[Bug 94668] [IVB, BYT] Cube/3D sampling broken for INT/UINT formats

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94668

            Bug ID: 94668
           Summary: [IVB, BYT] Cube/3D sampling broken for INT/UINT
                    formats
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: kenneth at whitecape.org
        QA Contact: intel-3d-bugs at lists.freedesktop.org
            Blocks: 94448

The following tests fail on IVB and BYT:

dEQP-GLES3.functional.shaders.texture_functions.texturegrad.usamplercube_vertex
dEQP-GLES3.functional.shaders.texture_functions.texturegrad.usamplercube_fragment
dEQP-GLES3.functional.shaders.texture_functions.texturelod.usamplercube_vertex
dEQP-GLES3.functional.shaders.texture_functions.texturelod.usamplercube_fragment

This appears to be because the i965 driver fails to work around a hardware bug.

>From the Ivybridge PRM, Volume 4 Part 1, pages 128-130:
"If the Surface Format of the associated surface is UINT or SINT, the Surface
Type cannot be SURFTYPE_3D or SURFTYPE_CUBE and Address Control Mode cannot be
CLAMP_BORDER or HALF_BORDER."

This appears to apply to the sample, sample+killpix, sample_b, sample_l, and
sample_d messages.

According to Intel internal documentation, this errata applies to IVB and HSW. 
Nobody ever mentions BYT, but the IVB comment likely applies.  However, the
above tests all pass on my Haswell, so I don't think it applies there.

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