[Bug 90221] Triangle boundary artifact on Shadow Warrior game - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 90221] Triangle boundary artifact on Shadow Warrior game
Date: Tue, 28 Apr 2015 23:12:47 +0000	[thread overview]
Message-ID: <bug-90221-502@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=90221

            Bug ID: 90221
           Summary: Triangle boundary artifact on Shadow Warrior game
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: lvella@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 115419
  --> https://bugs.freedesktop.org/attachment.cgi?id=115419&action=edit
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)

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