[Bug 14609] New: Some DirectX vector math functions need to take a copy of the input vector.

http://bugs.winehq.org/show_bug.cgi?id=14609

Summary: Some DirectX vector math functions need to take a copy
                    of the input vector.
           Product: Wine
           Version: 1.1.1
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: directx-d3d
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
                CC: [e-mail]

Hi,

A friend (CC'd) reports that WINE's D3DXVec3TransformCoord()
[dlls/d3dx8/math.c:1226] is producing different output to the native Windows
version. He narrowed the problem down to the function not taking a copy of the
input vector when the input vector and the output vector pointers are the same.

In TransformCoord(), when pout == pv, pout->x and pout->y are written and then
used immediately through pv->x and pv->y, respectively, resulting in completely
skewed output.

This most likely effects many other D3DXVec* functions too.