[Bug 82463] i965: Using EWA algorithm for isotropic case

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82463

--- Comment #9 from Iago Toral <itoral at igalia.com> ---
(In reply to Iago Toral from comment #8)
> For reference, the proposed patch was discussed in the mesa-dev mailing list:
> http://lists.freedesktop.org/archives/mesa-dev/2014-August/065332.html

The patch was dropped because it regressed a bunch of piglit tests. I have run
piglit again with this patch and this still happens. The list of regressed
tests is: 

tex-miplevel-selection textureprojgradoffset 1d_projvec4
tex-miplevel-selection textureprojgrad 2d_projvec4
tex-miplevel-selection *gradarb 2d
tex-miplevel-selection textureprojgrad 1d
tex-miplevel-selection texturegradoffset 1d
tex-miplevel-selection textureprojgradoffset 2d
tex-miplevel-selection texturegrad 1d
tex-miplevel-selection textureprojgrad 1d_projvec4
tex-miplevel-selection textureprojgradoffset 1d
tex-miplevel-selection *projgradarb 1d_projvec4
tex-miplevel-selection *projgradarb 1d
tex-miplevel-selection texturegradoffset 1darray
tex-miplevel-selection texturegradoffset 2darray
tex-miplevel-selection *gradarb 1d
tex-miplevel-selection texturegrad 1darray
tex-miplevel-selection *projgradarb 2d
tex-miplevel-selection texturegrad 2d
tex-miplevel-selection textureprojgradoffset 2d_projvec4
tex-miplevel-selection *projgradarb 2d_projvec4
tex-miplevel-selection textureprojgrad 2d
tex-miplevel-selection texturegradoffset 2d
tex-miplevel-selection texturegrad 2darray

In the cases where this fails the reported problem is related with a wrong
texture level selection (off by one level in all failed cases):

Failure:
  Expected level: 1
  Observed level: 2
  Fetch level: 0, baselevel: 0, maxlevel: 2, minlod: 0, maxlod: 4, bias: 1,
mipfilter: yes

This happens in ~101 out of 2637 test cases in each of the reported tests.

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