forked from sin365/AxibugEmuOnline
830 lines
24 KiB
C#
830 lines
24 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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using VirtualNes.Core.Debug;
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namespace VirtualNes.Core
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{
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public class NES
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{
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public const int FETCH_CYCLES = 8;
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public CPU cpu;
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public PPU ppu;
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public APU apu;
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public ROM rom;
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public PAD pad;
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public Mapper mapper;
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public NesConfig nescfg;
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private List<CHEATCODE> m_CheatCode = new List<CHEATCODE>();
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private List<GENIECODE> m_GenieCode = new List<GENIECODE>();
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private bool m_bDiskThrottle;
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private int m_CommandRequest;
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private int m_nSnapNo;
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private bool m_bNsfPlaying;
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private bool m_bNsfInit;
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private int m_nNsfSongNo;
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private int m_nNsfSongMode;
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private bool m_bMoviePlay;
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private bool m_bMovieRec;
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private Stream m_fpMovie;
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private bool m_bTapePlay;
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private bool m_bTapeRec;
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private Stream m_fpTape;
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private double m_TapeCycles;
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private byte m_TapeIn;
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private byte m_TapeOut;
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// For Barcode
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private bool m_bBarcode;
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private byte m_BarcodeOut;
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private byte m_BarcodePtr;
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private int m_BarcodeCycles;
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private byte[] m_BarcodeData = new byte[256];
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// For Barcode
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private bool m_bBarcode2;
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private int m_Barcode2seq;
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private int m_Barcode2ptr;
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private int m_Barcode2cnt;
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private byte m_Barcode2bit;
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private byte[] m_Barcode2data = new byte[32];
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private int m_TurboFileBank;
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private int SAVERAM_SIZE;
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private int nIRQtype;
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private bool bFrameIRQ;
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private bool bVideoMode;
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private int NES_scanline;
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private EnumRenderMethod RenderMethod;
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private bool bZapper;
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private long base_cycles;
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private long emul_cycles;
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public NES(string fname)
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{
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Debuger.Log("VirtuaNES - CSharpCore\n");
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m_bDiskThrottle = false;
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m_CommandRequest = 0;
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m_nSnapNo = 0;
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m_bNsfPlaying = false;
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m_bMoviePlay = m_bMovieRec = false;
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m_fpMovie = null;
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m_bTapePlay = m_bTapeRec = false;
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m_fpTape = null;
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m_TapeCycles = 0d;
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m_TapeIn = m_TapeOut = 0;
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m_bBarcode2 = false;
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m_TurboFileBank = 0;
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cpu = null;
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ppu = null;
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apu = null;
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rom = null;
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pad = null;
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mapper = null;
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SAVERAM_SIZE = 8 * 1024;
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nIRQtype = 0;
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bFrameIRQ = true;
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bVideoMode = false;
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nescfg = NesConfig.NESCONFIG_NTSC;
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CheatInitial();
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try
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{
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Debuger.Log("Allocating CPU...");
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cpu = new CPU(this);
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Debuger.Log("Allocating PPU...");
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ppu = new PPU(this);
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Debuger.Log("Allocating APU...");
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apu = new APU(this);
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Debuger.Log("Allocating PAD...");
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pad = new PAD(this);
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Debuger.Log("Loading ROM Image...");
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rom = new ROM(fname);
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}
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catch (Exception ex)
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{
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Debuger.LogError(ex.ToString());
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}
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}
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public void Command(NESCOMMAND cmd)
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{
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CommandParam(cmd, 0);
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}
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public bool CommandParam(NESCOMMAND cmd, int param)
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{
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switch (cmd)
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{
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case NESCOMMAND.NESCMD_NONE: break;
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case NESCOMMAND.NESCMD_HWRESET:
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Reset();
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m_CommandRequest = (int)cmd;
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break;
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case NESCOMMAND.NESCMD_SWRESET:
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SoftReset();
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m_CommandRequest = (int)cmd;
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break;
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default:
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throw new NotImplementedException($"{cmd} not impl right now");
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}
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return true;
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}
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public void CheatInitial()
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{
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m_CheatCode.Clear();
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}
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public void EmulateFrame(bool bDraw)
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{
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int scanline = 0;
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if (rom.IsNSF())
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{
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EmulateNSF();
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return;
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}
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CheatCodeProcess();
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NES_scanline = scanline;
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if (RenderMethod != EnumRenderMethod.TILE_RENDER)
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{
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bZapper = false;
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while (true)
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{
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ppu.SetRenderScanline(scanline);
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if (scanline == 0)
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{
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if (RenderMethod < EnumRenderMethod.POST_RENDER)
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{
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EmulationCPU(nescfg.ScanlineCycles);
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ppu.FrameStart();
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ppu.ScanlineNext();
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mapper.HSync(scanline);
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ppu.ScanlineStart();
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}
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else
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{
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EmulationCPU(nescfg.HDrawCycles);
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ppu.FrameStart();
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ppu.ScanlineNext();
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mapper.HSync(scanline);
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EmulationCPU(FETCH_CYCLES * 32);
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ppu.ScanlineStart();
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EmulationCPU(FETCH_CYCLES * 10 + nescfg.ScanlineEndCycles);
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}
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}
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else if (scanline < 240)
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{
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}
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}
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}
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}
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internal void EmulationCPU(int basecycles)
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{
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int cycles;
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base_cycles += basecycles;
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cycles = (int)((base_cycles / 12) - emul_cycles);
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if (cycles > 0)
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{
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emul_cycles += cpu.EXEC(cycles);
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}
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}
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internal void Reset()
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{
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SaveSRAM();
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SaveDISK();
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SaveTurboFile();
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// RAM Clear
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MemoryUtility.ZEROMEMORY(MMU.RAM, (uint)MMU.RAM.Length);
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if (rom.GetPROM_CRC() == 0x29401686)
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{ // Minna no Taabou no Nakayoshi Dai Sakusen(J)
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MemoryUtility.memset(MMU.RAM, 0xFF, (uint)MMU.RAM.Length);
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}
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// RAM set
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if (!rom.IsSAVERAM() && rom.GetMapperNo() != 20)
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{
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MemoryUtility.memset(MMU.WRAM, 0xFF, (uint)MMU.WRAM.Length);
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}
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MemoryUtility.ZEROMEMORY(MMU.CRAM, (uint)MMU.CRAM.Length);
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MemoryUtility.ZEROMEMORY(MMU.VRAM, (uint)MMU.VRAM.Length);
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MemoryUtility.ZEROMEMORY(MMU.SPRAM, (uint)MMU.SPRAM.Length);
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MemoryUtility.ZEROMEMORY(MMU.BGPAL, (uint)MMU.BGPAL.Length);
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MemoryUtility.ZEROMEMORY(MMU.SPPAL, (uint)MMU.SPPAL.Length);
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MemoryUtility.ZEROMEMORY(MMU.CPUREG, (uint)MMU.CPUREG.Length);
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MemoryUtility.ZEROMEMORY(MMU.PPUREG, (uint)MMU.PPUREG.Length);
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m_bDiskThrottle = false;
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SetRenderMethod(EnumRenderMethod.PRE_RENDER);
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if (rom.IsPAL())
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{
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SetVideoMode(true);
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}
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MMU.PROM = rom.GetPROM();
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MMU.VROM = rom.GetVROM();
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MMU.PROM_8K_SIZE = rom.GetPROM_SIZE() * 2;
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MMU.PROM_16K_SIZE = rom.GetPROM_SIZE();
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MMU.PROM_32K_SIZE = rom.GetPROM_SIZE() / 2;
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MMU.VROM_1K_SIZE = rom.GetVROM_SIZE() * 8;
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MMU.VROM_2K_SIZE = rom.GetVROM_SIZE() * 4;
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MMU.VROM_4K_SIZE = rom.GetVROM_SIZE() * 2;
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MMU.VROM_8K_SIZE = rom.GetVROM_SIZE();
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// <20>f<EFBFBD>t<EFBFBD>H<EFBFBD><48><EFBFBD>g<EFBFBD>o<EFBFBD><6F><EFBFBD>N
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if (MMU.VROM_8K_SIZE != 0)
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{
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MMU.SetVROM_8K_Bank(0);
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}
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else
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{
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MMU.SetCRAM_8K_Bank(0);
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}
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// <20>~<7E><><EFBFBD>[
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if (rom.Is4SCREEN())
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{
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MMU.SetVRAM_Mirror(MMU.VRAM_MIRROR4);
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}
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else if (rom.IsVMIRROR())
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{
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MMU.SetVRAM_Mirror(MMU.VRAM_VMIRROR);
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}
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else
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{
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MMU.SetVRAM_Mirror(MMU.VRAM_HMIRROR);
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}
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apu.SelectExSound(0);
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ppu.Reset();
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mapper.Reset();
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// Trainer
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if (rom.IsTRAINER())
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{
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Array.Copy(rom.GetTRAINER(), 0, MMU.WRAM, 0x1000, 512);
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}
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pad.Reset();
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cpu.Reset();
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apu.Reset();
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if (rom.IsNSF())
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{
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mapper.Reset();
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}
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base_cycles = emul_cycles = 0;
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}
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internal void SetVideoMode(bool bMode)
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{
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bVideoMode = bMode;
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if (!bVideoMode)
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{
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nescfg = NesConfig.NESCONFIG_NTSC;
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}
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else
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{
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nescfg = NesConfig.NESCONFIG_PAL;
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}
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apu.SoundSetup();
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}
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public void SetRenderMethod(EnumRenderMethod type)
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{
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RenderMethod = type;
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}
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internal void SoftReset()
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{
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pad.Reset();
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cpu.Reset();
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apu.Reset();
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if (rom.IsNSF())
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{
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mapper.Reset();
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}
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m_bDiskThrottle = false;
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base_cycles = emul_cycles = 0;
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}
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internal void EmulateNSF()
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{
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R6502 reg = null;
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ppu.Reset();
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mapper.VSync();
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//DEBUGOUT( "Frame\n" );
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if (m_bNsfPlaying)
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{
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if (m_bNsfInit)
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{
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MemoryUtility.ZEROMEMORY(MMU.RAM, (uint)MMU.RAM.Length);
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if ((rom.GetNsfHeader().ExtraChipSelect & 0x04) == 0)
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{
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MemoryUtility.ZEROMEMORY(MMU.RAM, 0x2000);
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}
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apu.Reset();
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apu.Write(0x4015, 0x0F);
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apu.Write(0x4017, 0xC0);
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apu.ExWrite(0x4080, 0x80); // FDS Volume 0
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apu.ExWrite(0x408A, 0xE8); // FDS Envelope Speed
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cpu.GetContext(ref reg);
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reg.PC = 0x4710; // Init Address
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reg.A = (byte)m_nNsfSongNo;
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reg.X = (byte)m_nNsfSongMode;
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reg.Y = 0;
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reg.S = 0xFF;
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reg.P = CPU.Z_FLAG | CPU.R_FLAG | CPU.I_FLAG;
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// <20><><EFBFBD>S<EFBFBD><EFBFBD><CE8D><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˂Ă<CB82><C482><EFBFBD><EFBFBD>ă<EFBFBD><C483>[<5B>v<EFBFBD><76>(1<>b<EFBFBD><62>)
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for (int i = 0; i < nescfg.TotalScanlines * 60; i++)
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{
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EmulationCPU(nescfg.ScanlineCycles);
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cpu.GetContext(ref reg);
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>[<5B>v<EFBFBD>ɓ<EFBFBD><C993><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƃ<EFBFBD><C682>m<EFBFBD>F<EFBFBD><46><EFBFBD><EFBFBD><EFBFBD>甲<EFBFBD><E794B2><EFBFBD><EFBFBD>
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if (reg.PC == 0x4700)
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{
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break;
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}
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}
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m_bNsfInit = false;
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}
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cpu.GetContext(ref reg);
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>[<5B>v<EFBFBD>ɓ<EFBFBD><C993><EFBFBD><EFBFBD>Ă<EFBFBD><C482><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Đݒ肷<DD92><E882B7>
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if (reg.PC == 0x4700)
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{
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reg.PC = 0x4720; // Play Address
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reg.A = 0;
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reg.S = 0xFF;
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}
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for (int i = 0; i < nescfg.TotalScanlines; i++)
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{
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EmulationCPU(nescfg.ScanlineCycles);
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}
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}
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else
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{
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cpu.GetContext(ref reg);
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reg.PC = 0x4700; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>[<5B>v
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reg.S = 0xFF;
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EmulationCPU(nescfg.ScanlineCycles * nescfg.TotalScanlines);
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}
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}
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internal void CheatCodeProcess()
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{
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//todo : ʵ<><CAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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}
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public void Dispose()
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{
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cpu?.Dispose();
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ppu?.Dispose();
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apu?.Dispose();
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pad?.Dispose();
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rom?.Dispose();
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}
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private void SaveSRAM()
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{
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int i;
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if (rom.IsNSF()) return;
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if (rom.IsSAVERAM()) return;
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for (i = 0; i < SAVERAM_SIZE; i++)
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{
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if (MMU.WRAM[i] != 0x00)
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break;
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}
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if (i < SAVERAM_SIZE)
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{
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var romName = rom.GetRomName();
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Debuger.Log($"Saving SAVERAM...[{romName}]");
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Supporter.SaveSRAMToFile(MMU.WRAM, romName);
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}
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}
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private void SaveDISK()
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{
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if (rom.GetMapperNo() != 20)
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return;
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int i = 0;
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Stream fp = null;
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DISKFILEHDR ifh;
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byte[] lpDisk = rom.GetPROM();
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byte[] lpWrite = rom.GetDISK();
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long DiskSize = 16 + 65500 * rom.GetDiskNo();
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ulong data;
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try
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{
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ifh = new DISKFILEHDR();
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ifh.ID = ASCIIEncoding.ASCII.GetBytes("VirtuaNES DI");
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ifh.BlockVersion = 0x0210;
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ifh.ProgID = rom.GetGameID();
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ifh.MakerID = (ushort)rom.GetMakerID();
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ifh.DiskNo = (ushort)rom.GetDiskNo();
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for (i = 16; i < DiskSize; i++)
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{
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if (lpWrite[i] > 0)
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ifh.DifferentSize++;
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}
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if (ifh.DifferentSize == 0)
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return;
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List<byte> contents = new List<byte>();
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contents.AddRange(ifh.ToBytes());
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for (i = 16; i < DiskSize; i++)
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{
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if (lpWrite[i] > 0)
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{
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data = (ulong)(i & 0x00FFFFFF);
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data |= ((ulong)lpDisk[i] & 0xFF) << 24;
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contents.AddRange(BitConverter.GetBytes(data));
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}
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}
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Supporter.SaveDISKToFile(contents.ToArray(), rom.GetRomName());
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}
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catch (Exception ex)
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{
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Debuger.LogError(ex.ToString());
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}
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}
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private void SaveTurboFile()
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{
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//todo : ʵ<><CAB5>
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}
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internal void Clock(int cycles)
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{
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Tape(cycles);
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Barcode(cycles);
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}
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private void Barcode(int cycles)
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{
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if (m_bBarcode)
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{
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m_BarcodeCycles += cycles;
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if (m_BarcodeCycles > 1000)
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{
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m_BarcodeCycles = 0;
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// <20><><EFBFBD>~<7E>H
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if (m_BarcodeData[m_BarcodePtr] != 0xFF)
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{
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m_BarcodeOut = m_BarcodeData[m_BarcodePtr++];
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}
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else
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{
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m_bBarcode = false;
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m_BarcodeOut = 0;
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Debuger.Log("Barcode data trasnfer complete!!");
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if (!(IsTapePlay() || IsTapeRec()))
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{
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cpu.SetClockProcess(false);
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}
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}
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}
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}
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}
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public bool IsTapeRec()
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{
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return m_bTapeRec;
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}
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public bool IsTapePlay()
|
||
{
|
||
return m_bTapePlay;
|
||
}
|
||
|
||
internal void Tape(int cycles)
|
||
{
|
||
//todo : ʵ<><CAB5>Tape (Ŀ<><C4BF><EFBFBD>Ǽ<EFBFBD>¼<EFBFBD><C2BC><EFBFBD>Ҳ<EFBFBD><D2B2><EFBFBD><EFBFBD><EFBFBD>Play,<2C><><EFBFBD>ȼ<EFBFBD><C8BC>ܵ<EFBFBD>)
|
||
}
|
||
|
||
internal byte Read(ushort addr)
|
||
{
|
||
switch (addr >> 13)
|
||
{
|
||
case 0x00: // $0000-$1FFF
|
||
return MMU.RAM[addr & 0x07FF];
|
||
case 0x01: // $2000-$3FFF
|
||
return ppu.Read((ushort)(addr & 0xE007));
|
||
case 0x02: // $4000-$5FFF
|
||
if (addr < 0x4100)
|
||
{
|
||
return ReadReg(addr);
|
||
}
|
||
else
|
||
{
|
||
return mapper.ReadLow(addr);
|
||
}
|
||
case 0x03: // $6000-$7FFF
|
||
return mapper.ReadLow(addr);
|
||
case 0x04: // $8000-$9FFF
|
||
case 0x05: // $A000-$BFFF
|
||
case 0x06: // $C000-$DFFF
|
||
case 0x07: // $E000-$FFFF
|
||
return MMU.CPU_MEM_BANK[addr >> 13].Span[addr & 0x1FFF];
|
||
}
|
||
|
||
return 0x00; // Warning<6E>\<5C>h
|
||
}
|
||
|
||
private byte ReadReg(ushort addr)
|
||
{
|
||
switch (addr & 0xFF)
|
||
{
|
||
case 0x00:
|
||
case 0x01:
|
||
case 0x02:
|
||
case 0x03:
|
||
case 0x04:
|
||
case 0x05:
|
||
case 0x06:
|
||
case 0x07:
|
||
case 0x08:
|
||
case 0x09:
|
||
case 0x0A:
|
||
case 0x0B:
|
||
case 0x0C:
|
||
case 0x0D:
|
||
case 0x0E:
|
||
case 0x0F:
|
||
case 0x10:
|
||
case 0x11:
|
||
case 0x12:
|
||
case 0x13:
|
||
return apu.Read(addr);
|
||
case 0x15:
|
||
return apu.Read(addr);
|
||
case 0x14:
|
||
return (byte)(addr & 0xFF);
|
||
case 0x16:
|
||
if (rom.IsVSUNISYSTEM())
|
||
{
|
||
return pad.Read(addr);
|
||
}
|
||
else
|
||
{
|
||
return (byte)(pad.Read(addr) | 0x40 | m_TapeOut);
|
||
}
|
||
case 0x17:
|
||
if (rom.IsVSUNISYSTEM())
|
||
{
|
||
return pad.Read(addr);
|
||
}
|
||
else
|
||
{
|
||
return (byte)(pad.Read(addr) | apu.Read(addr));
|
||
}
|
||
default:
|
||
return mapper.ExRead(addr);
|
||
}
|
||
}
|
||
|
||
internal byte Barcode2()
|
||
{
|
||
byte ret = 0x00;
|
||
|
||
if (!m_bBarcode2 || m_Barcode2seq < 0)
|
||
return ret;
|
||
|
||
switch (m_Barcode2seq)
|
||
{
|
||
case 0:
|
||
m_Barcode2seq++;
|
||
m_Barcode2ptr = 0;
|
||
ret = 0x04; // d3
|
||
break;
|
||
|
||
case 1:
|
||
m_Barcode2seq++;
|
||
m_Barcode2bit = m_Barcode2data[m_Barcode2ptr];
|
||
m_Barcode2cnt = 0;
|
||
ret = 0x04; // d3
|
||
break;
|
||
|
||
case 2:
|
||
ret = (byte)((m_Barcode2bit & 0x01) != 0 ? 0x00 : 0x04); // Bit rev.
|
||
m_Barcode2bit >>= 1;
|
||
if (++m_Barcode2cnt > 7)
|
||
{
|
||
m_Barcode2seq++;
|
||
}
|
||
break;
|
||
case 3:
|
||
if (++m_Barcode2ptr > 19)
|
||
{
|
||
m_bBarcode2 = false;
|
||
m_Barcode2seq = -1;
|
||
}
|
||
else
|
||
{
|
||
m_Barcode2seq = 1;
|
||
}
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
internal void Write(ushort addr, byte data)
|
||
{
|
||
switch (addr >> 13)
|
||
{
|
||
case 0x00: // $0000-$1FFF
|
||
MMU.RAM[addr & 0x07FF] = data;
|
||
break;
|
||
case 0x01: // $2000-$3FFF
|
||
if (!rom.IsNSF())
|
||
{
|
||
ppu.Write((ushort)(addr & 0xE007), data);
|
||
}
|
||
break;
|
||
case 0x02: // $4000-$5FFF
|
||
if (addr < 0x4100)
|
||
{
|
||
WriteReg(addr, data);
|
||
}
|
||
else
|
||
{
|
||
mapper.WriteLow(addr, data);
|
||
}
|
||
break;
|
||
case 0x03: // $6000-$7FFF
|
||
mapper.WriteLow(addr, data);
|
||
break;
|
||
case 0x04: // $8000-$9FFF
|
||
case 0x05: // $A000-$BFFF
|
||
case 0x06: // $C000-$DFFF
|
||
case 0x07: // $E000-$FFFF
|
||
mapper.Write(addr, data);
|
||
|
||
GenieCodeProcess();
|
||
break;
|
||
}
|
||
}
|
||
|
||
private void GenieCodeProcess()
|
||
{
|
||
ushort addr;
|
||
|
||
for (int i = 0; i < m_GenieCode.Count; i++)
|
||
{
|
||
addr = m_GenieCode[i].address;
|
||
if ((addr & 0x8000) != 0)
|
||
{
|
||
// 8character codes
|
||
if (MMU.CPU_MEM_BANK[addr >> 13].Span[addr & 0x1FFF] == m_GenieCode[i].cmp)
|
||
{
|
||
MMU.CPU_MEM_BANK[addr >> 13].Span[addr & 0x1FFF] = m_GenieCode[i].data;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
// 6character codes
|
||
addr |= 0x8000;
|
||
MMU.CPU_MEM_BANK[addr >> 13].Span[addr & 0x1FFF] = m_GenieCode[i].data;
|
||
}
|
||
}
|
||
}
|
||
|
||
private void WriteReg(ushort addr, byte data)
|
||
{
|
||
switch (addr & 0xFF)
|
||
{
|
||
case 0x00:
|
||
case 0x01:
|
||
case 0x02:
|
||
case 0x03:
|
||
case 0x04:
|
||
case 0x05:
|
||
case 0x06:
|
||
case 0x07:
|
||
case 0x08:
|
||
case 0x09:
|
||
case 0x0A:
|
||
case 0x0B:
|
||
case 0x0C:
|
||
case 0x0D:
|
||
case 0x0E:
|
||
case 0x0F:
|
||
case 0x10:
|
||
case 0x11:
|
||
case 0x12:
|
||
case 0x13:
|
||
case 0x15:
|
||
apu.Write(addr, data);
|
||
MMU.CPUREG[addr & 0xFF] = data;
|
||
break;
|
||
case 0x14:
|
||
ppu.DMA(data);
|
||
cpu.DMA(514); // DMA Pending cycle
|
||
MMU.CPUREG[addr & 0xFF] = data;
|
||
break;
|
||
case 0x16:
|
||
mapper.ExWrite(addr, data); // For VS-Unisystem
|
||
pad.Write(addr, data);
|
||
MMU.CPUREG[addr & 0xFF] = data;
|
||
m_TapeIn = data;
|
||
break;
|
||
case 0x17:
|
||
MMU.CPUREG[addr & 0xFF] = data;
|
||
pad.Write(addr, data);
|
||
apu.Write(addr, data);
|
||
break;
|
||
// VirtuaNES<45>ŗL<C597>|<7C>[<5B>g
|
||
case 0x18:
|
||
apu.Write(addr, data);
|
||
break;
|
||
default:
|
||
mapper.ExWrite(addr, data);
|
||
break;
|
||
}
|
||
}
|
||
|
||
internal bool GetVideoMode()
|
||
{
|
||
return bVideoMode;
|
||
}
|
||
|
||
internal void SetFrameIRQmode(bool bMode)
|
||
{
|
||
bFrameIRQ = bMode;
|
||
}
|
||
|
||
internal bool GetFrameIRQmode()
|
||
{
|
||
return bFrameIRQ;
|
||
}
|
||
}
|
||
}
|