[Gtkradiant] ATI FireGL 8800 issues

Arnout 'RR2DO2' van Meer gtkradiant@zerowing.idsoftware.com
Tue, 15 Oct 2002 14:21:51 +0100

As a sidenote - they render fine on my 8500.

- Arnout

-----Original Message-----
From: Joseph, William [mailto:WJoseph@europe.ea.com]=20
Sent: 15 October 2002 14:18
To: 'gtkradiant@zerowing.idsoftware.com'
Subject: RE: [Gtkradiant] ATI FireGL 8800 issues

Radiant has always used different glPolygonModes for front and back on
patches - to make them look wireframe from the back - we need to
double-check the 1.1 code to be sure. I think the difference might be
that 1.2 uses it on brushes (which are drawn with a GL_POLYGON) to
reduce state changes between rendering brushes and patches. If it's only
a problem with brushes, the solution sounds fairly obvious. If it's a
problem with patches too, we'll have to rethink the way patches are

-----Original Message-----
From: David Olofson [mailto:david.olofson@reologica.se]
Sent: 15 October 2002 13:31
To: gtkradiant@zerowing.idsoftware.com
Subject: Re: [Gtkradiant] ATI FireGL 8800 issues

On Tuesday 15 October 2002 14:03, Timothee Besset wrote:
> http://dri.sourceforge.net/dri_status.phtml
> lists the 8500 in the supported chipsets

Well, at least, they don't say anywhere that the FireGL 8800 *doesn't*=20
work, so I'll give it a try. :-) The Win9x and Summit drivers may be=20
deliberately cripled or something, to crash or refuse to load unless
find one of the "gaming versions".

> The rendering changes are new to 1.2, and have been a great=20
> improvement overall (that is, on supported drivers). Spog wrote that=20
> code, he can probably look into the fixes. It sounds like this is yet=20
> another fix we will want in 1.2.11

I'd be interested in knowing why GL_LINE + GL_FILL is used this way in=20
the first place. (I'd prefer fixing things the right way, if possible.)=20

Any problem with always using the same mode for both faces? Could have=20
missed something, but it seems that whenever front and back face modes=20
are different, one face is culled anyway, so it shouldn't matter to any=20

//David Olofson - Programmer, Composer, Open Source Advocate

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