public MBC3(CartHeader header, byte[] gameROM, MemoryMappedFile file, Func <long>?getClock = null)
{
this.gameROM = gameROM;
RAMBanks = file.CreateViewAccessor(0, header.RAM_Size);
//0x800 is the only alternative bank size
if (header.RAM_Size == 0)
{
RAMBankSize = 0;
}
//0x800 is the only alternative bank size
if (header.RAM_Size == 0x800)
{
RAMBankSize = 0x800;
}
if (getClock is not null)
{
ClockStorage = file.CreateViewAccessor(header.RAM_Size, 16);
hasClock = true;
var InitialOffsetFromSave = ClockStorage.ReadInt64(0);
var timeOfLastSave = ClockStorage.ReadInt64(8);
var DotNetTicksElapsed = DateTime.Now.Ticks - timeOfLastSave;
var GameboyTicksElapsed = (long)(DotNetTicksElapsed * (TicksPerSecond / 10000000.0));
InitialOffsetFromSave += GameboyTicksElapsed;
GetRTC = () => getClock() + InitialOffsetFromSave;
}
}
public MBC1(CartHeader header, byte[] gameROM)
{
this.gameROM = gameROM;
ROMBankCount = this.gameROM.Length / 0x4000;
RAMBankCount = Math.Max(1, header.RAM_Size / RAMBankSize);
RAMBankSize = Math.Min(header.RAM_Size, 0x2000);
RAMBanks = new byte[Math.Max(0x2000, header.RAM_Size)];
}
public MBC1WithBatteryBackedRAM(CartHeader header, byte[] gameROM, MemoryMappedFile file)
{
this.gameROM = gameROM;
ROMBankCount = this.gameROM.Length / 0x4000;
RAMBankCount = Math.Max(1, header.RAM_Size / RAMBankSize);
RAMBankSize = Math.Min(header.RAM_Size, 0x2000);
RAMBanks = file.CreateViewAccessor(0, header.RAM_Size);
}
public MBC5(CartHeader header, byte[] gameROM)
{
this.gameROM = gameROM;
ROMBankCount = this.gameROM.Length / 0x4000;
RAMBankCount = Math.Max(1, header.RAM_Size / RAMBankSize);
RAMBanks = null;
//0x800 is the only alternative bank size
if (header.RAM_Size == 0)
{
RAMBankSize = 0;
}
//0x800 is the only alternative bank size
if (header.RAM_Size == 0x800)
{
RAMBankSize = 0x800;
}
}
public MBC5(CartHeader header, byte[] gameROM, System.IO.MemoryMappedFiles.MemoryMappedFile file)
{
this.gameROM = gameROM;
ROMBankCount = this.gameROM.Length / 0x4000;
RAMBankCount = Math.Max(1, header.RAM_Size / RAMBankSize);
RAMBanks = file.CreateViewAccessor(0, header.RAM_Size);
//0x800 is the only alternative bank size
if (header.RAM_Size == 0)
{
RAMBankSize = 0;
}
//0x800 is the only alternative bank size
if (header.RAM_Size == 0x800)
{
RAMBankSize = 0x800;
}
}
public MBC5WithRumble(CartHeader cartHeader, byte[] gameROM, MemoryMappedFile memoryMappedFile) : base(cartHeader, gameROM, memoryMappedFile)
{
}
public Core(byte[] gameROM, byte[]?bootROM, Keypad Keypad, FrameSink frameSink)
{
if (gameROM.Length < 0x8000)
{
throw new Exception("Cartridge file has to be at least 8kb in size");
}
PC = new();
InterruptRegisters = new InterruptRegisters();
Keypad.Input.KeyWentDown += InterruptRegisters.TriggerEvent;
APU = new APU(32768);
PPU = new PPU(InterruptRegisters.EnableVBlankInterrupt, InterruptRegisters.EnableLCDSTATInterrupt, frameSink);
Timers = new Timers(InterruptRegisters.EnableTimerInterrupt);
var ioRegisters = SetupControlRegisters(Keypad);
CartHeader Header = new CartHeader(gameROM);
MBC Card;
if (Header.HasBattery())
{
var mmf = Header.MakeMemoryMappedFile();
Card = Header.HasClock() ? Header.MakeMBC(gameROM, mmf, () => masterclock) : Header.MakeMBC(gameROM, mmf);
}
else
{
Card = Header.MakeMBC(gameROM);
}
//Writing out the RTC too often would be very heavy. This writes it out once per frame.
//
if (Header.Type == CartType.MBC3_TIMER_RAM_BATTERY)
{
var SaveRTC = ((MBC3)Card).SaveRTC();
void h(object?x, EventArgs y) => SaveRTC();
frameSink.FramePushed += h;
}
if (Card is MBC5WithRumble rumble)
{
rumble.RumbleStateChange += Keypad.ToggleRumble;
}
Memory = new MMU(
bootROM,
Card,
PPU.VRAM,
PPU.OAM,
ioRegisters,
(x => InterruptRegisters.InterruptControlRegister = x,
() => InterruptRegisters.InterruptControlRegister),
PC
);
CPU = new CPU(Memory, InterruptRegisters, PC);
ioRegisters[0x0f] = InterruptRegisters.HookUp();
ioRegisters[0x50] = Memory.HookUpMemory();
//We have to replicate the state of the system post boot without running the bootrom
if (bootROM == null)
{
//registers
CPU.SetStateWithoutBootrom();
//timers
Timers.SetStateWithoutBootrom();
//sound
APU.SetStateWithoutBootrom();
//graphics TODO: we can't really set up the graphics environment correctly
//because we will have to also initialize the internal renderer state correctly
PPU.SetStateWithoutBootrom();
InterruptRegisters.SetStateWithoutBootrom();
}
}
