49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
#pragma once
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#include <JuceHeader.h>
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namespace serum
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{
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// ===========================================================================
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// ADSR envelope with curve tension. Durations are in seconds; the sustain
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// level is 0..1. Retriggering (noteOn while active) starts from the current
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// value for click-free legato behaviour.
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// ===========================================================================
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class Envelope
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{
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public:
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void prepare (double sampleRate) { sr = sampleRate; reset(); }
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void reset();
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void noteOn();
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void noteOff();
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void setParams (float attackSec, float decaySec, float sustain, float releaseSec, float curve);
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float process() noexcept; // advance one sample and return the value
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float getValue() const noexcept { return value; }
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bool isActive() const noexcept { return stage != Stage::Idle; }
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// Snapshot for GUI rendering.
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struct Shape { float attack = 0, decay = 0, sustain = 0, release = 0, curve = 0.5f; };
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Shape getShape() const noexcept { return shape; }
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private:
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enum class Stage { Idle, Attack, Decay, Sustain, Release };
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Stage stage = Stage::Idle;
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double sr = 44100.0;
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float value = 0.0f;
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float startValue = 0.0f, endValue = 0.0f;
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double elapsed = 0.0, duration = 0.0;
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double attackShape = 1.0, decayShape = 1.0;
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float sustain = 0.7f;
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double attackSamples = 0.0, decaySamples = 0.0, releaseSamples = 0.0;
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Shape shape;
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};
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} // namespace serum
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