Comment # 4 on bug 72369 from Benjamin Bellec

I also had these glitches in Serious Sam 3 and a Radeon HD5870 (AMD CYPRESS)
using Mesa 10.1.0-devel (git-1e71493). But no glitches with 9.2.4 (Fedora
packages).

Anyway your patch Vadim fixes the problem indeed. But to be more precise, the
glitches was only here when FXAA (Fast Approximate Anti-Aliasing) was set to
"High" or "Ultra", but not when set to "None", "Low" or "Medium".