AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper100.cs
2024-08-04 23:37:02 +08:00

302 lines
5.2 KiB
C#

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 Mapper100 : Mapper
{
BYTE[] reg = new byte[8];
BYTE prg0, prg1, prg2, prg3;
BYTE chr0, chr1, chr2, chr3, chr4, chr5, chr6, chr7;
BYTE irq_enable;
BYTE irq_counter;
BYTE irq_latch;
public Mapper100(NES parent) : base(parent)
{
}
public override void Reset()
{
for (INT i = 0; i < 8; i++)
{
reg[i] = 0x00;
}
prg0 = 0;
prg1 = 1;
prg2 = (byte)(PROM_8K_SIZE - 2);
prg3 = (byte)(PROM_8K_SIZE - 1);
SetBank_CPU();
if (VROM_1K_SIZE != 0)
{
chr0 = 0;
chr1 = 1;
chr2 = 2;
chr3 = 3;
chr4 = 4;
chr5 = 5;
chr6 = 6;
chr7 = 7;
SetBank_PPU();
}
else
{
chr0 = chr2 = chr4 = chr5 = chr6 = chr7 = 0;
chr1 = chr3 = 1;
}
irq_enable = 0; // Disable
irq_counter = 0;
irq_latch = 0;
}
//void Mapper100::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
switch (addr & 0xE001)
{
case 0x8000:
reg[0] = data;
break;
case 0x8001:
reg[1] = data;
switch (reg[0] & 0xC7)
{
case 0x00:
if (VROM_1K_SIZE != 0)
{
chr0 = (byte)(data & 0xFE);
chr1 = (byte)(chr0 + 1);
SetBank_PPU();
}
break;
case 0x01:
if (VROM_1K_SIZE != 0)
{
chr2 = (byte)(data & 0xFE);
chr3 = (byte)(chr2 + 1);
SetBank_PPU();
}
break;
case 0x02:
if (VROM_1K_SIZE != 0)
{
chr4 = data;
SetBank_PPU();
}
break;
case 0x03:
if (VROM_1K_SIZE != 0)
{
chr5 = data;
SetBank_PPU();
}
break;
case 0x04:
if (VROM_1K_SIZE != 0)
{
chr6 = data;
SetBank_PPU();
}
break;
case 0x05:
if (VROM_1K_SIZE != 0)
{
chr7 = data;
SetBank_PPU();
}
break;
case 0x06:
prg0 = data;
SetBank_CPU();
break;
case 0x07:
prg1 = data;
SetBank_CPU();
break;
case 0x46:
prg2 = data;
SetBank_CPU();
break;
case 0x47:
prg3 = data;
SetBank_CPU();
break;
case 0x80:
if (VROM_1K_SIZE != 0)
{
chr4 = (byte)(data & 0xFE);
chr5 = (byte)(chr4 + 1);
SetBank_PPU();
}
break;
case 0x81:
if (VROM_1K_SIZE != 0)
{
chr6 = (byte)(data & 0xFE);
chr7 = (byte)(chr6 + 1);
SetBank_PPU();
}
break;
case 0x82:
if (VROM_1K_SIZE != 0)
{
chr0 = data;
SetBank_PPU();
}
break;
case 0x83:
if (VROM_1K_SIZE != 0)
{
chr1 = data;
SetBank_PPU();
}
break;
case 0x84:
if (VROM_1K_SIZE != 0)
{
chr2 = data;
SetBank_PPU();
}
break;
case 0x85:
if (VROM_1K_SIZE != 0)
{
chr3 = data;
SetBank_PPU();
}
break;
}
break;
case 0xA000:
reg[2] = data;
if (!nes.rom.Is4SCREEN())
{
if ((data & 0x01) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
else SetVRAM_Mirror(VRAM_VMIRROR);
}
break;
case 0xA001:
reg[3] = data;
break;
case 0xC000:
reg[4] = data;
irq_counter = data;
break;
case 0xC001:
reg[5] = data;
irq_latch = data;
break;
case 0xE000:
reg[6] = data;
irq_enable = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xE001:
reg[7] = data;
irq_enable = 0xFF;
break;
}
}
//void Mapper100::HSync(INT scanline)
public override void HSync(int scanline)
{
if ((scanline >= 0 && scanline <= 239))
{
if (nes.ppu.IsDispON())
{
if (irq_enable != 0)
{
if ((irq_counter--) == 0)
{
irq_counter = irq_latch;
// nes.cpu.IRQ();
nes.cpu.SetIRQ(IRQ_MAPPER);
}
}
}
}
}
void SetBank_CPU()
{
SetPROM_32K_Bank(prg0, prg1, prg2, prg3);
}
void SetBank_PPU()
{
if (VROM_1K_SIZE != 0)
{
SetVROM_8K_Bank(chr0, chr1, chr2, chr3, chr4, chr5, chr6, chr7);
}
}
//void Mapper100::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
for (byte i = 0; i < 8; i++)
{
p[i] = reg[i];
}
p[8] = prg0;
p[9] = prg1;
p[10] = prg2;
p[11] = prg3;
p[12] = chr0;
p[13] = chr1;
p[14] = chr2;
p[15] = chr3;
p[16] = chr4;
p[17] = chr5;
p[18] = chr6;
p[19] = chr7;
p[20] = irq_enable;
p[21] = irq_counter;
p[22] = irq_latch;
}
//void Mapper100::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
for (byte i = 0; i < 8; i++)
{
reg[i] = p[i];
}
prg0 = p[8];
prg1 = p[9];
prg2 = p[10];
prg3 = p[11];
chr0 = p[12];
chr1 = p[13];
chr2 = p[14];
chr3 = p[15];
chr4 = p[16];
chr5 = p[17];
chr6 = p[18];
chr7 = p[19];
irq_enable = p[20];
irq_counter = p[21];
irq_latch = p[22];
}
public override bool IsStateSave()
{
return true;
}
}
}