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115 lines
2.7 KiB
Plaintext
115 lines
2.7 KiB
Plaintext
//
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// Atari2600.m
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// CLK
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//
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// Created by Thomas Harte on 14/07/2015.
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// Copyright © 2015 Thomas Harte. All rights reserved.
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//
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#import "CSAtari2600.h"
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#import "Atari2600.hpp"
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@interface CSAtari2600 (Callbacks)
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- (void)crtDidEndFrame:(CRTFrame *)frame didDetectVSync:(BOOL)didDetectVSync;
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@end
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struct Atari2600CRTDelegate: public Outputs::CRT::CRTDelegate {
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__weak CSAtari2600 *atari;
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void crt_did_end_frame(Outputs::CRT *crt, CRTFrame *frame, bool did_detect_vsync) { [atari crtDidEndFrame:frame didDetectVSync:did_detect_vsync]; }
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};
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typedef NS_ENUM(NSInteger, CSAtari2600RunningState) {
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CSAtari2600RunningStateRunning,
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CSAtari2600RunningStateStopped
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};
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@implementation CSAtari2600 {
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Atari2600::Machine _atari2600;
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Atari2600CRTDelegate _crtDelegate;
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dispatch_queue_t _serialDispatchQueue;
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int _frameCount;
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int _hitCount;
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BOOL _didDecideRegion;
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NSConditionLock *_runningLock;
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}
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- (void)crtDidEndFrame:(CRTFrame *)frame didDetectVSync:(BOOL)didDetectVSync {
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if(!_didDecideRegion)
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{
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_frameCount++;
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_hitCount += didDetectVSync ? 1 : 0;
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if(_frameCount > 30)
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{
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if(_hitCount < _frameCount >> 1)
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{
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_atari2600.switch_region();
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_didDecideRegion = YES;
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}
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if(_hitCount > (_frameCount * 7) >> 3)
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{
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_didDecideRegion = YES;
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}
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}
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}
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BOOL hasReturn = [self.view pushFrame:frame];
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if(hasReturn)
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_atari2600.get_crt()->return_frame();
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}
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- (void)runForNumberOfCycles:(int)cycles {
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if([_runningLock tryLockWhenCondition:CSAtari2600RunningStateStopped]) {
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[_runningLock unlockWithCondition:CSAtari2600RunningStateRunning];
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dispatch_async(_serialDispatchQueue, ^{
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[_runningLock lockWhenCondition:CSAtari2600RunningStateRunning];
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_atari2600.run_for_cycles(cycles);
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[_runningLock unlockWithCondition:CSAtari2600RunningStateStopped];
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});
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}
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}
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- (void)setROM:(NSData *)rom {
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dispatch_async(_serialDispatchQueue, ^{
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_atari2600.set_rom(rom.length, (const uint8_t *)rom.bytes);
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});
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}
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- (void)setState:(BOOL)state forDigitalInput:(Atari2600DigitalInput)digitalInput {
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dispatch_async(_serialDispatchQueue, ^{
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_atari2600.set_digital_input(digitalInput, state ? true : false);
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});
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}
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- (void)setResetLineEnabled:(BOOL)enabled {
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dispatch_async(_serialDispatchQueue, ^{
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_atari2600.set_reset_line(enabled ? true : false);
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});
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}
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- (void)setView:(CSCathodeRayView *)view {
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_view = view;
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_view.signalDecoder = [NSString stringWithUTF8String:_atari2600.get_signal_decoder()];
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}
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- (instancetype)init {
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self = [super init];
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if (self) {
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_crtDelegate.atari = self;
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_atari2600.get_crt()->set_delegate(&_crtDelegate);
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_serialDispatchQueue = dispatch_queue_create("Atari 2600 queue", DISPATCH_QUEUE_SERIAL);
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_runningLock = [[NSConditionLock alloc] initWithCondition:CSAtari2600RunningStateStopped];
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}
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return self;
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}
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@end
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