Ummm... which other models are you refering to? I'm told that Windows does it globally. Having per-surface syncing may mean you end up syncing more often. Eg. Render with HW to one surface then to another, then if you render to SW to both of those surfaces, two syncs happen. Doing it globally would have resulted in only one sync call.
Unless you can truely checkpoint every rendering operation, anything other than global syncing is going to result in more sync calls. The more I think about going away from global syncing, the more this sounds like a bad idea.
It may result in more sync calls, but it should also result in less time spent waiting in each call. If you HW render to surface A, then B, then need to SW render to surface A, you don't need to wait for the HW to finish with surface B.
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