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

implemented in c++ to improve readability and simplify maintenance

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

src/Application.cpp

@@ -0,0 +1,184 @@
+#include "Application.h"
+#include "Settings.h"
+#include "Logger.h"
+#include <string>
+
+Application::Application(/* args */)
+{
+    m_ring_buffer = new RingBuffer<float>((std::size_t)STREAM_BUFFER_SIZE);
+    m_temp_buffer = new float[STREAM_BUFFER_SIZE];
+    init_synth();
+    init_audio();
+}
+
+Application::~Application()
+{
+    StopAudioStream(m_synth_stream);
+    UnloadAudioStream(m_synth_stream);    
+    CloseAudioDevice();
+    CloseWindow();
+    delete m_ring_buffer;
+    delete[] m_temp_buffer;
+    // todo: move to gui state class destructor (make it a class)
+    for(int i = 0; i < m_synth_gui_state.oscillators.size(); i++) {
+        delete m_synth_gui_state.oscillators[i];
+    }
+}
+
+void Application::init_audio() 
+{
+    m_sound_played_count = 0;
+
+    InitAudioDevice();
+    SetMasterVolume(SYNTH_VOLUME);
+    SetAudioStreamBufferSizeDefault(STREAM_BUFFER_SIZE);
+    m_synth_stream = LoadAudioStream(SAMPLE_RATE, sizeof(float) * 8, 1);
+    SetAudioStreamVolume(m_synth_stream, 0.5f);
+
+    PlayAudioStream(m_synth_stream);
+}
+
+void Application::init_synth() 
+{
+    //todo: move that variables to Synth declaration
+    std::string* nameString = new std::string(std::string(new char[3])); 
+    m_current_note = new Note 
+    {
+        .length = 1,
+        .name = (*nameString)
+    };
+
+    //todo: move somewhere in initialization
+    std::vector<Oscillator*> oscillators = m_synth.GetOscillators();
+    m_synth_gui_state.oscillators.reserve(oscillators.size());
+    for (size_t i = 0; i < oscillators.size(); i++)
+    {
+        Oscillator* osc = oscillators[i];
+        assert(osc);
+
+        OscillatorGuiState* ui = new OscillatorGuiState {
+            .freq = osc->GetFreq(),
+            .waveshape = osc->GetType(),
+            .volume = osc->GetVolume()
+        };
+        m_synth_gui_state.oscillators.push_back(ui);
+    }
+}
+
+std::size_t Application::detect_note_pressed(Note* note) 
+{
+    std::size_t is_pressed = 0;
+    note->length = 8;
+    if (IsKeyPressed(KEY_A)) 
+    {
+        note->name.assign("A4");
+        is_pressed = 1;
+    }
+    if (IsKeyPressed(KEY_B)) 
+    {
+        note->name.assign("B4");
+        is_pressed = 1;
+    }
+    if (IsKeyPressed(KEY_C)) 
+    {
+        note->name.assign("C4");
+        is_pressed = 1;
+    }
+    if (IsKeyPressed(KEY_D)) 
+    {
+        note->name.assign("D4");
+        is_pressed = 1;
+    }
+    if (IsKeyPressed(KEY_E)) 
+    {
+        note->name.assign("E4");
+        is_pressed = 1;
+    }
+    if (IsKeyPressed(KEY_F)) 
+    {
+        note->name.assign("F4");
+        is_pressed = 1;
+    }
+    if (IsKeyPressed(KEY_G)) 
+    {
+        note->name.assign("G4");
+        is_pressed = 1;
+    }
+    return is_pressed;
+}
+
+// Update On Input
+void Application::update_on_note_input()
+{
+    if (detect_note_pressed(m_current_note)) 
+    {
+        m_synth.ProduceNoteSound((*m_current_note));
+        m_sound_played_count = 0;
+        write_log("Note played: %s\n", m_current_note->name.c_str());
+    }
+}
+
+// Play ring-buffered audio
+void Application::play_buffered_audio()
+{
+    if (IsAudioStreamProcessed(m_synth_stream) && !m_ring_buffer->IsEmpty()) 
+    {
+        std::size_t size_to_read = m_ring_buffer->GetSize();
+        
+        write_log("Samples to play:%zu \n", size_to_read);
+        //todo: try to start reading directly from ring buffer, avoiding temp_buffer
+        m_ring_buffer->Read(m_temp_buffer, size_to_read);
+        // can try the SetAudioStreamCallback
+        UpdateAudioStream(m_synth_stream, m_temp_buffer, size_to_read);
+        // can overwrite the ring buffer to avoid that
+        if (m_synth.GetOutSignal().size() == m_sound_played_count) 
+        {
+            m_ring_buffer->Reset();
+        }
+    }
+}
+
+// Fill ring buffer from current sound
+void Application::fill_audio_buffer()
+{
+    if (!m_ring_buffer->IsFull() && m_synth.GetOutSignal().size() != m_sound_played_count) 
+    {
+        write_log("[INFO] IsFull:%d Samples:%zu Played:%d\n", 
+            m_ring_buffer->IsFull(), 
+            m_synth.GetOutSignal().size(), 
+            m_sound_played_count);
+        
+        // how many samples need write
+        std::size_t size_to_fill = 0;
+        
+        if ((m_synth.GetOutSignal().size() - m_sound_played_count) > m_ring_buffer->GetCapacity()) 
+        {
+            size_to_fill = m_ring_buffer->GetCapacity();
+        } else 
+        {
+            size_to_fill = m_synth.GetOutSignal().size() - m_sound_played_count;
+        }
+
+        write_log("[INFO] SizeToFill:%zu\n", size_to_fill);
+        for (size_t i = 0; i < size_to_fill; i++) 
+        {
+            m_temp_buffer[i] = m_synth.GetOutSignal()[i];
+        }
+        
+        m_ring_buffer->Write(m_temp_buffer, size_to_fill);
+        m_sound_played_count += size_to_fill;
+    }
+}
+
+void Application::Run()
+{
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        fill_audio_buffer();
+        play_buffered_audio();
+        update_on_note_input();
+
+        m_renderer.Draw(m_synth, m_synth_gui_state);
+    }
+}