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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #10 from Iago Toral <itoral at igalia.com> ---
Notice that all the affected tests use gradients and there is this comment in
from the HSW specs (as explained also in the bug report):

"When EWA used for non-anisotropic filtering and the coordinates have zero
derivative the computed LOD is 0 instead of -inf."

So my guess is that this is only expected to work when the texture gradients
meet certain conditions...

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