On Sun, 9 Jun 2002, David Bronaugh wrote: > Hey all, > > I was playing quake3 on my laptop here (which has a 3D Rage Pro chip) > and noticed a few problems with the rendering. Here are comparison shots > (taken with identical settings) on my TNT2 and on the Mach64-based card: > > http://bronaugh.linuxboxen.org/q3dm1_tnt2.jpg > http://bronaugh.linuxboxen.org/q3dm1_mach64.jpg > > This is with the latest CVS (downloaded last night). > > Map was q3dm1. Lightmap lighting was enabled, GL extensions were > enabled, texture detail was the same (second from highest), geo. detail > was medium. High quality sky was off (it just distracts). > > You can see clearly the major rendering glitch with the mach64 on the > walls - the texture just isn't integrated as it should be.
I've noticed those particular textures as well. My guess is that it could be a result of the card not being able to modulate alpha values for the GL_MODULATE texture environment. This is a conformance problem that can't be worked around without essentailly making all textured polygons software fallbacks. In most games I've tested with, GL_MODULATE is the most used texture environment (Quake3 uses it almost exclusively, I think). The more recent builds of Quake3 have some workarounds for the RagePRO that fix transparency problems with smoke trails and such which were evident in the demo, however. Having said all that, I haven't actually verified that this is the problem in this particular case, but I have seen texture transparency problems in UT that I know are because of this hardware limitation. I think once we merge in the current Mesa fixes from the DRI trunk, we can look at fixing any remaining GL compliance problems (there are still failures with glean tests at the moment). However, some compliance problems like the one with GL_MODULATE are hardware limitations that we'll have to live with if we want hardware acceleration. > Also, there's no mipmapping, but that's less of an issue. Mipmapping is broken on mach64, unfortunately. ATI's Windows drivers don't support mipmapping either. > Any ideas? I'd love to help here, but I don't know where to start. > > David Bronaugh > > _______________________________________________________________ > > Don't miss the 2002 Sprint PCS Application Developer's Conference > August 25-28 in Las Vegas - >http://devcon.sprintpcs.com/adp/index.cfm?source=osdntextlink > > _______________________________________________ > Dri-devel mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/dri-devel > -- Leif Delgass http://www.retinalburn.net _______________________________________________________________ Don't miss the 2002 Sprint PCS Application Developer's Conference August 25-28 in Las Vegas - http://devcon.sprintpcs.com/adp/index.cfm?source=osdntextlink _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
