[Bug 105095] piglit arb_vertex_type_2_10_10_10_rev-array_types failed for BARTS

[Bug 105095] piglit arb_vertex_type_2_10_10_10_rev-array_types failed for BARTS

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https://bugs.freedesktop.org/show_bug.cgi?id=105095

            Bug ID: 105095
           Summary: piglit arb_vertex_type_2_10_10_10_rev-array_types
                    failed for BARTS
           Product: Mesa
           Version: 17.3
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: benau2006@yahoo.com.hk
        QA Contact: dri-devel@lists.freedesktop.org

Output of arb_vertex_type_2_10_10_10_rev-array_types from piglit tests:

testing: RGBA SINT
testing: RGBA SNORM
Probe color at (25,5)
  Expected: 0.500000 0.250000 0.000000 1.000000
  Observed: 0.501961 0.250980 0.000000 0.333333
testing: RGBA UINT
testing: RGBA UNORM
testing: BGRA SNORM
Probe color at (85,5)
  Expected: 0.000000 0.250000 0.500000 1.000000
  Observed: 0.000000 0.250980 0.501961 0.333333
testing: BGRA UNORM
Mesa version 17.3.3
AMD/ATI Barts PRO Radeon HD 6850

Detail in https://github.com/supertuxkart/stk-code/issues/3097, this bug cause
wrong animation in stk.

And i think 2.2 / 2.3 equation isn't causing this bug, because from what i see
zero is represented correctly in stk, also some amd devs told me barts switched
to use the new formula long time ago.

Any idea?

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[Bug 105095] piglit arb_vertex_type_2_10_10_10_rev-array_types failed for BARTS

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https://bugs.freedesktop.org/show_bug.cgi?id=105095

--- Comment #1 from Roland Scheidegger <sroland@vmware.com> ---
Is that BARTS specific?
My piglit runs with Juniper (HD 5750) show this test passing (and generally
there's no difference in the driver between these two chips).
(Albeit I never ran it with this specific mesa version, you could try mesa
git.)

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[Bug 105095] piglit arb_vertex_type_2_10_10_10_rev-array_types failed for BARTS

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https://bugs.freedesktop.org/show_bug.cgi?id=105095

--- Comment #2 from Roland Scheidegger <sroland@vmware.com> ---
FWIW this looks very similar to a bug recently fixed for radv.
Probably not so coincidentally, radeonsi has workarounds for 2/10/10/10 signed
formats, apparently gcn hw before vega (with the exception of stoney ridge) has
a bug interpreting the 2bit alpha as unsigned. The output from this test would
be consistent with that (alpha 1.0 as 2 bit snorm would be 0x01, whereas that
value interpreted as unorm would be 0.333).
So maybe the same bug could affect later evergreen hw as well.

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[Bug 105095] piglit arb_vertex_type_2_10_10_10_rev-array_types failed for BARTS

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https://bugs.freedesktop.org/show_bug.cgi?id=105095

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #3 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/629.

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