private static int MirrorNametable(UInt16 address, Cartridge.MirrorMode mirrorMode)
{
int nameTableId = Nametable.NametableId(address);
switch (mirrorMode)
{
case Cartridge.MirrorMode.VERTICAL:
if (nameTableId == 0 || nameTableId == 2)
{
return(0);
}
else
{
return(1);
}
case Cartridge.MirrorMode.HORIZONTAL:
if (nameTableId == 0 || nameTableId == 1)
{
return(0);
}
else
{
return(1);
}
}
return(0);
}
public void Write(UInt16 address, Cartridge.MirrorMode mirrorMode, byte data)
{
UInt16 maskedAddress = Nametable.MaskAddress(address);
int id = Nametable.MirrorNametable(maskedAddress, mirrorMode);
int offset = Nametable.Offset(maskedAddress);
nameTable[id, offset] = data;
}
public byte Read(UInt16 address, Cartridge.MirrorMode mirrorMode)
{
UInt16 maskedAddress = Nametable.MaskAddress(address);
int id = Nametable.MirrorNametable(maskedAddress, mirrorMode);
int offset = Nametable.Offset(maskedAddress);
return(nameTable[id, offset]);
}