290 lines
9 KiB
JavaScript
290 lines
9 KiB
JavaScript
// js/visualizer.js
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import { visualizerSettings } from './storage.js';
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import { LCDPreset } from './visualizers/lcd.js';
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import { ParticlesPreset } from './visualizers/particles.js';
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import { UnknownPleasuresWebGL } from './visualizers/unknown_pleasures_webgl.js';
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import { ButterchurnPreset } from './visualizers/butterchurn.js';
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import { audioContextManager } from './audio-context.js';
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export class Visualizer {
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constructor(canvas, audio) {
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this.canvas = canvas;
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this.ctx = null;
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this.audio = audio;
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this.audioContext = null;
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this.analyser = null;
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this.isActive = false;
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this.animationId = null;
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this.presets = {
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lcd: new LCDPreset(),
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particles: new ParticlesPreset(),
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'unknown-pleasures': new UnknownPleasuresWebGL(),
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butterchurn: new ButterchurnPreset(),
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};
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this.activePresetKey = visualizerSettings.getPreset();
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// ---- AUDIO BUFFERS (REUSED) ----
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this.bufferLength = 0;
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this.dataArray = null;
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// ---- STATS (REUSED OBJECT) ----
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this.stats = {
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kick: 0,
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intensity: 0,
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energyAverage: 0.3,
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lastBeatTime: 0,
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lastIntensity: 0,
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upbeatSmoother: 0,
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sensitivity: 0.5,
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primaryColor: '#ffffff',
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mode: '',
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};
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// ---- CACHED STATE ----
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this._lastPrimaryColor = '';
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this._resizeBound = () => this.resize();
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}
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get activePreset() {
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return this.presets[this.activePresetKey] || this.presets['lcd'];
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}
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init() {
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// Ensure shared audio context is initialized
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if (!audioContextManager.isReady()) {
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audioContextManager.init(this.audio);
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}
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this.audioContext = audioContextManager.getAudioContext();
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this.analyser = audioContextManager.getAnalyser();
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if (this.analyser) {
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this.bufferLength = this.analyser.frequencyBinCount;
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this.dataArray = new Uint8Array(this.bufferLength);
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}
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}
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/**
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* Get the shared AudioContext for external use
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*/
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getAudioContext() {
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return this.audioContext;
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}
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/**
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* Get the source node
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*/
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getSourceNode() {
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return audioContextManager.getSourceNode();
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}
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initContext() {
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const preset = this.activePreset;
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const type = preset.contextType || '2d';
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const currentType = this._currentContextType;
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// If context type changed, we need to recreate the canvas
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// (you can't get a different context type from the same canvas)
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if (this.ctx && currentType !== type) {
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// Clone and replace canvas to get fresh context
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const parent = this.canvas.parentElement;
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const newCanvas = this.canvas.cloneNode(true);
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parent.replaceChild(newCanvas, this.canvas);
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this.canvas = newCanvas;
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this.ctx = null;
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}
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if (this.ctx) return;
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if (type === 'webgl') {
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this.ctx =
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this.canvas.getContext('webgl2', {
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alpha: true,
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antialias: true,
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preserveDrawingBuffer: true,
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premultipliedAlpha: false,
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}) ||
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this.canvas.getContext('webgl', {
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alpha: true,
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antialias: true,
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preserveDrawingBuffer: true,
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premultipliedAlpha: false,
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});
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} else {
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this.ctx = this.canvas.getContext('2d');
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}
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this._currentContextType = type;
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}
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start() {
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if (this.isActive) return;
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if (!this.ctx) {
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this.initContext();
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}
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if (!this.audioContext) {
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this.init();
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}
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if (!this.analyser) {
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return;
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}
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this.isActive = true;
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if (this.audioContext.state === 'suspended') {
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this.audioContext.resume();
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}
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// Initialize Butterchurn if it's the active preset
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if (this.activePresetKey === 'butterchurn' && this.activePreset.lazyInit) {
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const sourceNode = audioContextManager.getSourceNode();
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this.activePreset.lazyInit(this.canvas, this.audioContext, sourceNode);
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}
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this.resize();
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window.addEventListener('resize', this._resizeBound);
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this.canvas.style.display = 'block';
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this.animate();
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}
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stop() {
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this.isActive = false;
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if (this.animationId) {
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cancelAnimationFrame(this.animationId);
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this.animationId = null;
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}
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window.removeEventListener('resize', this._resizeBound);
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if (this.ctx && this.ctx.clearRect) {
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this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
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}
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this.canvas.style.display = 'none';
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}
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resize() {
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const w = window.innerWidth;
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const h = window.innerHeight;
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if (this.canvas.width !== w) this.canvas.width = w;
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if (this.canvas.height !== h) this.canvas.height = h;
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if (this.activePreset?.resize) {
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this.activePreset.resize(w, h);
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}
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}
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animate = () => {
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if (!this.isActive) return;
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this.animationId = requestAnimationFrame(this.animate);
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// ===== AUDIO ANALYSIS =====
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this.analyser.getByteFrequencyData(this.dataArray);
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// Bass (dynamic bins based on sample rate)
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const volume = 10 * Math.max(this.audio.volume, 0.1);
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// Robust bass detection: sum bins up to ~250Hz
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const binSize = this.audioContext.sampleRate / this.analyser.fftSize;
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const startBin = 1; // Skip DC offset
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// Calculate how many bins cover the bass range (up to 250Hz)
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let numBins = Math.floor(250 / binSize);
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if (numBins < 1) numBins = 1; // Ensure at least one bin is checked
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let maxVal = 0;
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for (let i = 0; i < numBins && (startBin + i) < this.dataArray.length; i++) {
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const val = this.dataArray[startBin + i];
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if (val > maxVal) maxVal = val;
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}
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// Normalize: (Max / 255) / Volume
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let bass = (maxVal) / 255 / volume;
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const intensity = bass * bass * 10;
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const stats = this.stats;
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stats.energyAverage = stats.energyAverage * 0.99 + intensity * 0.01;
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stats.upbeatSmoother = stats.upbeatSmoother * 0.92 + intensity * 0.08;
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// ===== SENSITIVITY =====
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let sensitivity = visualizerSettings.getSensitivity();
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if (visualizerSettings.isSmartIntensityEnabled()) {
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if (stats.energyAverage > 0.4) {
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sensitivity = 0.7;
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} else if (stats.energyAverage > 0.2) {
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sensitivity = 0.1 + ((stats.energyAverage - 0.2) / 0.2) * 0.6;
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} else {
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sensitivity = 0.1;
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}
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}
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// ===== KICK DETECTION =====
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const now = performance.now();
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let threshold = stats.energyAverage < 0.3 ? 0.5 + (0.3 - stats.energyAverage) * 2 : 0.5;
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// Lower threshold for more responsive kick
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if (intensity > threshold * 0.7) {
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if (intensity > stats.lastIntensity + 0.03 && now - stats.lastBeatTime > 50) {
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stats.kick = 1.0;
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stats.lastBeatTime = now;
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} else {
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if (stats.upbeatSmoother > 0.6 && stats.energyAverage > 0.4) {
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const upbeatLevel = (stats.upbeatSmoother - 0.6) / 0.4;
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if (stats.kick < upbeatLevel) {
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stats.kick = upbeatLevel;
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} else {
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stats.kick *= 0.95;
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}
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} else {
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stats.kick *= 0.9;
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}
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}
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} else {
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stats.kick *= 0.95;
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}
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stats.lastIntensity = intensity;
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stats.intensity = intensity;
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stats.sensitivity = sensitivity;
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// ===== COLORS (CACHED) =====
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const color = getComputedStyle(document.documentElement).getPropertyValue('--primary').trim() || '#ffffff';
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if (color !== this._lastPrimaryColor) {
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stats.primaryColor = color;
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this._lastPrimaryColor = color;
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}
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stats.mode = visualizerSettings.getMode();
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// ===== DRAW =====
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this.activePreset.draw(this.ctx, this.canvas, this.analyser, this.dataArray, stats);
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};
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setPreset(key) {
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if (!this.presets[key]) return;
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if (this.activePreset?.destroy) {
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this.activePreset.destroy();
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}
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this.activePresetKey = key;
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this.initContext();
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this.resize();
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// Initialize Butterchurn if switching to it
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if (key === 'butterchurn' && this.presets[key].lazyInit && this.audioContext) {
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const sourceNode = audioContextManager.getSourceNode();
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this.presets[key].lazyInit(this.canvas, this.audioContext, sourceNode);
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}
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}
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}
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