#These are for compatibility with the old libGL. noop SGI_color_table noop EXT_convolution noop EXT_cull_vertex noop NV_fence noop SGIS_detail_texture noop SGIX_fragment_lighting noop SGIX_flush_raster noop EXT_vertex_array noop SGIX_instruments noop EXT_histogram noop NV_vertex_program noop PGI_misc_hints noop SGIS_multisample noop EXT_multisample