[Bug 42979] Age of Empires hangs for several seconds between screens when CSMT is enabled

https://bugs.winehq.org/show_bug.cgi?id=42979

--- Comment #3 from Henri Verbeet  ---
(In reply to Matteo Bruni from comment #2)
> Yeah, that's because currently there are no wined3d_swapchain_present()
> calls in ddraw games and thus the command stream is allowed to buffer a lot
> of frames in its queue (i.e. the check at the end of
> wined3d_cs_emit_present() isn't triggered).

Yeah. Note though that unless DDBLT_ASYNC is set (or implied), blits will have
a similar effect. It's a little speculative, but this may come down to
correctly implementing DDBLT_WAIT/DDBLT_DONOTWAIT and
ddraw_surface7_GetBltStatus().