[Bug 43332] corrupted output in mesa-demo/fp-tri using r600g on evergreen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=43332

--- Comment #3 from Stefano Teso <stefano.teso at gmail.com> 2011-12-15 09:53:39 PST ---
(In reply to comment #2)
> > The bug is also present in the libGL 7.11.2 shipped by debian, so I don't think
> > it's a regression or a bug in my config.
> 
> It looks like that inst->Dst[0].Register.WriteMask == 3 in tgsi_scs (), so the
> ZW components of the dest register are never written. Perhaps this could
> explain the artifact. Not that I'm a GL expert or anything ;-)

Forcing the mask to 15 fixes the problem. Of course this is no solution. Likely
the fragment color is not cleared properly before calling SCS?

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