Implemented: Application icons; OpenSceneGraph to handle OpenGL with Qt; devicePixelRatio() for handing render on highDPI displays; Sample 3D with handler; MouseHandler not yet working as expected (WIP)

src/qtviewer/MessageLogger.h

@@ -0,0 +1,40 @@
+#include <QObject>
+#include <string>
+
+// SINGLETON
+class MessageLogger : public QObject
+{
+    Q_OBJECT
+
+signals:
+    void logMessage(const QString& message);
+
+public:
+    static MessageLogger& getInstance()
+    {
+        static MessageLogger instance;
+        return instance;
+    }
+
+    // Convenience function to log a message
+    static void log(const std::string& message)
+    {
+        getInstance().emitMessage(message);
+    }
+
+private slots:
+    void emitMessage(const std::string& message)
+    {
+        emit logMessage(QString::fromStdString(message));
+    }
+
+private:
+    MessageLogger() {}
+    ~MessageLogger() {}
+
+    // Disable copy constructor for MessageLogger
+    MessageLogger(const MessageLogger&) = delete;
+
+    // Disable copy assignment operator for MessageLogger
+    MessageLogger& operator=(const MessageLogger&) = delete;
+};