[feature]: ADSR (#15)

closes #14

Reviewed-on: #15

src/Synth.cpp

@@ -1,32 +1,83 @@
 #include "Synth.h"
+#include "ADSR.h"
 #include "KeyBoard.h"
+#include "Logger.h"
 #include "OscillatorType.h"
 #include "Settings.h"
 
-Synth::Synth(/* args */) { AddOscillator(); }
+Synth::Synth(/* args */) {
+    AddOscillator();
+    AddEffect(new ADSR());
+    for (size_t i = 0; i < STREAM_BUFFER_SIZE; i++) {
+        float sample = 0.0f;
+        m_out_signal.push_back(sample);
+    }
+    zero_signal();
+}
 
-Synth::~Synth() {}
+Synth::~Synth() {
+    m_oscillators.clear();
+    m_effects.clear();
+    m_out_signal.clear();
+}
 
-std::vector<float>& Synth::get_note(int semitone, float beats) {
-    float hz = KeyBoard::GetHzBySemitone(semitone);
-    float duration = beats * BEAT_DURATION;
+void Synth::zero_signal() {
+    float sample = 0.0f;
+    for (size_t i = 0; i < STREAM_BUFFER_SIZE; i++) {
+        m_out_signal[i] = sample;
+    }
+}
+
+void Synth::get_note() {
+    zero_signal();
+    Adder::SumOscillators(m_oscillators, m_out_signal);
+}
+
+void Synth::apply_effects() {
+    for (Effect* effect : m_effects) {
+        effect->Process(m_out_signal);
+    }
+}
+
+void Synth::trigger_note_on_effects() {
+    for (Effect* effect : m_effects) {
+        effect->OnSetNote();
+    }
+}
+
+void Synth::untrigger_note_on_effects() {
+    for (Effect* effect : m_effects) {
+        effect->OnUnsetNote();
+    }
+}
+
+void Synth::TriggerNote(Note input) {
+    int semitone_shift = KeyBoard::GetSemitoneShift(input.name);
+    float hz = KeyBoard::GetHzBySemitone(semitone_shift);
 
     // will change after oscillator starts to be more autonomous
     for (Oscillator* osc : m_oscillators) {
         osc->SetFreq(hz);
     }
-
-    // todo: add other pipeline steps (e.g ADSR, Filters, FX);
-    return m_adder.SumOscillators(m_oscillators, duration);
+    is_note_triggered = true;
+    trigger_note_on_effects();
 }
 
-void Synth::ProduceNoteSound(Note input) {
-    float length = 1.f / input.length;
-    int semitone_shift = KeyBoard::GetSemitoneShift(input.name);
-    m_out_signal = get_note(semitone_shift, length);
+void Synth::ProduceSound() {
+    get_note();
+    apply_effects();
+}
+
+// todo: rename to something like untrigger note
+void Synth::StopSound() {
+    zero_signal();
+    is_note_triggered = false;
+    untrigger_note_on_effects();
 }
 
 void Synth::AddOscillator() {
     m_oscillators.push_back(
         new Oscillator(OscillatorType::Sine, 440.f, VOLUME));
 }
+
+void Synth::AddEffect(Effect* fx) { m_effects.push_back(fx); }