With the ATI_fs patch series v4 applied (even the ones that are not in master
yet), I see no such glitches in KotOR 2. Shadows are correct, and fog is
correct. The only problem I see is that enabling soft shadows makes the shadows
so faint they are barely visible, but I think that's a bug in the game.

I'm using latest Mesa from git, llvm 3.7.1, Wine 1.9.6.

Note that Steam only offers the remastered version of KotOR2 now, which doesn't
use ATI_fs anymore. The screenshots on the store page may be from the old
version though.