examples/ofx/Bitalino_rapidmix/src/SigTools.cpp

+//
+//  SigTools.cpp
+//  
+//
+//  Created by James on 08/01/17.
+//
+//
+
+#include "SigTools.hpp"
+
+double MTOF ( unsigned char midi ) {
+    return pow( 2, static_cast< double >( midi-69 ) / 12.0 ) * 440.0;
+}
+
+double FTOM ( double freq ) {
+    return 12.0 * log2( freq / 440.0 ) + 69;
+}

examples/ofx/Bitalino_rapidmix/src/SigTools.hpp

+//
+//  SigTools.hpp
+//  
+//
+//  Created by James on 08/01/17.
+//
+//
+
+#ifndef SigTools_hpp
+#define SigTools_hpp
+
+#include <stdio.h>
+#include <math.h>
+
+double MTOF ( unsigned char midi );
+double FTOM ( double freq );
+
+#endif /* SigTools_hpp */

examples/ofx/Bitalino_rapidmix/src/Spinlock.hpp

+//
+//  Spinlock.h
+//  beladrum
+//
+//  Created by James on 11/05/17.
+//  Copyright © 2017 HKU. All rights reserved.
+//
+
+#ifndef Spinlock_h
+#define Spinlock_h
+
+#include <atomic>
+
+class Spinlock {
+    std::atomic_flag locked = ATOMIC_FLAG_INIT ;
+public:
+    void lock ( void ) {
+        while (locked.test_and_set(std::memory_order_acquire)) { ; }
+    }
+    void unlock ( void ) {
+        locked.clear(std::memory_order_release);
+    }
+};
+
+#endif /* Spinlock_h */

examples/ofx/Bitalino_rapidmix/src/main.cpp

+#include "ofApp.h"
+#include "ofAppGlutWindow.h"
+
+//========================================================================
+int main( ){
+    ofAppGlutWindow window;
+	ofSetupOpenGL( &window, 1024, 768, OF_WINDOW );			// <-------- setup the GL context
+
+	ofRunApp( new ofApp(  ) );
+
+}