Bug 102390

Summary:	centroid interpolation causes broken attribute values
Product:	Mesa	Reporter:	timon <timon37>
Component:	Drivers/Vulkan/radeon	Assignee:	mesa-dev
Status:	RESOLVED FIXED	QA Contact:	mesa-dev
Severity:	normal
Priority:	medium
Version:	git
Hardware:	All
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description timon 2017-08-24 15:10:00 UTC

If I add the the centroid interpolation decoration to any attribute:
- the values will be mostly broken (maybe just the first vertex in each triangle is ok? hard to tell)
- and there will be block-like screen-space artifacts flickering all over the geometry

I can't provide a screenshot unfortunately.
My GPU: [AMD/ATI] Bonaire XTX [Radeon R7 260X/360] PCI ID 1002:6658
Running with the amdgpu kernel module, linux 4.12.8.

Comment 1 timon 2017-08-24 15:12:46 UTC

(In reply to timon from comment #0)
> If I add the the centroid interpolation decoration to any attribute:
> - the values will be mostly broken

To clarify the values for that attribute only, the rest are fine.
Also this happens when running without MSAA (can't test with atm).

Comment 2 Samuel Pitoiset 2018-04-10 20:12:07 UTC

Hi timon,

Can you still reproduce the problem? If so, can you attach a simple test case?

Thanks!

Comment 3 Samuel Pitoiset 2018-05-21 11:59:33 UTC

I think the original report was correct and the issue should most likely be fixed in master with https://cgit.freedesktop.org/mesa/mesa/commit/?id=73df16dcee79e2281c8d8a830dbbe6655359c82d

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