0030698: Volume Rendering - Early clipping of volume object's bounding box

[occt.git] / src / Graphic3d / Graphic3d_CStructure.hxx

// Copyright (c) 1995-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _Graphic3d_CStructure_HeaderFile
#define _Graphic3d_CStructure_HeaderFile

#include <Graphic3d_BndBox3d.hxx>
#include <Graphic3d_Group.hxx>
#include <Graphic3d_PresentationAttributes.hxx>
#include <Graphic3d_SequenceOfGroup.hxx>
#include <Graphic3d_SequenceOfHClipPlane.hxx>
#include <Graphic3d_TypeOfComposition.hxx>
#include <Graphic3d_ViewAffinity.hxx>
#include <Graphic3d_TransformPers.hxx>
#include <Graphic3d_Vec3.hxx>
#include <Graphic3d_ZLayerId.hxx>
#include <Geom_Transformation.hxx>
#include <NCollection_IndexedMap.hxx>

class Graphic3d_GraphicDriver;
class Graphic3d_StructureManager;

//! Low-level graphic structure interface
class Graphic3d_CStructure : public Standard_Transient
{
protected:

  //! Auxiliary wrapper to iterate through structure list.
  template<class Struct_t>
  class SubclassStructIterator
  {
  public:
    SubclassStructIterator (const NCollection_IndexedMap<const Graphic3d_CStructure*>& theStructs) : myIter (theStructs) {}
    Standard_Boolean More() const  { return myIter.More(); }
    void Next()                    { myIter.Next(); }
    const Struct_t*  Value() const { return (const Struct_t* )(myIter.Value()); }
    Struct_t*        ChangeValue() { return (Struct_t* )(myIter.Value()); }
  private:
    NCollection_IndexedMap<const Graphic3d_CStructure*>::Iterator myIter;
  };

  //! Auxiliary wrapper to iterate through group sequence.
  template<class Group_t>
  class SubclassGroupIterator
  {
  public:
    SubclassGroupIterator (const Graphic3d_SequenceOfGroup& theGroups) : myIter (theGroups) {}
    Standard_Boolean More() const  { return myIter.More(); }
    void Next()                    { myIter.Next(); }
    const Group_t*   Value() const { return (const Group_t* )(myIter.Value().get()); }
    Group_t*         ChangeValue() { return (Group_t* )(myIter.ChangeValue().get()); }
  private:
    Graphic3d_SequenceOfGroup::Iterator myIter;
  };

public:

  //! @return graphic driver created this structure
  const Handle(Graphic3d_GraphicDriver)& GraphicDriver() const
  {
    return myGraphicDriver;
  }

  //! @return graphic groups
  const Graphic3d_SequenceOfGroup& Groups() const
  {
    return myGroups;
  }

  //! Return transformation.
  const Handle(Geom_Transformation)& Transformation() const { return myTrsf; }

  //! Assign transformation.
  virtual void SetTransformation (const Handle(Geom_Transformation)& theTrsf) { myTrsf = theTrsf; }

  //! Return transformation persistence.
  const Handle(Graphic3d_TransformPers)& TransformPersistence() const { return myTrsfPers; }

  //! Set transformation persistence.
  virtual void SetTransformPersistence (const Handle(Graphic3d_TransformPers)& theTrsfPers) { myTrsfPers = theTrsfPers; }

  //! @return associated clip planes
  const Handle(Graphic3d_SequenceOfHClipPlane)& ClipPlanes() const
  {
    return myClipPlanes;
  }

  //! Pass clip planes to the associated graphic driver structure
  void SetClipPlanes (const Handle(Graphic3d_SequenceOfHClipPlane)& thePlanes) { myClipPlanes = thePlanes; }

  //! @return bounding box of this presentation
  const Graphic3d_BndBox3d& BoundingBox() const
  {
    return myBndBox;
  }

  //! @return bounding box of this presentation
  //! without transformation matrix applied
  Graphic3d_BndBox3d& ChangeBoundingBox()
  {
    return myBndBox;
  }

  //! Return structure visibility flag
  bool IsVisible() const { return visible != 0; }

  //! Return structure visibility considering both View Affinity and global visibility state.
  bool IsVisible (const Standard_Integer theViewId) const
  {
    return visible != 0
        && (ViewAffinity.IsNull()
         || ViewAffinity->IsVisible (theViewId));
  }

  //! Set z layer ID to display the structure in specified layer
  virtual void SetZLayer (const Graphic3d_ZLayerId theLayerIndex) { myZLayer = theLayerIndex; }

  //! Get z layer ID
  Graphic3d_ZLayerId ZLayer() const { return myZLayer; }

  //! Returns valid handle to highlight style of the structure in case if
  //! highlight flag is set to true
  const Handle(Graphic3d_PresentationAttributes)& HighlightStyle() const { return myHighlightStyle; }

public:

  //! Returns FALSE if the structure hits the current view volume, otherwise returns TRUE.
  Standard_Boolean IsCulled() const { return myIsCulled; }

  //! Marks structure as culled/not culled - note that IsAlwaysRendered() is ignored here!
  void SetCulled (Standard_Boolean theIsCulled) const { myIsCulled = theIsCulled; }

  //! Marks structure as overlapping the current view volume one.
  //! The method is called during traverse of BVH tree.
  void MarkAsNotCulled() const { myIsCulled = Standard_False; }

  //! Returns whether check of object's bounding box clipping is enabled before drawing of object; TRUE by default.
  Standard_Boolean BndBoxClipCheck() const { return myBndBoxClipCheck; }

  //! Enable/disable check of object's bounding box clipping before drawing of object.
  void SetBndBoxClipCheck(Standard_Boolean theBndBoxClipCheck) { myBndBoxClipCheck = theBndBoxClipCheck; }

  //! Checks if the structure should be included into BVH tree or not.
  Standard_Boolean IsAlwaysRendered() const
  {
    return IsInfinite
        || IsForHighlight
        || IsMutable
        || Is2dText
        || (!myTrsfPers.IsNull() && myTrsfPers->IsTrihedronOr2d());
  }

public:

  //! Update structure visibility state
  virtual void OnVisibilityChanged() = 0;

  //! Clear graphic data
  virtual void Clear() = 0;

  //! Connect other structure to this one
  virtual void Connect    (Graphic3d_CStructure& theStructure) = 0;

  //! Disconnect other structure to this one
  virtual void Disconnect (Graphic3d_CStructure& theStructure) = 0;

  //! Highlights structure with the given style
  virtual void GraphicHighlight (const Handle(Graphic3d_PresentationAttributes)& theStyle) = 0;

  //! Unhighlights the structure and invalidates pointer to structure's highlight
  //! style
  virtual void GraphicUnhighlight() = 0;

  //! Create shadow link to this structure
  virtual Handle(Graphic3d_CStructure) ShadowLink (const Handle(Graphic3d_StructureManager)& theManager) const = 0;

  //! Create new group within this structure
  virtual Handle(Graphic3d_Group) NewGroup (const Handle(Graphic3d_Structure)& theStruct) = 0;

  //! Remove group from this structure
  virtual void RemoveGroup (const Handle(Graphic3d_Group)& theGroup) = 0;

  //! Update render transformation matrix.
  virtual void updateLayerTransformation() {}

public:

  int                      Id;
  Graphic3d_ZLayerId       myZLayer;
  int                      Priority;
  int                      PreviousPriority;

  int   ContainsFacet;

  Handle(Graphic3d_ViewAffinity) ViewAffinity; //!< view affinity mask

  unsigned IsInfinite     : 1;
  unsigned stick          : 1; //!< displaying state - should be set when structure has been added to scene graph (but can be in hidden state)
  unsigned highlight      : 1;
  unsigned visible        : 1; //!< visibility flag - can be used to suppress structure while leaving it in the scene graph
  unsigned HLRValidation  : 1;
  unsigned IsForHighlight : 1;
  unsigned IsMutable      : 1;
  unsigned Is2dText       : 1;

protected:

  //! Create empty structure.
  Standard_EXPORT Graphic3d_CStructure (const Handle(Graphic3d_StructureManager)& theManager);

protected:

  Handle(Graphic3d_GraphicDriver) myGraphicDriver;
  Graphic3d_SequenceOfGroup       myGroups;
  Graphic3d_BndBox3d              myBndBox;
  Handle(Geom_Transformation)     myTrsf;
  Handle(Graphic3d_TransformPers) myTrsfPers;
  Handle(Graphic3d_SequenceOfHClipPlane) myClipPlanes;
  Handle(Graphic3d_PresentationAttributes) myHighlightStyle; //! Current highlight style; is set only if highlight flag is true

  mutable Standard_Boolean myIsCulled; //!< A status specifying is structure needs to be rendered after BVH tree traverse
  Standard_Boolean myBndBoxClipCheck;  //!< Flag responsible for checking of bounding box clipping before drawing of object

public:

  DEFINE_STANDARD_RTTIEXT(Graphic3d_CStructure,Standard_Transient) // Type definition

};

DEFINE_STANDARD_HANDLE (Graphic3d_CStructure, Standard_Transient)

#endif // _Graphic3d_CStructure_HeaderFile