add voice functions
This commit is contained in:
178
synth/triplex.h
178
synth/triplex.h
@@ -1,4 +1,6 @@
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#pragma once
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#include "audio_math.h"
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#include "synth.h"
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#include <cmath>
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#include <random>
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@@ -137,7 +139,8 @@ inline float tx_lerp(float x1, float y1, float x2, float y2, float x)
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return y1 + (((x - x1) * (y2 - y1)) / (x2 - x1));
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}
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inline float tx_enveloope_process_sample(tx_envelope& e, bool gate, bool trigger, float _attack_mod, float _decay_mod)
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inline float tx_envelope_process_sample(tx_envelope& e, bool gate, bool trigger, float _attack_mod = 0,
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float _decay_mod = 0)
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{
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size_t attack_mid_x1 = tx_mtos(e.attack1_rate + (float)_attack_mod, e.samplerate);
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size_t attack_mid_x2 = tx_mtos(e.attack2_rate + (float)_attack_mod, e.samplerate);
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@@ -279,8 +282,177 @@ inline float tx_enveloope_process_sample(tx_envelope& e, bool gate, bool trigger
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struct tx_operator {
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tx_envelope envelope;
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tx_sineosc oscillator;
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float ratio;
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float amplitude;
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float ratio = 1.f;
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float amplitude = 1.f;
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};
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inline void tx_operator_init(tx_operator& op, double samplerate)
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{
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tx_envelope_init(op.envelope, samplerate);
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tx_sineosc_init(op.oscillator, samplerate);
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}
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inline float tx_operator_process_sample(tx_operator& op, bool gate, bool trigger, float frequency, float velocity,
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float pm = 0.f)
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{
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float env = tx_envelope_process_sample(op.envelope, gate, trigger);
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// drifts and sounds better!
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if (op.envelope.state != idle) {
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float osc = tx_sineosc_process_sample(op.oscillator, trigger, frequency, pm);
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return osc * env * velocity;
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} else {
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return 0.f;
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}
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}
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////////////
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// VOICE //
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////////////
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constexpr float MOD_INDEX_COEFF = 4.f;
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struct tx_voice {
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bool gate = false;
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bool trigger = false;
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int midi_note = 0;
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float velocity = 1.f;
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float additional_pitch_mod = 0.f; // modulates pitch in frequency
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int algorithm = 0;
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float pitch_env_amt = 0.f;
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float feedback_amt = 0.f;
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float bit_resolution = 12.f;
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tx_sineosc feedback_osc;
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tx_envelope pitch_env;
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tx_operator op1;
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tx_operator op2;
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tx_operator op3;
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float pitch_mod = 0.f;
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};
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inline float calc_algo1(tx_voice& v, const float frequency)
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{
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float fb_freq = frequency * v.op3.ratio;
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float fb_mod_index = (v.feedback_amt * MOD_INDEX_COEFF);
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float fb_signal = tx_sineosc_process_sample(v.feedback_osc, v.trigger, fb_freq) * fb_mod_index;
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float op3_Freq = frequency * v.op3.ratio;
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float op3_mod_index = (v.op3.amplitude * MOD_INDEX_COEFF);
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float op3_signal =
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tx_operator_process_sample(v.op3, v.gate, v.trigger, op3_Freq, v.velocity, fb_signal) * op3_mod_index;
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float op2_freq = frequency * v.op2.ratio;
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float op2_mod_index = (v.op2.amplitude * MOD_INDEX_COEFF);
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float op2_signal =
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tx_operator_process_sample(v.op2, v.gate, v.trigger, op2_freq, v.velocity, op3_signal) * op2_mod_index;
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float op1_freq = frequency * v.op1.ratio;
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return tx_operator_process_sample(v.op1, v.gate, v.trigger, op1_freq, v.velocity, op2_signal) * v.op1.amplitude;
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}
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inline float calc_algo2(tx_voice& v, const float frequency)
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{
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float fb_freq = frequency * v.op3.ratio;
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float fb_mod_index = (v.feedback_amt * MOD_INDEX_COEFF);
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float fb_signal = tx_sineosc_process_sample(v.feedback_osc, v.trigger, fb_freq) * fb_mod_index;
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float op3_freq = frequency * v.op3.ratio;
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float op3_signal =
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tx_operator_process_sample(v.op3, v.gate, v.trigger, op3_freq, v.velocity, fb_signal) * v.op3.amplitude;
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float op2_freq = frequency * v.op2.ratio;
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float op2_mod_index = (v.op2.amplitude * MOD_INDEX_COEFF);
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float op2_signal = tx_operator_process_sample(v.op2, v.gate, v.trigger, op2_freq, v.velocity) * op2_mod_index;
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float op1_freq = frequency * v.op1.ratio;
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float op1_signal =
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tx_operator_process_sample(v.op1, v.gate, v.trigger, op1_freq, v.velocity, op2_signal) * v.op1.amplitude;
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return op1_signal + op3_signal;
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}
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inline float calc_algo3(tx_voice& v, const float frequency)
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{
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float fb_freq = frequency * v.op3.ratio;
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float fb_mod_index = (v.feedback_amt * MOD_INDEX_COEFF);
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float fb_signal = tx_sineosc_process_sample(v.feedback_osc, v.trigger, fb_freq) * fb_mod_index;
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float op3_freq = frequency * v.op3.ratio;
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float op3_signal =
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tx_operator_process_sample(v.op3, v.gate, v.trigger, op3_freq, v.velocity, fb_signal) * v.op3.amplitude;
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float op2_freq = frequency * v.op2.ratio;
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float op2_signal = tx_operator_process_sample(v.op2, v.gate, v.trigger, op2_freq, v.velocity) * v.op2.amplitude;
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float op1_freq = frequency * v.op1.ratio;
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float op1_signal = tx_operator_process_sample(v.op1, v.gate, v.trigger, op1_freq, v.velocity) * v.op1.amplitude;
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return op1_signal + op2_signal + op3_signal;
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}
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inline float calc_algo4(tx_voice& v, const float frequency)
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{
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float fb_freq = frequency * v.op3.ratio;
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float fb_mod_index = (v.feedback_amt * MOD_INDEX_COEFF);
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float fb_signal = tx_sineosc_process_sample(v.feedback_osc, v.trigger, fb_freq) * fb_mod_index;
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float op3_freq = frequency * v.op3.ratio;
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float op3_mod_index = (v.op3.amplitude * MOD_INDEX_COEFF);
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float op3_signal =
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tx_operator_process_sample(v.op3, v.gate, v.trigger, op3_freq, v.velocity, fb_signal) * op3_mod_index;
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float op2_freq = frequency * v.op2.ratio;
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float op2_mod_index = (v.op2.amplitude * MOD_INDEX_COEFF);
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float op2_signal = tx_operator_process_sample(v.op2, v.gate, v.trigger, op2_freq, v.velocity) * op2_mod_index;
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float op1_freq = frequency * v.op1.ratio;
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return tx_operator_process_sample(v.op1, v.gate, v.trigger, op1_freq, v.velocity, op2_signal + op3_signal) *
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v.op1.amplitude;
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}
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template <>
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inline void voice_process_block<tx_voice, float>(tx_voice& v, float** frames, size_t num_frames, midi_event* events,
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size_t num_events, const vector<audio_buffer<float>>& mods)
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{
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float frequency = midi_to_frequency(v.midi_note + v.pitch_mod + v.additional_pitch_mod);
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for (int s = 0; s < num_frames; s++) {
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float pitch_env_signal = tx_envelope_process_sample(v.pitch_env, v.gate, v.trigger) * v.pitch_env_amt;
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float pitched_freq = frequency + pitch_env_signal;
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float output = 0.f;
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// mix operator signals according to selected algorithm
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switch (v.algorithm) {
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case 0:
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output = calc_algo1(v, pitched_freq);
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break;
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case 1:
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output = calc_algo2(v, pitched_freq);
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break;
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case 2:
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output = calc_algo3(v, pitched_freq);
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break;
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case 3:
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output = calc_algo4(v, pitched_freq);
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break;
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default:
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output = calc_algo1(v, pitched_freq);
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break;
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}
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// reset trigger
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v.trigger = false;
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float res = powf(2, v.bit_resolution);
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output = roundf(output * res) / res;
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frames[0][s] += output / 3.;
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frames[1][s] = frames[0][s];
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}
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}
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} // namespace trnr
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