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