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82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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#include "VsControlManager.h"
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class VsSystem : public BaseMapper
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{
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private:
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uint8_t _prgChrSelectBit = 0;
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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 0x2000; }
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virtual uint32_t GetWorkRamSize() override { return 0x800; }
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virtual void InitMapper() override
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{
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//Force VS system if mapper 99 (since we assume VsControlManager exists below)
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if(_prgSize >= 0x10000) {
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//Assume DualSystem if PRG ROM is 64kb or larger
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_gameSystem = GameSystem::VsDualSystem;
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} else {
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_gameSystem = GameSystem::VsUniSystem;
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}
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//"Note: unlike all other mappers, an undersize mapper 99 image implies open bus instead of mirroring."
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//However, it doesn't look like any game actually rely on this behavior? So not implemented for now.
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uint8_t prgOuter = _console->IsMaster() ? 0 : (GetPRGPageCount() / 2);
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SelectPRGPage(0, 0 | prgOuter);
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SelectPRGPage(1, 1 | prgOuter);
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SelectPRGPage(2, 2 | prgOuter);
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SelectPRGPage(3, 3 | prgOuter);
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uint8_t chrOuter = _console->IsMaster() ? 0 : (GetCHRPageCount() / 2);
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SelectCHRPage(0, 0 | chrOuter);
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}
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void Reset(bool softReset) override
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{
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BaseMapper::Reset(softReset);
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UpdateMemoryAccess(0);
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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(_prgChrSelectBit);
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}
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void ProcessCpuClock() override
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{
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VsControlManager* controlManager = dynamic_cast<VsControlManager*>(_console->GetControlManager());
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if(_prgChrSelectBit != controlManager->GetPrgChrSelectBit()) {
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_prgChrSelectBit = controlManager->GetPrgChrSelectBit();
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if(_prgSize > 0x8000 && _prgSize < 0x10000) {
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//"Note: In case of games with 40KiB PRG - ROM(as found in VS Gumshoe), the above bit additionally changes 8KiB PRG - ROM at $8000 - $9FFF."
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//"Only Vs. Gumshoe uses the 40KiB PRG variant; in the iNES encapsulation, the 8KiB banks are arranged as 0, 1, 2, 3, 0alternate, empty"
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SelectPRGPage(0, _prgChrSelectBit << 2);
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}
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uint8_t chrOuter = _console->IsMaster() ? 0 : (GetCHRPageCount() / 2);
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SelectCHRPage(0, _prgChrSelectBit | chrOuter);
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}
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}
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public:
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void UpdateMemoryAccess(uint8_t slaveMasterBit)
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{
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shared_ptr<Console> dualConsole = _console->GetDualConsole();
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if(_console->IsMaster() && dualConsole) {
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VsSystem* otherMapper = dynamic_cast<VsSystem*>(dualConsole->GetMapper());
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//Give memory access to master CPU or slave CPU, based on "slaveMasterBit"
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for(int i = 0; i < 4; i++) {
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SetCpuMemoryMapping(0x6000 + i * 0x800, 0x67FF + i * 0x800, _workRam, slaveMasterBit ? MemoryAccessType::ReadWrite : MemoryAccessType::NoAccess);
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otherMapper->SetCpuMemoryMapping(0x6000 + i * 0x800, 0x67FF + i * 0x800, _workRam, slaveMasterBit ? MemoryAccessType::NoAccess : MemoryAccessType::ReadWrite);
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}
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}
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}
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};
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