[Bug 109725] piglit.spec.arb_cull_distance regressions

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109725

            Bug ID: 109725
           Summary: piglit.spec.arb_cull_distance regressions
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: bisected, regression
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: jason at jlekstrand.net
          Reporter: mark.a.janes at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

The following tests regressed:

piglit.spec.arb_cull_distance.basic-cull-4
piglit.spec.arb_cull_distance.basic-cull-2
piglit.spec.arb_cull_distance.basic-cull-3
piglit.spec.arb_cull_distance.basic-cull-1
piglit.spec.arb_cull_distance.vs-cull-distance-vertex-inside-cull-volume
piglit.spec.arb_cull_distance.vs-cull-distance-vertex-outside-cull-volume
piglit.spec.arb_cull_distance.fs-cull-distance-interpolated
piglit.spec.arb_cull_distance.vs-cull-distance-vertex-on-plane
KHR-GL33.cull_distance.functional
KHR-GL46.cull_distance.functional

Bisected to:

4e69fba534e7377f3bc6c40c73e6bc5c23437d4e
Author:     Jason Ekstrand <jason at jlekstrand.net>

nir: Rewrite lower_clip_cull_distance_arrays to do a lot less lowering

Instead of going to all the work of to combine them into one array, just
make two arrays and use location_frac to colocate them within CLIP0.
Then the back-end can sort things out and stack them on top of each
other.  Thanks to ef99f4c8, we also don't need to set compact anymore.

Reviewed-by: Alejandro Piñeiro <apinheiro at igalia.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

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