static void Main(string[] args)
{
if (SDL.SDL_Init(SDL.SDL_INIT_EVERYTHING) < 0)
{
Console.WriteLine("SDL failed to init.");
return;
}
IntPtr window = SDL.SDL_CreateWindow("Chip-8 Interpreter", 128, 128, 64 * 8, 32 * 8, 0);
if (window == IntPtr.Zero)
{
Console.WriteLine("SDL could not create a window.");
return;
}
IntPtr renderer = SDL.SDL_CreateRenderer(window, -1, SDL.SDL_RendererFlags.SDL_RENDERER_ACCELERATED);
if (renderer == IntPtr.Zero)
{
Console.WriteLine("SDL could not create a valid renderer.");
return;
}
CPU cpu = new CPU();
using (BinaryReader reader = new BinaryReader(new FileStream("../../sample.ch8", FileMode.Open)))
{
List <byte> program = new List <byte>();
while (reader.BaseStream.Position < reader.BaseStream.Length)
{
program.Add(reader.ReadByte());
}
cpu.LoadProgram(program.ToArray());
}
SDL.SDL_Event sdlEvent;
bool running = true;
int sample = 0;
int beepSamples = 0;
SDL.SDL_AudioSpec audioSpec = new SDL.SDL_AudioSpec();
audioSpec.channels = 1;
audioSpec.freq = 44100;
audioSpec.samples = 256;
audioSpec.format = SDL.AUDIO_S8;
audioSpec.callback = new SDL.SDL_AudioCallback((userdata, stream, length) =>
{
if (cpu == null)
{
return;
}
sbyte[] waveData = new sbyte[length];
for (int i = 0; i < waveData.Length && cpu.SoundTimer > 0; i++, beepSamples++)
{
if (beepSamples == 730)
{
beepSamples = 0;
cpu.SoundTimer--;
}
waveData[i] = (sbyte)(127 * Math.Sin(sample * Math.PI * 2 * 604.1 / 44100));
sample++;
}
byte[] byteData = (byte[])(Array)waveData;
Marshal.Copy(byteData, 0, stream, byteData.Length);
});
SDL.SDL_OpenAudio(ref audioSpec, IntPtr.Zero);
SDL.SDL_PauseAudio(0);
IntPtr sdlSurface, sdlTexture = IntPtr.Zero;
Stopwatch frameTimer = Stopwatch.StartNew();
int ticksPer60hz = (int)(Stopwatch.Frequency * 0.016);
while (running)
{
try
{
if (!cpu.WaitingForKeyPress)
{
cpu.Step();
}
if (frameTimer.ElapsedTicks > ticksPer60hz)
{
while (SDL.SDL_PollEvent(out sdlEvent) != 0)
{
if (sdlEvent.type == SDL.SDL_EventType.SDL_QUIT)
{
running = false;
}
else if (sdlEvent.type == SDL.SDL_EventType.SDL_KEYDOWN)
{
var key = KeyCodeToKey((int)sdlEvent.key.keysym.sym);
cpu.Keyboard |= (ushort)(1 << key);
if (cpu.WaitingForKeyPress)
{
cpu.KeyPressed((byte)key);
}
}
else if (sdlEvent.type == SDL.SDL_EventType.SDL_KEYUP)
{
var key = KeyCodeToKey((int)sdlEvent.key.keysym.sym);
cpu.Keyboard &= (ushort)~(1 << key);
}
}
var displayHandle = GCHandle.Alloc(cpu.Display, GCHandleType.Pinned);
if (sdlTexture != IntPtr.Zero)
{
SDL.SDL_DestroyTexture(sdlTexture);
}
sdlSurface = SDL.SDL_CreateRGBSurfaceFrom(displayHandle.AddrOfPinnedObject(), 64, 32, 32, 64 * 4, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
sdlTexture = SDL.SDL_CreateTextureFromSurface(renderer, sdlSurface);
displayHandle.Free();
SDL.SDL_RenderClear(renderer);
SDL.SDL_RenderCopy(renderer, sdlTexture, IntPtr.Zero, IntPtr.Zero);
SDL.SDL_RenderPresent(renderer);
frameTimer.Restart();
}
Thread.Sleep(1);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
SDL.SDL_DestroyRenderer(renderer);
SDL.SDL_DestroyWindow(window);
}