public Mapper2(Cartridge cart)
{
this.cart = cart;
prgBanks = cart.prg.Length / 0x4000;
prgBank1 = 0;
prgBank2 = prgBanks - 1;
}
public static IMapper Create(Cartridge cart)
{
if (cart.mapper == 0 || cart.mapper == 2)
{
return(new Mapper2(cart));
}
return(null);
}
private void LoadMapper(Cartridge cartridge)
{
Mapper = cartridge.Mapper switch
{
000 => new Nrom(cartridge),
// 001 or 105 or 155 => new Mmc1(cartridge),
002 or 094 or 180 => new UxRom(cartridge),
_ => null,
};
}
public PPU(Cpu cpu, Cartridge cartridge, IDisplay display, Nes nes)
{
_nes = nes;
_display = display;
_cpu = cpu;
_cartridge = cartridge;
for (int i = 0; i < 64; i++)
{
Oam[i] = new Oam();
}
}
public void Load(Cartridge cart)
{
ram = new byte[2048];
this.cart = cart;
mapper = Mapper.Create(cart);
cpu = new CPU(this);
ppu = new PPU(this);
if (mapper == null)
{
throw new Exception("Unknown mapper type: " + cart.mapper.ToString());
}
Reset();
}
public Emulator(Cartridge cartridge)
{
LoadMapper(cartridge);
if (Mapper == null)
{
return;
}
Cpu = new Cpu(this);
Ppu = new Ppu(this);
Apu = new Apu(this);
ControllerOne = new Controller();
ControllerTwo = new Controller();
IsValid = true;
}
public void StartEmulator(string path)
{
var cartridge = new Cartridge(path);
if (!cartridge.IsValid)
{
return;
}
Emulator = new Emulator(cartridge);
if (!Emulator.IsValid)
{
return;
}
screen.StartOutput(this);
controller.StartController(Emulator);
#if UNITY_EDITOR
UpdateStepMode();
if (cpuDebug != null)
{
cpuDebug.StartCpuDebug(Emulator);
}
if (ppuDebug != null)
{
ppuDebug.StartPpuDebug(this);
}
if (framerate != null)
{
framerate.StartFramerate(Emulator.Ppu);
}
if (log != null)
{
log.StartLog(Emulator);
}
#endif
Emulator.Init();
}
private void loadiNes(string filename)
{
FileStream fs = File.OpenRead(filename);
StreamReader r = new StreamReader(fs);
// Check header
byte[] buffer = new byte[4];
fs.Read(buffer, 0, 4);
if ((buffer[0] != 0x4E) || (buffer[1] != 0x45) || (buffer[2] != 0x53) || (buffer[3] != 0x1A))
{
throw new FileLoadException("Unsupported file format!");
}
// Datas!
byte numPRG = (byte)fs.ReadByte();
byte numCHR = (byte)fs.ReadByte();
byte control1 = (byte)fs.ReadByte();
byte control2 = (byte)fs.ReadByte();
byte numRAM = (byte)fs.ReadByte();
buffer = new byte[7];
fs.Read(buffer, 0, 7); // blank.
// Sanity check, 16byte header?
if (fs.Position != 16)
{
throw new FileLoadException("We did it wrong!");
}
// Process!
numRAM = (numRAM == 0) ? (byte)1 : numRAM;
Cartridge = new Cartridge(this, numPRG, numCHR, numRAM);
// Control 1
PPU.Mirroring = ((control1 & 1) > 0) ? Mirroring.Vertical : Mirroring.Horizontal; // Bit 0 - Type of mirroring
Cartridge.SRAM = ((control1 & 2) > 0) ? true : false; // Bit 1 - Presence of SRAM
Cartridge.HasTrainer = ((control1 & 4) > 0) ? true : false; // Bit 2 - Presence of Trainer
if ((control1 & 8) > 0) // Bit 3 - If set, overrides bit 0 to indicate 4-screen mirroring
{
PPU.Mirroring = Mirroring.None;
}
Cartridge.MapperNumer = (control1 & 0xF0) >> 4; // Bit 4-7 - 4 lower bits of mapper number
// Control 2
Cartridge.MapperNumer |= (control2 & 0xF0); // Bit 4-7 - 4 upper bits of mapper number
// Trainer
if (Cartridge.HasTrainer)
{
fs.Read(Cartridge.Trainer, 0, Cartridge.TrainerLength);
}
// Load PRG-ROM
for (int i = 0; i < numPRG; i++)
{
Cartridge.PRGROMBanks[i] = new byte[Cartridge.PRGLength];
fs.Read(Cartridge.PRGROMBanks[i], 0, Cartridge.PRGLength);
}
// Load CHR-ROM
for (int i = 0; i < numCHR; i++)
{
Cartridge.CHRBanks[i] = new byte[Cartridge.CHRLength];
fs.Read(Cartridge.CHRBanks[i], 0, Cartridge.CHRLength);
}
}
private void loadiNes(string filename)
{
FileStream fs = File.OpenRead(filename);
StreamReader r = new StreamReader(fs);
// Check header
byte[] buffer = new byte[4];
fs.Read(buffer, 0, 4);
if ((buffer[0] != 0x4E) || (buffer[1] != 0x45) || (buffer[2] != 0x53) || (buffer[3] != 0x1A))
throw new FileLoadException("Unsupported file format!");
// Datas!
byte numPRG = (byte)fs.ReadByte();
byte numCHR = (byte)fs.ReadByte();
byte control1 = (byte)fs.ReadByte();
byte control2 = (byte)fs.ReadByte();
byte numRAM = (byte)fs.ReadByte();
buffer = new byte[7];
fs.Read(buffer, 0, 7); // blank.
// Sanity check, 16byte header?
if (fs.Position != 16)
throw new FileLoadException("We did it wrong!");
// Process!
numRAM = (numRAM == 0) ? (byte)1 : numRAM;
Cartridge = new Cartridge(this, numPRG, numCHR, numRAM);
// Control 1
PPU.Mirroring = ((control1 & 1) > 0) ? Mirroring.Vertical : Mirroring.Horizontal; // Bit 0 - Type of mirroring
Cartridge.SRAM = ((control1 & 2) > 0) ? true : false; // Bit 1 - Presence of SRAM
Cartridge.HasTrainer = ((control1 & 4) > 0) ? true : false; // Bit 2 - Presence of Trainer
if ((control1 & 8) > 0) // Bit 3 - If set, overrides bit 0 to indicate 4-screen mirroring
PPU.Mirroring = Mirroring.None;
Cartridge.MapperNumer = (control1 & 0xF0) >> 4; // Bit 4-7 - 4 lower bits of mapper number
// Control 2
Cartridge.MapperNumer |= (control2 & 0xF0); // Bit 4-7 - 4 upper bits of mapper number
// Trainer
if (Cartridge.HasTrainer)
fs.Read(Cartridge.Trainer, 0, Cartridge.TrainerLength);
// Load PRG-ROM
for (int i = 0; i < numPRG; i++)
{
Cartridge.PRGROMBanks[i] = new byte[Cartridge.PRGLength];
fs.Read(Cartridge.PRGROMBanks[i], 0, Cartridge.PRGLength);
}
// Load CHR-ROM
for (int i = 0; i < numCHR; i++)
{
Cartridge.CHRBanks[i] = new byte[Cartridge.CHRLength];
fs.Read(Cartridge.CHRBanks[i], 0, Cartridge.CHRLength);
}
}
