glwidget.h Example File

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 #ifndef GLWIDGET_H
 #define GLWIDGET_H

 #include <QOpenGLWidget>
 #include <QOpenGLFunctions>
 #include <QOpenGLVertexArrayObject>
 #include <QOpenGLBuffer>
 #include <QMatrix4x4>
 #include "logo.h"

 QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram)

 class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
 {
     Q_OBJECT

 public:
     GLWidget(QWidget *parent = 0);
     ~GLWidget();

     static bool isTransparent() { return m_transparent; }
     static void setTransparent(bool t) { m_transparent = t; }

     QSize minimumSizeHint() const override;
     QSize sizeHint() const override;

 public slots:
     void setXRotation(int angle);
     void setYRotation(int angle);
     void setZRotation(int angle);
     void cleanup();

 signals:
     void xRotationChanged(int angle);
     void yRotationChanged(int angle);
     void zRotationChanged(int angle);

 protected:
     void initializeGL() override;
     void paintGL() override;
     void resizeGL(int width, int height) override;
     void mousePressEvent(QMouseEvent *event) override;
     void mouseMoveEvent(QMouseEvent *event) override;

 private:
     void setupVertexAttribs();

     bool m_core;
     int m_xRot;
     int m_yRot;
     int m_zRot;
     QPoint m_lastPos;
     Logo m_logo;
     QOpenGLVertexArrayObject m_vao;
     QOpenGLBuffer m_logoVbo;
     QOpenGLShaderProgram *m_program;
     int m_projMatrixLoc;
     int m_mvMatrixLoc;
     int m_normalMatrixLoc;
     int m_lightPosLoc;
     QMatrix4x4 m_proj;
     QMatrix4x4 m_camera;
     QMatrix4x4 m_world;
     static bool m_transparent;
 };

 #endif