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https://gitlab.kitware.com/vtk/vtk-m
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102 lines
4.4 KiB
C++
102 lines
4.4 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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// Copyright (c) 2018, The Regents of the University of California, through
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// Lawrence Berkeley National Laboratory (subject to receipt of any required approvals
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// from the U.S. Dept. of Energy). All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// (1) Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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//
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// (2) Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// (3) Neither the name of the University of California, Lawrence Berkeley National
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// Laboratory, U.S. Dept. of Energy nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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// IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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// OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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// OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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//=============================================================================
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//
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// This code is an extension of the algorithm presented in the paper:
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// Parallel Peak Pruning for Scalable SMP Contour Tree Computation.
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// Hamish Carr, Gunther Weber, Christopher Sewell, and James Ahrens.
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// Proceedings of the IEEE Symposium on Large Data Analysis and Visualization
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// (LDAV), October 2016, Baltimore, Maryland.
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//
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// The PPP2 algorithm and software were jointly developed by
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// Hamish Carr (University of Leeds), Gunther H. Weber (LBNL), and
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// Oliver Ruebel (LBNL)
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//==============================================================================
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#ifndef vtk_m_worklet_contourtree_augmented_pointer_doubling_h
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#define vtk_m_worklet_contourtree_augmented_pointer_doubling_h
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#include <vtkm/exec/ExecutionWholeArray.h>
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#include <vtkm/worklet/WorkletMapField.h>
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#include <vtkm/worklet/contourtree_augmented/Types.h>
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namespace vtkm
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{
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namespace worklet
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{
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namespace contourtree_augmented
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{
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// Functor for doing chain doubling
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// Unary because it takes the index of the element to process, and is not guaranteed to
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// write back moreover, we aren't worried about out-of-sequence writes, since the
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// worst that happens is that an element gets pointer-tripled in the iteration.
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// It will still converge to the same destination.
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class PointerDoubling : public vtkm::worklet::WorkletMapField
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{
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public:
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typedef void ControlSignature(FieldIn vertexID, WholeArrayInOut chains);
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typedef void ExecutionSignature(_1, _2);
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using InputDomain = _1;
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// Constructor
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VTKM_EXEC_CONT
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PointerDoubling() {}
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template <typename InOutFieldPortalType>
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VTKM_EXEC void operator()(const vtkm::Id& vertexID, const InOutFieldPortalType& chains) const
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{
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// get the neighbour's ID
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vtkm::Id neighbour = chains.Get(vertexID);
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// if this is not a terminal vertex
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if (!IsTerminalElement(neighbour))
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{
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// then double-step
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chains.Set(vertexID, chains.Get(neighbour));
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} // else, if the vertex is terminal then do nothing
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}
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}; // PointerDoubling
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} // namespace contourtree_augmented
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} // namespace worklet
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} // namespace vtkm
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#endif // vtkm_worklet_contourtree_augmented_pointer_doubling_h
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