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  SSK7  SSKJr  S rg)	aÆ  OpenGL extension EXT.pvrtc_sRGB

This module customises the behaviour of the 
OpenGL.raw.GLES2.EXT.pvrtc_sRGB to provide a more 
Python-friendly API

Overview (from the spec)
        
        The response from electronic display systems given RGB tristimulus values 
        for each pixel is non-linear.  Gamma correction is the process of encoding 
        or decoding images in a manner that will correct for non-linear response 
        profiles of output devices.  The displayed results of gamma-corrected pixel 
        data are more consistent and predictable for the author of such pixel data 
        than it would otherwise be with linearly encoded pixel data.
        
        This EXT_pvrtc_sRGB extension specifies additional tokens for gamma 
        corrected PVRTC compressed sRGB data.  
        
        Texture assets are developed and evaluated for use in OpenGL applications 
        using electronic displays with non-linear responses.  This extension 
        provides a better measure of consistency between textures developed within 
        an asset toolchain and their final rendered result with an OpenGL 
        application that uses those textures.
        
        Conventional OpenGL texture tristimulus values as well as their alpha 
        component are encoded linearly.  The textures introduced by this extension 
        are encoded with gamma correction in the tristimulus components but 
        linearly in the alpha component.
        
        When gamma corrected texture samples are fetched and operated on by ALU 
        operations in an OpenGL shading program those samples will be converted 
        from gamma corrected space to linear space for logical simplicity and 
        performance of the shader.
        
        Texture filtering operations as well as mipmap generation are carried out 
        in linear space.

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