AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper255.cs

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2024-08-03 22:26:53 +08:00
using Codice.CM.Client.Differences;
using System;
namespace VirtualNes.Core
{
public class Mapper255 : Mapper
{
byte[] reg = new byte[4];
public Mapper255(NES parent) : base(parent)
{
}
public override void Reset()
{
MMU.SetPROM_32K_Bank(0);
MMU.SetVROM_8K_Bank(0);
MMU.SetVRAM_Mirror(MMU.VRAM_VMIRROR);
reg[0] = 0;
reg[1] = 0;
reg[2] = 0;
reg[3] = 0;
}
//BYTE Mapper255::ReadLow(WORD addr, BYTE data)
//{
// if (addr >= 0x5800)
// {
// return reg[addr & 0x0003] & 0x0F;
// }
// else
// {
// return addr >> 8;
// }
//}
public override byte ReadLow(ushort addr)
{
if (addr >= 0x5800)
{
return (byte)(reg[addr & 0x0003] & 0x0F);
}
else
{
return (byte)(addr >> 8);
}
}
public override void WriteLow(ushort addr, byte data)
{
if (addr >= 0x5800)
{
reg[addr & 0x0003] = (byte)(data & 0x0F);
}
}
public override void Write(ushort addr, byte data)
{
byte prg = (byte)((addr & 0x0F80) >> 7);
int chr = (byte)((addr & 0x003F));
int bank = (byte)((addr & 0x4000) >> 14);
if ((addr & 0x2000) != 0 )
{
MMU.SetVRAM_Mirror(MMU.VRAM_HMIRROR);
}
else
{
MMU.SetVRAM_Mirror(MMU.VRAM_VMIRROR);
}
if ((addr & 0x1000) !=0)
{
if ((addr & 0x0040) != 0)
{
MMU.SetPROM_8K_Bank(4, 0x80 * bank + prg * 4 + 2);
MMU.SetPROM_8K_Bank(5, 0x80 * bank + prg * 4 + 3);
MMU.SetPROM_8K_Bank(6, 0x80 * bank + prg * 4 + 2);
MMU.SetPROM_8K_Bank(7, 0x80 * bank + prg * 4 + 3);
}
else
{
MMU.SetPROM_8K_Bank(4, 0x80 * bank + prg * 4 + 0);
MMU.SetPROM_8K_Bank(5, 0x80 * bank + prg * 4 + 1);
MMU.SetPROM_8K_Bank(6, 0x80 * bank + prg * 4 + 0);
MMU.SetPROM_8K_Bank(7, 0x80 * bank + prg * 4 + 1);
}
}
else
{
MMU.SetPROM_8K_Bank(4, 0x80 * bank + prg * 4 + 0);
MMU.SetPROM_8K_Bank(5, 0x80 * bank + prg * 4 + 1);
MMU.SetPROM_8K_Bank(6, 0x80 * bank + prg * 4 + 2);
MMU.SetPROM_8K_Bank(7, 0x80 * bank + prg * 4 + 3);
}
MMU.SetVROM_1K_Bank(0, 0x200 * bank + chr * 8 + 0);
MMU.SetVROM_1K_Bank(1, 0x200 * bank + chr * 8 + 1);
MMU.SetVROM_1K_Bank(2, 0x200 * bank + chr * 8 + 2);
MMU.SetVROM_1K_Bank(3, 0x200 * bank + chr * 8 + 3);
MMU.SetVROM_1K_Bank(4, 0x200 * bank + chr * 8 + 4);
MMU.SetVROM_1K_Bank(5, 0x200 * bank + chr * 8 + 5);
MMU.SetVROM_1K_Bank(6, 0x200 * bank + chr * 8 + 6);
MMU.SetVROM_1K_Bank(7, 0x200 * bank + chr * 8 + 7);
}
// For state save
public override bool IsStateSave()
{
return true;
}
public override void SaveState(byte[] p)
{
p[0] = reg[0];
p[1] = reg[1];
p[2] = reg[2];
p[3] = reg[3];
}
public override void LoadState(byte[] p)
{
reg[0] = p[0];
reg[1] = p[1];
reg[2] = p[2];
reg[3] = p[3];
}
}
}