WineD3D: Implement depth copy from onscreen to offscreen surface when depth fixup is used

[Frank Richter]

On 06.03.2008 09:23, H. Verbeet wrote:
> Aside from that, depth stencil copying is broken (in that it doesn't
> always copy when it should, and sometimes copies when it shouldn't).
> I've got a patch that fixes this, but it causes regressions. Changing
> anything in the depth copying code would cause some nasty conflicts in
> my patch. Of course if you're interested in tracking down regressions
> I'd be happy to send you the patch.

Well, depends what games/apps regress. If I possess them, I might take a 
shot.

-f.r.