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BizHawk
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nuke sameboy (#2934)

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CasualPokePlayer 2021-10-18 18:38:23 -07:00 committed by GitHub
parent 09ccf0dbe8
commit 9a87a0f586
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62 changed files with 3 additions and 13528 deletions
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BIN
Assets/dll/sameboy.wbx.gz
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2
README.md
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@ -313,7 +313,7 @@ Sega Genesis | **Genplus-gx**
Sega Master System | **SMSHawk**
Sega Saturn | **Saturnus**
SNES | **BSNES**, Faust, Snes9x
Super Game Boy | **BSNES**, **Gambatte**, **SameBoy**
Super Game Boy | **BSNES**, **Gambatte**
TI-83 | **TI83Hawk**
TurboGrafx | HyperNyma, **PCEHawk**, **TurboNyma**
Uzebox | **Uzem**

4
src/BizHawk.Client.Common/config/Config.cs
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@ -24,7 +24,7 @@ namespace BizHawk.Client.Common
(new[] { "SNES" },
new[] { CoreNames.Faust, CoreNames.Snes9X, CoreNames.Bsnes, CoreNames.Bsnes115 }),
(new[] { "SGB" },
new[] { CoreNames.Gambatte, CoreNames.SameBoy, CoreNames.Bsnes, CoreNames.Bsnes115}),
new[] { CoreNames.Gambatte, CoreNames.Bsnes, CoreNames.Bsnes115}),
(new[] { "GB", "GBC" },
new[] { CoreNames.Gambatte, CoreNames.GbHawk, CoreNames.SubGbHawk }),
(new[] { "DGB" },
@ -322,7 +322,7 @@ namespace BizHawk.Client.Common
["GB"] = CoreNames.Gambatte,
["GBC"] = CoreNames.Gambatte,
["DGB"] = CoreNames.DualGambatte,
["SGB"] = CoreNames.SameBoy,
["SGB"] = CoreNames.Gambatte,
["PCE"] = CoreNames.TurboNyma,
["PCECD"] = CoreNames.TurboNyma,
["SGX"] = CoreNames.TurboNyma

4
src/BizHawk.Client.EmuHawk/MainForm.Events.cs
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@ -1574,10 +1574,6 @@ namespace BizHawk.Client.EmuHawk
{
GBPrefs.DoGBPrefsDialog(this, Config, Game, MovieSession, gb);
}
else // SameBoy
{
GenericCoreConfig.DoDialog(this, "Gameboy Settings");
}
}
private void GbGpuViewerMenuItem_Click(object sender, EventArgs e)

1
src/BizHawk.Client.EmuHawk/MainForm.cs
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@ -1997,7 +1997,6 @@ namespace BizHawk.Client.EmuHawk
break;
case "GB":
case "GBC":
case "SGB" when Emulator is Sameboy:
case "SGB" when Emulator is Gameboy:
GBSubMenu.Visible = true;
break;

55
src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/LibSameboy.cs
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@ -1,55 +0,0 @@
using BizHawk.BizInvoke;
using BizHawk.Emulation.Cores.Waterbox;
using System;
using System.Runtime.InteropServices;
namespace BizHawk.Emulation.Cores.Consoles.Nintendo.Gameboy
{
public abstract class LibSameboy : LibWaterboxCore
{
[Flags]
public enum Buttons : uint
{
A = 0x01,
B = 0x02,
SELECT = 0x04,
START = 0x08,
RIGHT = 0x10,
LEFT = 0x20,
UP = 0x40,
DOWN = 0x80
}
[StructLayout(LayoutKind.Sequential)]
public new class FrameInfo : LibWaterboxCore.FrameInfo
{
public long Time;
public Buttons Keys;
}
[BizImport(CC)]
public abstract bool Init(bool cgb, byte[] spc, int spclen);
[BizImport(CC)]
public abstract void GetGpuMemory(IntPtr[] ptrs);
[BizImport(CC)]
public abstract void SetScanlineCallback(ScanlineCallback callback, int ly);
[BizImport(CC)]
public abstract byte GetIoReg(byte port);
[BizImport(CC)]
public abstract void PutSaveRam();
[BizImport(CC)]
public abstract void GetSaveRam();
[BizImport(CC)]
public abstract bool HasSaveRam();
[BizImport(CC)]
public abstract void SetPrinterCallback(PrinterCallback callback);
}
}

410
src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/Sameboy.cs
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@ -1,410 +0,0 @@
using BizHawk.Common;
using BizHawk.Emulation.Common;
using BizHawk.Emulation.Cores.Properties;
using BizHawk.Emulation.Cores.Waterbox;
using System;
using System.ComponentModel;
using System.IO;
using System.Linq;
namespace BizHawk.Emulation.Cores.Consoles.Nintendo.Gameboy
{
[PortedCore(CoreNames.SameBoy, "LIJI32", "efc11783c7fb6da66e1dd084e41ba6a85c0bd17e", "https://sameboy.github.io/")]
public class Sameboy : WaterboxCore,
IGameboyCommon, ISaveRam,
ISettable<Sameboy.Settings, Sameboy.SyncSettings>
{
/// <summary>
/// the nominal length of one frame
/// </summary>
private const int TICKSPERFRAME = 35112;
/// <summary>
/// number of ticks per second (GB, CGB)
/// </summary>
private const int TICKSPERSECOND = 2097152;
/// <summary>
/// number of ticks per second (SGB)
/// </summary>
private const int TICKSPERSECOND_SGB = 2147727;
private readonly LibSameboy _core;
private readonly bool _cgb;
private readonly bool _sgb;
private readonly IntPtr[] _cachedGpuPointers = new IntPtr[4];
[CoreConstructor("SGB")]
public Sameboy(byte[] rom, CoreComm comm, Settings settings, SyncSettings syncSettings, bool deterministic)
: this(rom, comm, true, settings, syncSettings, deterministic)
{ }
[CoreConstructor("GB")]
[CoreConstructor("GBC")]
public Sameboy(CoreComm comm, byte[] rom, Settings settings, SyncSettings syncSettings, bool deterministic)
: this(rom, comm, false, settings, syncSettings, deterministic)
{ }
public Sameboy(byte[] rom, CoreComm comm, bool sgb, Settings settings, SyncSettings syncSettings, bool deterministic)
: base(comm, new Configuration
{
DefaultWidth = sgb && (settings == null || settings.ShowSgbBorder) ? 256 : 160,
DefaultHeight = sgb && (settings == null || settings.ShowSgbBorder) ? 224 : 144,
MaxWidth = sgb ? 256 : 160,
MaxHeight = sgb ? 224 : 144,
MaxSamples = 1024,
DefaultFpsNumerator = sgb ? TICKSPERSECOND_SGB : TICKSPERSECOND,
DefaultFpsDenominator = TICKSPERFRAME,
SystemId = sgb ? "SGB" : "GB"
})
{
_corePrinterCallback = PrinterCallbackRelay;
_coreScanlineCallback = ScanlineCallbackRelay;
_core = PreInit<LibSameboy>(new WaterboxOptions
{
Filename = "sameboy.wbx",
SbrkHeapSizeKB = 192,
InvisibleHeapSizeKB = 12,
SealedHeapSizeKB = 9 * 1024,
PlainHeapSizeKB = 4,
MmapHeapSizeKB = 1024,
SkipCoreConsistencyCheck = comm.CorePreferences.HasFlag(CoreComm.CorePreferencesFlags.WaterboxCoreConsistencyCheck),
SkipMemoryConsistencyCheck = comm.CorePreferences.HasFlag(CoreComm.CorePreferencesFlags.WaterboxMemoryConsistencyCheck),
}, new Delegate[] { _corePrinterCallback, _coreScanlineCallback });
_cgb = (rom[0x143] & 0xc0) == 0xc0 && !sgb;
_sgb = sgb;
Console.WriteLine("Automaticly detected CGB to " + _cgb);
_syncSettings = syncSettings ?? new SyncSettings();
_settings = settings ?? new Settings();
var bios = _syncSettings.UseRealBIOS && !sgb
? comm.CoreFileProvider.GetFirmwareOrThrow(new(_cgb ? "GBC" : "GB", "World"))
: Util.DecompressGzipFile(new MemoryStream(_cgb ? Resources.SameboyCgbBoot.Value : Resources.SameboyDmgBoot.Value));
var spc = sgb
? Util.DecompressGzipFile(new MemoryStream(Resources.SgbCartPresent_SPC.Value))
: null;
_exe.AddReadonlyFile(rom, "game.rom");
_exe.AddReadonlyFile(bios, "boot.rom");
if (!_core.Init(_cgb, spc, spc?.Length ?? 0))
{
throw new InvalidOperationException("Core rejected the rom!");
}
_exe.RemoveReadonlyFile("game.rom");
_exe.RemoveReadonlyFile("boot.rom");
_core.GetGpuMemory(_cachedGpuPointers);
PostInit();
DeterministicEmulation = deterministic || !_syncSettings.UseRealTime;
InitializeRtc(_syncSettings.InitialTime);
}
private static readonly ControllerDefinition _gbDefinition;
private static readonly ControllerDefinition _sgbDefinition;
public override ControllerDefinition ControllerDefinition => _sgb ? _sgbDefinition : _gbDefinition;
private static ControllerDefinition CreateControllerDefinition(int p)
{
var ret = new ControllerDefinition { Name = "Gameboy Controller" };
for (int i = 0; i < p; i++)
{
ret.BoolButtons.AddRange(
new[] { "Up", "Down", "Left", "Right", "A", "B", "Select", "Start" }
.Select(s => $"P{i + 1} {s}"));
}
return ret;
}
static Sameboy()
{
_gbDefinition = CreateControllerDefinition(1);
_sgbDefinition = CreateControllerDefinition(4);
}
private LibSameboy.Buttons GetButtons(IController c)
{
LibSameboy.Buttons b = 0;
for (int i = _sgb ? 4 : 1; i > 0; i--)
{
if (c.IsPressed($"P{i} Up"))
b |= LibSameboy.Buttons.UP;
if (c.IsPressed($"P{i} Down"))
b |= LibSameboy.Buttons.DOWN;
if (c.IsPressed($"P{i} Left"))
b |= LibSameboy.Buttons.LEFT;
if (c.IsPressed($"P{i} Right"))
b |= LibSameboy.Buttons.RIGHT;
if (c.IsPressed($"P{i} A"))
b |= LibSameboy.Buttons.A;
if (c.IsPressed($"P{i} B"))
b |= LibSameboy.Buttons.B;
if (c.IsPressed($"P{i} Select"))
b |= LibSameboy.Buttons.SELECT;
if (c.IsPressed($"P{i} Start"))
b |= LibSameboy.Buttons.START;
if (_sgb)
{
// The SGB SNES side code enforces U+D/L+R prohibitions
if (((uint)b & 0x30) == 0x30)
b &= unchecked((LibSameboy.Buttons)~0x30);
if (((uint)b & 0xc0) == 0xc0)
b &= unchecked((LibSameboy.Buttons)~0xc0);
}
if (i != 1)
{
b = (LibSameboy.Buttons)((uint)b << 8);
}
}
return b;
}
public new bool SaveRamModified => _core.HasSaveRam();
public new byte[] CloneSaveRam()
{
_exe.AddTransientFile(new byte[0], "save.ram");
_core.GetSaveRam();
return _exe.RemoveTransientFile("save.ram");
}
public new void StoreSaveRam(byte[] data)
{
_exe.AddReadonlyFile(data, "save.ram");
_core.PutSaveRam();
_exe.RemoveReadonlyFile("save.ram");
}
private Settings _settings;
private SyncSettings _syncSettings;
public class Settings
{
[DisplayName("Show SGB Border")]
[DefaultValue(true)]
public bool ShowSgbBorder { get; set; }
public Settings Clone()
{
return (Settings)MemberwiseClone();
}
public static bool NeedsReboot(Settings x, Settings y)
{
return false;
}
public Settings()
{
SettingsUtil.SetDefaultValues(this);
}
}
public class SyncSettings
{
[DisplayName("Initial Time")]
[Description("Initial time of emulation. Only relevant when UseRealTime is false.")]
[DefaultValue(typeof(DateTime), "2010-01-01")]
public DateTime InitialTime { get; set; }
[DisplayName("Use RealTime")]
[Description("If true, RTC clock will be based off of real time instead of emulated time. Ignored (set to false) when recording a movie.")]
[DefaultValue(false)]
public bool UseRealTime { get; set; }
[Description("If true, real BIOS files will be used. Ignored in SGB mode.")]
[DefaultValue(false)]
public bool UseRealBIOS { get; set; }
public SyncSettings Clone()
{
return (SyncSettings)MemberwiseClone();
}
public static bool NeedsReboot(SyncSettings x, SyncSettings y)
{
return !DeepEquality.DeepEquals(x, y);
}
public SyncSettings()
{
SettingsUtil.SetDefaultValues(this);
}
}
public Settings GetSettings()
{
return _settings.Clone();
}
public SyncSettings GetSyncSettings()
{
return _syncSettings.Clone();
}
public PutSettingsDirtyBits PutSettings(Settings o)
{
var ret = Settings.NeedsReboot(_settings, o);
_settings = o;
return ret ? PutSettingsDirtyBits.RebootCore : PutSettingsDirtyBits.None;
}
public PutSettingsDirtyBits PutSyncSettings(SyncSettings o)
{
var ret = SyncSettings.NeedsReboot(_syncSettings, o);
_syncSettings = o;
return ret ? PutSettingsDirtyBits.RebootCore : PutSettingsDirtyBits.None;
}
protected override LibWaterboxCore.FrameInfo FrameAdvancePrep(IController controller, bool render, bool rendersound)
{
return new LibSameboy.FrameInfo
{
Time = GetRtcTime(!DeterministicEmulation),
Keys = GetButtons(controller)
};
}
protected override unsafe void FrameAdvancePost()
{
if (_frontendScanlineCallback != null && _scanlineCallbackLine == -1)
_frontendScanlineCallback(_core.GetIoReg(0x40));
if (_sgb && !_settings.ShowSgbBorder)
{
fixed(int *buff = _videoBuffer)
{
int* dst = buff;
int* src = buff + (224 - 144) / 2 * 256 + (256 - 160) / 2;
for (int j = 0; j < 144; j++)
{
for (int i = 0; i < 160; i++)
{
*dst++ = *src++;
}
src += 256 - 160;
}
}
BufferWidth = 160;
BufferHeight = 144;
}
}
protected override void LoadStateBinaryInternal(BinaryReader reader)
{
UpdateCoreScanlineCallback(false);
UpdateCorePrinterCallback();
}
public bool IsCGBMode() => _cgb;
public IGPUMemoryAreas LockGPU()
{
_exe.Enter();
try
{
return new GPUMemoryAreas(_exe)
{
Vram = _cachedGpuPointers[0],
Oam = _cachedGpuPointers[1],
Sppal = _cachedGpuPointers[3],
Bgpal = _cachedGpuPointers[2]
};
}
catch
{
_exe.Exit();
throw;
}
}
private class GPUMemoryAreas : IGPUMemoryAreas
{
private IMonitor _monitor;
public IntPtr Vram { get; init; }
public IntPtr Oam { get; init; }
public IntPtr Sppal { get; init; }
public IntPtr Bgpal { get; init; }
public GPUMemoryAreas(IMonitor monitor)
{
_monitor = monitor;
}
public void Dispose()
{
_monitor?.Exit();
_monitor = null;
}
}
private readonly ScanlineCallback _coreScanlineCallback;
private ScanlineCallback _frontendScanlineCallback;
private int _scanlineCallbackLine;
private void ScanlineCallbackRelay(byte lcdc)
{
_frontendScanlineCallback?.Invoke(lcdc);
}
public void SetScanlineCallback(ScanlineCallback callback, int line)
{
_frontendScanlineCallback = callback;
_scanlineCallbackLine = line;
UpdateCoreScanlineCallback(true);
}
private void UpdateCoreScanlineCallback(bool now)
{
if (_frontendScanlineCallback == null)
{
_core.SetScanlineCallback(null, -1);
}
else
{
if (_scanlineCallbackLine >= 0 && _scanlineCallbackLine <= 153)
{
_core.SetScanlineCallback(_coreScanlineCallback, _scanlineCallbackLine);
}
else
{
_core.SetScanlineCallback(null, -1);
if (_scanlineCallbackLine == -2 && now)
{
_frontendScanlineCallback(_core.GetIoReg(0x40));
}
}
}
}
private readonly PrinterCallback _corePrinterCallback;
private PrinterCallback _frontendPrinterCallback;
private void PrinterCallbackRelay(IntPtr image, byte height, byte top_margin, byte bottom_margin, byte exposure)
{
_frontendPrinterCallback?.Invoke(image, height, top_margin, bottom_margin, exposure);
}
public void SetPrinterCallback(PrinterCallback callback)
{
_frontendPrinterCallback = callback;
UpdateCorePrinterCallback();
}
private void UpdateCorePrinterCallback()
{
_core.SetPrinterCallback(_frontendPrinterCallback != null ? _corePrinterCallback : null);
}
}
}

1
src/BizHawk.Emulation.Cores/CoreNames.cs
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@ -44,7 +44,6 @@ namespace BizHawk.Emulation.Cores
public const string PceHawk = "PCEHawk";
public const string PicoDrive = "PicoDrive";
public const string QuickNes = "QuickNes";
public const string SameBoy = "SameBoy";
public const string Saturnus = "Saturnus";
public const string SMSHawk = "SMSHawk";
public const string Snes9X = "Snes9x";

1
waterbox/make-all-cores.sh
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@ -6,7 +6,6 @@ cd libco && make -f Makefile $1 -j && cd -
cd gpgx && make -f Makefile $1 -j && cd -
cd libsnes && make -f Makefile $1 -j && cd -
cd picodrive && make -f Makefile $1 -j && cd -
cd sameboy && make -f Makefile $1 -j && cd -
cd snes9x && make -f Makefile $1 -j && cd -
cd uzem && make -f Makefile $1 -j && cd -
cd vb && make -f Makefile $1 -j && cd -

1
waterbox/readme.txt
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@ -56,7 +56,6 @@ It consists of a modified musl libc, and build scripts to tie it all together.
cd nyma && make -f pcfx.mak install
cd nyma && make -f ss.mak install
cd picodrive && make install
cd sameboy && make install
cd snes9x && make install
cd uzem && make install
cd vb && make install

6
waterbox/sameboy/.vscode/settings.json vendored
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@ -1,6 +0,0 @@
// Place your settings in this file to overwrite default and user settings.
{
"editor.tabSize": 4,
"editor.insertSpaces": false,
"editor.detectIndentation": false
}

1
waterbox/sameboy/CHANGES.md
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@ -1 +0,0 @@
See https://sameboy.github.io/changelog/

21
waterbox/sameboy/LICENSE
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@ -1,21 +0,0 @@
MIT License
Copyright (c) 2015-2017 Lior Halphon
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

17
waterbox/sameboy/Makefile
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@ -1,17 +0,0 @@
FLAGS := -Wall -Werror=int-to-pointer-cast \
-Wno-multichar \
-fomit-frame-pointer -DGB_INTERNAL -D_GNU_SOURCE
CCFLAGS := $(FLAGS) \
-std=gnu99 \
-DLSB_FIRST -Werror=pointer-to-int-cast -Werror=implicit-function-declaration
CXXFLAGS := $(FLAGS) -DSPC_NO_COPY_STATE_FUNCS -std=c++0x -fno-exceptions -fno-rtti
TARGET := sameboy.wbx
C_SRCS = $(shell find $(ROOT_DIR) -type f -name '*.c')
CPP_SRCS = $(shell find $(ROOT_DIR) -type f -name '*.cpp')
SRCS = $(C_SRCS) $(CPP_SRCS)
include ../common.mak

51
waterbox/sameboy/README.md
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@ -1,51 +0,0 @@
# SameBoy
SameBoy is an open source Gameboy (DMG) and Gameboy Color (CGB) emulator, written in portable C. It has a native Cocoa frontend for OS X, and an incomplete experimental SDL frontend for other operating systems. It also includes a text-based debugger with an expression evaluator. Visit [the website](https://sameboy.github.io/).
## Features
Features common to both Cocoa and SDL versions:
* Supports Gameboy (DMG) and Gameboy Color (CGB) emulation
* Lets you choose the model you want to emulate regardless of ROM
* High quality 96KHz audio
* Battery save support
* Save states
* Includes open source DMG and CGB boot ROMs:
* Complete support for (and documentation of) *all* game-specific palettes in the CGB boot ROM, for accurate emulation of Gameboy games on a Gameboy Color
* Supports manual palette selection with key combinations, with 4 additional new palettes (A + B + direction)
* Supports palette selection in a CGB game, forcing it to run in 'paletted' DMG mode, if ROM allows doing so.
* Support for games with a non-Nintendo logo in the header
* No long animation in the DMG boot
* Advanced text-based debugger with an expression evaluator, disassembler, conditional breakpoints, conditional watchpoints, backtracing and other features
* Emulates [PCM_12 and PCM_34 registers](https://github.com/LIJI32/GBVisualizer)
* Emulates LCD timing effects, supporting the Demotronic trick, [GBVideoPlayer](https://github.com/LIJI32/GBVideoPlayer) and other tech demos
* Extermely high accuracy
* Real time clock emulation
Features currently supported only with the Cocoa version:
* Native Cocoa interface, with support for all system-wide features, such as drag-and-drop and smart titlebars
* Retina display support, allowing a wider range of scaling factors without artifacts
* Optional frame blending
* Several [scaling algorithms](https://sameboy.github.io/scaling/) (Including exclusive algorithms like OmniScale and Anti-aliased Scale2x)
* GameBoy Camera support
[Read more](https://sameboy.github.io/features/).
## Compatibility
SameBoy passes many of [blargg's test ROMs](http://gbdev.gg8.se/wiki/articles/Test_ROMs#Blargg.27s_tests), as well as 77 out of 78 of [mooneye-gb's](https://github.com/Gekkio/mooneye-gb) tests (Some tests require the original boot ROMs). SameBoy should work with most games and demos, please [report](https://github.com/LIJI32/SameBoy/issues/new) any broken ROM. The latest results for SameBoy's automatic tester are available [here](https://sameboy.github.io/automation/).
## Compilation
SameBoy requires the following tools and libraries to build:
* clang
* make
* Cocoa port: OS X SDK and Xcode command line tools
* SDL port: SDL2.framework (OS X) or libsdl2 (Other platforms)
* [rgbds](https://github.com/bentley/rgbds/releases/), for boot ROM compilation
On Windows, SameBoy also requires:
* Visual Studio (For headers, etc.)
* [GnuWin](http://gnuwin32.sourceforge.net/)
* Running vcvars32 before running make. Make sure all required tools and libraries are in %PATH% and %lib%, repsectively.
To compile, simply run `make`. The targets are cocoa (Default for OS X), sdl (Default for everything else), bootroms and tester. You may also specify CONF=debug (default), CONF=release or CONF=native_release to control optimization and symbols. native_release is faster than release, but is optimized to the host's CPU and therefore is not portable. You may set BOOTROMS_DIR=... to a directory containing precompiled dmg_boot.bin and cgb_boot.bin files, otherwise the build system will compile and use SameBoy's own boot ROMs.
SameBoy was compiled and tested on macOS, Ubuntu and 32-bit Windows 7.

402
waterbox/sameboy/apu.c
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@ -1,402 +0,0 @@
#include <stdint.h>
#include <math.h>
#include <string.h>
#include "gb.h"
#undef max
#define max(a,b) \
({ __typeof__ (a) _a = (a); \
__typeof__ (b) _b = (b); \
_a > _b ? _a : _b; })
#undef min
#define min(a,b) \
({ __typeof__ (a) _a = (a); \
__typeof__ (b) _b = (b); \
_a < _b ? _a : _b; })
#define APU_FREQUENCY 0x80000
static int16_t generate_square(uint64_t phase, uint32_t wave_length, int16_t amplitude, uint8_t duty)
{
if (!wave_length) return 0;
if (phase % wave_length > wave_length * duty / 8) {
return amplitude;
}
return 0;
}
static int16_t generate_wave(uint64_t phase, uint32_t wave_length, int16_t amplitude, int8_t *wave, uint8_t shift)
{
if (!wave_length) wave_length = 1;
phase = phase % wave_length;
return ((wave[(int)(phase * 32 / wave_length)]) >> shift) * (int)amplitude / 0xF;
}
static int16_t generate_noise(int16_t amplitude, uint16_t lfsr)
{
if (lfsr & 1) {
return amplitude;
}
return 0;
}
static int16_t step_lfsr(uint16_t lfsr, bool uses_7_bit)
{
bool xor = (lfsr & 1) ^ ((lfsr & 2) >> 1);
lfsr >>= 1;
if (xor) {
lfsr |= 0x4000;
}
if (uses_7_bit) {
lfsr &= ~0x40;
if (xor) {
lfsr |= 0x40;
}
}
return lfsr;
}
/* General Todo: The APU emulation seems to fail many accuracy tests. It might require a rewrite with
these tests in mind. */
static void GB_apu_run_internal(GB_gameboy_t *gb)
{
uint32_t steps = gb->apu.apu_cycles / (CPU_FREQUENCY/APU_FREQUENCY);
if (!steps)
return;
gb->apu.apu_cycles %= (CPU_FREQUENCY/APU_FREQUENCY);
for (uint8_t i = 0; i < 4; i++) {
/* Phase */
gb->apu.wave_channels[i].phase += steps;
while (gb->apu.wave_channels[i].wave_length && gb->apu.wave_channels[i].phase >= gb->apu.wave_channels[i].wave_length) {
if (i == 3) {
gb->apu.lfsr = step_lfsr(gb->apu.lfsr, gb->apu.lfsr_7_bit);
}
gb->apu.wave_channels[i].phase -= gb->apu.wave_channels[i].wave_length;
}
/* Stop on Length */
if (gb->apu.wave_channels[i].stop_on_length) {
if (gb->apu.wave_channels[i].sound_length > 0) {
gb->apu.wave_channels[i].sound_length -= steps;
}
if (gb->apu.wave_channels[i].sound_length <= 0) {
gb->apu.wave_channels[i].amplitude = 0;
gb->apu.wave_channels[i].is_playing = false;
gb->apu.wave_channels[i].sound_length = i == 2? APU_FREQUENCY : APU_FREQUENCY / 4;
}
}
}
gb->apu.envelope_step_timer += steps;
while (gb->apu.envelope_step_timer >= APU_FREQUENCY / 64) {
gb->apu.envelope_step_timer -= APU_FREQUENCY / 64;
for (uint8_t i = 0; i < 4; i++) {
if (gb->apu.wave_channels[i].envelope_steps && !--gb->apu.wave_channels[i].cur_envelope_steps) {
gb->apu.wave_channels[i].amplitude = min(max(gb->apu.wave_channels[i].amplitude + gb->apu.wave_channels[i].envelope_direction * CH_STEP, 0), MAX_CH_AMP);
gb->apu.wave_channels[i].cur_envelope_steps = gb->apu.wave_channels[i].envelope_steps;
}
}
}
gb->apu.sweep_step_timer += steps;
while (gb->apu.sweep_step_timer >= APU_FREQUENCY / 128) {
gb->apu.sweep_step_timer -= APU_FREQUENCY / 128;
if (gb->apu.wave_channels[0].sweep_steps && !--gb->apu.wave_channels[0].cur_sweep_steps) {
// Convert back to GB format
uint16_t temp = 2048 - gb->apu.wave_channels[0].wave_length / (APU_FREQUENCY / 131072);
// Apply sweep
temp = temp + gb->apu.wave_channels[0].sweep_direction *
(temp / (1 << gb->apu.wave_channels[0].sweep_shift));
if (temp > 2047) {
temp = 0;
}
// Back to frequency
gb->apu.wave_channels[0].wave_length = (2048 - temp) * (APU_FREQUENCY / 131072);
gb->apu.wave_channels[0].cur_sweep_steps = gb->apu.wave_channels[0].sweep_steps;
}
}
}
void GB_apu_get_samples_and_update_pcm_regs(GB_gameboy_t *gb, GB_sample_t *samples)
{
GB_apu_run_internal(gb);
samples->left = samples->right = 0;
if (!gb->apu.global_enable) {
return;
}
gb->io_registers[GB_IO_PCM_12] = 0;
gb->io_registers[GB_IO_PCM_34] = 0;
{
int16_t sample = generate_square(gb->apu.wave_channels[0].phase,
gb->apu.wave_channels[0].wave_length,
gb->apu.wave_channels[0].amplitude,
gb->apu.wave_channels[0].duty);
if (gb->apu.wave_channels[0].left_on ) samples->left += sample;
if (gb->apu.wave_channels[0].right_on) samples->right += sample;
gb->io_registers[GB_IO_PCM_12] = ((int)sample) * 0xF / MAX_CH_AMP;
}
{
int16_t sample = generate_square(gb->apu.wave_channels[1].phase,
gb->apu.wave_channels[1].wave_length,
gb->apu.wave_channels[1].amplitude,
gb->apu.wave_channels[1].duty);
if (gb->apu.wave_channels[1].left_on ) samples->left += sample;
if (gb->apu.wave_channels[1].right_on) samples->right += sample;
gb->io_registers[GB_IO_PCM_12] |= (((int)sample) * 0xF / MAX_CH_AMP) << 4;
}
if (gb->apu.wave_channels[2].is_playing)
{
int16_t sample = generate_wave(gb->apu.wave_channels[2].phase,
gb->apu.wave_channels[2].wave_length,
MAX_CH_AMP,
gb->apu.wave_form,
gb->apu.wave_shift);
if (gb->apu.wave_channels[2].left_on ) samples->left += sample;
if (gb->apu.wave_channels[2].right_on) samples->right += sample;
gb->io_registers[GB_IO_PCM_34] = ((int)sample) * 0xF / MAX_CH_AMP;
}
{
int16_t sample = generate_noise(gb->apu.wave_channels[3].amplitude,
gb->apu.lfsr);
if (gb->apu.wave_channels[3].left_on ) samples->left += sample;
if (gb->apu.wave_channels[3].right_on) samples->right += sample;
gb->io_registers[GB_IO_PCM_34] |= (((int)sample) * 0xF / MAX_CH_AMP) << 4;
}
samples->left = (int) samples->left * gb->apu.left_volume / 7;
samples->right = (int) samples->right * gb->apu.right_volume / 7;
}
void GB_apu_run(GB_gameboy_t *gb)
{
GB_sample_t sample;
GB_apu_get_samples_and_update_pcm_regs(gb, &sample);
gb->sample_callback(gb, sample, gb->cycles_since_epoch);
}
void GB_apu_init(GB_gameboy_t *gb)
{
memset(&gb->apu, 0, sizeof(gb->apu));
gb->apu.wave_channels[0].duty = gb->apu.wave_channels[1].duty = 4;
gb->apu.lfsr = 0x7FFF;
gb->apu.left_volume = 7;
gb->apu.right_volume = 7;
for (int i = 0; i < 4; i++) {
gb->apu.wave_channels[i].left_on = gb->apu.wave_channels[i].right_on = 1;
}
}
uint8_t GB_apu_read(GB_gameboy_t *gb, uint8_t reg)
{
GB_apu_run_internal(gb);
if (reg == GB_IO_NR52) {
uint8_t value = 0;
for (int i = 0; i < 4; i++) {
value >>= 1;
if (gb->apu.wave_channels[i].is_playing) {
value |= 0x8;
}
}
if (gb->apu.global_enable) {
value |= 0x80;
}
value |= 0x70;
return value;
}
static const char read_mask[GB_IO_WAV_END - GB_IO_NR10 + 1] = {
/* NRX0 NRX1 NRX2 NRX3 NRX4 */
0x80, 0x3F, 0x00, 0xFF, 0xBF, // NR1X
0xFF, 0x3F, 0x00, 0xFF, 0xBF, // NR2X
0x7F, 0xFF, 0x9F, 0xFF, 0xBF, // NR3X
0xFF, 0xFF, 0x00, 0x00, 0xBF, // NR4X
0x00, 0x00, 0x70, 0xFF, 0xFF, // NR5X
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // Unused
// Wave RAM
0, /* ... */
};
if (reg >= GB_IO_WAV_START && reg <= GB_IO_WAV_END && gb->apu.wave_channels[2].is_playing) {
if (gb->apu.wave_channels[2].wave_length == 0) {
return gb->apu.wave_form[0];
}
gb->apu.wave_channels[2].phase %= gb->apu.wave_channels[2].wave_length;
return gb->apu.wave_form[(int)(gb->apu.wave_channels[2].phase * 32 / gb->apu.wave_channels[2].wave_length)];
}
return gb->io_registers[reg] | read_mask[reg - GB_IO_NR10];
}
void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
{
GB_apu_run_internal(gb);
static const uint8_t duties[] = {1, 2, 4, 6}; /* Values are in 1/8 */
uint8_t channel = 0;
if (!gb->apu.global_enable && reg != GB_IO_NR52) {
return;
}
gb->io_registers[reg] = value;
switch (reg) {
case GB_IO_NR10:
case GB_IO_NR11:
case GB_IO_NR12:
case GB_IO_NR13:
case GB_IO_NR14:
channel = 0;
break;
case GB_IO_NR21:
case GB_IO_NR22:
case GB_IO_NR23:
case GB_IO_NR24:
channel = 1;
break;
case GB_IO_NR33:
case GB_IO_NR34:
channel = 2;
break;
case GB_IO_NR41:
case GB_IO_NR42:
channel = 3;
default:
break;
}
switch (reg) {
case GB_IO_NR10:
gb->apu.wave_channels[channel].sweep_direction = value & 8? -1 : 1;
gb->apu.wave_channels[channel].cur_sweep_steps =
gb->apu.wave_channels[channel].sweep_steps = (value & 0x70) >> 4;
gb->apu.wave_channels[channel].sweep_shift = value & 7;
break;
case GB_IO_NR11:
case GB_IO_NR21:
case GB_IO_NR41:
gb->apu.wave_channels[channel].duty = duties[value >> 6];
gb->apu.wave_channels[channel].sound_length = (64 - (value & 0x3F)) * (APU_FREQUENCY / 256);
if (gb->apu.wave_channels[channel].sound_length == 0) {
gb->apu.wave_channels[channel].is_playing = false;
}
break;
case GB_IO_NR12:
case GB_IO_NR22:
case GB_IO_NR42:
gb->apu.wave_channels[channel].start_amplitude =
gb->apu.wave_channels[channel].amplitude = CH_STEP * (value >> 4);
if (value >> 4 == 0) {
gb->apu.wave_channels[channel].is_playing = false;
}
gb->apu.wave_channels[channel].envelope_direction = value & 8? 1 : -1;
gb->apu.wave_channels[channel].cur_envelope_steps =
gb->apu.wave_channels[channel].envelope_steps = value & 7;
break;
case GB_IO_NR13:
case GB_IO_NR23:
case GB_IO_NR33:
gb->apu.wave_channels[channel].NRX3_X4_temp = (gb->apu.wave_channels[channel].NRX3_X4_temp & 0xFF00) | value;
gb->apu.wave_channels[channel].wave_length = (2048 - gb->apu.wave_channels[channel].NRX3_X4_temp) * (APU_FREQUENCY / 131072);
if (channel == 2) {
gb->apu.wave_channels[channel].wave_length *= 2;
}
break;
case GB_IO_NR14:
case GB_IO_NR24:
case GB_IO_NR34:
gb->apu.wave_channels[channel].stop_on_length = value & 0x40;
if ((value & 0x80) && (channel != 2 || gb->apu.wave_enable)) {
gb->apu.wave_channels[channel].is_playing = true;
gb->apu.wave_channels[channel].phase = 0;
gb->apu.wave_channels[channel].amplitude = gb->apu.wave_channels[channel].start_amplitude;
gb->apu.wave_channels[channel].cur_envelope_steps = gb->apu.wave_channels[channel].envelope_steps;
}
gb->apu.wave_channels[channel].NRX3_X4_temp = (gb->apu.wave_channels[channel].NRX3_X4_temp & 0xFF) | ((value & 0x7) << 8);
gb->apu.wave_channels[channel].wave_length = (2048 - gb->apu.wave_channels[channel].NRX3_X4_temp) * (APU_FREQUENCY / 131072);
if (channel == 2) {
gb->apu.wave_channels[channel].wave_length *= 2;
}
break;
case GB_IO_NR30:
gb->apu.wave_enable = value & 0x80;
gb->apu.wave_channels[2].is_playing &= gb->apu.wave_enable;
break;
case GB_IO_NR31:
gb->apu.wave_channels[2].sound_length = (256 - value) * (APU_FREQUENCY / 256);
if (gb->apu.wave_channels[2].sound_length == 0) {
gb->apu.wave_channels[2].is_playing = false;
}
break;
case GB_IO_NR32:
gb->apu.wave_shift = ((value >> 5) + 3) & 3;
if (gb->apu.wave_shift == 3) {
gb->apu.wave_shift = 4;
}
break;
case GB_IO_NR43:
{
double r = value & 0x7;
if (r == 0) r = 0.5;
uint8_t s = value >> 4;
gb->apu.wave_channels[3].wave_length = r * (1 << s) * (APU_FREQUENCY / 262144) ;
gb->apu.lfsr_7_bit = value & 0x8;
break;
}
case GB_IO_NR44:
gb->apu.wave_channels[3].stop_on_length = value & 0x40;
if (value & 0x80) {
gb->apu.wave_channels[3].is_playing = true;
gb->apu.lfsr = 0x7FFF;
gb->apu.wave_channels[3].amplitude = gb->apu.wave_channels[3].start_amplitude;
gb->apu.wave_channels[3].cur_envelope_steps = gb->apu.wave_channels[3].envelope_steps;
}
break;
case GB_IO_NR50:
gb->apu.left_volume = (value & 7);
gb->apu.right_volume = ((value >> 4) & 7);
break;
case GB_IO_NR51:
for (int i = 0; i < 4; i++) {
gb->apu.wave_channels[i].left_on = value & 1;
gb->apu.wave_channels[i].right_on = value & 0x10;
value >>= 1;
}
break;
case GB_IO_NR52:
if ((value & 0x80) && !gb->apu.global_enable) {
GB_apu_init(gb);
gb->apu.global_enable = true;
}
else if (!(value & 0x80) && gb->apu.global_enable) {
memset(&gb->apu, 0, sizeof(gb->apu));
memset(gb->io_registers + GB_IO_NR10, 0, GB_IO_WAV_START - GB_IO_NR10);
}
break;
default:
if (reg >= GB_IO_WAV_START && reg <= GB_IO_WAV_END) {
gb->apu.wave_form[(reg - GB_IO_WAV_START) * 2] = value >> 4;
gb->apu.wave_form[(reg - GB_IO_WAV_START) * 2 + 1] = value & 0xF;
}
break;
}
}

65
waterbox/sameboy/apu.h
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@ -1,65 +0,0 @@
#ifndef apu_h
#define apu_h
#include <stdbool.h>
#include <stdint.h>
#include "gb_struct_def.h"
/* Divides nicely and never overflows with 4 channels */
#define MAX_CH_AMP 0x1E00
#define CH_STEP (0x1E00/0xF)
typedef struct
{
int16_t left;
int16_t right;
} GB_sample_t;
/* Not all used on all channels */
/* All lengths are in APU ticks */
typedef struct
{
uint32_t phase;
uint32_t wave_length;
int32_t sound_length;
bool stop_on_length;
uint8_t duty;
int16_t amplitude;
int16_t start_amplitude;
uint8_t envelope_steps;
uint8_t cur_envelope_steps;
int8_t envelope_direction;
uint8_t sweep_steps;
uint8_t cur_sweep_steps;
int8_t sweep_direction;
uint8_t sweep_shift;
bool is_playing;
uint16_t NRX3_X4_temp;
bool left_on;
bool right_on;
} GB_apu_channel_t;
typedef struct
{
uint16_t apu_cycles;
bool global_enable;
uint32_t envelope_step_timer;
uint32_t sweep_step_timer;
int8_t wave_form[32];
uint8_t wave_shift;
bool wave_enable;
uint16_t lfsr;
bool lfsr_7_bit;
uint8_t left_volume;
uint8_t right_volume;
GB_apu_channel_t wave_channels[4];
} GB_apu_t;
#ifdef GB_INTERNAL
void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value);
uint8_t GB_apu_read(GB_gameboy_t *gb, uint8_t reg);
void GB_apu_get_samples_and_update_pcm_regs(GB_gameboy_t *gb, GB_sample_t *samples);
void GB_apu_init(GB_gameboy_t *gb);
void GB_apu_run(GB_gameboy_t *gb);
#endif
#endif /* apu_h */

285
waterbox/sameboy/bizhawk.cpp
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@ -1,285 +0,0 @@
#include <stdint.h>
#include "../emulibc/emulibc.h"
#include "../emulibc/waterboxcore.h"
#include "blip_buf/blip_buf.h"
#define _Static_assert static_assert
extern "C" {
#include "gb.h"
#include "joypad.h"
#include "apu.h"
#include "sgb.h"
}
static GB_gameboy_t GB;
static uint32_t GBPixels[160 * 144];
static uint32_t *CurrentFramebuffer;
static bool sgb;
static void VBlankCallback(GB_gameboy_t *gb)
{
if (sgb)
{
sgb_take_frame(GBPixels);
sgb_render_frame(CurrentFramebuffer);
}
else
{
memcpy(CurrentFramebuffer, GBPixels, sizeof(GBPixels));
}
}
static void LogCallback(GB_gameboy_t *gb, const char *string, GB_log_attributes attributes)
{
fputs(string, stdout);
}
static uint32_t RgbEncodeCallback(GB_gameboy_t *gb, uint8_t r, uint8_t g, uint8_t b)
{
return b | g << 8 | r << 16 | 0xff000000;
}
static void InfraredCallback(GB_gameboy_t *gb, bool on, long cycles_since_last_update)
{
}
static void RumbleCallback(GB_gameboy_t *gb, bool rumble_on)
{
}
static void SerialStartCallback(GB_gameboy_t *gb, uint8_t byte_to_send)
{
}
static uint8_t SerialEndCallback(GB_gameboy_t *gb)
{
return 0;
}
static void (*FrontendInputCallback)();
static void InputCallback(GB_gameboy_t *gb)
{
FrontendInputCallback();
}
typedef void (*FrontendPrinterCallback_t)(uint32_t *image,
uint8_t height,
uint8_t top_margin,
uint8_t bottom_margin,
uint8_t exposure);
static FrontendPrinterCallback_t FrontendPrinterCallback;
static void PrinterCallback(GB_gameboy_t *gb,
uint32_t *image,
uint8_t height,
uint8_t top_margin,
uint8_t bottom_margin,
uint8_t exposure)
{
FrontendPrinterCallback(image, height, top_margin, bottom_margin, exposure);
}
static blip_t *leftblip;
static blip_t *rightblip;
const int SOUND_RATE_GB = 2097152;
const int SOUND_RATE_SGB = 2147727;
static uint64_t sound_start_clock;
static GB_sample_t sample_gb;
static GB_sample_t sample_sgb;
static void SampleCallback(GB_gameboy_t *gb, GB_sample_t sample, uint64_t clock)
{
int l = sample.left - sample_gb.left;
int r = sample.right - sample_gb.right;
if (l)
blip_add_delta(leftblip, clock - sound_start_clock, l);
if (r)
blip_add_delta(rightblip, clock - sound_start_clock, r);
sample_gb = sample;
}
static void SgbSampleCallback(int16_t sl, int16_t sr, uint64_t clock)
{
int l = sl - sample_sgb.left;
int r = sr - sample_sgb.right;
if (l)
blip_add_delta(leftblip, clock - sound_start_clock, l);
if (r)
blip_add_delta(rightblip, clock - sound_start_clock, r);
sample_sgb.left = sl;
sample_sgb.right = sr;
}
ECL_EXPORT bool Init(bool cgb, const uint8_t *spc, int spclen)
{
if (spc)
{
GB_init_sgb(&GB);
if (!sgb_init(spc, spclen))
return false;
sgb = true;
}
else if (cgb)
{
GB_init_cgb(&GB);
}
else
{
GB_init(&GB);
}
if (GB_load_boot_rom(&GB, "boot.rom") != 0)
return false;
if (GB_load_rom(&GB, "game.rom") != 0)
return false;
GB_set_pixels_output(&GB, GBPixels);
GB_set_vblank_callback(&GB, VBlankCallback);
GB_set_log_callback(&GB, LogCallback);
GB_set_rgb_encode_callback(&GB, RgbEncodeCallback);
GB_set_infrared_callback(&GB, InfraredCallback);
GB_set_rumble_callback(&GB, RumbleCallback);
GB_set_sample_callback(&GB, SampleCallback);
leftblip = blip_new(1024);
rightblip = blip_new(1024);
blip_set_rates(leftblip, sgb ? SOUND_RATE_SGB : SOUND_RATE_GB, 44100);
blip_set_rates(rightblip, sgb ? SOUND_RATE_SGB : SOUND_RATE_GB, 44100);
return true;
}
struct MyFrameInfo : public FrameInfo
{
int64_t Time;
uint32_t Keys;
};
static int FrameOverflow;
ECL_EXPORT void FrameAdvance(MyFrameInfo &f)
{
if (sgb)
{
sgb_set_controller_data((uint8_t *)&f.Keys);
}
else
{
GB_set_key_state(&GB, f.Keys & 0xff);
}
sound_start_clock = GB_epoch(&GB);
CurrentFramebuffer = f.VideoBuffer;
GB_set_lagged(&GB, true);
GB.frontend_rtc_time = f.Time;
uint32_t target = 35112 - FrameOverflow;
f.Cycles = GB_run_cycles(&GB, target);
FrameOverflow = f.Cycles - target;
if (sgb)
{
f.Width = 256;
f.Height = 224;
sgb_render_audio(GB_epoch(&GB), SgbSampleCallback);
}
else
{
f.Width = 160;
f.Height = 144;
}
blip_end_frame(leftblip, f.Cycles);
blip_end_frame(rightblip, f.Cycles);
f.Samples = blip_read_samples(leftblip, f.SoundBuffer, 2048, 1);
blip_read_samples(rightblip, f.SoundBuffer + 1, 2048, 1);
CurrentFramebuffer = NULL;
f.Lagged = GB_get_lagged(&GB);
}
static void SetMemoryArea(MemoryArea *m, GB_direct_access_t access, const char *name, int32_t flags)
{
size_t size;
m->Name = name;
m->Data = GB_get_direct_access(&GB, access, &size, nullptr);
m->Size = size;
m->Flags = flags;
}
ECL_EXPORT void GetMemoryAreas(MemoryArea *m)
{
// TODO: "System Bus"
SetMemoryArea(m + 0, GB_DIRECT_ACCESS_RAM, "WRAM", MEMORYAREA_FLAGS_WORDSIZE1 | MEMORYAREA_FLAGS_WRITABLE | MEMORYAREA_FLAGS_PRIMARY);
SetMemoryArea(m + 1, GB_DIRECT_ACCESS_ROM, "ROM", MEMORYAREA_FLAGS_WORDSIZE1);
SetMemoryArea(m + 2, GB_DIRECT_ACCESS_VRAM, "VRAM", MEMORYAREA_FLAGS_WORDSIZE1 | MEMORYAREA_FLAGS_WRITABLE);
SetMemoryArea(m + 3, GB_DIRECT_ACCESS_CART_RAM, "CartRAM", MEMORYAREA_FLAGS_WORDSIZE1 | MEMORYAREA_FLAGS_WRITABLE);
SetMemoryArea(m + 4, GB_DIRECT_ACCESS_OAM, "OAM", MEMORYAREA_FLAGS_WORDSIZE1 | MEMORYAREA_FLAGS_WRITABLE);
SetMemoryArea(m + 5, GB_DIRECT_ACCESS_HRAM, "HRAM", MEMORYAREA_FLAGS_WORDSIZE1 | MEMORYAREA_FLAGS_WRITABLE);
SetMemoryArea(m + 6, GB_DIRECT_ACCESS_IO, "IO", MEMORYAREA_FLAGS_WORDSIZE1);
SetMemoryArea(m + 7, GB_DIRECT_ACCESS_BOOTROM, "BOOTROM", MEMORYAREA_FLAGS_WORDSIZE1);
SetMemoryArea(m + 8, GB_DIRECT_ACCESS_BGP, "BGP", MEMORYAREA_FLAGS_WORDSIZE1 | MEMORYAREA_FLAGS_WRITABLE);
SetMemoryArea(m + 9, GB_DIRECT_ACCESS_OBP, "OBP", MEMORYAREA_FLAGS_WORDSIZE1 | MEMORYAREA_FLAGS_WRITABLE);
}
ECL_EXPORT void SetInputCallback(void (*callback)())
{
FrontendInputCallback = callback;
GB_set_input_callback(&GB, callback ? InputCallback : nullptr);
}
ECL_EXPORT void GetGpuMemory(void **p)
{
p[0] = GB_get_direct_access(&GB, GB_DIRECT_ACCESS_VRAM, nullptr, nullptr);
p[1] = GB_get_direct_access(&GB, GB_DIRECT_ACCESS_OAM, nullptr, nullptr);
p[2] = GB.background_palettes_rgb;
p[3] = GB.sprite_palettes_rgb;
}
ECL_EXPORT void SetScanlineCallback(void (*callback)(uint8_t), int ly)
{
GB.scanline_callback = callback;
GB.scanline_callback_ly = ly;
}
ECL_EXPORT uint8_t GetIoReg(uint8_t port)
{
return GB.io_registers[port];
}
ECL_EXPORT void PutSaveRam()
{
GB_load_battery(&GB, "save.ram");
}
ECL_EXPORT void GetSaveRam()
{
GB_save_battery(&GB, "save.ram");
}
ECL_EXPORT bool HasSaveRam()
{
if (!GB.cartridge_type->has_battery)
return false; // Nothing to save.
if (GB.mbc_ram_size == 0 && !GB.cartridge_type->has_rtc)
return false; /* Claims to have battery, but has no RAM or RTC */
return true;
}
ECL_EXPORT void SetPrinterCallback(FrontendPrinterCallback_t callback)
{
FrontendPrinterCallback = callback;
if (callback)
{
GB_connect_printer(&GB, PrinterCallback);
}
else
{
GB_set_serial_transfer_start_callback(&GB, NULL);
GB_set_serial_transfer_end_callback(&GB, NULL);
GB.printer.callback = NULL;
}
}
int main()
{
return 0;
}

344
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/* blip_buf 1.1.0. http://www.slack.net/~ant/ */
#include "blip_buf.h"
#include <assert.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
/* Library Copyright (C) 2003-2009 Shay Green. This library is free software;
you can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
library is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details. You should have received a copy of the GNU Lesser General Public
License along with this module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
#if defined (BLARGG_TEST) && BLARGG_TEST
#include "blargg_test.h"
#endif
/* Equivalent to ULONG_MAX >= 0xFFFFFFFF00000000.
Avoids constants that don't fit in 32 bits. */
#if ULONG_MAX/0xFFFFFFFF > 0xFFFFFFFF
typedef unsigned long fixed_t;
enum { pre_shift = 32 };
#elif defined(ULLONG_MAX)
typedef unsigned long long fixed_t;
enum { pre_shift = 32 };
#else
typedef unsigned fixed_t;
enum { pre_shift = 0 };
#endif
enum { time_bits = pre_shift + 20 };
static fixed_t const time_unit = (fixed_t) 1 << time_bits;
enum { bass_shift = 9 }; /* affects high-pass filter breakpoint frequency */
enum { end_frame_extra = 2 }; /* allows deltas slightly after frame length */
enum { half_width = 8 };
enum { buf_extra = half_width*2 + end_frame_extra };
enum { phase_bits = 5 };
enum { phase_count = 1 << phase_bits };
enum { delta_bits = 15 };
enum { delta_unit = 1 << delta_bits };
enum { frac_bits = time_bits - pre_shift };
/* We could eliminate avail and encode whole samples in offset, but that would
limit the total buffered samples to blip_max_frame. That could only be
increased by decreasing time_bits, which would reduce resample ratio accuracy.
*/
/** Sample buffer that resamples to output rate and accumulates samples
until they're read out */
struct blip_t
{
fixed_t factor;
fixed_t offset;
int avail;
int size;
int integrator;
};
typedef int buf_t;
/* probably not totally portable */
#define SAMPLES( buf ) ((buf_t*) ((buf) + 1))
/* Arithmetic (sign-preserving) right shift */
#define ARITH_SHIFT( n, shift ) \
((n) >> (shift))
enum { max_sample = +32767 };
enum { min_sample = -32768 };
#define CLAMP( n ) \
{\
if ( (short) n != n )\
n = ARITH_SHIFT( n, 16 ) ^ max_sample;\
}
static void check_assumptions( void )
{
int n;
#if INT_MAX < 0x7FFFFFFF || UINT_MAX < 0xFFFFFFFF
#error "int must be at least 32 bits"
#endif
assert( (-3 >> 1) == -2 ); /* right shift must preserve sign */
n = max_sample * 2;
CLAMP( n );
assert( n == max_sample );
n = min_sample * 2;
CLAMP( n );
assert( n == min_sample );
assert( blip_max_ratio <= time_unit );
assert( blip_max_frame <= (fixed_t) -1 >> time_bits );
}
blip_t* blip_new( int size )
{
blip_t* m;
assert( size >= 0 );
m = (blip_t*) malloc( sizeof *m + (size + buf_extra) * sizeof (buf_t) );
if ( m )
{
m->factor = time_unit / blip_max_ratio;
m->size = size;
blip_clear( m );
check_assumptions();
}
return m;
}
void blip_delete( blip_t* m )
{
if ( m != NULL )
{
/* Clear fields in case user tries to use after freeing */
memset( m, 0, sizeof *m );
free( m );
}
}
void blip_set_rates( blip_t* m, double clock_rate, double sample_rate )
{
double factor = time_unit * sample_rate / clock_rate;
m->factor = (fixed_t) factor;
/* Fails if clock_rate exceeds maximum, relative to sample_rate */
assert( 0 <= factor - m->factor && factor - m->factor < 1 );
/* Avoid requiring math.h. Equivalent to
m->factor = (int) ceil( factor ) */
if ( m->factor < factor )
m->factor++;
/* At this point, factor is most likely rounded up, but could still
have been rounded down in the floating-point calculation. */
}
void blip_clear( blip_t* m )
{
/* We could set offset to 0, factor/2, or factor-1. 0 is suitable if
factor is rounded up. factor-1 is suitable if factor is rounded down.
Since we don't know rounding direction, factor/2 accommodates either,
with the slight loss of showing an error in half the time. Since for
a 64-bit factor this is years, the halving isn't a problem. */
m->offset = m->factor / 2;
m->avail = 0;
m->integrator = 0;
memset( SAMPLES( m ), 0, (m->size + buf_extra) * sizeof (buf_t) );
}
int blip_clocks_needed( const blip_t* m, int samples )
{
fixed_t needed;
/* Fails if buffer can't hold that many more samples */
assert( samples >= 0 && m->avail + samples <= m->size );
needed = (fixed_t) samples * time_unit;
if ( needed < m->offset )
return 0;
return (needed - m->offset + m->factor - 1) / m->factor;
}
void blip_end_frame( blip_t* m, unsigned t )
{
fixed_t off = t * m->factor + m->offset;
m->avail += off >> time_bits;
m->offset = off & (time_unit - 1);
/* Fails if buffer size was exceeded */
assert( m->avail <= m->size );
}
int blip_samples_avail( const blip_t* m )
{
return m->avail;
}
static void remove_samples( blip_t* m, int count )
{
buf_t* buf = SAMPLES( m );
int remain = m->avail + buf_extra - count;
m->avail -= count;
memmove( &buf [0], &buf [count], remain * sizeof buf [0] );
memset( &buf [remain], 0, count * sizeof buf [0] );
}
int blip_read_samples( blip_t* m, short out [], int count, int stereo )
{
assert( count >= 0 );
if ( count > m->avail )
count = m->avail;
if ( count )
{
int const step = stereo ? 2 : 1;
buf_t const* in = SAMPLES( m );
buf_t const* end = in + count;
int sum = m->integrator;
do
{
/* Eliminate fraction */
int s = ARITH_SHIFT( sum, delta_bits );
sum += *in++;
CLAMP( s );
*out = s;
out += step;
/* High-pass filter */
sum -= s << (delta_bits - bass_shift);
}
while ( in != end );
m->integrator = sum;
remove_samples( m, count );
}
return count;
}
/* Things that didn't help performance on x86:
__attribute__((aligned(128)))
#define short int
restrict
*/
/* Sinc_Generator( 0.9, 0.55, 4.5 ) */
static short const bl_step [phase_count + 1] [half_width] =
{
{ 43, -115, 350, -488, 1136, -914, 5861,21022},
{ 44, -118, 348, -473, 1076, -799, 5274,21001},
{ 45, -121, 344, -454, 1011, -677, 4706,20936},
{ 46, -122, 336, -431, 942, -549, 4156,20829},
{ 47, -123, 327, -404, 868, -418, 3629,20679},
{ 47, -122, 316, -375, 792, -285, 3124,20488},
{ 47, -120, 303, -344, 714, -151, 2644,20256},
{ 46, -117, 289, -310, 634, -17, 2188,19985},
{ 46, -114, 273, -275, 553, 117, 1758,19675},
{ 44, -108, 255, -237, 471, 247, 1356,19327},
{ 43, -103, 237, -199, 390, 373, 981,18944},
{ 42, -98, 218, -160, 310, 495, 633,18527},
{ 40, -91, 198, -121, 231, 611, 314,18078},
{ 38, -84, 178, -81, 153, 722, 22,17599},
{ 36, -76, 157, -43, 80, 824, -241,17092},
{ 34, -68, 135, -3, 8, 919, -476,16558},
{ 32, -61, 115, 34, -60, 1006, -683,16001},
{ 29, -52, 94, 70, -123, 1083, -862,15422},
{ 27, -44, 73, 106, -184, 1152,-1015,14824},
{ 25, -36, 53, 139, -239, 1211,-1142,14210},
{ 22, -27, 34, 170, -290, 1261,-1244,13582},
{ 20, -20, 16, 199, -335, 1301,-1322,12942},
{ 18, -12, -3, 226, -375, 1331,-1376,12293},
{ 15, -4, -19, 250, -410, 1351,-1408,11638},
{ 13, 3, -35, 272, -439, 1361,-1419,10979},
{ 11, 9, -49, 292, -464, 1362,-1410,10319},
{ 9, 16, -63, 309, -483, 1354,-1383, 9660},
{ 7, 22, -75, 322, -496, 1337,-1339, 9005},
{ 6, 26, -85, 333, -504, 1312,-1280, 8355},
{ 4, 31, -94, 341, -507, 1278,-1205, 7713},
{ 3, 35, -102, 347, -506, 1238,-1119, 7082},
{ 1, 40, -110, 350, -499, 1190,-1021, 6464},
{ 0, 43, -115, 350, -488, 1136, -914, 5861}
};
/* Shifting by pre_shift allows calculation using unsigned int rather than
possibly-wider fixed_t. On 32-bit platforms, this is likely more efficient.
And by having pre_shift 32, a 32-bit platform can easily do the shift by
simply ignoring the low half. */
void blip_add_delta( blip_t* m, unsigned time, int delta )
{
unsigned fixed = (unsigned) ((time * m->factor + m->offset) >> pre_shift);
buf_t* out = SAMPLES( m ) + m->avail + (fixed >> frac_bits);
int const phase_shift = frac_bits - phase_bits;
int phase = fixed >> phase_shift & (phase_count - 1);
short const* in = bl_step [phase];
short const* rev = bl_step [phase_count - phase];
int interp = fixed >> (phase_shift - delta_bits) & (delta_unit - 1);
int delta2 = (delta * interp) >> delta_bits;
delta -= delta2;
/* Fails if buffer size was exceeded */
assert( out <= &SAMPLES( m ) [m->size + end_frame_extra] );
out [0] += in[0]*delta + in[half_width+0]*delta2;
out [1] += in[1]*delta + in[half_width+1]*delta2;
out [2] += in[2]*delta + in[half_width+2]*delta2;
out [3] += in[3]*delta + in[half_width+3]*delta2;
out [4] += in[4]*delta + in[half_width+4]*delta2;
out [5] += in[5]*delta + in[half_width+5]*delta2;
out [6] += in[6]*delta + in[half_width+6]*delta2;
out [7] += in[7]*delta + in[half_width+7]*delta2;
in = rev;
out [ 8] += in[7]*delta + in[7-half_width]*delta2;
out [ 9] += in[6]*delta + in[6-half_width]*delta2;
out [10] += in[5]*delta + in[5-half_width]*delta2;
out [11] += in[4]*delta + in[4-half_width]*delta2;
out [12] += in[3]*delta + in[3-half_width]*delta2;
out [13] += in[2]*delta + in[2-half_width]*delta2;
out [14] += in[1]*delta + in[1-half_width]*delta2;
out [15] += in[0]*delta + in[0-half_width]*delta2;
}
void blip_add_delta_fast( blip_t* m, unsigned time, int delta )
{
unsigned fixed = (unsigned) ((time * m->factor + m->offset) >> pre_shift);
buf_t* out = SAMPLES( m ) + m->avail + (fixed >> frac_bits);
int interp = fixed >> (frac_bits - delta_bits) & (delta_unit - 1);
int delta2 = delta * interp;
/* Fails if buffer size was exceeded */
assert( out <= &SAMPLES( m ) [m->size + end_frame_extra] );
out [7] += delta * delta_unit - delta2;
out [8] += delta2;
}

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waterbox/sameboy/blip_buf/blip_buf.h
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/** \file
Sample buffer that resamples from input clock rate to output sample rate */
/* blip_buf 1.1.0 */
#ifndef BLIP_BUF_H
#define BLIP_BUF_H
#ifdef __cplusplus
extern "C" {
#endif
/** First parameter of most functions is blip_t*, or const blip_t* if nothing
is changed. */
typedef struct blip_t blip_t;
/** Creates new buffer that can hold at most sample_count samples. Sets rates
so that there are blip_max_ratio clocks per sample. Returns pointer to new
buffer, or NULL if insufficient memory. */
blip_t* blip_new( int sample_count );
/** Sets approximate input clock rate and output sample rate. For every
clock_rate input clocks, approximately sample_rate samples are generated. */
void blip_set_rates( blip_t*, double clock_rate, double sample_rate );
enum { /** Maximum clock_rate/sample_rate ratio. For a given sample_rate,
clock_rate must not be greater than sample_rate*blip_max_ratio. */
blip_max_ratio = 1 << 20 };
/** Clears entire buffer. Afterwards, blip_samples_avail() == 0. */
void blip_clear( blip_t* );
/** Adds positive/negative delta into buffer at specified clock time. */
void blip_add_delta( blip_t*, unsigned int clock_time, int delta );
/** Same as blip_add_delta(), but uses faster, lower-quality synthesis. */
void blip_add_delta_fast( blip_t*, unsigned int clock_time, int delta );
/** Length of time frame, in clocks, needed to make sample_count additional
samples available. */
int blip_clocks_needed( const blip_t*, int sample_count );
enum { /** Maximum number of samples that can be generated from one time frame. */
blip_max_frame = 4000 };
/** Makes input clocks before clock_duration available for reading as output
samples. Also begins new time frame at clock_duration, so that clock time 0 in
the new time frame specifies the same clock as clock_duration in the old time
frame specified. Deltas can have been added slightly past clock_duration (up to
however many clocks there are in two output samples). */
void blip_end_frame( blip_t*, unsigned int clock_duration );
/** Number of buffered samples available for reading. */
int blip_samples_avail( const blip_t* );
/** Reads and removes at most 'count' samples and writes them to 'out'. If
'stereo' is true, writes output to every other element of 'out', allowing easy
interleaving of two buffers into a stereo sample stream. Outputs 16-bit signed
samples. Returns number of samples actually read. */
int blip_read_samples( blip_t*, short out [], int count, int stereo );
/** Frees buffer. No effect if NULL is passed. */
void blip_delete( blip_t* );
/* Deprecated */
typedef blip_t blip_buffer_t;
#ifdef __cplusplus
}
#endif
#endif

149
waterbox/sameboy/camera.c
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#include "gb.h"
static int noise_seed = 0;
/* This is not a complete emulation of the camera chip. Only the features used by the GameBoy Camera ROMs are supported.
We also do not emulate the timing of the real cart, as it might be actually faster than the webcam. */
static uint8_t generate_noise(uint8_t x, uint8_t y)
{
int value = (x + y * 128 + noise_seed);
uint8_t *data = (uint8_t *) &value;
unsigned hash = 0;
while ((int *) data != &value + 1) {
hash ^= (*data << 8);
if (hash & 0x8000) {
hash ^= 0x8a00;
hash ^= *data;
}
data++;
hash <<= 1;
}
return (hash >> 8);
}
static long get_processed_color(GB_gameboy_t *gb, uint8_t x, uint8_t y)
{
if (x >= 128) {
x = 0;
}
if (y >= 112) {
y = 0;
}
long color = gb->camera_get_pixel_callback? gb->camera_get_pixel_callback(gb, x, y) : (generate_noise(x, y));
static const double gain_values[] =
{0.8809390, 0.9149149, 0.9457498, 0.9739758,
1.0000000, 1.0241412, 1.0466537, 1.0677433,
1.0875793, 1.1240310, 1.1568911, 1.1868043,
1.2142561, 1.2396208, 1.2743837, 1.3157323,
1.3525190, 1.3856512, 1.4157897, 1.4434309,
1.4689574, 1.4926697, 1.5148087, 1.5355703,
1.5551159, 1.5735801, 1.5910762, 1.6077008,
1.6235366, 1.6386550, 1.6531183, 1.6669808};
/* Multiply color by gain value */
color *= gain_values[gb->camera_registers[GB_CAMERA_GAIN_AND_EDGE_ENHACEMENT_FLAGS] & 0x1F];
/* Color is multiplied by the exposure register to simulate exposure. */
color = color * ((gb->camera_registers[GB_CAMERA_EXPOSURE_HIGH] << 8) + gb->camera_registers[GB_CAMERA_EXPOSURE_LOW]) / 0x1000;
return color;
}
uint8_t GB_camera_read_image(GB_gameboy_t *gb, uint16_t addr)
{
if (gb->camera_registers[GB_CAMERA_SHOOT_AND_1D_FLAGS] & 1) {
/* Forbid reading the image while the camera is busy. */
return 0xFF;
}
uint8_t tile_x = addr / 0x10 % 0x10;
uint8_t tile_y = addr / 0x10 / 0x10;
uint8_t y = ((addr >> 1) & 0x7) + tile_y * 8;
uint8_t bit = addr & 1;
uint8_t ret = 0;
for (uint8_t x = tile_x * 8; x < tile_x * 8 + 8; x++) {
long color = get_processed_color(gb, x, y);
static const double edge_enhancement_ratios[] = {0.5, 0.75, 1, 1.25, 2, 3, 4, 5};
double edge_enhancement_ratio = edge_enhancement_ratios[(gb->camera_registers[GB_CAMERA_EDGE_ENHANCEMENT_INVERT_AND_VOLTAGE] >> 4) & 0x7];
if ((gb->camera_registers[GB_CAMERA_GAIN_AND_EDGE_ENHACEMENT_FLAGS] & 0xE0) == 0xE0) {
color += (color * 4) * edge_enhancement_ratio;
color -= get_processed_color(gb, x - 1, y) * edge_enhancement_ratio;
color -= get_processed_color(gb, x + 1, y) * edge_enhancement_ratio;
color -= get_processed_color(gb, x, y - 1) * edge_enhancement_ratio;
color -= get_processed_color(gb, x, y + 1) * edge_enhancement_ratio;
}
/* The camera's registers are used as a threshold pattern, which defines the dithering */
uint8_t pattern_base = ((x & 3) + (y & 3) * 4) * 3 + GB_CAMERA_DITHERING_PATTERN_START;
if (color < gb->camera_registers[pattern_base]) {
color = 3;
}
else if (color < gb->camera_registers[pattern_base + 1]) {
color = 2;
}
else if (color < gb->camera_registers[pattern_base + 2]) {
color = 1;
}
else {
color = 0;
}
ret <<= 1;
ret |= (color >> bit) & 1;
}
return ret;
}
void GB_set_camera_get_pixel_callback(GB_gameboy_t *gb, GB_camera_get_pixel_callback_t callback)
{
gb->camera_get_pixel_callback = callback;
}
void GB_set_camera_update_request_callback(GB_gameboy_t *gb, GB_camera_update_request_callback_t callback)
{
gb->camera_update_request_callback = callback;
}
void GB_camera_updated(GB_gameboy_t *gb)
{
gb->camera_registers[GB_CAMERA_SHOOT_AND_1D_FLAGS] &= ~1;
}
void GB_camera_write_register(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
{
addr &= 0x7F;
if (addr == GB_CAMERA_SHOOT_AND_1D_FLAGS) {
value &= 0x7;
noise_seed = 42; // rand();
if ((value & 1) && !(gb->camera_registers[GB_CAMERA_SHOOT_AND_1D_FLAGS] & 1) && gb->camera_update_request_callback) {
/* If no callback is set, ignore the write as if the camera is instantly done */
gb->camera_registers[GB_CAMERA_SHOOT_AND_1D_FLAGS] |= 1;
gb->camera_update_request_callback(gb);
}
}
else {
if (addr >= 0x36) {
GB_log(gb, "Wrote invalid camera register %02x: %2x\n", addr, value);
return;
}
gb->camera_registers[addr] = value;
}
}
uint8_t GB_camera_read_register(GB_gameboy_t *gb, uint16_t addr)
{
if ((addr & 0x7F) == 0) {
return gb->camera_registers[GB_CAMERA_SHOOT_AND_1D_FLAGS];
}
return 0;
}

29
waterbox/sameboy/camera.h
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#ifndef camera_h
#define camera_h
#include <stdint.h>
#include "gb_struct_def.h"
typedef uint8_t (*GB_camera_get_pixel_callback_t)(GB_gameboy_t *gb, uint8_t x, uint8_t y);
typedef void (*GB_camera_update_request_callback_t)(GB_gameboy_t *gb);
enum {
GB_CAMERA_SHOOT_AND_1D_FLAGS = 0,
GB_CAMERA_GAIN_AND_EDGE_ENHACEMENT_FLAGS = 1,
GB_CAMERA_EXPOSURE_HIGH = 2,
GB_CAMERA_EXPOSURE_LOW = 3,
GB_CAMERA_EDGE_ENHANCEMENT_INVERT_AND_VOLTAGE = 4,
GB_CAMERA_DITHERING_PATTERN_START = 6,
GB_CAMERA_DITHERING_PATTERN_END = 0x35,
};
uint8_t GB_camera_read_image(GB_gameboy_t *gb, uint16_t addr);
void GB_set_camera_get_pixel_callback(GB_gameboy_t *gb, GB_camera_get_pixel_callback_t callback);
void GB_set_camera_update_request_callback(GB_gameboy_t *gb, GB_camera_update_request_callback_t callback);
void GB_camera_updated(GB_gameboy_t *gb);
void GB_camera_write_register(GB_gameboy_t *gb, uint16_t addr, uint8_t value);
uint8_t GB_camera_read_register(GB_gameboy_t *gb, uint16_t addr);
#endif

796
waterbox/sameboy/display.c
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#include <stdbool.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "gb.h"
/*
Each line is 456 cycles, approximately:
Mode 2 - 80 cycles / OAM Transfer
Mode 3 - 172 cycles / Rendering
Mode 0 - 204 cycles / HBlank
Mode 1 is VBlank
Todo: Mode lengths are not constants, see http://blog.kevtris.org/blogfiles/Nitty%20Gritty%20Gameboy%20VRAM%20Timing.txt
*/
#define MODE2_LENGTH (80)
#define MODE3_LENGTH (172)
#define MODE0_LENGTH (204)
#define LINE_LENGTH (MODE2_LENGTH + MODE3_LENGTH + MODE0_LENGTH) // = 456
#define LINES (144)
#define WIDTH (160)
#define VIRTUAL_LINES (LCDC_PERIOD / LINE_LENGTH) // = 154
typedef struct __attribute__((packed)) {
uint8_t y;
uint8_t x;
uint8_t tile;
uint8_t flags;
} GB_sprite_t;
static bool window_enabled(GB_gameboy_t *gb)
{
if ((gb->io_registers[GB_IO_LCDC] & 0x1) == 0) {
if (!gb->cgb_mode && gb->is_cgb) {
return false;
}
}
return (gb->io_registers[GB_IO_LCDC] & 0x20) && gb->io_registers[GB_IO_WX] < 167;
}
static uint32_t get_pixel(GB_gameboy_t *gb, uint8_t x, uint8_t y)
{
/*
Bit 7 - LCD Display Enable (0=Off, 1=On)
Bit 6 - Window Tile Map Display Select (0=9800-9BFF, 1=9C00-9FFF)
Bit 5 - Window Display Enable (0=Off, 1=On)
Bit 4 - BG & Window Tile Data Select (0=8800-97FF, 1=8000-8FFF)
Bit 3 - BG Tile Map Display Select (0=9800-9BFF, 1=9C00-9FFF)
Bit 2 - OBJ (Sprite) Size (0=8x8, 1=8x16)
Bit 1 - OBJ (Sprite) Display Enable (0=Off, 1=On)
Bit 0 - BG Display (for CGB see below) (0=Off, 1=On)
*/
uint16_t map = 0x1800;
uint8_t tile = 0;
uint8_t attributes = 0;
uint8_t sprite_palette = 0;
uint16_t tile_address = 0;
uint8_t background_pixel = 0, sprite_pixel = 0;
GB_sprite_t *sprite = (GB_sprite_t *) &gb->oam;
uint8_t sprites_in_line = 0;
bool lcd_8_16_mode = (gb->io_registers[GB_IO_LCDC] & 4) != 0;
bool sprites_enabled = (gb->io_registers[GB_IO_LCDC] & 2) != 0;
uint8_t lowest_sprite_x = 0xFF;
bool use_obp1 = false, priority = false;
bool in_window = false;
bool bg_enabled = true;
bool bg_behind = false;
if ((gb->io_registers[GB_IO_LCDC] & 0x1) == 0) {
if (gb->cgb_mode) {
bg_behind = true;
}
else {
bg_enabled = false;
}
}
if (window_enabled(gb) && y >= gb->io_registers[GB_IO_WY] && x + 7 >= gb->io_registers[GB_IO_WX] && gb->current_window_line != 0xFF) {
in_window = true;
}
if (sprites_enabled) {
// Loop all sprites
for (uint8_t i = 40; i--; sprite++) {
int sprite_y = sprite->y - 16;
int sprite_x = sprite->x - 8;
// Is sprite in our line?
if (sprite_y <= y && sprite_y + (lcd_8_16_mode? 16:8) > y) {
uint8_t tile_x, tile_y, current_sprite_pixel;
uint16_t line_address;
// Limit to 10 sprites in one scan line.
if (++sprites_in_line == 11) break;
// Does not overlap our pixel.
if (sprite_x > x || sprite_x + 8 <= x) continue;
tile_x = x - sprite_x;
tile_y = y - sprite_y;
if (sprite->flags & 0x20) tile_x = 7 - tile_x;
if (sprite->flags & 0x40) tile_y = (lcd_8_16_mode? 15:7) - tile_y;
line_address = (lcd_8_16_mode? sprite->tile & 0xFE : sprite->tile) * 0x10 + tile_y * 2;
if (gb->cgb_mode && (sprite->flags & 0x8)) {
line_address += 0x2000;
}
current_sprite_pixel = (((gb->vram[line_address ] >> ((~tile_x)&7)) & 1 ) |
((gb->vram[line_address + 1] >> ((~tile_x)&7)) & 1) << 1 );
/* From Pandocs:
When sprites with different x coordinate values overlap, the one with the smaller x coordinate
(closer to the left) will have priority and appear above any others. This applies in Non CGB Mode
only. When sprites with the same x coordinate values overlap, they have priority according to table
ordering. (i.e. $FE00 - highest, $FE04 - next highest, etc.) In CGB Mode priorities are always
assigned like this.
*/
if (current_sprite_pixel != 0) {
if (!gb->cgb_mode && sprite->x >= lowest_sprite_x) {
break;
}
sprite_pixel = current_sprite_pixel;
lowest_sprite_x = sprite->x;
use_obp1 = (sprite->flags & 0x10) != 0;
sprite_palette = sprite->flags & 7;
priority = (sprite->flags & 0x80) != 0;
if (gb->cgb_mode) {
break;
}
}
}
}
}
if (in_window) {
x -= gb->io_registers[GB_IO_WX] - 7; // Todo: This value is probably latched
y = gb->current_window_line;
}
else {
x += gb->effective_scx;
y += gb->io_registers[GB_IO_SCY];
}
if (gb->io_registers[GB_IO_LCDC] & 0x08 && !in_window) {
map = 0x1C00;
}
else if (gb->io_registers[GB_IO_LCDC] & 0x40 && in_window) {
map = 0x1C00;
}
tile = gb->vram[map + x/8 + y/8 * 32];
if (gb->cgb_mode) {
attributes = gb->vram[map + x/8 + y/8 * 32 + 0x2000];
}
if (attributes & 0x80) {
priority = !bg_behind && bg_enabled;
}
if (!priority && sprite_pixel) {
if (!gb->cgb_mode) {
sprite_pixel = (gb->io_registers[use_obp1? GB_IO_OBP1:GB_IO_OBP0] >> (sprite_pixel << 1)) & 3;
sprite_palette = use_obp1;
}
return gb->sprite_palettes_rgb[sprite_palette * 4 + sprite_pixel];
}
if (bg_enabled) {
if (gb->io_registers[GB_IO_LCDC] & 0x10) {
tile_address = tile * 0x10;
}
else {
tile_address = (int8_t) tile * 0x10 + 0x1000;
}
if (attributes & 0x8) {
tile_address += 0x2000;
}
if (attributes & 0x20) {
x = ~x;
}
if (attributes & 0x40) {
y = ~y;
}
background_pixel = (((gb->vram[tile_address + (y & 7) * 2 ] >> ((~x)&7)) & 1 ) |
((gb->vram[tile_address + (y & 7) * 2 + 1] >> ((~x)&7)) & 1) << 1 );
}
if (priority && sprite_pixel && !background_pixel) {
if (!gb->cgb_mode) {
sprite_pixel = (gb->io_registers[use_obp1? GB_IO_OBP1:GB_IO_OBP0] >> (sprite_pixel << 1)) & 3;
sprite_palette = use_obp1;
}
return gb->sprite_palettes_rgb[sprite_palette * 4 + sprite_pixel];
}
if (!gb->cgb_mode) {
background_pixel = ((gb->io_registers[GB_IO_BGP] >> (background_pixel << 1)) & 3);
}
return gb->background_palettes_rgb[(attributes & 7) * 4 + background_pixel];
}
static void display_vblank(GB_gameboy_t *gb)
{
if (!gb->disable_rendering && ((!(gb->io_registers[GB_IO_LCDC] & 0x80) || gb->stopped) || gb->frame_skip_state == GB_FRAMESKIP_LCD_TURNED_ON)) {
/* LCD is off, set screen to white */
uint32_t white = gb->rgb_encode_callback(gb, 0xFF, 0xFF, 0xFF);
for (unsigned i = 0; i < WIDTH * LINES; i++) {
gb ->screen[i] = white;
}
}
gb->vblank_callback(gb);
gb->vblank_just_occured = true;
}
static inline uint8_t scale_channel(uint8_t x)
{
x &= 0x1f;
return (x << 3) | (x >> 2);
}
void GB_palette_changed(GB_gameboy_t *gb, bool background_palette, uint8_t index)
{
uint8_t *palette_data = background_palette? gb->background_palettes_data : gb->sprite_palettes_data;
uint16_t color = palette_data[index & ~1] | (palette_data[index | 1] << 8);
// No need to &, scale channel does that.
uint8_t r = scale_channel(color);
uint8_t g = scale_channel(color >> 5);
uint8_t b = scale_channel(color >> 10);
assert (gb->rgb_encode_callback);
(background_palette? gb->background_palettes_rgb : gb->sprite_palettes_rgb)[index / 2] = gb->rgb_encode_callback(gb, r, g, b);
}
/*
STAT interrupt is implemented based on this finding:
http://board.byuu.org/phpbb3/viewtopic.php?p=25527#p25531
General timing is based on GiiBiiAdvance's documents:
https://github.com/AntonioND/giibiiadvance
*/
static void update_display_state(GB_gameboy_t *gb, uint8_t cycles)
{
uint8_t previous_stat_interrupt_line = gb->stat_interrupt_line;
gb->stat_interrupt_line = false;
if (!(gb->io_registers[GB_IO_LCDC] & 0x80)) {
/* LCD is disabled, state is constant */
/* When the LCD is off, LY is 0 and STAT mode is 0.
Todo: Verify the LY=LYC flag should be on. */
gb->io_registers[GB_IO_LY] = 0;
gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 4;
if (gb->hdma_on_hblank) {
gb->hdma_on_hblank = false;
gb->hdma_on = false;
/* Todo: is this correct? */
gb->hdma_steps_left = 0xff;
}
gb->oam_read_blocked = false;
gb->vram_read_blocked = false;
gb->oam_write_blocked = false;
gb->vram_write_blocked = false;
/* Keep sending vblanks to user even if the screen is off */
gb->display_cycles += cycles;
if (gb->display_cycles >= LCDC_PERIOD) {
/* VBlank! */
gb->display_cycles -= LCDC_PERIOD;
display_vblank(gb);
}
/* Reset window rendering state */
gb->current_window_line = 0xFF;
return;
}
uint8_t atomic_increase = gb->cgb_double_speed? 2 : 4;
uint8_t stat_delay = gb->cgb_double_speed? 2 : (gb->cgb_mode? 0 : 4);
/* Todo: This is correct for DMG. Is it correct for the 3 CGB modes (DMG/single/double)?*/
uint8_t scx_delay = ((gb->effective_scx & 7) + atomic_increase - 1) & ~(atomic_increase - 1);
/* Todo: These are correct for DMG, DMG-mode CGB, and single speed CGB. Is is correct for double speed CGB? */
uint8_t oam_blocking_rush = gb->cgb_double_speed? 2 : 4;
uint8_t vram_blocking_rush = gb->is_cgb? 0 : 4;
for (; cycles; cycles -= atomic_increase) {
gb->display_cycles += atomic_increase;
/* The very first line is 2 (4 from the CPU's perseptive) clocks shorter when the LCD turns on.
Todo: Verify on the 3 CGB modes, especially double speed mode. */
if (gb->first_scanline && gb->display_cycles >= LINE_LENGTH - atomic_increase) {
gb->first_scanline = false;
gb->display_cycles += atomic_increase;
}
bool should_compare_ly = true;
uint8_t ly_for_comparison = gb->io_registers[GB_IO_LY] = gb->display_cycles / LINE_LENGTH;
if (gb->scanline_callback && gb->display_cycles % LINE_LENGTH == 0 && gb->scanline_callback_ly == ly_for_comparison) {
gb->scanline_callback(gb->io_registers[GB_IO_LCDC]);
}
/* Handle cycle completion. STAT's initial value depends on model and mode */
if (gb->display_cycles == LCDC_PERIOD) {
/* VBlank! */
gb->display_cycles = 0;
gb->io_registers[GB_IO_STAT] &= ~3;
if (gb->is_cgb) {
if (stat_delay) {
gb->io_registers[GB_IO_STAT] |= 1;
}
else {
gb->io_registers[GB_IO_STAT] |= 2;
}
}
ly_for_comparison = gb->io_registers[GB_IO_LY] = 0;
/* Todo: verify timing */
gb->oam_read_blocked = true;
gb->vram_read_blocked = false;
gb->oam_write_blocked = true;
gb->vram_write_blocked = false;
/* Reset window rendering state */
gb->current_window_line = 0xFF;
}
/* Entered VBlank state, update STAT and IF */
else if (gb->display_cycles == LINES * LINE_LENGTH + stat_delay) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 1;
gb->io_registers[GB_IO_IF] |= 1;
/* Entering VBlank state triggers the OAM interrupt. In CGB, it happens 4 cycles earlier */
if (gb->io_registers[GB_IO_STAT] & 0x20 && !gb->is_cgb) {
gb->stat_interrupt_line = true;
}
if (gb->frame_skip_state == GB_FRAMESKIP_LCD_TURNED_ON) {
if (!gb->is_cgb) {
display_vblank(gb);
gb->frame_skip_state = GB_FRAMESKIP_SECOND_FRAME_RENDERED;
}
else {
gb->frame_skip_state = GB_FRAMESKIP_FIRST_FRAME_SKIPPED;
}
}
else {
gb->frame_skip_state = GB_FRAMESKIP_SECOND_FRAME_RENDERED;
display_vblank(gb);
}
}
/* Handle line 0 right after turning the LCD on */
else if (gb->first_scanline) {
/* OAM and VRAM blocking is not rushed in the very first scanline */
if (gb->display_cycles == atomic_increase) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->oam_read_blocked = false;
gb->vram_read_blocked = false;
gb->oam_write_blocked = false;
gb->vram_write_blocked = false;
}
else if (gb->display_cycles == MODE2_LENGTH) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 3;
gb->oam_read_blocked = true;
gb->vram_read_blocked = true;
gb->oam_write_blocked = true;
gb->vram_write_blocked = true;
}
else if (gb->display_cycles == MODE2_LENGTH + MODE3_LENGTH) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->oam_read_blocked = false;
gb->vram_read_blocked = false;
gb->oam_write_blocked = false;
gb->vram_write_blocked = false;
}
}
/* Handle STAT changes for lines 0-143 */
else if (gb->display_cycles < LINES * LINE_LENGTH) {
unsigned position_in_line = gb->display_cycles % LINE_LENGTH;
/* Handle OAM and VRAM blocking */
/* Todo: verify CGB timing for write blocking */
if (position_in_line == stat_delay - oam_blocking_rush ||
// In case stat_delay is 0
(position_in_line == LINE_LENGTH + stat_delay - oam_blocking_rush && gb->io_registers[GB_IO_LY] != 143)) {
gb->oam_read_blocked = true;
gb->oam_write_blocked = gb->is_cgb;
}
else if (position_in_line == MODE2_LENGTH + stat_delay - vram_blocking_rush) {
gb->vram_read_blocked = true;
gb->vram_write_blocked = gb->is_cgb;
}
if (position_in_line == stat_delay) {
gb->oam_write_blocked = true;
}
else if (!gb->is_cgb && position_in_line == MODE2_LENGTH + stat_delay - oam_blocking_rush) {
gb->oam_write_blocked = false;
}
else if (position_in_line == MODE2_LENGTH + stat_delay) {
gb->vram_write_blocked = true;
gb->oam_write_blocked = true;
}
/* Handle everything else */
if (position_in_line == stat_delay) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 2;
if (window_enabled(gb) && gb->display_cycles / LINE_LENGTH >= gb->io_registers[GB_IO_WY]) {
gb->current_window_line++;
}
}
else if (position_in_line == 0 && gb->display_cycles != 0) {
should_compare_ly = gb->is_cgb;
ly_for_comparison--;
}
else if (position_in_line == MODE2_LENGTH + stat_delay) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->io_registers[GB_IO_STAT] |= 3;
gb->effective_scx = gb->io_registers[GB_IO_SCX];
gb->previous_lcdc_x = - (gb->effective_scx & 0x7);
/* Todo: This works on both 007 - The World Is Not Enough and Donkey Kong 94, but should be verified better */
if (window_enabled(gb) && gb->display_cycles / LINE_LENGTH == gb->io_registers[GB_IO_WY] && gb->current_window_line == 0xFF) {
gb->current_window_line = 0;
}
}
else if (position_in_line == MODE2_LENGTH + MODE3_LENGTH + stat_delay + scx_delay) {
gb->io_registers[GB_IO_STAT] &= ~3;
gb->oam_read_blocked = false;
gb->vram_read_blocked = false;
gb->oam_write_blocked = false;
gb->vram_write_blocked = false;
if (gb->hdma_on_hblank) {
gb->hdma_on = true;
gb->hdma_cycles = 0;
}
}
}
/* Line 153 is special */
else if (gb->display_cycles >= (VIRTUAL_LINES - 1) * LINE_LENGTH) {
/* DMG */
if (!gb->is_cgb) {
switch (gb->display_cycles - (VIRTUAL_LINES - 1) * LINE_LENGTH) {
case 0:
should_compare_ly = false;
break;
case 4:
gb->io_registers[GB_IO_LY] = 0;
ly_for_comparison = VIRTUAL_LINES - 1;
break;
case 8:
gb->io_registers[GB_IO_LY] = 0;
should_compare_ly = false;
break;
default:
gb->io_registers[GB_IO_LY] = 0;
ly_for_comparison = 0;
}
}
/* CGB in DMG mode */
else if (!gb->cgb_mode) {
switch (gb->display_cycles - (VIRTUAL_LINES - 1) * LINE_LENGTH) {
case 0:
ly_for_comparison = VIRTUAL_LINES - 2;
break;
case 4:
break;
case 8:
gb->io_registers[GB_IO_LY] = 0;
break;
default:
gb->io_registers[GB_IO_LY] = 0;
ly_for_comparison = 0;
}
}
/* Single speed CGB */
else if (!gb->cgb_double_speed) {
switch (gb->display_cycles - (VIRTUAL_LINES - 1) * LINE_LENGTH) {
case 0:
break;
case 4:
gb->io_registers[GB_IO_LY] = 0;
break;
default:
gb->io_registers[GB_IO_LY] = 0;
ly_for_comparison = 0;
}
}
/* Double speed CGB */
else {
switch (gb->display_cycles - (VIRTUAL_LINES - 1) * LINE_LENGTH) {
case 0:
ly_for_comparison = VIRTUAL_LINES - 2;
break;
case 2:
case 4:
break;
case 6:
case 8:
gb->io_registers[GB_IO_LY] = 0;
break;
default:
gb->io_registers[GB_IO_LY] = 0;
ly_for_comparison = 0;
}
}
}
/* Lines 144 - 152 */
else {
if (stat_delay && gb->display_cycles % LINE_LENGTH == 0) {
should_compare_ly = gb->is_cgb;
ly_for_comparison--;
}
}
/* Set LY=LYC bit */
if (should_compare_ly && (ly_for_comparison == gb->io_registers[GB_IO_LYC])) {
gb->io_registers[GB_IO_STAT] |= 4;
}
else {
gb->io_registers[GB_IO_STAT] &= ~4;
}
if (!gb->stat_interrupt_line) {
switch (gb->io_registers[GB_IO_STAT] & 3) {
case 0: gb->stat_interrupt_line = gb->io_registers[GB_IO_STAT] & 8; break;
case 1: gb->stat_interrupt_line = gb->io_registers[GB_IO_STAT] & 0x10; break;
case 2: gb->stat_interrupt_line = gb->io_registers[GB_IO_STAT] & 0x20; break;
}
/* Use requested a LY=LYC interrupt and the LY=LYC bit is on */
if ((gb->io_registers[GB_IO_STAT] & 0x44) == 0x44) {
gb->stat_interrupt_line = true;
}
}
}
/* On the CGB, the last cycle of line 144 triggers an OAM interrupt
Todo: Verify timing for CGB in CGB mode and double speed CGB */
if (gb->is_cgb &&
gb->display_cycles == LINES * LINE_LENGTH + stat_delay - atomic_increase &&
(gb->io_registers[GB_IO_STAT] & 0x20)) {
gb->stat_interrupt_line = true;
}
if (gb->stat_interrupt_line && !previous_stat_interrupt_line) {
gb->io_registers[GB_IO_IF] |= 2;
}
/* The value of LY is glitched in the last cycle of every line in CGB mode CGB in single speed
This is based on GiiBiiAdvance's docs */
if (gb->cgb_mode && !gb->cgb_double_speed &&
gb->display_cycles % LINE_LENGTH == LINE_LENGTH - 4) {
uint8_t glitch_pattern[] = {0, 0, 2, 0, 4, 4, 6, 0, 8};
if ((gb->io_registers[GB_IO_LY] & 0xF) == 0xF) {
gb->io_registers[GB_IO_LY] = glitch_pattern[gb->io_registers[GB_IO_LY] >> 4] << 4;
}
else {
gb->io_registers[GB_IO_LY] = glitch_pattern[gb->io_registers[GB_IO_LY] & 7] | (gb->io_registers[GB_IO_LY] & 0xF8);
}
}
}
void GB_display_run(GB_gameboy_t *gb, uint8_t cycles)
{
update_display_state(gb, cycles);
if (gb->disable_rendering) {
return;
}
/*
Display controller bug: For some reason, the OAM STAT interrupt is called, as expected, for LY = 0..143.
However, it is also called from LY = 144.
See http://forums.nesdev.com/viewtopic.php?f=20&t=13727
*/
if (!(gb->io_registers[GB_IO_LCDC] & 0x80)) {
/* LCD is disabled, do nothing */
return;
}
if (gb->display_cycles >= LINE_LENGTH * 144) { /* VBlank */
return;
}
uint8_t effective_ly = gb->display_cycles / LINE_LENGTH;
if (gb->display_cycles % LINE_LENGTH < MODE2_LENGTH) { /* Mode 2 */
return;
}
/* Render */
/* Todo: it appears that the actual rendering starts 4 cycles after mode 3 starts. Is this correct? */
int16_t current_lcdc_x = gb->display_cycles % LINE_LENGTH - MODE2_LENGTH - (gb->effective_scx & 0x7) - 4;
for (;gb->previous_lcdc_x < current_lcdc_x; gb->previous_lcdc_x++) {
if (gb->previous_lcdc_x >= WIDTH) {
continue;
}
if (gb->previous_lcdc_x < 0) {
continue;
}
gb->screen[effective_ly * WIDTH + gb->previous_lcdc_x] =
get_pixel(gb, gb->previous_lcdc_x, effective_ly);
}
}
void GB_draw_tileset(GB_gameboy_t *gb, uint32_t *dest, GB_palette_type_t palette_type, uint8_t palette_index)
{
uint32_t none_palette[4];
uint32_t *palette = NULL;
switch (gb->is_cgb? palette_type : GB_PALETTE_NONE) {
default:
case GB_PALETTE_NONE:
none_palette[0] = gb->rgb_encode_callback(gb, 0xFF, 0xFF, 0xFF);
none_palette[1] = gb->rgb_encode_callback(gb, 0xAA, 0xAA, 0xAA);
none_palette[2] = gb->rgb_encode_callback(gb, 0x55, 0x55, 0x55);
none_palette[3] = gb->rgb_encode_callback(gb, 0, 0, 0 );
palette = none_palette;
break;
case GB_PALETTE_BACKGROUND:
palette = gb->background_palettes_rgb + (4 * (palette_index & 7));
break;
case GB_PALETTE_OAM:
palette = gb->sprite_palettes_rgb + (4 * (palette_index & 7));
break;
}
for (unsigned y = 0; y < 192; y++) {
for (unsigned x = 0; x < 256; x++) {
if (x >= 128 && !gb->is_cgb) {
*(dest++) = gb->background_palettes_rgb[0];
continue;
}
uint16_t tile = (x % 128) / 8 + y / 8 * 16;
uint16_t tile_address = tile * 0x10 + (x >= 128? 0x2000 : 0);
uint8_t pixel = (((gb->vram[tile_address + (y & 7) * 2 ] >> ((~x)&7)) & 1 ) |
((gb->vram[tile_address + (y & 7) * 2 + 1] >> ((~x)&7)) & 1) << 1);
if (!gb->cgb_mode) {
if (palette_type == GB_PALETTE_BACKGROUND) {
pixel = ((gb->io_registers[GB_IO_BGP] >> (pixel << 1)) & 3);
}
else if (!gb->cgb_mode) {
if (palette_type == GB_PALETTE_OAM) {
pixel = ((gb->io_registers[palette_index == 0? GB_IO_OBP0 : GB_IO_OBP1] >> (pixel << 1)) & 3);
}
}
}
*(dest++) = palette[pixel];
}
}
}
void GB_draw_tilemap(GB_gameboy_t *gb, uint32_t *dest, GB_palette_type_t palette_type, uint8_t palette_index, GB_map_type_t map_type, GB_tileset_type_t tileset_type)
{
uint32_t none_palette[4];
uint32_t *palette = NULL;
uint16_t map = 0x1800;
switch (gb->is_cgb? palette_type : GB_PALETTE_NONE) {
case GB_PALETTE_NONE:
none_palette[0] = gb->rgb_encode_callback(gb, 0xFF, 0xFF, 0xFF);
none_palette[1] = gb->rgb_encode_callback(gb, 0xAA, 0xAA, 0xAA);
none_palette[2] = gb->rgb_encode_callback(gb, 0x55, 0x55, 0x55);
none_palette[3] = gb->rgb_encode_callback(gb, 0, 0, 0 );
palette = none_palette;
break;
case GB_PALETTE_BACKGROUND:
palette = gb->background_palettes_rgb + (4 * (palette_index & 7));
break;
case GB_PALETTE_OAM:
palette = gb->sprite_palettes_rgb + (4 * (palette_index & 7));
break;
case GB_PALETTE_AUTO:
break;
}
if (map_type == GB_MAP_9C00 || (map_type == GB_MAP_AUTO && gb->io_registers[GB_IO_LCDC] & 0x08)) {
map = 0x1c00;
}
if (tileset_type == GB_TILESET_AUTO) {
tileset_type = (gb->io_registers[GB_IO_LCDC] & 0x10)? GB_TILESET_8800 : GB_TILESET_8000;
}
for (unsigned y = 0; y < 256; y++) {
for (unsigned x = 0; x < 256; x++) {
uint8_t tile = gb->vram[map + x/8 + y/8 * 32];
uint16_t tile_address;
uint8_t attributes = 0;
if (tileset_type == GB_TILESET_8800) {
tile_address = tile * 0x10;
}
else {
tile_address = (int8_t) tile * 0x10 + 0x1000;
}
if (gb->cgb_mode) {
attributes = gb->vram[map + x/8 + y/8 * 32 + 0x2000];
}
if (attributes & 0x8) {
tile_address += 0x2000;
}
uint8_t pixel = (((gb->vram[tile_address + (((attributes & 0x40)? ~y : y) & 7) * 2 ] >> (((attributes & 0x20)? x : ~x)&7)) & 1 ) |
((gb->vram[tile_address + (((attributes & 0x40)? ~y : y) & 7) * 2 + 1] >> (((attributes & 0x20)? x : ~x)&7)) & 1) << 1);
if (!gb->cgb_mode && (palette_type == GB_PALETTE_BACKGROUND || palette_type == GB_PALETTE_AUTO)) {
pixel = ((gb->io_registers[GB_IO_BGP] >> (pixel << 1)) & 3);
}
if (palette) {
*(dest++) = palette[pixel];
}
else {
*(dest++) = gb->background_palettes_rgb[(attributes & 7) * 4 + pixel];
}
}
}
}
uint8_t GB_get_oam_info(GB_gameboy_t *gb, GB_oam_info_t *dest, uint8_t *sprite_height)
{
uint8_t count = 0;
*sprite_height = (gb->io_registers[GB_IO_LCDC] & 4) ? 16:8;
uint8_t oam_to_dest_index[40] = {0,};
for (unsigned y = 0; y < LINES; y++) {
GB_sprite_t *sprite = (GB_sprite_t *) &gb->oam;
uint8_t sprites_in_line = 0;
for (uint8_t i = 0; i < 40; i++, sprite++) {
int sprite_y = sprite->y - 16;
bool obscured = false;
// Is sprite not in this line?
if (sprite_y > y || sprite_y + *sprite_height <= y) continue;
if (++sprites_in_line == 11) obscured = true;
GB_oam_info_t *info = NULL;
if (!oam_to_dest_index[i]) {
info = dest + count;
oam_to_dest_index[i] = ++count;
info->x = sprite->x;
info->y = sprite->y;
info->tile = *sprite_height == 16? sprite->tile & 0xFE : sprite->tile;
info->flags = sprite->flags;
info->obscured_by_line_limit = false;
info->oam_addr = 0xFE00 + i * sizeof(*sprite);
}
else {
info = dest + oam_to_dest_index[i] - 1;
}
info->obscured_by_line_limit |= obscured;
}
}
for (unsigned i = 0; i < count; i++) {
uint16_t vram_address = dest[i].tile * 0x10;
uint8_t flags = dest[i].flags;
uint8_t palette = gb->cgb_mode? (flags & 7) : ((flags & 0x10)? 1 : 0);
if (gb->is_cgb && (flags & 0x8)) {
vram_address += 0x2000;
}
for (unsigned y = 0; y < *sprite_height; y++) {
for (unsigned x = 0; x < 8; x++) {
uint8_t color = (((gb->vram[vram_address ] >> ((~x)&7)) & 1 ) |
((gb->vram[vram_address + 1] >> ((~x)&7)) & 1) << 1 );
if (!gb->cgb_mode) {
color = (gb->io_registers[palette? GB_IO_OBP1:GB_IO_OBP0] >> (color << 1)) & 3;
}
dest[i].image[((flags & 0x20)?7-x:x) + ((flags & 0x40)?*sprite_height - 1 -y:y) * 8] = gb->sprite_palettes_rgb[palette * 4 + color];
}
vram_address += 2;
}
}
return count;
}

40
waterbox/sameboy/display.h
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@ -1,40 +0,0 @@
#ifndef display_h
#define display_h
#include "gb.h"
#ifdef GB_INTERNAL
void GB_display_run(GB_gameboy_t *gb, uint8_t cycles);
void GB_palette_changed(GB_gameboy_t *gb, bool background_palette, uint8_t index);
#endif
typedef enum {
GB_PALETTE_NONE,
GB_PALETTE_BACKGROUND,
GB_PALETTE_OAM,
GB_PALETTE_AUTO,
} GB_palette_type_t;
typedef enum {
GB_MAP_AUTO,
GB_MAP_9800,
GB_MAP_9C00,
} GB_map_type_t;
typedef enum {
GB_TILESET_AUTO,
GB_TILESET_8800,
GB_TILESET_8000,
} GB_tileset_type_t;
typedef struct {
uint32_t image[128];
uint8_t x, y, tile, flags;
uint16_t oam_addr;
bool obscured_by_line_limit;
} GB_oam_info_t;
void GB_draw_tileset(GB_gameboy_t *gb, uint32_t *dest, GB_palette_type_t palette_type, uint8_t palette_index);
void GB_draw_tilemap(GB_gameboy_t *gb, uint32_t *dest, GB_palette_type_t palette_type, uint8_t palette_index, GB_map_type_t map_type, GB_tileset_type_t tileset_type);
uint8_t GB_get_oam_info(GB_gameboy_t *gb, GB_oam_info_t *dest, uint8_t *sprite_height);
#endif /* display_h */

473
waterbox/sameboy/gb.c
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@ -1,473 +0,0 @@
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <errno.h>
#include <stdarg.h>
#include "gb.h"
#include "../emulibc/emulibc.h"
void GB_attributed_logv(GB_gameboy_t *gb, GB_log_attributes attributes, const char *fmt, va_list args)
{
char *string = NULL;
vasprintf(&string, fmt, args);
if (string) {
if (gb->log_callback) {
gb->log_callback(gb, string, attributes);
}
else {
/* Todo: Add ANSI escape sequences for attributed text */
printf("%s", string);
}
}
free(string);
}
void GB_attributed_log(GB_gameboy_t *gb, GB_log_attributes attributes, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
GB_attributed_logv(gb, attributes, fmt, args);
va_end(args);
}
void GB_log(GB_gameboy_t *gb, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
GB_attributed_logv(gb, 0, fmt, args);
va_end(args);
}
void GB_init(GB_gameboy_t *gb)
{
memset(gb, 0, sizeof(*gb));
gb->ram = malloc(gb->ram_size = 0x2000);
gb->vram = malloc(gb->vram_size = 0x2000);
gb->cartridge_type = &GB_cart_defs[0]; // Default cartridge type
GB_reset(gb);
}
void GB_init_sgb(GB_gameboy_t *gb)
{
memset(gb, 0, sizeof(*gb));
gb->ram = malloc(gb->ram_size = 0x2000);
gb->vram = malloc(gb->vram_size = 0x2000);
gb->is_sgb = true;
gb->cartridge_type = &GB_cart_defs[0]; // Default cartridge type
GB_reset(gb);
}
void GB_init_cgb(GB_gameboy_t *gb)
{
memset(gb, 0, sizeof(*gb));
gb->ram = malloc(gb->ram_size = 0x2000 * 8);
gb->vram = malloc(gb->vram_size = 0x2000 * 2);
gb->is_cgb = true;
gb->cartridge_type = &GB_cart_defs[0]; // Default cartridge type
GB_reset(gb);
}
int GB_load_boot_rom(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "rb");
if (!f) {
GB_log(gb, "Could not open boot ROM: %s.\n", strerror(errno));
return errno;
}
fread(gb->boot_rom, sizeof(gb->boot_rom), 1, f);
fclose(f);
return 0;
}
int GB_load_rom(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "rb");
if (!f) {
GB_log(gb, "Could not open ROM: %s.\n", strerror(errno));
return errno;
}
fseek(f, 0, SEEK_END);
gb->rom_size = (ftell(f) + 0x3FFF) & ~0x3FFF; /* Round to bank */
/* And then round to a power of two */
while (gb->rom_size & (gb->rom_size - 1)) {
/* I promise this works. */
gb->rom_size |= gb->rom_size >> 1;
gb->rom_size++;
}
fseek(f, 0, SEEK_SET);
if (gb->rom) {
free(gb->rom);
}
gb->rom = alloc_sealed(gb->rom_size);
memset(gb->rom, 0xFF, gb->rom_size); /* Pad with 0xFFs */
fread(gb->rom, gb->rom_size, 1, f);
fclose(f);
GB_configure_cart(gb);
return 0;
}
int GB_save_battery(GB_gameboy_t *gb, const char *path)
{
if (!gb->cartridge_type->has_battery) return 0; // Nothing to save.
if (gb->mbc_ram_size == 0 && !gb->cartridge_type->has_rtc) return 0; /* Claims to have battery, but has no RAM or RTC */
FILE *f = fopen(path, "wb");
if (!f) {
GB_log(gb, "Could not open battery save: %s.\n", strerror(errno));
return errno;
}
if (fwrite(gb->mbc_ram, 1, gb->mbc_ram_size, f) != gb->mbc_ram_size) {
fclose(f);
return EIO;
}
if (gb->cartridge_type->has_rtc) {
if (fwrite(&gb->rtc_real, 1, sizeof(gb->rtc_real), f) != sizeof(gb->rtc_real)) {
fclose(f);
return EIO;
}
if (fwrite(&gb->last_rtc_second, 1, sizeof(gb->last_rtc_second), f) != sizeof(gb->last_rtc_second)) {
fclose(f);
return EIO;
}
}
errno = 0;
fclose(f);
return errno;
}
/* Loading will silently stop if the format is incomplete */
void GB_load_battery(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "rb");
if (!f) {
return;
}
if (fread(gb->mbc_ram, 1, gb->mbc_ram_size, f) != gb->mbc_ram_size) {
goto reset_rtc;
}
if (fread(&gb->rtc_real, 1, sizeof(gb->rtc_real), f) != sizeof(gb->rtc_real)) {
goto reset_rtc;
}
if (fread(&gb->last_rtc_second, 1, sizeof(gb->last_rtc_second), f) != sizeof(gb->last_rtc_second)) {
goto reset_rtc;
}
if (gb->last_rtc_second > time(NULL)) {
/* We must reset RTC here, or it will not advance. */
goto reset_rtc;
}
if (gb->last_rtc_second < 852076800) { /* 1/1/97. There weren't any RTC games that time,
so if the value we read is lower it means it wasn't
really RTC data. */
goto reset_rtc;
}
goto exit;
reset_rtc:
gb->last_rtc_second = time(NULL);
gb->rtc_real.high |= 0x80; /* This gives the game a hint that the clock should be reset. */
exit:
fclose(f);
return;
}
void GB_run(GB_gameboy_t *gb)
{
GB_cpu_run(gb);
if (gb->vblank_just_occured) {
GB_update_joyp(gb);
GB_rtc_run(gb);
}
}
uint64_t GB_run_cycles(GB_gameboy_t *gb, uint32_t cycles)
{
GB_update_joyp(gb);
GB_rtc_run(gb);
uint64_t start = gb->cycles_since_epoch;
uint64_t target = start + cycles;
while (gb->cycles_since_epoch < target) {
GB_run(gb);
}
return gb->cycles_since_epoch - start;
}
uint64_t GB_epoch(GB_gameboy_t *gb)
{
return gb->cycles_since_epoch;
}
void GB_set_pixels_output(GB_gameboy_t *gb, uint32_t *output)
{
gb->screen = output;
}
void GB_set_vblank_callback(GB_gameboy_t *gb, GB_vblank_callback_t callback)
{
gb->vblank_callback = callback;
}
void GB_set_log_callback(GB_gameboy_t *gb, GB_log_callback_t callback)
{
gb->log_callback = callback;
}
void GB_set_input_callback(GB_gameboy_t *gb, GB_input_callback_t callback)
{
gb->input_callback = callback;
}
void GB_set_rgb_encode_callback(GB_gameboy_t *gb, GB_rgb_encode_callback_t callback)
{
if (!gb->rgb_encode_callback && !gb->is_cgb) {
gb->sprite_palettes_rgb[4] = gb->sprite_palettes_rgb[0] = gb->background_palettes_rgb[0] =
callback(gb, 0xFF, 0xFF, 0xFF);
gb->sprite_palettes_rgb[5] = gb->sprite_palettes_rgb[1] = gb->background_palettes_rgb[1] =
callback(gb, 0xAA, 0xAA, 0xAA);
gb->sprite_palettes_rgb[6] = gb->sprite_palettes_rgb[2] = gb->background_palettes_rgb[2] =
callback(gb, 0x55, 0x55, 0x55);
gb->sprite_palettes_rgb[7] = gb->sprite_palettes_rgb[3] = gb->background_palettes_rgb[3] =
callback(gb, 0, 0, 0);
}
gb->rgb_encode_callback = callback;
}
void GB_set_infrared_callback(GB_gameboy_t *gb, GB_infrared_callback_t callback)
{
gb->infrared_callback = callback;
}
void GB_set_infrared_input(GB_gameboy_t *gb, bool state)
{
gb->infrared_input = state;
gb->cycles_since_input_ir_change = 0;
gb->ir_queue_length = 0;
}
void GB_queue_infrared_input(GB_gameboy_t *gb, bool state, long cycles_after_previous_change)
{
if (gb->ir_queue_length == GB_MAX_IR_QUEUE) {
GB_log(gb, "IR Queue is full\n");
return;
}
gb->ir_queue[gb->ir_queue_length++] = (GB_ir_queue_item_t){state, cycles_after_previous_change};
}
void GB_set_rumble_callback(GB_gameboy_t *gb, GB_rumble_callback_t callback)
{
gb->rumble_callback = callback;
}
void GB_set_sample_callback(GB_gameboy_t *gb, GB_sample_callback_t callback)
{
gb->sample_callback = callback;
}
void GB_set_serial_transfer_start_callback(GB_gameboy_t *gb, GB_serial_transfer_start_callback_t callback)
{
gb->serial_transfer_start_callback = callback;
}
void GB_set_serial_transfer_end_callback(GB_gameboy_t *gb, GB_serial_transfer_end_callback_t callback)
{
gb->serial_transfer_end_callback = callback;
}
uint8_t GB_serial_get_data(GB_gameboy_t *gb)
{
if (gb->io_registers[GB_IO_SC] & 1) {
/* Internal Clock */
GB_log(gb, "Serial read request while using internal clock. \n");
return 0xFF;
}
return gb->io_registers[GB_IO_SB];
}
void GB_serial_set_data(GB_gameboy_t *gb, uint8_t data)
{
if (gb->io_registers[GB_IO_SC] & 1) {
/* Internal Clock */
GB_log(gb, "Serial write request while using internal clock. \n");
return;
}
gb->io_registers[GB_IO_SB] = data;
gb->io_registers[GB_IO_IF] |= 8;
}
void GB_disconnect_serial(GB_gameboy_t *gb)
{
gb->serial_transfer_start_callback = NULL;
gb->serial_transfer_end_callback = NULL;
/* Reset any internally-emulated device. Currently, only the printer. */
memset(&gb->printer, 0, sizeof(gb->printer));
}
bool GB_is_inited(GB_gameboy_t *gb)
{
return gb->magic == 'SAME';
}
bool GB_is_cgb(GB_gameboy_t *gb)
{
return gb->is_cgb;
}
void GB_set_rendering_disabled(GB_gameboy_t *gb, bool disabled)
{
gb->disable_rendering = disabled;
}
void *GB_get_user_data(GB_gameboy_t *gb)
{
return gb->user_data;
}
void GB_set_user_data(GB_gameboy_t *gb, void *data)
{
gb->user_data = data;
}
void GB_reset(GB_gameboy_t *gb)
{
uint32_t mbc_ram_size = gb->mbc_ram_size;
bool cgb = gb->is_cgb;
// memset(gb, 0, (size_t)GB_GET_SECTION((GB_gameboy_t *) 0, unsaved));
gb->version = GB_STRUCT_VERSION;
gb->mbc_rom_bank = 1;
gb->last_rtc_second = time(NULL);
gb->cgb_ram_bank = 1;
gb->io_registers[GB_IO_JOYP] = 0xF;
gb->mbc_ram_size = mbc_ram_size;
if (cgb) {
gb->ram_size = 0x2000 * 8;
memset(gb->ram, 0, gb->ram_size);
gb->vram_size = 0x2000 * 2;
memset(gb->vram, 0, gb->vram_size);
gb->is_cgb = true;
gb->cgb_mode = true;
gb->io_registers[GB_IO_OBP0] = gb->io_registers[GB_IO_OBP1] = 0x00;
}
else {
gb->ram_size = 0x2000;
memset(gb->ram, 0, gb->ram_size);
gb->vram_size = 0x2000;
memset(gb->vram, 0, gb->vram_size);
if (gb->rgb_encode_callback) {
gb->sprite_palettes_rgb[4] = gb->sprite_palettes_rgb[0] = gb->background_palettes_rgb[0] =
gb->rgb_encode_callback(gb, 0xFF, 0xFF, 0xFF);
gb->sprite_palettes_rgb[5] = gb->sprite_palettes_rgb[1] = gb->background_palettes_rgb[1] =
gb->rgb_encode_callback(gb, 0xAA, 0xAA, 0xAA);
gb->sprite_palettes_rgb[6] = gb->sprite_palettes_rgb[2] = gb->background_palettes_rgb[2] =
gb->rgb_encode_callback(gb, 0x55, 0x55, 0x55);
gb->sprite_palettes_rgb[7] = gb->sprite_palettes_rgb[3] = gb->background_palettes_rgb[3] =
gb->rgb_encode_callback(gb, 0, 0, 0);
}
gb->io_registers[GB_IO_OBP0] = gb->io_registers[GB_IO_OBP1] = 0xFF;
}
/* The serial interrupt always occur on the 0xF8th cycle of every 0x100 cycle since boot. */
gb->serial_cycles = 0x100 - 0xF8;
gb->io_registers[GB_IO_SC] = 0x7E;
gb->magic = (uintptr_t)'SAME';
}
void GB_switch_model_and_reset(GB_gameboy_t *gb, bool is_cgb)
{
if (is_cgb) {
gb->ram = realloc(gb->ram, gb->ram_size = 0x2000 * 8);
gb->vram = realloc(gb->vram, gb->vram_size = 0x2000 * 2);
}
else {
gb->ram = realloc(gb->ram, gb->ram_size = 0x2000);
gb->vram = realloc(gb->vram, gb->vram_size = 0x2000);
}
gb->is_cgb = is_cgb;
GB_reset(gb);
}
void *GB_get_direct_access(GB_gameboy_t *gb, GB_direct_access_t access, size_t *size, uint16_t *bank)
{
/* Set size and bank to dummy pointers if not set */
size_t dummy_size;
uint16_t dummy_bank;
if (!size) {
size = &dummy_size;
}
if (!bank) {
bank = &dummy_bank;
}
switch (access) {
case GB_DIRECT_ACCESS_ROM:
*size = gb->rom_size;
*bank = gb->mbc_rom_bank;
return gb->rom;
case GB_DIRECT_ACCESS_RAM:
*size = gb->ram_size;
*bank = gb->cgb_ram_bank;
return gb->ram;
case GB_DIRECT_ACCESS_CART_RAM:
*size = gb->mbc_ram_size;
*bank = gb->mbc_ram_bank;
return gb->mbc_ram;
case GB_DIRECT_ACCESS_VRAM:
*size = gb->vram_size;
*bank = gb->cgb_vram_bank;
return gb->vram;
case GB_DIRECT_ACCESS_HRAM:
*size = sizeof(gb->hram);
*bank = 0;
return &gb->hram;
case GB_DIRECT_ACCESS_IO:
*size = sizeof(gb->io_registers);
*bank = 0;
return &gb->io_registers;
case GB_DIRECT_ACCESS_BOOTROM:
*size = gb->is_cgb? sizeof(gb->boot_rom) : 0x100;
*bank = 0;
return &gb->boot_rom;
case GB_DIRECT_ACCESS_OAM:
*size = sizeof(gb->oam);
*bank = 0;
return &gb->oam;
case GB_DIRECT_ACCESS_BGP:
*size = sizeof(gb->background_palettes_data);
*bank = 0;
return &gb->background_palettes_data;
case GB_DIRECT_ACCESS_OBP:
*size = sizeof(gb->sprite_palettes_data);
*bank = 0;
return &gb->sprite_palettes_data;
default:
*size = 0;
*bank = 0;
return NULL;
}
}
void GB_set_lagged(GB_gameboy_t *gb, bool lagged)
{
gb->lagged = lagged;
}
bool GB_get_lagged(GB_gameboy_t *gb)
{
return gb->lagged;
}

523
waterbox/sameboy/gb.h
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@ -1,523 +0,0 @@
#ifndef GB_h
#define GB_h
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include "gb_struct_def.h"
#include "apu.h"
#include "camera.h"
#include "display.h"
#include "joypad.h"
#include "mbc.h"
#include "memory.h"
#include "printer.h"
#include "timing.h"
#include "z80_cpu.h"
#define GB_STRUCT_VERSION 11
enum {
GB_REGISTER_AF,
GB_REGISTER_BC,
GB_REGISTER_DE,
GB_REGISTER_HL,
GB_REGISTER_SP,
GB_REGISTERS_16_BIT /* Count */
};
/* Todo: Actually use these! */
enum {
GB_CARRY_FLAG = 16,
GB_HALF_CARRY_FLAG = 32,
GB_SUBSTRACT_FLAG = 64,
GB_ZERO_FLAG = 128,
};
#define GB_MAX_IR_QUEUE 256
enum {
/* Joypad and Serial */
GB_IO_JOYP = 0x00, // Joypad (R/W)
GB_IO_SB = 0x01, // Serial transfer data (R/W)
GB_IO_SC = 0x02, // Serial Transfer Control (R/W)
/* Missing */
/* Timers */
GB_IO_DIV = 0x04, // Divider Register (R/W)
GB_IO_TIMA = 0x05, // Timer counter (R/W)
GB_IO_TMA = 0x06, // Timer Modulo (R/W)
GB_IO_TAC = 0x07, // Timer Control (R/W)
/* Missing */
GB_IO_IF = 0x0f, // Interrupt Flag (R/W)
/* Sound */
GB_IO_NR10 = 0x10, // Channel 1 Sweep register (R/W)
GB_IO_NR11 = 0x11, // Channel 1 Sound length/Wave pattern duty (R/W)
GB_IO_NR12 = 0x12, // Channel 1 Volume Envelope (R/W)
GB_IO_NR13 = 0x13, // Channel 1 Frequency lo (Write Only)
GB_IO_NR14 = 0x14, // Channel 1 Frequency hi (R/W)
GB_IO_NR21 = 0x16, // Channel 2 Sound Length/Wave Pattern Duty (R/W)
GB_IO_NR22 = 0x17, // Channel 2 Volume Envelope (R/W)
GB_IO_NR23 = 0x18, // Channel 2 Frequency lo data (W)
GB_IO_NR24 = 0x19, // Channel 2 Frequency hi data (R/W)
GB_IO_NR30 = 0x1a, // Channel 3 Sound on/off (R/W)
GB_IO_NR31 = 0x1b, // Channel 3 Sound Length
GB_IO_NR32 = 0x1c, // Channel 3 Select output level (R/W)
GB_IO_NR33 = 0x1d, // Channel 3 Frequency's lower data (W)
GB_IO_NR34 = 0x1e, // Channel 3 Frequency's higher data (R/W)
/* Missing */
GB_IO_NR41 = 0x20, // Channel 4 Sound Length (R/W)
GB_IO_NR42 = 0x21, // Channel 4 Volume Envelope (R/W)
GB_IO_NR43 = 0x22, // Channel 4 Polynomial Counter (R/W)
GB_IO_NR44 = 0x23, // Channel 4 Counter/consecutive, Inital (R/W)
GB_IO_NR50 = 0x24, // Channel control / ON-OFF / Volume (R/W)
GB_IO_NR51 = 0x25, // Selection of Sound output terminal (R/W)
GB_IO_NR52 = 0x26, // Sound on/off
/* Missing */
GB_IO_WAV_START = 0x30, // Wave pattern start
GB_IO_WAV_END = 0x3f, // Wave pattern end
/* Graphics */
GB_IO_LCDC = 0x40, // LCD Control (R/W)
GB_IO_STAT = 0x41, // LCDC Status (R/W)
GB_IO_SCY = 0x42, // Scroll Y (R/W)
GB_IO_SCX = 0x43, // Scroll X (R/W)
GB_IO_LY = 0x44, // LCDC Y-Coordinate (R)
GB_IO_LYC = 0x45, // LY Compare (R/W)
GB_IO_DMA = 0x46, // DMA Transfer and Start Address (W)
GB_IO_BGP = 0x47, // BG Palette Data (R/W) - Non CGB Mode Only
GB_IO_OBP0 = 0x48, // Object Palette 0 Data (R/W) - Non CGB Mode Only
GB_IO_OBP1 = 0x49, // Object Palette 1 Data (R/W) - Non CGB Mode Only
GB_IO_WY = 0x4a, // Window Y Position (R/W)
GB_IO_WX = 0x4b, // Window X Position minus 7 (R/W)
// Has some undocumented compatibility flags written at boot.
// Unfortunately it is not readable or writable after boot has finished, so research of this
// register is quite limited. The value written to this register, however, can be controlled
// in some cases.
GB_IO_DMG_EMULATION = 0x4c,
/* General CGB features */
GB_IO_KEY1 = 0x4d, // CGB Mode Only - Prepare Speed Switch
/* Missing */
GB_IO_VBK = 0x4f, // CGB Mode Only - VRAM Bank
GB_IO_BIOS = 0x50, // Write to disable the BIOS mapping
/* CGB DMA */
GB_IO_HDMA1 = 0x51, // CGB Mode Only - New DMA Source, High
GB_IO_HDMA2 = 0x52, // CGB Mode Only - New DMA Source, Low
GB_IO_HDMA3 = 0x53, // CGB Mode Only - New DMA Destination, High
GB_IO_HDMA4 = 0x54, // CGB Mode Only - New DMA Destination, Low
GB_IO_HDMA5 = 0x55, // CGB Mode Only - New DMA Length/Mode/Start
/* IR */
GB_IO_RP = 0x56, // CGB Mode Only - Infrared Communications Port
/* Missing */
/* CGB Paletts */
GB_IO_BGPI = 0x68, // CGB Mode Only - Background Palette Index
GB_IO_BGPD = 0x69, // CGB Mode Only - Background Palette Data
GB_IO_OBPI = 0x6a, // CGB Mode Only - Sprite Palette Index
GB_IO_OBPD = 0x6b, // CGB Mode Only - Sprite Palette Data
// 1 is written for DMG ROMs on a CGB. Does not appear to have an effect.
GB_IO_DMG_EMULATION_INDICATION = 0x6c, // (FEh) Bit 0 (Read/Write)
/* Missing */
GB_IO_SVBK = 0x70, // CGB Mode Only - WRAM Bank
GB_IO_UNKNOWN2 = 0x72, // (00h) - Bit 0-7 (Read/Write)
GB_IO_UNKNOWN3 = 0x73, // (00h) - Bit 0-7 (Read/Write)
GB_IO_UNKNOWN4 = 0x74, // (00h) - Bit 0-7 (Read/Write) - CGB Mode Only
GB_IO_UNKNOWN5 = 0x75, // (8Fh) - Bit 4-6 (Read/Write)
GB_IO_PCM_12 = 0x76, // Channels 1 and 2 amplitudes
GB_IO_PCM_34 = 0x77, // Channels 3 and 4 amplitudes
GB_IO_UNKNOWN8 = 0x7F, // Unknown, write only
};
typedef enum {
GB_LOG_BOLD = 1,
GB_LOG_DASHED_UNDERLINE = 2,
GB_LOG_UNDERLINE = 4,
GB_LOG_UNDERLINE_MASK = GB_LOG_DASHED_UNDERLINE | GB_LOG_UNDERLINE
} GB_log_attributes;
#ifdef GB_INTERNAL
#define LCDC_PERIOD 70224
#define CPU_FREQUENCY 0x400000
#define DIV_CYCLES (0x100)
#define INTERNAL_DIV_CYCLES (0x40000)
#define FRAME_LENGTH 16742706 // in nanoseconds
#endif
typedef void (*GB_vblank_callback_t)(GB_gameboy_t *gb);
typedef void (*GB_log_callback_t)(GB_gameboy_t *gb, const char *string, GB_log_attributes attributes);
typedef void (*GB_input_callback_t)(GB_gameboy_t *gb);
typedef uint32_t (*GB_rgb_encode_callback_t)(GB_gameboy_t *gb, uint8_t r, uint8_t g, uint8_t b);
typedef void (*GB_infrared_callback_t)(GB_gameboy_t *gb, bool on, long cycles_since_last_update);
typedef void (*GB_rumble_callback_t)(GB_gameboy_t *gb, bool rumble_on);
typedef void (*GB_serial_transfer_start_callback_t)(GB_gameboy_t *gb, uint8_t byte_to_send);
typedef uint8_t (*GB_serial_transfer_end_callback_t)(GB_gameboy_t *gb);
typedef void (*GB_sample_callback_t)(GB_gameboy_t *gb, GB_sample_t sample, uint64_t clock);
typedef void (*GB_scanline_callback_t)(uint8_t lcdc);
typedef struct {
bool state;
long delay;
} GB_ir_queue_item_t;
/* When state saving, each section is dumped independently of other sections.
This allows adding data to the end of the section without worrying about future compatibility.
Some other changes might be "safe" as well.
This struct is not packed, but dumped sections exclusively use types that have the same alignment in both 32 and 64
bit platforms. */
/* We make sure bool is 1 for cross-platform save state compatibility. */
/* Todo: We might want to typedef our own bool if this prevents SameBoy from working on specific platforms. */
_Static_assert(sizeof(bool) == 1, "sizeof(bool) != 1");
#ifdef GB_INTERNAL
struct GB_gameboy_s {
#else
struct GB_gameboy_internal_s {
#endif
/* The magic makes sure a state file is:
- Indeed a SameBoy state file.
- Has the same endianess has the current platform. */
volatile uint32_t magic;
/* The version field makes sure we don't load save state files with a completely different structure.
This happens when struct fields are removed/resized in an backward incompatible manner. */
uint32_t version;
/* Registers */
uint16_t pc;
union {
uint16_t registers[GB_REGISTERS_16_BIT];
struct {
uint16_t af,
bc,
de,
hl,
sp;
};
struct {
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
uint8_t a, f,
b, c,
d, e,
h, l;
#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
uint8_t f, a,
c, b,
e, d,
l, h;
#else
#error Unable to detect endianess
#endif
};
};
uint8_t ime;
uint8_t interrupt_enable;
uint8_t cgb_ram_bank;
/* CPU and General Hardware Flags*/
bool is_sgb;
bool cgb_mode;
bool is_cgb;
bool cgb_double_speed;
bool halted;
bool stopped;
bool boot_rom_finished;
bool ime_toggle; /* ei (and di in CGB) have delayed effects.*/
bool halt_bug;
/* Misc state */
bool infrared_input;
GB_printer_t printer;
/* DMA and HDMA */
bool hdma_on;
bool hdma_on_hblank;
uint8_t hdma_steps_left;
uint16_t hdma_cycles;
uint16_t hdma_current_src, hdma_current_dest;
uint8_t dma_steps_left;
uint8_t dma_current_dest;
uint16_t dma_current_src;
int16_t dma_cycles;
bool is_dma_restarting;
/* MBC */
uint16_t mbc_rom_bank;
uint8_t mbc_ram_bank;
uint32_t mbc_ram_size;
bool mbc_ram_enable;
union {
struct {
uint8_t bank_low:5;
uint8_t bank_high:2;
uint8_t padding:1; // Save state compatibility with 0.9
uint8_t mode:1;
} mbc1;
struct {
uint8_t rom_bank:4;
} mbc2;
struct {
uint8_t rom_bank:7;
uint8_t padding:1;
uint8_t ram_bank:4;
} mbc3;
struct {
uint8_t rom_bank_low;
uint8_t rom_bank_high:1;
uint8_t ram_bank:4;
} mbc5;
struct {
uint8_t bank_low:6;
uint8_t bank_high:3;
uint8_t mode:1;
} huc1;
struct {
uint8_t rom_bank;
uint8_t ram_bank;
} huc3;
};
uint16_t mbc_rom0_bank; /* For some MBC1 wirings. */
bool camera_registers_mapped;
uint8_t camera_registers[0x36];
bool rumble_state;
/* HRAM and HW Registers */
uint8_t hram[0xFFFF - 0xFF80];
uint8_t io_registers[0x80];
/* Timing */
uint32_t display_cycles;
uint32_t div_cycles;
uint8_t tima_reload_state; /* After TIMA overflows, it becomes 0 for 4 cycles before actually reloading. */
uint16_t serial_cycles; /* This field changed its meaning in v0.10 */
uint16_t serial_length;
/* APU */
GB_apu_t apu;
/* RTC */
union {
struct {
uint8_t seconds;
uint8_t minutes;
uint8_t hours;
uint8_t days;
uint8_t high;
};
uint8_t data[5];
} rtc_real, rtc_latched;
time_t last_rtc_second;
bool rtc_latch;
/* Video Display */
uint32_t vram_size; // Different between CGB and DMG
uint8_t cgb_vram_bank;
uint8_t oam[0xA0];
uint8_t background_palettes_data[0x40];
uint8_t sprite_palettes_data[0x40];
uint32_t background_palettes_rgb[0x20];
uint32_t sprite_palettes_rgb[0x20];
int16_t previous_lcdc_x;
bool stat_interrupt_line;
uint8_t effective_scx;
uint8_t current_window_line;
/* The LCDC will skip the first frame it renders after turning it on.
On the CGB, a frame is not skipped if the previous frame was skipped as well.
See https://www.reddit.com/r/EmuDev/comments/6exyxu/ */
enum {
GB_FRAMESKIP_LCD_TURNED_ON, // On a DMG, the LCD renders a blank screen during this state,
// on a CGB, the previous frame is repeated (which might be
// blank if the LCD was off for more than a few cycles)
GB_FRAMESKIP_FIRST_FRAME_SKIPPED, // This state is 'skipped' when emulating a DMG
GB_FRAMESKIP_SECOND_FRAME_RENDERED,
} frame_skip_state;
bool first_scanline; // The very first scan line after turning the LCD behaves differently.
bool oam_read_blocked;
bool vram_read_blocked;
bool oam_write_blocked;
bool vram_write_blocked;
/* Unsaved data. This includes all pointers, as well as everything that shouldn't be on a save state */
/* This data is reserved on reset and must come last in the struct */
/* ROM */
uint8_t *rom;
uint32_t rom_size;
const GB_cartridge_t *cartridge_type;
enum {
GB_STANDARD_MBC1_WIRING,
GB_MBC1M_WIRING,
} mbc1_wiring;
/* Various RAMs */
uint8_t *ram;
uint8_t *vram;
uint8_t *mbc_ram;
/* I/O */
uint32_t *screen;
int keys;
bool lagged;
/* Timing */
uint64_t cycles_since_epoch;
/* Callbacks */
void *user_data;
GB_log_callback_t log_callback;
GB_input_callback_t input_callback;
GB_rgb_encode_callback_t rgb_encode_callback;
GB_vblank_callback_t vblank_callback;
GB_infrared_callback_t infrared_callback;
GB_camera_get_pixel_callback_t camera_get_pixel_callback;
GB_camera_update_request_callback_t camera_update_request_callback;
GB_rumble_callback_t rumble_callback;
GB_serial_transfer_start_callback_t serial_transfer_start_callback;
GB_serial_transfer_end_callback_t serial_transfer_end_callback;
GB_sample_callback_t sample_callback;
GB_scanline_callback_t scanline_callback;
int scanline_callback_ly;
/* IR */
long cycles_since_ir_change;
long cycles_since_input_ir_change;
GB_ir_queue_item_t ir_queue[GB_MAX_IR_QUEUE];
size_t ir_queue_length;
/* Breakpoints */
uint16_t n_breakpoints;
struct GB_breakpoint_s *breakpoints;
/* SLD (Todo: merge with backtrace) */
bool stack_leak_detection;
int debug_call_depth;
uint16_t sp_for_call_depth[0x200]; /* Should be much more than enough */
uint16_t addr_for_call_depth[0x200];
/* Backtrace */
unsigned int backtrace_size;
uint16_t backtrace_sps[0x200];
struct {
uint16_t bank;
uint16_t addr;
} backtrace_returns[0x200];
/* Misc */
bool disable_rendering;
uint32_t ram_size; // Different between CGB and DMG
uint8_t boot_rom[0x900];
bool vblank_just_occured; // For slow operations involving syscalls; these should only run once per vblank
int64_t frontend_rtc_time;
};
#ifndef GB_INTERNAL
struct GB_gameboy_s {
char __internal[sizeof(struct GB_gameboy_internal_s)];
};
#endif
#ifndef __printflike
/* Missing from Linux headers. */
#define __printflike(fmtarg, firstvararg) \
__attribute__((__format__ (__printf__, fmtarg, firstvararg)))
#endif
void GB_init(GB_gameboy_t *gb);
void GB_init_sgb(GB_gameboy_t *gb);
void GB_init_cgb(GB_gameboy_t *gb);
bool GB_is_inited(GB_gameboy_t *gb);
bool GB_is_cgb(GB_gameboy_t *gb);
void GB_free(GB_gameboy_t *gb);
void GB_reset(GB_gameboy_t *gb);
void GB_switch_model_and_reset(GB_gameboy_t *gb, bool is_cgb);
void GB_run(GB_gameboy_t *gb);
uint64_t GB_run_cycles(GB_gameboy_t *gb, uint32_t cycles);
uint64_t GB_epoch(GB_gameboy_t *gb);
typedef enum {
GB_DIRECT_ACCESS_ROM,
GB_DIRECT_ACCESS_RAM,
GB_DIRECT_ACCESS_CART_RAM,
GB_DIRECT_ACCESS_VRAM,
GB_DIRECT_ACCESS_HRAM,
GB_DIRECT_ACCESS_IO, /* Warning: Some registers can only be read/written correctly via GB_memory_read/write. */
GB_DIRECT_ACCESS_BOOTROM,
GB_DIRECT_ACCESS_OAM,
GB_DIRECT_ACCESS_BGP,
GB_DIRECT_ACCESS_OBP,
} GB_direct_access_t;
/* Returns a mutable pointer to various hardware memories. If that memory is banked, the current bank
is returned at *bank, even if only a portion of the memory is banked. */
void *GB_get_direct_access(GB_gameboy_t *gb, GB_direct_access_t access, size_t *size, uint16_t *bank);
void *GB_get_user_data(GB_gameboy_t *gb);
void GB_set_user_data(GB_gameboy_t *gb, void *data);
int GB_load_boot_rom(GB_gameboy_t *gb, const char *path);
int GB_load_rom(GB_gameboy_t *gb, const char *path);
int GB_save_battery(GB_gameboy_t *gb, const char *path);
void GB_load_battery(GB_gameboy_t *gb, const char *path);
void GB_set_rendering_disabled(GB_gameboy_t *gb, bool disabled);
void GB_log(GB_gameboy_t *gb, const char *fmt, ...) __printflike(2, 3);
void GB_attributed_log(GB_gameboy_t *gb, GB_log_attributes attributes, const char *fmt, ...) __printflike(3, 4);
void GB_set_pixels_output(GB_gameboy_t *gb, uint32_t *output);
void GB_set_infrared_input(GB_gameboy_t *gb, bool state);
void GB_queue_infrared_input(GB_gameboy_t *gb, bool state, long cycles_after_previous_change);
void GB_set_vblank_callback(GB_gameboy_t *gb, GB_vblank_callback_t callback);
void GB_set_log_callback(GB_gameboy_t *gb, GB_log_callback_t callback);
void GB_set_input_callback(GB_gameboy_t *gb, GB_input_callback_t callback);
void GB_set_rgb_encode_callback(GB_gameboy_t *gb, GB_rgb_encode_callback_t callback);
void GB_set_infrared_callback(GB_gameboy_t *gb, GB_infrared_callback_t callback);
void GB_set_rumble_callback(GB_gameboy_t *gb, GB_rumble_callback_t callback);
void GB_set_sample_callback(GB_gameboy_t *gb, GB_sample_callback_t callback);
/* These APIs are used when using internal clock */
void GB_set_serial_transfer_start_callback(GB_gameboy_t *gb, GB_serial_transfer_start_callback_t callback);
void GB_set_serial_transfer_end_callback(GB_gameboy_t *gb, GB_serial_transfer_end_callback_t callback);
/* These APIs are used when using external clock */
uint8_t GB_serial_get_data(GB_gameboy_t *gb);
void GB_serial_set_data(GB_gameboy_t *gb, uint8_t data);
void GB_disconnect_serial(GB_gameboy_t *gb);
void GB_set_lagged(GB_gameboy_t *gb, bool lagged);
bool GB_get_lagged(GB_gameboy_t *gb);
#endif /* GB_h */

5
waterbox/sameboy/gb_struct_def.h
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@ -1,5 +0,0 @@
#ifndef gb_struct_def_h
#define gb_struct_def_h
struct GB_gameboy_s;
typedef struct GB_gameboy_s GB_gameboy_t;
#endif

48
waterbox/sameboy/joypad.c
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@ -1,48 +0,0 @@
#include <stdio.h>
#include "gb.h"
#include <assert.h>
void GB_update_joyp(GB_gameboy_t *gb)
{
uint8_t key_selection = 0;
uint8_t previous_state = 0;
/* Todo: add delay to key selection */
previous_state = gb->io_registers[GB_IO_JOYP] & 0xF;
key_selection = gb->io_registers[GB_IO_JOYP] >> 4 & 3;
gb->io_registers[GB_IO_JOYP] &= 0xF0;
switch (key_selection) {
case 3:
/* Nothing is wired, all up */
gb->io_registers[GB_IO_JOYP] |= 0x0F;
break;
case 2:
/* Direction keys */
gb->io_registers[GB_IO_JOYP] |= ~gb->keys >> 4 & 0xf;
break;
case 1:
/* Other keys */
gb->io_registers[GB_IO_JOYP] |= ~gb->keys & 0xf;
break;
case 0:
/* Todo: verifiy this is correct */
gb->io_registers[GB_IO_JOYP] |= ~(gb->keys >> 4 & gb->keys) & 0xf;
break;
default:
break;
}
if (previous_state != (gb->io_registers[GB_IO_JOYP] & 0xF)) {
/* Todo: disable when emulating CGB */
gb->io_registers[GB_IO_IF] |= 0x10;
}
gb->io_registers[GB_IO_JOYP] |= 0xC0; // No SGB support
}
void GB_set_key_state(GB_gameboy_t *gb, int keys)
{
gb->keys = keys;
}

10
waterbox/sameboy/joypad.h
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@ -1,10 +0,0 @@
#ifndef joypad_h
#define joypad_h
#include "gb_struct_def.h"
void GB_set_key_state(GB_gameboy_t *gb, int keys);
#ifdef GB_INTERNAL
void GB_update_joyp(GB_gameboy_t *gb);
#endif
#endif /* joypad_h */

154
waterbox/sameboy/mbc.c
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#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include "gb.h"
const GB_cartridge_t GB_cart_defs[256] = {
// From http://gbdev.gg8.se/wiki/articles/The_Cartridge_Header#0147_-_Cartridge_Type
/* MBC SUBTYPE RAM BAT. RTC RUMB. */
{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // 00h ROM ONLY
{ GB_MBC1 , GB_STANDARD_MBC, false, false, false, false}, // 01h MBC1
{ GB_MBC1 , GB_STANDARD_MBC, true , false, false, false}, // 02h MBC1+RAM
{ GB_MBC1 , GB_STANDARD_MBC, true , true , false, false}, // 03h MBC1+RAM+BATTERY
[5] =
{ GB_MBC2 , GB_STANDARD_MBC, true , false, false, false}, // 05h MBC2
{ GB_MBC2 , GB_STANDARD_MBC, true , true , false, false}, // 06h MBC2+BATTERY
[8] =
{ GB_NO_MBC, GB_STANDARD_MBC, true , false, false, false}, // 08h ROM+RAM
{ GB_NO_MBC, GB_STANDARD_MBC, true , true , false, false}, // 09h ROM+RAM+BATTERY
[0xB] =
/* Todo: Not supported yet */
{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // 0Bh MMM01
{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // 0Ch MMM01+RAM
{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // 0Dh MMM01+RAM+BATTERY
[0xF] =
{ GB_MBC3 , GB_STANDARD_MBC, false, true, true , false}, // 0Fh MBC3+TIMER+BATTERY
{ GB_MBC3 , GB_STANDARD_MBC, true , true, true , false}, // 10h MBC3+TIMER+RAM+BATTERY
{ GB_MBC3 , GB_STANDARD_MBC, false, false, false, false}, // 11h MBC3
{ GB_MBC3 , GB_STANDARD_MBC, true , false, false, false}, // 12h MBC3+RAM
{ GB_MBC3 , GB_STANDARD_MBC, true , true , false, false}, // 13h MBC3+RAM+BATTERY
[0x19] =
{ GB_MBC5 , GB_STANDARD_MBC, false, false, false, false}, // 19h MBC5
{ GB_MBC5 , GB_STANDARD_MBC, true , false, false, false}, // 1Ah MBC5+RAM
{ GB_MBC5 , GB_STANDARD_MBC, true , true , false, false}, // 1Bh MBC5+RAM+BATTERY
{ GB_MBC5 , GB_STANDARD_MBC, false, false, false, true }, // 1Ch MBC5+RUMBLE
{ GB_MBC5 , GB_STANDARD_MBC, true , false, false, true }, // 1Dh MBC5+RUMBLE+RAM
{ GB_MBC5 , GB_STANDARD_MBC, true , true , false, true }, // 1Eh MBC5+RUMBLE+RAM+BATTERY
[0xFC] =
{ GB_MBC5 , GB_CAMERA , true , true , false, false}, // FCh POCKET CAMERA
{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // FDh BANDAI TAMA5 (Todo: Not supported)
{ GB_HUC3 , GB_STANDARD_MBC, true , true , false, false}, // FEh HuC3 (Todo: Mapper support only)
{ GB_HUC1 , GB_STANDARD_MBC, true , true , false, false}, // FFh HuC1+RAM+BATTERY (Todo: No IR bindings)
};
void GB_update_mbc_mappings(GB_gameboy_t *gb)
{
switch (gb->cartridge_type->mbc_type) {
case GB_NO_MBC: return;
case GB_MBC1:
switch (gb->mbc1_wiring) {
case GB_STANDARD_MBC1_WIRING:
gb->mbc_rom_bank = gb->mbc1.bank_low | (gb->mbc1.bank_high << 5);
if (gb->mbc1.mode == 0) {
gb->mbc_ram_bank = 0;
gb->mbc_rom0_bank = 0;
}
else {
gb->mbc_ram_bank = gb->mbc1.bank_high;
gb->mbc_rom0_bank = gb->mbc1.bank_high << 5;
}
if ((gb->mbc_rom_bank & 0x1F) == 0) {
gb->mbc_rom_bank++;
}
break;
case GB_MBC1M_WIRING:
gb->mbc_rom_bank = (gb->mbc1.bank_low & 0xF) | (gb->mbc1.bank_high << 4);
if (gb->mbc1.mode == 0) {
gb->mbc_ram_bank = 0;
gb->mbc_rom0_bank = 0;
}
else {
gb->mbc_rom0_bank = gb->mbc1.bank_high << 4;
gb->mbc_ram_bank = 0;
}
if ((gb->mbc1.bank_low & 0x1F) == 0) {
gb->mbc_rom_bank++;
}
break;
}
break;
case GB_MBC2:
gb->mbc_rom_bank = gb->mbc2.rom_bank;
if ((gb->mbc_rom_bank & 0xF) == 0) {
gb->mbc_rom_bank = 1;
}
break;
case GB_MBC3:
gb->mbc_rom_bank = gb->mbc3.rom_bank;
gb->mbc_ram_bank = gb->mbc3.ram_bank;
if (gb->mbc_rom_bank == 0) {
gb->mbc_rom_bank = 1;
}
break;
case GB_MBC5:
gb->mbc_rom_bank = gb->mbc5.rom_bank_low | (gb->mbc5.rom_bank_high << 8);
gb->mbc_ram_bank = gb->mbc5.ram_bank;
break;
case GB_HUC1:
if (gb->huc1.mode == 0) {
gb->mbc_rom_bank = gb->huc1.bank_low | (gb->mbc1.bank_high << 6);
gb->mbc_ram_bank = 0;
}
else {
gb->mbc_rom_bank = gb->huc1.bank_low;
gb->mbc_ram_bank = gb->huc1.bank_high;
}
break;
case GB_HUC3:
gb->mbc_rom_bank = gb->huc3.rom_bank;
gb->mbc_ram_bank = gb->huc3.ram_bank;
break;
}
}
void GB_configure_cart(GB_gameboy_t *gb)
{
gb->cartridge_type = &GB_cart_defs[gb->rom[0x147]];
if (gb->rom[0x147] == 0 && gb->rom_size > 0x8000) {
GB_log(gb, "ROM header reports no MBC, but file size is over 32Kb. Assuming cartridge uses MBC3.\n");
gb->cartridge_type = &GB_cart_defs[0x11];
}
else if (gb->rom[0x147] != 0 && memcmp(gb->cartridge_type, &GB_cart_defs[0], sizeof(GB_cart_defs[0])) == 0) {
GB_log(gb, "Cartridge type %02x is not yet supported.\n", gb->rom[0x147]);
}
if (gb->cartridge_type->has_ram) {
if (gb->cartridge_type->mbc_type == GB_MBC2) {
gb->mbc_ram_size = 0x200;
}
else {
static const int ram_sizes[256] = {0, 0x800, 0x2000, 0x8000, 0x20000, 0x10000};
gb->mbc_ram_size = ram_sizes[gb->rom[0x149]];
}
gb->mbc_ram = malloc(gb->mbc_ram_size);
/* Todo: Some games assume unintialized MBC RAM is 0xFF. It this true for all cartridges types? */
memset(gb->mbc_ram, 0xFF, gb->mbc_ram_size);
}
/* MBC1 has at least 3 types of wiring (We currently support two (Standard and 4bit-MBC1M) of these).
See http://forums.nesdev.com/viewtopic.php?f=20&t=14099 */
/* Attempt to "guess" wiring */
if (gb->cartridge_type->mbc_type == GB_MBC1) {
if (gb->rom_size >= 0x44000 && memcmp(gb->rom + 0x104, gb->rom + 0x40104, 0x30) == 0) {
gb->mbc1_wiring = GB_MBC1M_WIRING;
}
}
/* Set MBC5's bank to 1 correctly */
if (gb->cartridge_type->mbc_type == GB_MBC5) {
gb->mbc5.rom_bank_low = 1;
}
}

31
waterbox/sameboy/mbc.h
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@ -1,31 +0,0 @@
#ifndef MBC_h
#define MBC_h
#include "gb_struct_def.h"
typedef struct {
enum {
GB_NO_MBC,
GB_MBC1,
GB_MBC2,
GB_MBC3,
GB_MBC5,
GB_HUC1, /* Todo: HUC1 features are not emulated. Should be unified with the CGB IR sensor API. */
GB_HUC3,
} mbc_type;
enum {
GB_STANDARD_MBC,
GB_CAMERA,
} mbc_subtype;
bool has_ram;
bool has_battery;
bool has_rtc;
bool has_rumble;
} GB_cartridge_t;
#ifdef GB_INTERNAL
extern const GB_cartridge_t GB_cart_defs[256];
void GB_update_mbc_mappings(GB_gameboy_t *gb);
void GB_configure_cart(GB_gameboy_t *gb);
#endif
#endif /* MBC_h */

733
waterbox/sameboy/memory.c
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@ -1,733 +0,0 @@
#include <stdio.h>
#include <stdbool.h>
#include "gb.h"
#include "sgb.h"
typedef uint8_t GB_read_function_t(GB_gameboy_t *gb, uint16_t addr);
typedef void GB_write_function_t(GB_gameboy_t *gb, uint16_t addr, uint8_t value);
typedef enum {
GB_BUS_MAIN, /* In DMG: Cart and RAM. In CGB: Cart only */
GB_BUS_RAM, /* In CGB only. */
GB_BUS_VRAM,
GB_BUS_INTERNAL, /* Anything in highram. Might not be the most correct name. */
} GB_bus_t;
static GB_bus_t bus_for_addr(GB_gameboy_t *gb, uint16_t addr)
{
if (addr < 0x8000) {
return GB_BUS_MAIN;
}
if (addr < 0xA000) {
return GB_BUS_VRAM;
}
if (addr < 0xC000) {
return GB_BUS_MAIN;
}
if (addr < 0xFE00) {
return gb->is_cgb? GB_BUS_RAM : GB_BUS_MAIN;
}
return GB_BUS_INTERNAL;
}
static bool is_addr_in_dma_use(GB_gameboy_t *gb, uint16_t addr)
{
if (!gb->dma_steps_left || (gb->dma_cycles < 0 && !gb->is_dma_restarting)) return false;
return bus_for_addr(gb, addr) == bus_for_addr(gb, gb->dma_current_src);
}
static uint8_t read_rom(GB_gameboy_t *gb, uint16_t addr)
{
if (addr < 0x100 && !gb->boot_rom_finished) {
return gb->boot_rom[addr];
}
if (addr >= 0x200 && addr < 0x900 && gb->is_cgb && !gb->boot_rom_finished) {
return gb->boot_rom[addr];
}
if (!gb->rom_size) {
return 0xFF;
}
unsigned int effective_address = (addr & 0x3FFF) + gb->mbc_rom0_bank * 0x4000;
return gb->rom[effective_address & (gb->rom_size - 1)];
}
static uint8_t read_mbc_rom(GB_gameboy_t *gb, uint16_t addr)
{
unsigned int effective_address = (addr & 0x3FFF) + gb->mbc_rom_bank * 0x4000;
return gb->rom[effective_address & (gb->rom_size - 1)];
}
static uint8_t read_vram(GB_gameboy_t *gb, uint16_t addr)
{
if (gb->vram_read_blocked) {
return 0xFF;
}
return gb->vram[(addr & 0x1FFF) + (uint16_t) gb->cgb_vram_bank * 0x2000];
}
static uint8_t read_mbc_ram(GB_gameboy_t *gb, uint16_t addr)
{
if ((!gb->mbc_ram_enable || !gb->mbc_ram_size) &&
gb->cartridge_type->mbc_subtype != GB_CAMERA &&
gb->cartridge_type->mbc_type != GB_HUC1) return 0xFF;
if (gb->cartridge_type->has_rtc && gb->mbc_ram_bank >= 8 && gb->mbc_ram_bank <= 0xC) {
/* RTC read */
gb->rtc_latched.high |= ~0xC1; /* Not all bytes in RTC high are used. */
return gb->rtc_latched.data[gb->mbc_ram_bank - 8];
}
if (gb->camera_registers_mapped) {
return GB_camera_read_register(gb, addr);
}
if (!gb->mbc_ram) {
return 0xFF;
}
if (gb->cartridge_type->mbc_subtype == GB_CAMERA && gb->mbc_ram_bank == 0 && addr >= 0xa100 && addr < 0xaf00) {
return GB_camera_read_image(gb, addr - 0xa100);
}
uint8_t ret = gb->mbc_ram[((addr & 0x1FFF) + gb->mbc_ram_bank * 0x2000) & (gb->mbc_ram_size - 1)];
if (gb->cartridge_type->mbc_type == GB_MBC2) {
ret |= 0xF0;
}
return ret;
}
static uint8_t read_ram(GB_gameboy_t *gb, uint16_t addr)
{
return gb->ram[addr & 0x0FFF];
}
static uint8_t read_banked_ram(GB_gameboy_t *gb, uint16_t addr)
{
return gb->ram[(addr & 0x0FFF) + gb->cgb_ram_bank * 0x1000];
}
static uint8_t read_high_memory(GB_gameboy_t *gb, uint16_t addr)
{
if (addr < 0xFE00) {
return gb->ram[addr & 0x0FFF];
}
if (addr < 0xFEA0) {
if (gb->oam_read_blocked || (gb->dma_steps_left && (gb->dma_cycles > 0 || gb->is_dma_restarting))) {
return 0xFF;
}
return gb->oam[addr & 0xFF];
}
if (addr < 0xFF00) {
/* Unusable. CGB results are verified, but DMG results were tested on a SGB2 */
if ((gb->io_registers[GB_IO_STAT] & 0x3) >= 2) { /* Seems to be disabled in Modes 2 and 3 */
return 0xFF;
}
if (gb->is_cgb) {
return (addr & 0xF0) | ((addr >> 4) & 0xF);
}
return 0;
}
if (addr < 0xFF80) {
if (addr == 0xff00)
{
if (gb->input_callback)
gb->input_callback(gb);
gb->lagged = false;
if (gb->is_sgb) {
return sgb_read_ff00(gb->cycles_since_epoch);
}
}
switch (addr & 0xFF) {
case GB_IO_IF:
return gb->io_registers[GB_IO_IF] | 0xE0;
case GB_IO_TAC:
return gb->io_registers[GB_IO_TAC] | 0xF8;
case GB_IO_STAT:
return gb->io_registers[GB_IO_STAT] | 0x80;
case GB_IO_DMG_EMULATION_INDICATION:
if (!gb->cgb_mode) {
return 0xFF;
}
return gb->io_registers[GB_IO_DMG_EMULATION_INDICATION] | 0xFE;
case GB_IO_PCM_12:
case GB_IO_PCM_34:
{
if (!gb->is_cgb) return 0xFF;
GB_sample_t dummy;
GB_apu_get_samples_and_update_pcm_regs(gb, &dummy);
}
/* Fall through */
case GB_IO_JOYP:
case GB_IO_TMA:
case GB_IO_LCDC:
case GB_IO_SCY:
case GB_IO_SCX:
case GB_IO_LY:
case GB_IO_LYC:
case GB_IO_BGP:
case GB_IO_OBP0:
case GB_IO_OBP1:
case GB_IO_WY:
case GB_IO_WX:
case GB_IO_SC:
case GB_IO_SB:
return gb->io_registers[addr & 0xFF];
case GB_IO_TIMA:
if (gb->tima_reload_state == GB_TIMA_RELOADING) {
return 0;
}
return gb->io_registers[GB_IO_TIMA];
case GB_IO_DIV:
return gb->div_cycles >> 8;
case GB_IO_HDMA5:
if (!gb->cgb_mode) return 0xFF;
return ((gb->hdma_on || gb->hdma_on_hblank)? 0 : 0x80) | ((gb->hdma_steps_left - 1) & 0x7F);
case GB_IO_SVBK:
if (!gb->cgb_mode) {
return 0xFF;
}
return gb->cgb_ram_bank | ~0x7;
case GB_IO_VBK:
if (!gb->is_cgb) {
return 0xFF;
}
return gb->cgb_vram_bank | ~0x1;
/* Todo: It seems that a CGB in DMG mode can access BGPI and OBPI, but not BGPD and OBPD? */
case GB_IO_BGPI:
case GB_IO_OBPI:
if (!gb->is_cgb) {
return 0xFF;
}
return gb->io_registers[addr & 0xFF] | 0x40;
case GB_IO_BGPD:
case GB_IO_OBPD:
{
if (!gb->cgb_mode && gb->boot_rom_finished) {
return 0xFF;
}
uint8_t index_reg = (addr & 0xFF) - 1;
return ((addr & 0xFF) == GB_IO_BGPD?
gb->background_palettes_data :
gb->sprite_palettes_data)[gb->io_registers[index_reg] & 0x3F];
}
case GB_IO_KEY1:
if (!gb->cgb_mode) {
return 0xFF;
}
return (gb->io_registers[GB_IO_KEY1] & 0x7F) | (gb->cgb_double_speed? 0xFE : 0x7E);
case GB_IO_RP: {
if (!gb->cgb_mode) return 0xFF;
/* You will read your own IR LED if it's on. */
bool read_value = gb->infrared_input || (gb->io_registers[GB_IO_RP] & 1);
uint8_t ret = (gb->io_registers[GB_IO_RP] & 0xC1) | 0x3C;
if ((gb->io_registers[GB_IO_RP] & 0xC0) == 0xC0 && read_value) {
ret |= 2;
}
return ret;
}
case GB_IO_DMA:
/* Todo: is this documented? */
return gb->is_cgb? 0x00 : 0xFF;
case GB_IO_UNKNOWN2:
case GB_IO_UNKNOWN3:
return gb->is_cgb? gb->io_registers[addr & 0xFF] : 0xFF;
case GB_IO_UNKNOWN4:
return gb->cgb_mode? gb->io_registers[addr & 0xFF] : 0xFF;
case GB_IO_UNKNOWN5:
return gb->is_cgb? gb->io_registers[addr & 0xFF] | 0x8F : 0xFF;
default:
if ((addr & 0xFF) >= GB_IO_NR10 && (addr & 0xFF) <= GB_IO_WAV_END) {
return GB_apu_read(gb, addr & 0xFF);
}
return 0xFF;
}
/* Hardware registers */
return 0;
}
if (addr == 0xFFFF) {
/* Interrupt Mask */
return gb->interrupt_enable;
}
/* HRAM */
return gb->hram[addr - 0xFF80];
}
static GB_read_function_t * const read_map[] =
{
read_rom, read_rom, read_rom, read_rom, /* 0XXX, 1XXX, 2XXX, 3XXX */
read_mbc_rom, read_mbc_rom, read_mbc_rom, read_mbc_rom, /* 4XXX, 5XXX, 6XXX, 7XXX */
read_vram, read_vram, /* 8XXX, 9XXX */
read_mbc_ram, read_mbc_ram, /* AXXX, BXXX */
read_ram, read_banked_ram, /* CXXX, DXXX */
read_high_memory, read_high_memory, /* EXXX FXXX */
};
uint8_t GB_read_memory(GB_gameboy_t *gb, uint16_t addr)
{
if (is_addr_in_dma_use(gb, addr)) {
addr = gb->dma_current_src;
}
return read_map[addr >> 12](gb, addr);
}
static void write_mbc(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
{
switch (gb->cartridge_type->mbc_type) {
case GB_NO_MBC: return;
case GB_MBC1:
switch (addr & 0xF000) {
case 0x0000: case 0x1000: gb->mbc_ram_enable = (value & 0xF) == 0xA; break;
case 0x2000: case 0x3000: gb->mbc1.bank_low = value; break;
case 0x4000: case 0x5000: gb->mbc1.bank_high = value; break;
case 0x6000: case 0x7000: gb->mbc1.mode = value; break;
}
break;
case GB_MBC2:
switch (addr & 0xF000) {
case 0x0000: case 0x1000: if (!(addr & 0x100)) gb->mbc_ram_enable = (value & 0xF) == 0xA; break;
case 0x2000: case 0x3000: if ( addr & 0x100) gb->mbc2.rom_bank = value; break;
}
break;
case GB_MBC3:
switch (addr & 0xF000) {
case 0x0000: case 0x1000: gb->mbc_ram_enable = (value & 0xF) == 0xA; break;
case 0x2000: case 0x3000: gb->mbc3.rom_bank = value; break;
case 0x4000: case 0x5000: gb->mbc3.ram_bank = value; break;
case 0x6000: case 0x7000:
if (!gb->rtc_latch && (value & 1)) { /* Todo: verify condition is correct */
memcpy(&gb->rtc_latched, &gb->rtc_real, sizeof(gb->rtc_real));
}
gb->rtc_latch = value & 1;
break;
}
break;
case GB_MBC5:
switch (addr & 0xF000) {
case 0x0000: case 0x1000: gb->mbc_ram_enable = (value & 0xF) == 0xA; break;
case 0x2000: gb->mbc5.rom_bank_low = value; break;
case 0x3000: gb->mbc5.rom_bank_high = value; break;
case 0x4000: case 0x5000:
if (gb->cartridge_type->has_rumble) {
if (!!(value & 8) != gb->rumble_state) {
gb->rumble_state = !gb->rumble_state;
if (gb->rumble_callback) {
gb->rumble_callback(gb, gb->rumble_state);
}
}
value &= 7;
}
gb->mbc5.ram_bank = value;
gb->camera_registers_mapped = (value & 0x10) && gb->cartridge_type->mbc_subtype == GB_CAMERA;
break;
}
break;
case GB_HUC1:
switch (addr & 0xF000) {
case 0x0000: case 0x1000: gb->mbc_ram_enable = (value & 0xF) == 0xA; break;
case 0x2000: case 0x3000: gb->huc1.bank_low = value; break;
case 0x4000: case 0x5000: gb->huc1.bank_high = value; break;
case 0x6000: case 0x7000: gb->huc1.mode = value; break;
}
break;
case GB_HUC3:
switch (addr & 0xF000) {
case 0x0000: case 0x1000: gb->mbc_ram_enable = (value & 0xF) == 0xA; break;
case 0x2000: case 0x3000: gb->huc3.rom_bank = value; break;
case 0x4000: case 0x5000: gb->huc3.ram_bank = value; break;
}
break;
}
GB_update_mbc_mappings(gb);
}
static void write_vram(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
{
if (gb->vram_write_blocked) {
//GB_log(gb, "Wrote %02x to %04x (VRAM) during mode 3\n", value, addr);
return;
}
gb->vram[(addr & 0x1FFF) + (uint16_t) gb->cgb_vram_bank * 0x2000] = value;
}
static void write_mbc_ram(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
{
if (gb->camera_registers_mapped) {
GB_camera_write_register(gb, addr, value);
return;
}
if (!gb->mbc_ram_enable || !gb->mbc_ram_size) return;
if (gb->cartridge_type->has_rtc && gb->mbc_ram_bank >= 8 && gb->mbc_ram_bank <= 0xC) {
/* RTC read */
gb->rtc_latched.data[gb->mbc_ram_bank - 8] = gb->rtc_real.data[gb->mbc_ram_bank - 8] = value; /* Todo: does it really write both? */
}
if (!gb->mbc_ram) {
return;
}
gb->mbc_ram[((addr & 0x1FFF) + gb->mbc_ram_bank * 0x2000) & (gb->mbc_ram_size - 1)] = value;
}
static void write_ram(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
{
gb->ram[addr & 0x0FFF] = value;
}
static void write_banked_ram(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
{
gb->ram[(addr & 0x0FFF) + gb->cgb_ram_bank * 0x1000] = value;
}
static void write_high_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
{
if (addr < 0xFE00) {
GB_log(gb, "Wrote %02x to %04x (RAM Mirror)\n", value, addr);
gb->ram[addr & 0x0FFF] = value;
return;
}
if (addr < 0xFEA0) {
if (gb->oam_write_blocked|| (gb->dma_steps_left && (gb->dma_cycles > 0 || gb->is_dma_restarting))) {
return;
}
gb->oam[addr & 0xFF] = value;
return;
}
if (addr < 0xFF00) {
GB_log(gb, "Wrote %02x to %04x (Unused)\n", value, addr);
return;
}
if (addr < 0xFF80) {
if (addr == 0xff00 && gb->is_sgb)
{
sgb_write_ff00(value, gb->cycles_since_epoch);
return;
}
/* Hardware registers */
switch (addr & 0xFF) {
case GB_IO_SCX:
case GB_IO_IF:
case GB_IO_SCY:
case GB_IO_LYC:
case GB_IO_BGP:
case GB_IO_OBP0:
case GB_IO_OBP1:
case GB_IO_WY:
case GB_IO_WX:
case GB_IO_SB:
case GB_IO_DMG_EMULATION_INDICATION:
case GB_IO_UNKNOWN2:
case GB_IO_UNKNOWN3:
case GB_IO_UNKNOWN4:
case GB_IO_UNKNOWN5:
gb->io_registers[addr & 0xFF] = value;
return;
case GB_IO_TIMA:
if (gb->tima_reload_state != GB_TIMA_RELOADED) {
gb->io_registers[GB_IO_TIMA] = value;
}
return;
case GB_IO_TMA:
gb->io_registers[GB_IO_TMA] = value;
if (gb->tima_reload_state != GB_TIMA_RUNNING) {
gb->io_registers[GB_IO_TIMA] = value;
}
return;
case GB_IO_TAC:
GB_emulate_timer_glitch(gb, gb->io_registers[GB_IO_TAC], value);
gb->io_registers[GB_IO_TAC] = value;
return;
case GB_IO_LCDC:
if ((value & 0x80) && !(gb->io_registers[GB_IO_LCDC] & 0x80)) {
/* It appears that there's a slight delay after enabling the screen? */
/* Todo: verify this. */
gb->display_cycles = 0;
gb->first_scanline = true;
if (gb->frame_skip_state == GB_FRAMESKIP_SECOND_FRAME_RENDERED) {
gb->frame_skip_state = GB_FRAMESKIP_LCD_TURNED_ON;
}
}
gb->io_registers[GB_IO_LCDC] = value;
return;
case GB_IO_STAT:
/* A DMG bug: http://www.devrs.com/gb/files/faqs.html#GBBugs */
if (!gb->is_cgb && !gb->stat_interrupt_line &&
(gb->io_registers[GB_IO_STAT] & 0x3) < 2 && (gb->io_registers[GB_IO_LCDC] & 0x80)) {
gb->io_registers[GB_IO_IF] |= 2;
}
/* Delete previous R/W bits */
gb->io_registers[GB_IO_STAT] &= 7;
/* Set them by value */
gb->io_registers[GB_IO_STAT] |= value & ~7;
/* Set unused bit to 1 */
gb->io_registers[GB_IO_STAT] |= 0x80;
return;
case GB_IO_DIV:
GB_set_internal_div_counter(gb, 0);
return;
case GB_IO_JOYP:
gb->io_registers[GB_IO_JOYP] &= 0x0F;
gb->io_registers[GB_IO_JOYP] |= value & 0xF0;
GB_update_joyp(gb);
return;
case GB_IO_BIOS:
gb->boot_rom_finished = true;
return;
case GB_IO_DMG_EMULATION:
if (gb->is_cgb && !gb->boot_rom_finished) {
gb->cgb_mode = value != 4; /* The real "contents" of this register aren't quite known yet. */
}
return;
case GB_IO_DMA:
if (value <= 0xE0) {
if (gb->dma_steps_left) {
/* This is not correct emulation, since we're not really delaying the second DMA.
One write that should have happened in the first DMA will not happen. However,
since that byte will be overwritten by the second DMA before it can actually be
read, it doesn't actually matter. */
gb->is_dma_restarting = true;
}
gb->dma_cycles = -7;
gb->dma_current_dest = 0;
gb->dma_current_src = value << 8;
gb->dma_steps_left = 0xa0;
}
/* else { what? } */
return;
case GB_IO_SVBK:
if (!gb->cgb_mode) {
return;
}
gb->cgb_ram_bank = value & 0x7;
if (!gb->cgb_ram_bank) {
gb->cgb_ram_bank++;
}
return;
case GB_IO_VBK:
if (!gb->cgb_mode) {
return;
}
gb->cgb_vram_bank = value & 0x1;
return;
case GB_IO_BGPI:
case GB_IO_OBPI:
if (!gb->is_cgb) {
return;
}
gb->io_registers[addr & 0xFF] = value;
return;
case GB_IO_BGPD:
case GB_IO_OBPD:
if (!gb->cgb_mode && gb->boot_rom_finished) {
/* Todo: Due to the behavior of a broken Game & Watch Gallery 2 ROM on a real CGB. A proper test ROM
is required. */
return;
}
uint8_t index_reg = (addr & 0xFF) - 1;
((addr & 0xFF) == GB_IO_BGPD?
gb->background_palettes_data :
gb->sprite_palettes_data)[gb->io_registers[index_reg] & 0x3F] = value;
GB_palette_changed(gb, (addr & 0xFF) == GB_IO_BGPD, gb->io_registers[index_reg] & 0x3F);
if (gb->io_registers[index_reg] & 0x80) {
gb->io_registers[index_reg]++;
gb->io_registers[index_reg] |= 0x80;
}
return;
case GB_IO_KEY1:
if (!gb->is_cgb) {
return;
}
gb->io_registers[GB_IO_KEY1] = value;
return;
case GB_IO_HDMA1:
if (gb->cgb_mode) {
gb->hdma_current_src &= 0xF0;
gb->hdma_current_src |= value << 8;
}
return;
case GB_IO_HDMA2:
if (gb->cgb_mode) {
gb->hdma_current_src &= 0xFF00;
gb->hdma_current_src |= value & 0xF0;
}
return;
case GB_IO_HDMA3:
if (gb->cgb_mode) {
gb->hdma_current_dest &= 0xF0;
gb->hdma_current_dest |= value << 8;
}
return;
case GB_IO_HDMA4:
if (gb->cgb_mode) {
gb->hdma_current_dest &= 0x1F00;
gb->hdma_current_dest |= value & 0xF0;
}
return;
case GB_IO_HDMA5:
if (!gb->cgb_mode) return;
if ((value & 0x80) == 0 && gb->hdma_on_hblank) {
gb->hdma_on_hblank = false;
return;
}
gb->hdma_on = (value & 0x80) == 0;
gb->hdma_on_hblank = (value & 0x80) != 0;
if (gb->hdma_on_hblank && (gb->io_registers[GB_IO_STAT] & 3) == 0) {
gb->hdma_on = true;
gb->hdma_cycles = 0;
}
gb->io_registers[GB_IO_HDMA5] = value;
gb->hdma_steps_left = (gb->io_registers[GB_IO_HDMA5] & 0x7F) + 1;
/* Todo: Verify this. Gambatte's DMA tests require this. */
if (gb->hdma_current_dest + (gb->hdma_steps_left << 4) > 0xFFFF) {
gb->hdma_steps_left = (0x10000 - gb->hdma_current_dest) >> 4;
}
gb->hdma_cycles = 0;
return;
/* Todo: what happens when starting a transfer during a transfer?
What happens when starting a transfer during external clock?
*/
case GB_IO_SC:
if (!gb->cgb_mode) {
value |= 2;
}
gb->io_registers[GB_IO_SC] = value | (~0x83);
if ((value & 0x80) && (value & 0x1) ) {
gb->serial_length = gb->cgb_mode && (value & 2)? 128 : 4096;
/* Todo: This is probably incorrect for CGB's faster clock mode. */
gb->serial_cycles &= 0xFF;
if (gb->serial_transfer_start_callback) {
gb->serial_transfer_start_callback(gb, gb->io_registers[GB_IO_SB]);
}
}
else {
gb->serial_length = 0;
}
return;
case GB_IO_RP: {
if (!gb->is_cgb) {
return;
}
if ((value & 1) != (gb->io_registers[GB_IO_RP] & 1)) {
if (gb->infrared_callback) {
gb->infrared_callback(gb, value & 1, gb->cycles_since_ir_change);
gb->cycles_since_ir_change = 0;
}
}
gb->io_registers[GB_IO_RP] = value;
return;
}
default:
if ((addr & 0xFF) >= GB_IO_NR10 && (addr & 0xFF) <= GB_IO_WAV_END) {
GB_apu_write(gb, addr & 0xFF, value);
return;
}
GB_log(gb, "Wrote %02x to %04x (HW Register)\n", value, addr);
return;
}
}
if (addr == 0xFFFF) {
/* Interrupt mask */
gb->interrupt_enable = value;
return;
}
/* HRAM */
gb->hram[addr - 0xFF80] = value;
}
static GB_write_function_t * const write_map[] =
{
write_mbc, write_mbc, write_mbc, write_mbc, /* 0XXX, 1XXX, 2XXX, 3XXX */
write_mbc, write_mbc, write_mbc, write_mbc, /* 4XXX, 5XXX, 6XXX, 7XXX */
write_vram, write_vram, /* 8XXX, 9XXX */
write_mbc_ram, write_mbc_ram, /* AXXX, BXXX */
write_ram, write_banked_ram, /* CXXX, DXXX */
write_high_memory, write_high_memory, /* EXXX FXXX */
};
void GB_write_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
{
if (is_addr_in_dma_use(gb, addr)) {
/* Todo: What should happen? Will this affect DMA? Will data be written? What and where? */
return;
}
write_map[addr >> 12](gb, addr, value);
}
void GB_dma_run(GB_gameboy_t *gb)
{
while (gb->dma_cycles >= 4 && gb->dma_steps_left) {
/* Todo: measure this value */
gb->dma_cycles -= 4;
gb->dma_steps_left--;
gb->oam[gb->dma_current_dest++] = GB_read_memory(gb, gb->dma_current_src);
/* dma_current_src must be the correct value during GB_read_memory */
gb->dma_current_src++;
if (!gb->dma_steps_left) {
gb->is_dma_restarting = false;
}
}
}
void GB_hdma_run(GB_gameboy_t *gb)
{
if (!gb->hdma_on) return;
while (gb->hdma_cycles >= 8) {
gb->hdma_cycles -= 8;
for (uint8_t i = 0; i < 0x10; i++) {
GB_write_memory(gb, 0x8000 | (gb->hdma_current_dest++ & 0x1FFF), GB_read_memory(gb, (gb->hdma_current_src++)));
}
if(--gb->hdma_steps_left == 0){
gb->hdma_on = false;
gb->hdma_on_hblank = false;
gb->io_registers[GB_IO_HDMA5] &= 0x7F;
break;
}
if (gb->hdma_on_hblank) {
gb->hdma_on = false;
break;
}
}
}

12
waterbox/sameboy/memory.h
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@ -1,12 +0,0 @@
#ifndef memory_h
#define memory_h
#include "gb.h"
uint8_t GB_read_memory(GB_gameboy_t *gb, uint16_t addr);
void GB_write_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value);
#ifdef GB_INTERNAL
void GB_dma_run(GB_gameboy_t *gb);
void GB_hdma_run(GB_gameboy_t *gb);
#endif
#endif /* memory_h */

205
waterbox/sameboy/printer.c
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@ -1,205 +0,0 @@
#include "gb.h"
#include "../emulibc/emulibc.h"
/* TODO: Emulation is VERY basic and assumes the ROM correctly uses the printer's interface.
Incorrect usage is not correctly emulated, as it's not well documented, nor do I
have my own GB Printer to figure it out myself.
It also does not currently emulate communication timeout, which means that a bug
might prevent the printer operation until the GameBoy is restarted.
Also, field mask values are assumed. */
// hackadoodle! we must not overflow the stack
static ECL_INVISIBLE uint32_t tmp_image[160 * 200];
static void handle_command(GB_gameboy_t *gb)
{
switch (gb->printer.command_id) {
case GB_PRINTER_INIT_COMMAND:
gb->printer.status = 0;
gb->printer.image_offset = 0;
break;
case GB_PRINTER_START_COMMAND:
if (gb->printer.command_length == 4) {
gb->printer.status = 6; /* Printing */
uint32_t *const image = tmp_image;
uint8_t palette = gb->printer.command_data[2];
uint32_t colors[4] = {gb->rgb_encode_callback(gb, 0xff, 0xff, 0xff),
gb->rgb_encode_callback(gb, 0xaa, 0xaa, 0xaa),
gb->rgb_encode_callback(gb, 0x55, 0x55, 0x55),
gb->rgb_encode_callback(gb, 0x00, 0x00, 0x00)};
for (unsigned i = 0; i < gb->printer.image_offset; i++) {
image[i] = colors[(palette >> (gb->printer.image[i] * 2)) & 3];
}
if (gb->printer.callback) {
gb->printer.callback(gb, image, gb->printer.image_offset / 160,
gb->printer.command_data[1] >> 4, gb->printer.command_data[1] & 7,
gb->printer.command_data[3] & 0x7F);
}
gb->printer.image_offset = 0;
}
break;
case GB_PRINTER_DATA_COMMAND:
if (gb->printer.command_length == GB_PRINTER_DATA_SIZE) {
gb->printer.image_offset %= sizeof(gb->printer.image);
gb->printer.status = 8; /* Received 0x280 bytes */
uint8_t *byte = gb->printer.command_data;
for (unsigned row = 2; row--; ) {
for (unsigned tile_x = 0; tile_x < 160 / 8; tile_x++) {
for (unsigned y = 0; y < 8; y++, byte += 2) {
for (unsigned x_pixel = 0; x_pixel < 8; x_pixel++) {
gb->printer.image[gb->printer.image_offset + tile_x * 8 + x_pixel + y * 160] =
((*byte) >> 7) | (((*(byte + 1)) >> 7) << 1);
(*byte) <<= 1;
(*(byte + 1)) <<= 1;
}
}
}
gb->printer.image_offset += 8 * 160;
}
}
case GB_PRINTER_NOP_COMMAND:
default:
break;
}
}
static void serial_start(GB_gameboy_t *gb, uint8_t byte_received)
{
gb->printer.byte_to_send = 0;
switch (gb->printer.command_state) {
case GB_PRINTER_COMMAND_MAGIC1:
if (byte_received != 0x88) {
return;
}
gb->printer.status &= ~1;
gb->printer.command_length = 0;
gb->printer.checksum = 0;
break;
case GB_PRINTER_COMMAND_MAGIC2:
if (byte_received != 0x33) {
if (byte_received != 0x88) {
gb->printer.command_state = GB_PRINTER_COMMAND_MAGIC1;
}
return;
}
break;
case GB_PRINTER_COMMAND_ID:
gb->printer.command_id = byte_received & 0xF;
break;
case GB_PRINTER_COMMAND_COMPRESSION:
gb->printer.compression = byte_received & 1;
break;
case GB_PRINTER_COMMAND_LENGTH_LOW:
gb->printer.length_left = byte_received;
break;
case GB_PRINTER_COMMAND_LENGTH_HIGH:
gb->printer.length_left |= (byte_received & 3) << 8;
break;
case GB_PRINTER_COMMAND_DATA:
if (gb->printer.command_length != GB_PRINTER_MAX_COMMAND_LENGTH) {
if (gb->printer.compression) {
if (!gb->printer.compression_run_lenth) {
gb->printer.compression_run_is_compressed = byte_received & 0x80;
gb->printer.compression_run_lenth = (byte_received & 0x7F) + 1 + gb->printer.compression_run_is_compressed;
}
else if (gb->printer.compression_run_is_compressed) {
while (gb->printer.compression_run_lenth) {
gb->printer.command_data[gb->printer.command_length++] = byte_received;
gb->printer.compression_run_lenth--;
if (gb->printer.command_length == GB_PRINTER_MAX_COMMAND_LENGTH) {
gb->printer.compression_run_lenth = 0;
}
}
}
else {
gb->printer.command_data[gb->printer.command_length++] = byte_received;
gb->printer.compression_run_lenth--;
}
}
else {
gb->printer.command_data[gb->printer.command_length++] = byte_received;
}
}
gb->printer.length_left--;
break;
case GB_PRINTER_COMMAND_CHECKSUM_LOW:
gb->printer.checksum ^= byte_received;
break;
case GB_PRINTER_COMMAND_CHECKSUM_HIGH:
gb->printer.checksum ^= byte_received << 8;
if (gb->printer.checksum) {
gb->printer.status |= 1; /* Checksum error*/
gb->printer.command_state = GB_PRINTER_COMMAND_MAGIC1;
return;
}
break;
case GB_PRINTER_COMMAND_ACTIVE:
gb->printer.byte_to_send = 0x81;
break;
case GB_PRINTER_COMMAND_STATUS:
if ((gb->printer.command_id & 0xF) == GB_PRINTER_INIT_COMMAND) {
/* Games expect INIT commands to return 0? */
gb->printer.byte_to_send = 0;
}
else {
gb->printer.byte_to_send = gb->printer.status;
}
/* Printing is done instantly, but let the game recieve a 6 (Printing) status at least once, for compatibility */
if (gb->printer.status == 6) {
gb->printer.status = 4; /* Done */
}
gb->printer.command_state = GB_PRINTER_COMMAND_MAGIC1;
handle_command(gb);
return;
}
if (gb->printer.command_state >= GB_PRINTER_COMMAND_ID && gb->printer.command_state < GB_PRINTER_COMMAND_CHECKSUM_LOW) {
gb->printer.checksum += byte_received;
}
if (gb->printer.command_state != GB_PRINTER_COMMAND_DATA) {
gb->printer.command_state++;
}
if (gb->printer.command_state == GB_PRINTER_COMMAND_DATA) {
if (gb->printer.length_left == 0) {
gb->printer.command_state++;
}
}
}
static uint8_t serial_end(GB_gameboy_t *gb)
{
return gb->printer.byte_to_send;
}
void GB_connect_printer(GB_gameboy_t *gb, GB_print_image_callback_t callback)
{
memset(&gb->printer, 0, sizeof(gb->printer));
GB_set_serial_transfer_start_callback(gb, serial_start);
GB_set_serial_transfer_end_callback(gb, serial_end);
gb->printer.callback = callback;
}

59
waterbox/sameboy/printer.h
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@ -1,59 +0,0 @@
#ifndef printer_h
#define printer_h
#include <stdint.h>
#include <stdbool.h>
#include "gb_struct_def.h"
#define GB_PRINTER_MAX_COMMAND_LENGTH 0x280
#define GB_PRINTER_DATA_SIZE 0x280
typedef void (*GB_print_image_callback_t)(GB_gameboy_t *gb,
uint32_t *image,
uint8_t height,
uint8_t top_margin,
uint8_t bottom_margin,
uint8_t exposure);
typedef struct
{
/* Communication state machine */
enum {
GB_PRINTER_COMMAND_MAGIC1,
GB_PRINTER_COMMAND_MAGIC2,
GB_PRINTER_COMMAND_ID,
GB_PRINTER_COMMAND_COMPRESSION,
GB_PRINTER_COMMAND_LENGTH_LOW,
GB_PRINTER_COMMAND_LENGTH_HIGH,
GB_PRINTER_COMMAND_DATA,
GB_PRINTER_COMMAND_CHECKSUM_LOW,
GB_PRINTER_COMMAND_CHECKSUM_HIGH,
GB_PRINTER_COMMAND_ACTIVE,
GB_PRINTER_COMMAND_STATUS,
} command_state : 8;
enum {
GB_PRINTER_INIT_COMMAND = 1,
GB_PRINTER_START_COMMAND = 2,
GB_PRINTER_DATA_COMMAND = 4,
GB_PRINTER_NOP_COMMAND = 0xF,
} command_id : 8;
bool compression;
uint16_t length_left;
uint8_t command_data[GB_PRINTER_MAX_COMMAND_LENGTH];
uint16_t command_length;
uint16_t checksum;
uint8_t status;
uint8_t byte_to_send;
uint8_t image[160 * 200];
uint16_t image_offset;
GB_print_image_callback_t callback;
uint8_t compression_run_lenth;
bool compression_run_is_compressed;
} GB_printer_t;
void GB_connect_printer(GB_gameboy_t *gb, GB_print_image_callback_t callback);
#endif

1043
waterbox/sameboy/sgb.c
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File diff suppressed because it is too large Load Diff

36
waterbox/sameboy/sgb.h
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@ -1,36 +0,0 @@
#pragma once
#include <stdint.h>
// whenever a time is asked for, it is relative to a clock that ticks 35112 times
// per nominal frame on the GB lcd, starts at 0 when emulation begins, and never resets/rebases
// write to MMIO ff00. only bits 4 and 5 are used
void sgb_write_ff00(uint8_t val, uint64_t time);
// read from MMIO ff00. supplies data for all 8 bits
uint8_t sgb_read_ff00(uint64_t time);
// set controller data to be used by subsequent controller reads
// buttons[0] = controller 1, buttons[3] = controller 4
// 7......0
// DULRSsBA
void sgb_set_controller_data(const uint8_t* buttons);
// initialize the SGB module. pass an SPC file that results from the real S-CPU initialization,
// and the length of that file
int sgb_init(const uint8_t* spc, int length);
// call whenever the gameboy has finished producing a video frame
// data is 32bpp 160x144 screen data. for each pixel:
//31 7 0
// xxxxxxxx xxxxxxxx xxxxxxxx DDxxxxxx -- DD = 0, 1, 2, or 3. x = don't care
void sgb_take_frame(uint32_t* vbuff);
// copy the finished video frame to an output buffer. pixel format is 32bpp xrgb
// can be called at any time, including right after sgb_take_frame
void sgb_render_frame(uint32_t* vbuff);
// call to finish a frame's worth of audio. should be called once every 35112 time units (some jitter is OK)
// callback will be called with L and R sample values for various time points
// between the last time sgb_render_audio was called and now
void sgb_render_audio(uint64_t time, void(*callback)(int16_t l, int16_t r, uint64_t time));

564
waterbox/sameboy/snes_spc/SNES_SPC.cpp
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@ -1,564 +0,0 @@
// Core SPC emulation: CPU, timers, SMP registers, memory
// snes_spc 0.9.0. http://www.slack.net/~ant/
#include "SNES_SPC.h"
#include <string.h>
/* Copyright (C) 2004-2007 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details. You should have received a copy of the GNU Lesser General Public
License along with this module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
#include "blargg_source.h"
#define RAM (m.ram.ram)
#define REGS (m.smp_regs [0])
#define REGS_IN (m.smp_regs [1])
// (n ? n : 256)
#define IF_0_THEN_256( n ) ((uint8_t) ((n) - 1) + 1)
// Note: SPC_MORE_ACCURACY exists mainly so I can run my validation tests, which
// do crazy echo buffer accesses.
#ifndef SPC_MORE_ACCURACY
#define SPC_MORE_ACCURACY 0
#endif
#ifdef BLARGG_ENABLE_OPTIMIZER
#include BLARGG_ENABLE_OPTIMIZER
#endif
//// Timers
#if SPC_DISABLE_TEMPO
#define TIMER_DIV( t, n ) ((n) >> t->prescaler)
#define TIMER_MUL( t, n ) ((n) << t->prescaler)
#else
#define TIMER_DIV( t, n ) ((n) / t->prescaler)
#define TIMER_MUL( t, n ) ((n) * t->prescaler)
#endif
SNES_SPC::Timer* SNES_SPC::run_timer_( Timer* t, rel_time_t time )
{
int elapsed = TIMER_DIV( t, time - t->next_time ) + 1;
t->next_time += TIMER_MUL( t, elapsed );
if ( t->enabled )
{
int remain = IF_0_THEN_256( t->period - t->divider );
int divider = t->divider + elapsed;
int over = elapsed - remain;
if ( over >= 0 )
{
int n = over / t->period;
t->counter = (t->counter + 1 + n) & 0x0F;
divider = over - n * t->period;
}
t->divider = (uint8_t) divider;
}
return t;
}
inline SNES_SPC::Timer* SNES_SPC::run_timer( Timer* t, rel_time_t time )
{
if ( time >= t->next_time )
t = run_timer_( t, time );
return t;
}
//// ROM
void SNES_SPC::enable_rom( int enable )
{
if ( m.rom_enabled != enable )
{
m.rom_enabled = enable;
if ( enable )
memcpy( m.hi_ram, &RAM [rom_addr], sizeof m.hi_ram );
memcpy( &RAM [rom_addr], (enable ? m.rom : m.hi_ram), rom_size );
// TODO: ROM can still get overwritten when DSP writes to echo buffer
}
}
//// DSP
#if SPC_LESS_ACCURATE
int const max_reg_time = 29;
signed char const SNES_SPC::reg_times_ [256] =
{
-1, 0,-11,-10,-15,-11, -2, -2, 4, 3, 14, 14, 26, 26, 14, 22,
2, 3, 0, 1,-12, 0, 1, 1, 7, 6, 14, 14, 27, 14, 14, 23,
5, 6, 3, 4, -1, 3, 4, 4, 10, 9, 14, 14, 26, -5, 14, 23,
8, 9, 6, 7, 2, 6, 7, 7, 13, 12, 14, 14, 27, -4, 14, 24,
11, 12, 9, 10, 5, 9, 10, 10, 16, 15, 14, 14, -2, -4, 14, 24,
14, 15, 12, 13, 8, 12, 13, 13, 19, 18, 14, 14, -2,-36, 14, 24,
17, 18, 15, 16, 11, 15, 16, 16, 22, 21, 14, 14, 28, -3, 14, 25,
20, 21, 18, 19, 14, 18, 19, 19, 25, 24, 14, 14, 14, 29, 14, 25,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
};
#define RUN_DSP( time, offset ) \
int count = (time) - (offset) - m.dsp_time;\
if ( count >= 0 )\
{\
int clock_count = (count & ~(clocks_per_sample - 1)) + clocks_per_sample;\
m.dsp_time += clock_count;\
dsp.run( clock_count );\
}
#else
#define RUN_DSP( time, offset ) \
{\
int count = (time) - m.dsp_time;\
if ( !SPC_MORE_ACCURACY || count )\
{\
assert( count > 0 );\
m.dsp_time = (time);\
dsp.run( count );\
}\
}
#endif
int SNES_SPC::dsp_read( rel_time_t time )
{
RUN_DSP( time, reg_times [REGS [r_dspaddr] & 0x7F] );
int result = dsp.read( REGS [r_dspaddr] & 0x7F );
#ifdef SPC_DSP_READ_HOOK
SPC_DSP_READ_HOOK( spc_time + time, (REGS [r_dspaddr] & 0x7F), result );
#endif
return result;
}
inline void SNES_SPC::dsp_write( int data, rel_time_t time )
{
RUN_DSP( time, reg_times [REGS [r_dspaddr]] )
#if SPC_LESS_ACCURATE
else if ( m.dsp_time == skipping_time )
{
int r = REGS [r_dspaddr];
if ( r == SPC_DSP::r_kon )
m.skipped_kon |= data & ~dsp.read( SPC_DSP::r_koff );
if ( r == SPC_DSP::r_koff )
{
m.skipped_koff |= data;
m.skipped_kon &= ~data;
}
}
#endif
#ifdef SPC_DSP_WRITE_HOOK
SPC_DSP_WRITE_HOOK( m.spc_time + time, REGS [r_dspaddr], (uint8_t) data );
#endif
if ( REGS [r_dspaddr] <= 0x7F )
dsp.write( REGS [r_dspaddr], data );
else if ( !SPC_MORE_ACCURACY )
dprintf( "SPC wrote to DSP register > $7F\n" );
}
//// Memory access extras
#if SPC_MORE_ACCURACY
#define MEM_ACCESS( time, addr ) \
{\
if ( time >= m.dsp_time )\
{\
RUN_DSP( time, max_reg_time );\
}\
}
#elif !defined (NDEBUG)
// Debug-only check for read/write within echo buffer, since this might result in
// inaccurate emulation due to the DSP not being caught up to the present.
bool SNES_SPC::check_echo_access( int addr )
{
if ( !(dsp.read( SPC_DSP::r_flg ) & 0x20) )
{
int start = 0x100 * dsp.read( SPC_DSP::r_esa );
int size = 0x800 * (dsp.read( SPC_DSP::r_edl ) & 0x0F);
int end = start + (size ? size : 4);
if ( start <= addr && addr < end )
{
if ( !m.echo_accessed )
{
m.echo_accessed = 1;
return true;
}
}
}
return false;
}
#define MEM_ACCESS( time, addr ) check( !check_echo_access( (uint16_t) addr ) );
#else
#define MEM_ACCESS( time, addr )
#endif
//// CPU write
#if SPC_MORE_ACCURACY
static unsigned char const glitch_probs [3] [256] =
{
0xC3,0x92,0x5B,0x1C,0xD1,0x92,0x5B,0x1C,0xDB,0x9C,0x72,0x18,0xCD,0x5C,0x38,0x0B,
0xE1,0x9C,0x74,0x17,0xCF,0x75,0x45,0x0C,0xCF,0x6E,0x4A,0x0D,0xA3,0x3A,0x1D,0x08,
0xDB,0xA0,0x82,0x19,0xD9,0x73,0x3C,0x0E,0xCB,0x76,0x52,0x0B,0xA5,0x46,0x1D,0x09,
0xDA,0x74,0x55,0x0F,0xA2,0x3F,0x21,0x05,0x9A,0x40,0x20,0x07,0x63,0x1E,0x10,0x01,
0xDF,0xA9,0x85,0x1D,0xD3,0x84,0x4B,0x0E,0xCF,0x6F,0x49,0x0F,0xB3,0x48,0x1E,0x05,
0xD8,0x77,0x52,0x12,0xB7,0x49,0x23,0x06,0xAA,0x45,0x28,0x07,0x7D,0x28,0x0F,0x07,
0xCC,0x7B,0x4A,0x0E,0xB2,0x4F,0x24,0x07,0xAD,0x43,0x2C,0x06,0x86,0x29,0x11,0x07,
0xAE,0x48,0x1F,0x0A,0x76,0x21,0x19,0x05,0x76,0x21,0x14,0x05,0x44,0x11,0x0B,0x01,
0xE7,0xAD,0x96,0x23,0xDC,0x86,0x59,0x0E,0xDC,0x7C,0x5F,0x15,0xBB,0x53,0x2E,0x09,
0xD6,0x7C,0x4A,0x16,0xBB,0x4A,0x25,0x08,0xB3,0x4F,0x28,0x0B,0x8E,0x23,0x15,0x08,
0xCF,0x7F,0x57,0x11,0xB5,0x4A,0x23,0x0A,0xAA,0x42,0x28,0x05,0x7D,0x22,0x12,0x03,
0xA6,0x49,0x28,0x09,0x82,0x2B,0x0D,0x04,0x7A,0x20,0x0F,0x04,0x3D,0x0F,0x09,0x03,
0xD1,0x7C,0x4C,0x0F,0xAF,0x4E,0x21,0x09,0xA8,0x46,0x2A,0x07,0x85,0x1F,0x0E,0x07,
0xA6,0x3F,0x26,0x07,0x7C,0x24,0x14,0x07,0x78,0x22,0x16,0x04,0x46,0x12,0x0A,0x02,
0xA6,0x41,0x2C,0x0A,0x7E,0x28,0x11,0x05,0x73,0x1B,0x14,0x05,0x3D,0x11,0x0A,0x02,
0x70,0x22,0x17,0x05,0x48,0x13,0x08,0x03,0x3C,0x07,0x0D,0x07,0x26,0x07,0x06,0x01,
0xE0,0x9F,0xDA,0x7C,0x4F,0x18,0x28,0x0D,0xE9,0x9F,0xDA,0x7C,0x4F,0x18,0x1F,0x07,
0xE6,0x97,0xD8,0x72,0x64,0x13,0x26,0x09,0xDC,0x67,0xA9,0x38,0x21,0x07,0x15,0x06,
0xE9,0x91,0xD2,0x6B,0x63,0x14,0x2B,0x0E,0xD6,0x61,0xB7,0x41,0x2B,0x0E,0x10,0x09,
0xCF,0x59,0xB0,0x2F,0x35,0x08,0x0F,0x07,0xB6,0x30,0x7A,0x21,0x17,0x07,0x09,0x03,
0xE7,0xA3,0xE5,0x6B,0x65,0x1F,0x34,0x09,0xD8,0x6B,0xBE,0x45,0x27,0x07,0x10,0x07,
0xDA,0x54,0xB1,0x39,0x2E,0x0E,0x17,0x08,0xA9,0x3C,0x86,0x22,0x16,0x06,0x07,0x03,
0xD4,0x51,0xBC,0x3D,0x38,0x0A,0x13,0x06,0xB2,0x37,0x79,0x1C,0x17,0x05,0x0E,0x06,
0xA7,0x31,0x74,0x1C,0x11,0x06,0x0C,0x02,0x6D,0x1A,0x38,0x10,0x0B,0x05,0x06,0x03,
0xEB,0x9A,0xE1,0x7A,0x6F,0x13,0x34,0x0E,0xE6,0x75,0xC5,0x45,0x3E,0x0B,0x1A,0x05,
0xD8,0x63,0xC1,0x40,0x3C,0x1B,0x19,0x06,0xB3,0x42,0x83,0x29,0x18,0x0A,0x08,0x04,
0xD4,0x58,0xBA,0x43,0x3F,0x0A,0x1F,0x09,0xB1,0x33,0x8A,0x1F,0x1F,0x06,0x0D,0x05,
0xAF,0x3C,0x7A,0x1F,0x16,0x08,0x0A,0x01,0x72,0x1B,0x52,0x0D,0x0B,0x09,0x06,0x01,
0xCF,0x63,0xB7,0x47,0x40,0x10,0x14,0x06,0xC0,0x41,0x96,0x20,0x1C,0x09,0x10,0x05,
0xA6,0x35,0x82,0x1A,0x20,0x0C,0x0E,0x04,0x80,0x1F,0x53,0x0F,0x0B,0x02,0x06,0x01,
0xA6,0x31,0x81,0x1B,0x1D,0x01,0x08,0x08,0x7B,0x20,0x4D,0x19,0x0E,0x05,0x07,0x03,
0x6B,0x17,0x49,0x07,0x0E,0x03,0x0A,0x05,0x37,0x0B,0x1F,0x06,0x04,0x02,0x07,0x01,
0xF0,0xD6,0xED,0xAD,0xEC,0xB1,0xEB,0x79,0xAC,0x22,0x47,0x1E,0x6E,0x1B,0x32,0x0A,
0xF0,0xD6,0xEA,0xA4,0xED,0xC4,0xDE,0x82,0x98,0x1F,0x50,0x13,0x52,0x15,0x2A,0x0A,
0xF1,0xD1,0xEB,0xA2,0xEB,0xB7,0xD8,0x69,0xA2,0x1F,0x5B,0x18,0x55,0x18,0x2C,0x0A,
0xED,0xB5,0xDE,0x7E,0xE6,0x85,0xD3,0x59,0x59,0x0F,0x2C,0x09,0x24,0x07,0x15,0x09,
0xF1,0xD6,0xEA,0xA0,0xEC,0xBB,0xDA,0x77,0xA9,0x23,0x58,0x14,0x5D,0x12,0x2F,0x09,
0xF1,0xC1,0xE3,0x86,0xE4,0x87,0xD2,0x4E,0x68,0x15,0x26,0x0B,0x27,0x09,0x15,0x02,
0xEE,0xA6,0xE0,0x5C,0xE0,0x77,0xC3,0x41,0x67,0x1B,0x3C,0x07,0x2A,0x06,0x19,0x07,
0xE4,0x75,0xC6,0x43,0xCC,0x50,0x95,0x23,0x35,0x09,0x14,0x04,0x15,0x05,0x0B,0x04,
0xEE,0xD6,0xED,0xAD,0xEC,0xB1,0xEB,0x79,0xAC,0x22,0x56,0x14,0x5A,0x12,0x26,0x0A,
0xEE,0xBB,0xE7,0x7E,0xE9,0x8D,0xCB,0x49,0x67,0x11,0x34,0x07,0x2B,0x0B,0x14,0x07,
0xED,0xA7,0xE5,0x76,0xE3,0x7E,0xC4,0x4B,0x77,0x14,0x34,0x08,0x27,0x07,0x14,0x04,
0xE7,0x8B,0xD2,0x4C,0xCA,0x56,0x9E,0x31,0x36,0x0C,0x11,0x07,0x14,0x04,0x0A,0x02,
0xF0,0x9B,0xEA,0x6F,0xE5,0x81,0xC4,0x43,0x74,0x10,0x30,0x0B,0x2D,0x08,0x1B,0x06,
0xE6,0x83,0xCA,0x48,0xD9,0x56,0xA7,0x23,0x3B,0x09,0x12,0x09,0x15,0x07,0x0A,0x03,
0xE5,0x5F,0xCB,0x3C,0xCF,0x48,0x91,0x22,0x31,0x0A,0x17,0x08,0x15,0x04,0x0D,0x02,
0xD1,0x43,0x91,0x20,0xA9,0x2D,0x54,0x12,0x17,0x07,0x09,0x02,0x0C,0x04,0x05,0x03,
};
#endif
// divided into multiple functions to keep rarely-used functionality separate
// so often-used functionality can be optimized better by compiler
// If write isn't preceded by read, data has this added to it
int const no_read_before_write = 0x2000;
void SNES_SPC::cpu_write_smp_reg_( int data, rel_time_t time, int addr )
{
switch ( addr )
{
case r_t0target:
case r_t1target:
case r_t2target: {
Timer* t = &m.timers [addr - r_t0target];
int period = IF_0_THEN_256( data );
if ( t->period != period )
{
t = run_timer( t, time );
#if SPC_MORE_ACCURACY
// Insane behavior when target is written just after counter is
// clocked and counter matches new period and new period isn't 1, 2, 4, or 8
if ( t->divider == (period & 0xFF) &&
t->next_time == time + TIMER_MUL( t, 1 ) &&
((period - 1) | ~0x0F) & period )
{
//dprintf( "SPC pathological timer target write\n" );
// If the period is 3, 5, or 9, there's a probability this behavior won't occur,
// based on the previous period
int prob = 0xFF;
int old_period = t->period & 0xFF;
if ( period == 3 ) prob = glitch_probs [0] [old_period];
if ( period == 5 ) prob = glitch_probs [1] [old_period];
if ( period == 9 ) prob = glitch_probs [2] [old_period];
// The glitch suppresses incrementing of one of the counter bits, based on
// the lowest set bit in the new period
int b = 1;
while ( !(period & b) )
b <<= 1;
if ( (rand() >> 4 & 0xFF) <= prob )
t->divider = (t->divider - b) & 0xFF;
}
#endif
t->period = period;
}
break;
}
case r_t0out:
case r_t1out:
case r_t2out:
if ( !SPC_MORE_ACCURACY )
dprintf( "SPC wrote to counter %d\n", (int) addr - r_t0out );
if ( data < no_read_before_write / 2 )
run_timer( &m.timers [addr - r_t0out], time - 1 )->counter = 0;
break;
// Registers that act like RAM
case 0x8:
case 0x9:
REGS_IN [addr] = (uint8_t) data;
break;
case r_test:
if ( (uint8_t) data != 0x0A )
dprintf( "SPC wrote to test register\n" );
break;
case r_control:
// port clears
if ( data & 0x10 )
{
REGS_IN [r_cpuio0] = 0;
REGS_IN [r_cpuio1] = 0;
}
if ( data & 0x20 )
{
REGS_IN [r_cpuio2] = 0;
REGS_IN [r_cpuio3] = 0;
}
// timers
{
for ( int i = 0; i < timer_count; i++ )
{
Timer* t = &m.timers [i];
int enabled = data >> i & 1;
if ( t->enabled != enabled )
{
t = run_timer( t, time );
t->enabled = enabled;
if ( enabled )
{
t->divider = 0;
t->counter = 0;
}
}
}
}
enable_rom( data & 0x80 );
break;
}
}
void SNES_SPC::cpu_write_smp_reg( int data, rel_time_t time, int addr )
{
if ( addr == r_dspdata ) // 99%
dsp_write( data, time );
else
cpu_write_smp_reg_( data, time, addr );
}
void SNES_SPC::cpu_write_high( int data, int i, rel_time_t time )
{
if ( i < rom_size )
{
m.hi_ram [i] = (uint8_t) data;
if ( m.rom_enabled )
RAM [i + rom_addr] = m.rom [i]; // restore overwritten ROM
}
else
{
assert( RAM [i + rom_addr] == (uint8_t) data );
RAM [i + rom_addr] = cpu_pad_fill; // restore overwritten padding
cpu_write( data, i + rom_addr - 0x10000, time );
}
}
int const bits_in_int = CHAR_BIT * sizeof (int);
void SNES_SPC::cpu_write( int data, int addr, rel_time_t time )
{
MEM_ACCESS( time, addr )
// RAM
RAM [addr] = (uint8_t) data;
int reg = addr - 0xF0;
if ( reg >= 0 ) // 64%
{
// $F0-$FF
if ( reg < reg_count ) // 87%
{
REGS [reg] = (uint8_t) data;
// Ports
#ifdef SPC_PORT_WRITE_HOOK
if ( (unsigned) (reg - r_cpuio0) < port_count )
SPC_PORT_WRITE_HOOK( m.spc_time + time, (reg - r_cpuio0),
(uint8_t) data, &REGS [r_cpuio0] );
#endif
// Registers other than $F2 and $F4-$F7
//if ( reg != 2 && reg != 4 && reg != 5 && reg != 6 && reg != 7 )
// TODO: this is a bit on the fragile side
if ( ((~0x2F00 << (bits_in_int - 16)) << reg) < 0 ) // 36%
cpu_write_smp_reg( data, time, reg );
}
// High mem/address wrap-around
else
{
reg -= rom_addr - 0xF0;
if ( reg >= 0 ) // 1% in IPL ROM area or address wrapped around
cpu_write_high( data, reg, time );
}
}
}
//// CPU read
inline int SNES_SPC::cpu_read_smp_reg( int reg, rel_time_t time )
{
int result = REGS_IN [reg];
reg -= r_dspaddr;
// DSP addr and data
if ( (unsigned) reg <= 1 ) // 4% 0xF2 and 0xF3
{
result = REGS [r_dspaddr];
if ( (unsigned) reg == 1 )
result = dsp_read( time ); // 0xF3
}
return result;
}
int SNES_SPC::cpu_read( int addr, rel_time_t time )
{
MEM_ACCESS( time, addr )
// RAM
int result = RAM [addr];
int reg = addr - 0xF0;
if ( reg >= 0 ) // 40%
{
reg -= 0x10;
if ( (unsigned) reg >= 0xFF00 ) // 21%
{
reg += 0x10 - r_t0out;
// Timers
if ( (unsigned) reg < timer_count ) // 90%
{
Timer* t = &m.timers [reg];
if ( time >= t->next_time )
t = run_timer_( t, time );
result = t->counter;
t->counter = 0;
}
// Other registers
else if ( reg < 0 ) // 10%
{
result = cpu_read_smp_reg( reg + r_t0out, time );
}
else // 1%
{
assert( reg + (r_t0out + 0xF0 - 0x10000) < 0x100 );
result = cpu_read( reg + (r_t0out + 0xF0 - 0x10000), time );
}
}
}
return result;
}
//// Run
// Prefix and suffix for CPU emulator function
#define SPC_CPU_RUN_FUNC \
BOOST::uint8_t* SNES_SPC::run_until_( time_t end_time )\
{\
rel_time_t rel_time = m.spc_time - end_time;\
assert( rel_time <= 0 );\
m.spc_time = end_time;\
m.dsp_time += rel_time;\
m.timers [0].next_time += rel_time;\
m.timers [1].next_time += rel_time;\
m.timers [2].next_time += rel_time;
#define SPC_CPU_RUN_FUNC_END \
m.spc_time += rel_time;\
m.dsp_time -= rel_time;\
m.timers [0].next_time -= rel_time;\
m.timers [1].next_time -= rel_time;\
m.timers [2].next_time -= rel_time;\
assert( m.spc_time <= end_time );\
return &REGS [r_cpuio0];\
}
int const cpu_lag_max = 12 - 1; // DIV YA,X takes 12 clocks
void SNES_SPC::end_frame( time_t end_time )
{
// Catch CPU up to as close to end as possible. If final instruction
// would exceed end, does NOT execute it and leaves m.spc_time < end.
if ( end_time > m.spc_time )
run_until_( end_time );
m.spc_time -= end_time;
m.extra_clocks += end_time;
// Greatest number of clocks early that emulation can stop early due to
// not being able to execute current instruction without going over
// allowed time.
assert( -cpu_lag_max <= m.spc_time && m.spc_time <= 0 );
// Catch timers up to CPU
for ( int i = 0; i < timer_count; i++ )
run_timer( &m.timers [i], 0 );
// Catch DSP up to CPU
if ( m.dsp_time < 0 )
{
RUN_DSP( 0, max_reg_time );
}
// Save any extra samples beyond what should be generated
if ( m.buf_begin )
save_extra();
}
// Inclusion here allows static memory access functions and better optimization
#include "SPC_CPU.h"

284
waterbox/sameboy/snes_spc/SNES_SPC.h
View File

@ -1,284 +0,0 @@
// SNES SPC-700 APU emulator
// snes_spc 0.9.0
#ifndef SNES_SPC_H
#define SNES_SPC_H
#include "SPC_DSP.h"
#include "blargg_endian.h"
#include <stdint.h>
struct SNES_SPC {
public:
typedef BOOST::uint8_t uint8_t;
// Must be called once before using
blargg_err_t init();
// Sample pairs generated per second
enum { sample_rate = 32000 };
// Emulator use
// Sets IPL ROM data. Library does not include ROM data. Most SPC music files
// don't need ROM, but a full emulator must provide this.
enum { rom_size = 0x40 };
void init_rom( uint8_t const rom [rom_size] );
// Sets destination for output samples
typedef short sample_t;
void set_output( sample_t* out, int out_size );
// Number of samples written to output since last set
int sample_count() const;
// Resets SPC to power-on state. This resets your output buffer, so you must
// call set_output() after this.
void reset();
// Emulates pressing reset switch on SNES. This resets your output buffer, so
// you must call set_output() after this.
void soft_reset();
// 1024000 SPC clocks per second, sample pair every 32 clocks
typedef int time_t;
enum { clock_rate = 1024000 };
enum { clocks_per_sample = 32 };
// Emulated port read/write at specified time
enum { port_count = 4 };
int read_port ( time_t, int port );
void write_port( time_t, int port, int data );
// Runs SPC to end_time and starts a new time frame at 0
void end_frame( time_t end_time );
uint8_t* get_ram();
// Sound control
// Mutes voices corresponding to non-zero bits in mask (issues repeated KOFF events).
// Reduces emulation accuracy.
enum { voice_count = 8 };
void mute_voices( int mask );
// If true, prevents channels and global volumes from being phase-negated.
// Only supported by fast DSP.
void disable_surround( bool disable = true );
// Sets tempo, where tempo_unit = normal, tempo_unit / 2 = half speed, etc.
enum { tempo_unit = 0x100 };
void set_tempo( int );
// SPC music files
// Loads SPC data into emulator
enum { spc_min_file_size = 0x10180 };
enum { spc_file_size = 0x10200 };
blargg_err_t load_spc( void const* in, long size );
// Clears echo region. Useful after loading an SPC as many have garbage in echo.
void clear_echo();
// Plays for count samples and write samples to out. Discards samples if out
// is NULL. Count must be a multiple of 2 since output is stereo.
blargg_err_t play( int count, sample_t* out );
// Skips count samples. Several times faster than play() when using fast DSP.
blargg_err_t skip( int count );
// State save/load (only available with accurate DSP)
#if !SPC_NO_COPY_STATE_FUNCS
// Saves/loads state
enum { state_size = 67 * 1024L }; // maximum space needed when saving
typedef SPC_DSP::copy_func_t copy_func_t;
void copy_state( unsigned char** io, copy_func_t );
// Writes minimal header to spc_out
static void init_header( void* spc_out );
// Saves emulator state as SPC file data. Writes spc_file_size bytes to spc_out.
// Does not set up SPC header; use init_header() for that.
void save_spc( void* spc_out );
// Returns true if new key-on events occurred since last check. Useful for
// trimming silence while saving an SPC.
bool check_kon();
#endif
public:
BLARGG_DISABLE_NOTHROW
typedef BOOST::uint16_t uint16_t;
// Time relative to m_spc_time. Speeds up code a bit by eliminating need to
// constantly add m_spc_time to time from CPU. CPU uses time that ends at
// 0 to eliminate reloading end time every instruction. It pays off.
typedef int rel_time_t;
struct Timer
{
rel_time_t next_time; // time of next event
int prescaler;
int period;
int divider;
int enabled;
int counter;
};
enum { reg_count = 0x10 };
enum { timer_count = 3 };
enum { extra_size = SPC_DSP::extra_size };
enum { signature_size = 35 };
private:
SPC_DSP dsp;
#if SPC_LESS_ACCURATE
static signed char const reg_times_ [256];
signed char reg_times [256];
#endif
struct state_t
{
Timer timers [timer_count];
uint8_t smp_regs [2] [reg_count];
struct
{
int pc;
int a;
int x;
int y;
int psw;
int sp;
} cpu_regs;
rel_time_t dsp_time;
time_t spc_time;
bool echo_accessed;
int tempo;
int skipped_kon;
int skipped_koff;
const char* cpu_error;
int extra_clocks;
sample_t* buf_begin;
sample_t const* buf_end;
sample_t* extra_pos;
sample_t extra_buf [extra_size];
int rom_enabled;
uint8_t rom [rom_size];
uint8_t hi_ram [rom_size];
unsigned char cycle_table [256];
struct
{
// padding to neutralize address overflow
union {
uint8_t padding1 [0x100];
uint16_t align; // makes compiler align data for 16-bit access
} padding1 [1];
uint8_t ram [0x10000];
uint8_t padding2 [0x100];
} ram;
};
state_t m;
enum { rom_addr = 0xFFC0 };
enum { skipping_time = 127 };
// Value that padding should be filled with
enum { cpu_pad_fill = 0xFF };
enum {
r_test = 0x0, r_control = 0x1,
r_dspaddr = 0x2, r_dspdata = 0x3,
r_cpuio0 = 0x4, r_cpuio1 = 0x5,
r_cpuio2 = 0x6, r_cpuio3 = 0x7,
r_f8 = 0x8, r_f9 = 0x9,
r_t0target = 0xA, r_t1target = 0xB, r_t2target = 0xC,
r_t0out = 0xD, r_t1out = 0xE, r_t2out = 0xF
};
void timers_loaded();
void enable_rom( int enable );
void reset_buf();
void save_extra();
void load_regs( uint8_t const in [reg_count] );
void ram_loaded();
void regs_loaded();
void reset_time_regs();
void reset_common( int timer_counter_init );
Timer* run_timer_ ( Timer* t, rel_time_t );
Timer* run_timer ( Timer* t, rel_time_t );
int dsp_read ( rel_time_t );
void dsp_write ( int data, rel_time_t );
void cpu_write_smp_reg_( int data, rel_time_t, int addr );
void cpu_write_smp_reg ( int data, rel_time_t, int addr );
void cpu_write_high ( int data, int i, rel_time_t );
void cpu_write ( int data, int addr, rel_time_t );
int cpu_read_smp_reg ( int i, rel_time_t );
int cpu_read ( int addr, rel_time_t );
unsigned CPU_mem_bit ( uint8_t const* pc, rel_time_t );
bool check_echo_access ( int addr );
uint8_t* run_until_( time_t end_time );
struct spc_file_t
{
char signature [signature_size];
uint8_t has_id666;
uint8_t version;
uint8_t pcl, pch;
uint8_t a;
uint8_t x;
uint8_t y;
uint8_t psw;
uint8_t sp;
char text [212];
uint8_t ram [0x10000];
uint8_t dsp [128];
uint8_t unused [0x40];
uint8_t ipl_rom [0x40];
};
static char const signature [signature_size + 1];
void save_regs( uint8_t out [reg_count] );
};
#include <assert.h>
inline uint8_t* SNES_SPC::get_ram() { return m.ram.ram; }
inline int SNES_SPC::sample_count() const { return (m.extra_clocks >> 5) * 2; }
inline int SNES_SPC::read_port( time_t t, int port )
{
assert( (unsigned) port < port_count );
return run_until_( t ) [port];
}
inline void SNES_SPC::write_port( time_t t, int port, int data )
{
assert( (unsigned) port < port_count );
run_until_( t ) [0x10 + port] = data;
}
inline void SNES_SPC::mute_voices( int mask ) { dsp.mute_voices( mask ); }
inline void SNES_SPC::disable_surround( bool disable ) { dsp.disable_surround( disable ); }
#if !SPC_NO_COPY_STATE_FUNCS
inline bool SNES_SPC::check_kon() { return dsp.check_kon(); }
#endif
#endif

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// SPC emulation support: init, sample buffering, reset, SPC loading
// snes_spc 0.9.0. http://www.slack.net/~ant/
#include "SNES_SPC.h"
#include <string.h>
/* Copyright (C) 2004-2007 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details. You should have received a copy of the GNU Lesser General Public
License along with this module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
#include "blargg_source.h"
#define RAM (m.ram.ram)
#define REGS (m.smp_regs [0])
#define REGS_IN (m.smp_regs [1])
// (n ? n : 256)
#define IF_0_THEN_256( n ) ((uint8_t) ((n) - 1) + 1)
//// Init
blargg_err_t SNES_SPC::init()
{
memset( &m, 0, sizeof m );
dsp.init( RAM );
m.tempo = tempo_unit;
// Most SPC music doesn't need ROM, and almost all the rest only rely
// on these two bytes
m.rom [0x3E] = 0xFF;
m.rom [0x3F] = 0xC0;
static unsigned char const cycle_table [128] =
{// 01 23 45 67 89 AB CD EF
0x28,0x47,0x34,0x36,0x26,0x54,0x54,0x68, // 0
0x48,0x47,0x45,0x56,0x55,0x65,0x22,0x46, // 1
0x28,0x47,0x34,0x36,0x26,0x54,0x54,0x74, // 2
0x48,0x47,0x45,0x56,0x55,0x65,0x22,0x38, // 3
0x28,0x47,0x34,0x36,0x26,0x44,0x54,0x66, // 4
0x48,0x47,0x45,0x56,0x55,0x45,0x22,0x43, // 5
0x28,0x47,0x34,0x36,0x26,0x44,0x54,0x75, // 6
0x48,0x47,0x45,0x56,0x55,0x55,0x22,0x36, // 7
0x28,0x47,0x34,0x36,0x26,0x54,0x52,0x45, // 8
0x48,0x47,0x45,0x56,0x55,0x55,0x22,0xC5, // 9
0x38,0x47,0x34,0x36,0x26,0x44,0x52,0x44, // A
0x48,0x47,0x45,0x56,0x55,0x55,0x22,0x34, // B
0x38,0x47,0x45,0x47,0x25,0x64,0x52,0x49, // C
0x48,0x47,0x56,0x67,0x45,0x55,0x22,0x83, // D
0x28,0x47,0x34,0x36,0x24,0x53,0x43,0x40, // E
0x48,0x47,0x45,0x56,0x34,0x54,0x22,0x60, // F
};
// unpack cycle table
for ( int i = 0; i < 128; i++ )
{
int n = cycle_table [i];
m.cycle_table [i * 2 + 0] = n >> 4;
m.cycle_table [i * 2 + 1] = n & 0x0F;
}
#if SPC_LESS_ACCURATE
memcpy( reg_times, reg_times_, sizeof reg_times );
#endif
reset();
return 0;
}
void SNES_SPC::init_rom( uint8_t const in [rom_size] )
{
memcpy( m.rom, in, sizeof m.rom );
}
void SNES_SPC::set_tempo( int t )
{
m.tempo = t;
int const timer2_shift = 4; // 64 kHz
int const other_shift = 3; // 8 kHz
#if SPC_DISABLE_TEMPO
m.timers [2].prescaler = timer2_shift;
m.timers [1].prescaler = timer2_shift + other_shift;
m.timers [0].prescaler = timer2_shift + other_shift;
#else
if ( !t )
t = 1;
int const timer2_rate = 1 << timer2_shift;
int rate = (timer2_rate * tempo_unit + (t >> 1)) / t;
if ( rate < timer2_rate / 4 )
rate = timer2_rate / 4; // max 4x tempo
m.timers [2].prescaler = rate;
m.timers [1].prescaler = rate << other_shift;
m.timers [0].prescaler = rate << other_shift;
#endif
}
// Timer registers have been loaded. Applies these to the timers. Does not
// reset timer prescalers or dividers.
void SNES_SPC::timers_loaded()
{
int i;
for ( i = 0; i < timer_count; i++ )
{
Timer* t = &m.timers [i];
t->period = IF_0_THEN_256( REGS [r_t0target + i] );
t->enabled = REGS [r_control] >> i & 1;
t->counter = REGS_IN [r_t0out + i] & 0x0F;
}
set_tempo( m.tempo );
}
// Loads registers from unified 16-byte format
void SNES_SPC::load_regs( uint8_t const in [reg_count] )
{
memcpy( REGS, in, reg_count );
memcpy( REGS_IN, REGS, reg_count );
// These always read back as 0
REGS_IN [r_test ] = 0;
REGS_IN [r_control ] = 0;
REGS_IN [r_t0target] = 0;
REGS_IN [r_t1target] = 0;
REGS_IN [r_t2target] = 0;
}
// RAM was just loaded from SPC, with $F0-$FF containing SMP registers
// and timer counts. Copies these to proper registers.
void SNES_SPC::ram_loaded()
{
m.rom_enabled = 0;
load_regs( &RAM [0xF0] );
// Put STOP instruction around memory to catch PC underflow/overflow
memset( m.ram.padding1, cpu_pad_fill, sizeof m.ram.padding1 );
memset( m.ram.padding2, cpu_pad_fill, sizeof m.ram.padding2 );
}
// Registers were just loaded. Applies these new values.
void SNES_SPC::regs_loaded()
{
enable_rom( REGS [r_control] & 0x80 );
timers_loaded();
}
void SNES_SPC::reset_time_regs()
{
m.cpu_error = 0;
m.echo_accessed = 0;
m.spc_time = 0;
m.dsp_time = 0;
#if SPC_LESS_ACCURATE
m.dsp_time = clocks_per_sample + 1;
#endif
for ( int i = 0; i < timer_count; i++ )
{
Timer* t = &m.timers [i];
t->next_time = 1;
t->divider = 0;
}
regs_loaded();
m.extra_clocks = 0;
reset_buf();
}
void SNES_SPC::reset_common( int timer_counter_init )
{
int i;
for ( i = 0; i < timer_count; i++ )
REGS_IN [r_t0out + i] = timer_counter_init;
// Run IPL ROM
memset( &m.cpu_regs, 0, sizeof m.cpu_regs );
m.cpu_regs.pc = rom_addr;
REGS [r_test ] = 0x0A;
REGS [r_control] = 0xB0; // ROM enabled, clear ports
for ( i = 0; i < port_count; i++ )
REGS_IN [r_cpuio0 + i] = 0;
reset_time_regs();
}
void SNES_SPC::soft_reset()
{
reset_common( 0 );
dsp.soft_reset();
}
void SNES_SPC::reset()
{
memset( RAM, 0xFF, 0x10000 );
ram_loaded();
reset_common( 0x0F );
dsp.reset();
}
char const SNES_SPC::signature [signature_size + 1] =
"SNES-SPC700 Sound File Data v0.30\x1A\x1A";
blargg_err_t SNES_SPC::load_spc( void const* data, long size )
{
spc_file_t const* const spc = (spc_file_t const*) data;
// be sure compiler didn't insert any padding into fle_t
assert( sizeof (spc_file_t) == spc_min_file_size + 0x80 );
// Check signature and file size
if ( size < signature_size || memcmp( spc, signature, 27 ) )
return "Not an SPC file";
if ( size < spc_min_file_size )
return "Corrupt SPC file";
// CPU registers
m.cpu_regs.pc = spc->pch * 0x100 + spc->pcl;
m.cpu_regs.a = spc->a;
m.cpu_regs.x = spc->x;
m.cpu_regs.y = spc->y;
m.cpu_regs.psw = spc->psw;
m.cpu_regs.sp = spc->sp;
// RAM and registers
memcpy( RAM, spc->ram, 0x10000 );
ram_loaded();
// DSP registers
dsp.load( spc->dsp );
reset_time_regs();
return 0;
}
void SNES_SPC::clear_echo()
{
if ( !(dsp.read( SPC_DSP::r_flg ) & 0x20) )
{
int addr = 0x100 * dsp.read( SPC_DSP::r_esa );
int end = addr + 0x800 * (dsp.read( SPC_DSP::r_edl ) & 0x0F);
if ( end > 0x10000 )
end = 0x10000;
memset( &RAM [addr], 0xFF, end - addr );
}
}
//// Sample output
void SNES_SPC::reset_buf()
{
// Start with half extra buffer of silence
sample_t* out = m.extra_buf;
while ( out < &m.extra_buf [extra_size / 2] )
*out++ = 0;
m.extra_pos = out;
m.buf_begin = 0;
dsp.set_output( 0, 0 );
}
void SNES_SPC::set_output( sample_t* out, int size )
{
require( (size & 1) == 0 ); // size must be even
m.extra_clocks &= clocks_per_sample - 1;
if ( out )
{
sample_t const* out_end = out + size;
m.buf_begin = out;
m.buf_end = out_end;
// Copy extra to output
sample_t const* in = m.extra_buf;
while ( in < m.extra_pos && out < out_end )
*out++ = *in++;
// Handle output being full already
if ( out >= out_end )
{
// Have DSP write to remaining extra space
out = dsp.extra();
out_end = &dsp.extra() [extra_size];
// Copy any remaining extra samples as if DSP wrote them
while ( in < m.extra_pos )
*out++ = *in++;
assert( out <= out_end );
}
dsp.set_output( out, out_end - out );
}
else
{
reset_buf();
}
}
void SNES_SPC::save_extra()
{
// Get end pointers
sample_t const* main_end = m.buf_end; // end of data written to buf
sample_t const* dsp_end = dsp.out_pos(); // end of data written to dsp.extra()
if ( m.buf_begin <= dsp_end && dsp_end <= main_end )
{
main_end = dsp_end;
dsp_end = dsp.extra(); // nothing in DSP's extra
}
// Copy any extra samples at these ends into extra_buf
sample_t* out = m.extra_buf;
sample_t const* in;
for ( in = m.buf_begin + sample_count(); in < main_end; in++ )
*out++ = *in;
for ( in = dsp.extra(); in < dsp_end ; in++ )
*out++ = *in;
m.extra_pos = out;
assert( out <= &m.extra_buf [extra_size] );
}
blargg_err_t SNES_SPC::play( int count, sample_t* out )
{
require( (count & 1) == 0 ); // must be even
if ( count )
{
set_output( out, count );
end_frame( count * (clocks_per_sample / 2) );
}
const char* err = m.cpu_error;
m.cpu_error = 0;
return err;
}
blargg_err_t SNES_SPC::skip( int count )
{
#if SPC_LESS_ACCURATE
if ( count > 2 * sample_rate * 2 )
{
set_output( 0, 0 );
// Skip a multiple of 4 samples
time_t end = count;
count = (count & 3) + 1 * sample_rate * 2;
end = (end - count) * (clocks_per_sample / 2);
m.skipped_kon = 0;
m.skipped_koff = 0;
// Preserve DSP and timer synchronization
// TODO: verify that this really preserves it
int old_dsp_time = m.dsp_time + m.spc_time;
m.dsp_time = end - m.spc_time + skipping_time;
end_frame( end );
m.dsp_time = m.dsp_time - skipping_time + old_dsp_time;
dsp.write( SPC_DSP::r_koff, m.skipped_koff & ~m.skipped_kon );
dsp.write( SPC_DSP::r_kon , m.skipped_kon );
clear_echo();
}
#endif
return play( count, 0 );
}

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// SPC emulation state save/load: copy_state(), save_spc()
// Separate file to avoid linking in unless needed
// snes_spc 0.9.0. http://www.slack.net/~ant/
#include "SNES_SPC.h"
#if !SPC_NO_COPY_STATE_FUNCS
#include <string.h>
/* Copyright (C) 2004-2007 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details. You should have received a copy of the GNU Lesser General Public
License along with this module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
#include "blargg_source.h"
#define RAM (m.ram.ram)
#define REGS (m.smp_regs [0])
#define REGS_IN (m.smp_regs [1])
void SNES_SPC::save_regs( uint8_t out [reg_count] )
{
// Use current timer counter values
for ( int i = 0; i < timer_count; i++ )
out [r_t0out + i] = m.timers [i].counter;
// Last written values
memcpy( out, REGS, r_t0out );
}
void SNES_SPC::init_header( void* spc_out )
{
spc_file_t* const spc = (spc_file_t*) spc_out;
spc->has_id666 = 26; // has none
spc->version = 30;
memcpy( spc, signature, sizeof spc->signature );
memset( spc->text, 0, sizeof spc->text );
}
void SNES_SPC::save_spc( void* spc_out )
{
spc_file_t* const spc = (spc_file_t*) spc_out;
// CPU
spc->pcl = (uint8_t) (m.cpu_regs.pc >> 0);
spc->pch = (uint8_t) (m.cpu_regs.pc >> 8);
spc->a = m.cpu_regs.a;
spc->x = m.cpu_regs.x;
spc->y = m.cpu_regs.y;
spc->psw = m.cpu_regs.psw;
spc->sp = m.cpu_regs.sp;
// RAM, ROM
memcpy( spc->ram, RAM, sizeof spc->ram );
if ( m.rom_enabled )
memcpy( spc->ram + rom_addr, m.hi_ram, sizeof m.hi_ram );
memset( spc->unused, 0, sizeof spc->unused );
memcpy( spc->ipl_rom, m.rom, sizeof spc->ipl_rom );
// SMP registers
save_regs( &spc->ram [0xF0] );
int i;
for ( i = 0; i < port_count; i++ )
spc->ram [0xF0 + r_cpuio0 + i] = REGS_IN [r_cpuio0 + i];
// DSP registers
for ( i = 0; i < SPC_DSP::register_count; i++ )
spc->dsp [i] = dsp.read( i );
}
void SNES_SPC::copy_state( unsigned char** io, copy_func_t copy )
{
SPC_State_Copier copier( io, copy );
// Make state data more readable by putting 64K RAM, 16 SMP registers,
// then DSP (with its 128 registers) first
// RAM
enable_rom( 0 ); // will get re-enabled if necessary in regs_loaded() below
copier.copy( RAM, 0x10000 );
{
// SMP registers
uint8_t out_ports [port_count];
uint8_t regs [reg_count];
memcpy( out_ports, &REGS [r_cpuio0], sizeof out_ports );
save_regs( regs );
copier.copy( regs, sizeof regs );
copier.copy( out_ports, sizeof out_ports );
load_regs( regs );
regs_loaded();
memcpy( &REGS [r_cpuio0], out_ports, sizeof out_ports );
}
// CPU registers
SPC_COPY( uint16_t, m.cpu_regs.pc );
SPC_COPY( uint8_t, m.cpu_regs.a );
SPC_COPY( uint8_t, m.cpu_regs.x );
SPC_COPY( uint8_t, m.cpu_regs.y );
SPC_COPY( uint8_t, m.cpu_regs.psw );
SPC_COPY( uint8_t, m.cpu_regs.sp );
copier.extra();
SPC_COPY( int16_t, m.spc_time );
SPC_COPY( int16_t, m.dsp_time );
// DSP
dsp.copy_state( io, copy );
// Timers
for ( int i = 0; i < timer_count; i++ )
{
Timer* t = &m.timers [i];
SPC_COPY( int16_t, t->next_time );
SPC_COPY( uint8_t, t->divider );
copier.extra();
}
copier.extra();
}
#endif

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// Highly accurate SNES SPC-700 DSP emulator
// snes_spc 0.9.0
#ifndef SPC_DSP_H
#define SPC_DSP_H
#include "blargg_common.h"
extern "C" { typedef void (*dsp_copy_func_t)( unsigned char** io, void* state, size_t ); }
class SPC_DSP {
public:
typedef BOOST::uint8_t uint8_t;
// Setup
// Initializes DSP and has it use the 64K RAM provided
void init( void* ram_64k );
// Sets destination for output samples. If out is NULL or out_size is 0,
// doesn't generate any.
typedef short sample_t;
void set_output( sample_t* out, int out_size );
// Number of samples written to output since it was last set, always
// a multiple of 2. Undefined if more samples were generated than
// output buffer could hold.
int sample_count() const;
// Emulation
// Resets DSP to power-on state
void reset();
// Emulates pressing reset switch on SNES
void soft_reset();
// Reads/writes DSP registers. For accuracy, you must first call run()
// to catch the DSP up to present.
int read ( int addr ) const;
void write( int addr, int data );
// Runs DSP for specified number of clocks (~1024000 per second). Every 32 clocks
// a pair of samples is be generated.
void run( int clock_count );
// Sound control
// Mutes voices corresponding to non-zero bits in mask (issues repeated KOFF events).
// Reduces emulation accuracy.
enum { voice_count = 8 };
void mute_voices( int mask );
// State
// Resets DSP and uses supplied values to initialize registers
enum { register_count = 128 };
void load( uint8_t const regs [register_count] );
// Saves/loads exact emulator state
enum { state_size = 640 }; // maximum space needed when saving
typedef dsp_copy_func_t copy_func_t;
void copy_state( unsigned char** io, copy_func_t );
// Returns non-zero if new key-on events occurred since last call
bool check_kon();
// DSP register addresses
// Global registers
enum {
r_mvoll = 0x0C, r_mvolr = 0x1C,
r_evoll = 0x2C, r_evolr = 0x3C,
r_kon = 0x4C, r_koff = 0x5C,
r_flg = 0x6C, r_endx = 0x7C,
r_efb = 0x0D, r_pmon = 0x2D,
r_non = 0x3D, r_eon = 0x4D,
r_dir = 0x5D, r_esa = 0x6D,
r_edl = 0x7D,
r_fir = 0x0F // 8 coefficients at 0x0F, 0x1F ... 0x7F
};
// Voice registers
enum {
v_voll = 0x00, v_volr = 0x01,
v_pitchl = 0x02, v_pitchh = 0x03,
v_srcn = 0x04, v_adsr0 = 0x05,
v_adsr1 = 0x06, v_gain = 0x07,
v_envx = 0x08, v_outx = 0x09
};
public:
enum { extra_size = 16 };
sample_t* extra() { return m.extra; }
sample_t const* out_pos() const { return m.out; }
void disable_surround( bool ) { } // not supported
public:
BLARGG_DISABLE_NOTHROW
typedef BOOST::int8_t int8_t;
typedef BOOST::int16_t int16_t;
enum { echo_hist_size = 8 };
enum env_mode_t { env_release, env_attack, env_decay, env_sustain };
enum { brr_buf_size = 12 };
struct voice_t
{
int buf [brr_buf_size*2];// decoded samples (twice the size to simplify wrap handling)
int buf_pos; // place in buffer where next samples will be decoded
int interp_pos; // relative fractional position in sample (0x1000 = 1.0)
int brr_addr; // address of current BRR block
int brr_offset; // current decoding offset in BRR block
uint8_t* regs; // pointer to voice's DSP registers
int vbit; // bitmask for voice: 0x01 for voice 0, 0x02 for voice 1, etc.
int kon_delay; // KON delay/current setup phase
env_mode_t env_mode;
int env; // current envelope level
int hidden_env; // used by GAIN mode 7, very obscure quirk
uint8_t t_envx_out;
};
private:
enum { brr_block_size = 9 };
struct state_t
{
uint8_t regs [register_count];
// Echo history keeps most recent 8 samples (twice the size to simplify wrap handling)
int echo_hist [echo_hist_size * 2] [2];
int (*echo_hist_pos) [2]; // &echo_hist [0 to 7]
int every_other_sample; // toggles every sample
int kon; // KON value when last checked
int noise;
int counter;
int echo_offset; // offset from ESA in echo buffer
int echo_length; // number of bytes that echo_offset will stop at
int phase; // next clock cycle to run (0-31)
bool kon_check; // set when a new KON occurs
// Hidden registers also written to when main register is written to
int new_kon;
uint8_t endx_buf;
uint8_t envx_buf;
uint8_t outx_buf;
// Temporary state between clocks
// read once per sample
int t_pmon;
int t_non;
int t_eon;
int t_dir;
int t_koff;
// read a few clocks ahead then used
int t_brr_next_addr;
int t_adsr0;
int t_brr_header;
int t_brr_byte;
int t_srcn;
int t_esa;
int t_echo_enabled;
// internal state that is recalculated every sample
int t_dir_addr;
int t_pitch;
int t_output;
int t_looped;
int t_echo_ptr;
// left/right sums
int t_main_out [2];
int t_echo_out [2];
int t_echo_in [2];
voice_t voices [voice_count];
// non-emulation state
uint8_t* ram; // 64K shared RAM between DSP and SMP
int mute_mask;
sample_t* out;
sample_t* out_end;
sample_t* out_begin;
sample_t extra [extra_size];
};
state_t m;
void init_counter();
void run_counters();
unsigned read_counter( int rate );
int interpolate( voice_t const* v );
void run_envelope( voice_t* const v );
void decode_brr( voice_t* v );
void misc_27();
void misc_28();
void misc_29();
void misc_30();
void voice_output( voice_t const* v, int ch );
void voice_V1( voice_t* const );
void voice_V2( voice_t* const );
void voice_V3( voice_t* const );
void voice_V3a( voice_t* const );
void voice_V3b( voice_t* const );
void voice_V3c( voice_t* const );
void voice_V4( voice_t* const );
void voice_V5( voice_t* const );
void voice_V6( voice_t* const );
void voice_V7( voice_t* const );
void voice_V8( voice_t* const );
void voice_V9( voice_t* const );
void voice_V7_V4_V1( voice_t* const );
void voice_V8_V5_V2( voice_t* const );
void voice_V9_V6_V3( voice_t* const );
void echo_read( int ch );
int echo_output( int ch );
void echo_write( int ch );
void echo_22();
void echo_23();
void echo_24();
void echo_25();
void echo_26();
void echo_27();
void echo_28();
void echo_29();
void echo_30();
void soft_reset_common();
};
#include <assert.h>
inline int SPC_DSP::sample_count() const { return m.out - m.out_begin; }
inline int SPC_DSP::read( int addr ) const
{
assert( (unsigned) addr < register_count );
return m.regs [addr];
}
inline void SPC_DSP::write( int addr, int data )
{
assert( (unsigned) addr < register_count );
m.regs [addr] = (uint8_t) data;
switch ( addr & 0x0F )
{
case v_envx:
m.envx_buf = (uint8_t) data;
break;
case v_outx:
m.outx_buf = (uint8_t) data;
break;
case 0x0C:
if ( addr == r_kon )
m.new_kon = (uint8_t) data;
if ( addr == r_endx ) // always cleared, regardless of data written
{
m.endx_buf = 0;
m.regs [r_endx] = 0;
}
break;
}
}
inline void SPC_DSP::mute_voices( int mask ) { m.mute_mask = mask; }
inline bool SPC_DSP::check_kon()
{
bool old = m.kon_check;
m.kon_check = 0;
return old;
}
#if !SPC_NO_COPY_STATE_FUNCS
class SPC_State_Copier {
SPC_DSP::copy_func_t func;
unsigned char** buf;
public:
SPC_State_Copier( unsigned char** p, SPC_DSP::copy_func_t f ) { func = f; buf = p; }
void copy( void* state, size_t size );
int copy_int( int state, int size );
void skip( int count );
void extra();
};
#define SPC_COPY( type, state )\
{\
state = (BOOST::type) copier.copy_int( state, sizeof (BOOST::type) );\
assert( (BOOST::type) state == state );\
}
#endif
#endif

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waterbox/sameboy/snes_spc/SPC_Filter.cpp
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// snes_spc 0.9.0. http://www.slack.net/~ant/
#include "SPC_Filter.h"
#include <string.h>
/* Copyright (C) 2007 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details. You should have received a copy of the GNU Lesser General Public
License along with this module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
#include "blargg_source.h"
void SPC_Filter::clear() { memset( ch, 0, sizeof ch ); }
SPC_Filter::SPC_Filter()
{
gain = gain_unit;
bass = bass_norm;
clear();
}
void SPC_Filter::run( short* io, int count )
{
require( (count & 1) == 0 ); // must be even
int const gain = this->gain;
int const bass = this->bass;
chan_t* c = &ch [2];
do
{
// cache in registers
int sum = (--c)->sum;
int pp1 = c->pp1;
int p1 = c->p1;
for ( int i = 0; i < count; i += 2 )
{
// Low-pass filter (two point FIR with coeffs 0.25, 0.75)
int f = io [i] + p1;
p1 = io [i] * 3;
// High-pass filter ("leaky integrator")
int delta = f - pp1;
pp1 = f;
int s = sum >> (gain_bits + 2);
sum += (delta * gain) - (sum >> bass);
// Clamp to 16 bits
if ( (short) s != s )
s = (s >> 31) ^ 0x7FFF;
io [i] = (short) s;
}
c->p1 = p1;
c->pp1 = pp1;
c->sum = sum;
++io;
}
while ( c != ch );
}

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waterbox/sameboy/snes_spc/SPC_Filter.h
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// Simple low-pass and high-pass filter to better match sound output of a SNES
// snes_spc 0.9.0
#ifndef SPC_FILTER_H
#define SPC_FILTER_H
#include "blargg_common.h"
struct SPC_Filter {
public:
// Filters count samples of stereo sound in place. Count must be a multiple of 2.
typedef short sample_t;
void run( sample_t* io, int count );
// Optional features
// Clears filter to silence
void clear();
// Sets gain (volume), where gain_unit is normal. Gains greater than gain_unit
// are fine, since output is clamped to 16-bit sample range.
enum { gain_unit = 0x100 };
void set_gain( int gain );
// Sets amount of bass (logarithmic scale)
enum { bass_none = 0 };
enum { bass_norm = 8 }; // normal amount
enum { bass_max = 31 };
void set_bass( int bass );
public:
SPC_Filter();
BLARGG_DISABLE_NOTHROW
private:
enum { gain_bits = 8 };
int gain;
int bass;
struct chan_t { int p1, pp1, sum; };
chan_t ch [2];
};
inline void SPC_Filter::set_gain( int g ) { gain = g; }
inline void SPC_Filter::set_bass( int b ) { bass = b; }
#endif

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waterbox/sameboy/snes_spc/blargg_common.h
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// Sets up common environment for Shay Green's libraries.
// To change configuration options, modify blargg_config.h, not this file.
// snes_spc 0.9.0
#ifndef BLARGG_COMMON_H
#define BLARGG_COMMON_H
#include <stddef.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#undef BLARGG_COMMON_H
// allow blargg_config.h to #include blargg_common.h
#include "blargg_config.h"
#ifndef BLARGG_COMMON_H
#define BLARGG_COMMON_H
// BLARGG_RESTRICT: equivalent to restrict, where supported
#if defined (__GNUC__) || _MSC_VER >= 1100
#define BLARGG_RESTRICT __restrict
#else
#define BLARGG_RESTRICT
#endif
// STATIC_CAST(T,expr): Used in place of static_cast<T> (expr)
#ifndef STATIC_CAST
#define STATIC_CAST(T,expr) ((T) (expr))
#endif
// blargg_err_t (0 on success, otherwise error string)
#ifndef blargg_err_t
typedef const char* blargg_err_t;
#endif
// blargg_vector - very lightweight vector of POD types (no constructor/destructor)
template<class T>
class blargg_vector {
T* begin_;
size_t size_;
public:
blargg_vector() : begin_( 0 ), size_( 0 ) { }
~blargg_vector() { free( begin_ ); }
size_t size() const { return size_; }
T* begin() const { return begin_; }
T* end() const { return begin_ + size_; }
blargg_err_t resize( size_t n )
{
// TODO: blargg_common.cpp to hold this as an outline function, ugh
void* p = realloc( begin_, n * sizeof (T) );
if ( p )
begin_ = (T*) p;
else if ( n > size_ ) // realloc failure only a problem if expanding
return "Out of memory";
size_ = n;
return 0;
}
void clear() { void* p = begin_; begin_ = 0; size_ = 0; free( p ); }
T& operator [] ( size_t n ) const
{
assert( n <= size_ ); // <= to allow past-the-end value
return begin_ [n];
}
};
#ifndef BLARGG_DISABLE_NOTHROW
// throw spec mandatory in ISO C++ if operator new can return NULL
#if __cplusplus >= 199711 || defined (__GNUC__)
#define BLARGG_THROWS( spec ) throw spec
#else
#define BLARGG_THROWS( spec )
#endif
#define BLARGG_DISABLE_NOTHROW \
void* operator new ( size_t s ) BLARGG_THROWS(()) { return malloc( s ); }\
void operator delete ( void* p ) { free( p ); }
#define BLARGG_NEW new
#else
#include <new>
#define BLARGG_NEW new (std::nothrow)
#endif
// BLARGG_4CHAR('a','b','c','d') = 'abcd' (four character integer constant)
#define BLARGG_4CHAR( a, b, c, d ) \
((a&0xFF)*0x1000000L + (b&0xFF)*0x10000L + (c&0xFF)*0x100L + (d&0xFF))
// BOOST_STATIC_ASSERT( expr ): Generates compile error if expr is 0.
#ifndef BOOST_STATIC_ASSERT
#ifdef _MSC_VER
// MSVC6 (_MSC_VER < 1300) fails for use of __LINE__ when /Zl is specified
#define BOOST_STATIC_ASSERT( expr ) \
void blargg_failed_( int (*arg) [2 / (int) !!(expr) - 1] )
#else
// Some other compilers fail when declaring same function multiple times in class,
// so differentiate them by line
#define BOOST_STATIC_ASSERT( expr ) \
void blargg_failed_( int (*arg) [2 / !!(expr) - 1] [__LINE__] )
#endif
#endif
// BLARGG_COMPILER_HAS_BOOL: If 0, provides bool support for old compiler. If 1,
// compiler is assumed to support bool. If undefined, availability is determined.
#ifndef BLARGG_COMPILER_HAS_BOOL
#if defined (__MWERKS__)
#if !__option(bool)
#define BLARGG_COMPILER_HAS_BOOL 0
#endif
#elif defined (_MSC_VER)
#if _MSC_VER < 1100
#define BLARGG_COMPILER_HAS_BOOL 0
#endif
#elif defined (__GNUC__)
// supports bool
#elif __cplusplus < 199711
#define BLARGG_COMPILER_HAS_BOOL 0
#endif
#endif
#if defined (BLARGG_COMPILER_HAS_BOOL) && !BLARGG_COMPILER_HAS_BOOL
// If you get errors here, modify your blargg_config.h file
typedef int bool;
const bool true = 1;
const bool false = 0;
#endif
// blargg_long/blargg_ulong = at least 32 bits, int if it's big enough
#if INT_MAX < 0x7FFFFFFF || LONG_MAX == 0x7FFFFFFF
typedef long blargg_long;
#else
typedef int blargg_long;
#endif
#if UINT_MAX < 0xFFFFFFFF || ULONG_MAX == 0xFFFFFFFF
typedef unsigned long blargg_ulong;
#else
typedef unsigned blargg_ulong;
#endif
// BOOST::int8_t etc.
// HAVE_STDINT_H: If defined, use <stdint.h> for int8_t etc.
#if defined (HAVE_STDINT_H)
#include <stdint.h>
#define BOOST
// HAVE_INTTYPES_H: If defined, use <stdint.h> for int8_t etc.
#elif defined (HAVE_INTTYPES_H)
#include <inttypes.h>
#define BOOST
#else
struct BOOST
{
#if UCHAR_MAX == 0xFF && SCHAR_MAX == 0x7F
typedef signed char int8_t;
typedef unsigned char uint8_t;
#else
// No suitable 8-bit type available
typedef struct see_blargg_common_h int8_t;
typedef struct see_blargg_common_h uint8_t;
#endif
#if USHRT_MAX == 0xFFFF
typedef short int16_t;
typedef unsigned short uint16_t;
#else
// No suitable 16-bit type available
typedef struct see_blargg_common_h int16_t;
typedef struct see_blargg_common_h uint16_t;
#endif
#if ULONG_MAX == 0xFFFFFFFF
typedef long int32_t;
typedef unsigned long uint32_t;
#elif UINT_MAX == 0xFFFFFFFF
typedef int int32_t;
typedef unsigned int uint32_t;
#else
// No suitable 32-bit type available
typedef struct see_blargg_common_h int32_t;
typedef struct see_blargg_common_h uint32_t;
#endif
};
#endif
#endif
#endif

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waterbox/sameboy/snes_spc/blargg_config.h
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// snes_spc 0.9.0 user configuration file. Don't replace when updating library.
// snes_spc 0.9.0
#ifndef BLARGG_CONFIG_H
#define BLARGG_CONFIG_H
// Uncomment to disable debugging checks
//#define NDEBUG 1
// Uncomment to enable platform-specific (and possibly non-portable) optimizations
//#define BLARGG_NONPORTABLE 1
// Uncomment if automatic byte-order determination doesn't work
//#define BLARGG_BIG_ENDIAN 1
// Uncomment if you get errors in the bool section of blargg_common.h
//#define BLARGG_COMPILER_HAS_BOOL 1
// Use standard config.h if present
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#endif

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waterbox/sameboy/snes_spc/blargg_endian.h
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// CPU Byte Order Utilities
// snes_spc 0.9.0
#ifndef BLARGG_ENDIAN
#define BLARGG_ENDIAN
#include "blargg_common.h"
// BLARGG_CPU_CISC: Defined if CPU has very few general-purpose registers (< 16)
#if defined (_M_IX86) || defined (_M_IA64) || defined (__i486__) || \
defined (__x86_64__) || defined (__ia64__) || defined (__i386__)
#define BLARGG_CPU_X86 1
#define BLARGG_CPU_CISC 1
#endif
#if defined (__powerpc__) || defined (__ppc__) || defined (__POWERPC__) || defined (__powerc)
#define BLARGG_CPU_POWERPC 1
#define BLARGG_CPU_RISC 1
#endif
// BLARGG_BIG_ENDIAN, BLARGG_LITTLE_ENDIAN: Determined automatically, otherwise only
// one may be #defined to 1. Only needed if something actually depends on byte order.
#if !defined (BLARGG_BIG_ENDIAN) && !defined (BLARGG_LITTLE_ENDIAN)
#ifdef __GLIBC__
// GCC handles this for us
#include <endian.h>
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define BLARGG_LITTLE_ENDIAN 1
#elif __BYTE_ORDER == __BIG_ENDIAN
#define BLARGG_BIG_ENDIAN 1
#endif
#else
#if defined (LSB_FIRST) || defined (__LITTLE_ENDIAN__) || BLARGG_CPU_X86 || \
(defined (LITTLE_ENDIAN) && LITTLE_ENDIAN+0 != 1234)
#define BLARGG_LITTLE_ENDIAN 1
#endif
#if defined (MSB_FIRST) || defined (__BIG_ENDIAN__) || defined (WORDS_BIGENDIAN) || \
defined (__sparc__) || BLARGG_CPU_POWERPC || \
(defined (BIG_ENDIAN) && BIG_ENDIAN+0 != 4321)
#define BLARGG_BIG_ENDIAN 1
#elif !defined (__mips__)
// No endian specified; assume little-endian, since it's most common
#define BLARGG_LITTLE_ENDIAN 1
#endif
#endif
#endif
#if BLARGG_LITTLE_ENDIAN && BLARGG_BIG_ENDIAN
#undef BLARGG_LITTLE_ENDIAN
#undef BLARGG_BIG_ENDIAN
#endif
inline void blargg_verify_byte_order()
{
#ifndef NDEBUG
#if BLARGG_BIG_ENDIAN
volatile int i = 1;
assert( *(volatile char*) &i == 0 );
#elif BLARGG_LITTLE_ENDIAN
volatile int i = 1;
assert( *(volatile char*) &i != 0 );
#endif
#endif
}
inline unsigned get_le16( void const* p )
{
return (unsigned) ((unsigned char const*) p) [1] << 8 |
(unsigned) ((unsigned char const*) p) [0];
}
inline unsigned get_be16( void const* p )
{
return (unsigned) ((unsigned char const*) p) [0] << 8 |
(unsigned) ((unsigned char const*) p) [1];
}
inline blargg_ulong get_le32( void const* p )
{
return (blargg_ulong) ((unsigned char const*) p) [3] << 24 |
(blargg_ulong) ((unsigned char const*) p) [2] << 16 |
(blargg_ulong) ((unsigned char const*) p) [1] << 8 |
(blargg_ulong) ((unsigned char const*) p) [0];
}
inline blargg_ulong get_be32( void const* p )
{
return (blargg_ulong) ((unsigned char const*) p) [0] << 24 |
(blargg_ulong) ((unsigned char const*) p) [1] << 16 |
(blargg_ulong) ((unsigned char const*) p) [2] << 8 |
(blargg_ulong) ((unsigned char const*) p) [3];
}
inline void set_le16( void* p, unsigned n )
{
((unsigned char*) p) [1] = (unsigned char) (n >> 8);
((unsigned char*) p) [0] = (unsigned char) n;
}
inline void set_be16( void* p, unsigned n )
{
((unsigned char*) p) [0] = (unsigned char) (n >> 8);
((unsigned char*) p) [1] = (unsigned char) n;
}
inline void set_le32( void* p, blargg_ulong n )
{
((unsigned char*) p) [0] = (unsigned char) n;
((unsigned char*) p) [1] = (unsigned char) (n >> 8);
((unsigned char*) p) [2] = (unsigned char) (n >> 16);
((unsigned char*) p) [3] = (unsigned char) (n >> 24);
}
inline void set_be32( void* p, blargg_ulong n )
{
((unsigned char*) p) [3] = (unsigned char) n;
((unsigned char*) p) [2] = (unsigned char) (n >> 8);
((unsigned char*) p) [1] = (unsigned char) (n >> 16);
((unsigned char*) p) [0] = (unsigned char) (n >> 24);
}
#if BLARGG_NONPORTABLE
// Optimized implementation if byte order is known
#if BLARGG_LITTLE_ENDIAN
#define GET_LE16( addr ) (*(BOOST::uint16_t*) (addr))
#define GET_LE32( addr ) (*(BOOST::uint32_t*) (addr))
#define SET_LE16( addr, data ) (void) (*(BOOST::uint16_t*) (addr) = (data))
#define SET_LE32( addr, data ) (void) (*(BOOST::uint32_t*) (addr) = (data))
#elif BLARGG_BIG_ENDIAN
#define GET_BE16( addr ) (*(BOOST::uint16_t*) (addr))
#define GET_BE32( addr ) (*(BOOST::uint32_t*) (addr))
#define SET_BE16( addr, data ) (void) (*(BOOST::uint16_t*) (addr) = (data))
#define SET_BE32( addr, data ) (void) (*(BOOST::uint32_t*) (addr) = (data))
#if BLARGG_CPU_POWERPC
// PowerPC has special byte-reversed instructions
#if defined (__MWERKS__)
#define GET_LE16( addr ) (__lhbrx( addr, 0 ))
#define GET_LE32( addr ) (__lwbrx( addr, 0 ))
#define SET_LE16( addr, in ) (__sthbrx( in, addr, 0 ))
#define SET_LE32( addr, in ) (__stwbrx( in, addr, 0 ))
#elif defined (__GNUC__)
#define GET_LE16( addr ) ({unsigned ppc_lhbrx_; asm( "lhbrx %0,0,%1" : "=r" (ppc_lhbrx_) : "r" (addr), "0" (ppc_lhbrx_) ); ppc_lhbrx_;})
#define GET_LE32( addr ) ({unsigned ppc_lwbrx_; asm( "lwbrx %0,0,%1" : "=r" (ppc_lwbrx_) : "r" (addr), "0" (ppc_lwbrx_) ); ppc_lwbrx_;})
#define SET_LE16( addr, in ) ({asm( "sthbrx %0,0,%1" : : "r" (in), "r" (addr) );})
#define SET_LE32( addr, in ) ({asm( "stwbrx %0,0,%1" : : "r" (in), "r" (addr) );})
#endif
#endif
#endif
#endif
#ifndef GET_LE16
#define GET_LE16( addr ) get_le16( addr )
#define SET_LE16( addr, data ) set_le16( addr, data )
#endif
#ifndef GET_LE32
#define GET_LE32( addr ) get_le32( addr )
#define SET_LE32( addr, data ) set_le32( addr, data )
#endif
#ifndef GET_BE16
#define GET_BE16( addr ) get_be16( addr )
#define SET_BE16( addr, data ) set_be16( addr, data )
#endif
#ifndef GET_BE32
#define GET_BE32( addr ) get_be32( addr )
#define SET_BE32( addr, data ) set_be32( addr, data )
#endif
// auto-selecting versions
inline void set_le( BOOST::uint16_t* p, unsigned n ) { SET_LE16( p, n ); }
inline void set_le( BOOST::uint32_t* p, blargg_ulong n ) { SET_LE32( p, n ); }
inline void set_be( BOOST::uint16_t* p, unsigned n ) { SET_BE16( p, n ); }
inline void set_be( BOOST::uint32_t* p, blargg_ulong n ) { SET_BE32( p, n ); }
inline unsigned get_le( BOOST::uint16_t* p ) { return GET_LE16( p ); }
inline blargg_ulong get_le( BOOST::uint32_t* p ) { return GET_LE32( p ); }
inline unsigned get_be( BOOST::uint16_t* p ) { return GET_BE16( p ); }
inline blargg_ulong get_be( BOOST::uint32_t* p ) { return GET_BE32( p ); }
#endif

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/* Included at the beginning of library source files, after all other #include lines.
Sets up helpful macros and services used in my source code. They don't need
module an annoying module prefix on their names since they are defined after
all other #include lines. */
// snes_spc 0.9.0
#ifndef BLARGG_SOURCE_H
#define BLARGG_SOURCE_H
// If debugging is enabled, abort program if expr is false. Meant for checking
// internal state and consistency. A failed assertion indicates a bug in the module.
// void assert( bool expr );
#include <assert.h>
// If debugging is enabled and expr is false, abort program. Meant for checking
// caller-supplied parameters and operations that are outside the control of the
// module. A failed requirement indicates a bug outside the module.
// void require( bool expr );
#undef require
#define require( expr ) assert( expr )
// Like printf() except output goes to debug log file. Might be defined to do
// nothing (not even evaluate its arguments).
// void dprintf( const char* format, ... );
static inline void blargg_dprintf_( const char*, ... ) { }
#undef dprintf
#define dprintf (1) ? (void) 0 : blargg_dprintf_
// If enabled, evaluate expr and if false, make debug log entry with source file
// and line. Meant for finding situations that should be examined further, but that
// don't indicate a problem. In all cases, execution continues normally.
#undef check
#define check( expr ) ((void) 0)
// If expr yields error string, return it from current function, otherwise continue.
#undef RETURN_ERR
#define RETURN_ERR( expr ) do { \
blargg_err_t blargg_return_err_ = (expr); \
if ( blargg_return_err_ ) return blargg_return_err_; \
} while ( 0 )
// If ptr is 0, return out of memory error string.
#undef CHECK_ALLOC
#define CHECK_ALLOC( ptr ) do { if ( (ptr) == 0 ) return "Out of memory"; } while ( 0 )
// Avoid any macros which evaluate their arguments multiple times
#undef min
#undef max
#define DEF_MIN_MAX( type ) \
static inline type min( type x, type y ) { if ( x < y ) return x; return y; }\
static inline type max( type x, type y ) { if ( y < x ) return x; return y; }
DEF_MIN_MAX( int )
DEF_MIN_MAX( unsigned )
DEF_MIN_MAX( long )
DEF_MIN_MAX( unsigned long )
DEF_MIN_MAX( float )
DEF_MIN_MAX( double )
#undef DEF_MIN_MAX
/*
// using const references generates crappy code, and I am currenly only using these
// for built-in types, so they take arguments by value
// TODO: remove
inline int min( int x, int y )
template<class T>
inline T min( T x, T y )
{
if ( x < y )
return x;
return y;
}
template<class T>
inline T max( T x, T y )
{
if ( x < y )
return y;
return x;
}
*/
// TODO: good idea? bad idea?
#undef byte
#define byte byte_
typedef unsigned char byte;
// deprecated
#define BLARGG_CHECK_ALLOC CHECK_ALLOC
#define BLARGG_RETURN_ERR RETURN_ERR
// BLARGG_SOURCE_BEGIN: If defined, #included, allowing redefition of dprintf and check
#ifdef BLARGG_SOURCE_BEGIN
#include BLARGG_SOURCE_BEGIN
#endif
#endif

107
waterbox/sameboy/snes_spc/changes.txt
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snes_spc Change Log
-------------------
snes_spc 0.9.0
--------------
- Improved documentation
- SPC: Added spc_skip() function for quickly seeking in an SPC music
file. Runs 3-4x faster than normal playback using the fast DSP (or about
43-60X real-time on my 400 MHz Mac).
- SPC: Added spc_set_tempo() to change tempo of SPC music playback.
- SPC: Sample generation is now corrected to generate exactly one pair
of samples every 32 clocks without exception. Before it could generate a
few samples more or less depending on how far ahead or behind DSP was at
the moment.
- SPC: Changed spc_reset() and spc_soft_reset() to also reset output
buffer (see spc.h).
- SPC: Fixed minor timer counting bug.
- SPC: Stack pointer wrap-around is now emulated (and without any
noticeable performance hit).
- SPC: Runs about 5% faster due to various optimizations.
- SPC: Found way to make fast DSP register accesses cycle-accurate in
most cases, without reducing performance. Allows fast DSP to pass most
of my validation tests.
- DSP: Added surround disable support to fast DSP again.
- DSP: Improved voice un-muting to take effect immediately on fast DSP.
- DSP: Noise shift register now starts at 0x4000 instead of 0x4001 as it
incorrectly did before.
- Converted library to C++ code internally. A C interface is still
included in spc.h and dsp.h. Note that these are different than the
previous interface, so your code will require minor changes:
Old SPC code New SPC code
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#include "spc/spc.h" #include "snes_spc/spc.h"
snes_spc_t* spc; SNES_SPC* spc;
spc = malloc( sizeof (snes_spc_t) ); spc = spc_new();
spc_init( spc );
spc_end_frame( time ); spc_end_frame( spc, time );
/* etc. */
/* done using SPC */ spc_delete( spc );
Old DSP code New DSP code
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#include "spc/spc_dsp.h" #include "snes_spc/dsp.h"
spc_dsp_init( ram ); SPC_DSP* dsp;
dsp = spc_dsp_new();
spc_dsp_init( dsp, ram );
spc_dsp_run( count ); spc_dsp_run( dsp, count );
/* etc. */
/* done using DSP */ spc_dsp_delete( dsp );
snes_spc 0.8.0
--------------
- Added several demos
- Added high-pass/low-pass filter to better match SNES sound
- Added save state functionality for SPC and accurate DSP (but not fast
DSP)
- Added emulation of reset switch on NES (soft reset)
- Made source more compatible with pre-C99 compilers by eliminating
mid-block declarations
- SPC: Many S-SMP accuracy improvements, mostly in memory access times
- SPC: S-SMP speed improvements
- SPC: Added SPC load/save functions and KON checking to help trim
silence from beginning
- SPC: Changed spc_init() to have you allocate most of the memory used
by the library so you have more control over it
- DSP: New highly accurate DSP and faster version derived from same code
- DSP: Changed prefix from dsp_ to spc_dsp_. Your DSP code will require
changes.
- DSP: Removed surround disable and gain. Gain can now be done with the
dsp_filter module, and surround disable will probably only be
implemented in the fast DSP at some point.
- DSP: Changed interface to work in clocks rather than samples,
necessary for the new accurate DSP. Sample output is now done with
separate functions. Your DSP code will require changes.

48
waterbox/sameboy/snes_spc/dsp.cpp
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// snes_spc 0.9.0. http://www.slack.net/~ant/
#include "dsp.h"
#include "SPC_DSP.h"
/* Copyright (C) 2007 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details. You should have received a copy of the GNU Lesser General Public
License along with this module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
#include "blargg_source.h"
SPC_DSP* spc_dsp_new( void )
{
// be sure constants match
assert( spc_dsp_voice_count == (int) SPC_DSP::voice_count );
assert( spc_dsp_register_count == (int) SPC_DSP::register_count );
#if !SPC_NO_COPY_STATE_FUNCS
assert( spc_dsp_state_size == (int) SPC_DSP::state_size );
#endif
return new SPC_DSP;
}
void spc_dsp_delete ( SPC_DSP* s ) { delete s; }
void spc_dsp_init ( SPC_DSP* s, void* ram_64k ) { s->init( ram_64k ); }
void spc_dsp_set_output ( SPC_DSP* s, spc_dsp_sample_t* p, int n ) { s->set_output( p, n ); }
int spc_dsp_sample_count( SPC_DSP const* s ) { return s->sample_count(); }
void spc_dsp_reset ( SPC_DSP* s ) { s->reset(); }
void spc_dsp_soft_reset ( SPC_DSP* s ) { s->soft_reset(); }
int spc_dsp_read ( SPC_DSP const* s, int addr ) { return s->read( addr ); }
void spc_dsp_write ( SPC_DSP* s, int addr, int data ) { s->write( addr, data ); }
void spc_dsp_run ( SPC_DSP* s, int clock_count ) { s->run( clock_count ); }
void spc_dsp_mute_voices ( SPC_DSP* s, int mask ) { s->mute_voices( mask ); }
void spc_dsp_disable_surround( SPC_DSP* s, int disable ) { s->disable_surround( disable ); }
void spc_dsp_load ( SPC_DSP* s, unsigned char const regs [spc_dsp_register_count] ) { s->load( regs ); }
#if !SPC_NO_COPY_STATE_FUNCS
void spc_dsp_copy_state ( SPC_DSP* s, unsigned char** p, spc_dsp_copy_func_t f ) { s->copy_state( p, f ); }
int spc_dsp_check_kon ( SPC_DSP* s ) { return s->check_kon(); }
#endif

83
waterbox/sameboy/snes_spc/dsp.h
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/* SNES SPC-700 DSP emulator C interface (also usable from C++) */
/* snes_spc 0.9.0 */
#ifndef DSP_H
#define DSP_H
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct SPC_DSP SPC_DSP;
/* Creates new DSP emulator. NULL if out of memory. */
SPC_DSP* spc_dsp_new( void );
/* Frees DSP emulator */
void spc_dsp_delete( SPC_DSP* );
/* Initializes DSP and has it use the 64K RAM provided */
void spc_dsp_init( SPC_DSP*, void* ram_64k );
/* Sets destination for output samples. If out is NULL or out_size is 0,
doesn't generate any. */
typedef short spc_dsp_sample_t;
void spc_dsp_set_output( SPC_DSP*, spc_dsp_sample_t* out, int out_size );
/* Number of samples written to output since it was last set, always
a multiple of 2. Undefined if more samples were generated than
output buffer could hold. */
int spc_dsp_sample_count( SPC_DSP const* );
/**** Emulation *****/
/* Resets DSP to power-on state */
void spc_dsp_reset( SPC_DSP* );
/* Emulates pressing reset switch on SNES */
void spc_dsp_soft_reset( SPC_DSP* );
/* Reads/writes DSP registers. For accuracy, you must first call spc_dsp_run() */
/* to catch the DSP up to present. */
int spc_dsp_read ( SPC_DSP const*, int addr );
void spc_dsp_write( SPC_DSP*, int addr, int data );
/* Runs DSP for specified number of clocks (~1024000 per second). Every 32 clocks */
/* a pair of samples is be generated. */
void spc_dsp_run( SPC_DSP*, int clock_count );
/**** Sound control *****/
/* Mutes voices corresponding to non-zero bits in mask. Reduces emulation accuracy. */
enum { spc_dsp_voice_count = 8 };
void spc_dsp_mute_voices( SPC_DSP*, int mask );
/* If true, prevents channels and global volumes from being phase-negated.
Only supported by fast DSP; has no effect on accurate DSP. */
void spc_dsp_disable_surround( SPC_DSP*, int disable );
/**** State save/load *****/
/* Resets DSP and uses supplied values to initialize registers */
enum { spc_dsp_register_count = 128 };
void spc_dsp_load( SPC_DSP*, unsigned char const regs [spc_dsp_register_count] );
/* Saves/loads exact emulator state (accurate DSP only) */
enum { spc_dsp_state_size = 640 }; /* maximum space needed when saving */
typedef void (*spc_dsp_copy_func_t)( unsigned char** io, void* state, size_t );
void spc_dsp_copy_state( SPC_DSP*, unsigned char** io, spc_dsp_copy_func_t );
/* Returns non-zero if new key-on events occurred since last call (accurate DSP only) */
int spc_dsp_check_kon( SPC_DSP* );
#ifdef __cplusplus
}
#endif
#endif

504
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GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
Copyright (C) 1991, 1999 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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To apply these terms, attach the following notices to the library. It is
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<one line to give the library's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
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This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Also add information on how to contact you by electronic and paper mail.
You should also get your employer (if you work as a programmer) or your
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library `Frob' (a library for tweaking knobs) written by James Random Hacker.
<signature of Ty Coon>, 1 April 1990
Ty Coon, President of Vice
That's all there is to it!

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snes_spc 0.9.0: SNES SPC-700 APU Emulator
-----------------------------------------
This library includes a full SPC emulator and an S-DSP emulator that can
be used on its own. Two S-DSP emulators are available: a highly accurate
one for use in a SNES emulator, and a 3x faster one for use in an SPC
music player or a resource-limited SNES emulator.
* Can be used from C and C++ code
* Full SPC-700 APU emulator with cycle accuracy in most cases
* Loads, plays, and saves SPC music files
* Can save and load exact full emulator state
* DSP voice muting, surround sound disable, and song tempo adjustment
* Uses 7% CPU average on 400 MHz Mac to play an SPC using fast DSP
The accurate DSP emulator is based on past research by others and
hundreds of hours of recent research by me. It passes over a hundred
strenuous timing and behavior validation tests that were also run on the
SNES. As far as I know, it's the first DSP emulator with cycle accuracy,
properly emulating every DSP register and memory access at the exact SPC
cycle it occurs at, whereas previous DSP emulators emulated these only
to the nearest sample (which occurs every 32 clocks).
Author : Shay Green <gblargg@gmail.com>
Website: http://www.slack.net/~ant/
Forum : http://groups.google.com/group/blargg-sound-libs
License: GNU Lesser General Public License (LGPL)
Getting Started
---------------
Build a program consisting of demo/play_spc.c, demo/demo_util.c,
demo/wave_writer.c, and all source files in snes_spc/. Put an SPC music
file in the same directory and name it "test.spc". Running the program
should generate the recording "out.wav".
Read snes_spc.txt for more information. Post to the discussion forum for
assistance.
Files
-----
snes_spc.txt Documentation
changes.txt Change log
license.txt GNU LGPL license
demo/
play_spc.c Records SPC file to wave sound file
benchmark.c Finds how fast emulator runs on your computer
trim_spc.c Trims silence off beginning of an SPC file
save_state.c Saves/loads exact emulator state to/from file
comm.c Communicates with SPC how SNES would
demo_util.h General utility functions used by demos
demo_util.c
wave_writer.h WAVE sound file writer used for demo output
wave_writer.c
fast_dsp/ Optional standalone fast DSP emulator
SPC_DSP.h To use with full SPC emulator, move into
SPC_DSP.cpp snes_spc/ and replace original files
snes_spc/ Library sources
blargg_config.h Configuration (modify as necessary)
spc.h C interface to SPC emulator and sound filter
spc.cpp
SPC_Filter.h Optional filter to make sound more authentic
SPC_Filter.cpp
SNES_SPC.h Full SPC emulator
SNES_SPC.cpp
SNES_SPC_misc.cpp
SNES_SPC_state.cpp
SPC_CPU.h
dsp.h C interface to DSP emulator
dsp.cpp
SPC_DSP.h Standalone accurate DSP emulator
SPC_DSP.cpp
blargg_common.h
blargg_endian.h
blargg_source.h
--
Shay Green <gblargg@gmail.com>

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snes_spc 0.9.0: SNES SPC-700 APU Emulator
-----------------------------------------
Author : Shay Green <gblargg@gmail.com>
Website: http://www.slack.net/~ant/
Forum : http://groups.google.com/group/blargg-sound-libs
License: GNU Lesser General Public License (LGPL)
Contents
--------
* C and C++ Interfaces
* Overview
* Full SPC Emulation
* DSP Emulation
* SPC Music Playback
* State Copying
* Library Compilation
* Error handling
* Solving Problems
* Accurate S-DSP Limitations
* Fast S-DSP Limitations
* S-SMP Limitations
* To Do
* Thanks
C and C++ Interfaces
--------------------
The library includes a C interface in spc.h and dsp.h, which can be used
from C and C++. This C interface is referred to in the following
documentation. If you're building this as a shared library (rather than
linking statically), you should use the C interface since it will change
less in future versions.
The native C++ interface is in the header files SNES_SPC.h, SPC_DSP.h,
and SPC_Filter.h, and the two interfaces can be freely mixed in C++
code. Conversion between the two interfaces generally follows a pattern:
C interface C++ interface
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
SNES_SPC* spc; SNES_SPC* spc;
spc = spc_new(); spc = new SNES_SPC;
spc_play( spc, count, buf ); spc->play( count, buf );
spc_sample_rate SNES_SPC::sample_rate
spc_delete( spc ); delete spc;
Overview
--------
There are three main roles for this library:
* Full SPC emulation in a SNES emulator
* DSP emulation in a SNES emulator (where you emulate the SMP CPU)
* SPC playback in an SPC music file player
Each of these uses are described separately below.
Full SPC Emulation
------------------
See spc.h for full function reference (SNES_SPC.h if using C++).
* Create SPC emulator with spc_new() and check for NULL.
* Call spc_init_rom() with a pointer to the 64-byte IPL ROM dump (not
included with library).
* When your emulated SNES is powered on, call spc_reset(). When the
reset switch is pressed, call spc_soft_reset().
* Call spc_set_output() with your output buffer, then do emulation.
* When the SNES CPU accesses APU ports, call spc_read_port() and
spc_write_port().
* When your emulator's timebase is going back to 0, call
spc_end_frame(), usually at the end of a video frame or scanline.
* Periodically play samples from your buffer. Use spc_sample_count() to
find out how many samples have been written, then spc_set_output() after
you've made more space in your buffer.
* Save/load full emulator state with spc_copy_state().
* You can save as an SPC music file with spc_save_spc().
* When done, use spc_delete() to free memory.
DSP Emulation
-------------
See dsp.h for full function reference (SPC_DSP.h if using C++).
* Create DSP emulator with spc_dsp_new() and check for NULL.
* Let the DSP know where your 64K RAM is with spc_dsp_init().
* When your emulated SNES is powered on, call spc_dsp_reset(). When the
reset switch is pressed, call spc_dsp_soft_reset().
* Call spc_dsp_set_output() with your output buffer, then do emulation.
* Use spc_dsp_run() to run DSP for specified number of clocks (1024000
per second). Every 32 clocks a pair of samples is added to your output
buffer.
* Use spc_dsp_read() and spc_dsp_write() to handle DSP reads/writes from
the S-SMP. Before calling these always catch the DSP up to present time
with spc_dsp_run().
* Periodically play samples from your buffer. Use spc_dsp_sample_count()
to find out how many samples have been written, then
spc_dsp_set_output() after you've made more space in your buffer.
* Use spc_dsp_copy_state() to save/load full DSP state.
* When done, use spc_delete() to free memory.
SPC Music Playback
------------------
See spc.h for full function reference (SNES_SPC.h if using C++).
* Create SPC emulator with spc_new() and check for NULL.
* Load SPC with spc_load_spc() and check for error.
* Optionally cear echo buffer with spc_clear_echo(). Many SPCs have
garbage in echo buffer, which causes noise at the beginning.
* Generate samples as needed with spc_play().
* When done, use spc_delete() to free memory.
* For a more complete game music playback library, use Game_Music_Emu
State Copying
-------------
The SPC and DSP modules include state save/load functions. They take a
pointer to a pointer to a buffer to store state, and a copy function.
This copy function can either copy data to the buffer or from it,
allowing state save and restore with the same library function. The
internal save state format allows for future expansion without making
previous save states unusable.
The SPC save state format puts the most important parts first to make it
easier to manually examine. It's organized as follows:
Offset Size Data
- - - - - - - - - - - - - - - - - -
0 $10000 SPC RAM
$10000 $10 SMP $F0-$FF registers
$10010 4 SMP $F4-$F8 output registers
$10014 2 PC
$10016 1 A
$10017 1 X
$10018 1 Y
$10019 1 PSW
$1001A 1 SP
$1001B 5 internal
$10020 $80 DSP registers
$100A0 ... internal
Library Compilation
-------------------
While this library is in C++, it has been written to easily link in a C
program *without* needing the standard C++ library. It doesn't use
exception handling or run-time type information (RTTI), so you can
disable these in your C++ compiler to increase efficiency.
If you're building a shared library (DLL), I recommend only exporting
the C interfaces in spc.h and dsp.h, as the C++ interfaces expose
implementation details that will break link compatibility across
versions.
If you're using C and compiling with GCC, I recommend the following
command-line options when compiling the library source, otherwise GCC
will insert calls to the standard C++ library and require that it be
linked in:
-fno-rtti -fno-exceptions
For maximum optimization, see the NDEBUG and BLARGG_NONPORTABLE options
in blargg_config. If using GCC, you can enable these by adding the
following command-line options when you invoke gcc. If you encounter
problems, try without -DBLARGG_NONPORTABLE; if that works, contact me so
I can figure out why BLARGG_NONPORTABLE was causing it to fail.
-O3 -DNDEBUG -DBLARGG_NONPORTABLE -fno-rtti -fno-exceptions
Error handling
--------------
Functions which can fail have a return type of spc_err_t (blargg_err_t
in the C++ interfaces), which is a pointer to an error string (const
char*). If a function is successful it returns NULL. Errors that you can
easily avoid are checked with debug assertions; spc_err_t return values
are only used for genuine run-time errors that can't be easily predicted
in advance (out of memory, I/O errors, incompatible file data). Your
code should check all error values.
To improve usability for C programmers, C++ programmers unfamiliar with
exceptions, and compatibility with older C++ compilers, the library does
*not* throw any C++ exceptions and uses malloc() instead of the standard
operator new. This means that you *must* check for NULL when creating a
library object with the new operator.
Solving Problems
----------------
If you're having problems, try the following:
* If you're getting garbled sound, try this simple siren generator in
place of your call to play(). This will quickly tell whether the problem
is in the library or in your code.
static void play_siren( long count, short* out )
{
static double a, a2;
while ( count-- )
*out++ = 0x2000 * sin( a += .1 + .05*sin( a2+=.00005 ) );
}
* Enable debugging support in your environment. This enables assertions
and other run-time checks.
* Turn the compiler's optimizer is off. Sometimes an optimizer generates
bad code.
* If multiple threads are being used, ensure that only one at a time is
accessing a given set of objects from the library. This library is not
in general thread-safe, though independent objects can be used in
separate threads.
* If all else fails, see if the demos work.
Accurate S-DSP Limitations
--------------------------
* Power-up and soft reset behavior might have slight inaccuracies.
* Muting (FLG bit 6) behavior when toggling bit very rapidly is not
emulated properly.
* No other known inaccuracies. Has passed 100+ strenuous tests.
Fast S-DSP Limitations
----------------------
* Uses faster sample calculations except in cases where exact value is
actually important (BRR decoding, and gaussian interpolation combined
with pitch modulation).
* Stops decoding BRR data when a voice's envelope has released to
silence.
* Emulates 32 clocks at a time, so DSP register and memory accesses are
all done in a bunch rather than spread out. Even though, some clever
code makes register accesses separated by 40 or so clocks occur with
cycle-accurate timing.
S-SMP Limitations
-----------------
* Opcode fetches and indirect pointers are always read directly from
memory, even for the $F0-$FF region, and the DSP is not caught up for
these fetches.
* Attempts to perversely execute data in registers or an area being
modified by echo will not be emulated properly.
* Has not been thoroughly tested.
* Test register ($F0) is not implemented.
* Echo buffer can overwrite IPL ROM area, and does not correctly update
extra RAM there.
To Do
-----
* I'd like feedback on the interface and any ways to improve it. In
particular, the differing features between the accurate and fast DSP
emulators might make it harder to cleanly switch between them without
modifying source code.
* Finish thorough tests on SMP memory access times.
* Finish thorough tests on SMP instruction behavior (flags, registers).
* Finish thorough tests on SMP timers.
* Finish power-up and reset behavior testing.
* Come up with best starting conditions to play an SPC and implement in
hardware SNES SPC player for verification.
Thanks
------
Thanks to Anti-Resonance's SPC2ROM and help getting SPCs playing on my
SNES in the first place, then Brad Martin's openspc and Chris Moeller's
openspc++ C++ adaptation, giving me a good SPC emulator to start with
several years ago. Thanks to Richard Bannister, Mahendra Tallur, Shazz,
nenolod, theHobbit, Johan Samuelsson, nes6502, and Micket for helping
test my Game_Music_Emu library. Thanks to hcs for help in converting to
C for the Rockbox port. Thanks to byuu (bsnes author) and pagefault and
Nach (zsnes team) for testing and using my new rewritten DSP in their
emulators. Thanks to anomie for his good SNES documentation and
discussions with me to keep it up to date with my latest findings.
--
Shay Green <gblargg@gmail.com>

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// snes_spc 0.9.0. http://www.slack.net/~ant/
#include "spc.h"
#include "SNES_SPC.h"
#include "SPC_Filter.h"
/* Copyright (C) 2004-2007 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details. You should have received a copy of the GNU Lesser General Public
License along with this module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
#include "blargg_source.h"
SNES_SPC* spc_new( void )
{
// be sure constants match
assert( spc_sample_rate == (int) SNES_SPC::sample_rate );
assert( spc_rom_size == (int) SNES_SPC::rom_size );
assert( spc_clock_rate == (int) SNES_SPC::clock_rate );
assert( spc_clocks_per_sample == (int) SNES_SPC::clocks_per_sample );
assert( spc_port_count == (int) SNES_SPC::port_count );
assert( spc_voice_count == (int) SNES_SPC::voice_count );
assert( spc_tempo_unit == (int) SNES_SPC::tempo_unit );
assert( spc_file_size == (int) SNES_SPC::spc_file_size );
#if !SPC_NO_COPY_STATE_FUNCS
assert( spc_state_size == (int) SNES_SPC::state_size );
#endif
SNES_SPC* s = new SNES_SPC;
if ( s && s->init() )
{
delete s;
s = 0;
}
return s;
}
void spc_delete ( SNES_SPC* s ) { delete s; }
void spc_init_rom ( SNES_SPC* s, unsigned char const r [64] ) { s->init_rom( r ); }
void spc_set_output ( SNES_SPC* s, spc_sample_t* p, int n ) { s->set_output( p, n ); }
int spc_sample_count ( SNES_SPC const* s ) { return s->sample_count(); }
void spc_reset ( SNES_SPC* s ) { s->reset(); }
void spc_soft_reset ( SNES_SPC* s ) { s->soft_reset(); }
int spc_read_port ( SNES_SPC* s, spc_time_t t, int p ) { return s->read_port( t, p ); }
void spc_write_port ( SNES_SPC* s, spc_time_t t, int p, int d ) { s->write_port( t, p, d ); }
void spc_end_frame ( SNES_SPC* s, spc_time_t t ) { s->end_frame( t ); }
void spc_mute_voices ( SNES_SPC* s, int mask ) { s->mute_voices( mask ); }
void spc_disable_surround( SNES_SPC* s, int disable ) { s->disable_surround( disable ); }
void spc_set_tempo ( SNES_SPC* s, int tempo ) { s->set_tempo( tempo ); }
uint8_t* spc_get_ram(SNES_SPC* s) { return s->get_ram(); }
spc_err_t spc_load_spc ( SNES_SPC* s, void const* p, long n ) { return s->load_spc( p, n ); }
void spc_clear_echo ( SNES_SPC* s ) { s->clear_echo(); }
spc_err_t spc_play ( SNES_SPC* s, int count, short* out ) { return s->play( count, out ); }
spc_err_t spc_skip ( SNES_SPC* s, int count ) { return s->skip( count ); }
#if !SPC_NO_COPY_STATE_FUNCS
void spc_copy_state ( SNES_SPC* s, unsigned char** p, spc_copy_func_t f ) { s->copy_state( p, f ); }
void spc_init_header ( void* spc_out ) { SNES_SPC::init_header( spc_out ); }
void spc_save_spc ( SNES_SPC* s, void* spc_out ) { s->save_spc( spc_out ); }
int spc_check_kon ( SNES_SPC* s ) { return s->check_kon(); }
#endif
SPC_Filter* spc_filter_new( void ) { return new SPC_Filter; }
void spc_filter_delete( SPC_Filter* f ) { delete f; }
void spc_filter_run( SPC_Filter* f, spc_sample_t* p, int s ) { f->run( p, s ); }
void spc_filter_clear( SPC_Filter* f ) { f->clear(); }
void spc_filter_set_gain( SPC_Filter* f, int gain ) { f->set_gain( gain ); }
void spc_filter_set_bass( SPC_Filter* f, int bass ) { f->set_bass( bass ); }

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/* SNES SPC-700 APU emulator C interface (also usable from C++) */
/* snes_spc 0.9.0 */
#ifndef SPC_H
#define SPC_H
#include <stddef.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Error string return. NULL if success, otherwise error message. */
typedef const char* spc_err_t;
typedef struct SNES_SPC SNES_SPC;
/* Creates new SPC emulator. NULL if out of memory. */
SNES_SPC* spc_new( void );
/* Frees SPC emulator */
void spc_delete( SNES_SPC* );
/* Sample pairs generated per second */
enum { spc_sample_rate = 32000 };
/**** Emulator use ****/
/* Sets IPL ROM data. Library does not include ROM data. Most SPC music files
don't need ROM, but a full emulator must provide this. */
enum { spc_rom_size = 0x40 };
void spc_init_rom( SNES_SPC*, unsigned char const rom [spc_rom_size] );
/* Sets destination for output samples */
typedef short spc_sample_t;
void spc_set_output( SNES_SPC*, spc_sample_t* out, int out_size );
/* Number of samples written to output since last set */
int spc_sample_count( SNES_SPC const* );
/* Resets SPC to power-on state. This resets your output buffer, so you must
call spc_set_output() after this. */
void spc_reset( SNES_SPC* );
/* Emulates pressing reset switch on SNES. This resets your output buffer, so
you must call spc_set_output() after this. */
void spc_soft_reset( SNES_SPC* );
/* 1024000 SPC clocks per second, sample pair every 32 clocks */
typedef int spc_time_t;
enum { spc_clock_rate = 1024000 };
enum { spc_clocks_per_sample = 32 };
/* Reads/writes port at specified time */
enum { spc_port_count = 4 };
int spc_read_port ( SNES_SPC*, spc_time_t, int port );
void spc_write_port( SNES_SPC*, spc_time_t, int port, int data );
/* Runs SPC to end_time and starts a new time frame at 0 */
void spc_end_frame( SNES_SPC*, spc_time_t end_time );
uint8_t* spc_get_ram(SNES_SPC*);
/**** Sound control ****/
/*Mutes voices corresponding to non-zero bits in mask. Reduces emulation accuracy. */
enum { spc_voice_count = 8 };
void spc_mute_voices( SNES_SPC*, int mask );
/* If true, prevents channels and global volumes from being phase-negated.
Only supported by fast DSP; has no effect on accurate DSP. */
void spc_disable_surround( SNES_SPC*, int disable );
/* Sets tempo, where spc_tempo_unit = normal, spc_tempo_unit / 2 = half speed, etc. */
enum { spc_tempo_unit = 0x100 };
void spc_set_tempo( SNES_SPC*, int );
/**** SPC music playback *****/
/* Loads SPC data into emulator. Returns NULL on success, otherwise error string. */
spc_err_t spc_load_spc( SNES_SPC*, void const* spc_in, long size );
/* Clears echo region. Useful after loading an SPC as many have garbage in echo. */
void spc_clear_echo( SNES_SPC* );
/* Plays for count samples and write samples to out. Discards samples if out
is NULL. Count must be a multiple of 2 since output is stereo. */
spc_err_t spc_play( SNES_SPC*, int count, short* out );
/* Skips count samples. Several times faster than spc_play(). */
spc_err_t spc_skip( SNES_SPC*, int count );
/**** State save/load (only available with accurate DSP) ****/
/* Saves/loads exact emulator state */
enum { spc_state_size = 67 * 1024L }; /* maximum space needed when saving */
typedef void (*spc_copy_func_t)( unsigned char** io, void* state, size_t );
void spc_copy_state( SNES_SPC*, unsigned char** io, spc_copy_func_t );
/* Writes minimal SPC file header to spc_out */
void spc_init_header( void* spc_out );
/* Saves emulator state as SPC file data. Writes spc_file_size bytes to spc_out.
Does not set up SPC header; use spc_init_header() for that. */
enum { spc_file_size = 0x10200 }; /* spc_out must have this many bytes allocated */
void spc_save_spc( SNES_SPC*, void* spc_out );
/* Returns non-zero if new key-on events occurred since last check. Useful for
trimming silence while saving an SPC. */
int spc_check_kon( SNES_SPC* );
/**** SPC_Filter ****/
typedef struct SPC_Filter SPC_Filter;
/* Creates new filter. NULL if out of memory. */
SPC_Filter* spc_filter_new( void );
/* Frees filter */
void spc_filter_delete( SPC_Filter* );
/* Filters count samples of stereo sound in place. Count must be a multiple of 2. */
void spc_filter_run( SPC_Filter*, spc_sample_t* io, int count );
/* Clears filter to silence */
void spc_filter_clear( SPC_Filter* );
/* Sets gain (volume), where spc_filter_gain_unit is normal. Gains greater than
spc_filter_gain_unit are fine, since output is clamped to 16-bit sample range. */
enum { spc_filter_gain_unit = 0x100 };
void spc_filter_set_gain( SPC_Filter*, int gain );
/* Sets amount of bass (logarithmic scale) */
enum { spc_filter_bass_none = 0 };
enum { spc_filter_bass_norm = 8 }; /* normal amount */
enum { spc_filter_bass_max = 31 };
void spc_filter_set_bass( SPC_Filter*, int bass );
#ifdef __cplusplus
}
#endif
#endif

161
waterbox/sameboy/timing.c
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#include "gb.h"
#ifdef _WIN32
#define _WIN32_WINNT 0x0500
#include <Windows.h>
#else
#include <sys/time.h>
#endif
static void GB_ir_run(GB_gameboy_t *gb)
{
if (gb->ir_queue_length == 0) return;
if (gb->cycles_since_input_ir_change >= gb->ir_queue[0].delay) {
gb->cycles_since_input_ir_change -= gb->ir_queue[0].delay;
gb->infrared_input = gb->ir_queue[0].state;
gb->ir_queue_length--;
memmove(&gb->ir_queue[0], &gb->ir_queue[1], sizeof(gb->ir_queue[0]) * (gb->ir_queue_length));
}
}
static void advance_tima_state_machine(GB_gameboy_t *gb)
{
if (gb->tima_reload_state == GB_TIMA_RELOADED) {
gb->tima_reload_state = GB_TIMA_RUNNING;
}
else if (gb->tima_reload_state == GB_TIMA_RELOADING) {
gb->tima_reload_state = GB_TIMA_RELOADED;
}
}
void GB_advance_cycles(GB_gameboy_t *gb, uint8_t cycles)
{
// Affected by speed boost
gb->dma_cycles += cycles;
advance_tima_state_machine(gb);
for (int i = 0; i < cycles; i += 4) {
GB_set_internal_div_counter(gb, gb->div_cycles + 4);
}
if (cycles > 4) {
advance_tima_state_machine(gb);
if (cycles > 8) {
advance_tima_state_machine(gb);
}
}
uint16_t previous_serial_cycles = gb->serial_cycles;
gb->serial_cycles += cycles;
if (gb->serial_length) {
if ((gb->serial_cycles & gb->serial_length) != (previous_serial_cycles & gb->serial_length)) {
gb->serial_length = 0;
gb->io_registers[GB_IO_SC] &= ~0x80;
/* TODO: Does SB "update" bit by bit? */
if (gb->serial_transfer_end_callback) {
gb->io_registers[GB_IO_SB] = gb->serial_transfer_end_callback(gb);
}
else {
gb->io_registers[GB_IO_SB] = 0xFF;
}
gb->io_registers[GB_IO_IF] |= 8;
}
}
if (gb->cgb_double_speed) {
cycles >>=1;
}
// Not affected by speed boost
gb->hdma_cycles += cycles;
gb->apu.apu_cycles += cycles;
gb->cycles_since_ir_change += cycles;
gb->cycles_since_input_ir_change += cycles;
gb->cycles_since_epoch += cycles >> 1;
GB_dma_run(gb);
GB_hdma_run(gb);
GB_apu_run(gb);
GB_display_run(gb, cycles);
GB_ir_run(gb);
}
/* Standard Timers */
static const unsigned int GB_TAC_RATIOS[] = {1024, 16, 64, 256};
static void increase_tima(GB_gameboy_t *gb)
{
gb->io_registers[GB_IO_TIMA]++;
if (gb->io_registers[GB_IO_TIMA] == 0) {
gb->io_registers[GB_IO_TIMA] = gb->io_registers[GB_IO_TMA];
gb->io_registers[GB_IO_IF] |= 4;
gb->tima_reload_state = GB_TIMA_RELOADING;
}
}
static bool counter_overflow_check(uint32_t old, uint32_t new, uint32_t max)
{
return (old & (max >> 1)) && !(new & (max >> 1));
}
void GB_set_internal_div_counter(GB_gameboy_t *gb, uint32_t value)
{
/* TIMA increases when a specific high-bit becomes a low-bit. */
value &= INTERNAL_DIV_CYCLES - 1;
if ((gb->io_registers[GB_IO_TAC] & 4) &&
counter_overflow_check(gb->div_cycles, value, GB_TAC_RATIOS[gb->io_registers[GB_IO_TAC] & 3])) {
increase_tima(gb);
}
gb->div_cycles = value;
}
/*
This glitch is based on the expected results of mooneye-gb rapid_toggle test.
This glitch happens because how TIMA is increased, see GB_set_internal_div_counter.
According to GiiBiiAdvance, GBC's behavior is different, but this was not tested or implemented.
*/
void GB_emulate_timer_glitch(GB_gameboy_t *gb, uint8_t old_tac, uint8_t new_tac)
{
/* Glitch only happens when old_tac is enabled. */
if (!(old_tac & 4)) return;
unsigned int old_clocks = GB_TAC_RATIOS[old_tac & 3];
unsigned int new_clocks = GB_TAC_RATIOS[new_tac & 3];
/* The bit used for overflow testing must have been 1 */
if (gb->div_cycles & (old_clocks >> 1)) {
/* And now either the timer must be disabled, or the new bit used for overflow testing be 0. */
if (!(new_tac & 4) || gb->div_cycles & (new_clocks >> 1)) {
increase_tima(gb);
}
}
}
void GB_rtc_run(GB_gameboy_t *gb)
{
if ((gb->rtc_real.high & 0x40) == 0) { /* is timer running? */
time_t current_time = gb->frontend_rtc_time;
while (gb->last_rtc_second < current_time) {
gb->last_rtc_second++;
if (++gb->rtc_real.seconds == 60)
{
gb->rtc_real.seconds = 0;
if (++gb->rtc_real.minutes == 60)
{
gb->rtc_real.minutes = 0;
if (++gb->rtc_real.hours == 24)
{
gb->rtc_real.hours = 0;
if (++gb->rtc_real.days == 0)
{
if (gb->rtc_real.high & 1) /* Bit 8 of days*/
{
gb->rtc_real.high |= 0x80; /* Overflow bit */
}
gb->rtc_real.high ^= 1;
}
}
}
}
}
}
}

18
waterbox/sameboy/timing.h
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#ifndef timing_h
#define timing_h
#include "gb.h"
#ifdef GB_INTERNAL
void GB_advance_cycles(GB_gameboy_t *gb, uint8_t cycles);
void GB_set_internal_div_counter(GB_gameboy_t *gb, uint32_t value);
void GB_rtc_run(GB_gameboy_t *gb);
void GB_emulate_timer_glitch(GB_gameboy_t *gb, uint8_t old_tac, uint8_t new_tac);
enum {
GB_TIMA_RUNNING = 0,
GB_TIMA_RELOADING = 1,
GB_TIMA_RELOADED = 2
};
#endif
#endif /* timing_h */

1375
waterbox/sameboy/z80_cpu.c
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10
waterbox/sameboy/z80_cpu.h
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#ifndef z80_cpu_h
#define z80_cpu_h
#include "gb.h"
void GB_cpu_disassemble(GB_gameboy_t *gb, uint16_t pc, uint16_t count);
#ifdef GB_INTERNAL
void GB_cpu_run(GB_gameboy_t *gb);
#endif
#endif /* z80_cpu_h */