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glwidget.h Example File
^{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;
    };