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audio.js
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audio.js
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// Copyright 2011-2012 Kevin Reid under the terms of the MIT License as detailed
// in the accompanying file README.md or <http://opensource.org/licenses/MIT>.
/*global AudioContext: false, webkitAudioContext: false */
(function () {
"use strict";
var ID_EMPTY = cubes.Blockset.ID_EMPTY;
var ID_LIMIT = cubes.Blockset.ID_LIMIT;
var LAudioContext = typeof AudioContext !== "undefined" ? AudioContext
: typeof webkitAudioContext !== "undefined" ? webkitAudioContext : null;
var supported = !!LAudioContext;
function Audio(config) {
var context;
if (supported) {
context = new LAudioContext(); /* feature test point */
}
// TODO: leaks garbage block types and uses serial numbers. Use WeakMap instead once Chrome supports it
var blockSoundTable = [];
// --- Utilities ---
var bsSampleRate = 22050;
// Parameters to subSynth defining each sound.
var synthParameters = {
create: [0.5, 0.1, 0, false, 1],
destroy: [1, 0.22, 0.2, true, 1],
footstep: [0.18, 0.1, 0, true, 1],
become: [0.05, 0.1, 0, false, 0.2]
};
function SynthData(type) {
var blockWorld = type.world;
// cache
var types, counts, buffers;
function readBlock() {
var i;
// Find volumes of material in the block
counts = [];
for (i = 0; i < ID_LIMIT; i++) counts.push(0);
var raw = blockWorld.raw;
for (i = raw.length - 1; i >= 0; i--) {
counts[raw[i]]++;
}
types = blockWorld.blockset.getAll();
buffers = Object.create(null);
}
function subSynth(duration, variation, echo, noise, gain) {
var i;
var bsSamples = Math.round(duration * bsSampleRate);
var b = context.createBuffer(1, bsSamples, bsSampleRate);
var a = b.getChannelData(0);
var basePitch = 40;
var totalAmp = 0;
var color = [];
for (var value = ID_EMPTY + 1; value < ID_LIMIT; value++) {
var count = counts[value];
if (count === 0) continue;
types[value].writeColor(1, color, 0);
//var luminance = Math.floor((0.2126*color[0]+0.7152*color[1]+0.0722*color[2])*16)/16;
for (var c = 0; c < 3; c++) {
var luminance = color[c];
var pitch = basePitch * Math.exp(3*luminance) * (1 - variation/2+Math.random()*variation);
var pitchInSampleUnits = pitch / bsSampleRate;
for (i = 0; i < bsSamples; i++) {
//a[i] += spanCount*square(i * pitchInSampleUnits);
a[i] += count*Math.floor((i*pitchInSampleUnits) % 1 * 2);
}
totalAmp += count;
}
}
var normalize = totalAmp > 0 ? gain/totalAmp : 0;
for (i = 0; i < bsSamples; i++) {
a[i] *= normalize;
}
if (noise) {
for (i = 0; i < bsSamples; i++) {
var interp = i/bsSamples;
a[i] = a[i]*(1-interp) + Math.random()*interp*0.2;
}
}
var decay = -5/bsSamples;
for (i = 0; i < bsSamples; i++) {
a[i] *= Math.exp(i*decay);
}
if (echo > 0) {
var lookback = Math.floor(0.04 * bsSampleRate);
for (i = 0; i < bsSamples; i++) {
a[i] += i >= lookback ? a[i-lookback]*echo : 0;
}
}
if (!isFinite(a[0])) {
if (typeof console !== "undefined")
console.error("Synthesis produced bad data: ", a[0]);
}
return b;
}
this.get = function (name) { // NOT safe for arbitrary input
return buffers[name] || (buffers[name] = subSynth.apply(undefined, synthParameters[name]));
};
// --- Initialization ---
readBlock();
type.listen({
interest: function () { return true; },
appearanceChanged: readBlock
});
}
function getSynthData(blockType) {
var synthData = blockSoundTable[blockType._serial /* TODO kludge */];
if (!synthData) {
synthData = blockSoundTable[blockType._serial] = new SynthData(blockType);
}
return synthData;
}
// --- Object ---
return Object.freeze({
supported: supported,
setListener: !supported ? function () {return null;} : function (pos, fwd) {
context.listener.gain = 0.3;
context.listener.setPosition(pos[0],pos[1],pos[2]);
context.listener.setOrientation(fwd[0],fwd[1],fwd[2], 0,1,0); // assumed 'up' vector
},
play: !supported ? function () {} : function (pos, blockType, kind, gain) {
if (!config.sound.get()) return;
if (!blockType.world) return;
var buffer = getSynthData(blockType).get(kind);
if (!buffer) return;
var panner = context.createPanner();
panner.setPosition(pos[0],pos[1],pos[2]);
var source = context.createBufferSource();
source.buffer = buffer;
source.playbackRate.value = 0.98 + Math.random() * 0.04;
var gainN = context.createGain();
gainN.gain.value = gain;
source.connect(gainN);
gainN.connect(panner);
panner.connect(context.destination);
source.start(0);
}
});
}
Audio.supported = supported;
cubes.Audio = Object.freeze(Audio);
}());