> I guess I'm proposing some sort of X extension that allows a 
> particular X request to be tagged as "synced to vblank." For example a 
> XCopyArea request could be preceded by another request (call it 
> XRequestVerticalSync) that indicates to the server that the operation 
> shouldn't be performed until a vblank period.

If one knew the time until vblank, one could simply wait that time,
and then do a xsync.

It could really be that simple.

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