AxibugEmuOnline/OtherCore/MyNes.Standard2/MyNes.Core/MMC5Pcm.cs

using System.IO;

namespace MyNes.Core
{
    internal class MMC5Pcm
    {
    	internal byte output;

    	internal bool Outputable;

    	private bool readMode;

    	private bool PCMIRQenable;

    	private bool irqTrip;

    	internal void HardReset()
    	{
    		output = 0;
    		readMode = false;
    		PCMIRQenable = false;
    		irqTrip = false;
    	}

    	internal void SoftReset()
    	{
    		HardReset();
    	}

    	internal void Write5010(byte data)
    	{
    		readMode = (data & 1) == 1;
    		PCMIRQenable = (data & 0x80) == 128;
    		if (PCMIRQenable && irqTrip)
    		{
    			NesEmu.IRQFlags |= 8;
    		}
    	}

    	internal byte Read5010()
    	{
    		byte result = (byte)((irqTrip & PCMIRQenable) ? 128 : 0);
    		irqTrip = false;
    		NesEmu.IRQFlags &= -9;
    		return result;
    	}

    	internal void Write5011(byte data)
    	{
    		if (readMode)
    		{
    			return;
    		}
    		if (data == 0)
    		{
    			irqTrip = true;
    		}
    		else
    		{
    			irqTrip = false;
    			if (Outputable)
    			{
    				output = data;
    			}
    		}
    		if (PCMIRQenable && irqTrip)
    		{
    			NesEmu.IRQFlags |= 8;
    		}
    	}

    	internal void SaveState(ref BinaryWriter stream)
    	{
    		stream.Write(readMode);
    		stream.Write(PCMIRQenable);
    		stream.Write(irqTrip);
    	}

    	internal void LoadState(ref BinaryReader stream)
    	{
    		readMode = stream.ReadBoolean();
    		PCMIRQenable = stream.ReadBoolean();
    		irqTrip = stream.ReadBoolean();
    	}
    }
}