psyn/voice.c

#include <stdint.h>
#include <stdbool.h>
#include <math.h>
#include "osc.h"
#include "env.h"
#include "filter.h"
#include "control.h"
#include "voice.h"
#include "engine.h"
#include "psyn.h"
#include "rng.h"

static inline double max(double a, double b)
{
	return a > b ? a : b;
}

void voice_init(struct voice_t *voice, double freq)
{
	uint8_t i;
//	filter_init_rc(&voice->fil[0], 1000.0, 0.000000047);
//	filter_init_rc(&voice->fil[1], 47000.0, 0.000000047);
//	filter_init_freq(&voice->fil[0], freq);
//	filter_init_freq(&voice->fil[1], 150.0);

//	bw_filter_init_lp(&voice->bw[0], _engine.lowpass.value, 1.0);

	for (i = 0; i < VOICE_OSCILLATORS; i++) {
		voice->osc[i].shape = _engine.params[i].shape.value;
		voice->osc[i].level = _engine.params[i].level.value;

		osc_setfreq(&voice->osc[i], freq * _engine.params[i].freq_mult.value);
		osc_setphase(&voice->osc[i], _engine.params[i].phase.value);
	}
}

static inline void voice_tick(struct voice_t *voice)
{
	unsigned i;
	for (i = 0; i < VOICE_OSCILLATORS; i++) {
		osc_tick(voice->osc + i);
	}

	voice->sample++;
}

void voice_run(struct voice_t *voice, uint32_t samples, float *left, float *right)
{
//	uint32_t pos;
	int i;
	double a[VOICE_OSCILLATORS];
	double l = 0.0;
	double r = 0.0;

	//for (pos = 0; pos < samples; pos++) {
	voice_tick(voice);

	double amplitude = 0.0;
	for (i = 0; i < VOICE_OSCILLATORS; i++) {
		a[i] = env_getamplitude(&_engine.params[i].env, voice->sample, voice->released);
		amplitude += a[i];
		a[i] *= voice->velocity;
	}

	if (amplitude <= 0.0001) {
		voice->playing = false;
		return;
	}

	for (i = 0; i < VOICE_OSCILLATORS; i++) {
		float ss;
		float pl = osc_getsample(&voice->osc[i]);
		float pr = pl;
		// Mix

		switch (_engine.params[i].pan_type) {
			case PAN_FIXED:
				pl *= _engine.params[i].pan_level;
				pr *= _engine.params[i].pan_level_r;
				break;
			case PAN_OSC:
				ss = osc_getsample(&voice->osc[_engine.params[i].pan_source]) * _engine.params[i].pan_level * 0.5;
				pl *= 0.5 + ss;
				pr *= 0.5 - ss;
				break;
			case PAN_LFO:
				ss = osc_getsample(&_engine.lfo[_engine.params[i].pan_source]) * _engine.params[i].pan_level * 0.5;
				pl *= 0.5 + ss;
				pr *= 0.5 - ss;
				break;
		}

		l += a[i] * pl;
		r += a[i] * pr;
	}

	// Amplitude mod
//	l *= 1.0 + s;
//	r *= 1.0 + s;
//	l = s * (1.0 + l);
//	r = s * (1.0 + r);

	// Ring mod
//	l *= s;
//	r *= s;

//	amplitude = env_getamplitude(&_env2, voice->sample, voice->released) * voice->velocity * voice->velocity * 1.5;

//	if (amplitude > 0.0) {
//		float s1 = osc_getsample(&voice->osc[1]);
//		float s2 = osc_getsample(&voice->osc[2]);
//		l += amplitude * s1 * (1.0 + s2 * 0.25);
//		r += amplitude * s1 * (1.0 + s2 * 0.25);
//	}

//	*left += l;
//	*right += r;

	double out_l, out_r;

	double cutoff = max(env_getamplitude(&_engine.cutoff_env, voice->sample, 0), _engine.aftertouch.value) * 8000.0;
	bw_filter_init_lp(&voice->bw[0], _engine.lowpass.value + cutoff, 1.0);
	bw_filter_run(&voice->bw[0], l, r, &out_l, &out_r);
//	filter_run_lp(&voice->fil[0], l, r);
//	filter_run_hp(&voice->fil[1], voice->fil[0].last_out_l, voice->fil[0].last_out_r);

	*left += out_l;
	*right += out_r;
//	*left += voice->fil[0].last_out_l;
//	*right += voice->fil[0].last_out_r;
//	}
}