[Bug 77412] PBO glDrawPixels fails with MSAA

[bugzilla-daemon at freedesktop.org]

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

--- Comment #3 from Alexander Monakov <amonakov at gmail.com> ---
On what hardware did you get just 20%?  I'm getting about 3x overall speedup on
IvyBridge (roughly 10s -> 3s run time), plus 10% faster if I change GL_BGRA to
GL_RGBA in the testcase source, otherwise it performs channel swizzle for
temporary texture.

As I understand to make Meta viable for this you'd need to be able to interpret
PBO (linear) as a texture (normally tiled) without intermediate copying.  From
what I know, such capability existed in Mesa some time ago but not anymore.

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