scene.h Example File
demos/boxes/scene.h

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 #ifndef SCENE_H
 #define SCENE_H

 //#include <GL/glew.h>
 #include "glextensions.h"

 #include <QtGui>
 #include <QtOpenGL>

 #include "roundedbox.h"
 #include "gltrianglemesh.h"
 #include "trackball.h"
 #include "glbuffers.h"
 #include "qtbox.h"

 #define PI 3.14159265358979

 class QMatrix4x4;

 class ParameterEdit : public QWidget
 {
 public:
     virtual void emitChange() = 0;
 };

 class ColorEdit : public ParameterEdit
 {
     Q_OBJECT
 public:
     ColorEdit(QRgb initialColor, int id);
     QRgb color() const {return m_color;}
     virtual void emitChange() {emit colorChanged(m_color, m_id);}
 public slots:
     void editDone();
 signals:
     void colorChanged(QRgb color, int id);
 protected:
     virtual void mousePressEvent(QMouseEvent *event);
     void setColor(QRgb color); // also emits colorChanged()
 private:
     QGraphicsScene *m_dialogParentScene;
     QLineEdit *m_lineEdit;
     QFrame *m_button;
     QRgb m_color;
     int m_id;
 };

 class FloatEdit : public ParameterEdit
 {
     Q_OBJECT
 public:
     FloatEdit(float initialValue, int id);
     float value() const {return m_value;}
     virtual void emitChange() {emit valueChanged(m_value, m_id);}
 public slots:
     void editDone();
 signals:
     void valueChanged(float value, int id);
 private:
     QGraphicsScene *m_dialogParentScene;
     QLineEdit *m_lineEdit;
     float m_value;
     int m_id;
 };

 class GraphicsWidget : public QGraphicsProxyWidget
 {
 public:
     GraphicsWidget() : QGraphicsProxyWidget(0, Qt::Window) {}
 protected:
     virtual QVariant itemChange(GraphicsItemChange change, const QVariant &value);
     virtual void resizeEvent(QGraphicsSceneResizeEvent *event);
     virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
 };

 class TwoSidedGraphicsWidget : public QObject
 {
     Q_OBJECT
 public:
     TwoSidedGraphicsWidget(QGraphicsScene *scene);
     void setWidget(int index, QWidget *widget);
     QWidget *widget(int index);
 public slots:
     void flip();
 protected slots:
     void animateFlip();
 private:
     GraphicsWidget *m_proxyWidgets[2];
     int m_current;
     int m_angle; // angle in degrees
     int m_delta;
 };

 class RenderOptionsDialog : public QDialog
 {
     Q_OBJECT
 public:
     RenderOptionsDialog();
     int addTexture(const QString &name);
     int addShader(const QString &name);
     void emitParameterChanged();
 protected slots:
     void setColorParameter(QRgb color, int id);
     void setFloatParameter(float value, int id);
 signals:
     void dynamicCubemapToggled(int);
     void colorParameterChanged(const QString &, QRgb);
     void floatParameterChanged(const QString &, float);
     void textureChanged(int);
     void shaderChanged(int);
     void doubleClicked();
 protected:
     virtual void mouseDoubleClickEvent(QMouseEvent *event);

     QVector<QByteArray> m_parameterNames;
     QComboBox *m_textureCombo;
     QComboBox *m_shaderCombo;
     QVector<ParameterEdit *> m_parameterEdits;
 };

 class ItemDialog : public QDialog
 {
     Q_OBJECT
 public:
     enum ItemType {
         QtBoxItem,
         CircleItem,
         SquareItem,
     };

     ItemDialog();
 public slots:
     void triggerNewQtBox();
     void triggerNewCircleItem();
     void triggerNewSquareItem();
 signals:
     void doubleClicked();
     void newItemTriggered(ItemDialog::ItemType type);
 protected:
     virtual void mouseDoubleClickEvent(QMouseEvent *event);
 };

 class Scene : public QGraphicsScene
 {
     Q_OBJECT
 public:
     Scene(int width, int height, int maxTextureSize);
     ~Scene();
     virtual void drawBackground(QPainter *painter, const QRectF &rect);

 public slots:
     void setShader(int index);
     void setTexture(int index);
     void toggleDynamicCubemap(int state);
     void setColorParameter(const QString &name, QRgb color);
     void setFloatParameter(const QString &name, float value);
     void newItem(ItemDialog::ItemType type);
 protected:
     void renderBoxes(const QMatrix4x4 &view, int excludeBox = -2);
     void setStates();
     void setLights();
     void defaultStates();
     void renderCubemaps();

     virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
     virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
     virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
     virtual void wheelEvent(QGraphicsSceneWheelEvent * event);
 private:
     void initGL();
     QPointF pixelPosToViewPos(const QPointF& p);

     QTime m_time;
     int m_lastTime;
     int m_mouseEventTime;
     int m_distExp;
     int m_frame;
     int m_maxTextureSize;

     int m_currentShader;
     int m_currentTexture;
     bool m_dynamicCubemap;
     bool m_updateAllCubemaps;

     RenderOptionsDialog *m_renderOptions;
     ItemDialog *m_itemDialog;
     QTimer *m_timer;
     GLRoundedBox *m_box;
     TrackBall m_trackBalls[3];
     QVector<GLTexture *> m_textures;
     GLTextureCube *m_environment;
     GLTexture3D *m_noise;
     GLRenderTargetCube *m_mainCubemap;
     QVector<GLRenderTargetCube *> m_cubemaps;
     QVector<QGLShaderProgram *> m_programs;
     QGLShader *m_vertexShader;
     QVector<QGLShader *> m_fragmentShaders;
     QGLShader *m_environmentShader;
     QGLShaderProgram *m_environmentProgram;
 };

 #endif