[Nouveau] [Bug 92306] GL Excess demo renders incorrectly on nv43

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92306

--- Comment #12 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Andrew Randrianasulu from comment #11)
> "Mismatched color and zeta formats, ignoring zeta."

Yeah, as I suspected... unfortunately there's not a ton you can do besides
fixing the issue. The problem is that you can't render to a 32-bit color format
(e.g. RGBA8) while using a 16-bit zeta (Z16), and conversely you can't render
to a 16-bit color format (e.g. RGB565) while using a 32-bit zeta (Z24S8).

My current solution to this problem is to just not set the zeta buffer and move
on with life. This leads to incorrect rendering, but at least no hangs.

The proper solution is to have 2 depth textures that you copy to and fro and
set the "right" one for the given color format. Ideally while minimizing the
number of copies.

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