[Nouveau] [Bug 100177] [GM206] Misrendering in XCOM Ennemy Within

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100177

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I have an unproven theory that this is related to polygon-offset failing on
GM20x. Can't figure out what we're missing. In the GM20x traces it seems like
it's jumping through crazy hoops to set all the polygon offset stuff by using a
macro to write out the values. It's effectively conditional on the value in
some scratch register. I suspect it's to be able to apply a CSO without
recomputing it, and adjusting its effect by adjusting scratch registers.
However things are configured s.t. it does do the writes.

One thought is that there's a register somewhere that sets the value of "r",
i.e. the unit of polygon offset. This has traditionally been driven off the
depth format as a function of rasterization details, but perhaps now it's set
explicitly. It'd be 1/1<<24 for Z24, 1/1<<16 for Z16, and "variable" for Z32F.
However no such setting has been found, and there's nothing obvious in the
trace.

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