New subject: [Bug 23621] DDraw surface reference counting doesn't match Windows (causes Recoil to fail)

12 Jul 2010


      http://bugs.winehq.org/show_bug.cgi?id=23621
Summary: DDraw surface reference counting doesn't match Windows
                    (causes Recoil to fail)
           Product: Wine
           Version: unspecified
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: directx-ddraw
        AssignedTo: wine-bugs@winehq.org
        ReportedBy: kazade@gmail.com
I just realized there is no bug report covering this issue.
DirectDraw surfaces (and other COM interfaces) maintain a reference count so
that they are destroyed when they are no longer in use. The refcount is
returned by the IUnknown_Release function. Unfortunately some games base logic
on the value returned by IDirectDrawSurface_Release. Specifically they
sometimes (wrongly) expect the return to be zero.
Something like:
if(IDirectDrawSurface_Release(surf)) {
  //Bail out
}
We can test this by forcing DDS_Release to return zero. One game that is
affected is Recoil which complains about not being to set the video mode.
The difference between Wine's implementation and the Windows implementation is
Windows maintains a refcount for each surface interface version (1, 2, 3, 4 and
7) whereas Wine has one reference count across all versions. There are tests in
dlls/ddraw/dsurface.c that confirm the Windows behaviour. To fix this issue the
reference counting needs to be split, which requires a lot of changes (as
versions 1, 2 and 3 all share the same thunks).
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[Bug 23621] New: DDraw surface reference counting doesn't match Windows (causes Recoil to fail)