354 lines
11 KiB
C#
354 lines
11 KiB
C#
using System;
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using System.Collections.Generic;
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using BizHawk.Common.BufferExtensions;
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using BizHawk.Emulation.Common;
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using BizHawk.Emulation.Cores.Components;
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using BizHawk.Emulation.Cores.Components.H6280;
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using BizHawk.Emulation.DiscSystem;
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namespace BizHawk.Emulation.Cores.PCEngine
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{
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public enum NecSystemType { TurboGrafx, TurboCD, SuperGrafx }
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[CoreAttributes(
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"PCEHawk",
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"Vecna",
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isPorted: false,
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isReleased: true)]
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public sealed partial class PCEngine : IEmulator, ISaveRam, IStatable, IInputPollable,
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IDebuggable, ISettable<PCEngine.PCESettings, PCEngine.PCESyncSettings>, IDriveLight, ICodeDataLogger
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{
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[CoreConstructor("PCE", "SGX")]
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public PCEngine(CoreComm comm, GameInfo game, byte[] rom, object Settings, object syncSettings)
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{
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MemoryCallbacks = new MemoryCallbackSystem();
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CoreComm = comm;
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switch (game.System)
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{
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default:
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case "PCE":
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SystemId = "PCE";
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Type = NecSystemType.TurboGrafx;
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break;
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case "SGX":
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SystemId = "SGX";
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Type = NecSystemType.SuperGrafx;
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break;
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}
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this.Settings = (PCESettings)Settings ?? new PCESettings();
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_syncSettings = (PCESyncSettings)syncSettings ?? new PCESyncSettings();
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Init(game, rom);
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SetControllerButtons();
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}
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public PCEngine(CoreComm comm, GameInfo game, Disc disc, object Settings, object syncSettings)
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{
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CoreComm = comm;
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MemoryCallbacks = new MemoryCallbackSystem();
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DriveLightEnabled = true;
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SystemId = "PCECD";
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Type = NecSystemType.TurboCD;
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this.disc = disc;
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this.Settings = (PCESettings)Settings ?? new PCESettings();
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_syncSettings = (PCESyncSettings)syncSettings ?? new PCESyncSettings();
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GameInfo biosInfo;
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byte[] rom = CoreComm.CoreFileProvider.GetFirmwareWithGameInfo("PCECD", "Bios", true, out biosInfo,
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"PCE-CD System Card not found. Please check the BIOS settings in Config->Firmwares.");
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if (biosInfo.Status == RomStatus.BadDump)
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{
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CoreComm.ShowMessage(
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"The PCE-CD System Card you have selected is known to be a bad dump. This may cause problems playing PCE-CD games.\n\n"
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+ "It is recommended that you find a good dump of the system card. Sorry to be the bearer of bad news!");
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}
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else if (biosInfo.NotInDatabase)
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{
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CoreComm.ShowMessage(
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"The PCE-CD System Card you have selected is not recognized in our database. That might mean it's a bad dump, or isn't the correct rom.");
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}
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else if (biosInfo["BIOS"] == false)
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{
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// zeromus says: someone please write a note about how this could possibly happen.
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// it seems like this is a relic of using gameDB for storing whether something is a bios? firmwareDB should be handling it now.
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CoreComm.ShowMessage(
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"The PCE-CD System Card you have selected is not a BIOS image. You may have selected the wrong rom. FYI-Please report this to developers, I don't think this error message should happen.");
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}
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if (biosInfo["SuperSysCard"])
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{
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game.AddOption("SuperSysCard");
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}
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if (game["NeedSuperSysCard"] && game["SuperSysCard"] == false)
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{
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CoreComm.ShowMessage(
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"This game requires a version 3.0 System card and won't run with the system card you've selected. Try selecting a 3.0 System Card in the firmware configuration.");
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throw new Exception();
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}
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game.FirmwareHash = rom.HashSHA1();
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Init(game, rom);
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// the default RomStatusDetails don't do anything with Disc
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CoreComm.RomStatusDetails = string.Format("{0}\r\nDisk partial hash:{1}", game.Name, new DiscSystem.DiscHasher(disc).OldHash());
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SetControllerButtons();
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}
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// ROM
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private byte[] RomData;
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private int RomLength;
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private Disc disc;
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// Machine
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public NecSystemType Type;
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internal HuC6280 Cpu;
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public VDC VDC1, VDC2;
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public VCE VCE;
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private VPC VPC;
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private ScsiCDBus SCSI;
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private ADPCM ADPCM;
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private IController _controller;
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public HuC6280PSG PSG;
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internal CDAudio CDAudio;
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private SoundMixer SoundMixer;
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private bool TurboGrafx => Type == NecSystemType.TurboGrafx;
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private bool SuperGrafx => Type == NecSystemType.SuperGrafx;
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private bool TurboCD => Type == NecSystemType.TurboCD;
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// BRAM
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private bool BramEnabled = false;
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private bool BramLocked = true;
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private byte[] BRAM;
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// Memory system
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private byte[] Ram; // PCE= 8K base ram, SGX= 64k base ram
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private byte[] CDRam; // TurboCD extra 64k of ram
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private byte[] SuperRam; // Super System Card 192K of additional RAM
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private byte[] ArcadeRam; // Arcade Card 2048K of additional RAM
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private bool ForceSpriteLimit;
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// 21,477,270 Machine clocks / sec
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// 7,159,090 Cpu cycles / sec
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private ITraceable Tracer { get; set; }
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private void Init(GameInfo game, byte[] rom)
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{
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Cpu = new HuC6280(MemoryCallbacks);
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VCE = new VCE();
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VDC1 = new VDC(this, Cpu, VCE);
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PSG = new HuC6280PSG();
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SCSI = new ScsiCDBus(this, disc);
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Cpu.Logger = s => Tracer.Put(s);
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if (TurboGrafx)
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{
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Ram = new byte[0x2000];
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Cpu.ReadMemory21 = ReadMemory;
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Cpu.WriteMemory21 = WriteMemory;
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Cpu.WriteVDC = VDC1.WriteVDC;
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_soundProvider = new FakeSyncSound(PSG, 735);
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CDAudio = new CDAudio(null, 0);
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}
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else if (SuperGrafx)
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{
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VDC2 = new VDC(this, Cpu, VCE);
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VPC = new VPC(this, VDC1, VDC2, VCE, Cpu);
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Ram = new byte[0x8000];
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Cpu.ReadMemory21 = ReadMemorySGX;
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Cpu.WriteMemory21 = WriteMemorySGX;
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Cpu.WriteVDC = VDC1.WriteVDC;
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_soundProvider = new FakeSyncSound(PSG, 735);
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CDAudio = new CDAudio(null, 0);
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}
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else if (TurboCD)
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{
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Ram = new byte[0x2000];
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CDRam = new byte[0x10000];
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ADPCM = new ADPCM(this, SCSI);
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Cpu.ReadMemory21 = ReadMemoryCD;
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Cpu.WriteMemory21 = WriteMemoryCD;
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Cpu.WriteVDC = VDC1.WriteVDC;
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CDAudio = new CDAudio(disc);
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SetCDAudioCallback();
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PSG.MaxVolume = short.MaxValue * 3 / 4;
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SoundMixer = new SoundMixer(PSG, CDAudio, ADPCM);
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_soundProvider = new FakeSyncSound(SoundMixer, 735);
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Cpu.ThinkAction = (cycles) => { SCSI.Think(); ADPCM.Think(cycles); };
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}
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if (rom.Length == 0x60000)
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{
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// 384k roms require special loading code. Why ;_;
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// In memory, 384k roms look like [1st 256k][Then full 384k]
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RomData = new byte[0xA0000];
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var origRom = rom;
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for (int i = 0; i < 0x40000; i++)
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RomData[i] = origRom[i];
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for (int i = 0; i < 0x60000; i++)
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RomData[i + 0x40000] = origRom[i];
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RomLength = RomData.Length;
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}
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else if (rom.Length > 1024 * 1024)
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{
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// If the rom is bigger than 1 megabyte, switch to Street Fighter 2 mapper
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Cpu.ReadMemory21 = ReadMemorySF2;
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Cpu.WriteMemory21 = WriteMemorySF2;
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RomData = rom;
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RomLength = RomData.Length;
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// user request: current value of the SF2MapperLatch on the tracelogger
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Cpu.Logger = (s) => Tracer.Put(new TraceInfo
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{
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Disassembly = $"{SF2MapperLatch:X1}:{s}",
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RegisterInfo = string.Empty
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});
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}
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else
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{
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// normal rom.
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RomData = rom;
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RomLength = RomData.Length;
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}
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if (game["BRAM"] || Type == NecSystemType.TurboCD)
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{
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BramEnabled = true;
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BRAM = new byte[2048];
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// pre-format BRAM. damn are we helpful.
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BRAM[0] = 0x48; BRAM[1] = 0x55; BRAM[2] = 0x42; BRAM[3] = 0x4D;
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BRAM[4] = 0x00; BRAM[5] = 0x88; BRAM[6] = 0x10; BRAM[7] = 0x80;
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}
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if (game["SuperSysCard"])
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{
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SuperRam = new byte[0x30000];
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}
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if (game["ArcadeCard"])
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{
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ArcadeRam = new byte[0x200000];
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ArcadeCard = true;
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ArcadeCardRewindHack = Settings.ArcadeCardRewindHack;
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for (int i = 0; i < 4; i++)
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{
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ArcadePage[i] = new ArcadeCardPage();
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}
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}
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if (game["PopulousSRAM"])
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{
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PopulousRAM = new byte[0x8000];
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Cpu.ReadMemory21 = ReadMemoryPopulous;
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Cpu.WriteMemory21 = WriteMemoryPopulous;
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}
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// the gamedb can force sprite limit on, ignoring settings
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if (game["ForceSpriteLimit"] || game.NotInDatabase)
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{
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ForceSpriteLimit = true;
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}
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if (game["CdVol"])
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{
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CDAudio.MaxVolume = int.Parse(game.OptionValue("CdVol"));
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}
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if (game["PsgVol"])
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{
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PSG.MaxVolume = int.Parse(game.OptionValue("PsgVol"));
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}
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if (game["AdpcmVol"])
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{
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ADPCM.MaxVolume = int.Parse(game.OptionValue("AdpcmVol"));
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}
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// the gamedb can also force equalizevolumes on
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if (TurboCD && (Settings.EqualizeVolume || game["EqualizeVolumes"] || game.NotInDatabase))
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{
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SoundMixer.EqualizeVolumes();
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}
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// Ok, yes, HBlankPeriod's only purpose is game-specific hax.
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// 1) At least they're not coded directly into the emulator, but instead data-driven.
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// 2) The games which have custom HBlankPeriods work without it, the override only
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// serves to clean up minor gfx anomalies.
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// 3) There's no point in haxing the timing with incorrect values in an attempt to avoid this.
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// The proper fix is cycle-accurate/bus-accurate timing. That isn't coming to the C#
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// version of this core. Let's just acknolwedge that the timing is imperfect and fix
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// it in the least intrusive and most honest way we can.
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if (game["HBlankPeriod"])
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{
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VDC1.HBlankCycles = game.GetIntValue("HBlankPeriod");
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}
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// This is also a hack. Proper multi-res/TV emulation will be a native-code core feature.
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if (game["MultiResHack"])
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{
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VDC1.MultiResHack = game.GetIntValue("MultiResHack");
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}
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Cpu.ResetPC();
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Tracer = new TraceBuffer { Header = Cpu.TraceHeader };
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var ser = new BasicServiceProvider(this);
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ServiceProvider = ser;
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ser.Register<ITraceable>(Tracer);
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ser.Register<IDisassemblable>(Cpu);
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ser.Register<IVideoProvider>((IVideoProvider)VPC ?? VDC1);
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ser.Register<ISoundProvider>(_soundProvider);
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SetupMemoryDomains();
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}
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private int _frame;
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private static Dictionary<string, int> SizesFromHuMap(IEnumerable<HuC6280.MemMapping> mm)
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{
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Dictionary<string, int> sizes = new Dictionary<string, int>();
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foreach (var m in mm)
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{
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if (!sizes.ContainsKey(m.Name) || m.MaxOffs >= sizes[m.Name])
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{
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sizes[m.Name] = m.MaxOffs;
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}
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}
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var keys = new List<string>(sizes.Keys);
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foreach (var key in keys)
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{
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// becase we were looking at offsets, and each bank is 8192 big, we need to add that size
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sizes[key] += 8192;
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}
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return sizes;
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}
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private void CheckSpriteLimit()
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{
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bool spriteLimit = ForceSpriteLimit | Settings.SpriteLimit;
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VDC1.PerformSpriteLimit = spriteLimit;
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if (VDC2 != null)
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{
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VDC2.PerformSpriteLimit = spriteLimit;
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}
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}
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private ISoundProvider _soundProvider;
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private string Region { get; set; }
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}
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}
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