mirror of
https://github.com/NovaSquirrel/Mesen-X.git
synced 2024-06-11 16:57:59 -04:00
310 lines
7.4 KiB
C++
310 lines
7.4 KiB
C++
#pragma once
|
|
#include "stdafx.h"
|
|
#include "Snapshotable.h"
|
|
#include "APU.h"
|
|
#include "BaseExpansionAudio.h"
|
|
#include "SSGAudio.h"
|
|
#include "Console.h"
|
|
#include "CPU.h"
|
|
|
|
#include <array>
|
|
#include "ym3438.h"
|
|
|
|
using EPSMSSGAudio = SSGAudio<AudioChannel::EPSM_L, AudioChannel::EPSM_R>;
|
|
|
|
class EPSMAudio : public EPSMSSGAudio
|
|
{
|
|
private:
|
|
ym3438_t _chip;
|
|
|
|
int16_t _lastOutputs[2];
|
|
int16_t _currentOutputs[2];
|
|
uint8_t writeValue;
|
|
uint16_t writeAddr;
|
|
uint16_t irqATimer;
|
|
uint16_t irqBTimer;
|
|
uint16_t irqACurrentTimer;
|
|
uint16_t irqBCurrentTimer;
|
|
uint8_t irqATimerEnable;
|
|
uint8_t irqBTimerEnable;
|
|
uint8_t irqAHighValue;
|
|
uint8_t irqALowValue;
|
|
uint8_t irqBValue;
|
|
uint8_t irqEnable;
|
|
uint16_t currentRegister;
|
|
|
|
|
|
double _clock;
|
|
double _clockIRQ;
|
|
double _cycleCountIRQ = 0;
|
|
|
|
static constexpr uint8_t cycleCount = 24;
|
|
|
|
struct InputEntry
|
|
{
|
|
uint8_t addr = 0;
|
|
uint8_t data = 0;
|
|
uint8_t cycle = 0;
|
|
uint8_t wrote = 0;
|
|
};
|
|
|
|
static constexpr uint8_t INPUT_BUFFER_SIZE = cycleCount;
|
|
using InputBuffer = std::array<InputEntry, INPUT_BUFFER_SIZE>;
|
|
InputBuffer _inputBuffer;
|
|
|
|
void UpdateOutputLevel()
|
|
{
|
|
for (size_t x = 0; x < 2; x++)
|
|
{
|
|
_console->GetApu()->AddExpansionAudioDelta(x == 0 ? AudioChannel::EPSM_L : AudioChannel::EPSM_R, _currentOutputs[x] - _lastOutputs[x]);
|
|
_lastOutputs[x] = _currentOutputs[x];
|
|
}
|
|
}
|
|
|
|
uint8_t GetCurrentCycle() const
|
|
{
|
|
return static_cast<uint8_t>(std::floor(_clock)) % cycleCount;
|
|
}
|
|
|
|
void WriteToChip(uint8_t a, uint8_t d)
|
|
{
|
|
const auto cycle = GetCurrentCycle();
|
|
|
|
if (_inputBuffer[cycle].wrote)
|
|
{
|
|
std::cout << "EPSM CHIP DOUBLE WRITE" << std::endl;
|
|
}
|
|
|
|
_inputBuffer[cycle] = {
|
|
a,
|
|
d,
|
|
cycle,
|
|
true
|
|
};
|
|
}
|
|
|
|
|
|
void WriteToChipIRQ(uint16_t addr, uint8_t value)
|
|
{
|
|
switch (addr) {
|
|
case 0x0:
|
|
case 0x2:
|
|
currentRegister = value;
|
|
break;
|
|
|
|
case 0x1:
|
|
if (irqEnable) {
|
|
if (currentRegister == 0x24) {
|
|
//Timer A High 8 bits
|
|
irqAHighValue = value;
|
|
}
|
|
if (currentRegister == 0x25) {
|
|
//Timer A Low 2 bits
|
|
irqALowValue = (value & 0x3);
|
|
}
|
|
if (currentRegister == 0x26) {
|
|
//Timer B 8 bits
|
|
irqBValue = value;
|
|
}
|
|
if (currentRegister == 0x27) {
|
|
//Load+Enable IRQ (0xA = TimerB, 0x5 = TimerA)
|
|
if ((value & 0x5)) {
|
|
irqATimer = (uint16_t(irqAHighValue) << 2) | irqALowValue;
|
|
irqACurrentTimer = 72 * (1024 - irqATimer) * 2;
|
|
irqATimerEnable = 1;
|
|
}
|
|
if ((value & 0xA)) {
|
|
irqBTimer = 1152 * (256 - irqBValue) * 2;
|
|
irqBCurrentTimer = irqBTimer;
|
|
irqBTimerEnable = 1;
|
|
}
|
|
if ((value & 0x10)) {
|
|
//Enable/Reset IRQ
|
|
_console->GetCpu()->ClearIrqSource(IRQSource::EPSM);
|
|
irqATimerEnable = 0;
|
|
}
|
|
if ((value & 0x20)) {
|
|
//Enable/Reset IRQ
|
|
_console->GetCpu()->ClearIrqSource(IRQSource::EPSM);
|
|
irqBTimerEnable = 0;
|
|
}
|
|
}
|
|
}
|
|
if (currentRegister == 0x29) {
|
|
//std::cout << std::hex << "value: " << value << std::endl;
|
|
if ((value & 0x3 && (value & 0x80))) {
|
|
//if ((value & 0x3 )) {
|
|
//enable IRQ's
|
|
//std::cout << "enable IRQ's" << std::endl;
|
|
irqEnable = 1;
|
|
}
|
|
if (!(value & 0x83)) {
|
|
//enable IRQ's
|
|
//std::cout << "enable IRQ's" << std::endl;
|
|
irqEnable = 0;
|
|
_console->GetCpu()->ClearIrqSource(IRQSource::EPSM);
|
|
irqATimerEnable = 0;
|
|
irqBTimerEnable = 0;
|
|
}
|
|
}
|
|
break;
|
|
case 0x3:
|
|
/*if (currentRegister == 0x10) {
|
|
std::cout << "0x10" << std::endl;
|
|
}*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
uint32_t getClockFrequency()
|
|
{
|
|
return _console->GetSettings()->GetEPSMClockFrequency() / 6;
|
|
}
|
|
|
|
protected:
|
|
void StreamState(bool saving) override
|
|
{
|
|
EPSMSSGAudio::StreamState(saving);
|
|
|
|
ArrayInfo<int16_t> lastOutputs{ _lastOutputs, 2 };
|
|
ArrayInfo<int16_t> currentOutputs{ _currentOutputs, 2 };
|
|
ArrayInfo<InputBuffer> inputBuffer{ &_inputBuffer };
|
|
ValueInfo<ym3438_t> chip{ &_chip };
|
|
ValueInfo<double> clock { &_clock };
|
|
Stream(lastOutputs, currentOutputs, inputBuffer, chip, clock);
|
|
}
|
|
|
|
void ClockAudio() override
|
|
{
|
|
EPSMSSGAudio::ClockAudio();
|
|
|
|
_clock += getClockFrequency() / (double)_console->GetCpu()->GetClockRate(_console->GetModel());
|
|
_clockIRQ += _console->GetSettings()->GetEPSMClockFrequency() / (double)_console->GetCpu()->GetClockRate(_console->GetModel());
|
|
while (_clockIRQ >= _cycleCountIRQ) {
|
|
_cycleCountIRQ++;
|
|
if (irqATimerEnable) {
|
|
irqACurrentTimer--;
|
|
if (!irqACurrentTimer) {
|
|
irqACurrentTimer++;
|
|
_console->GetCpu()->SetIrqSource(IRQSource::EPSM);
|
|
}
|
|
|
|
}
|
|
if (irqBTimerEnable) {
|
|
irqBCurrentTimer--;
|
|
if (!irqBCurrentTimer) {
|
|
irqBCurrentTimer++;
|
|
_console->GetCpu()->SetIrqSource(IRQSource::EPSM);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
while (_clock >= cycleCount)
|
|
{
|
|
for (uint8_t x = 0; x < 2; x++)
|
|
{
|
|
_currentOutputs[x] = 0;
|
|
}
|
|
|
|
for (uint8_t cycle = 0; cycle < cycleCount; cycle++)
|
|
{
|
|
_clock--;
|
|
|
|
int16_t samples[4];
|
|
OPN2_Clock(&_chip, samples);
|
|
|
|
for (uint8_t x = 0; x < 2; x++)
|
|
{
|
|
_currentOutputs[x] += samples[x];
|
|
_currentOutputs[x] += samples[x+2]/8;
|
|
}
|
|
|
|
auto& input = _inputBuffer[cycle];
|
|
if(input.wrote)
|
|
{
|
|
input.wrote = false;
|
|
OPN2_Write(&_chip, input.addr, input.data);
|
|
}
|
|
}
|
|
|
|
for (uint8_t x = 0; x < 2; x++)
|
|
{
|
|
_currentOutputs[x] /= 5;
|
|
}
|
|
|
|
UpdateOutputLevel();
|
|
}
|
|
}
|
|
|
|
virtual uint32_t GetSSGClockFrequency() override
|
|
{
|
|
return EPSMSSGAudio::GetSSGClockFrequency() * (_console->GetSettings()->GetEPSMClockFrequency() / 3579545 );
|
|
}
|
|
|
|
public:
|
|
EPSMAudio(shared_ptr<Console> console) : EPSMSSGAudio(console)
|
|
{
|
|
memset(_lastOutputs, 0, sizeof(_lastOutputs));
|
|
memset(_currentOutputs, 0, sizeof(_currentOutputs));
|
|
_inputBuffer = {};
|
|
|
|
_clock = 0;
|
|
_clockIRQ = 0;
|
|
irqEnable = 0;
|
|
|
|
irqATimerEnable = 0;
|
|
irqBTimerEnable = 0;
|
|
OPN2_Reset(&_chip);
|
|
OPN2_SetChipType(0);
|
|
}
|
|
|
|
void WriteRegister(uint16_t addr, uint8_t value, uint8_t custom = 0, uint8_t epsmA0 = 0, uint8_t epsmA1 = 0)
|
|
{
|
|
if (!custom) {
|
|
switch (addr) {
|
|
case 0x4016:
|
|
if ((value & 0x0F) == 0x02) {writeAddr = 0x0;} //A0 = 0, A1 = 0
|
|
if ((value & 0x0F) == 0x0A) {writeAddr = 0x1;} //A0 = 1, A1 = 0
|
|
if ((value & 0x0F) == 0x06) {writeAddr = 0x2;} //A0 = 0, A1 = 1
|
|
if ((value & 0x0F) == 0x0E) {writeAddr = 0x3;} //A0 = 1, A1 = 1
|
|
if (value & 0x0E) {writeValue = value;}
|
|
if ((value & 0x0F) == 0x00) {
|
|
writeValue = (writeValue & 0xF0) | (value >> 4);
|
|
|
|
const uint8_t a0 = !!(writeAddr & 0x1);
|
|
const uint8_t a1 = !!(writeAddr & 0x2);
|
|
if (a0 == 0x0) { writeAddr = 0xC000; }
|
|
if (a0 == 0x1) { writeAddr = 0xE000; }
|
|
if (a1 == 0x0) { EPSMSSGAudio::WriteRegister(writeAddr, writeValue); }
|
|
WriteToChip(a0 | (a1 << 1), writeValue);
|
|
WriteToChipIRQ(a0 | (a1 << 1), writeValue);
|
|
}
|
|
break;
|
|
case 0x401c: //0xC000 A0 = 0, A1 = 0
|
|
case 0x401d: //0xE000 A0 = 1, A1 = 0
|
|
case 0x401e: //0xC002 A0 = 0, A1 = 1
|
|
case 0x401f: //0xE002 A0 = 1, A1 = 1
|
|
|
|
const uint8_t a0 = !!(addr & 0x1); //const uint8_t a0 = (addr & 0xF000) == 0xE000;
|
|
const uint8_t a1 = !!(addr & 0x2); //const uint8_t a1 = !!(addr & 0xF);
|
|
if (a0 == 0x0) { addr = 0xC000; }
|
|
if (a0 == 0x1) { addr = 0xE000; }
|
|
if (a1 == 0x0) { EPSMSSGAudio::WriteRegister(addr, value); }
|
|
WriteToChip(a0 | (a1 << 1), value);
|
|
WriteToChipIRQ(a0 | (a1 << 1), value);
|
|
|
|
break;
|
|
}
|
|
}
|
|
else{
|
|
if (epsmA0 == 0x0) { addr = 0xC000; }
|
|
if (epsmA0 == 0x1) { addr = 0xE000; }
|
|
if (epsmA1 == 0x0) { EPSMSSGAudio::WriteRegister(addr, value); }
|
|
WriteToChip(epsmA0 | (epsmA1 << 1), value);
|
|
WriteToChipIRQ(epsmA0 | (epsmA1 << 1), value);
|
|
}
|
|
|
|
}
|
|
};
|