dirty_filter.h

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#pragma once
 
#include "processor.h"
#include "synth_filter.h"
 
#include "futils.h"
#include "one_pole_filter.h"
 
namespace vital {
 
    class DirtyFilter : public Processor, public SynthFilter {
    public:
        static constexpr mono_float kMinResonance = 0.1f;
        static constexpr mono_float kMaxResonance = 2.15f;
        static constexpr mono_float kSaturationBoost = 1.4f;
        static constexpr mono_float kMaxVisibleResonance = 2.0f;
        static constexpr mono_float kDriveResonanceBoost = 0.05f;
 
        static constexpr mono_float kMinCutoff = 1.0f;
        static constexpr mono_float kMinDrive = 0.1f;
 
        static constexpr mono_float kFlatResonance = 1.0f;
 
        force_inline poly_float tuneResonance(poly_float resonance, poly_float coefficient) {
            return resonance / utils::max(1.0f, coefficient * 0.25f + 0.97f);
        }
 
        DirtyFilter();
        virtual ~DirtyFilter() { }
 
        Processor* clone() const override { return new DirtyFilter(*this); }
 
        virtual void process(int num_samples) override;
 
        void setupFilter(const FilterState& filter_state) override;
 
        void process12(int num_samples, poly_float current_resonance,
                       poly_float current_drive, poly_float current_drive_boost, poly_float current_drive_blend,
                       poly_float current_low, poly_float current_band, poly_float current_high);
 
        void process24(int num_samples, poly_float current_resonance,
                       poly_float current_drive, poly_float current_drive_boost, poly_float current_drive_blend,
                       poly_float current_low, poly_float current_band, poly_float current_high);
 
        void processDual(int num_samples, poly_float current_resonance,
                         poly_float current_drive, poly_float current_drive_boost,
                         poly_float current_drive_blend, poly_float current_drive_mult,
                         poly_float current_low, poly_float current_high);
 
        force_inline poly_float tick24(poly_float audio_in,
                                       poly_float coefficient, poly_float resonance,
                                       poly_float drive, poly_float feed_mult, poly_float normalizer,
                                       poly_float pre_feedback_mult, poly_float pre_normalizer,
                                       poly_float low, poly_float band, poly_float high);
 
        force_inline poly_float tickDual(poly_float audio_in,
                                         poly_float coefficient, poly_float resonance,
                                         poly_float drive, poly_float feed_mult, poly_float normalizer,
                                         poly_float pre_feedback_mult, poly_float pre_normalizer,
                                         poly_float low, poly_float high);
 
        force_inline poly_float tick(poly_float audio_in,
                                     poly_float coefficient, poly_float resonance,
                                     poly_float drive, poly_float feed_mult, poly_float normalizer,
                                     poly_float low, poly_float band, poly_float high);
 
        void reset(poly_mask reset_mask) override;
 
        void hardReset() override;
 
        force_inline poly_float getResonance() {
            poly_float resonance_in = utils::clamp(tuneResonance(resonance_, coefficient_ * 2.0f), 0.0f, 1.0f);
            return utils::interpolate(kMinResonance, kMaxResonance, resonance_in) + drive_boost_;
        }
 
        force_inline poly_float getDrive() {
            poly_float resonance = getResonance();
            poly_float scaled_drive = utils::max(poly_float(kMinDrive), drive_) / (resonance * resonance * 0.5f + 1.0f);
            return utils::interpolate(drive_, scaled_drive, drive_blend_);
        }
 
        force_inline poly_float getLowAmount() { return low_pass_amount_; }
 
        force_inline poly_float getBandAmount() { return band_pass_amount_; }
 
        force_inline poly_float getHighAmount() { return high_pass_amount_; }
 
        force_inline poly_float getLowAmount24(int style) {
            if (style == kDualNotchBand)
                return high_pass_amount_;
            return low_pass_amount_;
        }
 
        force_inline poly_float getHighAmount24(int style) {
            if (style == kDualNotchBand)
                return low_pass_amount_;
            return high_pass_amount_;
        }
 
    private:
        poly_float coefficient_, resonance_;
        poly_float drive_, drive_boost_, drive_blend_, drive_mult_;
 
        poly_float low_pass_amount_;
        poly_float band_pass_amount_;
        poly_float high_pass_amount_;
 
        OnePoleFilter<> pre_stage1_;
        OnePoleFilter<> pre_stage2_;
        OnePoleFilter<> stage1_;
        OnePoleFilter<> stage2_;
        OnePoleFilter<futils::quickTanh> stage3_;
        OnePoleFilter<futils::quickTanh> stage4_;
 
        JUCE_LEAK_DETECTOR(DirtyFilter)
    };
} // namespace vital