91 lines
2.1 KiB
C++
91 lines
2.1 KiB
C++
/*
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==============================================================================
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shifter_voice.cpp
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Created: 25 Oct 2025 2:09:42pm
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Author: mickl
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==============================================================================
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*/
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#include "shifter_voice.h"
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static inline float mtof(float m)
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{
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return powf(2, (m - 69.0f) / 12.0f) * 440.0f;
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}
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void ShifterVoice::Init(float sample_rate) {
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portamento_.Init(sample_rate, 0.05f); //default portamento time
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amplitude_envelope_.Init(sample_rate);
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amplitude_envelope_.SetAttackTime(0.2f);
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amplitude_envelope_.SetDecayTime(0.2f);
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amplitude_envelope_.SetReleaseTime(1.0f);
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onoff_ = false;
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overflow_ = false;
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current_midi = 60;
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current_period_ = 48000.0f / mtof((float)current_midi);
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current_amplitude = 0.0f;
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period_counter = 0.0f;
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panning = 0.5f;
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}
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bool ShifterVoice::IsActive() { return amplitude_envelope_.IsRunning(); }
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void ShifterVoice::Trigger(int midi_note) {
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current_midi = midi_note;
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// Retrigger envelope
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amplitude_envelope_.Retrigger(false);
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onoff_ = true;
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panning = rand() / (float)RAND_MAX;
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}
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void ShifterVoice::Release() {
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onoff_ = false;
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}
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void ShifterVoice::Process() {
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current_amplitude = amplitude_envelope_.Process(onoff_);
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current_period_ = 48000.0f / mtof(portamento_.Process((float)current_midi));
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period_counter++;
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overflow_ = period_counter >= current_period_;
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if (overflow_) {
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period_counter -= current_period_;
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}
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}
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float ShifterVoice::CurrentAmplitude() {
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return current_amplitude;
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}
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float ShifterVoice::CurrentPeriod() {
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return current_period_;
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}
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bool ShifterVoice::PeriodOverflow() {
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return overflow_;
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}
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void ShifterVoice::SetPortamentoTime(float time) {
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portamento_.SetHtime(time);
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}
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void ShifterVoice::SetAdsrTimes(float attack, float decay, float release) {
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amplitude_envelope_.SetAttackTime(attack);
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amplitude_envelope_.SetDecayTime(decay);
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amplitude_envelope_.SetReleaseTime(release);
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amplitude_envelope_.SetSustainLevel(1.0);
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}
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float ShifterVoice::GetPanning(int channel) const {
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switch (channel) {
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default:
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case 0:
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return panning < .5 ? 1.0 : 2.0f - (panning * 2.0f);
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case 1:
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return panning > .5 ? 1.0 : panning * 2.0f;
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}
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} |