ComputeRegularStructure_SetArcs.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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//=============================================================================
//
//  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_regular_structure_set_arcs_h
#define vtk_m_worklet_contourtree_augmented_contourtree_maker_inc_compute_regular_structure_set_arcs_h
 
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_augmented
{
namespace contourtree_maker_inc
{
 
// Worklet for setting the arcs of the contour tree based on the sorted arcs
class ComputeRegularStructure_SetArcs : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(WholeArrayIn arcSorter,               // (input) arcSorter array
                                WholeArrayIn contourTreeSuperparents, // (input)
                                WholeArrayIn contourTreeSuperarcs,    // (input)
                                WholeArrayIn contourTreeSupernodes,   // (input)
                                WholeArrayOut contourTreeArcs);       // (output)
  typedef void ExecutionSignature(_1, InputIndex, _2, _3, _4, _5);
  using InputDomain = _1;
 
  vtkm::Id NumArcs; // contourTree.Arcs.GetNumberOfValues()
 
  // Default Constructor
  VTKM_EXEC_CONT
  ComputeRegularStructure_SetArcs(vtkm::Id numArcs)
    : NumArcs(numArcs)
  {
  }
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const InFieldPortalType& arcSorterPortal,
                            const vtkm::Id sortedNode,
                            const InFieldPortalType& contourTreeSuperparentsPortal,
                            const InFieldPortalType& contourTreeSuperarcsPortal,
                            const InFieldPortalType& contourTreeSupernodesPortal,
                            const OutFieldPortalType& contourTreeArcsPortal) const
  {
    // per node
    // convert arcSorter to node ID
    vtkm::Id nodeID = arcSorterPortal.Get(sortedNode);
    vtkm::Id superparent = contourTreeSuperparentsPortal.Get(nodeID);
 
    // the end element is always the last
    bool isLastOnSuperarc = false;
    if (sortedNode == NumArcs - 1)
    {
      isLastOnSuperarc = true;
    }
    // otherwise look for a change in the superparent
    else
    {
      isLastOnSuperarc =
        (superparent != contourTreeSuperparentsPortal.Get(arcSorterPortal.Get(sortedNode + 1)));
    }
 
    // if it's the last on the superarc
    if (isLastOnSuperarc)
    { // last on superarc
      // retrieve the superarc's far end
      vtkm::Id superarcEnd = contourTreeSuperarcsPortal.Get(superparent);
      // this only happens for the root of the tree, but is still needed
      if (NoSuchElement(superarcEnd))
      {
        contourTreeArcsPortal.Set(nodeID, (vtkm::Id)NO_SUCH_ELEMENT);
      }
      else
      {
        contourTreeArcsPortal.Set(nodeID,
                                  contourTreeSupernodesPortal.Get(MaskedIndex(superarcEnd)) |
                                    (superarcEnd & IS_ASCENDING));
      }
    } // last on superarc
    else
    { // not last on superarc
      vtkm::Id neighbour = arcSorterPortal.Get(sortedNode + 1);
      contourTreeArcsPortal.Set(nodeID, neighbour | ((neighbour > nodeID) ? IS_ASCENDING : 0));
    } // not last on superarc
 
 
    // In serial this worklet implements the following operation
    /*
      for (vtkm::Id sortedNode = 0; sortedNode < contourTree.Arcs.size(); sortedNode++)
        { // per node
          // convert arcSorter to node ID
          vtkm::Id nodeID = arcSorter[sortedNode];
          vtkm::Id superparent = contourTree.Superparents[nodeID];
 
          // the end element is always the last
          bool isLastOnSuperarc = false;
          if (sortedNode == contourTree.Arcs.size()-1)
             isLastOnSuperarc = true;
          // otherwise look for a change in the superparent
          else
             isLastOnSuperarc = (superparent != contourTree.Superparents[arcSorter[sortedNode + 1]]);
 
          // if it's the last on the superarc
          if (isLastOnSuperarc)
            { // last on superarc
              // retrieve the superarc's far end
              vtkm::Id superarcEnd = contourTree.superarcs[superparent];
              // this only happens for the root of the tree, but is still needed
              if (NoSuchElement(superarcEnd))
                contourTree.Arcs[nodeID] = NO_SUCH_ELEMENT;
              else
                contourTree.Arcs[nodeID] = contourTree.Supernodes[MaskedIndex(superarcEnd)] | (superarcEnd & IS_ASCENDING);
            } // last on superarc
          else
            { // not last on superarc
              vtkm::Id neighbour = arcSorter[sortedNode+1];
              contourTree.Arcs[nodeID] = neighbour | ((neighbour > nodeID) ? IS_ASCENDING : 0);
            } // not last on superarc
 
        } // per node
 
      */
  }
 
}; // ComputeRegularStructure_SetArcs
 
// Worklet for setting the arcs of the contour tree based on the sorted augmented nodes
class ComputeRegularStructure_SetAugmentArcs : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(WholeArrayIn arcSorter,               // (input) arcSorter array
                                WholeArrayIn contourTreeSuperparents, // (input)
                                WholeArrayIn contourTreeSuperarcs,    // (input)
                                WholeArrayIn contourTreeSupernodes,   // (input)
                                WholeArrayIn toCompressed,            // (input)
                                WholeArrayOut contourTreeArcs);       // (output)
  typedef void ExecutionSignature(_1, InputIndex, _2, _3, _4, _5, _6);
  using InputDomain = _1;
 
  vtkm::Id NumArcs; // contourTree.Arcs.GetNumberOfValues()
 
  // Default Constructor
  VTKM_EXEC_CONT
  ComputeRegularStructure_SetAugmentArcs(vtkm::Id numArcs)
    : NumArcs(numArcs)
  {
  }
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const InFieldPortalType& arcSorterPortal,
                            const vtkm::Id sortedNode,
                            const InFieldPortalType& contourTreeSuperparentsPortal,
                            const InFieldPortalType& contourTreeSuperarcsPortal,
                            const InFieldPortalType& contourTreeSupernodesPortal,
                            const InFieldPortalType& toCompressedPortal,
                            const OutFieldPortalType& contourTreeArcsPortal) const
  {
    // per node
    // convert arcSorter to node ID
    vtkm::Id nodeID = arcSorterPortal.Get(sortedNode);
    vtkm::Id superparent = contourTreeSuperparentsPortal.Get(nodeID);
 
    // the end element is always the last
    bool isLastOnSuperarc = false;
    if (sortedNode == NumArcs - 1)
    {
      isLastOnSuperarc = true;
    }
    // otherwise look for a change in the superparent
    else
    {
      isLastOnSuperarc =
        (superparent != contourTreeSuperparentsPortal.Get(arcSorterPortal.Get(sortedNode + 1)));
    }
 
    // if it's the last on the superarc
    if (isLastOnSuperarc)
    { // last on superarc
      // retrieve the superarc's far end
      vtkm::Id superarcEnd = contourTreeSuperarcsPortal.Get(superparent);
      // this only happens for the root of the tree, but is still needed
      if (NoSuchElement(superarcEnd))
      {
        contourTreeArcsPortal.Set(nodeID, (vtkm::Id)NO_SUCH_ELEMENT);
      }
      else
      {
        contourTreeArcsPortal.Set(
          nodeID,
          toCompressedPortal.Get(contourTreeSupernodesPortal.Get(MaskedIndex(superarcEnd))) |
            (superarcEnd & IS_ASCENDING));
      }
    } // last on superarc
    else
    { // not last on superarc
      vtkm::Id neighbour = arcSorterPortal.Get(sortedNode + 1);
      contourTreeArcsPortal.Set(nodeID, neighbour | ((neighbour > nodeID) ? IS_ASCENDING : 0));
    } // not last on superarc
  }
 
}; // ComputeRegularStructure_SetAugmentArcs
 
 
 
 
} // namespace contourtree_maker_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif