[Bug 28363] New: [r600c, kms, tiling] shadows wrong in doom3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28363

           Summary: [r600c, kms, tiling] shadows wrong in doom3
           Product: DRI
           Version: XOrg CVS
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: liquid.acid at gmx.net


Hi there,

I'm using the most recent drm-radeon-testing kernel which incorporates the
r6xx+ tiling patchset. Both the ddx and mesa are patched so that tiling is used
(ColorTiling=true in xorg.conf).

Both ddx and mesa are also git master (plus the patches, like stated before).

Just tried the doom3 demo and noticed that the shadows are not rendered
correctly, probably some issue with stencil buffering.

Should be reproducable with this version of the demo:
doom3-linux-1.3.1.1304.x86.run

Played around a bit with the ingame graphics settings, but ramping the quality
up and down doesn't have any effect on the issue (when not completly disabling
the shadows). Looks like it always uses the same approach, I think it was
called Carmack's reverse.

Performance is quite good and I don't see any other obvious rendering issues,
so fixing the stencil stuff would make d3 a 'perfectly playable' game on the
OSS driver :)

Greets,
Tobias

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