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

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

Overview (from the spec)
        
        This extension extends ARB_fragment_program to remove
        the interaction with ARB_shadow.
        
        This extension defines the program option
        "ARB_fragment_program_shadow".
        
        If a fragment program specifies the option "ARB_fragment_program_shadow"
        
            SHADOW1D, SHADOW2D, SHADOWRECT
        
        are added as texture targets.  When shadow map comparisons are
        desired, specify the SHADOW1D, SHADOW2D, or SHADOWRECT texture
        targets in texture instructions.
        
        Programs must assure that the comparison mode for each depth
        texture (TEXTURE_COMPARE_MODE) and/or the internal texture
        format (DEPTH_COMPONENT) and the targets of the texture lookup
        instructions match.  Otherwise, if the comparison mode
        and/or the internal texture format are inconsistent with the
        texture target, the results of the texture lookup are undefined.

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