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  SSK7  SSKJr  S rg)	a  OpenGL extension ARB.texture_env_combine

This module customises the behaviour of the 
OpenGL.raw.GL.ARB.texture_env_combine to provide a more 
Python-friendly API

Overview (from the spec)
        
        New texture environment function COMBINE_ARB allows programmable
        texture combiner operations, including:
        
            REPLACE                 Arg0
            MODULATE                Arg0 * Arg1
            ADD                     Arg0 + Arg1
            ADD_SIGNED_ARB          Arg0 + Arg1 - 0.5
            SUBTRACT_ARB            Arg0 - Arg1
            INTERPOLATE_ARB         Arg0 * (Arg2) + Arg1 * (1-Arg2)
        
        where Arg0, Arg1 and Arg2 are derived from
        
            PRIMARY_COLOR_ARB       primary color of incoming fragment
            TEXTURE                 texture color of corresponding texture unit
            CONSTANT_ARB            texture environment constant color
            PREVIOUS_ARB            result of previous texture environment; on
                                    texture unit 0, this maps to PRIMARY_COLOR_ARB
        
        In addition, the result may be scaled by 1.0, 2.0 or 4.0.

The official definition of this extension is available here:
http://www.opengl.org/registry/specs/ARB/texture_env_combine.txt
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