[Bug 77412] PBO glDrawPixels fails with MSAA

[bugzilla-daemon at freedesktop.org]

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

--- Comment #4 from Kenneth Graunke <kenneth at whitecape.org> ---
Oh, great!  I might have had my laptop on battery or something - it doesn't
clock up properly unless it's on AC.  3x sounds believable.

Although we normally allocate textures as tiled (since it's faster), there's no
hardware requirement that we do so - untiled textures work just fine.  I don't
see why we couldn't use a PBO as a texture source.  It'd probably just require
creating a gl_texture_object wrapper object.

We have a BindRenderbufferAsTexture driver hook that for turning a
gl_renderbuffer into a gl_texture_object...we might need a BindPBOAsTexture
hook or something.

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