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'''OpenGL extension ARB.texture_compression_rgtc
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This module customises the behaviour of the
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OpenGL.raw.GL.ARB.texture_compression_rgtc to provide a more
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Overview (from the spec)
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This extension introduces four new block-based texture compression
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formats suited for unsigned and signed red and red-green textures
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(hence the name "rgtc" for Red-Green Texture Compression).
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These formats are designed to reduce the storage requirements
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and memory bandwidth required for red and red-green textures by
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a factor of 2-to-1 over conventional uncompressed luminance and
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luminance-alpha textures with 8-bit components (GL_LUMINANCE8 and
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GL_LUMINANCE8_ALPHA8).
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The compressed signed red-green format is reasonably suited for
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storing compressed normal maps.
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This extension uses the same compression format as the
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EXT_texture_compression_latc extension except the color data is stored
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in the red and green components rather than luminance and alpha.
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Representing compressed red and green components is consistent with
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the BC4 and BC5 compressed formats supported by DirectX 10.
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The official definition of this extension is available here:
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http://www.opengl.org/registry/specs/ARB/texture_compression_rgtc.txt
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from OpenGL import platform, constants, constant, arrays
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from OpenGL import extensions, wrapper
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from OpenGL.GL import glget
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from OpenGL.raw.GL.ARB.texture_compression_rgtc import *
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