        Extension Name			Supported By 			SampleGL
   -----------------------------------------------------------------------------

    1	EXT_abgr			SGI,KGC,IBM			1.0.16
    2	EXT_blend_color			SGI,KGC,Intergraph,HP		1.0.16
    3	EXT_polygon_offset		SGI,KGC,Intergraph,IBM		1.0.16
    4	EXT_texture			SGI,KGC,Intergraph		1.0.16
    6	EXT_texture3D			SGI,E&S,IBM,HP
    7	SGIS_texture_filter4		SGI,KGC
    9	EXT_subtexture			SGI,KGC,Intergraph,IBM(1)	1.0.16
   10	EXT_copy_texture		SGI,E&S
   11	EXT_histogram			SGI,KGC, Intergraph
   12	EXT_convolution			SGI,KGC,HP
   13	SGI_color_matrix		SGI
   14	SGI_color_table			SGI,HP(partial)
   15	SGIX_pixel_texture		SGI
   16	SGIS_texture4D			SGI
   17	SGI_texture_color_table		SGI,E&S,HP
   18	EXT_cmyka			SGI,E&S
   20	EXT_texture_object		SGI,KGC,Intergraph,IBM		1.0.16
   21	SGIS_detail_texture		SGI,KGC
   22	SGIS_sharpen_texture		SGI
   23	EXT_packed_pixels		SGI, Intergraph, E&S
   24	SGIS_texture_lod		SGI
   25	SGIS_multisample		SGI,HP
   26	SGIS_premultiply_blend		SGI
   27   EXT_rescale_normal              IBM
   28	EXT_visual_info			SGI,KGC,IBM			1.0.16
   30	EXT_vertex_array		SGI,KGC,Intergraph,IBM,DEC	1.0.15
   31	EXT_misc_attribute		
   32	SGIS_generate_mipmap		SGI,HP
   33	SGIX_clipmap			SGI
   34	SGIS_shadow			SGI,HP
   35	SGIS_texture_edge_clamp		SGI,Intergraph
   36	SGIS_texture_border_clamp	SGI,Intergraph
   37	EXT_blend_minmax		SGI,KGC,Intergraph,IBM,HP	1.0.16
   38	EXT_blend_subtract		SGI,KGC,Intergraph,IBM,HP	1.0.16
   39	EXT_blend_logic_op		SGI,KGC,Intergraph,IBM		1.0.16
   40	SGI_swap_control		SGI
   41	SGI_video_sync			SGI
   42	SGI_make_current_read		SGI
   43	SGIX_video_source		SGI
   44	EXT_visual_rating		SGI,IBM,HP			1.0.16
   45	SGIX_interlace			SGI
   47	EXT_import_context		SGI,IBM				1.0.16
   49	SGIX_fbconfig			SGI
   50   SGIX_pbuffer			SGI
   51	SGIS_texture_select		SGI
   52   SGIX_sprite			SGI
   54	SGIS_point_parameters		SGI
   56	SGIX_texture_scale_bias		SGI,HP
   57	SGIX_framezoom			SGI
   58	SGIX_tag_sample_buffer		SGI
   60	SGIX_reference_plane		SGI
   63   SGIS_depth_texture		SGI
   64   SGIS_fog_func			SGI
   65   SGIX_fog_offset			SGI
   66   HP_image_transform		HP
   67   HP_convolution_border_modes     HP
   68   INGR_palette_buffer	 	Intergraph
   69   SGIX_texture_env_add		SGI
   74   EXT_color_subtable
   75   EXT_object_space_tess           SGI
   76   PGI_vertex_hints                PGI
   77   PGI_misc_hints                  PGI
   78   EXT_paletted_texture		MS, SGI
   79   EXT_clip_disable		MS, SGI
