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https://github.com/SourMesen/Mesen.git
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115 lines
3.4 KiB
C++
115 lines
3.4 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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#include "MemoryManager.h"
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#include "CPU.h"
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class CityFighter : public BaseMapper
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{
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private:
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uint8_t _prgReg;
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uint8_t _prgMode;
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uint8_t _mirroring;
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uint8_t _chrRegs[8];
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bool _irqEnabled;
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uint16_t _irqCounter;
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protected:
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uint16_t GetPRGPageSize() override { return 0x2000; }
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uint16_t GetCHRPageSize() override { return 0x400; }
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void InitMapper() override
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{
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_prgReg = 0;
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_prgMode = 0;
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_mirroring = 0;
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_irqCounter = 0;
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_irqEnabled = false;
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memset(_chrRegs, 0, sizeof(_chrRegs));
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UpdateState();
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}
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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> chrRegs { _chrRegs, 8 };
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Stream(_prgReg, _prgMode, _mirroring, _irqEnabled, _irqCounter, chrRegs);
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}
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void UpdateState()
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{
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SelectPrgPage4x(0x8000, _prgReg);
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if(!_prgMode) {
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SelectPRGPage(2, _prgReg);
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}
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for(int i = 0; i < 8; i++) {
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SelectCHRPage(i, _chrRegs[i]);
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}
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switch(_mirroring) {
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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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}
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void ProcessCpuClock() override
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{
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if(_irqEnabled) {
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_irqCounter--;
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if(_irqCounter == 0) {
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_console->GetCpu()->SetIrqSource(IRQSource::External);
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}
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}
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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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switch(addr & 0xF00C) {
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case 0x9000:
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_prgReg = value & 0x0C;
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_mirroring = value & 0x03;
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break;
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case 0x9004: case 0x9008: case 0x900C:
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if(addr & 0x800) {
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_console->GetMemoryManager()->Write(0x4011, (value & 0x0F) << 3, MemoryOperationType::Write);
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} else {
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_prgReg = value & 0x0C;
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}
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break;
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case 0xC000: case 0xC004: case 0xC008: case 0xC00C:
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_prgMode = value & 0x01;
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break;
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case 0xD000: _chrRegs[0] = (_chrRegs[0] & 0xF0) | (value & 0x0F); break;
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case 0xD004: _chrRegs[0] = (_chrRegs[0] & 0x0F) | (value << 4); break;
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case 0xD008: _chrRegs[1] = (_chrRegs[1] & 0xF0) | (value & 0x0F); break;
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case 0xD00C: _chrRegs[1] = (_chrRegs[1] & 0x0F) | (value << 4); break;
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case 0xA000: _chrRegs[2] = (_chrRegs[2] & 0xF0) | (value & 0x0F); break;
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case 0xA004: _chrRegs[2] = (_chrRegs[2] & 0x0F) | (value << 4); break;
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case 0xA008: _chrRegs[3] = (_chrRegs[3] & 0xF0) | (value & 0x0F); break;
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case 0xA00C: _chrRegs[3] = (_chrRegs[3] & 0x0F) | (value << 4); break;
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case 0xB000: _chrRegs[4] = (_chrRegs[4] & 0xF0) | (value & 0x0F); break;
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case 0xB004: _chrRegs[4] = (_chrRegs[4] & 0x0F) | (value << 4); break;
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case 0xB008: _chrRegs[5] = (_chrRegs[5] & 0xF0) | (value & 0x0F); break;
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case 0xB00C: _chrRegs[5] = (_chrRegs[5] & 0x0F) | (value << 4); break;
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case 0xE000: _chrRegs[6] = (_chrRegs[6] & 0xF0) | (value & 0x0F); break;
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case 0xE004: _chrRegs[6] = (_chrRegs[6] & 0x0F) | (value << 4); break;
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case 0xE008: _chrRegs[7] = (_chrRegs[7] & 0xF0) | (value & 0x0F); break;
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case 0xE00C: _chrRegs[7] = (_chrRegs[7] & 0x0F) | (value << 4); break;
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case 0xF000: _irqCounter = ((_irqCounter & 0x1E0) | ((value & 0x0F) << 1)); break;
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case 0xF004: _irqCounter = ((_irqCounter & 0x1E) | ((value & 0x0F) << 5)); break;
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case 0xF008:
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_irqEnabled = (value & 0x02) != 0;
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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break;
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}
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UpdateState();
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}
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}; |