113 lines
3.1 KiB
JavaScript
113 lines
3.1 KiB
JavaScript
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//
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// nitroAudio.js
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//--------------------
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// Provides an interface for playing nds music and sound effects.
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// by RHY3756547
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//
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window.AudioContext = window.AudioContext || window.webkitAudioContext;
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window.nitroAudio = new (function() {
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var t = this;
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var ctx;
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t.sounds = [];
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t.tick = tick;
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t.playSound = playSound;
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t.kill = kill;
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t.init = init;
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t.instaKill = instaKill;
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t.sdat = null;
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function init(sdat) {
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ctx = new AudioContext();
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t.ctx = ctx;
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var listener = ctx.listener;
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listener.dopplerFactor = 1;
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listener.speedOfSound = 100/1024; //343.3
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SSEQWaveCache.init(sdat, ctx);
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t.sdat = sdat;
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}
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function tick() {
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for (var i=0; i<t.sounds.length; i++) {
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var snd = t.sounds[i];
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snd.seq.tick();
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if (snd.obj != null && snd.obj.soundProps != null && snd.panner != null) updatePanner(snd.panner, snd.obj.soundProps);
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}
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for (var i=0; i<t.sounds.length; i++) {
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var snd = t.sounds[i];
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snd.dead = snd.seq.dead;
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if (snd.dead) {
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snd.gainN.disconnect();
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t.sounds.splice(i--, 1);
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}
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}
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}
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function kill(sound) {
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if (!sound.killing) {
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sound.killing = true;
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sound.seq.kill();
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}
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}
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function instaKill(sound) { //instantly kills a sound
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if (sound == null) return;
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var ind = t.sounds.indexOf(sound)
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sound.gainN.disconnect();
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if (ind == -1) return;
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t.sounds.splice(ind, 1);
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}
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function playSound(seqN, params, arcN, obj) { //if arc is not specified, we just play a normal sequence. this allows 3 overloads.
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//obj should have a property "soundProps" where it sets its falloff, position and velocity relative to the oberver occasionally
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var sound = { dead: false, killing: false, obj: obj };
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var output;
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if (obj != null) { //if obj is not null then we have a 3d target to assign this sound to.
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output = ctx.createPanner();
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sound.gainN = ctx.createGain();
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sound.gainN.connect(ctx.destination);
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output.connect(sound.gainN);
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sound.panner = output;
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updatePanner(sound.panner, sound.obj.soundProps);
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} else {
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output = ctx.createGain();
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sound.gainN = output;
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output.connect(ctx.destination);
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}
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var player;
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if (arcN == null) {
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var seq = t.sdat.sections["$INFO"][0][seqN];
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if (seq == null) return;
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sound.seq = new SSEQPlayer(seq, t.sdat, ctx, output, params);
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} else {
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var arc = t.sdat.sections["$INFO"][1][arcN];
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if (arc == null) return;
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var seq = arc.arc.entries[seqN];
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if (seq == null) return;
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sound.seq = new SSEQPlayer(seq, t.sdat, ctx, output, params);
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}
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//now that we have the player, package it in an object
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t.sounds.push(sound);
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return sound;
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}
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function updatePanner(panner, soundProps) {
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if (panner == null || soundProps == null) return;
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if (soundProps.pos != null) panner.setPosition(soundProps.pos[0], soundProps.pos[1], soundProps.pos[2]);
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//if (soundProps.vel != null) panner.setVelocity(soundProps.vel[0], soundProps.vel[1], soundProps.vel[2]);
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if (soundProps.refDistance != null) panner.refDistance = soundProps.refDistance;
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if (soundProps.panningModel != null) panner.panningModel = soundProps.panningModel;
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if (soundProps.rolloffFactor != null) panner.rolloffFactor = soundProps.rolloffFactor;
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}
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})();
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