[Mesa-dev] [Bug 109394] dark lines visual corruption in ground texture with Heroes of the Storm DXVK [supposedly LLVM bug]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109394

--- Comment #6 from Rhys Perry <pendingchaos02+fdobugzilla at gmail.com> ---
I think this is a game bug: it's using implicit derivatives when sampling
textures in non-uniform control flow. In the GLSL and SPIR-V spec, the results
are undefined. I think it's the same with HLSL.

Since the control flow is non-uniform and (IIRC) LLVM seems to move the
operations creating the texture coordinates into it, I think it's causing
discontinuities and messing up the LOD calculation.

-- 
You are receiving this mail because:
You are the assignee for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/mesa-dev/attachments/20190209/126dd308/attachment.html>