samplehold.h

/*
Copyright (c) 2020 Electrosmith, Corp, Paul Batchelor
 
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
 
#pragma once
#ifndef DSY_SAMPLEHOLD_H
#define DSY_SAMPLEHOLD_H
 
#include <stdint.h>
#ifdef __cplusplus
 
namespace daisysp
{
class SampleHold
{
  public:
    SampleHold() {}
    ~SampleHold() {}
 
    enum Mode
    {
        MODE_SAMPLE_HOLD,
        MODE_TRACK_HOLD,
        MODE_LAST,
    };
 
    inline float
    Process(bool trigger, float input, Mode mode = MODE_SAMPLE_HOLD)
    {
        Update(trigger, input);
        return mode == MODE_SAMPLE_HOLD ? sample_ : track_;
    }
 
  private:
    float track_    = 0;
    float sample_   = 0;
    bool  previous_ = false;
 
 
    inline void Update(bool trigger, float input)
    {
        if(trigger)
        {
            if(!previous_)
            {
                sample_ = input;
            }
            track_ = input;
        }
        previous_ = trigger;
    }
};
} // namespace daisysp
#endif
#endif