OpenGL extension ARB.texture_compression_rgtc
This module customises the behaviour of the
OpenGL.raw.GL.ARB.texture_compression_rgtc to provide a more
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
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:
|EXTENSION_NAME = 'GL_ARB_texture_compression_rgtc'|
GL_COMPRESSED_RED_RGTC1 = GL_COMPRESSED_RED_RGTC1
GL_COMPRESSED_RG_RGTC2 = GL_COMPRESSED_RG_RGTC2
GL_COMPRESSED_SIGNED_RED_RGTC1 = GL_COMPRESSED_SIGNED_RED_RGTC1
GL_COMPRESSED_SIGNED_RG_RGTC2 = GL_COMPRESSED_SIGNED_RG_RGTC2
__file__ = '/home/mcfletch/pylive/OpenGL/GL/ARB/texture_compression_rgtc.pyc'
__name__ = 'OpenGL.GL.ARB.texture_compression_rgtc'
__package__ = 'OpenGL.GL.ARB'