[Bug 42930] New: Graphical glitches in "Giants Citizen Kabuto"

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=42930

            Bug ID: 42930
           Summary: Graphical glitches in "Giants Citizen Kabuto"
           Product: Wine
           Version: 2.7
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: directx-d3d
          Assignee: wine-bugs at winehq.org
          Reporter: jnvsor at gmail.com
      Distribution: ---

Created attachment 58080
  --> https://bugs.winehq.org/attachment.cgi?id=58080
Graphical glitches

There's a fairly heavy graphical bug in my GOG version of "Giants Citizen
Kabuto" - this occurs in both normal and staging all the way down to 1.6 and
probably further.

While this happens the game spams this error message: "Zero length vector"

It makes sense. You can't see in the screenshot but it looks more like random
vertices are being randomly moved and the triangles are dragged all over the
place.

Strangely, this is related to another issue. People seem to have issues with
mouse responsiveness in GCK. I've experienced this too. Whenever I start the
game I have a random chance of getting either the graphical glitches or the
mouse issues, but both don't occur at the same time.

While wine complains about the game wanting a double backbuffer, using a
patched wine with double backbuffer enabled doesn't fix the problem.

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