mirror of
https://github.com/mkwong98/HDNes.git
synced 2024-05-20 13:07:54 -04:00
171 lines
3.1 KiB
C++
171 lines
3.1 KiB
C++
#pragma once
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#define FC4STEP1 7456 //3728 * 2 cpu cycles
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#define FC4STEP2 14912 //7456 * 2
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#define FC4STEP3 22370 //11185 * 2
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#define FC4STEP4 29828 //14914 * 2
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#define FC5STEP1 7456 //3728 * 2 cpu cycles
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#define FC5STEP2 14912 //7456 * 2
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#define FC5STEP3 22370 //11185 * 2
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#define FC5STEP4 29828 //14914 * 2
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#define FC5STEP5 37280 //18640 * 2
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#define CHANNEL_SQUARE1 0
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#define CHANNEL_SQUARE2 1
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#define CHANNEL_TRIANGLE 2
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#define CHANNEL_NOISE 3
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#define CHANNEL_DMC 4
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struct lenCounter{
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bool enabled;
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bool halted;
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Uint16 currentVal;
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Uint16 length;
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};
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struct envelope{
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bool startFlag;
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bool disableDecay;
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bool loop;
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Uint8 dividerPeriod;
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Uint8 dividerCounter;
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Uint8 counter;
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Uint8 constVol;
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};
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struct sweep{
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bool enabled;
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bool reload;
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Uint8 dividerPeriod;
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Uint8 dividerCounter;
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bool negate;
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Uint8 shift;
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Uint16 targetPeriod;
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};
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class apu
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{
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public:
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Uint8 reg[0x16];
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Uint32 curCycle;
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lenCounter lc[5];
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Uint16 channelPeriod[5];
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Uint8 vol[5];
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Uint8 lcLoadValue[0x20];
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Uint8 dutyCycle[4][8];
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Uint8 triCycle[32];
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Uint16 noiseLen[16];
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Uint16 dmcRate[16];
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apu(void);
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~apu(void);
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void init();
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void reset();
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void runCatchUp(unsigned int cycle);
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Uint8 readReg(Uint8 address);
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void writeReg(Uint8 address, Uint8 data);
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//sq1
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envelope sq1Env;
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sweep sq1Sweep;
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Uint8 sq1Duty;
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Uint8 sq1SeqCounter;
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Uint16 sq1Timer;
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void write4000(Uint8 data);
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void write4001(Uint8 data);
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void write4002(Uint8 data);
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void write4003(Uint8 data);
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//sq2
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envelope sq2Env;
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sweep sq2Sweep;
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Uint8 sq2Duty;
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Uint8 sq2SeqCounter;
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Uint16 sq2Timer;
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void write4004(Uint8 data);
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void write4005(Uint8 data);
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void write4006(Uint8 data);
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void write4007(Uint8 data);
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//triangle
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lenCounter linearCounter;
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void write4008(Uint8 data);
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void write400A(Uint8 data);
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void write400B(Uint8 data);
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//noise
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envelope noiseEnv;
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bool noiseModeFlag;
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Uint16 shiftReg;
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void write400C(Uint8 data);
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void write400E(Uint8 data);
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void write400F(Uint8 data);
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void shiftNoiseReg();
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//DMC
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bool irqEnabled;
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bool dmcLoop;
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Uint8 dmcCounter;
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Uint8 dmcOutPutRate;
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Uint16 sampleAddress;
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Uint16 sampleLength;
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Uint16 curAddress;
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Uint8 sampleBuffer;
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Uint8 bitsRemaining;
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bool dmcSilence;
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Uint16 dmcPeriodCounter;
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bool newDMCCycle;
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double dmcCounterAcc;
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void write4010(Uint8 data);
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void write4011(Uint8 data);
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void write4012(Uint8 data);
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void write4013(Uint8 data);
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Uint8 apuBuffer[5][APU_BUFFER_SIZE];
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Uint16 apuBufferCounter;
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Uint16 apuBufferFilled;
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double bufferFillClock;
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double apuAccAR[256];
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double apuCounterAcc[5];
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//status
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bool dmcEnabled;
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bool signalDMC;
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Uint16 dmcBytes;
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void write4015(Uint8 data);
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Uint8 read4015();
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bool fcMode5Step;
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bool signalIRQ;
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bool fcInterruptDisable;
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Sint16 fcCycleCounter;
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void write4017(Uint8 data);
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void clockFC1();
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void clockFC2();
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void clockLC();
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void clockSweep1();
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void clockSweep2();
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void clockEnv(envelope &e);
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void clockLinear();
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void resetCycleCount();
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void clockSq1Timer();
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void clockSq2Timer();
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void clockDMC();
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void fillAPUBuffer();
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Uint8 envVol(envelope e);
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void saveState(fstream* statefile);
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void loadState(fstream* statefile);
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};
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