FindSuperArcBetweenNodes.h

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//============================================================================
//  Copyright (c) Kitware, Inc.
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//  See LICENSE.txt for details.
//
//  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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// (2) Redistributions in binary form must reproduce the above copyright notice,
//     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_distributed_find_superarc_between_nodes_h
#define vtk_m_worklet_contourtree_distributed_find_superarc_between_nodes_h
 
#include <vtkm/Types.h>
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
 
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_distributed
{
 
 
class FindSuperArcBetweenNodesDeviceData
{
public:
  using IndicesPortalType =
    typename vtkm::worklet::contourtree_augmented::IdArrayType::ReadPortalType;
 
  VTKM_CONT
  FindSuperArcBetweenNodesDeviceData(
    vtkm::cont::DeviceAdapterId device,
    vtkm::cont::Token& token,
    const vtkm::worklet::contourtree_augmented::IdArrayType& superarcs)
  {
    // Prepare the arrays for input and store the array portals
    // so that they can be used inside a workelt
    this->SuperarcsPortal = superarcs.PrepareForInput(device, token);
  }
 
  // routine to find the superarc from one node to another
  // it will always be the same ID as one of them if it exists
  // if not, it will be NO_SUCH_ELEMENT
  VTKM_EXEC
  vtkm::Id FindSuperArcBetweenNodes(vtkm::Id firstSupernode, vtkm::Id secondSupernode) const
  { // FindSuperArcBetweenNodes()
    // if the second is the target of the first's superarc
    if (vtkm::worklet::contourtree_augmented::MaskedIndex(
          this->SuperarcsPortal.Get(firstSupernode)) == secondSupernode)
    {
      return firstSupernode;
    }
    // flip and test the other way
    if (vtkm::worklet::contourtree_augmented::MaskedIndex(
          this->SuperarcsPortal.Get(secondSupernode)) == firstSupernode)
    {
      return secondSupernode;
    }
    // otherwise it fails
    return vtkm::worklet::contourtree_augmented::NO_SUCH_ELEMENT;
  } // FindSuperArcBetweenNodes()
 
private:
  // Array portals needed by FindSuperArcBetweenNodes
  IndicesPortalType SuperarcsPortal;
};
 
 
class FindSuperArcBetweenNodes : public vtkm::cont::ExecutionObjectBase
{
public:
  VTKM_CONT
  FindSuperArcBetweenNodes(const vtkm::worklet::contourtree_augmented::IdArrayType& superarcs)
    : Superarcs(superarcs)
  {
  }
 
  VTKM_CONT FindSuperArcBetweenNodesDeviceData
  PrepareForExecution(vtkm::cont::DeviceAdapterId device, vtkm::cont::Token& token) const
  {
    return FindSuperArcBetweenNodesDeviceData(device, token, this->Superarcs);
  }
 
private:
  // Array portals needed by FindSuperArcBetweenNodes
  vtkm::worklet::contourtree_augmented::IdArrayType Superarcs;
};
 
 
} // namespace contourtree_distributed
} // namespace worklet
} // namespace vtkm
 
#endif