AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper040.cs

//////////////////////////////////////////////////////////////////////////
// Mapper040  SMB2J                                                     //
//////////////////////////////////////////////////////////////////////////
using System;
using static VirtualNes.Core.CPU;
using static VirtualNes.MMU;
using BYTE = System.Byte;
using INT = System.Int32;


namespace VirtualNes.Core
{
    public class Mapper040 : Mapper
    {
        BYTE irq_enable;
        INT irq_line;
        public Mapper040(NES parent) : base(parent)
        {
        }


        public override void Reset()
        {
            irq_enable = 0;
            irq_line = 0;

            SetPROM_8K_Bank(3, 6);
            SetPROM_32K_Bank(4, 5, 0, 7);

            if (VROM_1K_SIZE != 0)
            {
                SetVROM_8K_Bank(0);
            }
        }

        //void Mapper040::Write(WORD addr, BYTE data)
        public override void Write(ushort addr, byte data)
        {
            switch (addr & 0xE000)
            {
                case 0x8000:
                    irq_enable = 0;
                    nes.cpu.ClrIRQ(IRQ_MAPPER);
                    break;
                case 0xA000:
                    irq_enable = 0xFF;
                    irq_line = 37;
                    nes.cpu.ClrIRQ(IRQ_MAPPER);
                    break;
                case 0xC000:
                    break;
                case 0xE000:
                    SetPROM_8K_Bank(6, data & 0x07);
                    break;
            }
        }

        //void Mapper040::HSync(INT scanline)
        public override void HSync(int scanline)
        {
            if (irq_enable != 0)
            {
                if (--irq_line <= 0)
                {
                    //			nes.cpu.IRQ();
                    nes.cpu.SetIRQ(IRQ_MAPPER);
                }
            }
        }

        //void Mapper040::SaveState(LPBYTE p)
        public override void SaveState(byte[] p)
        {
            p[0] = irq_enable;
            //*(INT*)&p[1] = irq_line;
            BitConverter.GetBytes(irq_line).CopyTo(p, 1);
        }

        //void Mapper040::LoadState(LPBYTE p)
        public override void LoadState(byte[] p)
        {
            irq_enable = p[0];
            //irq_line = *(INT*)&p[1];
            irq_line = BitConverter.ToInt32(p,1);
        }

        public override bool IsStateSave()
        {
            return true;
        }

    }
}