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use new envelope code

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master
vampirefrog 6 years ago
parent b14e155de4
commit 19f165350c
5 changed files with 49 additions and 40 deletions
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2
envelope.h
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@ -3,6 +3,8 @@
#include <stdint.h>
// Code converted to C from http://www.earlevel.com/main/2013/06/01/envelope-generators/
struct Envelope {
// private
enum {

75
synth.c
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@ -19,7 +19,7 @@ void synth_init(struct Synth *synth) {
synth->lfo_depth = 0.0;
sine_osc_init(&synth->lfo_osc);
for(int i = 0; i < SYNTH_NUM_VOICES; i++) {
synth->voices[i].synth = synth;
voice_init(&synth->voices[i], synth);
}
}
@ -35,7 +35,7 @@ static void synth_set_pitch(struct Synth *synth) {
float lfo_detune = synth->lfo_depth * sine_osc_sample(&synth->lfo_osc);
for(int i = 0; i < SYNTH_NUM_VOICES; i++) {
struct Voice *voice = &synth->voices[i];
if(voice->osc_env.state != None)
if(voice->osc_env.state != EnvNone)
oscillator_set_freq(&voice->osc, detune(midifreq(voice->note), voice->detune + synth->pitch_bend * synth->pitch_bend_range + lfo_detune));
}
}
@ -48,9 +48,9 @@ static void synth_spread_unison(struct Synth *synth) {
for(int i = 4; i < 7; i++) {
synth->voices[i].detune = (i - 7) * synth->unison_spread / 6.0;
}
for(int i = 0; i < 7; i++) {
printf("voice %d detune %f\n", i, synth->voices[i].detune);
}
// for(int i = 0; i < 7; i++) {
// printf("voice %d detune %f\n", i, synth->voices[i].detune);
// }
}
static void synth_spread_stereo(struct Synth *synth) {
@ -58,9 +58,9 @@ static void synth_spread_stereo(struct Synth *synth) {
for(int i = 1; i <= 7; i++) {
synth->voices[i].pan = ((i&1) * 2 - 1) * synth->stereo_spread * ((i + 1) / 2) / 3;
}
for(int i = 0; i < 7; i++) {
printf("voice %d pan %f\n", i, synth->voices[i].pan);
}
// for(int i = 0; i < 7; i++) {
// printf("voice %d pan %f\n", i, synth->voices[i].pan);
// }
}
static void synth_note_on_monophonic(struct Synth *synth, uint8_t note, uint8_t velocity) {
@ -71,17 +71,17 @@ static void synth_note_on_monophonic(struct Synth *synth, uint8_t note, uint8_t
struct Voice *voice = synth->voices + i;
voice->osc.phase = random();
voice->osc_env.attack = synth->osc_env.attack;
voice->osc_env.decay = synth->osc_env.decay;
voice->osc_env.sustain = synth->osc_env.sustain;
voice->osc_env.release = synth->osc_env.release;
envelope_set_attack_rate(&voice->osc_env, synth->osc_attack);
envelope_set_decay_rate(&voice->osc_env, synth->osc_decay);
envelope_set_sustain_level(&voice->osc_env, synth->osc_sustain);
envelope_set_release_rate(&voice->osc_env, synth->osc_release);
voice->filter_env.attack = synth->filter_env.attack;
voice->filter_env.decay = synth->filter_env.decay;
voice->filter_env.sustain = synth->filter_env.sustain;
voice->filter_env.release = synth->filter_env.release;
envelope_set_attack_rate(&voice->filter_env, synth->filter_attack);
envelope_set_decay_rate(&voice->filter_env, synth->filter_decay);
envelope_set_sustain_level(&voice->filter_env, synth->filter_sustain);
envelope_set_release_rate(&voice->filter_env, synth->filter_release);
voice_note_start(voice, note, i == 0 ? velocity : velocity / 4);
voice_note_start(voice, note, velocity);
}
}
@ -100,7 +100,7 @@ void synth_note_on(struct Synth *synth, uint8_t note, uint8_t velocity) {
uint32_t oldest_time = 0;
for(int i = 0; i < SYNTH_NUM_VOICES; i++) {
struct Voice *voice = &synth->voices[i];
if(voice->osc_env.state == None) {
if(voice->osc_env.state == EnvNone) {
found = voice;
break;
}
@ -109,15 +109,16 @@ void synth_note_on(struct Synth *synth, uint8_t note, uint8_t velocity) {
found = voice;
}
}
found->osc_env.attack = synth->osc_env.attack;
found->osc_env.decay = synth->osc_env.decay;
found->osc_env.sustain = synth->osc_env.sustain;
found->osc_env.release = synth->osc_env.release;
found->filter_env.attack = synth->filter_env.attack;
found->filter_env.decay = synth->filter_env.decay;
found->filter_env.sustain = synth->filter_env.sustain;
found->filter_env.release = synth->filter_env.release;
envelope_set_attack_rate(&found->osc_env, synth->osc_attack);
envelope_set_decay_rate(&found->osc_env, synth->osc_decay);
envelope_set_sustain_level(&found->osc_env, synth->osc_sustain);
envelope_set_release_rate(&found->osc_env, synth->osc_release);
envelope_set_attack_rate(&found->filter_env, synth->filter_attack);
envelope_set_decay_rate(&found->filter_env, synth->filter_decay);
envelope_set_sustain_level(&found->filter_env, synth->filter_sustain);
envelope_set_release_rate(&found->filter_env, synth->filter_release);
voice_note_start(found, note, velocity);
}
@ -141,7 +142,7 @@ void synth_note_off(struct Synth *synth, uint8_t note, uint8_t velocity) {
} else {
for(int i = 0; i < SYNTH_NUM_VOICES; i++) {
struct Voice *voice = synth->voices + i;
if(voice->note == note && voice->osc_env.state != None && voice->osc_env.state != Release) {
if(voice->note == note && voice->osc_env.state != EnvNone && voice->osc_env.state != EnvRelease) {
voice_stop(&synth->voices[i]);
}
}
@ -155,7 +156,7 @@ void synth_render_sample(struct Synth *synth, float *out) {
for(int i = 0; i < SYNTH_NUM_VOICES; i++) {
struct Voice *v = &synth->voices[i];
if(v->osc_env.state == None) continue;
if(v->osc_env.state == EnvNone) continue;
float vsmpl[2];
voice_render_sample(v, vsmpl);
@ -222,23 +223,21 @@ void synth_load_patch(struct Synth *s, const char *filename) {
if(!strcmp(tok, "lfo_freq")) {
sine_osc_set_freq(&s->lfo_osc, strtof(val, NULL));
} else if(!strcmp(tok, "osc_env.attack")) {
s->osc_env.attack = strtof(val, NULL);
s->osc_attack = strtof(val, NULL);
} else if(!strcmp(tok, "osc_env.decay")) {
s->osc_env.decay = strtof(val, NULL);
s->osc_decay = strtof(val, NULL);
} else if(!strcmp(tok, "osc_env.sustain")) {
s->osc_env.sustain = strtof(val, NULL);
s->osc_sustain = strtof(val, NULL);
} else if(!strcmp(tok, "osc_env.release")) {
s->osc_env.release = strtof(val, NULL);
s->osc_release = strtof(val, NULL);
} else if(!strcmp(tok, "filter_env.attack")) {
printf("filter_env.attack %f\n", strtof(val, NULL));
s->filter_env.attack = strtof(val, NULL);
s->filter_attack = strtof(val, NULL);
} else if(!strcmp(tok, "filter_env.decay")) {
printf("filter_env.decay %f\n", strtof(val, NULL));
s->filter_env.decay = strtof(val, NULL);
s->filter_decay = strtof(val, NULL);
} else if(!strcmp(tok, "filter_env.sustain")) {
s->filter_env.sustain = strtof(val, NULL);
s->filter_sustain = strtof(val, NULL);
} else if(!strcmp(tok, "filter_env.release")) {
s->filter_env.release = strtof(val, NULL);
s->filter_release = strtof(val, NULL);
} else if(!strcmp(tok, "filter_eg_intensity")) {
s->filter_eg_intensity = strtof(val, NULL);
} else if(!strcmp(tok, "filter_kbd_track")) {

5
synth.h
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@ -19,7 +19,8 @@ struct Key {
struct Synth {
struct Voice voices[SYNTH_NUM_VOICES];
struct Envelope osc_env, filter_env;
float osc_attack, osc_decay, osc_sustain, osc_release;
float filter_attack, filter_decay, filter_sustain, filter_release;
float unison_spread;
float stereo_spread;
uint8_t monophonic;
@ -29,8 +30,8 @@ struct Synth {
float cutoff, filter_eg_intensity, filter_kbd_track, lfo_freq;
// private
struct Key key_stack[SYNTH_NUM_VOICES];
struct SineOsc lfo_osc;
struct Key key_stack[SYNTH_NUM_VOICES];
uint8_t key_stack_size;
float volume, pitch_bend, lfo_depth;
uint32_t time;

6
voice.c
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@ -1,5 +1,11 @@
#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) {
//if(v->osc_env.state == None) return;
float amplitude = envelope_sample(&v->osc_env); // calculate based on key velocity and envelope

1
voice.h
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@ -21,6 +21,7 @@ struct Voice {
struct Filter filter;
};
void voice_init(struct Voice *voice, struct Synth *synth);
void voice_note_start(struct Voice *voice, uint8_t note, uint8_t velocity);
void voice_stop(struct Voice *voice);
void voice_render_sample(struct Voice *voice, float *out);

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