scene.h Example File

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  #ifndef SCENE_H
  #define SCENE_H

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

  #include <QtWidgets>
  #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;}
      void emitChange() override { emit colorChanged(m_color, m_id); }
  public slots:
      void editDone();
  signals:
      void colorChanged(QRgb color, int id);
  protected:
      void mousePressEvent(QMouseEvent *event) override;
      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;}
      void emitChange() override { 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:
      QVariant itemChange(GraphicsItemChange change, const QVariant &value) override;
      void resizeEvent(QGraphicsSceneResizeEvent *event) override;
      void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
  };

  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:
      void mouseDoubleClickEvent(QMouseEvent *event) override;

      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:
      void mouseDoubleClickEvent(QMouseEvent *event) override;
  };

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

  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();

      void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
      void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override;
      void mouseMoveEvent(QGraphicsSceneMouseEvent *event) override;
      void wheelEvent(QGraphicsSceneWheelEvent * event) override;
  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