[Mesa-dev] meta CopyTexSubImage and BlitFramebuffer, intel front buffer bugs

[Eric Anholt]

Here's another series of meta stuff: Replacing the winsys MSAA blits with
meta instead of blorp where possible, and making CopyTexSubImage use meta
instead of blorp.  In the process I found I had to fix some other bugs in
meta's BlitFramebuffer.

There are a few intel patches at the start to avoid regressions from this
code -- the way I happened to bind the renderbuffers for the MSAA blits
tickled those bugs.  However, front buffer rendering is so incredibly
fragile that, even though I think they're correct bugfixes, I don't want
to mark them as stable candidates.

This is on the meta-ctsi-2 branch of my tree.