Re: Spline fog for RE2/Opengl

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Steve Baker (steve++at++mred.bgm.link.com)
Wed, 4 Jun 97 08:53:40 -0500

> There was a plan :-) pffog man page has details of spline fog ( for RE2 and iR
> ) in pf 2.0 and 2.1. As far as I know all works OK.
>
> On Jun 3, 4:59pm, ken sartor wrote:
> > Subject: Spline fog for RE2/Opengl
> >
> > Hi -
> >
> > To the Performer team - is there any plan to implement spline
> > fog for RE2s under OpenGL? This would be a really great thing!
> > If so, what type time scale might it occur on? If not :(

I don't think spline for works with OPENGL on the RE2 - although it does
work with IrisGL.

The OpenGL I have on my RE2 (under Irix 5.3) doesn't report the necessary
OpenGL extensions when you do the appropriate glGet.

Irix 5.3/RE2:

GL_VENDOR ='SGI'
GL_RENDERER ='REV/M/2/2'
GL_VERSION ='1.0 Irix 5.3'
GL_EXTENSIONS='GL_EXT_abgr GL_EXT_blend_color GL_EXT_blend_logic_op GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_histogram GL_EXT_polygon_offset GL_EXT_texture GL_EXT_texture3D GL_EXT_texture_object GL_EXT_vertex_array GL_SGI_color_matrix GL_SGI_texture_color_table GL_SGIS_detail_texture GL_SGIS_multisample GL_SGIS_sharpen_texture'

Irix 6.2/iR:

GL_VENDOR ='SGI'
GL_RENDERER ='IRS/M/2/16/4'
GL_VERSION ='1.0 Irix 6.2'
GL_EXTENSIONS='GL_EXT_abgr GL_EXT_blend_color GL_EXT_blend_logic_op GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_convolution GL_EXT_copy_texture GL_EXT_histogram GL_EXT_packed_pixels GL_EXT_polygon_offset GL_EXT_subtexture GL_EXT_texture GL_EXT_texture3D GL_EXT_texture_object GL_EXT_vertex_array GL_SGI_color_matrix GL_SGI_color_table GL_SGI_texture_color_table GL_SGIS_detail_texture GL_SGIS_fog_function GL_SGIS_multisample GL_SGIS_point_line_texgen GL_SGIS_point_parameters GL_SGIS_sharpen_texture GL_SGIS_texture_edge_clamp GL_SGIS_texture_filter4 GL_SGIS_texture_lod GL_SGIS_texture_select GL_SGIX_calligraphic_fragment GL_SGIX_clipmap GL_SGIX_fog_offset GL_SGIX_instruments GL_SGIX_interlace GL_SGIX_ir_instrument1 GL_SGIX_flush_raster GL_SGIX_list_priority GL_SGIX_polynomial_ffd GL_SGIX_reference_plane GL_SGIX_shadow GL_SGIX_shadow_ambient GL_SGIX_sprite GL_SGIX_subdiv_patch GL_SGIX_texture_add_env GL_SGIX_texture_lod_bias GL_SGIX_texture_scale_bias GL_SGIX_depth_texture '

Notice that GL_SGIS_fog_function and GL_SGIX_fog_offset are absent from the RE2 dump.

So, if you really need spline fog on your RE2 - you might have to consider
reverting to IrisGL Performer (unless something got fixed in Irix 6.2)

   :-(

Steve Baker 817-619-1361 (Vox-Lab)
Hughes Training Inc. 817-619-8776 (Vox-Office/Vox-Mail)
2200 Arlington Downs Road 817-619-4028 (Fax)
Arlington, Texas. TX 76005-6171 Steve++at++MrEd.bgm.link.com (eMail)
http://www.hti.com (external) http://MrEd.bgm.link.com/staff/steve (intranet)
                                http://web2.airmail.net/sjbaker1 (external)

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