[Bug 93292] "Thea: The Awakening" world map textures not rendered (blue background)

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=93292

            Bug ID: 93292
           Summary: "Thea: The Awakening" world map textures not rendered
                    (blue background)
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: glogow@fbihome.de
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 120410
  --> https://bugs.freedesktop.org/attachment.cgi?id=120410&action=edit
Thea with interface only world map

The problematic game can be downloaded from the link in the first message in
the following steam thread or via the steam beta channel (DRM free, free for
Linux):
https://steamcommunity.com/app/378720/discussions/0/490125737485986607?fp=2#p1

Someone else with older AMD hardware reported the same problem in the linked
communty thread. My hardware is:
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
RV710/M92 [Mobility Radeon HD 4530/4570/545v]

When starting the actual gameplay, only the interface is rendered but not the
games world map, basically rendering the game unplayable (see attached image).

I'm on Ubuntu Trusty 14.04, 3.13 kernel. This happens with stock Mesa from the
Ubuntu release and with the git release from the oibaf PPA:
https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers

The apitrace is too large to upload for me (1.5 GB), but doesn't show a
particular error, except for an early glClear without a context; even the
trimmed one is 1,25GB. xz compressed is still 620MB.

The game renders correctly when started with "LIBGL_ALWAYS_SOFTWARE=1". I
confirmed this by also rendering the apitrace in software. imirkin told me on
IRC, that this actually is a bug in the r600 driver.

I've compiled Mesa git packages with "--enable-debug" and can test a patch, if
needed. I'm jmux on freenode and will be lingering around in the channel for
some time and normally can be found in the libreoffice-dev channel.

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