Mark Allan wrote:
>
> 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.
I don't have my G400 installed right now but next time I do I'll look
into this.
-Brian
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