80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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#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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class Dance2000 : public BaseMapper
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{
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private:
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uint8_t _prgReg;
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uint8_t _mode;
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uint8_t _lastNt;
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protected:
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bool AllowRegisterRead() override { return true; }
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uint16_t GetPRGPageSize() override { return 0x4000; }
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uint16_t GetCHRPageSize() override { return 0x1000; }
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void InitMapper() override
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{
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_prgReg = _mode = _lastNt = 0;
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AddRegisterRange(0x5000, 0x5FFF, MemoryOperation::Write);
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RemoveRegisterRange(0x8000, 0xFFFF, MemoryOperation::Write);
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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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Stream(_mode, _prgReg, _lastNt);
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}
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void NotifyVRAMAddressChange(uint16_t addr) override
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{
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if(_mode & 0x02) {
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if((addr & 0x3000) == 0x2000) {
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uint32_t currentNametable = (addr >> 11) & 0x01;
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if(currentNametable != _lastNt) {
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_lastNt = currentNametable;
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SelectCHRPage(0, _lastNt);
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}
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}
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} else {
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if(_lastNt != 0) {
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_lastNt = 0;
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SelectCHRPage(0, _lastNt);
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}
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}
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}
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void UpdateState()
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{
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SelectCHRPage(0, _lastNt);
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SelectCHRPage(1, 1);
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if(_mode & 0x04)
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SelectPrgPage2x(0, (_prgReg & 0x07) << 1);
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else {
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SelectPRGPage(0, _prgReg & 0x0F);
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SelectPRGPage(1, 0);
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}
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SetMirroringType(_mode & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical);
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}
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uint8_t ReadRegister(uint16_t addr) override
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{
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return (_prgReg & 0x40) ? MemoryManager::GetOpenBus() : InternalReadRam(addr);
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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 == 0x5000) {
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_prgReg = value;
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UpdateState();
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} else if(addr == 0x5200) {
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_mode = value;
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if(_mode & 0x04) {
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UpdateState();
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}
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}
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}
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};
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