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Aria 2025-10-09 18:28:59 -05:00
parent cbcb25b063
commit a3b803c3f3
7 changed files with 271 additions and 98 deletions
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71
packages/superdough/helpers.mjs
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@ -153,6 +153,24 @@ export const getADSRValues = (params, curve = 'linear', defaultValues) => {
return [Math.max(a ?? 0, envmin), Math.max(d ?? 0, envmin), Math.min(sustain, envmax), Math.max(r ?? 0, releaseMin)];
};
export function getParamLfo(audioContext, param, start, end, lfoValues) {
let { defaultDepth = 1, depth, dcoffset, ...getLfoInputs } = lfoValues;
if (depth == null) {
const hasLFOParams = Object.values(getLfoInputs).some((v) => v != null);
depth = hasLFOParams ? defaultDepth : 0;
}
let lfo;
if (depth) {
lfo = getLfo(audioContext, start, end, {
depth,
dcoffset,
...getLfoInputs,
});
lfo.connect(param);
}
return lfo;
}
// helper utility for applying standard modulators to a parameter
export function applyParameterModulators(audioContext, param, start, end, envelopeValues, lfoValues) {
let { amount, offset, defaultAmount = 1, curve = 'linear', values, holdEnd, defaultValues } = envelopeValues;
@ -169,41 +187,39 @@ export function applyParameterModulators(audioContext, param, start, end, envelo
const [attack, decay, sustain, release] = getADSRValues(values, curve, defaultValues);
getParamADSR(param, attack, decay, sustain, release, min, max, start, holdEnd, curve);
}
let lfo;
let { defaultDepth = 1, depth, dcoffset, ...getLfoInputs } = lfoValues;
if (depth == null) {
const hasLFOParams = Object.values(getLfoInputs).some((v) => v != null);
depth = hasLFOParams ? defaultDepth : 0;
}
if (depth) {
lfo = getLfo(audioContext, start, end, {
depth,
dcoffset,
...getLfoInputs,
});
lfo.connect(param);
}
const lfo = getParamLfo(audioContext, param, start, end, lfoValues);
return { lfo, disconnect: () => lfo?.disconnect() };
}
export function createFilter(context, type, frequency, Q, att, dec, sus, rel, fenv, start, end, fanchor, model, drive) {
const curve = 'exponential';
const [attack, decay, sustain, release] = getADSRValues([att, dec, sus, rel], curve, [0.005, 0.14, 0, 0.1]);
let filter;
export function createFilter(context, start, end, params, cps) {
let {
frequency,
fanchor,
fenv,
type,
model,
q = 1,
drive = 0.69,
depth,
dcoffset = -0.5,
skew,
shape,
rate,
sync,
} = params;
let frequencyParam;
if (model === 'ladder') {
filter = getWorklet(context, 'ladder-processor', { frequency, q: Q, drive });
filter = getWorklet(context, 'ladder-processor', { frequency, q, drive });
frequencyParam = filter.parameters.get('frequency');
} else {
filter = context.createBiquadFilter();
filter.type = type;
filter.Q.value = Q;
filter.Q.value = q;
filter.frequency.value = frequency;
frequencyParam = filter.frequency;
}
const envelopeValues = [params.attack, params.decay, params.sustain, params.release];
const [attack, decay, sustain, release] = getADSRValues(envelopeValues, 'exponential', [0.005, 0.14, 0, 0.1]);
// envelope is active when any of these values is set
const hasEnvelope = att ?? dec ?? sus ?? rel ?? fenv;
// Apply ADSR to filter frequency
@ -216,8 +232,15 @@ export function createFilter(context, type, frequency, Q, att, dec, sus, rel, fe
let max = clamp(2 ** (fenvAbs - offset) * frequency, 0, 20000);
if (fenv < 0) [min, max] = [max, min];
getParamADSR(frequencyParam, attack, decay, sustain, release, min, max, start, end, curve);
return filter;
}
if (sync != null) {
rate = cps * sync;
}
const lfoValues = { depth, dcoffset, skew, shape, frequency: rate };
getParamLfo(context, frequencyParam, start, end, lfoValues);
// TODO: remember to disconnect LFO
// lfo?.disconnect()
return filter;
}