BranchDecompositionBlock.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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//     Laboratory, U.S. Dept. of Energy nor the names of its contributors may be
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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_filter_scalar_topology_internal_BranchDecompositionBlock_h
#define vtk_m_filter_scalar_topology_internal_BranchDecompositionBlock_h
 
#include <vtkm/cont/ArrayHandleGroupVecVariable.h>
#include <vtkm/filter/scalar_topology/worklet/branch_decomposition/HierarchicalVolumetricBranchDecomposer.h>
 
namespace vtkm
{
namespace filter
{
namespace scalar_topology
{
namespace internal
{
 
struct BranchDecompositionBlock
{
  BranchDecompositionBlock(vtkm::Id localBlockNo,
                           int globalBlockId,
                           const vtkm::cont::DataSet& hierarchicalTreeDataSet);
 
  // Block metadata
  vtkm::Id LocalBlockNo;
  int GlobalBlockId; // TODO/FIXME: Check whether really needed. Possibly only during debugging
 
  // Data from hierarchical tree needed during reduction
  vtkm::cont::ArrayHandleGroupVecVariable<vtkm::cont::ArrayHandle<vtkm::Id>,
                                          vtkm::cont::ArrayHandle<vtkm::Id>>
    FirstSupernodePerIteration;
 
  // Decomposer used during reduction and output data set
  HierarchicalVolumetricBranchDecomposer VolumetricBranchDecomposer;
  vtkm::cont::ArrayHandle<vtkm::Id> BranchRoots;
 
  // Destroy function allowing DIY to own blocks and clean them up after use
  static void Destroy(void* b) { delete static_cast<BranchDecompositionBlock*>(b); }
};
 
} // namespace internal
} // namespace scalar_topology
} // namespace filter
} // namespace vtkm
#endif