vtkStructuredAMRGridConnectivity.h

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/*=========================================================================

 Program:   Visualization Toolkit
 Module:    vtkStructuredAMRGridConnectivity.h

 Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
 All rights reserved.
 See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

 This software is distributed WITHOUT ANY WARRANTY; without even
 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 PURPOSE.  See the above copyright notice for more information.

 =========================================================================*/
#ifndef vtkStructuredAMRGridConnectivity_h
#define vtkStructuredAMRGridConnectivity_h

#include "vtkFiltersGeometryModule.h" // For export macro
#include "vtkAbstractGridConnectivity.h"

#include "vtkStructuredAMRNeighbor.h" // For vtkStructuredAMRNeighbor def.


// C++ includes
#include <map>     // For STL map
#include <ostream> // For STL stream
#include <set>     // For STL set
#include <vector>  // For STL vector

class VTKFILTERSGEOMETRY_EXPORT vtkStructuredAMRGridConnectivity :
  public vtkAbstractGridConnectivity
{
public:
  static vtkStructuredAMRGridConnectivity* New();
  vtkTypeMacro(vtkStructuredAMRGridConnectivity, vtkAbstractGridConnectivity);
  void PrintSelf(ostream& os, vtkIndent indent ) override;

  void Initialize(
      const unsigned int NumberOfLevels,
      const unsigned int N, const int RefinementRatio=-1);

  void ComputeNeighbors() override;

  void CreateGhostLayers(const int N=1) override;

  virtual void RegisterGrid(
        const int gridIdx, const int level, const int refinementRatio,
        int extents[6],
        vtkUnsignedCharArray* nodesGhostArray,
        vtkUnsignedCharArray* cellGhostArray,
        vtkPointData* pointData,
        vtkCellData* cellData,
        vtkPoints* gridNodes);

  virtual void RegisterGrid(
      const int gridIdx, const int level, int extents[6],
      vtkUnsignedCharArray* nodesGhostArray,
      vtkUnsignedCharArray* cellGhostArray,
      vtkPointData* pointData,
      vtkCellData* cellData,
      vtkPoints* gridNodes);


  vtkSetMacro(BalancedRefinement,bool);
  vtkGetMacro(BalancedRefinement,bool);


  vtkSetMacro(NodeCentered,bool);
  vtkGetMacro(NodeCentered,bool);


  vtkSetMacro(CellCentered,bool);
  vtkGetMacro(CellCentered,bool);

  int GetNumberOfNeighbors(const int gridID);

  void GetGhostedExtent(const int gridID, int ext[6]);

  vtkStructuredAMRNeighbor GetNeighbor(const int gridID, const int nei);

protected:
  vtkStructuredAMRGridConnectivity();
  ~vtkStructuredAMRGridConnectivity() override;

  void SetNumberOfGrids( const unsigned int N ) override;

  void CreateGhostedMaskArrays(const int gridID);

  void CreateGhostedExtent(const int gridID, const int N);

  void SetGhostedExtent(const int gridID, int ext[6]);

  void GetCoarsenedExtent(
      const int gridIdx, int fromLevel, int toLevel, int ext[6]);

  void GetRefinedExtent(
      const int gridIdx, int fromLevel, int toLevel, int ext[6]);

  void RefineExtent(
      int orient[3], int ndim, int fromLevel, int toLevel, int ext[6]);

  void GetCellRefinedExtent(
        int orient[3], int ndim,
        const int i, const int j, const int k,
        const int fromLevel, const int toLevel,
        int ext[6]);

  void CoarsenExtent(
      int orient[3], int ndim, int fromLevel, int toLevel, int ext[6]);

  void GetGridExtent( const int gridIdx, int ext[6] );

  int GetGridLevel( const int gridIdx );

  bool LevelExists( const int level );

  bool IsNodeInterior(
      const int i, const int j, const int k, int ext[6]);

  bool IsNodeWithinExtent(
      const int i, const int j, const int k, int ext[6]);

  bool IsNodeOnSharedBoundary(
        const int i, const int j, const int k,
        const int gridId,int gridExt[6]);

  bool IsNodeOnBoundaryOfExtent(
          const int i, const int j, const int k, int ext[6] );

  void InsertGridAtLevel( const int level, const int gridID);

  void ComputeNeighborSendAndRcvExtent(const int gridID, const int N);

  void ComputeWholeExtent();

  void GetWholeExtentAtLevel(const int level, int ext[6]);

  void EstablishNeighbors(const int i, const int j);

  void GetNodeOrientation(
      const int i, const int j, const int k,
      int gridExt[6], int nodeOrientation[3]);

  void GetOrientationVector(
      const int dataDescription, int orient[3], int &ndim);

  bool HasConstantRefinementRatio( );

  void SetRefinementRatioAtLevel( const int level, const int r);

  int GetRefinementRatioAtLevel(const int level);

  bool AreExtentsEqual(int ext1[6], int ext2[6] );

  void SetBlockTopology(const int gridID);

  int GetNumberOfConnectingBlockFaces( const int gridID );


  bool HasBlockConnection(const int gridID, const int blockDirection)
  {
    // Sanity check
    assert("pre: gridID is out-of-bounds" &&
          (gridID >=0) && (gridID < static_cast<int>(this->NumberOfGrids)));
    assert("pre: BlockTopology has not been properly allocated" &&
          (this->NumberOfGrids == this->BlockTopology.size()));
    assert("pre: blockDirection is out-of-bounds" &&
          (blockDirection >= 0) && (blockDirection < 6) );
    bool status = false;
    if( this->BlockTopology[ gridID ] & (1 << blockDirection) )
    {
      status = true;
    }
    return( status );
  }

  void RemoveBlockConnection(const int gridID, const int blockDirection);

  void AddBlockConnection(const int gridID, const int blockDirection);

  void ClearBlockConnections( const int gridID );

  virtual void MarkNodeProperty(
      const int gridId, const int i, const int j, const int k,
      int gridExt[6], int wholeExt[6],
      unsigned char &p);

  virtual void FillNodesGhostArray(
      const int gridId, vtkUnsignedCharArray* nodesArray);

  virtual void FillCellsGhostArray(
      const int gridId, vtkUnsignedCharArray* cellArray);

  void FillGhostArrays(
            const int gridId,
            vtkUnsignedCharArray* nodesArray,
            vtkUnsignedCharArray* cellsArray ) override;

  vtkStructuredAMRNeighbor GetAMRNeighbor(
      const int i, const int iLevel, int next1[6],
      const int j, const int jLevel, int next2[6],
      const int normalizedLevel,
      const int levelDiff,
      vtkStructuredNeighbor &nei);

  void ComputeAMRNeighborOverlapExtents(
      const int iLevel, const int jLevel, const int normalizedLevel,
      const vtkStructuredNeighbor &nei,
      int orient[3], int ndim,
      int gridOverlapExtent[6],
      int neiOverlapExtent[6]);

  int Get1DOrientation(
      const int idx, const int ExtentLo, const int ExtentHi,
      const int OnLo, const int OnHi, const int NotOnBoundary);

  void PrintExtent(std::ostream& os, int ext[6]);

  void InitializeGhostData( const int gridID );

  void TransferRegisteredDataToGhostedData( const int gridID );

  void TransferLocalNodeCenteredNeighborData(
          const int gridID, vtkStructuredAMRNeighbor &nei);

  void GetLocalCellCentersFromCoarserLevel(
          const int gridID, vtkStructuredAMRNeighbor &nei);

  void GetLocalCellCentersFromFinerLevel(
          const int gridID, vtkStructuredAMRNeighbor &nei);

  void GetLocalCellCentersAtSameLevel(
          const int gridID, vtkStructuredAMRNeighbor &nei);

  void TransferLocalCellCenteredNeighborData(
          const int gridID, vtkStructuredAMRNeighbor &nei);

  void TransferLocalNeighborData(
      const int gridID, vtkStructuredAMRNeighbor &nei);

  virtual void TransferGhostDataFromNeighbors(const int gridID);

  void AverageFieldData(
      vtkFieldData *source, vtkIdType *sourceIds, const int N,
      vtkFieldData *target, vtkIdType targetIdx);

  void CopyFieldData(
      vtkFieldData *source, vtkIdType sourceIdx,
      vtkFieldData *target, vtkIdType targetIdx);


  unsigned int NumberOfLevels; // The total number of levels;
  int DataDimension;    // The dimension of the data, i.e. 2 or 3
  int DataDescription;  // The data description, i.e., VTK_XY_PLANE, etc.
  int WholeExtent[6];   // The whole extent w.r.t. to the root level, level 0.
  int MaxLevel;         // The max level of the AMR hierarchy
  int RefinementRatio;  // The refinement ratio, set in the initialization,iff,
                        // a constant refinement ratio is used. A value of -1
                        // indicates that the refinement ratio is not constant
                        // and the RefinementRatios vector is used instead.

  bool NodeCentered;  // Indicates if the data is node-centered
  bool CellCentered;  // Indicates if the data is cell-centered

  bool BalancedRefinement; // If Balanced refinement is true, then adjacent
                            // grids in the hierarchy can only differ by one
                            // level.

  // AMRHierarchy stores the set of grid Ids in [0,N] for each level
  std::map< int, std::set<int> > AMRHierarchy;

  // For each grid, [0,N] store the grid extents,level, and list of neighbors
  std::vector< int > GridExtents; // size of this vector is 6*N
  std::vector< int > GhostedExtents; // size of this vector is 6*N
  std::vector< unsigned char > BlockTopology; // size of this vector is N
  std::vector< int > GridLevels;  // size of this vector is N
  std::vector< std::vector<vtkStructuredAMRNeighbor> > Neighbors;

  // For each grid, [0,N], store the donor level,grid and cell information, a
  // DonorLevel of -1 indicates that the cell is not receiving any information
  // from a donor.
  std::vector< std::vector<int> > CellCenteredDonorLevel;


  // RefinementRatios stores the refinement ratio at each level, this vector
  // is used only when the refinement ratio varies across levels
  std::vector< int > RefinementRatios;

private:
   vtkStructuredAMRGridConnectivity(const vtkStructuredAMRGridConnectivity&) = delete;
   void operator=(const vtkStructuredAMRGridConnectivity&) = delete;
};

//=============================================================================
//  INLINE METHODS
//=============================================================================

//------------------------------------------------------------------------------
inline int
vtkStructuredAMRGridConnectivity::GetNumberOfNeighbors(
    const int gridID)
{
  assert("pre: grid ID is out-of-bounds" &&
         (gridID >= 0) && (gridID < static_cast<int>(this->NumberOfGrids)));
  assert("pre: neighbors vector has not been properly allocated" &&
          (this->Neighbors.size()==this->NumberOfGrids));
  return( static_cast<int>(this->Neighbors[gridID].size()) );
}

//------------------------------------------------------------------------------
inline vtkStructuredAMRNeighbor
vtkStructuredAMRGridConnectivity::GetNeighbor(
      const int gridID, const int nei)
{
  assert("pre: grid ID is out-of-bounds" &&
         (gridID >= 0) && (gridID < static_cast<int>(this->NumberOfGrids)));
  assert("pre: neighbors vector has not been properly allocated" &&
         (this->Neighbors.size()==this->NumberOfGrids));
  assert("pre: nei index is out-of-bounds" &&
         (nei >= 0) &&
         (nei < static_cast<int>(this->Neighbors[gridID].size())));
  return( this->Neighbors[gridID][nei] );
}

//------------------------------------------------------------------------------
inline int
vtkStructuredAMRGridConnectivity::Get1DOrientation(
    const int idx, const int ExtentLo, const int ExtentHi,
    const int OnLo, const int OnHi, const int NotOnBoundary)
{
  if( idx == ExtentLo )
  {
      return OnLo;
  }
    else if( idx == ExtentHi )
    {
      return OnHi;
    }
    return NotOnBoundary;
}

//------------------------------------------------------------------------------
inline
int vtkStructuredAMRGridConnectivity::GetNumberOfConnectingBlockFaces(
    const int gridID )
{
  // Sanity check
  assert("pre: gridID is out-of-bounds" &&
        (gridID >=0) && (gridID < static_cast<int>(this->NumberOfGrids)));
  assert("pre: BlockTopology has not been properly allocated" &&
        (this->NumberOfGrids == this->BlockTopology.size()));

  int count = 0;
  for( int i=0; i < 6; ++i )
  {
    if( this->HasBlockConnection( gridID, i ) )
    {
      ++count;
    }
  }
  assert( "post: count must be in [0,5]" && (count >=0 && count <= 6) );
  return( count );
}

//------------------------------------------------------------------------------
inline void vtkStructuredAMRGridConnectivity::RemoveBlockConnection(
    const int gridID, const int blockDirection )
{
  // Sanity check
  assert("pre: gridID is out-of-bounds" &&
        (gridID >=0) && (gridID < static_cast<int>(this->NumberOfGrids)));
  assert("pre: BlockTopology has not been properly allocated" &&
        (this->NumberOfGrids == this->BlockTopology.size()));
  assert("pre: blockDirection is out-of-bounds" &&
        (blockDirection >= 0) && (blockDirection < 6) );

  this->BlockTopology[ gridID ] &= ~(1 << blockDirection);
}

//------------------------------------------------------------------------------
inline void vtkStructuredAMRGridConnectivity::AddBlockConnection(
    const int gridID, const int blockDirection )
{
  // Sanity check
  assert("pre: gridID is out-of-bounds" &&
        (gridID >=0) && (gridID < static_cast<int>(this->NumberOfGrids)));
  assert("pre: BlockTopology has not been properly allocated" &&
        (this->NumberOfGrids == this->BlockTopology.size()));
  assert("pre: blockDirection is out-of-bounds" &&
        (blockDirection >= 0) && (blockDirection < 6) );
  this->BlockTopology[ gridID ] |= (1 << blockDirection);
}

//------------------------------------------------------------------------------
inline void vtkStructuredAMRGridConnectivity::ClearBlockConnections(
    const int gridID )
{
  // Sanity check
  assert("pre: gridID is out-of-bounds" &&
        (gridID >=0) && (gridID < static_cast<int>(this->NumberOfGrids)));
  assert("pre: BlockTopology has not been properly allocated" &&
        (this->NumberOfGrids == this->BlockTopology.size()));
  for( int i=0; i < 6; ++i )
  {
    this->RemoveBlockConnection( gridID, i );
  } // END for all block directions
}

//------------------------------------------------------------------------------
inline
bool vtkStructuredAMRGridConnectivity::AreExtentsEqual(
        int ext1[6], int ext2[6])
{
  for( int i=0; i < 6; ++i )
  {
    if( ext1[i] != ext2[i] )
    {
      return false;
    }
  } // END for
  return true;
}

//------------------------------------------------------------------------------
inline
void vtkStructuredAMRGridConnectivity::PrintExtent(
      std::ostream& os, int ext[6])
{
  for( int i=0; i < 6; i+=2 )
  {
    os << "[";
    os << ext[i]   << " ";
    os << ext[i+1] << "] ";
  } // END for
}

//------------------------------------------------------------------------------
inline
int vtkStructuredAMRGridConnectivity::GetGridLevel(const int gridIdx)
{
  assert("pre: grid Index is out-of-bounds!" &&
         (gridIdx < static_cast<int>(this->NumberOfGrids)));
  assert("pre: grid levels vector has not been allocated" &&
         (this->GridLevels.size()==this->NumberOfGrids) );
  return( this->GridLevels[gridIdx] );
}

//------------------------------------------------------------------------------
inline
void vtkStructuredAMRGridConnectivity::SetRefinementRatioAtLevel(
    const int level, const int r)
{
  assert("pre: RefinementRatios vector is not propertly allocated" &&
         this->RefinementRatios.size()==this->NumberOfLevels);
  assert("pre: leve is out-of-bounds!" &&
         (level >= 0) &&
         (level < static_cast<int>(this->RefinementRatios.size())) );
  assert("pre: invalid refinement ratio" && (r >= 2) );

  this->RefinementRatios[ level ] = r;
}

//------------------------------------------------------------------------------
inline
int vtkStructuredAMRGridConnectivity::GetRefinementRatioAtLevel(
      const int level)
{
  assert( "pre: RefinementRatios vector is not propertly allocated" &&
          this->RefinementRatios.size()==this->NumberOfLevels);
  assert( "pre: leve is out-of-bounds!" &&
          (level >= 0) &&
          (level < static_cast<int>(this->RefinementRatios.size())));
  assert( "pre: refinement ratio for level has not been set" &&
          (this->RefinementRatios[ level ] >= 2) );

 return(this->RefinementRatios[level]);
}

//------------------------------------------------------------------------------
inline
bool vtkStructuredAMRGridConnectivity::HasConstantRefinementRatio()
{
  if( this->RefinementRatio < 2 )
  {
    return false;
  }
  return true;
}

//------------------------------------------------------------------------------
inline void vtkStructuredAMRGridConnectivity::GetGridExtent(
                      const int gridIdx, int ext[6])
{
  assert("pre: grid index is out-of-bounds" &&
         ( (gridIdx >= 0) &&
           (gridIdx < static_cast<int>(this->GridExtents.size()) ) ) );

  for( int i=0; i < 6; ++i )
  {
    ext[ i ] = this->GridExtents[ gridIdx*6+i ];
  }
}

//------------------------------------------------------------------------------
inline bool vtkStructuredAMRGridConnectivity::LevelExists(
              const int level )
{
  if( this->AMRHierarchy.find(level) != this->AMRHierarchy.end() )
  {
    return true;
  }
  return false;
}

//------------------------------------------------------------------------------
inline void vtkStructuredAMRGridConnectivity::InsertGridAtLevel(
      const int level, const int gridID )
{
  if( this->LevelExists( level ) )
  {
    this->AMRHierarchy[ level ].insert( gridID );
  }
  else
  {
    std::set<int> grids;
    grids.insert( gridID );
    this->AMRHierarchy[ level ] = grids;
  }
}

#endif /* VTKSTRUCTUREDAMRGRIDCONNECTIVITY_H_ */