small refactoring

openglwindow.h

@@ -24,7 +24,7 @@ class QOpenGLContext;
 class QOpenGLPaintDevice;
 
 
-class OpenGLWindow: public QWindow, protected QOpenGLExtraFunctions
+class OpenGLWindow: public QWindow, public QOpenGLExtraFunctions
 {
 	Q_OBJECT
 public:
@@ -33,9 +33,7 @@ public:
 
 	virtual void render(QPainter *painter);
 	virtual void render();
-
 	virtual void initialize();
-
 	QOpenGLContext * context() {return m_context;}
 
 public slots:
@@ -44,7 +42,6 @@ public slots:
 
 protected:
 	bool event(QEvent *event) override;
-
 	void exposeEvent(QExposeEvent *event) override;
 
 private: