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();

      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;
      bool m_transparent;
  };

  #endif