qt5base-lts/examples/opengl/samplebuffers/glwidget.h

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#include <QtOpenGL>

class GLWidget : public QGLWidget
{
public:
    GLWidget(QWidget *parent);

protected:
    void initializeGL();
    void resizeGL(int w, int h);
    void paintGL();
    void timerEvent(QTimerEvent *);

    void makeObject();
    void quad(GLenum primitive, GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2,
              GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4);

private:
    GLuint list;
};