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BizHawk/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/Gambatte.cs

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19 KiB
C#
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using BizHawk.Common.BufferExtensions;
using BizHawk.Emulation.Common;
using BizHawk.Common;
using Newtonsoft.Json;
namespace BizHawk.Emulation.Cores.Nintendo.Gameboy
{
/// <summary>
/// a gameboy/gameboy color emulator wrapped around native C++ libgambatte
/// </summary>
[CoreAttributes(
"Gambatte",
"",
isPorted: true,
isReleased: true,
portedVersion: "SVN 344",
portedUrl: "http://gambatte.sourceforge.net/"
)]
[ServiceNotApplicable(typeof(IDriveLight), typeof(IDriveLight))]
public partial class Gameboy : IEmulator, IVideoProvider, ISyncSoundProvider, ISaveRam, IStatable, IInputPollable,
IDebuggable, ISettable<Gameboy.GambatteSettings, Gameboy.GambatteSyncSettings>
{
/// <summary>
/// the nominal length of one frame
/// </summary>
private const uint TICKSINFRAME = 35112;
/// <summary>
/// number of ticks per second
/// </summary>
private const uint TICKSPERSECOND = 2097152;
/// <summary>
/// keep a copy of the input callback delegate so it doesn't get GCed
/// </summary>
LibGambatte.InputGetter InputCallback;
/// <summary>
/// whatever keys are currently depressed
/// </summary>
LibGambatte.Buttons CurrentButtons = 0;
#region RTC
/// <summary>
/// RTC time when emulation begins.
/// </summary>
uint zerotime = 0;
/// <summary>
/// if true, RTC will run off of real elapsed time
/// </summary>
bool real_rtc_time = false;
LibGambatte.RTCCallback TimeCallback;
static long GetUnixNow()
{
// because internally the RTC works off of relative time, we don't need to base
// this off of any particular canonical epoch.
return DateTime.UtcNow.Ticks / 10000000L - 60000000000L;
}
uint GetCurrentTime()
{
if (real_rtc_time)
{
return (uint)GetUnixNow();
}
else
{
ulong fn = (ulong)Frame;
// as we're exactly tracking cpu cycles, this can be pretty accurate
fn *= 4389;
fn /= 262144;
fn += zerotime;
return (uint)fn;
}
}
uint GetInitialTime()
{
if (real_rtc_time)
return (uint)GetUnixNow();
else
// setting the initial boot time to 0 will cause our zerotime
// to function as an initial offset, which is what we want
return 0;
}
#endregion
[CoreConstructor("GB", "GBC")]
public Gameboy(CoreComm comm, GameInfo game, byte[] file, object Settings, object SyncSettings, bool deterministic)
{
var ser = new BasicServiceProvider(this);
ser.Register<IDisassemblable>(new GBDisassembler());
ServiceProvider = ser;
Tracer = new TraceBuffer();
ser.Register<ITraceable>(Tracer);
InitMemoryCallbacks();
CoreComm = comm;
comm.VsyncNum = 262144;
comm.VsyncDen = 4389;
comm.RomStatusAnnotation = null;
comm.RomStatusDetails = null;
comm.NominalWidth = 160;
comm.NominalHeight = 144;
ThrowExceptionForBadRom(file);
BoardName = MapperName(file);
DeterministicEmulation = deterministic;
GambatteState = LibGambatte.gambatte_create();
if (GambatteState == IntPtr.Zero)
throw new InvalidOperationException("gambatte_create() returned null???");
try
{
this._syncSettings = (GambatteSyncSettings)SyncSettings ?? new GambatteSyncSettings();
// copy over non-loadflag syncsettings now; they won't take effect if changed later
zerotime = (uint)this._syncSettings.RTCInitialTime;
real_rtc_time = DeterministicEmulation ? false : this._syncSettings.RealTimeRTC;
LibGambatte.LoadFlags flags = 0;
if (this._syncSettings.ForceDMG)
flags |= LibGambatte.LoadFlags.FORCE_DMG;
if (this._syncSettings.GBACGB)
flags |= LibGambatte.LoadFlags.GBA_CGB;
if (this._syncSettings.MulticartCompat)
flags |= LibGambatte.LoadFlags.MULTICART_COMPAT;
if (LibGambatte.gambatte_load(GambatteState, file, (uint)file.Length, GetCurrentTime(), flags) != 0)
throw new InvalidOperationException("gambatte_load() returned non-zero (is this not a gb or gbc rom?)");
// set real default colors (before anyone mucks with them at all)
PutSettings((GambatteSettings)Settings ?? new GambatteSettings());
InitSound();
Frame = 0;
LagCount = 0;
IsLagFrame = false;
InputCallback = new LibGambatte.InputGetter(ControllerCallback);
LibGambatte.gambatte_setinputgetter(GambatteState, InputCallback);
InitMemoryDomains();
CoreComm.RomStatusDetails = string.Format("{0}\r\nSHA1:{1}\r\nMD5:{2}\r\n",
game.Name,
file.HashSHA1(),
file.HashMD5());
{
byte[] buff = new byte[32];
LibGambatte.gambatte_romtitle(GambatteState, buff);
string romname = System.Text.Encoding.ASCII.GetString(buff);
Console.WriteLine("Core reported rom name: {0}", romname);
}
TimeCallback = new LibGambatte.RTCCallback(GetCurrentTime);
LibGambatte.gambatte_setrtccallback(GambatteState, TimeCallback);
NewSaveCoreSetBuff();
}
catch
{
Dispose();
throw;
}
}
public IEmulatorServiceProvider ServiceProvider { get; private set; }
#region ALL SAVESTATEABLE STATE GOES HERE
/// <summary>
/// internal gambatte state
/// </summary>
internal IntPtr GambatteState = IntPtr.Zero;
public int Frame { get; set; }
public int LagCount { get; set; }
public bool IsLagFrame { get; private set; }
// all cycle counts are relative to a 2*1024*1024 mhz refclock
/// <summary>
/// total cycles actually executed
/// </summary>
private ulong _cycleCount = 0;
/// <summary>
/// number of extra cycles we overran in the last frame
/// </summary>
private uint frameOverflow = 0;
public ulong CycleCount { get { return _cycleCount; } }
#endregion
#region controller
public static readonly ControllerDefinition GbController = new ControllerDefinition
{
Name = "Gameboy Controller",
BoolButtons =
{
"Up", "Down", "Left", "Right", "Start", "Select", "B", "A", "Power"
}
};
public ControllerDefinition ControllerDefinition
{
get { return GbController; }
}
public IController Controller { get; set; }
LibGambatte.Buttons ControllerCallback()
{
InputCallbacks.Call();
IsLagFrame = false;
return CurrentButtons;
}
#endregion
/// <summary>
/// true if the emulator is currently emulating CGB
/// </summary>
/// <returns></returns>
public bool IsCGBMode()
{
return (LibGambatte.gambatte_iscgb(GambatteState));
}
private InputCallbackSystem _inputCallbacks = new InputCallbackSystem();
// low priority TODO: due to certain aspects of the core implementation,
// we don't smartly use the ActiveChanged event here.
public IInputCallbackSystem InputCallbacks { get { return _inputCallbacks; } }
/// <summary>
/// for use in dual core
/// </summary>
/// <param name="ics"></param>
public void ConnectInputCallbackSystem(InputCallbackSystem ics)
{
_inputCallbacks = ics;
}
internal void FrameAdvancePrep()
{
Frame++;
// update our local copy of the controller data
CurrentButtons = 0;
if (Controller["Up"])
CurrentButtons |= LibGambatte.Buttons.UP;
if (Controller["Down"])
CurrentButtons |= LibGambatte.Buttons.DOWN;
if (Controller["Left"])
CurrentButtons |= LibGambatte.Buttons.LEFT;
if (Controller["Right"])
CurrentButtons |= LibGambatte.Buttons.RIGHT;
if (Controller["A"])
CurrentButtons |= LibGambatte.Buttons.A;
if (Controller["B"])
CurrentButtons |= LibGambatte.Buttons.B;
if (Controller["Select"])
CurrentButtons |= LibGambatte.Buttons.SELECT;
if (Controller["Start"])
CurrentButtons |= LibGambatte.Buttons.START;
// the controller callback will set this to false if it actually gets called during the frame
IsLagFrame = true;
if (Controller["Power"])
LibGambatte.gambatte_reset(GambatteState, GetCurrentTime());
if (Tracer.Enabled)
tracecb = MakeTrace;
else
tracecb = null;
LibGambatte.gambatte_settracecallback(GambatteState, tracecb);
}
internal void FrameAdvancePost()
{
if (IsLagFrame)
LagCount++;
if (endofframecallback != null)
endofframecallback(LibGambatte.gambatte_cpuread(GambatteState, 0xff40));
}
public void FrameAdvance(bool render, bool rendersound)
{
FrameAdvancePrep();
if (_syncSettings.EqualLengthFrames)
{
while (true)
{
// target number of samples to emit: length of 1 frame minus whatever overflow
uint samplesEmitted = TICKSINFRAME - frameOverflow;
System.Diagnostics.Debug.Assert(samplesEmitted * 2 <= soundbuff.Length);
if (LibGambatte.gambatte_runfor(GambatteState, soundbuff, ref samplesEmitted) > 0)
LibGambatte.gambatte_blitto(GambatteState, VideoBuffer, 160);
// account for actual number of samples emitted
_cycleCount += (ulong)samplesEmitted;
frameOverflow += samplesEmitted;
if (rendersound && !Muted)
{
ProcessSound((int)samplesEmitted);
}
if (frameOverflow >= TICKSINFRAME)
{
frameOverflow -= TICKSINFRAME;
break;
}
}
}
else
{
// target number of samples to emit: always 59.7fps
// runfor() always ends after creating a video frame, so sync-up is guaranteed
// when the display has been off, some frames can be markedly shorter than expected
uint samplesEmitted = TICKSINFRAME;
if (LibGambatte.gambatte_runfor(GambatteState, soundbuff, ref samplesEmitted) > 0)
LibGambatte.gambatte_blitto(GambatteState, VideoBuffer, 160);
_cycleCount += (ulong)samplesEmitted;
frameOverflow = 0;
if (rendersound && !Muted)
{
ProcessSound((int)samplesEmitted);
}
}
if (rendersound && !Muted)
ProcessSoundEnd();
FrameAdvancePost();
}
static string MapperName(byte[] romdata)
{
switch (romdata[0x147])
{
case 0x00: return "Plain ROM"; // = PLAIN; break;
case 0x01: return "MBC1 ROM"; // = MBC1; break;
case 0x02: return "MBC1 ROM+RAM"; // = MBC1; break;
case 0x03: return "MBC1 ROM+RAM+BATTERY"; // = MBC1; break;
case 0x05: return "MBC2 ROM"; // = MBC2; break;
case 0x06: return "MBC2 ROM+BATTERY"; // = MBC2; break;
case 0x08: return "Plain ROM+RAM"; // = PLAIN; break;
case 0x09: return "Plain ROM+RAM+BATTERY"; // = PLAIN; break;
case 0x0F: return "MBC3 ROM+TIMER+BATTERY"; // = MBC3; break;
case 0x10: return "MBC3 ROM+TIMER+RAM+BATTERY"; // = MBC3; break;
case 0x11: return "MBC3 ROM"; // = MBC3; break;
case 0x12: return "MBC3 ROM+RAM"; // = MBC3; break;
case 0x13: return "MBC3 ROM+RAM+BATTERY"; // = MBC3; break;
case 0x19: return "MBC5 ROM"; // = MBC5; break;
case 0x1A: return "MBC5 ROM+RAM"; // = MBC5; break;
case 0x1B: return "MBC5 ROM+RAM+BATTERY"; // = MBC5; break;
case 0x1C: return "MBC5 ROM+RUMBLE"; // = MBC5; break;
case 0x1D: return "MBC5 ROM+RUMBLE+RAM"; // = MBC5; break;
case 0x1E: return "MBC5 ROM+RUMBLE+RAM+BATTERY"; // = MBC5; break;
case 0xFF: return "HuC1 ROM+RAM+BATTERY"; // = HUC1; break;
default: return "UNKNOWN";
}
}
/// <summary>
/// throw exception with intelligible message on some kinds of bad rom
/// </summary>
/// <param name="romdata"></param>
static void ThrowExceptionForBadRom(byte[] romdata)
{
if (romdata.Length < 0x148)
throw new ArgumentException("ROM is far too small to be a valid GB\\GBC rom!");
switch (romdata[0x147])
{
case 0x00: break;
case 0x01: break;
case 0x02: break;
case 0x03: break;
case 0x05: break;
case 0x06: break;
case 0x08: break;
case 0x09: break;
case 0x0b: throw new UnsupportedGameException("\"MM01\" Mapper not supported!");
case 0x0c: throw new UnsupportedGameException("\"MM01\" Mapper not supported!");
case 0x0d: throw new UnsupportedGameException("\"MM01\" Mapper not supported!");
case 0x0f: break;
case 0x10: break;
case 0x11: break;
case 0x12: break;
case 0x13: break;
case 0x15: throw new UnsupportedGameException("\"MBC4\" Mapper not supported!");
case 0x16: throw new UnsupportedGameException("\"MBC4\" Mapper not supported!");
case 0x17: throw new UnsupportedGameException("\"MBC4\" Mapper not supported!");
case 0x19: break;
case 0x1a: break;
case 0x1b: break;
case 0x1c: break; // rumble
case 0x1d: break; // rumble
case 0x1e: break; // rumble
case 0x20: throw new UnsupportedGameException("\"MBC6\" Mapper not supported!");
case 0x22: throw new UnsupportedGameException("\"MBC7\" Mapper not supported!");
case 0xfc: throw new UnsupportedGameException("\"Pocket Camera\" Mapper not supported!");
case 0xfd: throw new UnsupportedGameException("\"Bandai TAMA5\" Mapper not supported!");
case 0xfe: throw new UnsupportedGameException("\"HuC3\" Mapper not supported!");
case 0xff: break;
default: throw new UnsupportedGameException(string.Format("Unknown mapper: {0:x2}", romdata[0x147]));
}
return;
}
public string SystemId { get { return "GB"; } }
public string BoardName { get; private set; }
public bool DeterministicEmulation { get; private set; }
public void ResetCounters()
{
Frame = 0;
LagCount = 0;
IsLagFrame = false;
// reset frame counters is meant to "re-zero" emulation time wherever it was
// so these should be reset as well
_cycleCount = 0;
frameOverflow = 0;
}
public CoreComm CoreComm { get; set; }
#region ppudebug
public bool GetGPUMemoryAreas(out IntPtr vram, out IntPtr bgpal, out IntPtr sppal, out IntPtr oam)
{
IntPtr _vram = IntPtr.Zero;
IntPtr _bgpal = IntPtr.Zero;
IntPtr _sppal = IntPtr.Zero;
IntPtr _oam = IntPtr.Zero;
int unused = 0;
if (!LibGambatte.gambatte_getmemoryarea(GambatteState, LibGambatte.MemoryAreas.vram, ref _vram, ref unused)
|| !LibGambatte.gambatte_getmemoryarea(GambatteState, LibGambatte.MemoryAreas.bgpal, ref _bgpal, ref unused)
|| !LibGambatte.gambatte_getmemoryarea(GambatteState, LibGambatte.MemoryAreas.sppal, ref _sppal, ref unused)
|| !LibGambatte.gambatte_getmemoryarea(GambatteState, LibGambatte.MemoryAreas.oam, ref _oam, ref unused))
{
vram = IntPtr.Zero;
bgpal = IntPtr.Zero;
sppal = IntPtr.Zero;
oam = IntPtr.Zero;
return false;
}
vram = _vram;
bgpal = _bgpal;
sppal = _sppal;
oam = _oam;
return true;
}
/// <summary>
///
/// </summary>
/// <param name="lcdc">current value of register $ff40 (LCDC)</param>
public delegate void ScanlineCallback(int lcdc);
/// <summary>
/// set up callback
/// </summary>
/// <param name="callback"></param>
/// <param name="line">scanline. -1 = end of frame, -2 = RIGHT NOW</param>
public void SetScanlineCallback(ScanlineCallback callback, int line)
{
if (GambatteState == IntPtr.Zero)
// not sure how this is being reached. tried the debugger...
return;
endofframecallback = null;
if (callback == null || line == -1 || line == -2)
{
scanlinecb = null;
LibGambatte.gambatte_setscanlinecallback(GambatteState, null, 0);
if (line == -1)
endofframecallback = callback;
else if (line == -2)
callback(LibGambatte.gambatte_cpuread(GambatteState, 0xff40));
}
else if (line >= 0 && line <= 153)
{
scanlinecb = delegate()
{
callback(LibGambatte.gambatte_cpuread(GambatteState, 0xff40));
};
LibGambatte.gambatte_setscanlinecallback(GambatteState, scanlinecb, line);
}
else
{
throw new ArgumentOutOfRangeException("line", "line must be in [0, 153]");
}
}
LibGambatte.ScanlineCallback scanlinecb;
ScanlineCallback endofframecallback;
#endregion
public void Dispose()
{
if (GambatteState != IntPtr.Zero)
{
LibGambatte.gambatte_destroy(GambatteState);
GambatteState = IntPtr.Zero;
}
DisposeSound();
}
#region palette
/// <summary>
/// update gambatte core's internal colors
/// </summary>
public void ChangeDMGColors(int[] colors)
{
for (int i = 0; i < 12; i++)
LibGambatte.gambatte_setdmgpalettecolor(GambatteState, (LibGambatte.PalType)(i / 4), (uint)i % 4, (uint)colors[i]);
}
public void SetCGBColors(GBColors.ColorType type)
{
int[] lut = GBColors.GetLut(type);
LibGambatte.gambatte_setcgbpalette(GambatteState, lut);
}
#endregion
#region ISoundProvider
public ISoundProvider SoundProvider { get { return null; } }
public ISyncSoundProvider SyncSoundProvider { get { return this; } }
public bool StartAsyncSound() { return false; }
public void EndAsyncSound() { }
/// <summary>
/// sample pairs before resampling
/// </summary>
short[] soundbuff = new short[(35112 + 2064) * 2];
int soundoutbuffcontains = 0;
short[] soundoutbuff = new short[2048];
int latchL = 0;
int latchR = 0;
BlipBuffer blipL, blipR;
uint blipAccumulate;
private void ProcessSound(int nsamp)
{
for (uint i = 0; i < nsamp; i++)
{
int curr = soundbuff[i * 2];
if (curr != latchL)
{
int diff = latchL - curr;
latchL = curr;
blipL.AddDelta(blipAccumulate, diff);
}
curr = soundbuff[i * 2 + 1];
if (curr != latchR)
{
int diff = latchR - curr;
latchR = curr;
blipR.AddDelta(blipAccumulate, diff);
}
blipAccumulate++;
}
}
private void ProcessSoundEnd()
{
blipL.EndFrame(blipAccumulate);
blipR.EndFrame(blipAccumulate);
blipAccumulate = 0;
soundoutbuffcontains = blipL.SamplesAvailable();
if (soundoutbuffcontains != blipR.SamplesAvailable())
throw new InvalidOperationException("Audio processing error");
blipL.ReadSamplesLeft(soundoutbuff, soundoutbuffcontains);
blipR.ReadSamplesRight(soundoutbuff, soundoutbuffcontains);
}
void InitSound()
{
blipL = new BlipBuffer(1024);
blipL.SetRates(TICKSPERSECOND, 44100);
blipR = new BlipBuffer(1024);
blipR.SetRates(TICKSPERSECOND, 44100);
}
void DisposeSound()
{
if (blipL != null)
{
blipL.Dispose();
blipL = null;
}
if (blipR != null)
{
blipR.Dispose();
blipR = null;
}
}
public void DiscardSamples()
{
soundoutbuffcontains = 0;
}
public void GetSamples(out short[] samples, out int nsamp)
{
samples = soundoutbuff;
nsamp = soundoutbuffcontains;
}
public bool Muted { get { return _settings.Muted; } }
#endregion
}
}
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