[Bug 89314] [HSW, regression, bisected] i965/pixel_read: Use meta_pbo_GetTexSubImage for PBO ReadPixels (ef0499af255ecd)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89314

--- Comment #7 from Jason Ekstrand <jason at jlekstrand.net> ---
Ok, I dug into it a bit.  This looks like it isn't actually an error in the PBO
upload path.  Instead, it's a subtle difference in format conversion between
what's happening in the meta PBO path and what's happening in software.  Neil
Roberts put together some patches to make them closer in some cases.  I think
we just need to extend that to when going from 10-bit to 8-bit.  I'll look into
it.

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