AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper085.cs

//////////////////////////////////////////////////////////////////////////
// Mapper085  Konami VRC7                                               //
//////////////////////////////////////////////////////////////////////////
using System;
using static VirtualNes.Core.CPU;
using static VirtualNes.MMU;
using BYTE = System.Byte;
using INT = System.Int32;


namespace VirtualNes.Core
{
    public class Mapper085 : Mapper
    {

        BYTE irq_enable;
        BYTE irq_counter;
        BYTE irq_latch;
        INT irq_clock;
        public Mapper085(NES parent) : base(parent)
        {
        }

        public override void Reset()

        {
            irq_enable = 0;
            irq_counter = 0;
            irq_latch = 0;
            irq_clock = 0;

            SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
            if (VROM_1K_SIZE != 0)
            {
                SetVROM_8K_Bank(0);
            }
            else
            {
                SetCRAM_8K_Bank(0);
            }

#if FALSE//0
//	DWORD	crc = nes.rom.GetPROM_CRC();
//	if( crc == 0x1aa0479c ) {	// For Tiny Toon Adventures 2 - Montana Land he Youkoso(J)
//		nes.SetRenderMethod( NES::PRE_RENDER );
//	}
//	if( crc == 0x33ce3ff0 ) {	// For Lagrange Point(J)
//		nes.SetRenderMethod( NES::TILE_RENDER );
//	}
#endif
            nes.apu.SelectExSound(2);
        }

        //void Mapper085::Write(WORD addr, BYTE data)
        public override void Write(ushort addr, byte data)
        {
            switch (addr & 0xF038)
            {
                case 0x8000:
                    SetPROM_8K_Bank(4, data);
                    break;
                case 0x8008:
                case 0x8010:
                    SetPROM_8K_Bank(5, data);
                    break;
                case 0x9000:
                    SetPROM_8K_Bank(6, data);
                    break;

                case 0x9010:
                case 0x9030:
                    nes.apu.ExWrite(addr, data);
                    break;

                case 0xA000:
                    if (VROM_1K_SIZE != 0)
                    {
                        SetVROM_1K_Bank(0, data);
                    }
                    else
                    {
                        SetCRAM_1K_Bank(0, data);
                    }
                    break;

                case 0xA008:
                case 0xA010:
                    if (VROM_1K_SIZE != 0)
                    {
                        SetVROM_1K_Bank(1, data);
                    }
                    else
                    {
                        SetCRAM_1K_Bank(1, data);
                    }
                    break;

                case 0xB000:
                    if (VROM_1K_SIZE != 0)
                    {
                        SetVROM_1K_Bank(2, data);
                    }
                    else
                    {
                        SetCRAM_1K_Bank(2, data);
                    }
                    break;

                case 0xB008:
                case 0xB010:
                    if (VROM_1K_SIZE != 0)
                    {
                        SetVROM_1K_Bank(3, data);
                    }
                    else
                    {
                        SetCRAM_1K_Bank(3, data);
                    }
                    break;

                case 0xC000:
                    if (VROM_1K_SIZE != 0)
                    {
                        SetVROM_1K_Bank(4, data);
                    }
                    else
                    {
                        SetCRAM_1K_Bank(4, data);
                    }
                    break;

                case 0xC008:
                case 0xC010:
                    if (VROM_1K_SIZE != 0)
                    {
                        SetVROM_1K_Bank(5, data);
                    }
                    else
                    {
                        SetCRAM_1K_Bank(5, data);
                    }
                    break;

                case 0xD000:
                    if (VROM_1K_SIZE != 0)
                    {
                        SetVROM_1K_Bank(6, data);
                    }
                    else
                    {
                        SetCRAM_1K_Bank(6, data);
                    }
                    break;

                case 0xD008:
                case 0xD010:
                    if (VROM_1K_SIZE != 0)
                    {
                        SetVROM_1K_Bank(7, data);
                    }
                    else
                    {
                        SetCRAM_1K_Bank(7, data);
                    }
                    break;

                case 0xE000:
                    data &= 0x03;
                    if (data == 0) SetVRAM_Mirror(VRAM_VMIRROR);
                    else if (data == 1) SetVRAM_Mirror(VRAM_HMIRROR);
                    else if (data == 2) SetVRAM_Mirror(VRAM_MIRROR4L);
                    else SetVRAM_Mirror(VRAM_MIRROR4H);
                    break;

                case 0xE008:
                case 0xE010:
                    irq_latch = data;
                    break;

                case 0xF000:
                    irq_enable = (byte)(data & 0x03);
                    irq_counter = irq_latch;
                    irq_clock = 0;
                    nes.cpu.ClrIRQ(IRQ_MAPPER);
                    break;

                case 0xF008:
                case 0xF010:
                    irq_enable = (byte)((irq_enable & 0x01) * 3);
                    nes.cpu.ClrIRQ(IRQ_MAPPER);
                    break;
            }
        }

        //void Mapper085::Clock(INT cycles)
        public override void Clock(int cycles)
        {
            if ((irq_enable & 0x02) != 0)
            {
                irq_clock += cycles * 4;
                while (irq_clock >= 455)
                {
                    irq_clock -= 455;
                    irq_counter++;
                    if (irq_counter == 0)
                    {
                        irq_counter = irq_latch;
                        nes.cpu.SetIRQ(IRQ_MAPPER);
                    }
                }
            }
        }

        //void Mapper085::SaveState(LPBYTE p)
        public override void SaveState(byte[] p)
        {
            p[0] = irq_enable;
            p[1] = irq_counter;
            p[2] = irq_latch;
            //*((INT*)&p[4]) = irq_clock;
            BitConverter.GetBytes(irq_clock).CopyTo(p, 4);
        }

        //void Mapper085::LoadState(LPBYTE p)
        public override void LoadState(byte[] p)
        {
            irq_enable = p[0];
            irq_counter = p[1];
            irq_latch = p[2];
            //irq_clock = *((INT*)&p[4]);
            irq_clock = BitConverter.ToInt32(p, 4);
        }

        public override bool IsStateSave()
        {
            return true;
        }

    }
}