public void DeserializeComponentState(BinaryReader reader)
{
_addressHighByte = reader.ReadInt32();
_addressLowByte = reader.ReadInt32();
_addressWriteMode = (PortAddressWriteMode)reader.ReadInt32();
_currentPaletteAddress = reader.ReadInt32();
_currentScanline = reader.ReadInt32();
_currentVRamAddress = reader.ReadInt32();
_statusByte = reader.ReadByte();
_writeMode = (VramWriteMode)reader.ReadInt32();
_palette = reader.ReadBytes(_palette.Length);
for (Int32 i = 0; i < _transformedPalette.Length; i++)
{
_transformedPalette[i] = reader.ReadUInt16();
}
_vram = reader.ReadBytes(_vram.Length);
}
public Byte ReadVRamPort()
{
_addressWriteMode = PortAddressWriteMode.LowByte;
if (_writeMode == VramWriteMode.Vram)
return _vram[_currentVRamAddress++];
else if (_writeMode == VramWriteMode.Palette)
return _palette[_currentPaletteAddress++];
throw new ApplicationException();
}
public void WriteVRamPort(Byte value)
{
_addressWriteMode = PortAddressWriteMode.LowByte;
if (_writeMode == VramWriteMode.Vram)
{
_vram[_currentVRamAddress++] = value;
if (_currentVRamAddress > 0x3FFF)
_currentVRamAddress = 0x3FFF;
}
else if (_writeMode == VramWriteMode.Palette)
{
WritePaletteEntry(value);
}
}
public void WriteAddressPort(Byte value)
{
if (_addressWriteMode == PortAddressWriteMode.LowByte)
{
_addressLowByte = value;
_addressWriteMode = PortAddressWriteMode.HighByte;
return;
}
_addressHighByte = value;
_addressWriteMode = PortAddressWriteMode.LowByte;
var writeType = _addressHighByte >> 6;
switch (writeType)
{
case 0:
case 1:
_currentPaletteAddress = 0;
_writeMode = VramWriteMode.Vram;
_currentVRamAddress = ((_addressHighByte & 0x3F) << 8) | _addressLowByte;
break;
case 2:
WriteToRegister(_addressHighByte & 0x0F, _addressLowByte);
break;
case 3:
// Write to palette.
_currentVRamAddress = 0;
_writeMode = VramWriteMode.Palette;
_currentPaletteAddress = _addressLowByte & 0x1F;
break;
default:
throw new ApplicationException();
}
}