BoundaryVerticesPerSuperArcWorklets.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_worklet_contourtree_distributed_bract_maker_boundary_vertices_per_superarc_worklets_h
#define vtk_m_worklet_contourtree_distributed_bract_maker_boundary_vertices_per_superarc_worklets_h
 
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_distributed
{
namespace bract_maker
{
 
// Step 1of2 for BoundaryRestrictedAugmentedContourTreeMaker<MeshType>::ComputeDependentBoundaryCounts
class BoundaryVerticiesPerSuperArcStepOneWorklet : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(WholeArrayIn boundarySuperparents,             // (input)
                                WholeArrayOut superarcIntrinsicBoundaryCount); // (output) hyperarcs
  using ExecutionSignature = void(_1, InputIndex, _2);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  BoundaryVerticiesPerSuperArcStepOneWorklet(vtkm::Id numBoundary)
    : NumBoundary(numBoundary)
  {
  }
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const InFieldPortalType& boundarySuperparentsPortal,
                            const vtkm::Id& boundaryVertex,
                            const OutFieldPortalType& superarcIntrinsicBoundaryCountPortal) const
  {
    if (boundaryVertex == 0)
    {
      return;
    }
 
    vtkm::Id superarcId = boundarySuperparentsPortal.Get(boundaryVertex);
    vtkm::Id prevSuperarcId = boundarySuperparentsPortal.Get(boundaryVertex - 1);
 
    // i. Start by detecting the high end of the range
    // if they don't match, we're at the beginning of a segment - set the *LOWER* segment's value
    if (superarcId != prevSuperarcId)
    {
      superarcIntrinsicBoundaryCountPortal.Set(prevSuperarcId, boundaryVertex);
    }
    // ii. Now set the last one explicitly
    if (boundaryVertex == (this->NumBoundary - 1))
    {
      superarcIntrinsicBoundaryCountPortal.Set(superarcId, this->NumBoundary);
    }
    // In serial this worklet implements the following operation
    /*
    for (indexType boundaryVertex = 1; boundaryVertex < nBoundary; boundaryVertex++)
    { // per boundary vertex
        indexType superarcID = boundarySuperparents[boundaryVertex];
        indexType prevSuperarcID = boundarySuperparents[boundaryVertex-1];
        // if they don't match, we're at the beginning of a segment - set the *LOWER* segment's value
        if (superarcID != prevSuperarcID)
            superarcIntrinsicBoundaryCount[prevSuperarcID] = boundaryVertex;
     } // per boundary vertex
     superarcIntrinsicBoundaryCount[boundarySuperparents[nBoundary-1]] = nBoundary;
 
    */
  }
 
private:
  vtkm::Id NumBoundary;
 
}; // BoundaryVerticiesPerSuperArcStepOneWorklet
 
 
 
// Step 1of2 for BoundaryRestrictedAugmentedContourTreeMaker<MeshType>::ComputeDependentBoundaryCounts
class BoundaryVerticiesPerSuperArcStepTwoWorklet : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(WholeArrayIn boundarySuperparents,             // (input)
                                WholeArrayOut superarcIntrinsicBoundaryCount); // (output) hyperarcs
  using ExecutionSignature = void(_1, InputIndex, _2);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  BoundaryVerticiesPerSuperArcStepTwoWorklet() {}
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const InFieldPortalType& boundarySuperparentsPortal,
                            const vtkm::Id& boundaryVertex,
                            const OutFieldPortalType& superarcIntrinsicBoundaryCountPortal) const
  {
    if (boundaryVertex == 0)
    {
      return;
    }
 
    vtkm::Id superarcId = boundarySuperparentsPortal.Get(boundaryVertex);
    vtkm::Id prevSuperarcId = boundarySuperparentsPortal.Get(boundaryVertex - 1);
 
    // i. Start by detecting the high end of the range
    // if they don't match, we're at the beginning of a segment - set the *LOWER* segment's value
    if (superarcId != prevSuperarcId)
    {
      superarcIntrinsicBoundaryCountPortal.Set(
        superarcId, superarcIntrinsicBoundaryCountPortal.Get(superarcId) - boundaryVertex);
    }
 
    // In serial this worklet implements the following operation
    /*
    for (indexType boundaryVertex = 1; boundaryVertex < nBoundary; boundaryVertex++)
      { // per boundary vertex
      indexType superarcID = boundarySuperparents[boundaryVertex];
      indexType prevSuperarcID = boundarySuperparents[boundaryVertex-1];
      // if they don't match, we're at the beginning of a segment - set the *LOWER* segment's value
      if (superarcID != prevSuperarcID)
        superarcIntrinsicBoundaryCount[superarcID] -= boundaryVertex;
      } // per boundary vertex
 
    */
  }
}; // BoundaryVerticiesPerSuperArcStepTwoWorklet
 
} // namespace bract_maker
} // namespace contourtree_distributed
} // namespace worklet
} // namespace vtkm
 
#endif