public MainWindow()
{
InitializeComponent();
m_romReader = new NesRomReader(@"C:\Downloads\emulation\fceux\Super Mario Bros.nes");
//m_romReader = new NesRomReader(@"D:\Profiles\p57500\Desktop\emu\Super Mario Bros.nes");
m_emulationShell = new EmulationShell(m_romReader, m_wpfNesVideoOut);
//timer.Elapsed += (object sender, ElapsedEventArgs e) =>
//{
// Random r = new Random();
// for (int x = 0; x < 256; x++)
// {
// for (int y = 0; y < 240; y++)
// {
// m_wpfNesVideoOut.PlotPixel(x, y, r.Next(0, 0x39));
// }
// }
// m_wpfNesVideoOut.Invalidate();
//};
//timer.AutoReset = true;
//timer.Enabled = true;
}
public EmulationShell(INesRomReader romReader, INesVideoOut videoOut)
{
m_cpu = new Nmos6502(m_sync);
m_ppu = new NesPpu(m_sync)
{
Cpu = m_cpu, VideoOut = videoOut
};
InitializeSpriteMemory(romReader);
InitializeCpuMemory(romReader);
InitializePpuMemory(romReader);
m_cpu.BeginRun();
m_ppu.BeginRun();
}
private void InitializeSpriteMemory(INesRomReader romReader)
{
unsafe
{
byte *[] spriteRam = new byte *[0x100];
//sprite ram 0h to FFh
for (int i = 0; i < 0x100; i++)
{
spriteRam[i] = ((byte *)m_ppuAlloc) + m_ppuAllocIndex++;
*(spriteRam[i]) = 0;
}
m_ppu.SpriteRam = new BytePointerArray(spriteRam);
}
}
private void InitializePpuMemory(INesRomReader romReader)
{
unsafe
{
byte *[] videoRam = new byte *[0x10000];
//pattern tables (0h to FFFh and 1000h to 1FFFH)
for (int i = 0; i < 0x2000; i++)
{
videoRam[i] = ((byte *)m_ppuAlloc) + m_ppuAllocIndex++;
*(videoRam[i]) = romReader.VRomBanks[i];
}
//name table 0 (2000h to 23FFh)
for (int i = 0x2000; i < 0x2400; i++)
{
videoRam[i] = ((byte *)m_ppuAlloc) + m_ppuAllocIndex++;
*(videoRam[i]) = 0;
}
//name table 3 (2C00h to 2FFFh)
for (int i = 0x2C00; i < 0x3000; i++)
{
videoRam[i] = ((byte *)m_ppuAlloc) + m_ppuAllocIndex++;
*(videoRam[i]) = 0;
}
if (romReader.MirroringMode == Mirroring.Horizontal)
{
//name table 0 and 1 mirrored
for (int i = 0x2400, j = 0x2000; i < 0x2800; i++, j++)
{
videoRam[i] = videoRam[j];
}
//name table 2 and 3 mirrored
for (int i = 0x2800, j = 0x2C00; i < 0x2C00; i++, j++)
{
videoRam[i] = videoRam[j];
}
}
else if (romReader.MirroringMode == Mirroring.Vertical)
{
//name table 0 and 2 mirrored
for (int i = 0x2800, j = 0x2000; i < 0x2C00; i++, j++)
{
videoRam[i] = videoRam[j];
}
//name table 1 and 3 mirrored
for (int i = 0x2400, j = 0x2C00; i < 0x2800; i++, j++)
{
videoRam[i] = videoRam[j];
}
}
//mirrors of 2000h to 2EFFh
for (int i = 0x3000, j = 0x2000; i < 0x3F00; i++, j++)
{
videoRam[i] = videoRam[j];
}
//palettes (image 3F00h to 3F0Fh, sprite 3F10h to 3F1Fh,
//mirrors of 3F00h every 4 bytes)
videoRam[0x3F00] = ((byte *)m_ppuAlloc) + m_ppuAllocIndex++;
*(videoRam[0x3F00]) = 0;
for (int i = 0x3F01; i < 0x3F20; i++)
{
if ((i % 4) == 0)
{
videoRam[i] = videoRam[0x3F00];
}
else
{
videoRam[i] = ((byte *)m_ppuAlloc) + m_ppuAllocIndex++;
*(videoRam[i]) = 0;
}
}
//mirrors of 3F00h to 3F1Fh
for (int i = 0x3F20; i < 0x4000; i++)
{
videoRam[i] = videoRam[0x3F00 + (i % 20)];
}
//mirrors of 0h to 3FFFh
for (int i = 0; i < 0x4000; i++)
{
videoRam[i + 0x4000] = videoRam[i];
videoRam[i + 0x4000 * 2] = videoRam[i];
videoRam[i + 0x4000 * 3] = videoRam[i];
}
m_ppu.VideoRam = new BytePointerArray(videoRam);
}
}
private void InitializeCpuMemory(INesRomReader romReader)
{
unsafe
{
byte *[] cpuMemory = new byte *[0x10000];
//zero page, stack, ram (200h to 800h)
for (int i = 0; i < 0x0800; i++)
{
cpuMemory[i] = ((byte *)m_cpuAlloc) + m_cpuAllocIndex++;
*(cpuMemory[i]) = 0xFF;
cpuMemory[i + 0x800] = cpuMemory[i];
cpuMemory[i + 0x800 * 2] = cpuMemory[i];
cpuMemory[i + 0x800 * 3] = cpuMemory[i];
}
//ppu control registers
for (int i = 0x2000; i < 0x2008; i++)
{
cpuMemory[i] = ((byte *)m_cpuAlloc) + m_cpuAllocIndex++;
*(cpuMemory[i]) = 0;
}
//mirrors of ppu control registers
for (int i = 0x2008; i < 0x4000; i++)
{
cpuMemory[i] = cpuMemory[0x2000 + (i % 8)];
}
//apu control registers (4000h to 401Fh), expansion rom (4020h to 5FFFh),
//sram 6000h to 7FFFh
for (int i = 0x4000; i < 0x8000; i++)
{
cpuMemory[i] = ((byte *)m_cpuAlloc) + m_cpuAllocIndex++;
*(cpuMemory[i]) = 0;
}
//program rom (8000h to FFFFh)
if (romReader.MapperType == 0)
{
if (romReader.RomBankCount == 1)
{
for (int i = 0x8000, j = 0; i < 0xC000; i++, j++)
{
cpuMemory[i] = ((byte *)m_cpuAlloc) + m_cpuAllocIndex++;
*(cpuMemory[i]) = romReader.RomBanks[j];
}
for (int i = 0xC000, j = 0; i < 0x10000; i++, j++)
{
cpuMemory[i] = ((byte *)m_cpuAlloc) + m_cpuAllocIndex++;
*(cpuMemory[i]) = romReader.RomBanks[j];
}
}
else if (romReader.RomBankCount == 2)
{
for (int i = 0x8000, j = 0; i < 0x10000; i++, j++)
{
cpuMemory[i] = ((byte *)m_cpuAlloc) + m_cpuAllocIndex++;
*(cpuMemory[i]) = romReader.RomBanks[j];
}
}
else
{
throw new InvalidOperationException(string.Format("Memory mapper is 0, but rom bank count is {0}",
romReader.RomBankCount));
}
}
else
{
throw new InvalidOperationException(string.Format("Memory mapper {0} not supported",
romReader.MapperType));
}
m_cpu.Memory = new NesCpuBytePointerArray(cpuMemory, (NesPpu)m_ppu);
}
}
