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https://github.com/SourMesen/Mesen.git
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119 lines
2.9 KiB
C++
119 lines
2.9 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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#include "VrcIrq.h"
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class T230 : public BaseMapper
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{
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private:
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unique_ptr<VrcIrq> _irq;
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uint8_t _prgReg0;
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uint8_t _prgReg1;
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uint8_t _prgMode;
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uint16_t _outerBank;
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uint8_t _hiCHRRegs[8];
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uint8_t _loCHRRegs[8];
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protected:
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virtual uint16_t GetPRGPageSize() override { return 0x2000; }
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virtual uint16_t GetCHRPageSize() override { return 0x0400; }
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void InitMapper() override
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{
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_irq.reset(new VrcIrq(_console));
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_prgMode = GetPowerOnByte() & 0x01;
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_prgReg0 = GetPowerOnByte() & 0x1F;
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_prgReg1 = GetPowerOnByte() & 0x1F;
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for(int i = 0; i < 8; i++) {
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_loCHRRegs[i] = GetPowerOnByte() & 0x0F;
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_hiCHRRegs[i] = GetPowerOnByte() & 0x1F;
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}
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UpdateState();
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}
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void ProcessCpuClock() override
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{
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_irq->ProcessCpuClock();
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}
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void UpdateState()
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{
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if(_chrRamSize) {
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SelectChrPage8x(0, 0);
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} else {
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for(int i = 0; i < 8; i++) {
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SelectCHRPage(i, _loCHRRegs[i] | (_hiCHRRegs[i] << 4));
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}
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}
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if(_prgMode == 0) {
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SelectPRGPage(0, _prgReg0 | _outerBank);
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SelectPRGPage(2, (-2 & 0x1F) | _outerBank);
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} else {
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SelectPRGPage(0, (-2 & 0x1F) | _outerBank);
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SelectPRGPage(2, _prgReg0 | _outerBank);
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}
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SelectPRGPage(1, _prgReg1);
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SelectPRGPage(3, -1);
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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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addr = (addr & 0xF000) | (addr & 0x2A ? 0x02 : 0) | (addr & 0x15 ? 0x01 : 0);
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if(addr >= 0x9000 && addr <= 0x9001) {
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switch(value) {
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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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} else if(addr >= 0x9002 && addr <= 0x9003) {
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_prgMode = (value >> 1) & 0x01;
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} else if(addr >= 0xA000 && addr <= 0xA003) {
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_prgReg0 = (value & 0x1F) << 1;
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_prgReg1 = ((value & 0x1F) << 1) | 0x01;
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} else if(addr >= 0xB000 && addr <= 0xE003) {
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if(_chrRamSize > 0) {
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_outerBank = (value & 0x08) << 2;
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} else {
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uint8_t regNumber = ((((addr >> 12) & 0x07) - 3) << 1) + ((addr >> 1) & 0x01);
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bool lowBits = (addr & 0x01) == 0x00;
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if(lowBits) {
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//The other reg contains the low 4 bits
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_loCHRRegs[regNumber] = value & 0x0F;
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} else {
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//One reg contains the high 5 bits
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_hiCHRRegs[regNumber] = value & 0x1F;
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}
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}
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} else if(addr == 0xF000) {
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_irq->SetReloadValueNibble(value, false);
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} else if(addr == 0xF001) {
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_irq->SetReloadValueNibble(value, true);
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} else if(addr == 0xF002) {
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_irq->SetControlValue(value);
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} else if(addr == 0xF003) {
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_irq->AcknowledgeIrq();
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}
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UpdateState();
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}
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public:
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void StreamState(bool saving) override
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{
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BaseMapper::StreamState(saving);
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ArrayInfo<uint8_t> loChrRegs = { _loCHRRegs, 8 };
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ArrayInfo<uint8_t> hiChrRegs = { _hiCHRRegs, 8 };
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SnapshotInfo irq { _irq.get() };
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Stream(_prgReg0, _prgReg1, _prgMode, loChrRegs, hiChrRegs, irq);
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}
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}; |