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v7.html
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v7.html
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<!--
Part of a suite: noiz (2020)
Copyright (C) 2020 真空 (@ Menhera.org) All rights reserved.
This work is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This work 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
-->
<!doctype html>
<html lang="en">
<meta charset="utf-8">
<title>noiz - Version 7</title>
<style>
body {
margin: 0;
}
article {
margin: 1em;
}
input[type="range"] {
display: block;
box-sizing: border-box;
inline-size: 100%;
}
</style>
<article>
<h1><i>noiz</i>: <i>Version 7</i></h1>
<p>Work by <span lang="ja">真空</span></p>
<p>Year: 2020</p>
<p><strong>This page plays sounds. There are problems reported with Safari.</strong></p>
<p><label><input type="checkbox" checked id="control_update" autocomplete="off"> Update</label></p>
<p><label>Mean update interval: <input type="range" min="1" max="60" value="5" autocomplete="off" id="control_delay"></label></p>
<p><label>Threshold: <input type="range" min="50" max="100" value="85" autocomplete="off" id="control_threshold"></label></p>
<p><label>Exponent: <input type="range" min="32768" max="131072" value="80000" autocomplete="off" id="control_exp"></label></p>
<p><label>Density: <input type="range" min="4" max="256" value="32" autocomplete="off" id="control_rate"></label></p>
</article>
<noiz-visualizer id="visualizer"></noiz-visualizer>
<script>
const control_update = document.getElementById('control_update');
const control_delay = document.getElementById('control_delay');
const control_threshold = document.getElementById('control_threshold');
const control_exp = document.getElementById('control_exp');
const control_rate = document.getElementById('control_rate');
const visualizer = document.getElementById('visualizer');
const DIVISION = 12;
const BASE = 32.70319566257483;
const E = 65536;
const R = 32;
const C = .75;
const RANGE = 7;
{
const shadows = new WeakMap;
customElements.define('noiz-visualizer',
class NoizVisualizerElement extends HTMLElement {
constructor()
{
super();
const shadow = Object.create(null);
shadows.set(this, shadow);
shadow.root = this.attachShadow({mode: 'closed'});
shadow.container = document.createElement('div');
shadow.root.append(shadow.container);
shadow.container.style.position = 'relative';
this.aspectRatio = .5625;
shadow.grid = document.createElement('div');
shadow.container.append(shadow.grid);
shadow.grid.style.display = 'grid';
shadow.grid.style.position = 'absolute';
shadow.grid.style.top = '0';
shadow.grid.style.left = '0';
shadow.grid.style.width = '100%';
shadow.grid.style.height = '100%';
shadow.grid.style.gridAutoRows = '1fr';
shadow.recalc = () => void 0;
shadow.size = new Uint32Array(2);
this.resize(0, 0);
}
get aspectRatio()
{
const shadow = shadows.get(this);
return shadow.aspectRatio;
}
set aspectRatio(aspectRatio)
{
const shadow = shadows.get(this);
shadow.aspectRatio = isFinite(aspectRatio) && 0 < aspectRatio
? Number(aspectRatio) : 1;
shadow.container.style.paddingBlockEnd = `${shadow.aspectRatio * 100}%`;
}
get size()
{
const shadow = shadows.get(this);
return new Uint32Array(shadow.size);
}
resize(nCols, nRows)
{
const shadow = shadows.get(this);
shadow.size[0] = nCols;
shadow.size[1] = nRows;
[... shadow.grid.childNodes].forEach(node => node.remove());
for (let i = 0; i < shadow.size[0] * shadow.size[1]; i++) {
const item = document.createElement('div');
shadow.grid.append(item);
item.style.backgroundColor = '#000';
item.style.opacity = '0';
}
shadow.grid.style.gridTemplateColumns = `repeat(${shadow.size[0]}, 1fr)`;
}
set(aCol, aRow, aValue)
{
const [col, row] = new Uint32Array([aCol, aRow]);
const value = isFinite(aValue)
? Math.min(1, Math.max(0, aValue)) : 1;
const shadow = shadows.get(this);
const logValue = Math.max(0, 1 + Math.log(value) / 11.090354888959124951);
shadow.grid.children[col + row * shadow.size[0]].style.opacity = '' + logValue;
}
}
);
}
const ac = new (window.AudioContext || window.webkitAudioContext);
const interval01 = (leftIsClosed, rightIsClosed) => {
let x;
do {
x = Math.random();
} while (x == 0 && !leftIsClosed || x == 1 && !rightIsClosed);
return x;
};
const logRandom = e => {
if (!e || isNaN(e) || e <= 0) {
return (Math.E ** Math.random() - 1) / (Math.E - 1);
} else if (e == 1) {
return Math.random();
} else if (e > 1) {
return (e ** Math.random() - 1) / (e - 1);
} else {
const e1 = 1 / e;
return 1 - (e1 ** Math.random() - 1) / (e1 - 1);
}
};
const logisticRandom = r => {
return 1 / (1 + Math.exp(- r * (Math.random() - control_threshold.value / 100)));
};
const pitches = new Float64Array(RANGE);
const updatePitch = () => {
for (let i = 0; i < RANGE; i++) {
pitches[i] = control_exp.value * (1 + interval01(true, true));
}
};
const shuf = (() => {
const RAW_RANGE = 1 + 2 ** (RANGE - 1);
const re = new Float32Array(RAW_RANGE);
const im = new Float32Array(RAW_RANGE);
return levels => {
for (let i = 0; i < RANGE; i++) {
const phase = 2 * Math.PI * interval01(true, false);
const abs = logRandom(pitches[i]);
const j = 2 ** i;
re[j] = abs * Math.cos(phase);
im[j] = abs * Math.sin(phase);
levels[i] = abs;
}
return ac.createPeriodicWave(re, im);
};
})();
const tones = [];
const gains = [];
const levels = [];
for (let i = 0; i < DIVISION; i++) {
tones[i] = ac.createOscillator();
gains[i] = ac.createGain();
gains[i].gain.value = 0.1;
const f = BASE * 2 ** (i / DIVISION);
tones[i].frequency.value = f;
tones[i].connect(gains[i]);
gains[i].connect(ac.destination);
levels[i] = new Float32Array(RANGE);
}
const update = () => {
updatePitch();
tones.forEach(
(osc, i) => osc.setPeriodicWave(shuf(levels[i]))
);
gains.forEach(
(gain, i) => {
const value = 0.2 * logisticRandom(control_rate.value);
levels[i].forEach((abs, j) => void visualizer.set(i, j, abs * value));
gain.gain.value = value;
}
);
};
(async () => {
visualizer.resize(DIVISION, RANGE);
update();
tones.forEach(osc => osc.start());
while (true) {
const mean = Math.trunc(control_delay.value) * 1000;
const delay = Math.trunc(- Math.log(interval01(false, true)) * mean);
// -ln( [Uniform in (0,1)] ) * [avg]
await new Promise(res => setTimeout(res, delay));
if (control_update.checked) {
update();
}
}
})();
document.body.onclick = () => ac.resume();
</script>
</html>