0031757: Visualization - Prebuild BVH for Select3D_SensitiveEntity in separate threads

- Added a new mode in SelectMgr_ViewerSelector for computing BVH for Select3D_SensitiveEntity in background which can be activated via method SelectMgr_ViewerSelector::SetToPrebuildBVH(). Default behavior has not been changed.
- New class SelectMgr_BVHThreadPool manages background processing of BVH building queue.
- Added Select3D_SensitiveEntity::ToBuildBVH() method that checks if BVH (if it used) is in invalidated state. Defined this method for all standard classes inherited from Select3D_SensitiveEntity.

src/Select3D/Select3D_SensitiveBox.hxx

@@ -70,6 +70,9 @@ public:
   //! transformation is set, it will be applied
   Standard_EXPORT virtual Select3D_BndBox3d BoundingBox() Standard_OVERRIDE;
 
+  //! Returns TRUE if BVH tree is in invalidated state
+  virtual Standard_Boolean ToBuildBVH() const Standard_OVERRIDE { return Standard_False; }
+
   //! Dumps the content of me into the stream
   Standard_EXPORT virtual void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const Standard_OVERRIDE;
 

src/Select3D/Select3D_SensitiveCircle.cxx

@@ -191,6 +191,20 @@ void Select3D_SensitiveCircle::BVH()
   }
 }
 
+//=======================================================================
+// function : ToBuildBVH
+// purpose  : 
+//=======================================================================
+Standard_Boolean Select3D_SensitiveCircle::ToBuildBVH() const
+{
+  if (mySensType != Select3D_TOS_BOUNDARY)
+  {
+    return Standard_False;
+  }
+
+  return Select3D_SensitivePoly::ToBuildBVH();
+}
+
 //=======================================================================
 // function : Matches
 // purpose  : Checks whether the circle overlaps current selecting volume

src/Select3D/Select3D_SensitiveCircle.hxx

@@ -81,6 +81,9 @@ public:
   //! Builds BVH tree for a circle's edge segments if needed
   Standard_EXPORT virtual void BVH() Standard_OVERRIDE;
 
+  //! Returns TRUE if BVH tree is in invalidated state
+  Standard_EXPORT virtual Standard_Boolean ToBuildBVH() const Standard_OVERRIDE;
+
 protected:
 
   //! Calculates distance from the 3d projection of used-picked screen point

src/Select3D/Select3D_SensitiveEntity.hxx

@@ -81,6 +81,9 @@ public:
   //! Builds BVH tree for a sensitive if needed
   virtual void BVH() {}
 
+  //! Returns TRUE if BVH tree is in invalidated state
+  virtual Standard_Boolean ToBuildBVH() const { return Standard_True; }
+
   //! Clears up all resources and memory
   virtual void Clear() { Set (Handle(SelectMgr_EntityOwner)()); }
 

src/Select3D/Select3D_SensitiveFace.hxx

@@ -70,6 +70,9 @@ public:
   //! Builds BVH tree for the face
   Standard_EXPORT virtual void BVH() Standard_OVERRIDE;
 
+  //! Returns TRUE if BVH tree is in invalidated state
+  virtual Standard_Boolean ToBuildBVH() const Standard_OVERRIDE { return myFacePoints->ToBuildBVH(); }
+
   //! Returns the amount of sub-entities (points or planar convex polygons)
   Standard_EXPORT virtual Standard_Integer NbSubElements() const Standard_OVERRIDE;
 

src/Select3D/Select3D_SensitivePoint.hxx

@@ -50,6 +50,9 @@ public:
   //! transformation is set, it will be applied
   Standard_EXPORT virtual Select3D_BndBox3d BoundingBox() Standard_OVERRIDE;
 
+  //! Returns TRUE if BVH tree is in invalidated state
+  virtual Standard_Boolean ToBuildBVH() const Standard_OVERRIDE { return Standard_False; }
+
   //! Dumps the content of me into the stream
   Standard_EXPORT virtual void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const Standard_OVERRIDE;
 

src/Select3D/Select3D_SensitiveSegment.hxx

@@ -62,6 +62,9 @@ public:
   //! transformation is set, it will be applied
   Standard_EXPORT virtual Select3D_BndBox3d BoundingBox() Standard_OVERRIDE;
 
+  //! Returns TRUE if BVH tree is in invalidated state
+  virtual Standard_Boolean ToBuildBVH() const Standard_OVERRIDE { return Standard_False; }
+
 public:
 
   //! changes the start Point of the Segment;

src/Select3D/Select3D_SensitiveSet.hxx

@@ -75,6 +75,9 @@ public:
   //! but element by element
   Standard_EXPORT virtual void BVH() Standard_OVERRIDE;
 
+  //! Returns TRUE if BVH tree is in invalidated state
+  virtual Standard_Boolean ToBuildBVH() const Standard_OVERRIDE { return myContent.IsDirty(); }
+
   //! Sets the method (builder) used to construct BVH.
   void SetBuilder (const Handle(Select3D_BVHBuilder3d)& theBuilder) { myContent.SetBuilder (theBuilder); }
 

src/Select3D/Select3D_SensitiveTriangle.hxx

@@ -62,6 +62,9 @@ public:
   //! will be applied
   Standard_EXPORT virtual Select3D_BndBox3d BoundingBox() Standard_OVERRIDE;
 
+  //! Returns TRUE if BVH tree is in invalidated state
+  virtual Standard_Boolean ToBuildBVH() const Standard_OVERRIDE { return Standard_False; }
+
   //! Returns the amount of points
   virtual Standard_Integer NbSubElements() const Standard_OVERRIDE { return 3; }