Comment # 13 on bug 90887 from Béla Gyebrószki

I tried the patch from comment #9 and it indeed fixed the rendering issues in
the games like Two Worlds 2, Trine: Enchanted Edition, Trine 2, XCOM:Enemy
Unknown, Stacking (running in Wine).
The patch greatly improves image quality but doesn't fix the rendering issues
completely in Sonic Generations or in The Raven: Legacy of a Master Thief, see
the screenshot for comparison between unmodified and patched nouveau:
https://drive.google.com/open?id=0B-tTbLKBl-tOdldDb1pRNENnYUk

VGA compatible controller: NVIDIA Corporation G92 [GeForce GTS 250] (rev a2)
Mesa 3D 10.6-branchpoint-541-g104bff0