117 lines
2.1 KiB
C#
117 lines
2.1 KiB
C#
using System.IO;
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namespace MyNes.Core
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{
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internal class VRC6Pulse
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{
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private int dutyForm;
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private int dutyStep;
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private bool enabled = true;
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internal bool Outputable;
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private bool mode;
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private byte volume;
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private int freqTimer;
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private int frequency;
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private int cycles;
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internal int output;
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internal void HardReset()
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{
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dutyForm = 0;
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dutyStep = 15;
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enabled = true;
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mode = false;
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output = 0;
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}
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internal void Write0(ref byte data)
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{
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mode = (data & 0x80) == 128;
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dutyForm = (data & 0x70) >> 4;
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volume = (byte)(data & 0xFu);
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}
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internal void Write1(ref byte data)
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{
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frequency = (frequency & 0xF00) | data;
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}
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internal void Write2(ref byte data)
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{
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frequency = (frequency & 0xFF) | ((data & 0xF) << 8);
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enabled = (data & 0x80) == 128;
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}
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internal void ClockSingle()
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{
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if (--cycles > 0)
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{
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return;
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}
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cycles = (frequency << 1) + 2;
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if (!enabled)
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{
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return;
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}
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if (mode)
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{
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output = volume;
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return;
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}
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dutyStep--;
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if (dutyStep < 0)
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{
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dutyStep = 15;
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}
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if (dutyStep <= dutyForm)
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{
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if (Outputable)
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{
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output = volume;
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}
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else
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{
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output = 0;
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}
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}
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else
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{
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output = 0;
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}
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}
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internal void SaveState(ref BinaryWriter stream)
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{
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stream.Write(dutyForm);
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stream.Write(dutyStep);
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stream.Write(enabled);
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stream.Write(mode);
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stream.Write(volume);
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stream.Write(freqTimer);
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stream.Write(frequency);
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stream.Write(cycles);
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}
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internal void LoadState(ref BinaryReader stream)
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{
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dutyForm = stream.ReadInt32();
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dutyStep = stream.ReadInt32();
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enabled = stream.ReadBoolean();
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mode = stream.ReadBoolean();
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volume = stream.ReadByte();
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freqTimer = stream.ReadInt32();
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frequency = stream.ReadInt32();
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cycles = stream.ReadInt32();
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}
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}
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}
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