[Bug 94668] [IVB, BYT] Cube/3D sampling broken for INT/UINT formats

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94668

Kenneth Graunke <kenneth at whitecape.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from Kenneth Graunke <kenneth at whitecape.org> ---
This is "fixed" by:

commit d4a5a61d445e683c20de00c1febe847b4c2db910
Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Mon Mar 28 20:07:13 2016 -0700

    i965: Don't use CUBE wrap modes for integer formats on IVB/BYT.

    There is no linear filtering for integer formats, so we should always
    be using CLAMP_TO_EDGE mode.

    Fixes 46 dEQP cases on Ivybridge (which were likely broken by commit
    0faf26e6a0a34c3544644852802484f2404cc83e).

    This workaround doesn't appear to be necessary on any other hardware;
    I haven't found any documentation mentioning errata in this area.

    v2: Only apply on Ivybridge/Baytrail to avoid regressing GLES3.1 tests.

    Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
    Reviewed-by: Jason Ekstrand <jason at jlekstrand.net> [v1]

This leaves gather4 on cubes doing the wrong thing at edges (see bug 94621),
but there are no tests for that until ES 3.1 is enabled.  So I'm punting on the
problem for now.  There's no real good solution for it, but there are some
hacks that could be done to alleviate the problem in many cases.

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