[Nouveau] [Bug 91551] New: DXTn compressed normal maps produce severe artifacts on all NV5x and NVDx chipsets

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91551

            Bug ID: 91551
           Summary: DXTn compressed normal maps produce severe artifacts
                    on all NV5x and NVDx chipsets
           Product: Mesa
           Version: 10.6
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: issor.oruam at gmail.com
        QA Contact: nouveau at lists.freedesktop.org

Created attachment 117508
  --> https://bugs.freedesktop.org/attachment.cgi?id=117508&action=edit
Snapshot of the artifacts with normal map

Light blue garbled artifacts are affecting gallium nouveau on FreeSpace2 open
source, with Star Wars : Original Trilogy mod.

To Star Wars fans this may be unacceptable :-), so let't try to find clues to
the problem

I have checked the .dds normal map's texture compression format and in this mod
it's always DXT5

If I disable 'normal maps' in wxLauncher there are no artifacts, but there are
also no maps, which are one the beauties of the mod.

Affected chipsets NV6x (GeForce 7025) NV8x (GeForce 8500, 8600), NV9x (GeForce
9600GT, GT120) , NVAx (GeForce 210) and NVDx (GeForce GT610). (cheched mesa
with 10.6.x)

Unaffected, meaning normal maps are fine with those: NVCx and NVEx chipsets
(checked with mesa 10.6.x and 11.0.0devel git)

NOTE: It's strange that NVDx chipsets are affected, if they rely on nvc0 driver

You can find in the attachment the snapshot of the artifacts with normal maps
and  normal maps disabled (no artifacts), plus other log files/extracts.

Mauro

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