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 // John Allison  27th March 1996
 //
 // Class description
 //
 // Abstract interface class for graphics viewers.
 
 #ifndef G4VVIEWER_HH
 #define G4VVIEWER_HH
 
 #include "globals.hh"
 
 #include "G4SceneTreeItem.hh"
 
 #include "G4ViewParameters.hh"
 #include "G4PhysicalVolumeModel.hh"
 #include "G4PseudoScene.hh"
 
 #include <vector>
 #include <list>
 
 class G4VSceneHandler;
 
 // clang-format off
 class G4VViewer {
 
 public: // With description
 
   friend std::ostream& operator << (std::ostream& os, const G4VViewer& v);
 
   G4VViewer (G4VSceneHandler&, G4int id, const G4String& name = "");
   virtual ~G4VViewer ();
 
   virtual void Initialise ();
   // Called immediately after construction for those operations that
   // must await complete contruction of viewer and all its bases.  For
   // example, if this class (G4VViewer) is inherited virtually, as in
   // the OpenGL sub-category, it will not be fully constructed until
   // *after* the the derived viewer (this is the rule about order of
   // construction for virtual inheritance), so the derived viewer may
   // not use information in G4VViewer in its contructor.  Hence such
   // code must be in Initialise().
 
   //////////////////////////////////////////////////////////////
   // View manipulation functions.
 
   virtual void ResetView ();
   // Reset view parameters to default, including sub-class parameters, if any.
   // The sub-class should always invoke the base class implementation, i.e:
   // virtual void SubClass::ResetView () {
   //   G4VViewer::ResetView();
   //   // Then reset sub-class parameters
   //   ...
 
   virtual void SetView () = 0;
   // Take view parameters and work out model/view transformation,
   // projection transformation, lighting, etc.
 
   virtual void ClearView () = 0;
   // Clear screen/viewing buffers.
 
   virtual void DrawView () = 0;
   // Draw view of the scene currently attached to the scene handler -
   // see example of a minimal function at end of this file.
   
   void RefreshView ();
   // Simply invokes SetView, ClearView, DrawView.
 
   virtual void ShowView ();
   // Show view (for graphics systems which require to process
   // all drawn objects before finalising the view).
 
   virtual void FinishView ();
   // Called at the end of drawing scene.  Used to flush streams, or
   // swap buffers.  (Perhaps it is inappropriately named, perhaps its
   // function could be incorporated into EndModeling ().  It marks the
   // end of scene drawing; be aware hits and digi drawing may Follow.
   // It is not yet the end of all drawing; that is signalled by
   // ShowView ().)
 
   std::vector<G4ThreeVector> ComputeFlyThrough(G4Vector3D*);
 
 #ifdef G4MULTITHREADED
   // Note: the order of calling of MovingToVisSubThread and SwitchToVisSubThread
   // is undefined, so you may need to implement mutexes to ensure your preferred
   // order - see, e.g., G4OpenGLQtViewer. To summarise, the order of calling is
   // as follows - see G4VisManager.cc.
   // DoneWithMasterThread
   // MovingToVisSubThread ) or ( SwitchToVisSubThread
   // SwitchToVisSubThread )    ( MovingToVisSubThread
   // DoneWithVisSubThread
   // MovingToMasterThread
   // SwitchToMasterThread
 
   // Called on the master thread before starting the vis sub-thread.
   virtual void DoneWithMasterThread ();
 
   // Called on the master thread after starting the vis sub-thread.
   virtual void MovingToVisSubThread ();
 
   // Called on the vis sub-thread at start of vis sub-thread.
   virtual void SwitchToVisSubThread ();
 
   // Called on the vis sub-thread when all events have been processed.
   virtual void DoneWithVisSubThread ();
 
   // Called on the vis sub-thread when all events have been processed.
   virtual void MovingToMasterThread ();
   
   // Called on the master thread after the vis sub-thread has terminated.
   virtual void SwitchToMasterThread ();
 #endif
 
   //////////////////////////////////////////////////////////////
   // Stuff for scene tree.
   /**
    - The scene tree is a tree of G4SceneTreeItem objects (see graphics-reps).
    - Its root is a data member fSceneTree of all viewers by virtue of
    G4VViewer inheritance,
    - G4SceneTreeItem is an aggregate of data members that represent
    properties of objects in the scene (G4Scene). Its data members are
    low-level types - G4String, G4VisAttributes and G4AttDef/Value - so
    that it can be used across categories, avoiding coupling.
    - The root item has children that represent the models (G4VModel
    sub-classes) in the scene.
    - For a G4PhysicalVolumeModel (detector components), its children and
    children's children, etc., imitate the geometry hierarchy of that
    model. These descendants are called "touchables".
    - There may be more than one G4PhysicalVolumeModel, depending how
    the user creates his/her scene.
    - The scene tree is reviewed, and updated if necessary, at every pass
    of G4VSceneHandler::ProcessScene.  This is called a "kernel visit".
    - A kernel visit is triggered by some vis commands (e.g.,
    /vis/viewer/rebuild) and by a viewer if it deems necessary. For
    example, a kernel visit may not be required for a rotation, zoom, etc.,
    but required for a change from surface to wireframe.
    - The idea is that the scene tree can be passed to a GUI, the GUI can
    create a tree widget, and interactions with it raise UI commands such as
    /vis/scene/activateModel, /vis/set/touchable and /vis/touchable/set/...
    The viewer decides if this requires a kernel visit, otherwise it
    must update fSceneTree itself (utilities are provided -
    G4VViewer::TouchableSetVisibility/Colour).
   */
   class SceneTreeScene: public G4PseudoScene {
     // G4PhysicalVolumeModel sends touchables to this scene
   public:
     SceneTreeScene() = default;
     ~SceneTreeScene() = default;
     void SetViewer(G4VViewer* pViewer) {fpViewer = pViewer;}
     void SetModel(G4VModel* pModel);  // ...and more (see .cc)
   private:
     void ProcessVolume(const G4VSolid& solid) override;
     std::list<G4SceneTreeItem>::iterator FindOrInsertModel
     (const G4String& modelType,const G4String& modelID);
     std::list<G4SceneTreeItem>::iterator FindOrInsertTouchable
     (const G4String& modelID, G4SceneTreeItem& mother,
      G4int depth, const G4String& partialPathString, const G4String& fullPathString);
     G4VViewer* fpViewer = nullptr;
     G4VModel* fpModel = nullptr;
     G4int fMaximumExpandedDepth = 0;  // To be calculated in SetModel
     const G4int fMaximumExpanded = 30;  // So as not to swamp the GUI
   };
   SceneTreeScene& AccessSceneTreeScene() {return fSceneTreeScene;}
   G4SceneTreeItem& AccessSceneTree() {return fSceneTree;}
   void UpdateGUISceneTree();  // A utility
 
   //////////////////////////////////////////////////////////////
   // Access functions.
   const G4String&         GetName           () const;
   const G4String&         GetShortName      () const;
   void                    SetName           (const G4String&);
   G4int                   GetViewId         () const;
   G4VSceneHandler*        GetSceneHandler   () const;
   const G4ViewParameters& GetViewParameters        () const;
   const G4ViewParameters& GetDefaultViewParameters () const;
   G4double                GetKernelVisitElapsedTimeSeconds () const;
 
   virtual const std::vector<G4ModelingParameters::VisAttributesModifier>*
   GetPrivateVisAttributesModifiers() const;
   // So that privately accumulated vis attributes modifiers may be
   // concatenated with the standard vis attributes modifiers for commands
   // such as /vis/viewer/set/all and /vis/viewer/save.
 
   void SetViewParameters         (const G4ViewParameters& vp);
   void SetDefaultViewParameters  (const G4ViewParameters& vp);
 
   //////////////////////////////////////////////////////////////
   // Public utility functions.
 
   const G4VisAttributes*  GetApplicableVisAttributes
                                             (const G4VisAttributes*) const;
 
   void SetNeedKernelVisit (G4bool need);
   // Sets individual need-visit flag.
 
   void NeedKernelVisit ();
   // Flags all views the need to re-visit the GEANT4 kernel to refresh
   // the scene.
 
   void ProcessView ();
   // Used by DrawView ().  Invokes SetView ().  The basic logic is here.
 
 protected:
 
   //////////////////////////////////////////////////////////////
   // Protected utility functions.
 
   void SetTouchable
   (const std::vector<G4PhysicalVolumeModel::G4PhysicalVolumeNodeID>& fullPath);
   // Set the touchable for /vis/touchable/set/... commands.
 
   void TouchableSetVisibility
   (const std::vector<G4PhysicalVolumeModel::G4PhysicalVolumeNodeID>& fullPath,
    G4bool visibility);
   // Set the touchable visibility attribute.
   // Changes the Vis Attribute Modifiers WITHOUT triggering a rebuild.
 
   void TouchableSetColour
   (const std::vector<G4PhysicalVolumeModel::G4PhysicalVolumeNodeID>& fullPath,
    const G4Colour&);
   // Set the touchable colour attribute.
   // Changes the Vis Attribute Modifiers WITHOUT triggering a rebuild.
 
   //////////////////////////////////////////////////////////////
   // Data members
   G4VSceneHandler&        fSceneHandler;     // Abstract scene for this view.
   G4int            fViewId;    // Id of this instance.
   G4String         fName;
   G4String         fShortName; // Up to first ' ' character, if any.
   G4ViewParameters fVP;        // View parameters.
   G4ViewParameters fDefaultVP; // Default view parameters.
   G4double         fKernelVisitElapsedTimeSeconds = 999.;  // Default to a large number
   // Note: fKernelVisitElapsedTimeSeconds is measured in ProcessView().
   SceneTreeScene   fSceneTreeScene;  // G4PhysicalVolumeModel sends touchables to this scene
   G4SceneTreeItem  fSceneTree;
 
   //////////////////////////////////////////////////////////////
   // Other parameters.
   G4bool           fNeedKernelVisit;  // See DrawView() for comments.
 };
 
 #include "G4VViewer.icc"
 
 /*********************************************
 
 Here is a minimal DrawView () as it might be implemented in the
 concrete viewer.
 
 void G4VViewer::DrawView () {  // Default - concrete view usually overrides.
 
   // First, a view should decide when to re-visit the G4 kernel.
   // Sometimes it might not be necessary, e.g., if the scene is stored
   // in a graphical database (e.g., OpenGL's display lists) and only
   // the viewing angle has changed.  But graphics systems without a
   // graphical database will always need to visit the G4 kernel.
 
   NeedKernelVisit ();  // Default is - always visit G4 kernel.
   // Note: this routine sets the fNeedKernelVisit flag of *all* the views of
   // the scene.
 
   ProcessView ();             // The basic logic is here.
 
   // Then a view may have more to do, e.g., display the graphical
   // database.  That code should come here before finally...
 
   FinishView ();              // Flush streams and/or swap buffers.
 }
 
 *********************************************/
 
 #endif

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