[Nouveau] [Bug 64323] Severe misrendering in Left 4 Dead 2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=64323

--- Comment #11 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
A suspiciously similar bug for nvc0 was fixed with
72295c5f6715555082455072bfd29a1e5ae545de

nvc0: restore viewport after blit

I think you need to set viewport in nv50_blit_3d in the same way nvc0_blit_3d
does, and then restore the old viewport afterwards in similar to the referenced
commit. I didn't fix it at the time for nv50, because it wasn't setting the
viewport. It looks like this was a bug.

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