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amebo.js
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amebo.js
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//amebo gameboy colour emulator by riperiperi
//"use strict"; despite my code conforming to strict mode, i'll keep it off because it just adds stupid extra checks which might slow things down
window.onerror = function myErrorHandler(errorMsg, url, lineNumber) {
alert(errorMsg+" on line "+lineNumber);
}
window.GBMasterClass = function() {
var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
window.requestAnimationFrame = requestAnimationFrame;
this.gameboys = [];
var gameboys = this.gameboys;
function update() {
if (gameboys.length > 1) multiGBUpdate();
else if (gameboys.length == 1) gameboys[0].audioSyncUpdate();
window.requestAnimationFrame(update);
}
function multiGBUpdate() {
var gbl = gameboys.length
for (var gbn=0; gbn<gbl; gbn++) {
if (!(gameboys[gbn].options.cButByte)) gameboys[gbn].prepareButtonByte();
}
var mostCycles = 0;
while (mostCycles<70224) {
for (var gbn=0; gbn<gbl; gbn++) {
while (gameboys[gbn].frameCycles <= Math.min(mostCycles, 70223)) gameboys[gbn].cycle();
mostCycles = gameboys[gbn].frameCycles
}
}
for (var gbn=0; gbn<gbl; gbn++) {
gameboys[gbn].frameCycles -= 70224;
}
}
window.requestAnimationFrame(update);
}
window.gb = function(file, canvas, options) {
//alert(checkEndian());
if (options == null) {
var options = {rootDir:""}
}
this.options = options;
if (typeof window.GBMaster == "undefined") window.GBMaster = new window.GBMasterClass();
var sadGB = "data:image/gif;base64,R0lGODlhGQArAIAAAP///wAAACH5BAAHAP8ALAAAAAAZACsAAAKORI6pewYPo5yvGYZRDTf721Gi1mjiRHKmKrFhaTkolIYOF7m1eeawTaugfjwarkWM9Taq5pGpfDlzSGMTeMLtor2tJwNSUI5i2BcD6pwTmyG4ulxy43D6iPy0x+aj9iLuVdQSlFY4FrWXN1NnN9R493gY6Xg4JaSlKHdjqCfDl7X5CYqZqeck6IYKxUBRAAA7";
//image used for errors, takes up space but you've got to love it tho
this.RSToff = 0; //used by gbs player
this.paused = false;
this.loadState = loadState;
this.saveState = saveState;
window.addEventListener("unload", saveBattery)
var GBObj = this;
this.loadROM = function(url, pauseAfter) {
var loadfile = new XMLHttpRequest();
loadfile.open("GET", url);
loadfile.responseType = "arraybuffer";
loadfile.send();
var filename = url.split("/");
GBObj.filename = filename[filename.length-1];
GBObj.paused = true;
loadfile.onprogress = drawProgress;
loadfile.onreadystatechange = function() {this.mime = this.getResponseHeader('content-type');};
loadfile.onload = function() {
GBObj.paused = (pauseAfter||false);
if ((loadfile.mime == "application/zip") && (JSZip != null)) {
var zip = new JSZip(loadfile.response);
var file = zip.file(/.gb/)[0];
GBObj.filename = file.name;
GBObj.loadROMBuffer(file.asArrayBuffer()); //load first file with extension .gb or .gbc
} else GBObj.loadROMBuffer(loadfile.response);
}
loadfile.onerror = function() {
alert("Failed to load "+url+"! Are CORS requests enabled on the server?")
}
}
this.loadROMBuffer = function(buffer, battery) { //battery is an optional parameter
if (buffer instanceof ArrayBuffer) game = new Uint8Array(buffer);
else if (buffer instanceof Uint8Array) game = buffer;
else alert(buffer);
GBObj.game = game;
gameLoaded = true;
if (battery != null) {
ROMID = generateUniqueName();
CRAM = new Uint8Array(battery);
saveBattery();
}
if (biosLoaded == 2) init();
}
var internalCanvas = document.createElement("canvas");
internalCanvas.width = 160;
internalCanvas.height = 144;
this.internalCanvas = internalCanvas;
var internalCtx = internalCanvas.getContext("2d");
if (canvas == null) canvas = internalCanvas; //if we have no output, display to self.
this.canvas = canvas; //output canvas
var ctx = canvas.getContext("2d");
if (typeof ctx.webkitImageSmoothingEnabled != "undefined") {
ctx.webkitImageSmoothingEnabled = false;
} else if (typeof ctx.imageSmoothingEnabled != "undefined") {
ctx.imageSmoothingEnabled = false;
} else {
console.log("imageSmoothingEnabled not supported, falling back to css scaling")
canvas.style.width = canvas.width+"px";
canvas.style.height = canvas.height+"px";
canvas.width = 160;
canvas.height = 144;
}
this.ctx = ctx;
var colours = [[219, 255, 134, 255], [194, 226, 33, 255], [73, 156, 27, 255], [15, 86, 47, 255]]
this.file = file;
var gameLoaded = false;
var biosLoaded = 0;
var GBAudioContext = null;
var getGamepads = navigator.webkitGamepads || navigator.webkitGetGamepads || navigator.getGamepads;
var p = navigator.platform
var iOS = ( p === 'iPad' || p === 'iPhone' || p === 'iPod' );
if (iOS) setInterval(saveBattery, 1000);
var NoAudioAPI = false;
if (typeof AudioContext !== 'undefined') {
GBAudioContext = new AudioContext();
} else if (typeof webkitAudioContext !== 'undefined') {
GBAudioContext = new webkitAudioContext();
} else {
NoAudioAPI = true;
}
var stereo = true;
//if (iOS) NoAudioAPI = true;
if (NoAudioAPI) {
//audio api is so integrated that i have to make all nodes dummy objects to keep things functioning
//since the AudioEngine objects are still used in audio emulation (which is still needed)
//please forgive me for this hacky disaster
GBAudioContext = {
createGain: function() { return { gain:{value:0}, connect:function(){} } },
createChannelMerger: function(a) { return { connect:function(){} } },
createScriptProcessor: function(a, b, c) { return { connect:function(){} } },
sampleRate: 0 //this will make cyclesForSample equal infinity, and no audio will ever be produced. ;)
}
}
window.addEventListener('touchstart', function() {
var buffer = GBAudioContext.createBuffer(1, 1, 22050);
var source = GBAudioContext.createBufferSource();
source.buffer = buffer;
source.connect(GBAudioContext.destination);
source.start(0);
}, false);
this.scopeEval = function(code) {return eval(code)}
var registers, flags, SP, PC, Cycles, IME, game, bios, CGBbios, MemRead, MemWrite, VRAM, RAM, OAM, IORAM, ZRAM, CRAM, biosActive,
vblankComplete, lineCycles, GBScreen, buttonByte, paused, masterClock, frameskip, timeStart, sampleNumber,
MBC, MBCReadHandler, MBCWriteHandler, AudioEngine, AudioMerge, soundLout, soundRout, audioSampleRate, LCDstate, halted,
palettes, palettesInt32, ROMID, timerCounts, WaveRAMCycles, CGB, CGBDMA, CPUSpeed, CGBBGPal, CGBBGPalReg, CGBSprPal, CGBSprPalReg,
tileLayerData = new Uint8Array(160), tileLayerPalette = new Uint8Array(160), emptyTileLayer = new Uint8Array(160), bufferSize,
audioSyncFrames, soundCycles, soundPhase, timerCycles, audioCycles, cyclesForSample, divCounts, CGBInt32BG, CGBInt32Spr
var registerDebug, instCount;
GBScreen = internalCtx.createImageData(160, 144);
var EmptyImageBuffer = new Uint8Array(GBScreen.data.length);
var GBScreenInt32 = new Uint32Array(GBScreen.data.buffer);
var keyConfig = {
A: 88,
B: 90,
SELECT: 32,
START: 13,
UP: 38,
DOWN: 40,
LEFT: 37,
RIGHT: 39
}
this.keyConfig = keyConfig; //allow public access
var controlKeyConfig = {
STATES: [112, 113, 114, 115, 116, 117, 118, 119, 120, 121]
}
if (file != null) this.loadROM(file);
var loadbios = new XMLHttpRequest();
loadbios.open("GET", options.rootDir+"dmgbios.bin");
loadbios.responseType = "arraybuffer";
loadbios.send();
loadbios.onload = function() {
if (loadbios.status == 200) bios = new Uint8Array(loadbios.response);
biosLoaded++;
if (gameLoaded && (biosLoaded == 2)) init();
}
loadbios.onerror = function() {
biosLoaded++;
if (gameLoaded && (biosLoaded == 2)) init();
}
var loadCGBbios = new XMLHttpRequest();
loadCGBbios.open("GET", options.rootDir+"gbcbios.bin");
loadCGBbios.responseType = "arraybuffer";
loadCGBbios.send();
loadCGBbios.onload = function() {
if (loadCGBbios.status == 200) CGBbios = new Uint8Array(loadCGBbios.response);
biosLoaded++;
if (gameLoaded && (biosLoaded == 2)) init();
}
loadCGBbios.onerror = function() {
biosLoaded++;
if (gameLoaded && (biosLoaded == 2)) init();
}
var keysArray = new Array(256);
for (var i=0; i<256; i++) {
keysArray[i] = 1;
}
document.addEventListener("keydown", keyDownHandler, false);
document.addEventListener("keyup", keyUpHandler, false);
function keyDownHandler(evt) {
keysArray[evt.keyCode] = 0;
var stateNum = controlKeyConfig.STATES.indexOf(evt.keyCode)
if (stateNum != -1) {
evt.preventDefault();
if (keysArray[16] == 0) {
localStorage["states/"+stateNum] = JSON.stringify(saveState());
} else {
var tstate = localStorage["states/"+stateNum];
if (typeof tstate != "undefined") loadState(JSON.parse(tstate));
}
}
}
function keyUpHandler(evt) {
keysArray[evt.keyCode] = 1;
}
function getROMName() {
var name = "";
for (var i=0x134; i<=0x143; i++) {
if (game[i] == 0) break;
name += String.fromCharCode(game[i])
}
return name;
}
function generateUniqueName() {
var sum = 0;
for (var i=0; i<game.length; i++) {
sum = (sum + game[i])%4294967295
}
var name = "";
for (var i=0x134; i<=0x143; i++) {
name += String.fromCharCode(game[i])
}
return name+sum;
}
var Instructions = //cue ridiculously large table
[
NOP, function(){LD16M(1)}, function(){LDMA(1)}, function(){INC16(1)}, function(){INC(1)}, function(){DEC(1)}, function(){LDM(1)}, function(){RLC(0); flags[0] = 0}, LDSP, function(){ADDHL16(1)}, function(){LDAM(1)}, function(){DEC16(1)}, function(){INC(2)}, function(){DEC(2)}, function(){LDM(2)}, function(){RRC(0); flags[0] = 0},
STOP, function(){LD16M(3)}, function(){LDMA(3)}, function(){INC16(3)}, function(){INC(3)}, function(){DEC(3)}, function(){LDM(3)}, function(){RL(0); flags[0] = 0}, function(){JR(4, 1)}, function(){ADDHL16(3)}, function(){LDAM(3)}, function(){DEC16(3)}, function(){INC(4)}, function(){DEC(4)}, function(){LDM(4)}, function(){RR(0); flags[0] = 0},
function(){JR(0, 0)}, function(){LD16M(5)}, function(){LDMA(5); CHL(1)}, function(){INC16(5)}, function(){INC(5)}, function(){DEC(5)}, function(){LDM(5)}, DAA, function(){JR(0, 1)}, function(){ADDHL16(5)}, function(){LDAM(5); CHL(1)}, function(){DEC16(5)}, function(){INC(6)}, function(){DEC(6)}, function(){LDM(6)}, CPL,
function(){JR(3, 0)}, LDSPM, function(){LDMA(5); CHL(-1)}, INCSP, INCHL, DECHL, LDHLM, SCF, function(){JR(3, 1)}, ADDHLSP, function(){LDAM(5); CHL(-1)}, DECSP, function(){INC(0)}, function(){DEC(0)}, function(){LDM(0)}, CCF,
function(){LD(1, 1)}, function(){LD(1, 2)}, function(){LD(1, 3)}, function(){LD(1, 4)}, function(){LD(1, 5)}, function(){LD(1, 6)}, function(){LDFHL(1)}, function(){LD(1, 0)}, function(){LD(2, 1)}, function(){LD(2, 2)}, function(){LD(2, 3)}, function(){LD(2, 4)}, function(){LD(2, 5)}, function(){LD(2, 6)}, function(){LDFHL(2)}, function(){LD(2, 0)},
function(){LD(3, 1)}, function(){LD(3, 2)}, function(){LD(3, 3)}, function(){LD(3, 4)}, function(){LD(3, 5)}, function(){LD(3, 6)}, function(){LDFHL(3)}, function(){LD(3, 0)}, function(){LD(4, 1)}, function(){LD(4, 2)}, function(){LD(4, 3)}, function(){LD(4, 4)}, function(){LD(4, 5)}, function(){LD(4, 6)}, function(){LDFHL(4)}, function(){LD(4, 0)},
function(){LD(5, 1)}, function(){LD(5, 2)}, function(){LD(5, 3)}, function(){LD(5, 4)}, function(){LD(5, 5)}, function(){LD(5, 6)}, function(){LDFHL(5)}, function(){LD(5, 0)}, function(){LD(6, 1)}, function(){LD(6, 2)}, function(){LD(6, 3)}, function(){LD(6, 4)}, function(){LD(6, 5)}, function(){LD(6, 6)}, function(){LDFHL(6)}, function(){LD(6, 0)},
function(){LDTHL(1)}, function(){LDTHL(2)}, function(){LDTHL(3)}, function(){LDTHL(4)}, function(){LDTHL(5)}, function(){LDTHL(6)}, HALT, function(){LDTHL(0)}, function(){LD(0, 1)}, function(){LD(0, 2)}, function(){LD(0, 3)}, function(){LD(0, 4)}, function(){LD(0, 5)}, function(){LD(0, 6)}, function(){LDFHL(0)}, function(){LD(0, 0)},
function(){ADD(1)}, function(){ADD(2)}, function(){ADD(3)}, function(){ADD(4)}, function(){ADD(5)}, function(){ADD(6)}, ADDHL, function(){ADD(0)}, function(){ADC(1)}, function(){ADC(2)}, function(){ADC(3)}, function(){ADC(4)}, function(){ADC(5)}, function(){ADC(6)}, ADCHL, function(){ADC(0)},
function(){SUB(1)}, function(){SUB(2)}, function(){SUB(3)}, function(){SUB(4)}, function(){SUB(5)}, function(){SUB(6)}, SUBHL, function(){SUB(0)}, function(){SBC(1)}, function(){SBC(2)}, function(){SBC(3)}, function(){SBC(4)}, function(){SBC(5)}, function(){SBC(6)}, SBCHL, function(){SBC(0)},
function(){AND(1)}, function(){AND(2)}, function(){AND(3)}, function(){AND(4)}, function(){AND(5)}, function(){AND(6)}, ANDHL, function(){AND(0)}, function(){XOR(1)}, function(){XOR(2)}, function(){XOR(3)}, function(){XOR(4)}, function(){XOR(5)}, function(){XOR(6)}, XORHL, function(){XOR(0)},
function(){OR(1)}, function(){OR(2)}, function(){OR(3)}, function(){OR(4)}, function(){OR(5)}, function(){OR(6)}, ORHL, function(){OR(0)}, function(){CP(1)}, function(){CP(2)}, function(){CP(3)}, function(){CP(4)}, function(){CP(5)}, function(){CP(6)}, CPHL, function(){CP(0)},
function(){RET(0, 0)}, function(){POP(1)}, function(){JP(0, 0)}, function(){JP(4, 1)}, function(){CALL(0, 0)}, function(){PUSH(1)}, ADDM, function(){RST(0)}, function(){RET(0, 1)}, NRET, function(){JP(0, 1)}, PrefixCB, function(){CALL(0, 1)}, function(){CALL(4, 1)}, ADCM, function(){RST(8)},
function(){RET(3, 0)}, function(){POP(3)}, function(){JP(3, 0)}, UNIMP, function(){CALL(3, 0)}, function(){PUSH(3)}, SUBM, function(){RST(16)}, function(){RET(3, 1)}, function(){EI(); NRET()}, function(){JP(3, 1)}, UNIMP, function(){CALL(3, 1)}, UNIMP, SBCM, function(){RST(24)},
LDH_M_A, function(){POP(5)}, LDH_C_A, UNIMP, UNIMP, function(){PUSH(5)}, ANDM, function(){RST(32)}, ADDSP, JPHL, LD_M_A, UNIMP, UNIMP, UNIMP, XORM, function(){RST(40)},
LDH_A_M, POPAF, LDH_A_C, DI, UNIMP, PUSHAF, ORM, function(){RST(48)}, LD_HL_SPM, LDSPHL, LD_A_M, EI, UNIMP, UNIMP, CPM, function(){RST(56)}
]
var PrefixCBI =
[
function(){RLC(1)}, function(){RLC(2)}, function(){RLC(3)}, function(){RLC(4)}, function(){RLC(5)}, function(){RLC(6)}, RLCHL, function(){RLC(0)}, function(){RRC(1)}, function(){RRC(2)}, function(){RRC(3)}, function(){RRC(4)}, function(){RRC(5)}, function(){RRC(6)}, RRCHL, function(){RRC(0)},
function(){RL(1)}, function(){RL(2)}, function(){RL(3)}, function(){RL(4)}, function(){RL(5)}, function(){RL(6)}, RLHL, function(){RL(0)}, function(){RR(1)}, function(){RR(2)}, function(){RR(3)}, function(){RR(4)}, function(){RR(5)}, function(){RR(6)}, RRHL, function(){RR(0)},
function(){SLA(1)}, function(){SLA(2)}, function(){SLA(3)}, function(){SLA(4)}, function(){SLA(5)}, function(){SLA(6)}, SLAHL, function(){SLA(0)},function(){SRA(1)}, function(){SRA(2)}, function(){SRA(3)}, function(){SRA(4)}, function(){SRA(5)}, function(){SRA(6)}, SRAHL, function(){SRA(0)},
function(){SWAP(1)}, function(){SWAP(2)}, function(){SWAP(3)}, function(){SWAP(4)}, function(){SWAP(5)}, function(){SWAP(6)}, SWAPHL, function(){SWAP(0)},function(){SRL(1)}, function(){SRL(2)}, function(){SRL(3)}, function(){SRL(4)}, function(){SRL(5)}, function(){SRL(6)}, SRLHL, function(){SRL(0)},
function(){BIT(0, 1)}, function(){BIT(0, 2)}, function(){BIT(0, 3)}, function(){BIT(0, 4)}, function(){BIT(0, 5)}, function(){BIT(0, 6)}, function(){BITHL(0)}, function(){BIT(0, 0)}, function(){BIT(1, 1)}, function(){BIT(1, 2)}, function(){BIT(1, 3)}, function(){BIT(1, 4)}, function(){BIT(1, 5)}, function(){BIT(1, 6)}, function(){BITHL(1)}, function(){BIT(1, 0)},
function(){BIT(2, 1)}, function(){BIT(2, 2)}, function(){BIT(2, 3)}, function(){BIT(2, 4)}, function(){BIT(2, 5)}, function(){BIT(2, 6)}, function(){BITHL(2)}, function(){BIT(2, 0)}, function(){BIT(3, 1)}, function(){BIT(3, 2)}, function(){BIT(3, 3)}, function(){BIT(3, 4)}, function(){BIT(3, 5)}, function(){BIT(3, 6)}, function(){BITHL(3)}, function(){BIT(3, 0)},
function(){BIT(4, 1)}, function(){BIT(4, 2)}, function(){BIT(4, 3)}, function(){BIT(4, 4)}, function(){BIT(4, 5)}, function(){BIT(4, 6)}, function(){BITHL(4)}, function(){BIT(4, 0)}, function(){BIT(5, 1)}, function(){BIT(5, 2)}, function(){BIT(5, 3)}, function(){BIT(5, 4)}, function(){BIT(5, 5)}, function(){BIT(5, 6)}, function(){BITHL(5)}, function(){BIT(5, 0)},
function(){BIT(6, 1)}, function(){BIT(6, 2)}, function(){BIT(6, 3)}, function(){BIT(6, 4)}, function(){BIT(6, 5)}, function(){BIT(6, 6)}, function(){BITHL(6)}, function(){BIT(6, 0)}, function(){BIT(7, 1)}, function(){BIT(7, 2)}, function(){BIT(7, 3)}, function(){BIT(7, 4)}, function(){BIT(7, 5)}, function(){BIT(7, 6)}, function(){BITHL(7)}, function(){BIT(7, 0)},
function(){RES(0, 1)}, function(){RES(0, 2)}, function(){RES(0, 3)}, function(){RES(0, 4)}, function(){RES(0, 5)}, function(){RES(0, 6)}, function(){RESHL(0)}, function(){RES(0, 0)}, function(){RES(1, 1)}, function(){RES(1, 2)}, function(){RES(1, 3)}, function(){RES(1, 4)}, function(){RES(1, 5)}, function(){RES(1, 6)}, function(){RESHL(1)}, function(){RES(1, 0)},
function(){RES(2, 1)}, function(){RES(2, 2)}, function(){RES(2, 3)}, function(){RES(2, 4)}, function(){RES(2, 5)}, function(){RES(2, 6)}, function(){RESHL(2)}, function(){RES(2, 0)}, function(){RES(3, 1)}, function(){RES(3, 2)}, function(){RES(3, 3)}, function(){RES(3, 4)}, function(){RES(3, 5)}, function(){RES(3, 6)}, function(){RESHL(3)}, function(){RES(3, 0)},
function(){RES(4, 1)}, function(){RES(4, 2)}, function(){RES(4, 3)}, function(){RES(4, 4)}, function(){RES(4, 5)}, function(){RES(4, 6)}, function(){RESHL(4)}, function(){RES(4, 0)}, function(){RES(5, 1)}, function(){RES(5, 2)}, function(){RES(5, 3)}, function(){RES(5, 4)}, function(){RES(5, 5)}, function(){RES(5, 6)}, function(){RESHL(5)}, function(){RES(5, 0)},
function(){RES(6, 1)}, function(){RES(6, 2)}, function(){RES(6, 3)}, function(){RES(6, 4)}, function(){RES(6, 5)}, function(){RES(6, 6)}, function(){RESHL(6)}, function(){RES(6, 0)}, function(){RES(7, 1)}, function(){RES(7, 2)}, function(){RES(7, 3)}, function(){RES(7, 4)}, function(){RES(7, 5)}, function(){RES(7, 6)}, function(){RESHL(7)}, function(){RES(7, 0)},
function(){SET(0, 1)}, function(){SET(0, 2)}, function(){SET(0, 3)}, function(){SET(0, 4)}, function(){SET(0, 5)}, function(){SET(0, 6)}, function(){SETHL(0)}, function(){SET(0, 0)}, function(){SET(1, 1)}, function(){SET(1, 2)}, function(){SET(1, 3)}, function(){SET(1, 4)}, function(){SET(1, 5)}, function(){SET(1, 6)}, function(){SETHL(1)}, function(){SET(1, 0)},
function(){SET(2, 1)}, function(){SET(2, 2)}, function(){SET(2, 3)}, function(){SET(2, 4)}, function(){SET(2, 5)}, function(){SET(2, 6)}, function(){SETHL(2)}, function(){SET(2, 0)}, function(){SET(3, 1)}, function(){SET(3, 2)}, function(){SET(3, 3)}, function(){SET(3, 4)}, function(){SET(3, 5)}, function(){SET(3, 6)}, function(){SETHL(3)}, function(){SET(3, 0)},
function(){SET(4, 1)}, function(){SET(4, 2)}, function(){SET(4, 3)}, function(){SET(4, 4)}, function(){SET(4, 5)}, function(){SET(4, 6)}, function(){SETHL(4)}, function(){SET(4, 0)}, function(){SET(5, 1)}, function(){SET(5, 2)}, function(){SET(5, 3)}, function(){SET(5, 4)}, function(){SET(5, 5)}, function(){SET(5, 6)}, function(){SETHL(5)}, function(){SET(5, 0)},
function(){SET(6, 1)}, function(){SET(6, 2)}, function(){SET(6, 3)}, function(){SET(6, 4)}, function(){SET(6, 5)}, function(){SET(6, 6)}, function(){SETHL(6)}, function(){SET(6, 0)}, function(){SET(7, 1)}, function(){SET(7, 2)}, function(){SET(7, 3)}, function(){SET(7, 4)}, function(){SET(7, 5)}, function(){SET(7, 6)}, function(){SETHL(7)}, function(){SET(7, 0)},
]
// ----- State Load/Save -----
function byteToString(byteArray, noBase64) {
if (typeof byteArray == "undefined") return;
var string = ""
for (var i=0; i<byteArray.length; i++) {
string += String.fromCharCode(byteArray[i]);
}
return (noBase64||false)?string:btoa(string); //i have to base64 encode because JSON.stringify encodes unusual characters like \u1234
}
function stringToByte(string, noBase64) {
var string = (noBase64||false)?string:atob(string);
if (typeof string == "undefined") return; //so incomplete states don't cause errors.
var byteArray = new Uint8Array(string.length)
for (var i=0; i<byteArray.length; i++) {
byteArray[i] = string.charCodeAt(i);
}
return byteArray;
}
function saveState() {
return {
VRAM: byteToString(VRAM),
RAM: byteToString(RAM),
OAM: byteToString(OAM),
IORAM: byteToString(IORAM),
ZRAM: byteToString(ZRAM),
CRAM: byteToString(CRAM) || "",
CGBDMA: CGBDMA,
CGBBGPalReg: byteToString(CGBBGPalReg) || "",
CGBSprPalReg: byteToString(CGBSprPalReg) || "",
CPUSpeed: CPUSpeed,
MBC: MBC,
registers: byteToString(registers),
flags: flags,
SP: SP,
PC: PC,
biosActive: biosActive,
IME: IME,
LCDstate: LCDstate,
CycleTimers: {
masterClock: masterClock,
lineCycles: lineCycles,
soundCycles: soundCycles,
soundPhase: soundPhase,
timerCycles: timerCycles,
audioCycles: audioCycles,
divCounts: divCounts,
//timerCounts: timerCounts
},
AudioEngine: objectifyAudioEngine()
};
}
function loadState(obj) {
VRAM = stringToByte(obj.VRAM);
RAM = stringToByte(obj.RAM);
OAM = stringToByte(obj.OAM);
IORAM = stringToByte(obj.IORAM);
ZRAM = stringToByte(obj.ZRAM);
CRAM = stringToByte(obj.CRAM);
if (CGB) {
CGBDMA = obj.CGBDMA;
CGBBGPalReg = stringToByte(obj.CGBBGPalReg);
CGBSprPalReg = stringToByte(obj.CGBSprPalReg);
CPUSpeed = obj.CPUSpeed;
restorePal(CGBBGPalReg, CGBBGPal);
restorePal(CGBSprPalReg, CGBSprPal);
}
MBC = obj.MBC;
registers = stringToByte(obj.registers);
flags = obj.flags;
SP = obj.SP;
PC = obj.PC;
biosActive = obj.biosActive;
IME = obj.IME;
LCDstate = obj.LCDstate;
masterClock = obj.CycleTimers.masterClock;
lineCycles = obj.CycleTimers.lineCycles;
soundCycles = obj.CycleTimers.soundCycles;
soundPhase = obj.CycleTimers.soundPhase;
timerCycles = obj.CycleTimers.timerCycles;
audioCycles = obj.CycleTimers.audioCycles;
divCounts = obj.CycleTimers.divCounts;
//timerCounts = obj.CycleTimers.timerCounts;
restoreAudioEngine(obj.AudioEngine);
audioSyncFrames = 0;
cyclesForSample = (4194304*CPUSpeed)/audioSampleRate;
palettes.set(readDMGPalette(0), 0);
palettes.set(readDMGPalette(1), 16);
palettes.set(readDMGPalette(2), 32);
}
function restorePal(reg, dest) {
for (var i=0; i<32; i++) {
var mult = 8.225806451612904;
dest.set([Math.round((reg[i*2]&0x1F)*mult), Math.round(((reg[i*2]>>5)+((reg[i*2+1]&3)<<3))*mult), Math.round(((reg[i*2+1]&0x7C)>>2)*mult), 255], i*4);
//dest[i] = [Math.round((reg[i*2]&0x1F)*mult), Math.round(((reg[i*2]>>5)+((reg[i*2+1]&3)<<3))*mult), Math.round(((reg[i*2+1]&0x7C)>>2)*mult)]
}
}
function testSaveState() {
savewhatever = JSON.stringify(saveState());
}
function testLoadState() {
loadState(JSON.parse(savewhatever));
}
function objectifyAudioEngine() {
var obj = {}
if (typeof AudioEngine == "undefined") return null;
for (var i=0; i<4; i++) {
obj[i] = {
frequency: AudioEngine[i].frequency,
duty: AudioEngine[i].duty,
phase: AudioEngine[i].phase,
volume: AudioEngine[i].volume,
lEnable: AudioEngine[i].lEnable,
rEnable: AudioEngine[i].rEnable,
esweep: AudioEngine[i].esweep,
freqreg: AudioEngine[i].freqreg,
fsweep: AudioEngine[i].fsweep,
lengthCtr: AudioEngine[i].lengthCtr,
volreg: AudioEngine[i].volreg,
sampleNumber: AudioEngine[i].sampleNumber
};
}
obj[3].LFSR = AudioEngine[3].LFSR
obj[3].frequency = AudioEngine[3].frequency
obj.lVolume = AudioEngine.lVolume;
obj.rVolume = AudioEngine.rVolume;
obj.avgVol = AudioEngine.avgVol;
return obj;
}
function restoreAudioEngine(obj) {
for (var i=0; i<4; i++) {
AudioEngine[i].frequency = obj[i].frequency;
AudioEngine[i].duty = obj[i].duty;
AudioEngine[i].phase = obj[i].phase;
AudioEngine[i].volume = obj[i].volume;
AudioEngine[i].lEnable = obj[i].lEnable;
AudioEngine[i].rEnable = obj[i].rEnable;
AudioEngine[i].esweep = obj[i].esweep;
AudioEngine[i].freqreg = obj[i].freqreg;
AudioEngine[i].fsweep = obj[i].fsweep;
AudioEngine[i].lengthCtr = obj[i].lengthCtr;
AudioEngine[i].volreg = obj[i].volreg;
AudioEngine[i].sampleNumber = obj[i].sampleNumber;
}
AudioEngine[3].LFSR = obj[3].LFSR;
AudioEngine[3].frequency = obj[3].frequency;
AudioEngine.lVolume = obj.lVolume;
AudioEngine.rVolume = obj.rVolume;
AudioEngine.avgVol = obj.avgVol;
}
// ----- I/O EMULATION -----
var IOReadFunctions = [];
var IOWriteFunctions = [];
IOWriteFunctions[0x04] = function(a, b){
IORAM[b] = 0;
};
IOWriteFunctions[0x07] = function(a, b){
//if ((a&4) ^ (IORAM[0x07]&4)) timerCounts = 0;
IORAM[b] = a;
};
IOReadFunctions[0x05] = function(a) {
return IORAM[a];
}
IOWriteFunctions[0x43] = function(a, b) {
IORAM[b] = a;
}
IOWriteFunctions[0x40] = function(a, b){
if ((IORAM[0x40]&0x80) != (a&0x80)) {
if (a&0x80) {
IORAM[0x44] = 0;
lineCycles = 0;
LCDstate = 2;
if (IORAM[0x44] == IORAM[0x45]) handleScanCoin();
} else {
}
IORAM[0x0F] &= 0xFD
}
IORAM[b] = a;
}
IOWriteFunctions[0x44] = function(a, b){
console.log("writing to LCDY??? what are you even doing")
//IORAM[b] = 0;
}
IOWriteFunctions[0x45] = function(a, b){
if ((IORAM[b] != a) && (IORAM[0x40]&0x80)) {
if (IORAM[0x44] == a) handleScanCoin();
}
IORAM[b] = a;
}
IOWriteFunctions[0x41] = function(a, b){
IORAM[b] = (IORAM[b]&0x7)|(a&0x78)
}
IOReadFunctions[0x41] = function(a){
return (IORAM[a] & 0xFC) | (IORAM[0x40]&0x80)?LCDstate:0;
}
//CGB IO
IOWriteFunctions[0x4D] = function(a, b){
IORAM[b] = a;
};
IOReadFunctions[0x4D] = function(a) {
if (CGB) { return (IORAM[a]&1)|((CPUSpeed==2)?0x80:0) }
else return IORAM[a]
}
/* CGB DMA positions */
IOWriteFunctions[0x51] = function(a) {
CGBDMA.srcPos = ((a<<8)|(CGBDMA.srcPos&0xFF))&0xFFF0
}
IOWriteFunctions[0x52] = function(a) {
CGBDMA.srcPos = ((a)|(CGBDMA.srcPos&0xFF00))&0xFFF0
}
IOWriteFunctions[0x53] = function(a) {
CGBDMA.destPos = ((a<<8)|(CGBDMA.destPos&0xFF))&0x1FF0
}
IOWriteFunctions[0x54] = function(a) {
CGBDMA.destPos = ((a)|(CGBDMA.destPos&0xFF00))&0x1FF0
}
IOReadFunctions[0x51] = function(a) {
return CGBDMA.srcPos>>8;
}
IOReadFunctions[0x52] = function(a) {
return CGBDMA.srcPos&0xFF;
}
IOReadFunctions[0x53] = function(a) {
return CGBDMA.destPos>>8;
}
IOReadFunctions[0x54] = function(a) {
return CGBDMA.destPos&0xFF;
}
IOWriteFunctions[0x55] = function(a, b){ //VRAM DMA
if (CGB) {
if (CGBDMA.active && CGBDMA.mode && (!(a&0x80))) {
CGBDMA.active = false;
return;
}
CGBDMA.active = true;
//CGBDMA.srcPos = (IORAM[0x52]+(IORAM[0x51]<<8))&0xFFF0
//CGBDMA.destPos = (IORAM[0x54]+(IORAM[0x53]<<8))&0x1FF0
CGBDMA.mode = a&0x80;
CGBDMA.Tlength = ((a&0x7F)+1)<<4;
IORAM[b] = a;
} else {
IORAM[b] = a;
}
};
IOReadFunctions[0x55] = function(a) {
if (CGB) {
if (CGBDMA.active) return ((CGBDMA.Tlength>>4)-1)|0x80;
else return 0;
} else {
return IORAM[a];
}
}
IOWriteFunctions[0x4F] = function(a, b){
if (CGB) {
IORAM[b] = (a&1);
} else {
IORAM[b] = a;
}
}
IOWriteFunctions[0x70] = function(a, b){
if (CGB) {
if ((a&7)==0) IORAM[b] = 1;
else IORAM[b] = (a&7);
} else {
IORAM[b] = a;
}
}
IOReadFunctions[0x69] = function(a){
if (CGB) return CGBBGPalReg[IORAM[0x68]&0x3F]
else return IORAM[a];
}
IOWriteFunctions[0x69] = function(a, b){
if (CGB) {
var palette = IORAM[0x68]&0x3F
CGBBGPalReg[palette] = a;
var colNum = Math.floor(palette/2)
var mult = 8.225806451612904;
CGBBGPal.set([Math.round((CGBBGPalReg[colNum*2]&0x1F)*mult), Math.round(((CGBBGPalReg[colNum*2]>>5)+((CGBBGPalReg[colNum*2+1]&3)<<3))*mult), Math.round(((CGBBGPalReg[colNum*2+1]&0x7C)>>2)*mult), 255], colNum*4);
if (IORAM[0x68]&0x80) {
IORAM[0x68] = ((IORAM[0x68]+1)&0x3F)|0x80
}
} else {
IORAM[b] = a;
}
}
IOReadFunctions[0x6B] = function(a){
if (CGB) return CGBSprPalReg[IORAM[0x6A]&0x3F]
else return IORAM[a];
}
IOWriteFunctions[0x6B] = function(a, b){
if (CGB) {
var palette = IORAM[0x6A]&0x3F
CGBSprPalReg[palette] = a;
var colNum = Math.floor(palette/2)
var mult = 8.225806451612904;
CGBSprPal.set([Math.round((CGBSprPalReg[colNum*2]&0x1F)*mult), Math.round(((CGBSprPalReg[colNum*2]>>5)+((CGBSprPalReg[colNum*2+1]&3)<<3))*mult), Math.round(((CGBSprPalReg[colNum*2+1]&0x7C)>>2)*mult), 255], colNum*4)
if (IORAM[0x6A]&0x80) {
IORAM[0x6A] = ((IORAM[0x6A]+1)&0x3F)|0x80
}
} else {
IORAM[b] = a;
}
}
//END CGB IO
IOWriteFunctions[0x50] = function(a, b){
biosActive = false;
IORAM[b] = a;
};
IOWriteFunctions[0x46] = function(a, b){
DMATransfer(a);
};
IOWriteFunctions[0] = function(a, b){
a = 255 - a
if(a&0x10) {
IORAM[0] = buttonByte&0xF;
} else if(a&0x20) {
IORAM[0] = buttonByte>>4;
}
};
IOWriteFunctions[0x10] = function(a, b) { if (IORAM[0x26]&0x80) { IORAM[b] = a; } }
IOWriteFunctions[0x11] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
AudioEngine[0].duty = duties[a>>6]
} else {
if (CGB) return;
}
AudioEngine[0].lengthCtr = (64-(a&0x3F)); // can be written while off on DMG for whatever reason
}
IOWriteFunctions[0x12] = function(a, b) {
if (IORAM[0x26]&0x80) {
//ZOMBIE MODE
var attr = IORAM[esweepPtrs[0]];
if (IORAM[0x26]&(1<<0)) {
var period = attr&7
}
IORAM[b] = a;
if (!(a&0xF8)) channelOff(0); //DAC Power Off
soundPhase = 1;
}
}
IOWriteFunctions[0x13] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
setChannelFrequency(0);
}
}
IOWriteFunctions[0x14] = function(a, b) {
if (IORAM[0x26]&0x80) {
var enabledLength = (!(IORAM[0x14]&64) && (a&64))
if (enabledLength && ((soundPhase&1) == 1) && (AudioEngine[0].lengthCtr != 0)) {
if (--AudioEngine[0].lengthCtr == 0) {
channelOff(0);
}
}
IORAM[b] = a;
if ((a>>7) == 1) triggerChannel(0);
else setChannelFrequency(0);
}
}
IOWriteFunctions[0x15] = function(a, b) { if (IORAM[0x26]&0x80) { IORAM[b] = a; } }
IOWriteFunctions[0x16] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
AudioEngine[1].duty = duties[a>>6]
} else {
if (CGB) return;
}
AudioEngine[1].lengthCtr = (64-(a&0x3F));
}
IOWriteFunctions[0x17] = function(a, b) {
if (IORAM[0x26]&0x80) {
//ZOMBIE MODE
var attr = IORAM[esweepPtrs[1]];
if (IORAM[0x26]&(1<<1)) {
var period = attr&7
}
IORAM[b] = a;
if (!(a&0xF8)) channelOff(1); //DAC Power Off
}
}
IOWriteFunctions[0x18] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
setChannelFrequency(1);
}
}
IOWriteFunctions[0x19] = function(a, b) {
if (IORAM[0x26]&0x80) {
var enabledLength = (!(IORAM[0x19]&64) && (a&64));
if (enabledLength && ((soundPhase&1) == 1) && (AudioEngine[1].lengthCtr != 0)) {
if (--AudioEngine[1].lengthCtr == 0) {
channelOff(1);
}
}
IORAM[b] = a;
if ((a>>7) == 1) triggerChannel(1);
else setChannelFrequency(1);
}
}
IOWriteFunctions[0x1A] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
if (!(a&0x80)) channelOff(2);
}
}
IOWriteFunctions[0x1B] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
} else {
if (CGB) return;
}
AudioEngine[2].lengthCtr = (256-a);
}
IOWriteFunctions[0x1C] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
readAndUpdateVolume(2);
}
}
IOWriteFunctions[0x1D] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
setChannelFrequency(2);
}
}
IOWriteFunctions[0x1E] = function(a, b) {
if (IORAM[0x26]&0x80) {
var enabledLength = (!(IORAM[0x1E]&64) && (a&64));
if (enabledLength && ((soundPhase&1) == 1) && (AudioEngine[2].lengthCtr != 0)) {
if (--AudioEngine[2].lengthCtr == 0) {
channelOff(2);
}
}
IORAM[b] = a;
if ((a>>7) == 1) triggerChannel(2);
else setChannelFrequency(2);
}
}
IOWriteFunctions[0x1F] = function(a, b) { if (IORAM[0x26]&0x80) { IORAM[b] = a; } }
IOWriteFunctions[0x20] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
} else {
if (CGB) return;
}
AudioEngine[3].lengthCtr = (64-(a&0x3F));
}
IOWriteFunctions[0x21] = function(a, b) {
if (IORAM[0x26]&0x80) {
//ZOMBIE MODE
var attr = IORAM[esweepPtrs[3]];
if (IORAM[0x26]&(1<<3)) {
var period = attr&7
}
IORAM[b] = a;
if (!(a&0xF8)) channelOff(3); //DAC Power Off
}
}
IOWriteFunctions[0x22] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
updateNoiseFrequency();
}
}
IOWriteFunctions[0x23] = function(a, b) {
if (IORAM[0x26]&0x80) {
var enabledLength = (!(IORAM[0x23]&64) && (a&64));
if (enabledLength && ((soundPhase&1) == 1) && (AudioEngine[3].lengthCtr != 0)) {
if (--AudioEngine[3].lengthCtr == 0) {
channelOff(3);
}
}
IORAM[b] = a;
if ((a>>7) == 1) triggerChannel(3);
else updateNoiseFrequency();
}
}
IOWriteFunctions[0x24] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
soundMasterGain();
}
}
IOWriteFunctions[0x25] = function(a, b) {
if (IORAM[0x26]&0x80) {
IORAM[b] = a;
for (var i=0; i<4; i++) {
AudioEngine[i].lEnable = a&(1<<(i+4))
AudioEngine[i].rEnable = a&(1<<i)
}
//soundMasterGain();
}
}
IOWriteFunctions[0x26] = function(a, b) {
if ((IORAM[0x26]&0x80) && (!(a&0x80))) {
//power off!!!
for (var i=0; i<4; i++) channelOff(i);
for (var i=0x10; i<0x26; i++) {
if ((lengthPtrs.indexOf(i) == -1) || CGB) IOWriteFunctions[i](0, i);
}
IORAM[b] = 0;
} else if ((!(IORAM[0x26]&0x80)) && (a&0x80)) {
IORAM[b] = 0x80;
}
}
IOReadFunctions[0x10] = function(a) { return IORAM[a] | 0x80; }
IOReadFunctions[0x11] = function(a) { return IORAM[a] | 0x3F; }
IOReadFunctions[0x13] = function(a) { return IORAM[a] | 0xFF; }
IOReadFunctions[0x14] = function(a) { return IORAM[a] | 0xBF; }
IOReadFunctions[0x15] = function(a) { return IORAM[a] | 0xFF; }
IOReadFunctions[0x16] = function(a) { return IORAM[a] | 0x3F; }
IOReadFunctions[0x18] = function(a) { return IORAM[a] | 0xFF; }
IOReadFunctions[0x19] = function(a) { return IORAM[a] | 0xBF; }
IOReadFunctions[0x1A] = function(a) { return IORAM[a] | 0x7F; }
IOReadFunctions[0x1B] = function(a) { return IORAM[a] | 0xFF; }
IOReadFunctions[0x1C] = function(a) { return IORAM[a] | 0x9F; }
IOReadFunctions[0x1D] = function(a) { return IORAM[a] | 0xFF; }
IOReadFunctions[0x1E] = function(a) { return IORAM[a] | 0xBF; }
IOReadFunctions[0x1F] = function(a) { return IORAM[a] | 0xFF; }
IOReadFunctions[0x20] = function(a) { return IORAM[a] | 0xFF; }
IOReadFunctions[0x23] = function(a) { return IORAM[a] | 0xBF; }
IOReadFunctions[0x26] = function(a) { return IORAM[a] | 0x70; }
IOWriteFunctions[0x47] = function(a, b) {
IORAM[b] = a;
palettes.set(readDMGPalette(0), 0);
}
IOWriteFunctions[0x48] = function(a, b) {
IORAM[b] = a;
palettes.set(readDMGPalette(1), 16);
}
IOWriteFunctions[0x49] = function(a, b) {
IORAM[b] = a;
palettes.set(readDMGPalette(2), 32);
}
function calculateCurrentWaveRam() { //uses last phase and the cycle that phase was on to determine the real Wave RAM Position
var temp = (AudioEngine[2].phase + AudioEngine[2].frequency*(audioSampleRate/4194304)*(masterClock-WaveRAMCycles))%32
//console.log((masterClock-WaveRAMCycles)+ " " +(temp-AudioEngine[2].phase))
return Math.floor(temp/2);
}
function WaveRAMRead(a) {
if (!(IORAM[0x26]&4)) {
return IORAM[a]
} else if (true) { //DMG only, CGB is always accessable ---- masterClock-WaveRAMCycles <= 16 ---- currently disabled until accurate Wave RAM Read timings are achieved
return IORAM[0x30+calculateCurrentWaveRam()]
} else {
return 0xFF;
}
}
function WaveRAMWrite(a, b) {
if (!(IORAM[0x26]&4)) {
IORAM[b] = a;
} else if (true) { //DMG only, CGB is always accessable
console.log("illegal WRAM change!")
IORAM[0x30+(Math.floor(AudioEngine[2].phase/2))] = a
}
}
for (var i=0x27; i<=0x2F; i++) {
IOReadFunctions[i] = function(a) { return 0xFF; }
}
for (var i=0x30; i<=0x3F; i++) {
IOReadFunctions[i] = WaveRAMRead
IOWriteFunctions[i] = WaveRAMWrite
}
var IOWriteDefault = function(a, b) {
IORAM[b] = a;
}
var IOReadDefault = function(b) {
return IORAM[b];
}
function DMATransfer(a) {
var mempos = a<<8;