AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper187.cs

372 lines
12 KiB
C#
Raw Normal View History

2024-08-03 23:15:19 +08:00
//////////////////////////////////////////////////////////////////////////
// Mapper187 Street Fighter Zero 2 97 //
//////////////////////////////////////////////////////////////////////////
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 Mapper187 : Mapper
{
BYTE[] prg = new byte[4];
INT[] chr = new int[8];
BYTE[] bank = new byte[8];
BYTE ext_mode;
BYTE chr_mode;
BYTE ext_enable;
BYTE irq_enable;
BYTE irq_counter;
BYTE irq_latch;
BYTE irq_occur;
BYTE last_write;
public Mapper187(NES parent) : base(parent)
{
}
public override void Reset()
{
INT i;
for (i = 0; i < 8; i++)
{
chr[i] = 0x00;
bank[i] = 0x00;
}
prg[0] = (byte)(PROM_8K_SIZE - 4);
prg[1] = (byte)(PROM_8K_SIZE - 3);
prg[2] = (byte)(PROM_8K_SIZE - 2);
prg[3] = (byte)(PROM_8K_SIZE - 1);
SetBank_CPU();
ext_mode = 0;
chr_mode = 0;
ext_enable = 0;
irq_enable = 0;
irq_counter = 0;
irq_latch = 0;
last_write = 0;
nes.SetRenderMethod(EnumRenderMethod.POST_ALL_RENDER);
}
//BYTE Mapper187::ReadLow(WORD addr)
public override byte ReadLow(ushort addr)
{
switch (last_write & 0x03)
{
case 0:
return 0x83;
case 1:
return 0x83;
case 2:
return 0x42;
case 3:
return 0x00;
}
return 0;
}
//void Mapper187::WriteLow(WORD addr, BYTE data)
public override void WriteLow(ushort addr, byte data)
{
last_write = data;
if (addr == 0x5000)
{
ext_mode = data;
if ((data & 0x80) != 0)
{
if ((data & 0x20) != 0)
{
prg[0] = (byte)(((data & 0x1E) << 1) + 0);
prg[1] = (byte)(((data & 0x1E) << 1) + 1);
prg[2] = (byte)(((data & 0x1E) << 1) + 2);
prg[3] = (byte)(((data & 0x1E) << 1) + 3);
}
else
{
prg[2] = (byte)(((data & 0x1F) << 1) + 0);
prg[3] = (byte)(((data & 0x1F) << 1) + 1);
}
}
else
{
prg[0] = bank[6];
prg[1] = bank[7];
prg[2] = (byte)(PROM_8K_SIZE - 2);
prg[3] = (byte)(PROM_8K_SIZE - 1);
}
SetBank_CPU();
}
}
//void Mapper187::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
last_write = data;
switch (addr)
{
case 0x8003:
ext_enable = 0xFF;
// if( (data&0x80) != (chr_mode&0x80) ) {
// for( INT i = 0; i < 4; i++ ) {
// INT temp = chr[i];
// chr[i] = chr[i+4];
// chr[i+4] = temp;
// }
// SetBank_PPU();
// }
chr_mode = data;
if ((data & 0xF0) == 0)
{
prg[2] = (byte)(PROM_8K_SIZE - 2);
SetBank_CPU();
}
break;
case 0x8000:
ext_enable = 0;
// if( (data&0x80) != (chr_mode&0x80) ) {
// for( INT i = 0; i < 4; i++ ) {
// INT temp = chr[i];
// chr[i] = chr[i+4];
// chr[i+4] = temp;
// }
// SetBank_PPU();
// }
chr_mode = data;
break;
case 0x8001:
if (ext_enable == 0)
{
switch (chr_mode & 7)
{
case 0:
data &= 0xFE;
chr[4] = (INT)data + 0x100;
chr[5] = (INT)data + 0x100 + 1;
// chr[0+((chr_mode&0x80)?4:0)] = data;
// chr[1+((chr_mode&0x80)?4:0)] = data+1;
SetBank_PPU();
break;
case 1:
data &= 0xFE;
chr[6] = (INT)data + 0x100;
chr[7] = (INT)data + 0x100 + 1;
// chr[2+((chr_mode&0x80)?4:0)] = data;
// chr[3+((chr_mode&0x80)?4:0)] = data+1;
SetBank_PPU();
break;
case 2:
chr[0] = data;
// chr[0+((chr_mode&0x80)?0:4)] = data;
SetBank_PPU();
break;
case 3:
chr[1] = data;
// chr[1+((chr_mode&0x80)?0:4)] = data;
SetBank_PPU();
break;
case 4:
chr[2] = data;
// chr[2+((chr_mode&0x80)?0:4)] = data;
SetBank_PPU();
break;
case 5:
chr[3] = data;
// chr[3+((chr_mode&0x80)?0:4)] = data;
SetBank_PPU();
break;
case 6:
if ((ext_mode & 0xA0) != 0xA0)
{
prg[0] = data;
SetBank_CPU();
}
break;
case 7:
if ((ext_mode & 0xA0) != 0xA0)
{
prg[1] = data;
SetBank_CPU();
}
break;
default:
break;
}
}
else
{
switch (chr_mode)
{
case 0x2A:
prg[1] = 0x0F;
break;
case 0x28:
prg[2] = 0x17;
break;
case 0x26:
break;
default:
break;
}
SetBank_CPU();
}
bank[chr_mode & 7] = data;
break;
case 0xA000:
if ((data & 0x01) != 0)
{
SetVRAM_Mirror(VRAM_HMIRROR);
}
else
{
SetVRAM_Mirror(VRAM_VMIRROR);
}
break;
case 0xA001:
break;
case 0xC000:
irq_counter = data;
irq_occur = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xC001:
irq_latch = data;
irq_occur = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xE000:
case 0xE002:
irq_enable = 0;
irq_occur = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xE001:
case 0xE003:
irq_enable = 1;
irq_occur = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
}
}
//void Mapper187::Clock(INT cycles)
public override void Clock(int cycles)
{
// if( irq_occur ) {
// nes.cpu.IRQ_NotPending();
// }
}
// void Mapper187::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_enable = 0;
irq_occur = 0xFF;
nes.cpu.SetIRQ(IRQ_MAPPER);
}
else
{
irq_counter--;
}
}
}
}
}
void SetBank_CPU()
{
SetPROM_32K_Bank(prg[0], prg[1], prg[2], prg[3]);
}
void SetBank_PPU()
{
SetVROM_8K_Bank(chr[0], chr[1], chr[2], chr[3],
chr[4], chr[5], chr[6], chr[7]);
}
//void Mapper187::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
//INT i;
//for (i = 0; i < 4; i++)
//{
// p[i] = prg[i];
//}
//for (i = 0; i < 8; i++)
//{
// p[4 + i] = bank[i];
//}
//for (i = 0; i < 8; i++)
//{
// *((INT*)&p[12 + i * sizeof(INT)]) = chr[i];
//}
//p[44] = ext_mode;
//p[45] = chr_mode;
//p[46] = ext_enable;
//p[47] = irq_enable;
//p[48] = irq_counter;
//p[49] = irq_latch;
//p[50] = irq_occur;
//p[51] = last_write;
}
//void Mapper187::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
//INT i;
//for (i = 0; i < 4; i++)
//{
// prg[i] = p[i];
//}
//for (i = 0; i < 8; i++)
//{
// bank[i] = p[4 + i];
//}
//for (i = 0; i < 8; i++)
//{
// chr[i] = *((INT*)&p[12 + i * sizeof(INT)]);
//}
//ext_mode = p[44];
//chr_mode = p[45];
//ext_enable = p[46];
//irq_enable = p[47];
//irq_counter = p[48];
//irq_latch = p[49];
//irq_occur = p[50];
//last_write = p[51];
}
public override bool IsStateSave()
{
return true;
}
}
}