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.
>
> 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?)
I havn't made any progress on this one. I wanted to learn more about
OpenGL first and was reading Mesa code, too. And I got distracted by
other problems :-|
I was hoping that the transition to Mesa 4.1 may fix some of the
lighting problems (tell me, if my hope is in vain.) So I won't spend too
much effort now. I'll see if I can track down that gcc-3.2 wire-box
issue during the weekend.
Anyway, I'm amazed how quickly the work on the new branches
(mesa-4-1, texmem) is proceeding. Great work! (didn't test myself yet,
though ;)
Cheers,
Felix
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