/*
 * Filename:    fm_core.c
 *
 * Description:
 *
 *
 * Version:     
 * Created:     Thu Oct 31 02:06:11 2019
 * Revision:    None
 * Author:      Rachel Fae Fox (foxiepaws),fox@foxiepa.ws
 *
 */

#include "../common.h"
#include "../utils/envelope.h"
#include "fm_core.h"
#include <math.h>
#include <stdlib.h>

float core_fm_run(Operator* self, EngineState * t,float phase) {
    self->e.gate = self->gate;
    float out = 0;
    out = sin(2 * M_PI * t->t * (self->mul * self->freq) / 44100 + ((self->feedback_level > 0.0) ? self->feedback_buffer : phase));
    out *= (self->level * self->e.process(&self->e,t));
    self->feedback_buffer = out;
    return out;
}

Operator* operator_new() {
    Operator *o = malloc(sizeof(Operator));
    Envelope e = *envelope_new();
    o->level = 1.0;
    o->e = e;
    o->gate = false;
    o->feedback_level = 0.0;
    o->run = core_fm_run;
    o->feedback_buffer = 0.0;
    return o;
}