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

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

Overview (from the spec)
        
        This extension is intended to supplement the GL_OES_read_format
        extension by adding support for more format/type combinations to be used
        when calling ReadPixels.  ReadPixels currently accepts one fixed
        format/type combination (format RGBA and type UNSIGNED_BYTE) for
        portability, and an implementation specific format/type combination
        queried using the tokens IMPLEMENTATION_COLOR_READ_FORMAT_OES and
        IMPLEMENTATION_COLOR_READ_TYPE_OES (GL_OES_read_format extension).  This
        extension adds the following format/type combinations to those currently
        allowed to be returned by GetIntegerV:
        
        format                      type
        ------                      ----
        BGRA_IMG                    UNSIGNED_BYTE
        BGRA_IMG                    UNSIGNED_SHORT_4_4_4_4_REV_IMG
        
        E.g. Calling GetIntegerv with a <pname> parameter of
        IMPLEMENTATION_COLOR_READ_FORMAT_OES can now return BGRA, with the
        corresponding call to GetIntegerv using a <pname> parameter of
        IMPLEMENTATION_COLOR_READ_TYPE_OES returning UNSIGNED_BYTE;

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