Created attachment 113176 [details]
Vertex issues in TF2

I've re-tested Portal with updated mesa (commit
2335153ff2fae01d6294876a86d3eab59c6c4236) and kernel (3.18.5-gentoo) and the
issue is still there.

There also seems to be a rendering regression with TF2 for me, but it looks
different. Where in Portal objects appear in front of others that they should
be behind of, in TF 2 they disappear entirely or appear to have garbage
vertices. I haven't yet tested that the TF2 issues were introduced in the same
commit.

I'll create apitraces of both later today.