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Ensured that no backlog accumulates of cycles to run. Otherwise the background queue was lagging behind.

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This commit is contained in:
Thomas Harte 2015-08-18 21:13:54 -04:00
parent ca6b54536e
commit 462a791ed3
1 changed files with 16 additions and 3 deletions
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19
OSBindings/Mac/Clock Signal/CSAtari2600.mm
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@ -18,6 +18,11 @@ struct Atari2600CRTDelegate: public Outputs::CRT::CRTDelegate {
void crt_did_end_frame(Outputs::CRT *crt, CRTFrame *frame, bool did_detect_vsync) { [atari crtDidEndFrame:frame didDetectVSync:did_detect_vsync]; }
};
typedef NS_ENUM(NSInteger, CSAtari2600RunningState) {
CSAtari2600RunningStateRunning,
CSAtari2600RunningStateStopped
};
@implementation CSAtari2600 {
Atari2600::Machine _atari2600;
Atari2600CRTDelegate _crtDelegate;
@ -27,6 +32,8 @@ struct Atari2600CRTDelegate: public Outputs::CRT::CRTDelegate {
int _frameCount;
NSTimeInterval _startTimeInterval;
BOOL _didDecideRegion;
NSConditionLock *_runningLock;
}
- (void)crtDidEndFrame:(CRTFrame *)frame didDetectVSync:(BOOL)didDetectVSync {
@ -66,9 +73,14 @@ struct Atari2600CRTDelegate: public Outputs::CRT::CRTDelegate {
}
- (void)runForNumberOfCycles:(int)cycles {
dispatch_async(_serialDispatchQueue, ^{
_atari2600.run_for_cycles(cycles);
});
if([_runningLock tryLockWhenCondition:CSAtari2600RunningStateStopped]) {
[_runningLock unlockWithCondition:CSAtari2600RunningStateRunning];
dispatch_async(_serialDispatchQueue, ^{
[_runningLock lockWhenCondition:CSAtari2600RunningStateRunning];
_atari2600.run_for_cycles(cycles);
[_runningLock unlockWithCondition:CSAtari2600RunningStateStopped];
});
}
}
- (void)setROM:(NSData *)rom {
@ -96,6 +108,7 @@ struct Atari2600CRTDelegate: public Outputs::CRT::CRTDelegate {
_crtDelegate.atari = self;
_atari2600.get_crt()->set_delegate(&_crtDelegate);
_serialDispatchQueue = dispatch_queue_create("Atari 2600 queue", DISPATCH_QUEUE_SERIAL);
_runningLock = [[NSConditionLock alloc] initWithCondition:CSAtari2600RunningStateStopped];
}
return self;