[Bug 86490] Some Unreal Engine 4.5 Demos render only black on radeonsi

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=86490

            Bug ID: 86490
           Summary: Some Unreal Engine 4.5 Demos render only black on
                    radeonsi
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: haagch@frickel.club

Hardware:
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Wimbledon XT [Radeon HD 7970M] (rev ff)

So I'm using radeonsi with PRIME and latest mesa git, recent llvm 3.6 revision.

I foolishly deleted the old Unreal Engine Demos so I can't make a recent test,
but they worked decently last time I checked.

Now the Unreal Demos have been updated to UE 4.5:
https://wiki.unrealengine.com/Linux_Demos

"Tappy Chicken": Works fine on intel and radeonsi.
"Shooter Game": Works fine on intel, but shows only game HUD and text on
radeonsi
"Light Room Interior Day Demo": Works fine on intel but is completely black on
radeonsi

Apitrace says the only problems are:

$ DRI_PRIME=1 glretrace Lightroominteriorday.trace
882: glDebugOutputCallback: Medium severity API other issue 1, FBO incomplete:
no attachments [-1]

0 4096 glXSwapIntervalMESA(interval = 0) = 0
4096: warning: unsupported glXSwapIntervalMESA call
context mis-match in pipe_sampler_view_release()
Rendered 191 frames in 13.88 secs, average of 13.7608 fps

Here is the trace from which I got the above output:
http://haagch.frickel.club/files/Lightroominteriorday.trace.xz
It renders fine on intel, but only black on radeonsi.

(Careful: When creating a trace on intel, the engine will use
glCopyImageSubData which is not supported on radeonsi. When creating a trace on
radeonsi it will not.)

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