[Bug 88642] Trilinear sampling on cubemap wrongly sampled at the border of rasterized triangle on HAWAII

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88642

            Bug ID: 88642
           Summary: Trilinear sampling on cubemap wrongly sampled at the
                    border of rasterized triangle on HAWAII
           Product: Mesa
           Version: 10.4
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: vljn at ovi.com
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 112566
  --> https://bugs.freedesktop.org/attachment.cgi?id=112566&action=edit
Test case

Hi,

on a R290X with a fresh fedora 21 install (Mesa 10.4.1) a fragment shader
sampling a cubemap texture with trilinear filtering is not correctly executed
on the edge of rasterized triangles.

I've included a patch against piglit that display the behaviour. On my system
the test display a small orange diagonal line on top of the color pattern. 
(the test doesn't check result atm)

I think it's related to some quad pattern : in my app that has a depth buffer
the line follows the edge of the geometry.

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