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

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 #ifndef GLWIDGET_H
 #define GLWIDGET_H

 #include <QGLWidget>

 class Geometry;
 class Cube;
 class Tile;
 class QGLPixelBuffer;

 class GLWidget : public QGLWidget
 {
 public:
     GLWidget(QWidget *parent = 0);
     ~GLWidget();

 protected:
     void initializeGL();
     void paintGL();
     void resizeGL(int width, int height);
     void mousePressEvent(QMouseEvent *) { setAnimationPaused(true); }
     void mouseReleaseEvent(QMouseEvent *) { setAnimationPaused(false); }

 private:
     void initializeGeometry();
     void initPbuffer();
     void initCommon();
     void perspectiveProjection();
     void orthographicProjection();
     void drawPbuffer();
     void setAnimationPaused(bool enable);

     qreal aspect;
     GLuint dynamicTexture;
     GLuint cubeTexture;
     bool hasDynamicTextureUpdate;
     QGLPixelBuffer *pbuffer;
     Geometry *geom;
     Cube *cube;
     Tile *backdrop;
     QList<Cube *> cubes;
     QList<Tile *> tiles;

 };

 #endif