[Bug 89058] [SKL]Render error in some games (etqw-demo, nexuiz, portal)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89058

--- Comment #25 from Neil Roberts <neil at linux.intel.com> ---
Created attachment 114491
  --> https://bugs.freedesktop.org/attachment.cgi?id=114491&action=edit
WIP patch

After digging around in the code a bit I'm pretty sure it doesn't normally try
to prevent the src and dest being the same for send instructions. I tried
experimenting to force Mesa to allocate the same src and dst for an FS texture
sample in a simple test on Haswell and it also seems to break so now I'm
wondering whether it's a general restriction on many platforms and it's just
coincidence that we haven't hit it yet.

This patch seems to fix the rendering error for me but it's not a complete
patch because of the reasons described in the commit message.

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