diode_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 DiodeFilter : public Processor, public SynthFilter {
    public:
      static constexpr mono_float kMinResonance = 0.7f;
 
      static constexpr mono_float kMaxResonance = 17.0f;
 
      static constexpr mono_float kMinCutoff = 1.0f;
 
      static constexpr mono_float kHighPassFrequency = 20.0f;
 
      DiodeFilter();
 
      virtual ~DiodeFilter() { }
 
      virtual Processor* clone() const override { return new DiodeFilter(*this); }
 
      virtual void process(int num_samples) override;
 
      void setupFilter(const FilterState& filter_state) override;
 
      force_inline void tick(poly_float audio_in,
                             poly_float coefficient,
                             poly_float high_pass_ratio,
                             poly_float high_pass_amount,
                             poly_float high_pass_feedback_coefficient,
                             poly_float resonance,
                             poly_float drive);
 
      void reset(poly_mask reset_mask) override;
 
      void hardReset() override;
 
      poly_float getResonance() { return resonance_; }
 
      poly_float getDrive() { return drive_; }
 
      poly_float getHighPassRatio() { return high_pass_ratio_; }
 
      poly_float getHighPassAmount() { return high_pass_amount_; }
 
    private:
      poly_float resonance_;
 
      poly_float drive_;
 
      poly_float post_multiply_;
 
      poly_float high_pass_ratio_;
 
      poly_float high_pass_amount_;
 
      poly_float feedback_high_pass_coefficient_;
 
      static force_inline poly_float saturate(poly_float value) {
        return futils::tanh(value);
      }
 
      static force_inline poly_float saturate2(poly_float value) {
        return utils::clamp(value, -1.0f, 1.0f);
      }
 
      OnePoleFilter<> high_pass_1_;  
      OnePoleFilter<> high_pass_2_;  
 
      OnePoleFilter<> high_pass_feedback_;    
      OnePoleFilter<saturate> stage1_;        
      OnePoleFilter<> stage2_;                
      OnePoleFilter<> stage3_;                
      OnePoleFilter<saturate2> stage4_;       
 
      JUCE_LEAK_DETECTOR(DiodeFilter)
  };
} // namespace vital