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support negative fenv

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This commit is contained in:
Felix Roos
2023-09-15 23:12:51 +02:00
parent 9d5f919023
commit 828e475921
1 changed files with 14 additions and 3 deletions
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packages/superdough/helpers.mjs
+14 -3
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@@ -1,4 +1,5 @@
import { getAudioContext } from './superdough.mjs';
import { clamp } from './util.mjs';
export function gainNode(value) {
const node = getAudioContext().createGain();
@@ -85,9 +86,19 @@ export function createFilter(context, type, frequency, Q, attack, decay, sustain
filter.frequency.value = frequency;
// Apply ADSR to filter frequency
if (fenv > 0) {
const min = frequency;
const max = Math.min(frequency + 200 * 2 ** fenv, 20000);
if (fenv !== 0) {
let min = 0;
let max = Math.sign(fenv) * 200 * 2 ** Math.abs(fenv);
if (max < min) {
// offset by max: keep range when *penv sign is flipped
// comment those lines out to center around cutoff instead peak
min += Math.abs(max);
max += Math.abs(max);
}
min = clamp(min + frequency, 0, 20000);
max = clamp(max + frequency, 0, 20000);
// console.log('min', min, 'max', max);
getParamADSR(filter.frequency, attack, decay, sustain, release, min, max, start, end);
return filter;
}