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Author SHA1 Message Date
Keith Packard 4f3c37a1f1 present: Round fake MSC computations intead of truncating 
If the timer fired too early, we'd sometimes mis-compute the MSC for
fake vblanks. Rounding the computation to the nearest MSC fixes this nicely.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
 2013-11-20 13:12:22 -08:00
Keith Packard 5c5c1b7798 present: Add Present extension 
Provides both a software implementation using timers and driver hooks
to base everything on vblank intervals.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
 2013-10-31 16:59:18 -07:00