57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
#pragma once
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#include <JuceHeader.h>
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#include "Params.h"
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namespace serum
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{
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// ===========================================================================
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// Mono filter with 7 models (Ladder LP/HP/BP, Diode, Comb, Formant, Screamer),
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// 6/12/24 dB slopes (ladder family) and per-sample drive + keytrack. All state
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// is clamped to prevent NaN/inf at extreme settings.
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// ===========================================================================
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class Filter
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{
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public:
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void prepare (double sampleRate, int maxBlockSize);
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void reset();
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// Process a mono buffer in-place. cutoffNorm is 0..1 (mapped to 20Hz..20kHz).
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void process (float* samples, int numSamples, float cutoffNorm, float res,
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float drive, float keytrack, float noteHz, int type, int slope) noexcept;
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// Single-sample version (used by the comb/naive paths where convenient).
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float processSample (float in, float cutoffHz, float res, float drive, int type, int slope) noexcept;
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private:
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double sr = 44100.0;
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// TPT SVF state (also reused by formant/screamer).
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double ic1eq = 0.0, ic2eq = 0.0;
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double lastG = 0.0, lastK = 0.0;
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double a1 = 0.0, a2 = 0.0, a3 = 0.0;
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// Ladder stage state.
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std::array<double, 4> stage { { 0.0, 0.0, 0.0, 0.0 } };
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// Comb delay line.
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std::vector<float> combLine;
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int combWrite = 0;
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double combDamp = 0.0;
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// Formant: three parallel bandpass SVFs (state pairs).
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std::array<std::array<double, 2>, 3> formantState { { { { 0.0, 0.0 } }, { { 0.0, 0.0 } }, { { 0.0, 0.0 } } } };
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void updateSvf (double g, double k) noexcept;
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double svfLow (double in, double g, double k) noexcept;
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double svfBand (double in, double g, double k) noexcept;
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double svfHigh (double in, double g, double k) noexcept;
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double ladder (double in, double g, double res, double drive, int stages, bool diode) noexcept;
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double comb (double in, double freqHz, double res, double drive) noexcept;
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double formant (double in, double morph, double res) noexcept;
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double screamer (double in, double cutoffHz, double res, double drive) noexcept;
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};
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} // namespace serum
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