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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED NOTABUG - dEQP-GLES3.functional.shaders.derivate.dfdx.fbo_float_vec2_highp fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97002#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED NOTABUG - dEQP-GLES3.functional.shaders.derivate.dfdx.fbo_float_vec2_highp fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97002">bug 97002</a>
from <span class="vcard"><a class="email" href="mailto:kenneth@whitecape.org" title="Kenneth Graunke <kenneth@whitecape.org>"> <span class="fn">Kenneth Graunke</span></a>
</span></b>
<pre>I agree with Mark. I don't think we can pass these. It looks like they were
removed from the mustpass list in:
commit ea026b329e6bf73f109cda914c90f08d5f7a5b8d
Author: Pyry Haulos <<a href="mailto:phaulos@google.com">phaulos@google.com</a>>
Date: Tue Jul 21 15:12:53 2015 -0700
Remove highp float FBO dfd*() tests from mustpass
Bug: 22628471
Bug: 22632003
Change-Id: Ia9d2b9a5e04ad317cbcc8782c9efaeedd94a0a58
Sadly, the commit messages offer no explanation as to why, and I believe those
bug IDs are for a Google-internal bug tracker. (I suppose we could ask Pyry.)
Having looked around for documentation that could explain the problems, I found
<a href="https://hsdes.intel.com/appstore/article/#/1208680029/main">https://hsdes.intel.com/appstore/article/#/1208680029/main</a>
which indicates that the Intel Android team isn't planning on fixing these
tests either.
I found another HSD somewhere which suggested this comes down to numerical
imprecision when interpolating inputs, and that testing dFdx is hard. I'm
guessing that Skylake must have gotten a little better in that regard; these
tests fail on both Broadwell and Haswell, despite us using the exact same code.
So I don't think we can fix this. Someone will probably want to follow up with
the WebGL conformance developers and Google developers and remove tests ported
from blacklisted dEQP tests.
Sorry :(</pre>
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