AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper164.cs

166 lines
4.9 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper164 Pocket Monster Gold //
//////////////////////////////////////////////////////////////////////////
using System;
using VirtualNes.Core.Debug;
using static VirtualNes.MMU;
using BYTE = System.Byte;
using INT = System.Int32;
namespace VirtualNes.Core
{
public class Mapper164 : Mapper
{
BYTE reg5000;
BYTE reg5100;
BYTE a3, p_mode;
public Mapper164(NES parent) : base(parent)
{
}
public override void Reset()
{
reg5000 = 0;
reg5100 = 0;
SetBank_CPU();
SetBank_PPU();
nes.ppu.SetExtLatchMode(true);
}
//void Mapper164::WriteLow(WORD addr, BYTE data)
public override void WriteLow(ushort addr, byte data)
{
if (addr == 0x5000)
{
p_mode = (byte)(data >> 7);
reg5000 = data;
SetBank_CPU();
SetBank_PPU();
}
else if (addr == 0x5100)
{
reg5100 = data;
SetBank_CPU();
SetBank_PPU();
}
else if (addr >= 0x6000)
{
CPU_MEM_BANK[addr >> 13][addr & 0x1FFF] = data;
}
else
{
Debuger.Log($"write to {addr:X4}:{data:X2}");
}
}
void SetBank_CPU()
{
int mode, @base, bank;
@base = (reg5100 & 1) << 5;
mode = (reg5000 >> 4) & 0x07;
switch (mode)
{
case 0:
case 2:
case 4:
case 6: /* NORMAL MODE */
bank = (reg5000 & 0x0f);
bank += (reg5000 & 0x20) >> 1;
SetPROM_16K_Bank(4, bank + @base);
SetPROM_16K_Bank(6, @base + 0x1f);
Debuger.Log($"-- normal mode: mode={mode}, bank={bank} --");
break;
case 1:
case 3: /* REG MODE */
Debuger.Log("-- reg mode --");
break;
case 5: /* 32K MODE */
bank = (reg5000 & 0x0f);
SetPROM_32K_Bank(bank + (@base >> 1));
// DEBUGOUT("-- 32K MODE: bank=%02x --\n", bank);
break;
case 7: /* HALF MODE */
bank = (reg5000 & 0x0f);
bank += (bank & 0x08) << 1;
SetPROM_16K_Bank(4, bank + @base);
bank = (bank & 0x10) + 0x0f;
SetPROM_16K_Bank(6, @base + 0x1f);
Debuger.Log("-- half mode --");
break;
default:
break;
};
}
void SetBank_PPU()
{
SetCRAM_8K_Bank(0);
}
//void Mapper164::PPU_ExtLatchX(INT x)
public override void PPU_ExtLatchX(int x)
{
a3 = (byte)((x & 1) << 3);
}
//void Mapper164::PPU_ExtLatch(WORD ntbladr, BYTE& chr_l, BYTE& chr_h, BYTE& attr )
public override void PPU_ExtLatch(ushort ntbladr, ref byte chr_l, ref byte chr_h, ref byte attr)
{
INT loopy_v = nes.ppu.GetPPUADDR();
INT loopy_y = nes.ppu.GetTILEY();
INT tileofs = (PPUREG[0] & PPU.PPU_BGTBL_BIT) << 8;
INT attradr = 0x23C0 + (loopy_v & 0x0C00) + ((loopy_v & 0x0380) >> 4);
INT attrsft = (ntbladr & 0x0040) >> 4;
Span<byte> pNTBL = PPU_MEM_BANK[ntbladr >> 10];
INT ntbl_x = ntbladr & 0x001F;
INT tileadr;
attradr &= 0x3FF;
attr = (byte)(((pNTBL[attradr + (ntbl_x >> 2)] >> ((ntbl_x & 2) + attrsft)) & 3) << 2);
tileadr = tileofs + pNTBL[ntbladr & 0x03FF] * 0x10 + loopy_y;
if (p_mode != 0)
{
tileadr = (tileadr & 0xfff7) | a3;
chr_l = chr_h = PPU_MEM_BANK[tileadr >> 10][tileadr & 0x03FF];
}
else
{
chr_l = PPU_MEM_BANK[tileadr >> 10][tileadr & 0x03FF];
chr_h = PPU_MEM_BANK[tileadr >> 10][(tileadr & 0x03FF) + 8];
}
}
//void Mapper164::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
p[0] = reg5000;
p[1] = reg5100;
p[2] = a3;
p[3] = p_mode;
}
//void Mapper164::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
reg5000 = p[0];
reg5100 = p[1];
a3 = p[2];
p_mode = p[3];
}
public override bool IsStateSave()
{
return true;
}
}
}