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93 lines
2.9 KiB
93 lines
2.9 KiB
4 years ago
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#pragma once
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#ifndef ADENV_H
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#define ADENV_H
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#include <stdint.h>
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#ifdef __cplusplus
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namespace daisysp
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{
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/** Distinct stages that the phase of the envelope can be located in.
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@see AdEnv
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*/
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enum AdEnvSegment
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{
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/** located at phase location 0, and not currently running */
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ADENV_SEG_IDLE,
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/** First segment of envelope where phase moves from MIN value to MAX value */
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ADENV_SEG_ATTACK,
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/** Second segment of envelope where phase moves from MAX to MIN value */
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ADENV_SEG_DECAY,
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/** The final segment of the envelope (currently decay) */
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ADENV_SEG_LAST,
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};
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/** Trigger-able envelope with adjustable min/max, and independent per-segment time control.
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\author shensley
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\todo - Add Cycling
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\todo - Implement Curve (its only linear for now).
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\todo - Maybe make this an ADsr_ that has AD/AR/Asr_ modes.
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*/
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class AdEnv
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{
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public:
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AdEnv() {}
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~AdEnv() {}
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/** Initializes the ad envelope.
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Defaults:
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- current segment = idle
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- curve = linear
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- phase = 0
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- min = 0
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- max = 1
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\param sample_rate sample rate of the audio engine being run
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*/
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void Init(float sample_rate);
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/** Processes the current sample of the envelope. This should be called once
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per sample period.
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\return the current envelope value.
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*/
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float Process();
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/** Starts or retriggers the envelope.*/
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inline void Trigger() { trigger_ = 1; }
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/** Sets the length of time (in seconds) for a specific segment. */
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inline void SetTime(uint8_t seg, float time) { segment_time_[seg] = time; }
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/** Sets the amount of curve applied. A positve value will create a log
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curve. Input range: -100 to 100. (or more)
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*/
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inline void SetCurve(float scalar) { curve_scalar_ = scalar; }
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/** Sets the minimum value of the envelope output.
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Input range: -FLTmax_, to FLTmax_
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*/
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inline void SetMin(float min) { min_ = min; }
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/** Sets the maximum value of the envelope output.
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Input range: -FLTmax_, to FLTmax_
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*/
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inline void SetMax(float max) { max_ = max; }
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/** Returns the current output value without processing the next sample */
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inline float GetValue() const { return (output_ * (max_ - min_)) + min_; }
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/** Returns the segment of the envelope that the phase is currently located
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in.
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*/
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inline uint8_t GetCurrentSegment() { return current_segment_; }
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/** Returns true if the envelope is currently in any stage apart from idle.
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*/
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inline bool IsRunning() const { return current_segment_ != ADENV_SEG_IDLE; }
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private:
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uint8_t current_segment_, prev_segment_;
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float segment_time_[ADENV_SEG_LAST];
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float sample_rate_, min_, max_, output_, curve_scalar_;
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float c_inc_, curve_x_, retrig_val_;
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uint32_t phase_;
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uint8_t trigger_;
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};
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} // namespace daisysp
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#endif
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#endif
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