MultiBlockContourTreeHelper.h

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//  PURPOSE.  See the above copyright notice for more information.
//============================================================================
// Copyright (c) 2018, The Regents of the University of California, through
// Lawrence Berkeley National Laboratory (subject to receipt of any required approvals
// from the U.S. Dept. of Energy).  All rights reserved.
//
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//     used to endorse or promote products derived from this software without
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//=============================================================================
//
//  This code is an extension of the algorithm presented in the paper:
//  Parallel Peak Pruning for Scalable SMP Contour Tree Computation.
//  Hamish Carr, Gunther Weber, Christopher Sewell, and James Ahrens.
//  Proceedings of the IEEE Symposium on Large Data Analysis and Visualization
//  (LDAV), October 2016, Baltimore, Maryland.
//
//  The PPP2 algorithm and software were jointly developed by
//  Hamish Carr (University of Leeds), Gunther H. Weber (LBNL), and
//  Oliver Ruebel (LBNL)
//==============================================================================
 
#ifndef vtk_m_worklet_contourtree_distributed_multiblockcontourtreehelper_h
#define vtk_m_worklet_contourtree_distributed_multiblockcontourtreehelper_h
 
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/meshtypes/ContourTreeMesh.h>
 
#include <vtkm/Types.h>
#include <vtkm/cont/BoundsCompute.h>
#include <vtkm/cont/BoundsGlobalCompute.h>
#include <vtkm/cont/ErrorFilterExecution.h>
#include <vtkm/cont/PartitionedDataSet.h>
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/data_set_mesh/IdRelabeler.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_distributed
{
 
//--- Helper class to help with the contstuction of the GlobalContourTree
class MultiBlockContourTreeHelper
{
public:
  VTKM_CONT
  MultiBlockContourTreeHelper(vtkm::Id3 blocksPerDim,
                              const vtkm::cont::ArrayHandle<vtkm::Id3>& localBlockIndices)
    : BlocksPerDimension(blocksPerDim)
    , LocalBlockIndices(localBlockIndices)
    , LocalContourTrees(static_cast<size_t>(localBlockIndices.GetNumberOfValues()))
    , LocalSortOrders(static_cast<size_t>(localBlockIndices.GetNumberOfValues()))
  {
  }
 
  VTKM_CONT
  MultiBlockContourTreeHelper(const vtkm::cont::PartitionedDataSet& input)
    : BlocksPerDimension(-1, -1, -1)
    , LocalBlockIndices()
    , LocalContourTrees(static_cast<size_t>(input.GetNumberOfPartitions()))
    , LocalSortOrders(static_cast<size_t>(input.GetNumberOfPartitions()))
  {
  }
 
  VTKM_CONT
  ~MultiBlockContourTreeHelper(void)
  {
    // FIXME: This shouldn't be necessary as arrays will get deleted anyway
    LocalContourTrees.clear();
    LocalSortOrders.clear();
  }
 
  inline static vtkm::Bounds GetGlobalBounds(const vtkm::cont::PartitionedDataSet& input)
  {
    // Get the  spatial bounds  of a multi -block  data  set
    vtkm::Bounds bounds = vtkm::cont::BoundsGlobalCompute(input);
    return bounds;
  }
 
  inline static vtkm::Bounds GetLocalBounds(const vtkm::cont::PartitionedDataSet& input)
  {
    // Get the spatial bounds  of a multi -block  data  set
    vtkm::Bounds bounds = vtkm::cont::BoundsCompute(input);
    return bounds;
  }
 
  inline vtkm::Id GetLocalNumberOfBlocks() const
  {
    return static_cast<vtkm::Id>(this->LocalContourTrees.size());
  }
 
  inline vtkm::Id GetGlobalNumberOfBlocks() const
  {
    return this->BlocksPerDimension[0] * this->BlocksPerDimension[1] * this->BlocksPerDimension[2];
  }
 
  // Used to compute the local contour tree mesh in after DoExecute. I.e., the function is
  // used in PostExecute to construct the initial set of local ContourTreeMesh blocks for
  // DIY. Subsequent construction of updated ContourTreeMeshes is handled separately.
  template <typename T>
  inline static vtkm::worklet::contourtree_augmented::ContourTreeMesh<T>*
  ComputeLocalContourTreeMesh(const vtkm::Id3 localBlockOrigin,
                              const vtkm::Id3 localBlockSize,
                              const vtkm::Id3 globalSize,
                              const vtkm::cont::ArrayHandle<T>& field,
                              const vtkm::worklet::contourtree_augmented::ContourTree& contourTree,
                              const vtkm::worklet::contourtree_augmented::IdArrayType& sortOrder,
                              unsigned int computeRegularStructure)
 
  {
    // compute the global mesh index and initalize the local contour tree mesh
    if (computeRegularStructure == 1)
    {
      // Compute the global mesh index
      vtkm::worklet::contourtree_augmented::IdArrayType localGlobalMeshIndex;
      auto transformedIndex = vtkm::cont::ArrayHandleTransform<
        vtkm::worklet::contourtree_augmented::IdArrayType,
        vtkm::worklet::contourtree_augmented::mesh_dem::IdRelabeler>(
        sortOrder,
        vtkm::worklet::contourtree_augmented::mesh_dem::IdRelabeler(
          localBlockOrigin, localBlockSize, globalSize));
      vtkm::cont::Algorithm::Copy(transformedIndex, localGlobalMeshIndex);
      // Compute the local contour tree mesh
      auto localContourTreeMesh = new vtkm::worklet::contourtree_augmented::ContourTreeMesh<T>(
        contourTree.Arcs, sortOrder, field, localGlobalMeshIndex);
      return localContourTreeMesh;
    }
    else if (computeRegularStructure == 2)
    {
      // Compute the global mesh index for the partially augmented contour tree. I.e., here we
      // don't need the global mesh index for all nodes, but only for the augmented nodes from the
      // tree. We, hence, permute the sortOrder by contourTree.augmentednodes and then compute the
      // GlobalMeshIndex by tranforming those indices with our IdRelabler
      vtkm::worklet::contourtree_augmented::IdArrayType localGlobalMeshIndex;
      vtkm::cont::ArrayHandlePermutation<vtkm::worklet::contourtree_augmented::IdArrayType,
                                         vtkm::worklet::contourtree_augmented::IdArrayType>
        permutedSortOrder(contourTree.Augmentnodes, sortOrder);
      auto transformedIndex = vtkm::cont::make_ArrayHandleTransform(
        permutedSortOrder,
        vtkm::worklet::contourtree_augmented::mesh_dem::IdRelabeler(
          localBlockOrigin, localBlockSize, globalSize));
      vtkm::cont::Algorithm::Copy(transformedIndex, localGlobalMeshIndex);
      // Compute the local contour tree mesh
      auto localContourTreeMesh = new vtkm::worklet::contourtree_augmented::ContourTreeMesh<T>(
        contourTree.Augmentnodes, contourTree.Augmentarcs, sortOrder, field, localGlobalMeshIndex);
      return localContourTreeMesh;
    }
    else
    {
      // We should not be able to get here
      throw vtkm::cont::ErrorFilterExecution(
        "Parallel contour tree requires at least parial boundary augmentation");
    }
  }
 
  vtkm::Id3 BlocksPerDimension;
  vtkm::cont::ArrayHandle<vtkm::Id3> LocalBlockIndices;
  std::vector<vtkm::worklet::contourtree_augmented::ContourTree> LocalContourTrees;
  std::vector<vtkm::worklet::contourtree_augmented::IdArrayType> LocalSortOrders;
}; // end MultiBlockContourTreeHelper
 
} // namespace contourtree_distributed
} // namespace worklet
} // namespace vtkm
 
#endif