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https://github.com/SourMesen/Mesen2.git
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116 lines
2.3 KiB
C++
116 lines
2.3 KiB
C++
#pragma once
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#include "NES/NesConsole.h"
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#include "NES/NesCpu.h"
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#include "Utilities/Audio/ymfm/ymfm_opn.h"
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#include "Utilities/ISerializable.h"
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#include "Utilities/Serializer.h"
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class OpnInterface : public ymfm::ymfm_interface, public ISerializable
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{
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public:
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static constexpr uint32_t ClockRate = 8000000;
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private:
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ymfm::ymf288 _opn;
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NesConsole* _console = nullptr;
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vector<uint8_t> _adpcmRom;
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uint32_t _timers[2] = {};
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uint32_t _busyCounter = 0;
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public:
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OpnInterface(NesConsole* console, vector<uint8_t>& adpcmRom) : _opn(*this)
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{
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_adpcmRom = adpcmRom;
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//Ensure the size is 8kb
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_adpcmRom.resize(0x2000);
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_console = console;
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_opn.set_fidelity(ymfm::OPN_FIDELITY_MED);
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_opn.reset();
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}
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void ymfm_set_busy_end(uint32_t clocks) override
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{
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_busyCounter = clocks;
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}
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uint8_t ymfm_external_read(ymfm::access_class type, uint32_t address) override
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{
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if(type == ymfm::access_class::ACCESS_ADPCM_A) {
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return _adpcmRom[address];
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} else {
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return 0;
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}
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}
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bool ymfm_is_busy() override
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{
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return _busyCounter != 0;
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}
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void ymfm_set_timer(uint32_t timerId, int32_t duration) override
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{
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_timers[timerId] = duration < 0 ? 0 : (uint32_t)duration;
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}
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void ymfm_update_irq(bool irqEnabled) override
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{
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if(irqEnabled) {
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_console->GetCpu()->SetIrqSource(IRQSource::Epsm);
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} else {
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_console->GetCpu()->ClearIrqSource(IRQSource::Epsm);
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}
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}
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void Exec()
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{
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if(_busyCounter) {
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_busyCounter--;
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}
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if(_timers[0] && --_timers[0] == 0) {
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m_engine->engine_timer_expired(0);
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}
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if(_timers[1] && --_timers[1] == 0) {
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m_engine->engine_timer_expired(1);
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}
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}
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void Write(uint8_t addr, uint8_t value)
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{
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_opn.write(addr, value);
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}
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uint32_t GetSampleRate()
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{
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return _opn.sample_rate(OpnInterface::ClockRate);
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}
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void GenerateSamples(vector<int16_t>& samples)
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{
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ymfm::ymf288::output_data output;
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_opn.generate(&output, 1);
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samples.push_back(output.data[0] + (output.data[2] >> 2));
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samples.push_back(output.data[1] + (output.data[2] >> 2));
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}
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void Serialize(Serializer& s) override
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{
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vector<uint8_t> opnData;
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ymfm::ymfm_saved_state state = ymfm::ymfm_saved_state(opnData, s.IsSaving());
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SVArray(_timers, 2);
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SV(_busyCounter);
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if(s.IsSaving()) {
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_opn.save_restore(state);
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SVVector(opnData);
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} else {
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SVVector(opnData);
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_opn.save_restore(state);
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}
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}
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};
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