[Bug 83646] New: [BSW]Piglit spec_ARB_texture_gather_textureGatherOffset_vs-rg-none-int-2D fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83646

          Priority: medium
            Bug ID: 83646
          Assignee: idr at freedesktop.org
           Summary: [BSW]Piglit
                    spec_ARB_texture_gather_textureGatherOffset_vs-rg-none
                    -int-2D fails
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/i965
           Product: Mesa

System Environment:
--------------------------
Platform: BSW
Libdrm:    (master)libdrm-2.4.56-21-g8c2ae1695913990cbe6c6a8aa294f354eba33bd0
Mesa:    (master)dc0bd799cabdd974b05bd217304944392169fb50
Xserver:(master)xorg-server-1.16.0-152-g3a51418b2db353519a1779cf3cebbcc9afba2520
Xf86_video_intel:(master)2.99.914-94-g908520a7dacade8b6716e7c30549847464a33a81
Libva:    (master)c356638098e55453d2fac8bbb92eafc8cc32d6f4
Libva_intel_driver:(master)812d8d039031bf20e66748a39edcdb8f9c798ec4
Kernel:   (drm-intel-nightly)51c49eafab38a20bdd12344d31d09810c9b0c3f6

Bug detailed description:
---------------------------
It fails on BSW with mesa master branch.
The result shows pass on our earlier automation test, but the pass is not
reproducible.
It pass on IVB/BDW.
Following cases also fail.
spec_ARB_texture_gather_textureGatherOffset_vs-rg-red-unorm-2DArray
spec_ARB_texture_gather_textureGatherOffset_vs-rgb-blue-int-2D
spec_ARB_texture_gather_textureGather_vs-rg-red-uint-2D

output:
Probe color at (3,4)
  Expected: 0.639216 0.643137 0.517647 0.513726
  Observed: 0.639216 0.627451 0.517647 0.529412
Probe color at (21,4)
  Expected: 0.709804 0.713726 0.588235 0.584314
  Observed: 0.709804 0.698039 0.588235 0.584314
Probe color at (21,7)
  Expected: 0.082353 0.086275 0.964706 0.960784
  Observed: 0.082353 0.086275 0.949020 0.960784
Probe color at (11,11)
  Expected: 0.545098 0.549020 0.423529 0.419608
  Observed: 0.545098 0.533333 0.423529 0.411765
Probe color at (29,13)
  Expected: 0.866667 0.870588 0.745098 0.741176
  Observed: 0.850980 0.870588 0.745098 0.741176
Probe color at (13,14)
  Expected: 0.929412 0.933333 0.807843 0.803922
  Observed: 0.913725 0.933333 0.807843 0.803922
PIGLIT: {"result": "fail" }


Reproduce steps:
-------------------------
1. xinit
2. bin/textureGather vs rg int 2D -fbo -auto

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