Bug 90221

Summary:	Triangle boundary artifact on Shadow Warrior game
Product:	Mesa	Reporter:	Lucas <lvella>
Component:	Drivers/Gallium/radeonsi	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:	Default DRI bug account <dri-devel>
Severity:	normal
Priority:	medium	CC:	lvella
Version:	git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	Wall with light effect triggering the artifact.

Description Lucas 2015-04-28 23:12:47 UTC

Created attachment 115419 [details]
Wall with light effect triggering the artifact.

On game Shawdow Warrior, with Southern Island chip, drivers from this PPA: https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers

Experienced both on Ubuntu 14.10 and, after upgrade, on Ubuntu 15.04.

Some special effects trigger a visible artifact on triangle primitive boundaries, probably, see screenshot attached. With fglrx, the issue is not present.

It seems the problem is on some post-processing shader, because, as can be seen in the screenshot, the visible triangles does not respect the boundary of scene objects, and if I move the mouse, they are fixed relative to the screen.

Running with the following env var (otherwise the game is unplayable slow on current video settings):
R600_DEBUG=sb

Relevant info from glxinfo:
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD TAHITI
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.6.0-devel (git-7f5a8ac 2015-04-25 utopic-oibaf-ppa)
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)

Comment 1 Michel Dänzer 2015-04-30 03:25:06 UTC

(In reply to Lucas from comment #0)
> Some special effects trigger a visible artifact on triangle primitive
> boundaries, probably, see screenshot attached.

Looks like bug 88642, which is fixed in current LLVM.


> Running with the following env var (otherwise the game is unplayable slow on
> current video settings):
> R600_DEBUG=sb

That environment variable has no effect with the radeonsi driver.

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