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refactor(filter): cache coefficients and extract cutoff calculation

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Add updateCoefficients() that short-circuits when cutoff, resonance,
and type are unchanged. Cache ladderG and formantCoefficients so
processSample() avoids redundant exp()/tan() calls per sample.

Extract static getCutoffHz() from Filter::process() so FilterBank
can compute the keytracked cutoff once per parallel branch instead
of per sample. Simplify formant() and screamer() signatures to use
cached state.
This commit is contained in:
biggy
2026-09-09 14:32:49 +02:00
parent 3b2ecc50f2
commit dc6fd88ed1
3 changed files with 90 additions and 35 deletions
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Source/FilterBank.cpp
+6 -4
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@@ -39,6 +39,8 @@ void FilterBank::process (float* l, float* r, int numSamples, const FilterBankPa
else if (p.route == (int) FilterRoute::Parallel)
{
// Run both filters on copies and crossfade.
const float cutoff1 = p.f1On ? Filter::getCutoffHz (p.f1Cutoff, p.f1Key, noteHz) : 0.0f;
const float cutoff2 = p.f2On ? Filter::getCutoffHz (p.f2Cutoff, p.f2Key, noteHz) : 0.0f;
float f1l = 0.0f, f1r = 0.0f, f2l = 0.0f, f2r = 0.0f;
for (int i = 0; i < numSamples; ++i)
{
@@ -46,13 +48,13 @@ void FilterBank::process (float* l, float* r, int numSamples, const FilterBankPa
f2l = l[i]; f2r = r[i];
if (p.f1On)
{
f1l = f1L.processSample (f1l, maps::cutoffToHz (p.f1Cutoff), p.f1Res, p.f1Drive, p.f1Type, p.f1Slope);
f1r = f1R.processSample (f1r, maps::cutoffToHz (p.f1Cutoff), p.f1Res, p.f1Drive, p.f1Type, p.f1Slope);
f1l = f1L.processSample (f1l, cutoff1, p.f1Res, p.f1Drive, p.f1Type, p.f1Slope);
f1r = f1R.processSample (f1r, cutoff1, p.f1Res, p.f1Drive, p.f1Type, p.f1Slope);
}
if (p.f2On)
{
f2l = f2L.processSample (f2l, maps::cutoffToHz (p.f2Cutoff), p.f2Res, p.f2Drive, p.f2Type, p.f2Slope);
f2r = f2R.processSample (f2r, maps::cutoffToHz (p.f2Cutoff), p.f2Res, p.f2Drive, p.f2Type, p.f2Slope);
f2l = f2L.processSample (f2l, cutoff2, p.f2Res, p.f2Drive, p.f2Type, p.f2Slope);
f2r = f2R.processSample (f2r, cutoff2, p.f2Res, p.f2Drive, p.f2Type, p.f2Slope);
}
const float m = p.mix;
l[i] = f1l * (1.0f - m) + f2l * m;