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jetski.js
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jetski.js
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var D = document;
var title_options = ['Eternal 3am', '3am Eternal', '3am Muumin', 'Justified Leather', '3am Justified', 'Ancient Jetski', 'Eternal Night', 'KLFtro', 'The Jams are back in town', 'Ancient ABBA'];
rand = function(n){
return 0|(Math.random()*n);
};
var title = title_options[rand(title_options.length)];
D.title = title;
PI = Math.PI;
si = Math.sin;
M = Math.max;
N = Math.min;
Q = Math.sqrt;
var b = D.body;
var Ms = b.style;
Ms.margin='0px';
var blackcolor = Ms.background = "#000";
Ms.overflow = 'hidden';
b.innerHTML = '';
var c = D.createElement('canvas');
b.appendChild(c);
c.style.background = "transparent";
var ctx = c.getContext('2d');
//
// hash canvas context functions larger then 6 characters
// based on a hack documented by cb and p01
// referenced in closure_ctxhash.js
//
//
//for(k in ctx)ctx[k[0]+[k[6]]]=ctx[k];
// not working properly anymore(maybe because of new closure version?)
//
var w = ctx.width = c.width = window.innerWidth;
var h = ctx.height = c.height = window.innerHeight;
var pattern = note = 0;
var noise = [];
var startTime = (new Date()).getTime();
//
// request animation frame, from random place on the internet
//
(function() {
var lastTime = 0;
var vendors = ['ms', 'moz', 'webkit', 'o'];
for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame']
|| window[vendors[x]+'CancelRequestAnimationFrame'];
}
if (!window.requestAnimationFrame)
window.requestAnimationFrame = function(callback, element) {
var currTime = new Date().getTime();
var timeToCall = M(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function() { callback(currTime + timeToCall); },
timeToCall);
lastTime = currTime + timeToCall;
return id;
};
if (!window.cancelAnimationFrame)
window.cancelAnimationFrame = function(id) {
clearTimeout(id);
};
}());
//
// ahx replayer, slightly adapted from ahx.js of Cruisin' / Abyss
// hacked for size, some effects werent being used by the song so they were commented
//
// patched in 2015 to only use AudioContext() instead of deprecated functions in Firefox and webkit
//
function AHXMaster() {
if(typeof(AudioContext) != 'undefined')
return new AHXMasterAudioContext();
else
return new AHXMasterNull();
}
AHXSong = function() {};
AHXSong.prototype = {
Name: '',
Restart: 0,
PositionNr: 0,
TrackLength: 0,
TrackNr: 0,
InstrumentNr: 0,
SubsongNr: 0,
Revision: 0,
SpeedMultiplier: 0,
Positions: [],
Tracks: [],
Instruments: [],
Subsongs: [],
LoadSong: function(url, completionHandler) {
var Song = this;
var binString = new dataType();
binString.data = url;
Song.InitSong(binString);
completionHandler();
},
InitSong: function(stream) { // stream = dataType()
stream.pos = 3;
this.Revision = stream.readByte();
//var streamreadByte = stream.readByteAt;
//this replace lowers closure but increases png :S
var SBPtr = 14;
// Header ////////////////////////////////////////////
// Songname
var NamePtr = stream.readShort();
this.Name = stream.readStringAt(NamePtr);
NamePtr += this.Name.length + 1;
this.SpeedMultiplier = ((stream.readByteAt(6)>>5)&3)+1;
this.PositionNr = ((stream.readByteAt(6)&0xf)<<8) | stream.readByteAt(7);
this.Restart = (stream.readByteAt(8)<<8) | stream.readByteAt(9);
this.TrackLength = stream.readByteAt(10);
this.TrackNr = stream.readByteAt(11);
this.InstrumentNr = stream.readByteAt(12);
this.SubsongNr = stream.readByteAt(13);
// Subsongs //////////////////////////////////////////
for(var i = 0; i < this.SubsongNr; i++) {
this.Subsongs.push((stream.readByteAt(SBPtr+0)<<8)|stream.readByteAt(SBPtr+1));
SBPtr += 2;
}
// Position List /////////////////////////////////////
for(var i = 0; i < this.PositionNr; i++) {
var Pos = AHXPosition();
for(var j = 0; j < 4; j++) {
Pos.Track.push(stream.readByteAt(SBPtr++));
var Transpose = stream.readByteAt(SBPtr++);
if(Transpose & 0x80) Transpose = (Transpose & 0x7f) - 0x80; // signed char
Pos.Transpose.push(Transpose);
}
this.Positions.push(Pos);
}
// Tracks ////////////////////////////////////////////
var MaxTrack = this.TrackNr;
//Song.Tracks = new AHXStep*[MaxTrack+1];
for(var i = 0; i < MaxTrack+1; i++) {
var Track = [];
if((stream.readByteAt(6)&0x80)==0x80 && i==0) { // empty track
for(var j = 0; j < this.TrackLength; j++)
Track.push(AHXStep());
} else {
for(var j = 0; j < this.TrackLength; j++) {
var Step = AHXStep();
Step.Note = (stream.readByteAt(SBPtr)>>2)&0x3f;
Step.Instrument = ((stream.readByteAt(SBPtr)&0x3)<<4) | (stream.readByteAt(SBPtr+1)>>4);
Step.FX = stream.readByteAt(SBPtr+1)&0xf;
Step.FXParam = stream.readByteAt(SBPtr+2);
Track.push(Step);
SBPtr += 3;
}
}
this.Tracks.push(Track);
}
// Instruments ///////////////////////////////////////
//Song.Instruments = new AHXInstrument[Song.InstrumentNr+1];
this.Instruments.push(AHXInstrument()); // empty instrument 0
for(var i = 1; i < this.InstrumentNr+1; i++) {
var Instrument = AHXInstrument();
Instrument.Name = stream.readStringAt(NamePtr);
NamePtr += Instrument.Name.length + 1;
Instrument.Volume = stream.readByteAt(SBPtr+0);
Instrument.FilterSpeed = ((stream.readByteAt(SBPtr+1)>>3)&0x1f) | ((stream.readByteAt(SBPtr+12)>>2)&0x20);
Instrument.WaveLength = stream.readByteAt(SBPtr+1)&0x7;
Instrument.Envelope.aFrames = stream.readByteAt(SBPtr+2);
Instrument.Envelope.aVolume = stream.readByteAt(SBPtr+3);
Instrument.Envelope.dFrames = stream.readByteAt(SBPtr+4); //4
Instrument.Envelope.dVolume = stream.readByteAt(SBPtr+5);
Instrument.Envelope.sFrames = stream.readByteAt(SBPtr+6);
Instrument.Envelope.rFrames = stream.readByteAt(SBPtr+7); //7
Instrument.Envelope.rVolume = stream.readByteAt(SBPtr+8);
Instrument.FilterLowerLimit = stream.readByteAt(SBPtr+12)&0x7f;
Instrument.VibratoDelay = stream.readByteAt(SBPtr+13); //13
Instrument.HardCutReleaseFrames = (stream.readByteAt(SBPtr+14)>>4)&7;
Instrument.HardCutRelease = stream.readByteAt(SBPtr+14)&0x80?1:0;
Instrument.VibratoDepth = stream.readByteAt(SBPtr+14)&0xf; //14
Instrument.VibratoSpeed = stream.readByteAt(SBPtr+15);
Instrument.SquareLowerLimit = stream.readByteAt(SBPtr+16);
Instrument.SquareUpperLimit = stream.readByteAt(SBPtr+17); //17
Instrument.SquareSpeed = stream.readByteAt(SBPtr+18);
Instrument.FilterUpperLimit = stream.readByteAt(SBPtr+19)&0x3f; //19
Instrument.PList.Speed = stream.readByteAt(SBPtr+20);
Instrument.PList.Length= stream.readByteAt(SBPtr+21);
SBPtr += 22;
//Instrument.PList.Entries=new AHXPListEntry[Instrument.PList.Length);
for(var j = 0; j < Instrument.PList.Length; j++) {
var Entry = AHXPlistEntry();
Entry.FX[0] = (stream.readByteAt(SBPtr+0)>>2)&7;
Entry.FX[1] = (stream.readByteAt(SBPtr+0)>>5)&7;
Entry.Waveform = ((stream.readByteAt(SBPtr+0)<<1)&6) | (stream.readByteAt(SBPtr+1)>>7);
Entry.Fixed = (stream.readByteAt(SBPtr+1)>>6)&1;
Entry.Note = stream.readByteAt(SBPtr+1)&0x3f;
Entry.FXParam[0] = stream.readByteAt(SBPtr+2);
Entry.FXParam[1] = stream.readByteAt(SBPtr+3);
Instrument.PList.Entries.push(Entry);
SBPtr += 4;
}
this.Instruments.push(Instrument);
}
}
}
function AHXPosition() {
return {
Track: [],
Transpose: []
}
}
function AHXStep() {
return {
Note: 0,
Instrument: 0,
FX: 0,
FXParam: 0
}
}
function AHXPlistEntry() {
return {
Note: 0,
Fixed: 0,
Waveform: 0,
FX: [0, 0],
FXParam: [0, 0]
}
}
function AHXPList() {
return {
Speed: 0,
Length: 0,
Entries: []
}
}
function AHXEnvelope() {
return {
aFrames: 0, aVolume: 0,
dFrames: 0, dVolume: 0,
sFrames: 0,
rFrames: 0, rVolume: 0
}
}
function AHXInstrument() {
return {
Name: '',
Volume: 0,
WaveLength: 0,
Envelope: AHXEnvelope(),
FilterLowerLimit: 0, FilterUpperLimit: 0, FilterSpeed: 0,
SquareLowerLimit: 0, SquareUpperLimit: 0, SquareSpeed: 0,
VibratoDelay: 0, VibratoDepth: 0, VibratoSpeed: 0,
HardCutRelease: 0, HardCutReleaseFrames: 0,
PList: AHXPList()
}
}
function AHXVoice() {
return {
// Read those variables for mixing!
VoiceVolume: 0, VoicePeriod: 0,
VoiceBuffer: [], //char VoiceBuffer[0x281]; // for oversampling optimization!
Track: 0, Transpose: 0,
NextTrack: 0, NextTranspose: 0,
ADSRVolume: 0, // fixed point 8:8
ADSR: AHXEnvelope(), // frames/delta fixed 8:8
Instrument: null, // current instrument
InstrPeriod: 0, TrackPeriod: 0, VibratoPeriod: 0,
NoteMaxVolume: 0, PerfSubVolume: 0, TrackMasterVolume: 0x40,
NewWaveform: 0, Waveform: 0, PlantSquare: 0, PlantPeriod: 0, IgnoreSquare: 0,
TrackOn: 1, FixedNote: 0,
VolumeSlideUp: 0, VolumeSlideDown: 0,
HardCut: 0, HardCutRelease: 0, HardCutReleaseF: 0,
PeriodSlideSpeed: 0, PeriodSlidePeriod: 0, PeriodSlideLimit: 0, PeriodSlideOn: 0, PeriodSlideWithLimit: 0,
PeriodPerfSlideSpeed: 0, PeriodPerfSlidePeriod: 0, PeriodPerfSlideOn: 0,
VibratoDelay: 0, VibratoCurrent: 0, VibratoDepth: 0, VibratoSpeed: 0,
SquareOn: 0, SquareInit: 0, SquareWait: 0, SquareLowerLimit: 0, SquareUpperLimit: 0, SquarePos: 0, SquareSign: 0, SquareSlidingIn: 0, SquareReverse: 0,
FilterOn: 0, FilterInit: 0, FilterWait: 0, FilterLowerLimit: 0, FilterUpperLimit: 0, FilterPos: 0, FilterSign: 0, FilterSpeed: 0, FilterSlidingIn: 0, IgnoreFilter: 0,
PerfCurrent: 0, PerfSpeed: 0, PerfWait: 0,
WaveLength: 0,
PerfList: null,
NoteDelayWait: 0, NoteDelayOn: 0, NoteCutWait: 0, NoteCutOn: 0,
AudioSource: [],
//char* AudioSource,
AudioPeriod: 0, AudioVolume: 0,
//SquareTempBuffer: new Array(0x80), //char SquareTempBuffer[0x80]: 0,
CalcADSR: function() {
var tA = this.ADSR;
var tiE = this.Instrument.Envelope;
tA.aFrames = tiE.aFrames;
tA.aVolume = tiE.aVolume*256/tA.aFrames;
tA.dFrames = tiE.dFrames;
tA.dVolume = (tiE.dVolume-tiE.aVolume)*256/tA.dFrames;
tA.sFrames = tiE.sFrames;
tA.rFrames = tiE.rFrames;
tA.rVolume = (tiE.rVolume-tiE.dVolume)*256/tA.rFrames;
}
}
}
function AHXWaves() {
this.GenerateTriangle = function(Len) {
var Buffer = [];
var d2 = Len;
var d5 = d2 >> 2;
var d1 = 128/d5;
var d4 = -(d2 >> 1);
var eax = 0;
for(var ecx = 0; ecx < d5; ecx++) {
Buffer.push(eax);
eax += d1;
}
Buffer.push(0x7f);
if(d5 != 1) {
eax = 128;
for(var ecx = 0; ecx < d5-1; ecx++) {
eax -= d1;
Buffer.push(eax);
}
}
var esi = Buffer.length + d4;
for(var ecx = 0; ecx < d5*2; ecx++) {
var neu = Buffer[esi++]
if(neu == 0x7f)
neu = -0x80;
else
neu = -neu;
Buffer.push(neu);
}
return Buffer;
}
this.GenerateSquare = function() {
var Buffer = [];
for(var ebx = 1; ebx <= 0x20; ebx++) {
for(var ecx = 0; ecx < (0x40-ebx)*2; ecx++) Buffer.push(-0x80);
for(var ecx = 0; ecx < ebx *2; ecx++) Buffer.push(0x7f);
}
return Buffer;
}
this.GenerateSawtooth = function(Len) {
var Buffer = [];
var ebx = 0|(256/(Len-1)), eax = -128;
for(var ecx = 0; ecx < Len; ecx++) {
Buffer.push(eax);
eax += ebx;
}
return Buffer;
}
/*
this.GenerateWhiteNoise = function(Len) {
//
// bartMan says this is the original code, but i suck at opcode porting
// so based on analysing the noise table i hacked an estimated function instead
// but left this code commented here for reference
//
// void AHXWaves::GenerateWhiteNoise(char* Buffer, int Len)
// {
// __asm {
// mov edi, Buffer
// mov ecx, Len
// mov eax, 0x41595321 // AYS!
// loop0: test eax, 0x100
// je lower
// cmp ax, 0
// jl mi
// mov byte ptr [edi], 0x7f
// jmp weida
// mi: mov byte ptr [edi], 0x80
// jmp weida
// lower: mov byte ptr [edi], al
// weida: inc edi
// ror eax, 5
// xor al, 10011010b
// mov bx, ax
// rol eax, 2
// add bx, ax
// xor ax, bx
// ror eax, 3
// dec ecx
// jnz loop0
// }
// }
var noise = [];
var size = Len;
var eax = 0x41595321;
var al = bx = ax = 0;
for(var edi = size-1; edi>0; edi--)
{
if (eax == 0x100) {
noise[edi] = al;
} else {
if (ax < 0) {
noise[edi] = 0x80;
} else {
noise[edi] = 0x7f;
}
}
eax = eax >>> 5; //this should be ror eax, 5...
al ^= (2+8+16+128);
bx = ax;
var shift = 2 & 31;
if(shift) {
var maskLeft = 1 << (32 - shift);
var thisShiftLeft = eax & ~maskLeft;
var shiftedLeft = (thisShiftLeft) << shift;
var rightStuff = eax >>> (32 - shift);
eax = shiftedLeft | rightStuff;
}
bx += ax;
ax ^= bx;
eax = eax >>> 3; //this should be ror eax, 3...
}
return noise;
}*/
//
// estimated function hack, not accurate to original
//
this.GenerateWhiteNoise = function(Len) {
//var noise = [];
var size = Len;
for(var i = 0; i<Len; i++)
{
noise[i] = rand(255);
if (rand(10) < 6) noise[i] = 0x80 - rand(2);
}
return noise;
}
this.Filter = function(input, fre, lowOrHigh) { // 0 = low, 1 = high
var high, mid = .0, low = .0;
var output = [];
for(var i = 0; i < input.length; i++) {
high = input[i] - mid - low; high = N(127.0, M(-128.0, high));
mid += high*fre; mid = N(127.0, M(-128.0, mid));
low += mid*fre; low = N(127.0, M(-128.0, low));
}
for(var i = 0; i < input.length; i++) {
high = input[i] - mid - low; high = N(127.0, M(-128.0, high));
mid += high*fre; mid = N(127.0, M(-128.0, mid));
low += mid*fre; low = N(127.0, M(-128.0, low));
if(lowOrHigh)
output.push(0|(high));
else
output.push(0|(low));
}
return output;
}
this.GenerateFilterWaveforms = function() {
var src = this.FilterSets[31];
var tfs = this.Filter;
var freq = 8;
var temp = 0;
while(temp < 31) {
var dstLow = {};
dstLow.Sawtooth = [];
dstLow.Triangle = [];
var dstHigh = {};
dstHigh.Sawtooth = [];
dstHigh.Triangle = [];
var fre = freq * 1.25 / 100.0;
for (var i=0; i<=5; i++) {
dstLow.Sawtooth[i] = tfs(src.Sawtooth[i], fre, 0);
dstLow.Triangle[i] = tfs(src.Triangle[i], fre, 0);
dstHigh.Sawtooth[i] = tfs(src.Sawtooth[i], fre, 1);
dstHigh.Triangle[i] = tfs(src.Triangle[i], fre, 1);
}
dstLow.Squares = [];
dstHigh.Squares = [];
// squares alle einzeln filtern
for(var i = 0; i < 0x20; i++) {
dstLow.Squares = dstLow.Squares.concat(this.Filter(src.Squares.slice(i*0x80, (i+1)*0x80), fre, 0));
dstHigh.Squares = dstHigh.Squares.concat(this.Filter(src.Squares.slice(i*0x80, (i+1)*0x80), fre, 1));
}
dstLow.WhiteNoiseBig = this.Filter(src.WhiteNoiseBig, fre, 0);
dstHigh.WhiteNoiseBig = this.Filter(src.WhiteNoiseBig, fre, 1);
this.FilterSets[temp] = dstLow;
this.FilterSets[temp+32] = dstHigh;
temp++;
freq += 3;
}
}
this.FilterSets = new Array(31+1+31);
this.FilterSets[31] = {};
this.FilterSets[31].Sawtooth = [];
this.FilterSets[31].Sawtooth[0] = this.GenerateSawtooth(0x04);
this.FilterSets[31].Sawtooth[1] = this.GenerateSawtooth(0x08);
this.FilterSets[31].Sawtooth[2] = this.GenerateSawtooth(0x10);
this.FilterSets[31].Sawtooth[3] = this.GenerateSawtooth(0x20);
this.FilterSets[31].Sawtooth[4] = this.GenerateSawtooth(0x40);
this.FilterSets[31].Sawtooth[5] = this.GenerateSawtooth(0x80);
this.FilterSets[31].Triangle = [];
this.FilterSets[31].Triangle[0] = this.GenerateTriangle(0x04);
this.FilterSets[31].Triangle[1] = this.GenerateTriangle(0x08);
this.FilterSets[31].Triangle[2] = this.GenerateTriangle(0x10);
this.FilterSets[31].Triangle[3] = this.GenerateTriangle(0x20);
this.FilterSets[31].Triangle[4] = this.GenerateTriangle(0x40);
this.FilterSets[31].Triangle[5] = this.GenerateTriangle(0x80);
this.FilterSets[31].Squares = this.GenerateSquare();
this.FilterSets[31].WhiteNoiseBig = this.GenerateWhiteNoise(0x280*3);
this.GenerateFilterWaveforms();
return this;
}
function AHXPlayer(waves) {
return {
StepWaitFrames: 0, GetNewPosition: 0, SongEndReached: 0, TimingValue: 0,
PatternBreak: 0,
MainVolume: 0,
Playing: 0, Tempo: 0,
PosNr: 0, PosJump: 0,
NoteNr: 0, PosJumpNote: 0,
WaveformTab: [], //char* WaveformTab[4];
Waves: waves || new AHXWaves(),
Voices: [],
WNRandom: 0,
Song: AHXSong(),
PlayingTime: 0,
//
// hacked the functions calling VibratoTable to calculate the mirrored values instead of using the lookup
//
VibratoTable: [
0,24,49,74,97,120,141,161,180,197,212,224,235,244,250,253,255,
253,250,244,235,224,212,197,180,161,141,120,97,74,49,24
// ,0,-24,-49,-74,-97,-120,-141,-161,-180,-197,-212,-224,-235,-244,-250,-253,-255,
// -253,-250,-244,-235,-224,-212,-197,-180,-161,-141,-120,-97,-74,-49,-24
],
PeriodTable: [
0x0000, 0x0D60, 0x0CA0, 0x0BE8, 0x0B40, 0x0A98, 0x0A00, 0x0970,
0x08E8, 0x0868, 0x07F0, 0x0780, 0x0714, 0x06B0, 0x0650, 0x05F4,
0x05A0, 0x054C, 0x0500, 0x04B8, 0x0474, 0x0434, 0x03F8, 0x03C0,
0x038A, 0x0358, 0x0328, 0x02FA, 0x02D0, 0x02A6, 0x0280, 0x025C,
0x023A, 0x021A, 0x01FC, 0x01E0, 0x01C5, 0x01AC, 0x0194, 0x017D,
0x0168, 0x0153, 0x0140, 0x012E, 0x011D, 0x010D, 0x00FE, 0x00F0,
0x00E2, 0x00D6, 0x00CA, 0x00BE, 0x00B4, 0x00AA, 0x00A0, 0x0097,
0x008F, 0x0087, 0x007F, 0x0078, 0x0071
],
InitSong: function(song) { // song: AHXSong()
this.Song = song;
},
InitSubsong: function(Nr) {
if(Nr > this.Song.SubsongNr) return 0;
if(Nr == 0) this.PosNr = 0;
else this.PosNr = Song.Subsongs[Nr-1];
this.PosJump = 0;
this.PatternBreak = 0;
this.MainVolume = 0x40;
this.Playing = 1;
this.NoteNr = this.PosJumpNote = 0;
this.Tempo = 6;
this.StepWaitFrames = 0;
this.GetNewPosition = 1;
this.SongEndReached = 0;
this.TimingValue = this.PlayingTime = 0;
this.Voices = [ AHXVoice(), AHXVoice(), AHXVoice(), AHXVoice() ];
return 1;
},
PlayIRQ: function() {
if(this.StepWaitFrames <= 0) {
if(this.GetNewPosition) {
var NextPos = (this.PosNr+1==this.Song.PositionNr)?0:(this.PosNr+1);
for(var i = 0; i < 4; i++) {
this.Voices[i].Track = this.Song.Positions[this.PosNr].Track[i];
this.Voices[i].Transpose = this.Song.Positions[this.PosNr].Transpose[i];
this.Voices[i].NextTrack = this.Song.Positions[NextPos].Track[i];
this.Voices[i].NextTranspose = this.Song.Positions[NextPos].Transpose[i];
}
//console.log("pattern:" + NextPos);
pattern = NextPos;
this.GetNewPosition = 0;
}
for(var i = 0; i < 4; i++) this.ProcessStep(i);
this.StepWaitFrames = this.Tempo;
}
//DoFrameStuff
for(var i = 0; i < 4; i++) this.ProcessFrame(i);
this.PlayingTime++;
if(this.Tempo > 0 && --this.StepWaitFrames <= 0) {
if(!this.PatternBreak) {
this.NoteNr++;
if(this.NoteNr >= this.Song.TrackLength) {
this.PosJump = this.PosNr+1;
this.PosJumpNote = 0;
this.PatternBreak = 1;
}
}
if(this.PatternBreak) {
this.PatternBreak = 0;
this.NoteNr = this.PosJumpNote;
this.PosJumpNote = 0;
this.PosNr = this.PosJump;
this.PosJump = 0;
if(this.PosNr == this.Song.PositionNr) {
this.SongEndReached = 1;
this.PosNr = this.Song.Restart;
}
this.GetNewPosition = 1;
}
//console.log("note:" + this.NoteNr);
note = this.NoteNr;
}
//RemainPosition
for(var a = 0; a < 4; a++) this.SetAudio(a);
},
NextPosition: function() {
this.PosNr++;
if(this.PosNr == this.Song.PositionNr) this.PosNr = 0;
this.StepWaitFrames = 0;
this.GetNewPosition = 1;
},
PrevPosition: function() {
this.PosNr--;
if(this.PosNr < 0) this.PosNr = 0;
this.StepWaitFrames = 0;
this.GetNewPosition = 1;
},
JumpPosition: function(pos) {
this.PosNr = pos;
this.StepWaitFrames = 0;
this.GetNewPosition = 1;
},
ProcessStep: function(v) {
var tV = this.Voices[v];
if(!tV.TrackOn) return;
//console.log("note: " + this.NoteNr);
//note = this.NoteNr;
tV.VolumeSlideUp = tV.VolumeSlideDown = 0;
var Note = this.Song.Tracks[this.Song.Positions[this.PosNr].Track[v]][this.NoteNr].Note;
var Instrument = this.Song.Tracks[this.Song.Positions[this.PosNr].Track[v]][this.NoteNr].Instrument;
var FX = this.Song.Tracks[this.Song.Positions[this.PosNr].Track[v]][this.NoteNr].FX;
var FXParam = this.Song.Tracks[this.Song.Positions[this.PosNr].Track[v]][this.NoteNr].FXParam;
switch(FX) {
case 0x0: // Position Jump HI
if((FXParam & 0xf) > 0 && (FXParam & 0xf) <= 9)
this.PosJump = FXParam & 0xf;
break;
case 0x5: // Volume Slide + Tone Portamento
case 0xa: // Volume Slide
tV.VolumeSlideDown = FXParam & 0x0f;
tV.VolumeSlideUp = FXParam >> 4;
break;
case 0xb: // Position Jump
this.PosJump = this.PosJump*100 + (FXParam & 0x0f) + (FXParam >> 4)*10;
this.PatternBreak = 1;
break;
case 0xd: // Patternbreak
this.PosJump = this.PosNr + 1;
this.PosJumpNote = (FXParam & 0x0f) + (FXParam >> 4)*10;
if(this.PosJumpNote > this.Song.TrackLength) this.PosJumpNote = 0;
this.PatternBreak = 1;
break;
case 0xe: // Enhanced commands
switch(FXParam >> 4) {
case 0xc: // Note Cut
if((FXParam & 0x0f) < this.Tempo) {
tV.NoteCutWait = FXParam & 0x0f;
if(tV.NoteCutWait) {
tV.NoteCutOn = 1;
tV.HardCutRelease = 0;
}
}
break;
case 0xd: // Note Delay
if(tV.NoteDelayOn) {
tV.NoteDelayOn = 0;
} else {
if((FXParam & 0x0f) < this.Tempo) {
tV.NoteDelayWait = FXParam & 0x0f;
if(tV.NoteDelayWait) {
tV.NoteDelayOn = 1;
return;
}
}
}
break;
}
break;
case 0xf: // Speed
this.Tempo = FXParam;
break;
}
if(Instrument) {
tV.PerfSubVolume = 0x40;
tV.PeriodSlideSpeed = tV.PeriodSlidePeriod = tV.PeriodSlideLimit = 0;
tV.ADSRVolume = 0;
tV.Instrument = this.Song.Instruments[Instrument];
tV.CalcADSR();
//InitOnInstrument
tV.WaveLength = tV.Instrument.WaveLength;
tV.NoteMaxVolume = tV.Instrument.Volume;
//InitVibrato
tV.VibratoCurrent = 0;
tV.VibratoDelay = tV.Instrument.VibratoDelay;
tV.VibratoDepth = tV.Instrument.VibratoDepth;
tV.VibratoSpeed = tV.Instrument.VibratoSpeed;
tV.VibratoPeriod = 0;
//InitHardCut
tV.HardCutRelease = tV.Instrument.HardCutRelease;
tV.HardCut = tV.Instrument.HardCutReleaseFrames;
//InitSquare
tV.IgnoreSquare = tV.SquareSlidingIn = 0;
tV.SquareWait = tV.SquareOn = 0;
var SquareLower = tV.Instrument.SquareLowerLimit >> (5-tV.WaveLength);
var SquareUpper = tV.Instrument.SquareUpperLimit >> (5-tV.WaveLength);
if(SquareUpper < SquareLower) { var t = SquareUpper; SquareUpper = SquareLower; SquareLower = t; }
tV.SquareUpperLimit = SquareUpper;
tV.SquareLowerLimit = SquareLower;
//InitFilter
tV.IgnoreFilter = tV.FilterWait = tV.FilterOn = 0;
tV.FilterSlidingIn = 0;
var d6 = tV.Instrument.FilterSpeed;
var d3 = tV.Instrument.FilterLowerLimit;
var d4 = tV.Instrument.FilterUpperLimit;
if(d3 & 0x80) d6 |= 0x20;
if(d4 & 0x80) d6 |= 0x40;
tV.FilterSpeed = d6;
d3 &= ~0x80;
d4 &= ~0x80;
if(d3 > d4) { var t = d3; d3 = d4; d4 = t; }
tV.FilterUpperLimit = d4;
tV.FilterLowerLimit = d3;
tV.FilterPos = 32;
//Init PerfList
tV.PerfWait = tV.PerfCurrent = 0;
tV.PerfSpeed = tV.Instrument.PList.Speed;
tV.PerfList = tV.Instrument.PList;
}
//NoInstrument
tV.PeriodSlideOn = 0;
switch(FX) {
case 0x4: // Override filter
break;
case 0x9: // Set Squarewave-Offset
tV.SquarePos = FXParam >> (5 - tV.WaveLength);
tV.PlantSquare = 1;
tV.IgnoreSquare = 1;
break;
case 0x5: // Tone Portamento + Volume Slide
case 0x3: // Tone Portamento (Period Slide Up/Down w/ Limit)
if(FXParam != 0) tV.PeriodSlideSpeed = FXParam;
if(Note) {
var Neue = this.PeriodTable[Note];
var Alte = this.PeriodTable[tV.TrackPeriod];
Alte -= Neue;
Neue = Alte + tV.PeriodSlidePeriod;
if(Neue) tV.PeriodSlideLimit = -Alte;
}
tV.PeriodSlideOn = 1;
tV.PeriodSlideWithLimit = 1;
Note = 0;
}
// Note anschlagen
if(Note) {
tV.TrackPeriod = Note;
tV.PlantPeriod = 1;
}
switch(FX) {
case 0x1: // Portamento up (Period slide down)
tV.PeriodSlideSpeed = -FXParam;
tV.PeriodSlideOn = 1;
tV.PeriodSlideWithLimit = 0;
break;
case 0x2: // Portamento down (Period slide up)
tV.PeriodSlideSpeed = FXParam;
tV.PeriodSlideOn = 1;
tV.PeriodSlideWithLimit = 0;
break;
case 0xc: // Volume
if(FXParam <= 0x40)
tV.NoteMaxVolume = FXParam;
else {
FXParam -= 0x50;
if(FXParam <= 0x40)
for(var i = 0; i < 4; i++) this.Voices[i].TrackMasterVolume = FXParam;
else {
FXParam -= 0xa0 - 0x50;
if(FXParam <= 0x40)
tV.TrackMasterVolume = FXParam;
}
}
break;
case 0xe: // Enhanced commands
switch(FXParam >> 4) {
case 0x1: // Fineslide up (Period fineslide down)
tV.PeriodSlidePeriod = -(FXParam & 0x0f);
tV.PlantPeriod = 1;
break;
case 0x2: // Fineslide down (Period fineslide up)
tV.PeriodSlidePeriod = FXParam & 0x0f;
tV.PlantPeriod = 1;
break;
case 0x4: // Vibrato control
tV.VibratoDepth = FXParam & 0x0f;
break;
case 0xa: // Finevolume up
tV.NoteMaxVolume += FXParam & 0x0f;
if(tV.NoteMaxVolume > 0x40) tV.NoteMaxVolume = 0x40;
break;
case 0xb: // Finevolume down
tV.NoteMaxVolume -= FXParam & 0x0f;
if(tV.NoteMaxVolume < 0) tV.NoteMaxVolume = 0;
break;
}
break;
}
}, // ProcessStep
ProcessFrame: function(v) {
var tV = this.Voices[v];
if(!tV.TrackOn) return;
if(tV.NoteDelayOn) {
if(tV.NoteDelayWait <= 0)
this.ProcessStep(v);
else
tV.NoteDelayWait--;
}
if(tV.HardCut) {
var NextInstrument;
if(this.NoteNr+1 < this.Song.TrackLength)
NextInstrument = this.Song.Tracks[tV.Track][this.NoteNr+1].Instrument;
else
NextInstrument = this.Song.Tracks[tV.NextTrack][0].Instrument;
if(NextInstrument) {
var d1 = this.Tempo - tV.HardCut;
if(d1 < 0) d1 = 0;
if(!tV.NoteCutOn) {
tV.NoteCutOn = 1;
tV.NoteCutWait = d1;
tV.HardCutReleaseF = -(d1 - this.Tempo);
} else
tV.HardCut = 0;
}
}
if(tV.NoteCutOn) {
if(tV.NoteCutWait <= 0) {
tV.NoteCutOn = 0;
if(tV.HardCutRelease) {
tV.ADSR.rVolume = -(tV.ADSRVolume - (tV.Instrument.Envelope.rVolume << 8))/tV.HardCutReleaseF;
tV.ADSR.rFrames = tV.HardCutReleaseF;
tV.ADSR.aFrames = tV.ADSR.dFrames = tV.ADSR.sFrames = 0;
} else
tV.NoteMaxVolume = 0;
} else
tV.NoteCutWait--;
}
//adsrEnvelope
if(tV.ADSR.aFrames) {
tV.ADSRVolume += tV.ADSR.aVolume; // Delta
if(--tV.ADSR.aFrames <= 0) tV.ADSRVolume = tV.Instrument.Envelope.aVolume << 8;
} else if(tV.ADSR.dFrames) {
tV.ADSRVolume += tV.ADSR.dVolume; // Delta
if(--tV.ADSR.dFrames <= 0) tV.ADSRVolume = tV.Instrument.Envelope.dVolume << 8;
} else if(tV.ADSR.sFrames) {
tV.ADSR.sFrames--;
} else if(tV.ADSR.rFrames) {
tV.ADSRVolume += tV.ADSR.rVolume; // Delta
if(--tV.ADSR.rFrames <= 0) tV.ADSRVolume = tV.Instrument.Envelope.rVolume << 8;
}
//VolumeSlide
tV.NoteMaxVolume = tV.NoteMaxVolume + tV.VolumeSlideUp - tV.VolumeSlideDown;
if(tV.NoteMaxVolume < 0) tV.NoteMaxVolume = 0;
if(tV.NoteMaxVolume > 0x40) tV.NoteMaxVolume = 0x40;
//Portamento
if(tV.PeriodSlideOn) {
if(tV.PeriodSlideWithLimit) {
var d0 = tV.PeriodSlidePeriod - tV.PeriodSlideLimit;
var d2 = tV.PeriodSlideSpeed;
if(d0 > 0) d2 = -d2;
if(d0) {
var d3 = (d0 + d2) ^ d0;
if(d3 >= 0) d0 = tV.PeriodSlidePeriod + d2;
else d0 = tV.PeriodSlideLimit;
tV.PeriodSlidePeriod = d0;
tV.PlantPeriod = 1;
}
} else {
tV.PeriodSlidePeriod += tV.PeriodSlideSpeed;
tV.PlantPeriod = 1;
}
}
//Vibrato
if(tV.VibratoDepth) {
if(tV.VibratoDelay <= 0) {
//tV.VibratoPeriod = (this.VibratoTable[tV.VibratoCurrent] * tV.VibratoDepth) >> 7;
var vc = tV.VibratoCurrent;
var vt;
if (tV.VibratoCurrent > 31) vt = -this.VibratoTable[32-tV.VibratoCurrent];
else vt = this.VibratoTable[tV.VibratoCurrent];
tV.VibratoPeriod = (vt * tV.VibratoDepth) >> 7;
tV.PlantPeriod = 1;
tV.VibratoCurrent = (vc + tV.VibratoSpeed) & 0x3f;
} else tV.VibratoDelay--;
}
//PList
if(tV.Instrument && tV.PerfCurrent < tV.Instrument.PList.Length) {
if(--tV.PerfWait <= 0) {
var Cur = tV.PerfCurrent++;
tV.PerfWait = tV.PerfSpeed;
if(tV.PerfList.Entries[Cur].Waveform) {
tV.Waveform = tV.PerfList.Entries[Cur].Waveform-1;
tV.NewWaveform = 1;
tV.PeriodPerfSlideSpeed = tV.PeriodPerfSlidePeriod = 0;
}
//Holdwave
tV.PeriodPerfSlideOn = 0;
for(var i = 0; i < 2; i++) this.PListCommandParse(v, tV.PerfList.Entries[Cur].FX[i], tV.PerfList.Entries[Cur].FXParam[i]);
//GetNote
if(tV.PerfList.Entries[Cur].Note) {
tV.InstrPeriod = tV.PerfList.Entries[Cur].Note;
tV.PlantPeriod = 1;
tV.FixedNote = tV.PerfList.Entries[Cur].Fixed;
}
}
} else {
if(tV.PerfWait) tV.PerfWait--;
else tV.PeriodPerfSlideSpeed = 0;
}
//PerfPortamento
if(tV.PeriodPerfSlideOn) {
tV.PeriodPerfSlidePeriod -= tV.PeriodPerfSlideSpeed;
if(tV.PeriodPerfSlidePeriod) tV.PlantPeriod = 1;
}
if(tV.Waveform == 3-1 && tV.SquareOn) {
if(--tV.SquareWait <= 0) {
var d1 = tV.SquareLowerLimit;
var d2 = tV.SquareUpperLimit;
var d3 = tV.SquarePos;
if(tV.SquareInit) {
tV.SquareInit = 0;
if(d3 <= d1) {
tV.SquareSlidingIn = 1;
tV.SquareSign = 1;
} else if(d3 >= d2) {
tV.SquareSlidingIn = 1;
tV.SquareSign = -1;
}
}
//NoSquareInit
if(d1 == d3 || d2 == d3) {
if(tV.SquareSlidingIn) {
tV.SquareSlidingIn = 0;
} else {
tV.SquareSign = -tV.SquareSign;