On Fri, 11 Oct 2002 18:00:18 +0100
Keith Whitwell <[EMAIL PROTECTED]> wrote:
> Felix Kühling wrote:
> > On 11 Oct 2002 18:15:08 +0200
> > Michel Dänzer <[EMAIL PROTECTED]> wrote:
> >
> >
> >>I was looking into the lighting issues Felix reported with the
> >>xscreensaver pulsar hack (when running it with the -light option). One
> >>side of the planes looks good, the other one is black, so I thought it
> >>might be related to two-sided primitives.
> >>
> >>Indeed, the hardware TCL code has a fallback for this if the material is
> >>different on both sides. If I hardcode that to always trigger (in
> >>check_twoside_fallback() in radeon_state.c), pulsar looks good with
> >>lighting.
>
>
> I think this is effectively the same as setting 'R200_NO_TCL=t'.
>
> >>So I thought I'd see if this was related to some lighting oddities in
> >>bzflag, and I made another interesting discovery: with this fallback, it
> >>locks up the chip when connecting to a server, like I reported before
> >>for software TCL.
> >>
> >>In summary, there seem to be multiple problems related to two-sided
> >>lighting in the radeon driver, both with hardware and software TCL. I'll
> >>keep looking into them, but I hope this information will help someone
> >>else find them more quickly.
> >>
> >
> > One observation which confused me was that it looked good if I set the
> > alpha channel of global ambient to something other than 1.0 (or was it
> > 0.0?)
>
> Which makes me wonder if it's a codegen/vtxfmt problem -- what happens with
> R200_NO_VTXFMT=t ?
Neither RADEON_NO_VTXFMT nor RADEON_NO_CODEGEN make any difference.
Felix
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