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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #16 from Iago Toral <itoral at igalia.com> ---
Created attachment 114249
  --> https://bugs.freedesktop.org/attachment.cgi?id=114249&action=edit
texgrad piglit test rendering result (with patches)

This shows the result (in master) of the piglit test:

bin/arb_shader_texture_lod-texgrad -auto -fbo

Rendering with texture and textureGrad are not the same. If we remove patch 1/2
so that we don't lower textureGrad to compute LOD manually, then both
renderings look like the one on the left, which are different from the
renderings we obtain with master.

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