[Bug 29518] New: [r300g] [regression] Depth clamping broke Regnum Online

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Aug 11 15:28:08 PDT 2010


           Summary: [r300g] [regression] Depth clamping broke Regnum
           Product: Mesa
           Version: git
          Platform: Other
               URL: http://www.regnumonline.com.ar/
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/r300
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: sa at whiz.se

Created an attachment (id=37802)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=37802)
Screenshot of RO

Lately I have noticed that the game Regnum Online have regressed, it has never
worked perfectly (see bug 28847) but now it's only rendering garbage.

Bisecting leads to this:

ca7ead03da4481cd34933175898f4a924e588ad4 is the first bad commit
commit ca7ead03da4481cd34933175898f4a924e588ad4
Author: Marek Olšák <maraeo at gmail.com>
Date:   Tue Jul 20 16:37:22 2010 +0200

    r300g: implement depth clamp

    Depth clamping seems to be implicit if clipping is disabled.

    It's not perfect, but it's good enough for wine and passes
    the corresponding piglit tests.

:040000 040000 2c23739a006e4151928169bfb4da12b323c4d2c7
bcd5168351aa7e5b75ed39bdea8e7e7eb5caf2ed M    src

I have confirmed the problem by reverting said commit.

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