Created attachment 90320 [details]
glitches with sb
Seen on a BARTS class radeon with mesa master, 10.0 and 9.2 branches, see screenshot.
These glitches do not occur with R600_DEBUG=nosb
Using the current build 193968 of ss3.
Created attachment 90321 [details]
Created attachment 90386 [details] [review]
Does this patch help?
Yes it does, thanks Vadim!
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".
Fixed by commit 00faf828