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Fixes sign of arithmetic.

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This commit is contained in:
Thomas Harte 2020-11-29 20:23:33 -05:00
parent 11fe8ab6db
commit 3da6b4709c
1 changed files with 3 additions and 1 deletions
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4
OSBindings/Mac/Clock Signal/Machine/CSMachine.mm
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@ -720,8 +720,10 @@ struct ActivityObserver: public Activity::Observer {
@synchronized(self) {
// Store a means to map from CVTimeStamp.hostTime to Time::Nanos;
// there is an extremely dodgy assumption here that the former is in ns.
// If you can find a well-defined way to get the CVTimeStamp.hostTime units,
// whether at runtime or via preprocessor define, I'd love to know about it.
if(!_timeDiff) {
_timeDiff = int64_t(now->hostTime) - int64_t(timeNow);
_timeDiff = int64_t(timeNow) - int64_t(now->hostTime);
}
// Store the next end-of-frame time. TODO: and start of next and implied visible duration, if raster racing?