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