/**
* Used to start execution of the CPU with the given ROM and optional emulator state.
* The emulator's hardware loop will run on a spereate thread, and therefore, this method
* is non-blocking.
*/
public void Start(byte[] rom, EmulatorState state = null)
{
if (_thread != null)
{
throw new Exception("Emulator cannot be started because it was already running.");
}
_cyclesSinceLastInterrupt = 0;
_nextInterrupt = Interrupt.One;
_cpu = new CPU(_cpuConfig);
_cpu.OnDeviceRead += CPU_OnDeviceRead;
_cpu.OnDeviceWrite += CPU_OnDeviceWrite;
// Map the ROM into the lower 8K of the memory space.
var memory = new byte[_cpuConfig.MemorySize];
Array.Copy(rom, memory, rom.Length);
_cpu.LoadMemory(memory);
_shiftRegister = new ShiftRegister();
_renderEventArgs = new RenderEventArgs()
{
ShouldRender = false,
FrameBuffer = new byte[FRAME_BUFFER_SIZE],
};
_soundEventArgs = new SoundEventArgs();
if (state != null)
{
LoadState(state);
}
_cancelled = false;
_thread = new Thread(new ThreadStart(HardwareLoop));
_thread.Name = "Emulator: Hardware Loop";
_thread.Start();
}
/**
* Fired when the emulator needs to play a sound.
*/
private static void SpaceInvaders_OnSound(SoundEventArgs eventArgs)
{
_soundEffects.Add(eventArgs.SoundEffect);
_playSoundNextTick = true;
}