PointerDoubleUpDownNeighboursWorklet.h

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//============================================================================
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//  See LICENSE.txt for details.
//
//  This software is distributed WITHOUT ANY WARRANTY; without even
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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.
//
// (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 SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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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_pointer_double_up_down_neighbours_worklet_h
#define vtk_m_worklet_contourtree_distributed_bract_maker_pointer_double_up_down_neighbours_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 bract_maker
{
 
class PointerDoubleUpDownNeighboursWorklet : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(WholeArrayInOut upNeighbour,  // input/output
                                WholeArrayInOut downNeighbour // input/output
  );
  using ExecutionSignature = void(InputIndex, _1, _2);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  PointerDoubleUpDownNeighboursWorklet() {}
 
  template <typename InOutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id returnIndex,
                            const InOutFieldPortalType& upNeighbourPortal,
                            const InOutFieldPortalType& downNeighbourPortal) const
  {
    // per vertex
    // retrieve nbr & see if it's terminal
    vtkm::Id upNbr = upNeighbourPortal.Get(returnIndex);
    // otherwise jump
    if (!vtkm::worklet::contourtree_augmented::IsTerminalElement(upNbr))
    {
      upNeighbourPortal.Set(returnIndex, upNeighbourPortal.Get(upNbr));
    }
    // retrieve nbr & see if it's terminal
    vtkm::Id dnNbr = downNeighbourPortal.Get(returnIndex);
    // otherwise jump
    if (!vtkm::worklet::contourtree_augmented::IsTerminalElement(dnNbr))
    {
      downNeighbourPortal.Set(returnIndex, downNeighbourPortal.Get(dnNbr));
    }
 
    // In serial this worklet implements the following operation
    /*
    for (indexType returnIndex = 0; returnIndex < bractVertexSuperset.size(); returnIndex++)
    { // per vertex
        // retrieve nbr & see if it's terminal
        indexType upNbr = upNeighbour[returnIndex];
        // otherwise jump
        if (!isTerminalElement(upNeighbour[returnIndex]))
            upNeighbour[returnIndex] = upNeighbour[upNbr];
 
        // retrieve nbr & see if it's terminal
        indexType dnNbr = downNeighbour[returnIndex];
        // otherwise jump
        if (!isTerminalElement(downNeighbour[returnIndex]))
            downNeighbour[returnIndex] = downNeighbour[dnNbr];
    } // per vertex
    */
  }
}; // PointerDoubleUpDownNeighboursWorklet
 
 
} // namespace bract_maker
} // namespace contourtree_distributed
} // namespace worklet
} // namespace vtkm
 
#endif