CopyFirstHypernodePerIterationWorklet.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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// (1) Redistributions of source code must retain the above copyright notice, this
//     list of conditions and the following disclaimer.
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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_distributed_tree_grafter_copy_first_hypernode_per_iteration_worklet_h
#define vtk_m_worklet_contourtree_distributed_tree_grafter_copy_first_hypernode_per_iteration_worklet_h
 
 
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_distributed
{
namespace tree_grafter
{
 
class CopyFirstHypernodePerIterationWorklet : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(
    FieldIn
      newHypernode, // input. Set to ArrayHandleCounting<vtkm::Id>(nOldHypernodes, 1, nTotalHypernodes-nOldHypernodes)
    WholeArrayIn hierarchicalTreeHypernodes,     // input
    WholeArrayIn hierarchicalTreeWhichIteration, //input
    WholeArrayInOut
      hierarchicalTreeFirstHypernodePerIteration //output. should be set to hierarchicalTree.firstHypernodePerIteration[theRound]. // TODO: is it sufficient to use WholeArrayOut?
  );
 
  using ExecutionSignature = void(_1, _2, _3, _4);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  CopyFirstHypernodePerIterationWorklet(vtkm::Id numOldHypernodes)
    : NumOldHypernodes(numOldHypernodes)
  {
  }
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(
    const vtkm::Id& newHypernode,
    const InFieldPortalType& hierarchicalTreeHypernodesPortal,
    const InFieldPortalType& hierarchicalTreeWhichIterationPortal,
    const OutFieldPortalType& hierarchicalTreeFirstHypernodePerIterationPortal) const
  { // operator ()
    // per new hypernode
    vtkm::Id supernodeId = hierarchicalTreeHypernodesPortal.Get(newHypernode);
    vtkm::Id wasTransferred = vtkm::worklet::contourtree_augmented::MaskedIndex(
      hierarchicalTreeWhichIterationPortal.Get(supernodeId));
 
    // the first one defines the zeroth iteration: changes in iteration number define the others
    if (newHypernode == this->NumOldHypernodes)
    { // LHE
      hierarchicalTreeFirstHypernodePerIterationPortal.Set(0, newHypernode);
    } // LHE
    else if (wasTransferred !=
             vtkm::worklet::contourtree_augmented::MaskedIndex(
               hierarchicalTreeWhichIterationPortal.Get(
                 hierarchicalTreeHypernodesPortal.Get(newHypernode - 1))))
    { // other breakpoint
      hierarchicalTreeFirstHypernodePerIterationPortal.Set(wasTransferred, newHypernode);
    } // other breakpoint
 
    // In serial this worklet implements the following operation
    /*
    for (indexType newHypernode = nOldHypernodes; newHypernode < nTotalHypernodes; newHypernode++)
    { // per new hypernode
      indexType supernodeID = hierarchicalTree.hypernodes[newHypernode];
      indexType wasTransferred = maskedIndex(hierarchicalTree.whichIteration[supernodeID]);
 
      // the first one defines the zeroth iteration: changes in iteration number define the others
      if (newHypernode == nOldHypernodes)
        { // LHE
        hierarchicalTree.firstHypernodePerIteration[theRound][0] = newHypernode;
        } // LHE
      else if (wasTransferred != maskedIndex(hierarchicalTree.whichIteration[hierarchicalTree.hypernodes[newHypernode-1]]))
        { // other breakpoint
        hierarchicalTree.firstHypernodePerIteration[theRound][wasTransferred] = newHypernode;
        } // other breakpoint
    } // per new hypernode
    */
  } // operator ()
 
private:
  vtkm::Id NumOldHypernodes;
 
}; // CopyNewHypernodes
 
} // namespace tree_grafter
} // namespace contourtree_distributed
} // namespace worklet
} // namespace vtkm
 
#endif