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cache noise

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This commit is contained in:
Felix Roos 2023-10-03 12:25:47 +02:00
parent 4b64168faa
commit 047129223e
1 changed files with 14 additions and 3 deletions
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17
packages/superdough/noise.mjs
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@ -1,9 +1,14 @@
import { drywet } from './helpers.mjs'; import { drywet } from './helpers.mjs';
import { getAudioContext } from './superdough.mjs'; import { getAudioContext } from './superdough.mjs';
// expects one of noises as type let noiseCache = {};
export function getNoiseOscillator(type = 'white', t) {
// lazy generates noise buffers and keeps them forever
function getNoiseBuffer(type) {
const ac = getAudioContext(); const ac = getAudioContext();
if (noiseCache[type]) {
return noiseCache[type];
}
const bufferSize = 2 * ac.sampleRate; const bufferSize = 2 * ac.sampleRate;
const noiseBuffer = ac.createBuffer(1, bufferSize, ac.sampleRate); const noiseBuffer = ac.createBuffer(1, bufferSize, ac.sampleRate);
const output = noiseBuffer.getChannelData(0); const output = noiseBuffer.getChannelData(0);
@ -31,9 +36,15 @@ export function getNoiseOscillator(type = 'white', t) {
b6 = white * 0.115926; b6 = white * 0.115926;
} }
} }
noiseCache[type] = noiseBuffer;
return noiseBuffer;
}
// expects one of noises as type
export function getNoiseOscillator(type = 'white', t) {
const ac = getAudioContext();
const o = ac.createBufferSource(); const o = ac.createBufferSource();
o.buffer = noiseBuffer; o.buffer = getNoiseBuffer(type);
o.loop = true; o.loop = true;
o.start(t); o.start(t);
return { return {