Bug 102464

Summary: [SNB] piglit.spec.arb_texture_gather.texturegather fails
Product: Mesa Reporter: Mark Janes <mark.a.janes>
Component: Drivers/DRI/i965Assignee: Intel 3D Bugs Mailing List <intel-3d-bugs>
Status: RESOLVED MOVED QA Contact: Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity: normal    
Priority: medium    
Version: git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:

Description Mark Janes 2017-08-28 21:08:56 UTC 
the following piglit commit regressed several tests on SNB only:

a76e2db38179a7923745b4f9b15fd94198e8cfab
Author:     Neha Bhende <bhenden@vmware.com>

textureGather: correct expected result for GL_MAX_PROGRAM_TEXTURE_GATHER_COMPONENTS_ARB = 1

Expected results were with respect to
GL_MAX_PROGRAM_TEXTURE_GATHER_COMPONENTS_ARB = 4.  This patch fixes
it for GL_MAX_PROGRAM_TEXTURE_GATHER_COMPONENTS_ARB = 1 as well.

Reviewed-by: Brian Paul <brianp@vmware.com>


About 100 tests regressed, eg:
--------------------------------------------------------------------
piglit.spec.arb_texture_gather.texturegatheroffset.fs-r-one-int-2d

Standard Output

/tmp/build_root/m64/lib/piglit/bin/textureGather fs offset r one int 2D -auto -fbo
piglit: debug: Requested an OpenGL 3.1 Forward-Compatible Core Context, and received a matching 3.3 context

Probe color at (1,1)
  Expected: 1.000000 0.000000 0.000000 0.000000
  Observed: 1.000000 1.000000 1.000000 1.000000
Probe color at (2,1)
  Expected: 1.000000 0.000000 0.000000 0.000000
  Observed: 1.000000 1.000000 1.000000 1.000000
Probe color at (3,1)
  Expected: 1.000000 0.000000 0.000000 0.000000
  Observed: 1.000000 1.000000 1.000000 1.000000
--------------------------------------------------------------------

Since this test passes other platforms, it may be an SNB-specific mesa bug.
Comment 1 Kenneth Graunke 2017-08-29 04:02:22 UTC 
This being Sandybridge specific is unsurprising - that's the only platform that has GL_MAX_PROGRAM_TEXTURE_GATHER_COMPONENTS == 1.  All others are 4.
Comment 2 GitLab Migration User 2019-09-25 19:03:48 UTC 
-- GitLab Migration Automatic Message --

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