[Bug 83046] [BDW bisected]] Warsow v1.0/Xonotic v0.7/Gputest v0.5_triangle_fullscreen/synmark2_v6/GLBenchmark v2.5.0/GLBenchmark v2.7.0/Ungine-demos performance reduced 30%~60%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83046

--- Comment #3 from Kenneth Graunke <kenneth at whitecape.org> ---
Created attachment 105777
  --> https://bugs.freedesktop.org/attachment.cgi?id=105777&action=edit
Attempt to fix the scaledown rectangle

The resolve rectangle scaledown factor appears to be wrong.  (The fast clear
rectangle looks fine - just the resolve is wrong.)  See 3D > Pixel > Pixel
Backend [IVB+] > Render Target Resolve [IVB+].

The attached patch tries to work around it.  With that patch, EgyptHD
performance goes up by 2.75x to the expected speed (the one I see when using
repdata clears only).

Unfortunately, I'm not physically in the same location as my Broadwell
machine's monitor right now, so I can't watch and see if the rendering is
correct or not.  But it does pass Piglit.

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