mirror of
https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
113 lines
No EOL
2.7 KiB
C++
113 lines
No EOL
2.7 KiB
C++
#pragma once
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#include "pch.h"
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#include "NES/BaseMapper.h"
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#include "NES/Mappers/Konami/VrcIrq.h"
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#include "NES/Mappers/Audio/Vrc7Audio.h"
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class VRC7 : public BaseMapper
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{
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private:
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unique_ptr<Vrc7Audio> _audio;
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unique_ptr<VrcIrq> _irq;
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uint8_t _controlFlags = 0;
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uint8_t _chrRegisters[8] = {};
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void UpdatePrgRamAccess()
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{
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SetCpuMemoryMapping(
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0x6000,
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0x7FFF,
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0,
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HasBattery() ? PrgMemoryType::SaveRam : PrgMemoryType::WorkRam,
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(_controlFlags & 0x80) ? MemoryAccessType::ReadWrite : MemoryAccessType::NoAccess
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);
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}
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protected:
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uint16_t GetPrgPageSize() override { return 0x2000; }
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uint16_t GetChrPageSize() override { return 0x0400; }
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bool EnableCpuClockHook() override { return true; }
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void InitMapper() override
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{
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_audio.reset(new Vrc7Audio(_console));
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_irq.reset(new VrcIrq(_console));
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_irq->Reset();
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_controlFlags = 0;
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memset(_chrRegisters, 0, sizeof(_chrRegisters));
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SelectPrgPage(3, -1);
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UpdateState(); //disable wram, set mirroring mode
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}
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void Reset(bool softReset) override
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{
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_audio->Reset();
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}
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void Serialize(Serializer& s) override
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{
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BaseMapper::Serialize(s);
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SV(_controlFlags);
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SVArray(_chrRegisters, 8);
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SV(_irq);
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SV(_audio);
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if(!s.IsSaving()) {
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UpdateState();
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}
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}
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void ProcessCpuClock() override
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{
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BaseProcessCpuClock();
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_irq->ProcessCpuClock();
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_audio->Clock();
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}
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void UpdateState()
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{
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switch(_controlFlags & 0x03) {
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case 0: SetMirroringType(MirroringType::Vertical); break;
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case 1: SetMirroringType(MirroringType::Horizontal); break;
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case 2: SetMirroringType(MirroringType::ScreenAOnly); break;
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case 3: SetMirroringType(MirroringType::ScreenBOnly); break;
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}
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UpdatePrgRamAccess();
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_audio->SetMuteAudio((_controlFlags & 0x40) != 0);
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}
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void WriteRegister(uint16_t addr, uint8_t value) override
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{
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if(addr & 0x10 && (addr & 0xF010) != 0x9010) {
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addr |= 0x08;
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addr &= ~0x10;
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}
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switch(addr & 0xF038) {
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case 0x8000: SelectPrgPage(0, value & 0x3F); break;
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case 0x8008: SelectPrgPage(1, value & 0x3F); break;
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case 0x9000: SelectPrgPage(2, value & 0x3F); break;
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case 0x9010: case 0x9030: _audio->WriteReg(addr, value); break;
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case 0xA000: SelectChrPage(0, value); break;
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case 0xA008: SelectChrPage(1, value); break;
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case 0xB000: SelectChrPage(2, value); break;
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case 0xB008: SelectChrPage(3, value); break;
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case 0xC000: SelectChrPage(4, value); break;
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case 0xC008: SelectChrPage(5, value); break;
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case 0xD000: SelectChrPage(6, value); break;
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case 0xD008: SelectChrPage(7, value); break;
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case 0xE000: _controlFlags = value; UpdateState(); break;
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case 0xE008: _irq->SetReloadValue(value); break;
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case 0xF000: _irq->SetControlValue(value); break;
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case 0xF008: _irq->AcknowledgeIrq(); break;
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}
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}
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}; |