wip: oscillator fine-tune

inc/KeyBoard.h

@@ -54,10 +54,9 @@ class KeyBoard {
     }
 
   public:
-    KeyBoard(/* args */);
-    ~KeyBoard();
 
-    static float GetHzBySemitone(int semitone) {
+    static float GetHzBySemitone(float semitone) {
+        //440 * Math.Pow(2, (note - 69) / 12.0) would it be better?
         return PITCH_STANDARD * powf(powf(2.f, (1.f / 12.f)), semitone);
     }
 
@@ -71,7 +70,3 @@ class KeyBoard {
         return result;
     }
 };
-
-KeyBoard::KeyBoard(/* args */) {}
-
-KeyBoard::~KeyBoard() {}

inc/Oscillator.h

@@ -5,31 +5,34 @@
 class Oscillator {
   private:
     OscillatorType m_osc;
-    float m_freq;
+    float m_fine;
+    float m_key;
     float m_volume;
     float m_phase;
     float m_phase_dt;
     float (Oscillator::*m_osc_function)(void);
     float (Oscillator::*m_dt_function)(float freq);
-    void sine_osc_phase_incr();
+    void SineOscPhaseIncr();
-    void saw_osc_phase_incr();
+    void SawOscPhaseIncr();
-    float calc_saw_phase_delta(float freq);
+    float CalcSawPhaseDelta(float freq);
-    float calc_sine_phase_delta(float freq);
+    float CalcSinePhaseDelta(float freq);
-    float sawosc();
+    float SawOsc();
-    float triangleosc();
+    float TriangleOsc();
-    float squareosc();
+    float SquareOsc();
-    float sign(float v);
+    float Sign(float v);
-    float sineosc();
+    float SineOsc();
 
   public:
-    Oscillator(OscillatorType osc, float freq, float volume);
+    Oscillator(OscillatorType osc, float fine, float volume);
     ~Oscillator();
     OscillatorType GetType() { return m_osc; }
     void SetType(OscillatorType osc);
     float GetVolume() { return m_volume; }
     void SetVolume(float volume) { m_volume = volume; }
-    float GetFreq() { return m_freq; }
+    float GetKey() { return m_key; }
-    void SetFreq(float freq);
+    void SetKey(float key);
+    float GetFine() { return m_fine; }
+    void SetFine(float fine) { assert(fine >= -2.f && fine <= 2.f); m_fine = fine; }
     void Reset();
     float Process();
 };

inc/SynthGuiState.h

@@ -6,7 +6,7 @@
 
 struct OscillatorGuiState {
     float volume;
-    float freq; // todo: remove or change to pitch shift
+    float fine;
     OscillatorType waveshape;
     bool is_dropdown_open;
     Rectangle shape_dropdown_rect;

src/Application.cpp

@@ -43,7 +43,7 @@ void Application::InitSynth() {
         assert(osc);
 
         OscillatorGuiState* ui =
-            new OscillatorGuiState{.freq = osc->GetFreq(),
+            new OscillatorGuiState{.fine = osc->GetFine(),
                                    .waveshape = osc->GetType(),
                                    .volume = osc->GetVolume()};
         m_synth_gui_state.oscillators.push_back(ui);

src/Oscillator.cpp

@@ -1,11 +1,13 @@
 #include "Oscillator.h"
 #include "Settings.h"
+#include "KeyBoard.h"
+#include "Logger.h"
 
 #define TWO_PI 2 * SYNTH_PI
 
-Oscillator::Oscillator(OscillatorType osc, float freq, float volume) {
+Oscillator::Oscillator(OscillatorType osc, float fine, float volume) {
     SetType(osc);
-    m_freq = freq;
+    m_fine = fine;
     m_volume = volume;
 }
 
@@ -21,26 +23,27 @@ void Oscillator::SetType(OscillatorType osc) {
     m_osc = osc;
     switch (m_osc) {
         case Sine:
-            m_osc_function = &Oscillator::sineosc;
+            m_osc_function = &Oscillator::SineOsc;
-            m_dt_function = &Oscillator::calc_sine_phase_delta;
+            m_dt_function = &Oscillator::CalcSinePhaseDelta;
             break;
         case Triangle:
-            m_osc_function = &Oscillator::triangleosc;
+            m_osc_function = &Oscillator::TriangleOsc;
-            m_dt_function = &Oscillator::calc_saw_phase_delta;
+            m_dt_function = &Oscillator::CalcSawPhaseDelta;
             break;
         case Square:
-            m_osc_function = &Oscillator::squareosc;
+            m_osc_function = &Oscillator::SquareOsc;
-            m_dt_function = &Oscillator::calc_sine_phase_delta;
+            m_dt_function = &Oscillator::CalcSinePhaseDelta;
             break;
         case Saw:
-            m_osc_function = &Oscillator::sawosc;
+            m_osc_function = &Oscillator::SawOsc;
-            m_dt_function = &Oscillator::calc_saw_phase_delta;
+            m_dt_function = &Oscillator::CalcSawPhaseDelta;
             break;
     }
 }
 
-void Oscillator::SetFreq(float freq) {
+void Oscillator::SetKey(float key) {
-    m_freq = freq;
+    float freq = KeyBoard::GetHzBySemitone(key + m_fine);
+    write_log("Frequency: %.1f\n", freq);
     m_phase = 0;
     m_phase_dt = (this->*m_dt_function)(freq);
 }
@@ -49,44 +52,44 @@ float Oscillator::Process() {
     return (this->*m_osc_function)() * m_volume;
 }
 
-void Oscillator::sine_osc_phase_incr() {
+void Oscillator::SineOscPhaseIncr() {
     m_phase += m_phase_dt;
     if (m_phase >= TWO_PI)
         m_phase -= TWO_PI;
 }
 
-void Oscillator::saw_osc_phase_incr() {
+void Oscillator::SawOscPhaseIncr() {
     m_phase += m_phase_dt;
     if (m_phase >= 1.0f)
         m_phase -= 1.0f;
 }
 
-float Oscillator::calc_saw_phase_delta(float freq) {
+float Oscillator::CalcSawPhaseDelta(float freq) {
     return freq / SAMPLE_RATE;
 }
 
-float Oscillator::calc_sine_phase_delta(float freq) {
+float Oscillator::CalcSinePhaseDelta(float freq) {
     return (TWO_PI * freq) / SAMPLE_RATE;
 }
 
-float Oscillator::sineosc() {
+float Oscillator::SineOsc() {
     float result = sinf(m_phase);
-    sine_osc_phase_incr();
+    SineOscPhaseIncr();
     return result;
 }
 
-float Oscillator::sign(float v) { return (v > 0.0) ? 1.f : -1.f; }
+float Oscillator::Sign(float v) { return (v > 0.0) ? 1.f : -1.f; }
 
-float Oscillator::squareosc() { return sign(sineosc()); }
+float Oscillator::SquareOsc() { return Sign(SineOsc()); }
 
-float Oscillator::triangleosc() {
+float Oscillator::TriangleOsc() {
     float result = 1.f - fabsf(m_phase - 0.5f) * 4.f;
-    saw_osc_phase_incr();
+    SawOscPhaseIncr();
     return result;
 }
 
-float Oscillator::sawosc() {
+float Oscillator::SawOsc() {
     float result = m_phase * 2.f - 1.f;
-    saw_osc_phase_incr();
+    SawOscPhaseIncr();
     return result;
 }

src/Synth.cpp

@@ -56,15 +56,14 @@ void Synth::UntriggerNoteOnEffects() {
 
 void Synth::AddOscillator() {
     m_oscillators.push_back(
-        new Oscillator(OscillatorType::Sine, 440.f, VOLUME));
+        new Oscillator(OscillatorType::Sine, 0.0f, VOLUME));
 }
 
 void Synth::Trigger(Note input) {
     int semitone_shift = KeyBoard::GetSemitoneShift(input.name);
-    float hz = KeyBoard::GetHzBySemitone(semitone_shift);
 
     for (Oscillator* osc : m_oscillators) {
-        osc->SetFreq(hz);
+        osc->SetKey(semitone_shift);
     }
     is_note_triggered = true;
     TriggerNoteOnEffects();