OpenGL extension WIN.phong_shading
This module customises the behaviour of the OpenGL.raw.GL.WIN.phong_shading to provide a more Python-friendly API
Overview (from the spec)
WIN_phong_shading enables rendering Phong shaded primitives using OpenGL. Phong shading is a well known shading technique documented in most graphics texts.
As opposed to Gouraud (or smooth) shading, which simply calculates the normals at the vertices and then interpolates the colors of the pixels, Phong shading involves interpolating an individual normal for every pixel, and then applying the shading model to each pixel based on its normal component.
While Phong shading requires substantially more computation than does Gouraud shading, the resulting images are more realistic, especially if the primitives are large.
The official definition of this extension is available here:
Return boolean indicating whether this extension is available