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)