Hello,
just wanted to let you know that with Wine 0.9.37, Sim City 4 is running successfully in DirectX mode for the first time in the 3 years I've been playing it under Wine. Previously, to be able to play at all, one had to force the game to use OpenGL calls. The visual artifacts triggered by scrolling the map under that mode are now gone under DirectX as well. So all in all great work :)
The only issue remaining seems to be related to the Z-buffer. Cars and pedestrians are always drawn on top of buildings. See http://bugs.winehq.org/show_bug.cgi?id=7260#c3
Regards,