[Bug 38936] New: Stardock games need terrain/model height coordinate correction

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38936

            Bug ID: 38936
           Summary: Stardock games need terrain/model height coordinate
                    correction
           Product: Wine
           Version: 1.7.47
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: unsuspicious.fakename+wine at gmail.com
      Distribution: ---

Created attachment 51871
  --> https://bugs.winehq.org/attachment.cgi?id=51871
WINEDEBUG=+d3d wine SorcererKing (first and last 5k lines; cropped ~1GB in the
middle)

Same problem in Stardock's "Fallen Enchantress" and successor game "Sorcerer
King" (seems to use the same engine).

Draws the terrain above everything else. The tops of some models actually stick
out of the floor, doesn't flicker or anything, so this does not just look like
a typical problem with buffers / drawing order or something.

>From the otherwise "cleanness" of the rendering it looks a bit like a well
contained coordinate system conversion error or something like that. As if
terrain and models use different methods of adjusting their z or centres in the
vertex shaders... and one of them has an offset +/-1 that doesn't work in wine
for some reason. 


( Tested using wine versions starting from ~2 years ago up to & including
1.7.47. I used "staging" for the log only - because I don't have debug symbols
for vanilla wine at all )

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