[Bug 77412] PBO glDrawPixels fails with MSAA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77412

--- Comment #2 from Kenneth Graunke <kenneth at whitecape.org> ---
The hardware blitter doesn't understand MSAA, so we really shouldn't use it. 
Our other options are Meta or BLORP.  We're generally trying to move away from
BLORP, so my preferred solution would be to improve the Meta path.

(As an aside, it looks like _mesa_meta_DrawPixels doesn't think about MSAA
either, and maybe it needs to...)

It looks like _mesa_meta_DrawPixels is interpreting ClampFragmentColor ==
GL_FIXED_ONLY stupidly, and thinking it needs to go through a float buffer when
it doesn't.  Fixing that would speed this up by around 20%.

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