Mark Allan wrote:
>
> Brian Paul wrote:
> >
> > Pasi Kärkkäinen wrote:
> > >
> > > Hello!
> > >
> > > Are there known blending bugs in the mga-driver (g400)? When I render many
> > > additive polygons on the top of each other with small alpha-value
> > > (something like 0.05) the result is something it shouldn't be with g400.
> > > With software-mesa it's correct as well as with nvidia's drivers.
> > >
> > > If this is not a known issue, I might do little app that demonstrates
> > > this..
> >
> > I've found that the accuracy of blending isn't always very good on
> > some hardware. Not much can be done about that.
> >
> > -Brian
>
> I doubt it's a problem with the hardware itself. I've done comparisons
> with DRI, Utah, XIG, and Win2K G400 drivers - both Utah and DRI produce
> poor results with additive blending, whereas the XIG and Windows drivers
> look normal. I'll try and assemble some screenshots that demonstrate the
> discrepancies.
I've created a test case and put up some screenshots that show the
blending problems with the G400:
http://www.reptilelabour.com/TEMP/G400_DRI_blend/
G400 DRI and Utah are the only drivers that display the problem. WinNT,
Win2K and XIG G400 drivers all display expected blending results.
-Mark
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