[Bug 88521] GLBenchmark 2.7 TRex renders with artifacts on Gen8 with SNA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88521

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Driver/intel                |Drivers/DRI/i965
            Version|unspecified                 |git
           Assignee|chris at chris-wilson.co.uk    |idr at freedesktop.org
            Product|xorg                        |Mesa
         QA Contact|intel-gfx-bugs at lists.freede |intel-3d-bugs at lists.freedes
                   |sktop.org                   |ktop.org

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
Ok, I spotted the corruption - it seems easiest to spot watching just below
halfway down the screen as a green/brown rope extending across the scene.

That is not the corruption I was thinking of and is internal to mesa. It might
be the same GEN8_3DSTATE_VF_INSTANCING pollution but in reverse?

i.e. commit 0532a3313ad9c76a6e1d28e8a1c2ea495583fead
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Nov 5 20:11:54 2014 +0000

    sna/gen8: Clear instancing enabled bit between batches

    gen8 sets the instancing bit relative to the vertex element, but we were
    clearing it for the vertex buffer. As the maximum number of vertex
    elements is fixed, just clear them all when emitting our header. Note
    that VF_SGVS is not sufficient by itself to disable all side-effects of
    instancing.

    Thanks to Kenneth Graunke for pointing out the change from vertex buffer
    to vertex element of the instancing enable bit.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84958
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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