mainwidget.h Example File

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 #ifndef MAINWIDGET_H
 #define MAINWIDGET_H

 #include "geometryengine.h"

 #include <QOpenGLWidget>
 #include <QOpenGLFunctions>
 #include <QMatrix4x4>
 #include <QQuaternion>
 #include <QVector2D>
 #include <QBasicTimer>
 #include <QOpenGLShaderProgram>
 #include <QOpenGLTexture>

 class GeometryEngine;

 class MainWidget : public QOpenGLWidget, protected QOpenGLFunctions
 {
     Q_OBJECT

 public:
     explicit MainWidget(QWidget *parent = 0);
     ~MainWidget();

 protected:
     void mousePressEvent(QMouseEvent *e) override;
     void mouseReleaseEvent(QMouseEvent *e) override;
     void timerEvent(QTimerEvent *e) override;

     void initializeGL() override;
     void resizeGL(int w, int h) override;
     void paintGL() override;

     void initShaders();
     void initTextures();

 private:
     QBasicTimer timer;
     QOpenGLShaderProgram program;
     GeometryEngine *geometries;

     QOpenGLTexture *texture;

     QMatrix4x4 projection;

     QVector2D mousePressPosition;
     QVector3D rotationAxis;
     qreal angularSpeed;
     QQuaternion rotation;
 };

 #endif // MAINWIDGET_H