feat: synth operations through single object

main.c

@@ -16,6 +16,12 @@
 // Synth
 //------------------------------------------------------------------------------------
 
+typedef struct Synth {
+    OscillatorArray oscillators;
+    Note current_note;
+    SynthSound* out_signal;
+} Synth;
+
 static int get_semitone_shift_internal(char* root_note, char* target_note) {
     char* pitch_classes[12] =
         { "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B" };
@@ -68,38 +74,39 @@ int get_semitone_shift(char* target_note) {
     return get_semitone_shift_internal("A4", target_note);
 }
 
-SynthSound note(int semitone, float beats) {
-    float hz = get_hz_by_semitone(semitone);
-    float duration = beats * BEAT_DURATION;
-
+static OscillatorArray init_osc_array() {
     Oscillator first = {
         .osc = Square,
-        .freq = hz
+        .freq = 440.f
     };
 
-    Oscillator second = {
-        .osc = Saw,
-        .freq = hz + 0.5
-    };
+    Oscillator* oscArray = malloc(sizeof(Oscillator*) * 1);
+    oscArray[0] = first;
 
-    Oscillator third = {
-        .osc = Saw,
-        .freq = hz - 1.f
-    };
-
-    Oscillator oscArray[] = { first/*, second, third */};
-    OscillatorArray parameters = {
+    OscillatorArray oscillators = {
         .array = oscArray,
         .count = 1
     };
 
-    return freq(duration, parameters);
+    return oscillators;
 }
 
-SynthSound get_note_sound(Note input) {
+SynthSound note(Synth* synth, int semitone, float beats) {
+    float hz = get_hz_by_semitone(semitone);
+    float duration = beats * BEAT_DURATION;
+    
+    // will change after oscillator starts to be more autonomous
+    for (size_t i = 0; i < synth->oscillators.count; i++) {
+        synth->oscillators.array[i].freq = hz;
+    }
+
+    return freq(duration, synth->oscillators);
+}
+
+SynthSound get_note_sound(Synth* synth, Note input) {
     float length = 1.f / input.length;
     int semitone_shift = get_semitone_shift(input.name);
-    return note(semitone_shift, length);
+    return note(synth, semitone_shift, length);
 }
 //-------------------------------------------------------
 
@@ -137,12 +144,6 @@ size_t detect_note_pressed(Note* note) {
     return is_pressed;
 }
 
-typedef struct Synth {
-    OscillatorArray oscillators;
-    Note current_note;
-    SynthSound out_signal;
-} Synth;
-
 //------------------------------------------------------------------------------------
 // Main
 //------------------------------------------------------------------------------------
@@ -151,14 +152,22 @@ int main(int argc, char **argv) {
     InitWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "SeeSynth - v0.1");
     SetTargetFPS(60);
 
-    Note current_note = {
+    //todo: move that variables to Synth declaration
+    Note g_current_note = {
         .length = 1,
         .name = malloc(sizeof(char) * 3)
     };
 
-    SynthSound sound = {
+    SynthSound g_sound = {
         .sample_count = 0
     };
+
+    Synth synth = {
+        .current_note = g_current_note,
+        .out_signal = &g_sound,
+        .oscillators = init_osc_array()
+    };
+
     int sound_played_count = 0;
     float temp_buffer[STREAM_BUFFER_SIZE];
     RingBuffer ring_buffer = ring_buffer_init(STREAM_BUFFER_SIZE);
@@ -178,25 +187,26 @@ int main(int argc, char **argv) {
         // Update Audio states
         //----------------------------------------------------------------------------------
         // Fill ring buffer from current sound
+        SynthSound* sound = synth.out_signal;
         size_t size_for_buffer = 0;
-        if (!ring_buffer.is_full && sound.sample_count != sound_played_count) {
+        if (!ring_buffer.is_full && sound->sample_count != sound_played_count) {
             write_log("[INFO] IsFull:%d Samples:%zu Played:%zu\n", 
                 ring_buffer.is_full, 
-                sound.sample_count, 
+                sound->sample_count, 
                 sound_played_count);
             
             // how many samples need write
             size_t size_to_fill = 0;
             
-            if ((sound.sample_count - sound_played_count) > ring_buffer.size) {
+            if ((sound->sample_count - sound_played_count) > ring_buffer.size) {
                 size_to_fill = ring_buffer.size;
             } else {
-                size_to_fill = sound.sample_count - sound_played_count;
+                size_to_fill = sound->sample_count - sound_played_count;
             }
 
             write_log("[INFO] SizeToFill:%zu\n", size_to_fill);
             for (size_t i = 0; i < size_to_fill; i++) {
-                temp_buffer[i] = sound.samples[i];
+                temp_buffer[i] = sound->samples[i];
             }
             
             ring_buffer_write(&ring_buffer, temp_buffer, size_to_fill);
@@ -213,7 +223,7 @@ int main(int argc, char **argv) {
                 // can try the SetAudioStreamCallback
                 UpdateAudioStream(synth_stream, temp_buffer, size_to_read);
                 // can overwrite the ring buffer to avoid that
-                if (sound.sample_count == sound_played_count) {
+                if (sound->sample_count == sound_played_count) {
                     ring_buffer_reset(&ring_buffer);
                 }
         }
@@ -221,8 +231,9 @@ int main(int argc, char **argv) {
         
         // Update On Input
         //----------------------------------------------------------------------------------
+        Note current_note = synth.current_note;
         if (detect_note_pressed(&current_note)) {
-            sound = get_note_sound(current_note);
+            *sound = get_note_sound(&synth, current_note);
             sound_played_count = 0;
             write_log("Note played: %s\n", current_note.name);
         }
@@ -248,7 +259,7 @@ int main(int argc, char **argv) {
     SynthSound* sounds = malloc(sizeof(SynthSound) * note_array.count);
     for (size_t i = 0; i < note_array.count; i++) {
         Note note = note_array.notes[i];
-        sounds[i] = get_note_sound(note);
+        sounds[i] = get_note_sound(&synth, note);
     }
 
     SynthSound song = concat_sounds(sounds, note_array.count);