[Mesa-dev] [Bug 78914] [llvmpipe] Front/Backfaces do not cover the same pixels when rasterized

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78914

--- Comment #15 from Roland Scheidegger <sroland at vmware.com> ---
Ok turns out this is indeed an interpolation problem. Depth test is enabled and
it just happens that for these failing fragments probably due to interpolation
precision issues the depth test fails. At least if I nuke depth testing it no
longer shows this. This may or may not be a valid bug (not entirely sure if
this is a legitimate case of floating point rounding errors, we could however
near certainly do a better job with interpolation), but in any case I'm afraid
I can't fix this for now.
Rasterization itself is just fine.

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