mirror of
https://github.com/libretro/Mesen.git
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614 lines
16 KiB
C++
614 lines
16 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "Snapshotable.h"
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#include "IMemoryHandler.h"
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#include "ROMLoader.h"
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#include <assert.h>
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#include "../Utilities/FolderUtilities.h"
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#include "CheatManager.h"
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#include "MessageManager.h"
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enum class PrgMemoryType
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{
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PrgRom,
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SaveRam,
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WorkRam,
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};
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enum MemoryAccessType
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{
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NoAccess = 0x00,
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Read = 0x01,
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Write = 0x02,
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ReadWrite = 0x03
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};
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class BaseMapper : public IMemoryHandler, public Snapshotable, public INotificationListener
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{
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private:
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const uint16_t PrgAddressRangeSize = 0x8000;
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const uint16_t ChrAddressRangeSize = 0x2000;
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MirroringType _mirroringType;
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string _batteryFilename;
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uint16_t InternalGetPrgPageSize()
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{
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//Make sure the page size is no bigger than the size of the ROM itself
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//Otherwise we will end up reading from unallocated memory
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return std::min((uint32_t)GetPRGPageSize(), _prgSize);
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}
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uint16_t InternalGetChrPageSize()
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{
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//Make sure the page size is no bigger than the size of the ROM itself
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//Otherwise we will end up reading from unallocated memory
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return std::min((uint32_t)GetCHRPageSize(), _chrSize);
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}
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protected:
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uint8_t* _prgRom = nullptr;
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uint8_t* _originalPrgRom = nullptr;
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uint8_t* _chrRam = nullptr;
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uint32_t _prgSize = 0;
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uint32_t _chrSize = 0;
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uint8_t* _saveRam = nullptr;
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uint32_t _saveRamSize = 0;
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uint8_t* _workRam = nullptr;
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uint8_t *_nesNametableRam[2];
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uint8_t *_cartNametableRam[2];
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bool _hasChrRam = false;
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bool _hasBattery= false;
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bool _isPalRom = false;
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string _romFilename;
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bool _allowRegisterRead = false;
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uint16_t _registerStartAddress = 0;
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uint16_t _registerEndAddress = 0;
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vector<uint8_t*> _prgPages;
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vector<uint8_t*> _chrPages;
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vector<uint8_t> _prgPageAccessType;
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vector<uint8_t> _chrPageAccessType;
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uint32_t _prgPageNumbers[64];
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uint32_t _chrPageNumbers[64];
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virtual void InitMapper() = 0;
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protected:
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virtual uint16_t GetPRGPageSize() = 0;
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virtual uint16_t GetCHRPageSize() = 0;
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//Save ram is battery backed and saved to disk
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virtual uint32_t GetSaveRamSize() { return 0x2000; }
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virtual uint32_t GetSaveRamPageSize() { return 0x2000; }
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virtual bool ForceBattery() { return false; }
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virtual uint32_t GetChrRamSize() { return 0x2000; }
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//Work ram is NOT saved - aka Expansion ram, etc.
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virtual uint32_t GetWorkRamPageSize() { return 0x2000; }
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virtual uint32_t GetWorkRamSize() { return 0x2000; }
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virtual uint16_t RegisterStartAddress() { return 0x8000; }
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virtual uint16_t RegisterEndAddress() { return 0xFFFF; }
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virtual bool AllowRegisterRead() { return false; }
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virtual void WriteRegister(uint16_t addr, uint8_t value) { }
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virtual uint8_t ReadRegister(uint16_t addr) { return 0; }
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void SetCpuMemoryMapping(uint16_t startAddr, uint16_t endAddr, uint16_t pageNumber, PrgMemoryType type, int8_t accessType = -1)
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{
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#ifdef _DEBUG
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if((startAddr & 0xFF) || (endAddr & 0xFF) != 0xFF) {
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throw new std::runtime_error("Start/End address must be multiples of 256/0x100");
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}
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#endif
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uint8_t* source = nullptr;
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uint32_t pageCount;
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uint32_t pageSize;
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uint8_t defaultAccessType = MemoryAccessType::Read;
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switch(type) {
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case PrgMemoryType::PrgRom:
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source = _prgRom;
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pageCount = GetPRGPageCount();
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pageSize = InternalGetPrgPageSize();
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break;
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case PrgMemoryType::SaveRam:
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source = _saveRam;
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pageCount = _saveRamSize / GetSaveRamPageSize();
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pageSize = GetSaveRamPageSize();
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defaultAccessType |= MemoryAccessType::Write;
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break;
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case PrgMemoryType::WorkRam:
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source = _workRam;
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pageCount = GetWorkRamSize() / GetWorkRamPageSize();
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pageSize = GetWorkRamPageSize();
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defaultAccessType |= MemoryAccessType::Write;
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break;
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default:
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throw new std::runtime_error("Invalid parameter");
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}
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pageNumber = pageNumber % pageCount;
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source = &source[pageNumber * pageSize];
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startAddr >>= 8;
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endAddr >>= 8;
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for(uint16_t i = startAddr; i <= endAddr; i++) {
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_prgPages[i] = source;
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_prgPageAccessType[i] = accessType != -1 ? accessType : defaultAccessType;
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source += 0x100;
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}
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}
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void SetPpuMemoryMapping(uint16_t startAddr, uint16_t endAddr, uint16_t pageNumber, int8_t accessType = -1)
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{
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pageNumber = pageNumber % GetCHRPageCount();
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SetPpuMemoryMapping(startAddr, endAddr, &_chrRam[pageNumber * InternalGetChrPageSize()], accessType);
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}
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void SetPpuMemoryMapping(uint16_t startAddr, uint16_t endAddr, uint8_t* sourceMemory, int8_t accessType = -1)
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{
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#ifdef _DEBUG
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if((startAddr & 0xFF) || (endAddr & 0xFF) != 0xFF) {
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throw new std::runtime_error("Start/End address must be multiples of 256/0x100");
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}
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#endif
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startAddr >>= 8;
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endAddr >>= 8;
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for(uint16_t i = startAddr; i <= endAddr; i++) {
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_chrPages[i] = sourceMemory;
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_chrPageAccessType[i] = accessType != -1 ? accessType : MemoryAccessType::ReadWrite;
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if(sourceMemory != nullptr) {
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sourceMemory += 0x100;
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}
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}
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}
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void RemovePpuMemoryMapping(uint16_t startAddr, uint16_t endAddr)
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{
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//Unmap this section of memory (causing open bus behavior)
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SetPpuMemoryMapping(startAddr, endAddr, nullptr, MemoryAccessType::NoAccess);
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}
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uint8_t InternalReadRam(uint16_t addr)
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{
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return _prgPages[addr >> 8] ? _prgPages[addr >> 8][addr & 0xFF] : 0;
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}
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void SelectPRGPage(uint16_t slot, uint16_t page, PrgMemoryType memoryType = PrgMemoryType::PrgRom)
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{
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_prgPageNumbers[slot] = page;
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if(_prgSize < PrgAddressRangeSize) {
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//Total PRG size is smaller than available memory range, map the entire PRG to all slots
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//i.e same logic as NROM (mapper 0) when PRG is 16kb
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//Needed by "Pyramid" (mapper 79)
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#ifdef _DEBUG
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MessageManager::DisplayMessage("Debug", "PRG size is smaller than 32kb");
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#endif
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for(slot = 0; slot < PrgAddressRangeSize / _prgSize; slot++) {
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uint16_t startAddr = 0x8000 + slot * _prgSize;
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uint16_t endAddr = startAddr + _prgSize - 1;
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SetCpuMemoryMapping(startAddr, endAddr, 0, memoryType);
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}
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} else {
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uint16_t startAddr = 0x8000 + slot * InternalGetPrgPageSize();
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uint16_t endAddr = startAddr + InternalGetPrgPageSize() - 1;
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SetCpuMemoryMapping(startAddr, endAddr, page, memoryType);
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}
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}
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virtual void SelectCHRPage(uint16_t slot, uint16_t page)
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{
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_chrPageNumbers[slot] = page;
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if(_chrSize < ChrAddressRangeSize) {
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//Total CHR size is smaller than available memory range, map the entire CHR to all slots
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//Unsure if any game needs this, but assuming same behavior as PRG in similar situations
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#ifdef _DEBUG
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MessageManager::DisplayMessage("Debug", "CHR size is smaller than 8kb");
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#endif
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for(slot = 0; slot < ChrAddressRangeSize / _chrSize; slot++) {
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uint16_t startAddr = slot * _chrSize;
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uint16_t endAddr = startAddr + _chrSize - 1;
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SetPpuMemoryMapping(startAddr, endAddr, (uint16_t)0, _hasChrRam ? MemoryAccessType::ReadWrite : MemoryAccessType::Read);
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}
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} else {
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uint16_t startAddr = slot * InternalGetChrPageSize();
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uint16_t endAddr = startAddr + InternalGetChrPageSize() - 1;
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SetPpuMemoryMapping(startAddr, endAddr, page, _hasChrRam ? MemoryAccessType::ReadWrite : MemoryAccessType::Read);
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}
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}
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bool HasBattery()
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{
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return _hasBattery;
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}
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void LoadBattery()
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{
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ifstream batteryFile(_batteryFilename, ios::in | ios::binary);
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if(batteryFile) {
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batteryFile.read((char*)_saveRam, _saveRamSize);
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batteryFile.close();
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}
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//Set a default mapping for save ram (this is what most games/mappers use)
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SetCpuMemoryMapping(0x6000, 0x7FFF, 0, PrgMemoryType::SaveRam);
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}
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void SaveBattery()
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{
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ofstream batteryFile(_batteryFilename, ios::out | ios::binary);
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if(batteryFile) {
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batteryFile.write((char*)_saveRam, _saveRamSize);
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batteryFile.close();
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}
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}
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uint32_t GetPRGPageCount()
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{
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return _prgSize / InternalGetPrgPageSize();
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}
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uint32_t GetCHRPageCount()
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{
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return _chrSize / InternalGetChrPageSize();
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}
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string GetBatteryFilename()
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{
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return FolderUtilities::GetSaveFolder() + _romFilename + ".sav";
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}
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void RestoreOriginalPrgRam()
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{
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memcpy(_prgRom, _originalPrgRom, GetPrgSize());
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}
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virtual void StreamState(bool saving)
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{
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Stream<bool>(_hasChrRam);
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if(_hasChrRam) {
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StreamArray<uint8_t>(_chrRam, _chrSize);
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}
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Stream<MirroringType>(_mirroringType);
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StreamArray<uint8_t>(_workRam, GetWorkRamSize());
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StreamArray<uint8_t>(_saveRam, _saveRamSize);
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StreamArray<uint32_t>(_prgPageNumbers, 64);
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StreamArray<uint32_t>(_chrPageNumbers, 64);
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if(!saving) {
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for(uint16_t i = 0; i < 64; i++) {
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if(_prgPageNumbers[i] != 0xEEEEEEEE) {
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SelectPRGPage(i, (uint16_t)_prgPageNumbers[i]);
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}
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}
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for(uint16_t i = 0; i < 64; i++) {
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if(_chrPageNumbers[i] != 0xEEEEEEEE) {
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SelectCHRPage(i, (uint16_t)_chrPageNumbers[i]);
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}
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}
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if(_mirroringType != MirroringType::Custom) {
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SetMirroringType(_mirroringType);
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}
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}
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}
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public:
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void Initialize(ROMLoader &romLoader)
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{
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_cartNametableRam[0] = nullptr;
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_cartNametableRam[1] = nullptr;
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_romFilename = romLoader.GetFilename();
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_batteryFilename = GetBatteryFilename();
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_saveRamSize = GetSaveRamSize(); //Needed because we need to call SaveBattery() in the destructor (and calling virtual functions in the destructor doesn't work correctly)
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_allowRegisterRead = AllowRegisterRead();
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_registerStartAddress = RegisterStartAddress();
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_registerEndAddress = RegisterEndAddress();
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_mirroringType = romLoader.GetMirroringType();
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romLoader.GetPRGRam(&_prgRom);
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romLoader.GetPRGRam(&_originalPrgRom);
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romLoader.GetCHRRam(&_chrRam);
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_prgSize = romLoader.GetPrgSize();
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_chrSize = romLoader.GetChrSize();
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_hasBattery = romLoader.HasBattery() || ForceBattery();
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_isPalRom = romLoader.IsPalRom();
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_saveRam = new uint8_t[_saveRamSize];
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_workRam = new uint8_t[GetWorkRamSize()];
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memset(_saveRam, 0, _saveRamSize);
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memset(_workRam, 0, GetWorkRamSize());
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memset(_prgPageNumbers, 0xEE, sizeof(_prgPageNumbers));
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memset(_chrPageNumbers, 0xEE, sizeof(_chrPageNumbers));
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for(int i = 0; i <= 0xFF; i++) {
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//Allow us to map a different page every 256 bytes
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_prgPages.push_back(nullptr);
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_prgPageAccessType.push_back(MemoryAccessType::NoAccess);
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_chrPages.push_back(nullptr);
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_chrPageAccessType.push_back(MemoryAccessType::NoAccess);
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}
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//Load battery data if present
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if(HasBattery()) {
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LoadBattery();
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}
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if(_chrSize == 0) {
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_hasChrRam = true;
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_chrRam = new uint8_t[GetChrRamSize()];
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memset(_chrRam, 0, GetChrRamSize());
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_chrSize = GetChrRamSize();
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}
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//Setup a default work/save ram in 0x6000-0x7FFF space
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SetCpuMemoryMapping(0x6000, 0x7FFF, 0, HasBattery() ? PrgMemoryType::SaveRam : PrgMemoryType::WorkRam);
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InitMapper();
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MessageManager::RegisterNotificationListener(this);
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ApplyCheats();
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}
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virtual ~BaseMapper()
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{
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if(HasBattery()) {
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SaveBattery();
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}
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delete[] _chrRam;
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delete[] _prgRom;
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delete[] _originalPrgRom;
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delete[] _saveRam;
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delete[] _workRam;
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if(_cartNametableRam[0]) {
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delete[] _cartNametableRam[0];
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}
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if(_cartNametableRam[1]) {
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delete[] _cartNametableRam[1];
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}
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MessageManager::UnregisterNotificationListener(this);
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}
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virtual void ProcessCpuClock() { }
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void ProcessNotification(ConsoleNotificationType type, void* parameter)
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{
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switch(type) {
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case ConsoleNotificationType::CheatAdded:
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case ConsoleNotificationType::CheatRemoved:
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ApplyCheats();
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break;
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default:
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break;
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}
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}
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void ApplyCheats()
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{
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RestoreOriginalPrgRam();
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CheatManager::ApplyPrgCodes(_prgRom, GetPrgSize());
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}
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void GetMemoryRanges(MemoryRanges &ranges)
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{
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ranges.AddHandler(MemoryOperation::Read, 0x4018, 0xFFFF);
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ranges.AddHandler(MemoryOperation::Write, 0x4018, 0xFFFF);
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}
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void SetDefaultNametables(uint8_t* nametableA, uint8_t* nametableB)
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{
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_nesNametableRam[0] = nametableA;
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_nesNametableRam[1] = nametableB;
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SetMirroringType(_mirroringType);
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}
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void SetMirroringType(MirroringType type)
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{
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switch(type) {
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case MirroringType::Vertical:
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SetMirroringType(_nesNametableRam[0], _nesNametableRam[1], _nesNametableRam[0], _nesNametableRam[1]);
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break;
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case MirroringType::Horizontal:
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SetMirroringType(_nesNametableRam[0], _nesNametableRam[0], _nesNametableRam[1], _nesNametableRam[1]);
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break;
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case MirroringType::FourScreens:
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default:
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if(_cartNametableRam[0] == nullptr) {
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_cartNametableRam[0] = new uint8_t[0x400];
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}
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if(_cartNametableRam[1] == nullptr) {
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_cartNametableRam[1] = new uint8_t[0x400];
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}
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SetMirroringType(_nesNametableRam[0], _nesNametableRam[1], _cartNametableRam[0], _cartNametableRam[1]);
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break;
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case MirroringType::ScreenAOnly:
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SetMirroringType(_nesNametableRam[0], _nesNametableRam[0], _nesNametableRam[0], _nesNametableRam[0]);
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break;
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case MirroringType::ScreenBOnly:
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SetMirroringType(_nesNametableRam[1], _nesNametableRam[1], _nesNametableRam[1], _nesNametableRam[1]);
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break;
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}
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_mirroringType = type;
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}
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void SetMirroringType(uint8_t *nt0, uint8_t *nt1, uint8_t *nt2, uint8_t *nt3)
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{
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_mirroringType = MirroringType::Custom;
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SetPpuMemoryMapping(0x2000, 0x23FF, nt0);
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SetPpuMemoryMapping(0x2400, 0x27FF, nt1);
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SetPpuMemoryMapping(0x2800, 0x2BFF, nt2);
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SetPpuMemoryMapping(0x2C00, 0x2FFF, nt3);
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}
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bool IsPalRom()
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{
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return _isPalRom;
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}
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MirroringType GetMirroringType()
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{
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return _mirroringType;
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}
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uint8_t ReadRAM(uint16_t addr)
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{
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if(_allowRegisterRead && addr >= _registerStartAddress && addr <= _registerEndAddress) {
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return ReadRegister(addr);
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} else if(_prgPageAccessType[addr >> 8] & MemoryAccessType::Read) {
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return _prgPages[addr >> 8][addr & 0xFF];
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} else {
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//assert(false);
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}
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return (addr & 0xFF00) >> 8;
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}
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virtual void WriteRAM(uint16_t addr, uint8_t value)
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{
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if(addr >= _registerStartAddress && addr <= _registerEndAddress) {
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WriteRegister(addr, value);
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} else {
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WritePrgRam(addr, value);
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}
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}
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void WritePrgRam(uint16_t addr, uint8_t value)
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{
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if(_prgPageAccessType[addr >> 8] & MemoryAccessType::Write) {
|
|
_prgPages[addr >> 8][addr & 0xFF] = value;
|
|
}
|
|
}
|
|
|
|
virtual uint8_t ReadVRAM(uint16_t addr)
|
|
{
|
|
if(_chrPageAccessType[addr >> 8] & MemoryAccessType::Read) {
|
|
return _chrPages[addr >> 8][addr & 0xFF];
|
|
} else {
|
|
//assert(false);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void WriteVRAM(uint16_t addr, uint8_t value)
|
|
{
|
|
if(_chrPageAccessType[addr >> 8] & MemoryAccessType::Write) {
|
|
_chrPages[addr >> 8][addr & 0xFF] = value;
|
|
} else {
|
|
//assert(false);
|
|
}
|
|
}
|
|
|
|
virtual void NotifyVRAMAddressChange(uint16_t addr)
|
|
{
|
|
//This is called when the VRAM addr on the PPU memory bus changes
|
|
//Used by MMC3/MMC5/etc
|
|
}
|
|
|
|
//Debugger Helper Functions
|
|
void GetPrgCopy(uint8_t **buffer)
|
|
{
|
|
*buffer = new uint8_t[_prgSize];
|
|
memcpy(*buffer, _prgRom, _prgSize);
|
|
}
|
|
|
|
uint32_t GetPrgSize()
|
|
{
|
|
return _prgSize;
|
|
}
|
|
|
|
void GetChrCopy(uint8_t **buffer)
|
|
{
|
|
*buffer = new uint8_t[_chrSize];
|
|
memcpy(*buffer, _chrRam, _chrSize);
|
|
}
|
|
|
|
uint32_t GetChrSize(bool includeChrRam = true)
|
|
{
|
|
if(includeChrRam || !_hasChrRam) {
|
|
return _chrSize;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int32_t ToAbsoluteAddress(uint16_t addr)
|
|
{
|
|
uint8_t *prgAddr = _prgPages[addr >> 8] + (addr & 0xFF);
|
|
if(prgAddr >= _prgRom && prgAddr < _prgRom + _prgSize) {
|
|
return (uint32_t)(prgAddr - _prgRom);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
int32_t ToAbsoluteChrAddress(uint16_t addr)
|
|
{
|
|
uint8_t *chrAddr = _chrPages[addr >> 8] + (addr & 0xFF);
|
|
if(chrAddr >= _chrRam && chrAddr < _chrRam + _chrSize) {
|
|
return (uint32_t)(chrAddr - _chrRam);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
int32_t FromAbsoluteAddress(uint32_t addr)
|
|
{
|
|
uint8_t* ptrAddress = _prgRom + addr;
|
|
|
|
for(int i = 0; i < 256; i++) {
|
|
uint8_t* pageAddress = _prgPages[i];
|
|
if(pageAddress != nullptr && ptrAddress >= pageAddress && ptrAddress <= pageAddress + 0xFF) {
|
|
return (i << 8) + (uint32_t)(ptrAddress - pageAddress);
|
|
}
|
|
}
|
|
|
|
//Address is currently not mapped
|
|
return -1;
|
|
}
|
|
|
|
vector<int32_t> GetPRGRanges()
|
|
{
|
|
vector<int32_t> memoryRanges;
|
|
|
|
for(uint32_t i = 0x8000; i <= 0xFFFF; i+=0x100) {
|
|
int32_t pageStart = ToAbsoluteAddress((uint16_t)i);
|
|
int32_t pageEnd = ToAbsoluteAddress((uint16_t)i+0xFF);
|
|
memoryRanges.push_back(pageStart);
|
|
memoryRanges.push_back(pageEnd);
|
|
}
|
|
|
|
return memoryRanges;
|
|
}
|
|
}; |