[refactor]: c++ implementation (#13)

implemented in c++ to improve readability and simplify maintenance

Co-authored-by: HiveBeats <e1lama@protonmail.com>
Reviewed-on: #13

inc/Oscillator.h

@@ -0,0 +1,40 @@
+#pragma once
+#include<vector>
+#include "OscillatorType.h"
+
+
+class Oscillator
+{
+    //typedef float (Oscillator::*OscFunction)(void);
+    //typedef float (Oscillator::*DtFunction)(float);
+    
+    private:
+        OscillatorType m_osc;
+        float m_freq;
+        float m_volume;
+        float m_phase;
+        float m_phase_dt;
+        //значение типа "float (Oscillator::*)()" нельзя присвоить сущности типа "float (*)()"
+        float (Oscillator::*m_osc_function)(void);
+        float (Oscillator::*m_dt_function)(float freq);
+        void sine_osc_phase_incr();
+        void saw_osc_phase_incr();
+        float calc_saw_phase_delta(float freq);
+        float calc_sine_phase_delta(float freq);
+        float sawosc();
+        float triangleosc();
+        float squareosc();
+        float sign(float v);
+        float sineosc();
+    public:
+        Oscillator(OscillatorType osc, float freq, 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; }
+        void SetFreq(float freq);
+        void Reset();
+        float GenerateSample(float duration);
+};