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glwidget.h Example File
opengl/pbuffers/glwidget.h

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 #include <QtOpenGL>

 class GLWidget : public QGLWidget
 {
 public:
     GLWidget(QWidget *parent);
     ~GLWidget();
     void initializeGL();
     void resizeGL(int w, int h);
     void paintGL();
     void timerEvent(QTimerEvent *) { update(); }
     void mousePressEvent(QMouseEvent *) { killTimer(timerId); }
     void mouseReleaseEvent(QMouseEvent *) { timerId = startTimer(20); }

     void drawCube(int i, GLfloat z, GLfloat ri, GLfloat jmp, GLfloat amp);
     void initCommon();
     void initPbuffer();

 private:
     GLfloat rot[3], xOffs[3], yOffs[3], xInc[3];
     GLuint pbufferList;
     GLuint dynamicTexture;
     GLuint cubeTexture;
     int timerId;
     bool hasDynamicTextureUpdate;

     QGLPixelBuffer *pbuffer;
 };