Graphics.Rendering.OpenGL.Raw.EXT.TextureCompressionRGTC
glGetEXTTextureCompressionRGTC
gl_EXT_texture_compression_rgtc
gl_COMPRESSED_RED_GREEN_RGTC2_EXT
gl_COMPRESSED_RED_RGTC1_EXT
gl_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT
gl_COMPRESSED_SIGNED_RED_RGTC1_EXT