public void SoftReset()
{
Control = new ControlRegisterValues(0);
Mask = new MaskRegisterValues(0);
Status = new StatusRegisterValues(0);
isFrameOdd = false;
Memory.SoftReset();
}
public void HardReset()
{
Control = new ControlRegisterValues(0);
Mask = new MaskRegisterValues(0);
Status = new StatusRegisterValues(0);
FastBits.Clear(ImageBuffer);
isFrameOdd = false;
CurrentScanline = 0;
CurrentDot = 0;
Memory.HardReset();
}
public void Write(ushort address, byte value)
{
if (address >= 8)
{
throw new Exception("Tried writing out of range from PPU");
}
ExtMemResult = value;
if (address == 0)
{
// PPUCTRL ($2000)
Control = (ControlRegisterValues)value;
temporaryAddress.NametableSelect = Control.Nametable;
}
else if (address == 1)
{
// PPUMASK ($2001)
Mask = (MaskRegisterValues)value;
}
else if (address == 3)
{
// OAMADDR ($2003)
ExtMemOAMAddress = value;
}
else if (address == 4)
{
// OAMDATA ($2004)
Memory.OAMram[ExtMemOAMAddress++] = value;
}
else if (address == 5)
{
// PPUSCROLL ($2005)
if (!ExtMemLatch)
{
fineXScroll = (byte)(value & 7);
temporaryAddress.CoarseXScroll = (byte)(value >> 3);
}
else
{
temporaryAddress.FineYScroll = (byte)(value & 7);
temporaryAddress.CoarseYScroll = (byte)(value >> 3);
}
}
else if (address == 6)
{
// PPUADDR ($2006)
if (!ExtMemLatch)
{
temporaryAddress.High = (byte)(value & 0x3F);
}
else
{
temporaryAddress.Low = value;
currentAddress.Full = temporaryAddress.Full;
}
ExtMemLatch = !ExtMemLatch;
}
else if (address == 7)
{
// PPUDATA ($2007)
Bus.Write(currentAddress.Address, value);
currentAddress.Address += (ushort)(Control.AddressIncrement ? 32 : 1);
}
}