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91 lines
2.5 KiB
91 lines
2.5 KiB
4 years ago
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#pragma once
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#ifndef DSY_POLYPLUCK_H
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#define DSY_POLYPLUCK_H
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#include <stdlib.h>
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#include "Utility/dsp.h"
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#include "PhysicalModeling/pluck.h"
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#include "Utility/dcblock.h"
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namespace daisysp
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{
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/** Simplified Pseudo-Polyphonic Pluck Voice
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Template Based Pluck Voice, with configurable number of voices and simple pseudo-polyphony.
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DC Blocking included to prevent biases from causing unwanted saturation distortion.
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**Author**: shensley
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**Date Added**: March 2020
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*/
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template <size_t num_voices>
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class PolyPluck
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{
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public:
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/** Initializes the PolyPluck instance.
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\param sample_rate: rate in Hz that the Process() function will be called.
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*/
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void Init(float sample_rate)
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{
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active_voice_ = 0;
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p_damp_ = 0.95f;
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p_decay_ = 0.75f;
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for(size_t i = 0; i < num_voices; i++)
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{
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plk_[i].Init(sample_rate, plkbuff_[i], 256, PLUCK_MODE_RECURSIVE);
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plk_[i].SetDamp(0.85f);
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plk_[i].SetAmp(0.18f);
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plk_[i].SetDecay(0.85f);
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}
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blk_.Init(sample_rate);
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}
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/** Process function, synthesizes and sums the output of all voices,
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triggering a new voice with frequency of MIDI note number when trig > 0.
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\param trig: value by reference of trig. When trig > 0 a the next voice will be triggered, and trig will be set to 0.
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\param note: MIDI note number for the active_voice.
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*/
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float Process(float &trig, float note)
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{
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float sig, tval;
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sig = 0.0f;
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if(trig > 0.0f)
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{
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// increment active voice
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active_voice_ = (active_voice_ + 1) % num_voices;
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// set new voice to new note
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plk_[active_voice_].SetDamp(p_damp_);
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plk_[active_voice_].SetDecay(p_decay_);
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plk_[active_voice_].SetAmp(0.25f);
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}
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plk_[active_voice_].SetFreq(mtof(note));
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for(size_t i = 0; i < num_voices; i++)
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{
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tval = (trig > 0.0f && i == active_voice_) ? 1.0f : 0.0f;
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sig += plk_[i].Process(tval);
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}
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if(trig > 0.0f)
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trig = 0.0f;
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return blk_.Process(sig);
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}
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/** Sets the decay coefficients of the pluck voices.
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\param p expects 0.0-1.0 input.
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*/
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void SetDecay(float p) { p_damp_ = p; }
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private:
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DcBlock blk_;
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Pluck plk_[num_voices];
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float plkbuff_[num_voices][256];
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float p_damp_, p_decay_;
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size_t active_voice_;
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};
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} // namespace daisysp
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#endif
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