vtk-m/vtkm/worklet/contourtree_augmented/contourtreemaker/ComputeHyperAndSuperStructure_PermuteArcs.h

//============================================================================
//  Copyright (c) Kitware, Inc.
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//
//  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.
//============================================================================
// 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.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
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// (1) Redistributions of source code must retain the above copyright notice, this
//     list of conditions and the following disclaimer.
//
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//     this list of conditions and the following disclaimer in the documentation
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// (3) Neither the name of the University of California, Lawrence Berkeley National
//     Laboratory, U.S. Dept. of Energy nor the names of its contributors may be
//     used to endorse or promote products derived from this software without
//     specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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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_augmented_contourtree_maker_inc_compute_hyper_and_super_structure_permute_arcs_h
#define vtk_m_worklet_contourtree_augmented_contourtree_maker_inc_compute_hyper_and_super_structure_permute_arcs_h

#include <vtkm/worklet/WorkletMapField.h>
#include <vtkm/worklet/contourtree_augmented/Types.h>

namespace vtkm
{
namespace worklet
{
namespace contourtree_augmented
{
namespace contourtree_maker_inc
{

// Worklet for settubg the super/hyperarcs fromm the permuted super/hyperarcs vector
class ComputeHyperAndSuperStructure_PermuteArcs : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(FieldIn permutedSHArcs,           // (input) active super/hyperarcs
                                WholeArrayIn shSortIndex,         // (input)
                                WholeArrayOut contourTreeSHArcs); // (output)
  typedef void ExecutionSignature(_1, InputIndex, _2, _3);
  using InputDomain = _1;

  // Default Constructor
  VTKM_EXEC_CONT
  ComputeHyperAndSuperStructure_PermuteArcs() {}

  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& sharc,
                            const vtkm::Id supernode,
                            const InFieldPortalType& shSortIndexPortal,
                            const OutFieldPortalType& contourTreeSHArcsPortal) const
  {
    if (NoSuchElement(sharc))
      contourTreeSHArcsPortal.Set(supernode, (vtkm::Id)NO_SUCH_ELEMENT);
    else
      contourTreeSHArcsPortal.Set(
        supernode, shSortIndexPortal.Get(MaskedIndex(sharc)) | (sharc & IS_ASCENDING));

    // In serial this worklet implements the following operation
    /*
      for (vtkm::Id supernode = 0; supernode < contourTree.Supernodes.size(); supernode++)
                { // per node
                vtkm::Id superarc = permutedSuperarcs[supernode];

                if (NoSuchElement(superarc))
                        contourTree.superarcs[supernode] = NO_SUCH_ELEMENT;
                else
                        contourTree.superarcs[supernode] = superSortIndex[MaskedIndex(superarc)] | (superarc & IS_ASCENDING);
                } // per node
      */
  }

}; // AugmentMergeTrees_InitNewJoinSplitIDAndSuperparents.h

} // namespace contourtree_maker_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm

#endif