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Starts towards an implementation of time warping.

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This commit is contained in:
Thomas Harte 2020-02-04 23:08:54 -05:00
parent e1cbad0b6d
commit 14d976eecb
1 changed files with 36 additions and 5 deletions
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41
OSBindings/Mac/Clock Signal/Machine/CSMachine.mm
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@ -153,7 +153,9 @@ struct ActivityObserver: public Activity::Observer {
CSHighPrecisionTimer *_timer;
CGSize _pixelSize;
std::atomic_flag is_updating;
std::atomic_flag _isUpdating;
int64_t _syncTime;
double _refreshPeriod;
std::unique_ptr<Outputs::Display::OpenGL::ScanTarget> _scanTarget;
}
@ -207,7 +209,7 @@ struct ActivityObserver: public Activity::Observer {
_speakerDelegate.machineAccessLock = _delegateMachineAccessLock;
_joystickMachine = _machine->joystick_machine();
is_updating.clear();
_isUpdating.clear();
}
return self;
}
@ -705,11 +707,14 @@ struct ActivityObserver: public Activity::Observer {
#pragma mark - Timer
- (void)openGLView:(CSOpenGLView *)view didUpdateDisplayLink:(CVDisplayLinkRef)displayLink {
_refreshPeriod = CVDisplayLinkGetActualOutputVideoRefreshPeriod(displayLink);
NSLog(@"Refresh period: %0.5f (%0.5f)", _refreshPeriod, 1.0 / _refreshPeriod);
}
- (void)openGLViewDisplayLinkDidFire:(CSOpenGLView *)view {
CGSize pixelSize = view.backingSize;
@synchronized(self) {
_syncTime = std::chrono::high_resolution_clock::now().time_since_epoch().count();
_pixelSize = pixelSize;
}
[self.view performWithGLContext:^{
@ -725,22 +730,48 @@ struct ActivityObserver: public Activity::Observer {
_timer = [[CSHighPrecisionTimer alloc] initWithTask:^{
const auto timeNow = std::chrono::high_resolution_clock::now().time_since_epoch().count();
const auto duration = timeNow - lastTime;
lastTime = timeNow;
CGSize pixelSize;
int64_t syncTime;
@synchronized(self) {
syncTime = self->_syncTime;
// If this tick includes vsync then inspect the machine.
BOOL splitAndSync = NO;
if(timeNow >= self->_syncTime && lastTime < self->_syncTime) {
// Grab the scan status and check out the machine's current frame time.
// If it's stable and within 3% of a non-zero integer multiple of the
// display rate, consider an adjustment.
const auto scan_status = self->_machine->crt_machine()->get_scan_status();
if(scan_status.field_duration_gradient < 0.00001) {
auto ratio = self->_refreshPeriod / scan_status.field_duration;
if(ratio > 1.5) {
ratio = fmod(ratio, 1.0);
if(ratio < 0.5) ratio += 1.0;
}
splitAndSync = ratio <= 1.03 && ratio >= 0.97;
// if(splitAndSync) {
// NSLog(@"+: %0.3f %0.3f [%0.5f]", scan_status.field_duration / self->_refreshPeriod, ratio, scan_status.field_duration_gradient);
// } else {
// NSLog(@"-: %0.3f %0.3f [%0.5f]", scan_status.field_duration / self->_refreshPeriod, ratio, scan_status.field_duration_gradient);
// }
} // else NSLog(@"e");
}
self->_machine->crt_machine()->run_for((double)duration / 1e9);
pixelSize = self->_pixelSize;
}
if(!self->is_updating.test_and_set()) {
if(!self->_isUpdating.test_and_set()) {
dispatch_async(dispatch_get_global_queue(QOS_CLASS_USER_INTERACTIVE, 0), ^{
[self.view performWithGLContext:^{
self->_scanTarget->update((int)pixelSize.width, (int)pixelSize.height);
} flushDrawable:NO];
self->is_updating.clear();
self->_isUpdating.clear();
});
}
lastTime = timeNow;
} interval:uint64_t(1000000000) / uint64_t(TICKS)];
}