On Thu, Nov 07, 2002 at 07:48:55AM -0800, Ian Romanick wrote:
> On Wed, Nov 06, 2002 at 11:41:00PM +0100, Dieter N�tzel wrote:
> > Am Mittwoch, 6. November 2002 23:23 schrieb Adam K Kirchhoff:
> > > Hello all,
> > >
> > > These two links show screenshots of glaxium on two separate
> > > machines, one with an r100 (original 64 Meg Radeon) and one with an r200
> > > (Radeon 8500).
> > >
> > > http://memory.visualtech.com/glaxium-r100.png
> > > http://memory.visualtech.com/glaxium-r200.png
> > >
> > > You may notice that, quite frankly, the floor looks much nicer on
> > > the r100 than on the r200. Can anyone explain why this would be the case?
> > > Shouldn't the r200 support all the same extensions as the r100?
> >
> > Broken textures in the r200 branch?
> > Have you tried with TCL disabled?
> >
> > Please try both with parsec. I see some texture corruption with the r200
> > there, too.
>
> I know that glaxium is, but is parsec using DOT3? If so, I believe that may
> be the problem. I know that the R200 driver doesn't handle the scale factor
> correctly for ARB_texture_env_dot3 (it always uses a 1x scale). However, I
> don't think /that/ by itself would cause that problem. If that were the
> case, then it would run unbearably slow on R100 (using a non-1x scale causes
> a sw fallback on R100).
Actually, I found the bug. The R200 driver exports EXT_texture_env_dot3,
but the GL_COMBINE case in r200UpdateTextureEnv (r200_texstate.c) doesn't
have cases for the GL_DOT3_{RGB,RGBA}_EXT enums. The _EXT version *IS*
different (and has different enums) than the ARB/OpenGL 1.3 version.
Adding case-statements for the _EXT enums everywhere there's a non-EXT enum
should fix the problem, modulo the incorrect implmentation of the non-EXT
version mentioned above. There was some discussion of this a couple months
ago WRT the R100 driver.
--
Smile! http://antwrp.gsfc.nasa.gov/apod/ap990315.html
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