[Bug 81020] New: [radeonsi][regresssion] Wireframe of background rendered through objects in Half-Life 2: Episode 2 with MSAA enabled

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=81020

          Priority: medium
            Bug ID: 81020
          Assignee: dri-devel@lists.freedesktop.org
           Summary: [radeonsi][regresssion] Wireframe of background
                    rendered through objects in Half-Life 2: Episode 2
                    with MSAA enabled
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: daniel@constexpr.org
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/Gallium/radeonsi
           Product: Mesa

Created attachment 102395
  --> https://bugs.freedesktop.org/attachment.cgi?id=102395&action=edit
Wireframe rendered above foreground geometry (8xMSAA)

Black pixels along the wireframe of background geometry is rendered in front of
foreground geometry (even UI). The wireframe isn't visible all the time but
instead flickers as if there is some kind of race condition.

This is reproducible with all MSAA levels that can be set in the game (2x, 4x,
6x and 8x) - however with 2x and 4xMSAA, the wireframe is white instead of
black. Wit MSAA disabled everything is rendered correctly.


Happens as of commit f6db414f3ca2d692f262e3f5a38d4fcedbdf4f4f, does not happen
with mesa 10.2.2.

Bisecting blames commit 501fee2511a0a84303319a5e3deacf4959da5b08
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Tue May 6 13:48:11 2014 +0200

    radeonsi: implement set_min_samples

    This is how per-sample shading is enabled.


GPU: Radeon HD 7950 (OpenGL renderer string: Gallium 0.4 on AMD TAHITI)
LLVM compiled from svn today (r202464)
GCC: 4.8.3
Distro: Gentoo

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