public GameboyComponent(IApp app)
{
this.gamepad_ = app.Input.Controller;
this.lcd_ = new Lcd();
this.mmu_ =
new Mmu(new MemoryMap(new IoAddresses(new SerialBus())),
new Registers());
var opcodes = new Opcodes(this.mmu_);
this.cpu_ = new Cpu(this.lcd_, this.mmu_, opcodes);
this.cpu_.OnEnterVblank += () => {
if (!this.pboCacheDirty_)
{
return;
}
this.pbo_.SetAllPixels(this.lcd_.PixelData);
this.pboCacheDirty_ = false;
};
this.apu_ = new Apu();
app.Audio.Factory.NewAudioStreamSource(this.apu_.BufferSubject,
2,
1,
Apu.FREQUENCY,
10,
Apu.FREQUENCY);
var outputPath =
"R:/Documents/CSharpWorkspace/FinCSharp/FinCSharpTests/tst/emulation/gb/blargg/output.txt";
this.writer_ = new StreamWriter(outputPath);
this.pbo_ = app.Graphics.Textures.Create(201, 144);
}
private void UpdateSquareWave_(Channel channel, int total_frames)
{
if (channel.status)
{
var square = channel.square_wave;
while (total_frames > 0)
{
int frames = (int)(square.ticks / APU_TICKS);
byte sample = Apu.CHANNELX_SAMPLE(channel, square.sample);
if (frames <= total_frames)
{
square.ticks = square.period;
square.position = (byte)((square.position + 1) % DUTY_CYCLE_COUNT);
square.sample = Apu.GetDuty(square.duty, square.position);
}
else
{
frames = total_frames;
square.ticks -= (uint)frames * APU_TICKS;
}
channel.accumulator += sample * (uint)frames;
total_frames -= frames;
}
}
}
private void Update_(int cyclesThisIteration)
{
while (cyclesThisIteration > 0)
{
var next_seq_ticks =
Apu.NextModulo_(this.syncTicks_, FRAME_SEQUENCER_TICKS);
if (next_seq_ticks == FRAME_SEQUENCER_TICKS)
{
this.frame_ = (byte)((this.frame_ + 1) % FRAME_SEQUENCER_COUNT);
var updateSweep = this.frame_ == 2 || this.frame_ == 6;
var updateLengths =
updateSweep || this.frame_ == 0 || this.frame_ == 4;
var updateEnvelopes = updateLengths || this.frame_ == 7;
if (updateSweep)
{
this.UpdateSweep_();
}
if (updateLengths)
{
this.UpdateLengths_();
}
if (updateEnvelopes)
{
this.UpdateEnvelopes_();
}
}
var ticks = Math.Min(next_seq_ticks, cyclesThisIteration);
this.UpdateChannels_(ticks / APU_TICKS);
cyclesThisIteration -= ticks;
}
}
public void UpdateNoise_(int total_frames)
{
var channel4 = this.Channel4;
if (channel4.status)
{
var noise = this.noise;
while (total_frames > 0)
{
int frames = (int)(noise.ticks / APU_TICKS);
byte sample = Apu.CHANNELX_SAMPLE(channel4, noise.sample);
if (noise.clock_shift <= NOISE_MAX_CLOCK_SHIFT)
{
if (frames <= total_frames)
{
ushort bit = (ushort)((noise.lfsr ^ (noise.lfsr >> 1)) & 1);
if (noise.lfsr_width == LfsrWidth.LFSR_WIDTH_7)
{
noise.lfsr =
(ushort)(((noise.lfsr >> 1) & ~0x40) | (bit << 6));
}
else
{
noise.lfsr =
(ushort)(((noise.lfsr >> 1) & ~0x4000) | (bit << 14));
}
noise.sample = (byte)(~noise.lfsr & 1);
noise.ticks = noise.period;
}
else
{
frames = total_frames;
noise.ticks -= (uint)frames * APU_TICKS;
}
}
else
{
frames = total_frames;
}
channel4.accumulator += sample * (uint)frames;
total_frames = (int)(total_frames - frames);
}
}
}
