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  SSK7  SSKJr  S rg)	aº  OpenGL extension SGIS.texture_edge_clamp

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

Overview (from the spec)
        
        The base OpenGL provides clamping such that the texture coordinates are
        limited to exactly the range [0,1].  When a texture coordinate is
        clamped using this algorithm, the texture sampling filter straddles the
        edge of the texture image, taking 1/2 its sample values from within the
        texture image, and the other 1/2 from the texture border.  It is
        sometimes desirable to clamp a texture without requiring a border, and
        without using the constant border color.
        
        This extension defines a new texture clamping algorithm.
        CLAMP_TO_EDGE_SGIS clamps texture coordinates at all mipmap levels such
        that the texture filter never samples a border texel.  When used with a
        NEAREST or a LINEAR filter, the color returned when clamping is derived
        only from texels at the edge of the texture image.  When used with
        FILTER4 filters, the filter operations of CLAMP_TO_EDGE_SGIS are defined
        but don't result in a nice clamp-to-edge color.
        
        CLAMP_TO_EDGE_SGIS is supported by 1, 2, and 3-dimensional textures
        only.

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