[Bug 89643] dEQP-GLES3: dfdx/dfdy precision errors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89643

--- Comment #1 from Iago Toral <itoral at igalia.com> ---
Created attachment 114426
  --> https://bugs.freedesktop.org/attachment.cgi?id=114426&action=edit
Sample program reproducing the problem

This renders a quad with two triangles. The fragment shader will compute a
derivative like the dEQP tests and use the result as the output color (so it
should be all black if no precision errors are present). If there is a
precision error > 1.0e-8 for a fragment it will render that fragment in green.

The output shows how one of the two triangles is rendered in black and the
other one has plenty of fragments in green.

The test program uses libglm.

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