https://bugs.freedesktop.org/show_bug.cgi?id=96656

            Bug ID: 96656
           Summary: [regression, bisected] all textureGather piglits fail
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]

Hi,

After bisecting, the first bad commit is:

3735a925ef5692c836c4d26d6adee370dae1c2b0 is the first bad commit
commit 3735a925ef5692c836c4d26d6adee370dae1c2b0
Author: Nicolai Hähnle <[email protected]>
Date:   Wed Jun 8 13:24:14 2016 +0200

    st/mesa: cache staging texture for glReadPixels

    v2: add ST_DEBUG flag for disabling (suggested by Ilia)

    Reviewed-by: Marek Olšák <[email protected]> (v1)

:040000 040000 f3adb5adc43e4def32bd23896489520d8cae84c6
72b374e2221e9cc1306d7bfacf39780ec5e42d36 M      src

Test case:
bin/textureGather fs nonconst r 0 float 2D repeat -auto -fbo
[And all textureGather variants also fail.]

Hardware:
NVIDIA GK107, but this probably affects all Gallium drivers.

Disabling the glReadPixels cache fixes the regression.

$ ST_DEBUG="noreadpixcache" bin/textureGather fs nonconst r 0 float 2D repeat
-auto -fbo
PIGLIT: {"result": "pass" }

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