SetHyperArcsWorklet.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.
//
// 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
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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_active_graph_set_hyper_arcs_worklet_h
#define vtk_m_worklet_contourtree_augmented_active_graph_set_hyper_arcs_worklet_h
 
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_augmented
{
namespace active_graph_inc
{
 
// Worklet for computing the sort indices from the sort order
class SetHyperArcsWorklet : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(
    WholeArrayInOut treeHypernodes, // (input/output) hypernodes of the tree
    WholeArrayOut treeHyperarcs,    // (output) tree hyperarcs
    WholeArrayIn graphHyperarcs,    // (input) hyperarcs from the portal
    WholeArrayIn graphSuperID);     // (input) active graph superID
  typedef void ExecutionSignature(_1, InputIndex, _2, _3, _4);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  SetHyperArcsWorklet() {}
 
  template <typename InFieldPortalType, typename InOutFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const InOutFieldPortalType& treeHypernodesPortal,
                            const vtkm::Id hypernode,
                            const OutFieldPortalType treeHyperarcsPortal,
                            const InFieldPortalType& graphHyperarcsPortal,
                            const InFieldPortalType& graphSuperIDPortal) const
  {
    // reset the hypernode ID to a supernode ID from a graph ID
    vtkm::Id graphID = treeHypernodesPortal.Get(hypernode);
    treeHypernodesPortal.Set(hypernode, graphSuperIDPortal.Get(graphID));
 
    // now retrieve the hyperarc destination
    vtkm::Id graphTarget = graphHyperarcsPortal.Get(graphID);
    // if it's the global minimum, copy
    if (NoSuchElement(graphTarget))
      treeHyperarcsPortal.Set(hypernode, (vtkm::Id)NO_SUCH_ELEMENT);
    // otherwise, look up the correct supernode ID
    else
      treeHyperarcsPortal.Set(hypernode, graphSuperIDPortal.Get(MaskedIndex(graphTarget)));
    // and reset the hypernode ID to a supernode ID
 
    // In serial this worklet implements the following operation
    /*
       for (indexType hypernode = 0; hypernode < nHypernodes; hypernode++)
        { // per hypernode
          // reset the hypernode ID to a supernode ID from a graph ID
          indexType graphID = tree.hypernodes[hypernode];
          tree.hypernodes[hypernode] = superID[graphID];
 
          // now retrieve the hyperarc destination
          indexType graphTarget = hyperarcs[graphID];
          // if it's the global minimum, copy
          if (NoSuchElement(graphTarget))
                  tree.hyperarcs[hypernode] = NO_SUCH_ELEMENT;
          // otherwise, look up the correct supernode ID
          else
                  tree.hyperarcs[hypernode] = superID[MaskedIndex(graphTarget)];
          // and reset the hypernode ID to a supernode ID
        } // per hypernode
      */
  }
 
}; // SetHyperArcsWorklet
 
} // namespace active_graph_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif