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https://github.com/SourMesen/Mesen2.git
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75 lines
1.7 KiB
C++
75 lines
1.7 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/A12Watcher.h"
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#include "NES/NesCpu.h"
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#include "NES/BaseNesPpu.h"
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class Mapper35 : public BaseMapper
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{
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private:
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uint8_t _irqCounter = 0;
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bool _irqEnabled = false;
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A12Watcher _a12Watcher;
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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 EnableVramAddressHook() override { return true; }
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void InitMapper() override
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{
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_irqEnabled = false;
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_irqCounter = 0;
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SelectPrgPage(3, -1);
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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(_a12Watcher);
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SV(_irqCounter);
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SV(_irqEnabled);
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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 & 0xF007) {
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case 0x8000: case 0x8001: case 0x8002: case 0x8003:
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SelectPrgPage(addr & 0x03, value);
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break;
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case 0x9000: case 0x9001: case 0x9002: case 0x9003:
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case 0x9004: case 0x9005: case 0x9006: case 0x9007:
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SelectChrPage(addr & 0x07, value);
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break;
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case 0xC002:
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_irqEnabled = false;
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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break;
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case 0xC003: _irqEnabled = true; break;
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case 0xC005: _irqCounter = value; break;
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case 0xD001:
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SetMirroringType(value & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical);
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break;
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}
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}
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void NotifyVramAddressChange(uint16_t addr) override
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{
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//MMC3-style A12 IRQ counter
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if(_a12Watcher.UpdateVramAddress(addr, _console->GetPpu()->GetFrameCycle()) == A12StateChange::Rise) {
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if(_irqEnabled) {
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_irqCounter--;
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if(_irqCounter == 0) {
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_irqEnabled = false;
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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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}
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};
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