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#include "synth.h"
void voice_init(struct Voice *v, struct Synth *synth) {
v->synth = synth;
envelope_init(&v->osc_env);
envelope_init(&v->filter_env);
}
void voice_render_sample(struct Voice *v, float *out) {
float amplitude = envelope_sample(&v->osc_env); // calculate based on key velocity and envelope
float cutoff = envelope_sample(&v->filter_env);
float s = oscillator_render_sample(&v->osc);
filter_set_cutoff(&v->filter, v->synth->cutoff + cutoff * v->synth->filter_eg_intensity);
float f = filter_sample(&v->filter, v->volume * amplitude * s / 32768.0);
out[0] = (1 + v->pan) * f / 2;
out[1] = (1 - v->pan) * f / 2;
v->time++;
}
void voice_note_start(struct Voice *voice, uint8_t note, uint8_t velocity) {
voice->volume = (1+velocity) / 128.0; // in the range (0, 1]
envelope_start(&voice->osc_env);
envelope_start(&voice->filter_env);
note &= 0x7f;
voice->time = 0;
voice->note = note;
voice->osc.sub_phase = voice->osc.phase;
voice->osc.sub_oct = 1;
}
void voice_stop(struct Voice *voice) {
envelope_stop(&voice->osc_env);
envelope_stop(&voice->filter_env);
}