hacklab/strudel
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Add back mipmaps; add caching

Browse source
This commit is contained in:
Aria 2025-09-30 23:08:28 -05:00
parent bad498a1e5
commit a2b8407fbb
2 changed files with 56 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

45
packages/superdough/worklets.mjs
View file

@ -1043,6 +1043,7 @@ function brownian(x, oct = 4) {
return (sum / norm) * 2 - 1;
}
const tablesCache = {};
class WavetableOscillatorProcessor extends AudioWorkletProcessor {
static get parameterDescriptors() {
return [
@ -1061,7 +1062,6 @@ class WavetableOscillatorProcessor extends AudioWorkletProcessor {
constructor(options) {
super(options);
this.frames = null;
this.frameLen = 0;
this.numFrames = 0;
this.phase = [];
@ -1069,9 +1069,28 @@ class WavetableOscillatorProcessor extends AudioWorkletProcessor {
this.port.onmessage = (e) => {
const { type, payload } = e.data || {};
if (type === 'table') {
this.frames = payload.frames;
const key = payload.key;
this.frameLen = payload.frameLen;
this.numFrames = this.frames.length;
if (!tablesCache[key]) {
const tables = [payload.frames];
let table = tables[0];
for (let level = 1; level < 1; level++) {
const nextLen = table.length >> 1;
const nextTable = table.map((frame) => {
const avg = new Float32Array(nextLen);
for (let i = 0; i < nextLen; i++) {
avg[i] = (frame[2 * i] + frame[2 * i + 1]) / 2;
}
return avg;
});
tables.push(nextTable);
table = nextTable;
if (nextLen <= 32) break;
}
tablesCache[key] = tables;
}
this.tables = tablesCache[key];
this.numFrames = this.tables[0].length;
}
};
}
@ -1222,6 +1241,15 @@ class WavetableOscillatorProcessor extends AudioWorkletProcessor {
return a + (b - a) * frac;
}
_chooseMip(dphi) {
const approxHarm = clamp(dphi, 1e-6, 64);
let level = 0;
while (level + 1 < (this.tables?.length || 1) && approxHarm < this.tables[level][0].length / 8) {
level++;
}
return level;
}
process(_inputs, outputs, parameters) {
if (currentTime >= parameters.end[0]) {
return false;
@ -1231,8 +1259,7 @@ class WavetableOscillatorProcessor extends AudioWorkletProcessor {
}
const outL = outputs[0][0];
const outR = outputs[0][1] || outputs[0][0];
if (!this.frames) {
if (!this.tables) {
outL.fill(0);
if (outR !== outL) outR.set(outL);
return true;
@ -1253,7 +1280,7 @@ class WavetableOscillatorProcessor extends AudioWorkletProcessor {
const gain2 = Math.sqrt(0.5 + 0.5 * spread);
let f = pv(parameters.frequency, i);
f = applySemitoneDetuneToFrequency(f, detune / 100); // overall detune
const normalizer = 0.3 / Math.sqrt(voices);
const normalizer = 1 / Math.sqrt(voices);
for (let n = 0; n < voices; n++) {
const isOdd = (n & 1) == 1;
let gainL = gain1;
@ -1265,12 +1292,14 @@ class WavetableOscillatorProcessor extends AudioWorkletProcessor {
}
const fVoice = applySemitoneDetuneToFrequency(f, getUnisonDetune(voices, detune, n)); // voice detune
const dPhase = fVoice * invSR;
const level = this._chooseMip(dPhase);
const table = this.tables[level];
// warp phase then sample
this.phase[n] = this.phase[n] ?? Math.random() * phaseRand;
const ph = this._warpPhase(this.phase[n], warpAmount, warpMode);
const s0 = this._sampleFrame(this.frames[fIdx], ph);
const s1 = this._sampleFrame(this.frames[Math.min(this.numFrames - 1, fIdx + 1)], ph);
const s0 = this._sampleFrame(table[fIdx], ph);
const s1 = this._sampleFrame(table[Math.min(this.numFrames - 1, fIdx + 1)], ph);
let s = s0 + (s1 - s0) * frac;
if (warpMode === WarpMode.FLIP && this.phase[n] < warpAmount) {
s = -s;