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wave_shaper.html
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wave_shaper.html
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<!DOCTYPE html>
<html>
<head>
<title>Wave Shaper</title>
<link rel="icon" href="res/favicon.ico">
<script id="bg_vert_sh" type="text/glsl">#version 300 es
in vec2 pos;
out vec2 pix;
uniform mediump vec2 halfRes;
void main() {
pix = (pos + 1.0) * halfRes;
gl_Position = vec4(pos, 0, 1);
}
</script>
<script id="bg_frag_sh" type="text/glsl">#version 300 es
precision mediump float;
in vec2 pix;
out vec4 clr;
uniform vec2 halfRes;
float line(float x) {
return clamp((2.0 - abs(x)) / fwidth(x), 0.0, 1.0);
}
void main() {
float xaxis = line(pix.x - halfRes.x);
float yaxis = line(pix.y - halfRes.y);
float xgrid = line(2.0 * mod(pix.x - halfRes.x, 0.1 * halfRes.x));
float ygrid = line(2.0 * mod(pix.y - halfRes.y, 0.1 * halfRes.y));
float gray = 0.3 * clamp(xaxis + yaxis + xgrid + ygrid, 0.0, 1.0);
clr = vec4(gray, gray, gray, 1);
}
</script>
<script id="line_vert_sh" type="text/glsl">#version 300 es
in vec2 pos;
void main() {
//vec2 p = (pos + 1.0) / 2.0;
//gl_Position = vec4(p.x, -p.y, 0, 1);
gl_Position = vec4(pos, 0, 1);
}
</script>
<script id="line_frag_sh" type="text/glsl">#version 300 es
precision mediump float;
out vec4 clr;
void main() {
clr = vec4(1.0, 0.5, 0.0, 1);
}
</script>
<script type="text/javascript">
const kHalfCurveSize = 512;
const kCurveSize = 2 * kHalfCurveSize + 1;
class WaveView {
constructor(canvas) {
this.dirty = true;
this.curveAudio = new Float32Array(kCurveSize);
this.curveGL = new Float32Array(2 * kCurveSize);
this.audioCtx = null;
this.audioOscillator = null;
this.audioBuffer = null;
this.audioDryGain = null;
this.audioWaveShaper = null;
this.audioWetGain = null;
this.audioVolumeGain = null;
this.autoDistortInterval = null;
const halfResX = canvas.clientWidth / 2;
const halfResY = canvas.clientHeight / 2;
const kLeftClick = 0;
const kRightClick = 2;
this.mouseButton = -1;
const mouseHandler = (e, down) => {
const mousePosX = (e.offsetX / halfResX) - 1;
const mousePosY = 1 - (e.offsetY / halfResY);
if (this.mouseButton == kLeftClick) {
this.mouseLeft(down, mousePosX, mousePosY);
e.preventDefault();
} else if (this.mouseButton == kRightClick) {
this.mouseRight(down, mousePosX, mousePosY);
e.preventDefault();
}
};
canvas.addEventListener('mousedown', e => {
if (this.mouseButton != -1) return;
this.mouseButton = e.button;
mouseHandler(e, true);
});
canvas.addEventListener('mousemove', e => mouseHandler(e, false));
canvas.addEventListener('contextmenu', e => e.preventDefault());
window.addEventListener('mouseup', e => {
if (e.button == this.mouseButton) this.mouseButton = -1;
});
const gl = this.gl = canvas.getContext('webgl2');
if (gl == null) {
console.error('Failed to create web GL 2 context.');
return;
}
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
const loadShader = (vert_id, frag_id) => {
const load = (type, src_id) => {
const shader = gl.createShader(type);
gl.shaderSource(shader, document.getElementById(src_id).innerText);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
console.error('Shader compile error\n', gl.getShaderInfoLog(shader));
gl.deleteShader(shader);
return null;
}
return shader;
}
const vertexShader = load(gl.VERTEX_SHADER, vert_id);
const fragmentShader = load(gl.FRAGMENT_SHADER, frag_id);
const sh = gl.createProgram();
gl.attachShader(sh, vertexShader);
gl.attachShader(sh, fragmentShader);
gl.linkProgram(sh);
if (!gl.getProgramParameter(sh, gl.LINK_STATUS)) {
console.error('Shader link error\n', gl.getProgramInfoLog(sh));
return null;
}
gl.useProgram(sh);
return sh;
}
this.shBg = loadShader('bg_vert_sh', 'bg_frag_sh');
if (!this.shBg) return;
const idBgHalfRes = gl.getUniformLocation(this.shBg, 'halfRes');
gl.uniform2f(idBgHalfRes, halfResX, halfResY);
this.idBgPos = gl.getAttribLocation(this.shBg, 'pos');
this.bufBgPos = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, this.bufBgPos);
gl.bufferData(
gl.ARRAY_BUFFER, new Float32Array([-1, -1, -1, 1, 1, 1, 1, -1]),
gl.STATIC_DRAW, 0, 8);
gl.enableVertexAttribArray(this.idBgPos);
this.shLine = loadShader('line_vert_sh', 'line_frag_sh');
if (!this.shLine) return;
this.idLinePos = gl.getAttribLocation(this.shLine, 'pos');
this.bufLinePos = gl.createBuffer();
gl.enableVertexAttribArray(this.idLinePos);
this.fillCurve(x => x);
const draw = t => {
if (this.dirty) {
this.dirty = false;
gl.clear(gl.COLOR_BUFFER_BIT);
gl.useProgram(this.shBg);
gl.bindBuffer(gl.ARRAY_BUFFER, this.bufBgPos);
gl.vertexAttribPointer(this.idBgPos, 2, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.TRIANGLE_FAN, 0, 4);
gl.useProgram(this.shLine);
gl.bindBuffer(gl.ARRAY_BUFFER, this.bufLinePos);
gl.vertexAttribPointer(this.idLinePos, 2, this.gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.LINE_STRIP, 0, kCurveSize);
}
window.requestAnimationFrame(draw);
}
window.requestAnimationFrame(draw);
}
mouseLeft(down, x, y) {
console.log("left", down, x, y);
}
mouseRight(down, x, y) {
console.log("right", down, x, y);
}
fillCurve(fn) {
for (let i = 0, j = 0; i < kCurveSize; ++i, ++j) {
const x = (i / kHalfCurveSize) - 1;
const y = fn(x);
this.curveGL[j] = x;
++j;
this.curveGL[j] = y;
this.curveAudio[i] = y;
}
this.dirty = true;
this.gl.bindBuffer(this.gl.ARRAY_BUFFER, this.bufLinePos);
this.gl.bufferData(this.gl.ARRAY_BUFFER, this.curveGL, this.gl.DYNAMIC_DRAW,
0, 2 * kCurveSize);
if (this.audioWaveShaper != null) {
this.audioWaveShaper.curve = this.curveAudio;
}
}
fillCurveWithEval(src) {
try {
this.fillCurve(Function('"use strict";return ((x)=>(' + src + '))')());
} catch (e) {
console.error(src, e);
}
}
ensureAudio() {
if (this.audioCtx == null) {
this.audioCtx = new window.AudioContext();
this.audioOscillator = this.audioCtx.createOscillator();
this.audioOscillator.type = 'sine';
this.audioOscillator.frequency.value = 261.626; // C3
this.audioSourceGain = this.audioCtx.createGain();
this.audioSourceGain.gain.value = 0;
this.audioDryGain = this.audioCtx.createGain();
this.audioDryGain.gain.value = 1;
this.audioWaveShaper = this.audioCtx.createWaveShaper();
this.audioWaveShaper.oversample = 'none';
this.audioWaveShaper.curve = this.curveAudio;
this.audioWetGain = this.audioCtx.createGain();
this.audioWetGain.gain.value = 0;
this.audioVolumeGain = this.audioCtx.createGain();
this.audioVolumeGain.gain.value = 1;
this.audioOscillator.connect(this.audioSourceGain);
this.audioSourceGain.connect(this.audioDryGain);
this.audioSourceGain.connect(this.audioWaveShaper);
this.audioDryGain.connect(this.audioVolumeGain);
this.audioWaveShaper.connect(this.audioWetGain);
this.audioWetGain.connect(this.audioVolumeGain);
this.audioVolumeGain.connect(this.audioCtx.destination);
this.audioOscillator.start();
}
}
setGain(node, value) {
const dt = 0.03;
const t = this.audioCtx.currentTime;
node.gain.cancelScheduledValues(t + dt);
node.gain.setValueAtTime(node.gain.value, t + dt);
node.gain.linearRampToValueAtTime(value, t + 2 * dt);
}
setAudioEnabled(enable) {
this.ensureAudio();
if (enable) {
// this.audioCtx.resume();
} else {
// window.setTimeout(() => this.audioCtx.suspend(), 1);
}
this.setGain(this.audioSourceGain, enable ? 0.1 : 0);
}
setInputWave(value) {
this.ensureAudio();
if (this.audioBuffer != null) {
this.audioBuffer.disconnect(this.audioSourceGain);
this.audioBuffer = null;
}
this.audioOscillator.connect(this.audioSourceGain);
this.audioOscillator.type = value;
}
setVolume(value) {
this.ensureAudio();
this.setGain(this.audioVolumeGain, value);
}
setDistortImpl(value) {
this.setGain(this.audioDryGain, 1 - value);
this.setGain(this.audioWetGain, value);
}
setAutoDistort(value) {
this.ensureAudio();
if (value) {
const initTime = this.audioCtx.currentTime;
this.autoDistortInterval = window.setInterval(() => {
const t = this.audioCtx.currentTime - initTime;
const value = 0.5 - 0.5 * Math.cos(t);
document.getElementById("distort").value = value;
this.setDistortImpl(value);
}, 60);
} else {
window.clearInterval(this.autoDistortInterval);
}
}
setDistort(value) {
this.setAutoDistort(false);
this.setDistortImpl(value);
}
async setCustomWave(file) {
this.ensureAudio();
if (this.audioBuffer != null) {
this.audioBuffer.disconnect(this.audioSourceGain);
}
this.audioBuffer = this.audioCtx.createBufferSource();
this.audioBuffer.loop = true;
this.audioBuffer.buffer =
await this.audioCtx.decodeAudioData(await file.arrayBuffer());
try {
this.audioOscillator.disconnect(this.audioSourceGain);
} catch(e) {}
this.audioBuffer.connect(this.audioSourceGain);
this.audioBuffer.start();
}
}
let waveView = null;
let domFunc = null;
function onLoad() {
waveView = new WaveView(document.getElementById('wave_view'));
domFunc = document.getElementById('func');
domFunc.addEventListener('keydown', onFuncChange);
}
window.addEventListener('load', onLoad);
function onFuncChange(e) {
if (e.keyCode == 13 || e.keyCode == 222) {
e.preventDefault();
const src = domFunc.value;
waveView.fillCurveWithEval(src != '' ? src : 'x');
}
}
let audioEnabled = false;
function toggleAudio(domToggleAudio) {
if (!waveView) return;
audioEnabled = !audioEnabled;
domToggleAudio.innerText = audioEnabled ? "Disable audio" : "Enable audio";
waveView.setAudioEnabled(audioEnabled);
}
function setInputWave(value) {
if (!waveView) return;
waveView.setInputWave(value);
}
function setVolume(value) {
if (!waveView) return;
waveView.setVolume(parseFloat(value));
}
function setDistort(value) {
if (!waveView) return;
waveView.setDistort(parseFloat(value));
}
function setAutoDistort(value) {
if (!waveView) return;
waveView.setAutoDistort(value);
}
function onFile(file) {
if (!waveView) return;
waveView.setCustomWave(file);
}
</script>
<style>
body {
background-color: #212121;
margin: 0;
}
#head {
background-color: #424242;
width: 100%;
display: flex;
justify-content: space-around;
margin-bottom: 16px;
}
h1, #index {
color: #ffc107;
text-align: center;
font-family: monospace;
font-size: 42px;
flex-grow: 1;
padding: 16px;
margin: 0;
}
#index {
color: #ff5722;
text-decoration: none;
flex-grow: 0;
}
h2 {
color: #ff5722;
font-family: monospace;
}
a {
color: #ffc107;
font-family: monospace;
font-size: 16px;
cursor: pointer;
text-decoration: underline;
}
#wrap {
padding: 0 16px;
color: #f5f5f5;
font-family: monospace;
font-size: 16px;
display: flex;
justify-content: center;
}
#menu {
padding-left: 16px;
}
#func {
resize: none;
margin-left: 8px;
}
.menu_row {
padding-top: 1em;
display: flex;
flex-direction: row;
}
.menu_label {
margin-right: 8px;
}
input[type="file"] {
display: none;
}
#file_upload {
margin-left: 8px;
}
</style>
</head>
<body>
<div id="head">
<a id="index" href="index.html"><</a>
<h1>Wave Shaper</h1>
</div>
<div id="wrap">
<canvas id="wave_view" width="800" height="800"></canvas>
<div id="menu">
<a onclick="toggleAudio(this)">Start audio</a>
<div class="menu_row">
f(x) =
<textarea id="func" rows="1" cols="30" placeholder="x">x</textarea>
</div>
<div class="menu_row">
<label for="wave" class="menu_label">Input wave:</label>
<select id="wave" onchange="setInputWave(this.value)">
<option value="sine">Sine</option>
<option value="square">Square</option>
<option value="sawtooth">Sawtooth</option>
<option value="triangle">Triangle</option>
</select>
<label id="file_upload">
<input type="file" accept="audio/*" onchange="onFile(this.files[0])">
<a>or choose a file</a>
</label>
</div>
<div class="menu_row">
<label for="volume" class="menu_label">Volume:</label>
<input type="range" id="volume" min="0" max="1" value="1" step="0.01"
onchange="setVolume(this.value)"/>
</div>
<div class="menu_row">
<label for="distort" class="menu_label">Distort:</label>
<input type="range" id="distort" min="0" max="1" value="0" step="0.01"
onchange="setDistort(this.value)"/>
<input type="checkbox" id="autodistort"
onchange="setAutoDistort(this.checked)"/>
</div>
</div>
</div>
</body>
</html>