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