Bug 104290

Summary:	Multisampling gives corrupt rendering
Product:	Mesa	Reporter:	maister
Component:	Drivers/Vulkan/radeon	Assignee:	mesa-dev
Status:	RESOLVED FIXED	QA Contact:	mesa-dev
Severity:	normal
Priority:	medium
Version:	17.3
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	Noisy output

Description maister 2017-12-16 14:38:52 UTC

Created attachment 136218 [details]
Noisy output

Repro:
https://github.com/ARM-software/vulkan-sdk/tree/master/samples/multisampling

Checkout, build (cmake -DPLATFORM=wayland/xcb) and run ./samples/multisampling/multisampling

There is some weird noise in the output when rendering with multisampling shown in screenshot at certain angles.

GPU: RX470.
I'm not sure which versions are affected, but it affects at least:
Name            : vulkan-radeon
Version         : 17.3.0-2
Description     : Radeon's Vulkan mesa driver

as packaged in Arch.

Comment 1 maister 2017-12-16 14:39:52 UTC

./samples/rotating_texture/rotating_texture is basically the exact same thing, but does not have this issue.

Comment 2 Bas Nieuwenhuizen 2017-12-29 23:21:38 UTC

This should be fixed by

commit cebc9a119d44cb5b2b3bd5e262452e112b75fea2
Author: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Date:   Mon Dec 25 14:27:28 2017 +0100

    radv: Flush caches before subpass resolve.
    
    Fixes: f4e499ec791 "radv: add initial non-conformant radv vulkan driver"
    Reviewed-by: Dave Airlie <airlied@redhat.com>

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