available here: