Graphics.Rendering.OpenGL.Raw.ARB.TextureCompressionRGTC
glGetARBTextureCompressionRGTC
gl_ARB_texture_compression_rgtc
gl_COMPRESSED_RED_RGTC1
gl_COMPRESSED_RG_RGTC2
gl_COMPRESSED_SIGNED_RED_RGTC1
gl_COMPRESSED_SIGNED_RG_RGTC2