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 // Copyright (c) 2011-2019 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_Layer_HeaderFile
 #define _Graphic3d_Layer_HeaderFile
 
 #include <Graphic3d_BvhCStructureSet.hxx>
 #include <Graphic3d_BvhCStructureSetTrsfPers.hxx>
 #include <Graphic3d_DisplayPriority.hxx>
 #include <Graphic3d_ZLayerId.hxx>
 #include <Graphic3d_ZLayerSettings.hxx>
 #include <Graphic3d_RenderingParams.hxx>
 #include <NCollection_Array1.hxx>
 #include <NCollection_IndexedMap.hxx>
 
 #include <array>
 
 //! Defines index map of structures.
 
 //! Defines array of indexed maps of structures.
 typedef std::array<NCollection_IndexedMap<const Graphic3d_CStructure*>,
                    Graphic3d_DisplayPriority_NB>
   Graphic3d_ArrayOfIndexedMapOfStructure;
 
 class Graphic3d_CullingTool;
 
 //! Presentations list sorted within priorities.
 class Graphic3d_Layer : public Standard_Transient
 {
   DEFINE_STANDARD_RTTIEXT(Graphic3d_Layer, Standard_Transient)
 public:
   //! Initializes associated priority list and layer properties
   Standard_EXPORT Graphic3d_Layer(Graphic3d_ZLayerId                theId,
                                   const occ::handle<BVH_Builder3d>& theBuilder);
 
   //! Destructor.
   Standard_EXPORT ~Graphic3d_Layer() override;
 
   //! Return layer id.
   Graphic3d_ZLayerId LayerId() const { return myLayerId; }
 
   //! Returns BVH tree builder for frustum culling.
   const occ::handle<BVH_Builder3d>& FrustumCullingBVHBuilder() const
   {
     return myBVHPrimitivesTrsfPers.Builder();
   }
 
   //! Assigns BVH tree builder for frustum culling.
   void SetFrustumCullingBVHBuilder(const occ::handle<BVH_Builder3d>& theBuilder)
   {
     myBVHPrimitivesTrsfPers.SetBuilder(theBuilder);
   }
 
   //! Return true if layer was marked with immediate flag.
   bool IsImmediate() const { return myLayerSettings.IsImmediate(); }
 
   //! Returns settings of the layer object.
   const Graphic3d_ZLayerSettings& LayerSettings() const { return myLayerSettings; };
 
   //! Sets settings of the layer object.
   Standard_EXPORT void SetLayerSettings(const Graphic3d_ZLayerSettings& theSettings);
 
   Standard_EXPORT void Add(const Graphic3d_CStructure* theStruct,
                            Graphic3d_DisplayPriority   thePriority,
                            bool                        isForChangePriority = false);
 
   //! Remove structure and returns its priority, if the structure is not found, method returns
   //! negative value
   Standard_EXPORT bool Remove(const Graphic3d_CStructure* theStruct,
                               Graphic3d_DisplayPriority&  thePriority,
                               bool                        isForChangePriority = false);
 
   //! @return the number of structures
   int NbStructures() const { return myNbStructures; }
 
   //! Number of NOT culled structures in the layer.
   int NbStructuresNotCulled() const { return myNbStructuresNotCulled; }
 
   //! Returns the number of available priority levels
   int NbPriorities() const { return Graphic3d_DisplayPriority_NB; }
 
   //! Append layer of acceptable type (with similar number of priorities or less).
   //! Returns false if the list can not be accepted.
   Standard_EXPORT bool Append(const Graphic3d_Layer& theOther);
 
   //! Returns array of structures.
   const Graphic3d_ArrayOfIndexedMapOfStructure& ArrayOfStructures() const { return myArray; }
 
   //! Returns structures for specified priority.
   const NCollection_IndexedMap<const Graphic3d_CStructure*>& Structures(
     Graphic3d_DisplayPriority thePriority) const
   {
     return myArray[thePriority];
   }
 
   //! Marks BVH tree for given priority list as dirty and
   //! marks primitive set for rebuild.
   Standard_EXPORT void InvalidateBVHData();
 
   //! Marks cached bounding box as obsolete.
   void InvalidateBoundingBox() const
   {
     myIsBoundingBoxNeedsReset[0] = myIsBoundingBoxNeedsReset[1] = true;
   }
 
   //! Returns layer bounding box.
   //! @param theViewId             view index to consider View Affinity in structure
   //! @param theCamera             camera definition
   //! @param theWindowWidth        viewport width  (for applying transformation-persistence)
   //! @param theWindowHeight       viewport height (for applying transformation-persistence)
   //! @param theToIncludeAuxiliary consider also auxiliary presentations (with infinite flag or with
   //! trihedron transformation persistence)
   //! @return computed bounding box
   Standard_EXPORT Bnd_Box BoundingBox(int                                  theViewId,
                                       const occ::handle<Graphic3d_Camera>& theCamera,
                                       int                                  theWindowWidth,
                                       int                                  theWindowHeight,
                                       bool theToIncludeAuxiliary) const;
 
   //! Returns zoom-scale factor.
   Standard_EXPORT double considerZoomPersistenceObjects(
     int                                  theViewId,
     const occ::handle<Graphic3d_Camera>& theCamera,
     int                                  theWindowWidth,
     int                                  theWindowHeight) const;
 
   //! Update culling state - should be called before rendering.
   //! Traverses through BVH tree to determine which structures are in view volume.
   Standard_EXPORT void UpdateCulling(
     int                                             theViewId,
     const Graphic3d_CullingTool&                    theSelector,
     const Graphic3d_RenderingParams::FrustumCulling theFrustumCullingState);
 
   //! Returns TRUE if layer is empty or has been discarded entirely by culling test.
   bool IsCulled() const { return myNbStructuresNotCulled == 0; }
 
   //! Returns number of transform persistence objects.
   int NbOfTransformPersistenceObjects() const { return myBVHPrimitivesTrsfPers.Size(); }
 
 public:
   //! Returns set of Graphic3d_CStructures structures for building BVH tree.
   const Graphic3d_BvhCStructureSet& CullableStructuresBVH() const { return myBVHPrimitives; }
 
   //! Returns set of transform persistent Graphic3d_CStructures for building BVH tree.
   const Graphic3d_BvhCStructureSetTrsfPers& CullableTrsfPersStructuresBVH() const
   {
     return myBVHPrimitivesTrsfPers;
   }
 
   //! Returns indexed map of always rendered structures.
   const NCollection_IndexedMap<const Graphic3d_CStructure*>& NonCullableStructures() const
   {
     return myAlwaysRenderedMap;
   }
 
   //! Dumps the content of me into the stream
   Standard_EXPORT void DumpJson(Standard_OStream& theOStream, int theDepth = -1) const;
 
 protected:
   //! Updates BVH trees if their state has been invalidated.
   Standard_EXPORT void updateBVH() const;
 
 private:
   //! Array of Graphic3d_CStructures by priority rendered in layer.
   Graphic3d_ArrayOfIndexedMapOfStructure myArray;
 
   //! Overall number of structures rendered in the layer.
   int myNbStructures;
 
   //! Number of NOT culled structures in the layer.
   int myNbStructuresNotCulled;
 
   //! Layer setting flags.
   Graphic3d_ZLayerSettings myLayerSettings;
 
   //! Layer id.
   Graphic3d_ZLayerId myLayerId;
 
   //! Set of Graphic3d_CStructures structures for building BVH tree.
   mutable Graphic3d_BvhCStructureSet myBVHPrimitives;
 
   //! Set of transform persistent Graphic3d_CStructures for building BVH tree.
   mutable Graphic3d_BvhCStructureSetTrsfPers myBVHPrimitivesTrsfPers;
 
   //! Indexed map of always rendered structures.
   mutable NCollection_IndexedMap<const Graphic3d_CStructure*> myAlwaysRenderedMap;
 
   //! Is needed for implementation of stochastic order of BVH traverse.
   bool myBVHIsLeftChildQueuedFirst;
 
   //! Defines if the primitive set for BVH is outdated.
   mutable bool myIsBVHPrimitivesNeedsReset;
 
   //! Defines if the cached bounding box is outdated.
   mutable bool myIsBoundingBoxNeedsReset[2];
 
   //! Cached layer bounding box.
   mutable Bnd_Box myBoundingBox[2];
 };
 
 #endif // _Graphic3d_Layer_HeaderFile

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