private bool REG(ushort instruction)
{
byte subcommand = ParserFunctions.GetSubCommand(instruction);
var command = RegisterCommands[subcommand];
var regX = ParserFunctions.GetX(instruction);
var regY = ParserFunctions.GetY(instruction);
command(regX, regY);
return(false);
}
private bool SNEV(ushort instruction)
{
var regX = ParserFunctions.GetX(instruction);
var regY = ParserFunctions.GetY(instruction);
var regValueX = Register[regX];
var regValueY = Register[regY];
if (regValueX != regValueY)
{
InstructionPointer += 2;
}
return(true);
}
private bool SEV(ushort instruction)
{
byte x = ParserFunctions.GetX(instruction);
byte regValueX = Register[x];
byte y = ParserFunctions.GetY(instruction);
byte regValueY = Register[y];
if (regValueX == regValueY)
{
InstructionPointer += 2;
}
return(false);
}
private bool DRW(ushort instruction)
{
var Vx = ParserFunctions.GetX(instruction);
var Vy = ParserFunctions.GetY(instruction);
var x = Register[Vx];
var y = Register[Vy];
var count = ParserFunctions.GetSubCommand(instruction);
byte[] sprite = new byte[count];
for (ushort i = 0; i < count; i++)
{
sprite[i] = memory.GetValue((ushort)(AddressRegister + i));
}
var collision = SetSprite(x, y, sprite, count);
Register[0xF] = (byte)collision;
// Draw screen
display.Print();
return(false);
}