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Merge pull request #1343 from daslyfe/pw

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feat: Create pulsewidth (pw) and pulsewidth lfo parameters
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Jade (Rose) Rowland 2025-05-14 19:12:06 -04:00 • committed by GitHub
commit 1341bd9c92
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4 changed files with 248 additions and 16 deletions
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20
packages/superdough/superdough.mjs
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@ -320,16 +320,9 @@ function getDelay(orbit, delaytime, delayfeedback, t, channels) {
return delays[orbit];
}
function getPhaser(time, end, frequency = 1, depth = 0.5, centerFrequency = 1000, sweep = 2000) {
//gain
const ac = getAudioContext();
const lfoGain = ac.createGain();
lfoGain.gain.value = sweep * 2;
// centerFrequency = centerFrequency * 2;
// sweep = sweep * 1.5;
const lfo = getWorklet(ac, 'lfo-processor', {
frequency,
export function getLfo(audioContext, time, end, properties = {}) {
return getWorklet(audioContext, 'lfo-processor', {
frequency: 1,
depth: 1,
skew: 0,
phaseoffset: 0,
@ -337,8 +330,13 @@ function getPhaser(time, end, frequency = 1, depth = 0.5, centerFrequency = 1000
end,
shape: 1,
dcoffset: -0.5,
...properties,
});
lfo.connect(lfoGain);
}
function getPhaser(time, end, frequency = 1, depth = 0.5, centerFrequency = 1000, sweep = 2000) {
const ac = getAudioContext();
const lfoGain = getLfo(ac, time, end, { frequency, depth: sweep * 2 });
//filters
const numStages = 2; //num of filters in series

29
packages/superdough/synth.mjs
View file

@ -1,5 +1,5 @@
import { clamp, midiToFreq, noteToMidi } from './util.mjs';
import { registerSound, getAudioContext } from './superdough.mjs';
import { registerSound, getAudioContext, getLfo } from './superdough.mjs';
import {
applyFM,
gainNode,
@ -26,6 +26,9 @@ const getFrequencyFromValue = (value) => {
return Number(freq);
};
function destroyAudioWorkletNode(node) {
if (node == null) {
return;
}
node.disconnect();
node.parameters.get('end')?.setValueAtTime(0, 0);
}
@ -145,7 +148,20 @@ export function registerSynthSounds() {
'pulse',
(begin, value, onended) => {
const ac = getAudioContext();
let { duration, n: pulsewidth = 0.5 } = value;
let { pwrate, pwsweep } = value;
if (pwsweep == null) {
if (pwrate != null) {
pwsweep = 0.3;
} else {
pwsweep = 0;
}
}
if (pwrate == null && pwsweep != null) {
pwrate = 1;
}
let { duration, pw: pulsewidth = 0.5 } = value;
const frequency = getFrequencyFromValue(value);
const [attack, decay, sustain, release] = getADSRValues(
@ -153,10 +169,8 @@ export function registerSynthSounds() {
'linear',
[0.001, 0.05, 0.6, 0.01],
);
const holdend = begin + duration;
const end = holdend + release + 0.01;
let o = getWorklet(
ac,
'pulse-oscillator',
@ -178,11 +192,16 @@ export function registerSynthSounds() {
envGain = o.connect(envGain);
getParamADSR(envGain.gain, attack, decay, sustain, release, 0, 1, begin, holdend, 'linear');
let lfo;
if (pwsweep != 0) {
lfo = getLfo(ac, begin, end, { frequency: pwrate, depth: pwsweep });
lfo.connect(o.parameters.get('pulsewidth'));
}
let timeoutNode = webAudioTimeout(
ac,
() => {
destroyAudioWorkletNode(o);
destroyAudioWorkletNode(lfo);
envGain.disconnect();
onended();
fm?.stop();