AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper109.cs

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2024-08-04 23:37:02 +08:00
//////////////////////////////////////////////////////////////////////////
// Mapper109 SACHEN The Great Wall SA-019 //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using static VirtualNes.Core.CPU;
using INT = System.Int32;
using BYTE = System.Byte;
using System;
using Codice.CM.Client.Differences;
namespace VirtualNes.Core
{
public class Mapper109 : Mapper
{
BYTE reg;
BYTE chr0, chr1, chr2, chr3;
BYTE chrmode0, chrmode1;
public Mapper109(NES parent) : base(parent)
{
}
public override void Reset()
{
reg = 0;
SetPROM_32K_Bank(0);
chr0 = 0;
chr1 = 0;
chr2 = 0;
chr3 = 0;
SetBank_PPU();
chrmode0 = 0;
chrmode1 = 0;
}
//void Mapper109::WriteLow(WORD addr, BYTE data)
public override void WriteLow(ushort addr, byte data)
{
switch (addr)
{
case 0x4100:
reg = data;
break;
case 0x4101:
switch (reg)
{
case 0:
chr0 = data;
SetBank_PPU();
break;
case 1:
chr1 = data;
SetBank_PPU();
break;
case 2:
chr2 = data;
SetBank_PPU();
break;
case 3:
chr3 = data;
SetBank_PPU();
break;
case 4:
chrmode0 = (byte)(data & 0x01);
SetBank_PPU();
break;
case 5:
SetPROM_32K_Bank(data & 0x07);
break;
case 6:
chrmode1 = (byte)(data & 0x07);
SetBank_PPU();
break;
case 7:
if ((data & 0x01) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
else SetVRAM_Mirror(VRAM_VMIRROR);
break;
}
break;
}
}
void SetBank_PPU()
{
if (VROM_1K_SIZE != 0)
{
SetVROM_1K_Bank(0, chr0);
SetVROM_1K_Bank(1, chr1 | ((chrmode1 << 3) & 0x8));
SetVROM_1K_Bank(2, chr2 | ((chrmode1 << 2) & 0x8));
SetVROM_1K_Bank(3, chr3 | ((chrmode1 << 1) & 0x8) | (chrmode0 * 0x10));
SetVROM_1K_Bank(4, VROM_1K_SIZE - 4);
SetVROM_1K_Bank(5, VROM_1K_SIZE - 3);
SetVROM_1K_Bank(6, VROM_1K_SIZE - 2);
SetVROM_1K_Bank(7, VROM_1K_SIZE - 1);
}
}
//void Mapper109::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
p[0] = reg;
p[1] = chr0;
p[2] = chr1;
p[3] = chr2;
p[4] = chr3;
p[5] = chrmode0;
p[6] = chrmode1;
}
//void Mapper109::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
reg = p[0];
chr0 = p[1];
chr1 = p[2];
chr2 = p[3];
chr3 = p[4];
chrmode0 = p[5];
chrmode1 = p[6];
}
public override bool IsStateSave()
{
return true;
}
}
}