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added distortion effect

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This commit is contained in:
Jade (Rose) Rowland 2024-02-28 14:31:07 -05:00
parent c77b0098a7
commit 1221c6144c
3 changed files with 53 additions and 8 deletions
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22
packages/core/controls.mjs
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@ -1214,19 +1214,31 @@ const generic_params = [
// ['sclaves'],
// ['scrash'],
/**
* Wave shaping distortion. CAUTION: it might get loud
* (Deprecated) Wave shaping distortion. WARNING: can suddenly get unpredictably loud.
* Please use distort instead, which has a more predictable response curve
* second option in optional array syntax (ex: ".9:.5") applies a postgain to the output
* most useful shape values are usually between 0 and 10 (depending on source gain)
*
* @name shape
* @param {number | Pattern} distortion between 0 and 1
* @example
* s("bd sd [~ bd] sd,hh*8").shape("<0 2 3 10:.5>")
* @example
* note("d1!8").s("sine").penv(36).pdecay(.12).decay(.23).shape("8:.4")
* s("bd sd [~ bd] sd,hh*8").shape("<0 .2 .3 .95:.5>")
*
*/
['shape'],
/**
* Wave shaping distortion. CAUTION: it can get loud.
* Second option in optional array syntax (ex: ".9:.5") applies a postgain to the output.
* Most useful values are usually between 0 and 10 (depending on source gain). If you are feeling adventurous, you can turn it up to 11 and beyond ;)
* @name distort
* @param {number | Pattern} distortion
* @example
* s("bd sd [~ bd] sd,hh*8").distort("<0 2 3 10:.5>")
* @example
* note("d1!8").s("sine").penv(36).pdecay(.12).decay(.23).distort("8:.4")
*
*/
['distort', 'dist'],
/**
* Dynamics Compressor. The params are `compressor("threshold:ratio:knee:attack:release")`
* More info [here](https://developer.mozilla.org/en-US/docs/Web/API/DynamicsCompressorNode?retiredLocale=de#instance_properties)

11
packages/superdough/superdough.mjs
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@ -311,6 +311,7 @@ export const superdough = async (value, deadline, hapDuration) => {
coarse,
crush,
shape,
distort,
pan,
vowel,
delay = 0,
@ -452,8 +453,14 @@ export const superdough = async (value, deadline, hapDuration) => {
// effects
coarse !== undefined && chain.push(getWorklet(ac, 'coarse-processor', { coarse }));
crush !== undefined && chain.push(getWorklet(ac, 'crush-processor', { crush }));
const shapeInput = Array.isArray(shape) ? { shape: shape[0], postgain: shape[1] } : { shape };
shape !== undefined && chain.push(getWorklet(ac, 'shape-processor', shapeInput));
if (shape !== undefined) {
const input = Array.isArray(shape) ? { shape: shape[0], postgain: shape[1] } : { shape };
chain.push(getWorklet(ac, 'shape-processor', input));
}
if (distort !== undefined) {
const input = Array.isArray(distort) ? { distort: distort[0], postgain: distort[1] } : { distort };
chain.push(getWorklet(ac, 'distort-processor', input));
}
compressorThreshold !== undefined &&
chain.push(

28
packages/superdough/worklets.mjs
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@ -75,7 +75,8 @@ class ShapeProcessor extends AudioWorkletProcessor {
process(inputs, outputs, parameters) {
let shape = parameters.shape[0];
const postgain = Math.max(0.001, Math.min(1, parameters.postgain[0]));
shape = Math.expm1(shape * 5);
shape = shape < 1 ? shape : 1.0 - 4e-10;
shape = (2.0 * shape) / (1.0 - shape);
return processSample(inputs, outputs, (block) => {
const val = ((1 + shape) * block) / (1 + shape * Math.abs(block));
return val * postgain;
@ -84,3 +85,28 @@ class ShapeProcessor extends AudioWorkletProcessor {
}
registerProcessor('shape-processor', ShapeProcessor);
class DistortProcessor extends AudioWorkletProcessor {
static get parameterDescriptors() {
return [
{ name: 'distort', defaultValue: 0 },
{ name: 'postgain', defaultValue: 1 },
];
}
constructor() {
super();
}
process(inputs, outputs, parameters) {
let shape = parameters.distort[0];
const postgain = Math.max(0.001, Math.min(1, parameters.postgain[0]));
shape = Math.expm1(shape);
return processSample(inputs, outputs, (block) => {
const val = ((1 + shape) * block) / (1 + shape * Math.abs(block));
return val * postgain;
});
}
}
registerProcessor('distort-processor', DistortProcessor);