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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;
 };