[Bug 15345] New: RTK XI: Graphics corruption until zbuffer depth is changed

http://bugs.winehq.org/show_bug.cgi?id=15345

Summary: RTK XI: Graphics corruption until zbuffer depth is
                    changed
           Product: Wine
           Version: 1.1.5
          Platform: PC
               URL: http://rotk.co.uk/demo/RTK-XI-Demo.exe
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: directx-d3d
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Steps to reproduce:

* Download and install the demo.
* Start the game with wine "RTK XI Demo.exe"
* Start the "Country Basics" tutorial
* Click through the conversation
* Scroll around until you get obviously corrupted graphics, like in my first
picture. May be right away, may be after scrolling/zooming/panning a bit. Not
completely reproducible.
* Go into options, change the z depth of the game resolution (1024x768x32x16 to
1024x768x32x24, for example)
* Corruption is gone.

... something using uninitialized data? Perhaps we provide an uncleared buffer
to the game of some sort?

Nvidia 7950/G71, drivers 169.12. No native dlls, the game seems to be using
plain d3d9.