147 lines
6.4 KiB
C++
147 lines
6.4 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) 2016, Los Alamos National Security, LLC
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// All rights reserved.
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//
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// Copyright 2016. Los Alamos National Security, LLC.
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// This software was produced under U.S. Government contract DE-AC52-06NA25396
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// for Los Alamos National Laboratory (LANL), which is operated by
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// Los Alamos National Security, LLC for the U.S. Department of Energy.
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// The U.S. Government has rights to use, reproduce, and distribute this
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// software. NEITHER THE GOVERNMENT NOR LOS ALAMOS NATIONAL SECURITY, LLC
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// MAKES ANY WARRANTY, EXPRESS OR IMPLIED, OR ASSUMES ANY LIABILITY FOR THE
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// USE OF THIS SOFTWARE. If software is modified to produce derivative works,
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// such modified software should be clearly marked, so as not to confuse it
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// with the version available from LANL.
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//
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// Additionally, redistribution and use in source and binary forms, with or
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// without modification, are permitted provided that the following conditions
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// are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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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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// 3. Neither the name of Los Alamos National Security, LLC, Los Alamos
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// National Laboratory, LANL, the U.S. Government, nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY LOS ALAMOS NATIONAL SECURITY, LLC AND
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// CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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// BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL LOS ALAMOS
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// NATIONAL SECURITY, LLC OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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// USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//============================================================================
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// This code is based on 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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//
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// COMMENTS:
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//
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// This functor replaces a parallel loop examining neighbours - again, for arbitrary
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// meshes, it needs to be a reduction, but for regular meshes, it's faster this way.
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//
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// Any vector needed by the functor for lookup purposes will be passed as a parameter to
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// the constructor and saved, with the actual function call being the operator ()
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//
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// Vectors marked I/O are intrinsically risky unless there is an algorithmic guarantee
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// that the read/writes are completely independent - which for our case actually occurs
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// The I/O vectors should therefore be justified in comments both here & in caller
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//
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//=======================================================================================
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#ifndef vtkm_worklet_contourtree_governing_saddle_finder_h
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#define vtkm_worklet_contourtree_governing_saddle_finder_h
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#include <vtkm/worklet/WorkletMapField.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
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{
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// Worklet for setting initial chain maximum value
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class GoverningSaddleFinder : public vtkm::worklet::WorkletMapField
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{
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public:
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using ControlSignature = void(FieldIn edgeNo, // (input) index into sorted edges
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WholeArrayIn edgeSorter, // (input) sorted edge index
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WholeArrayIn edgeFar, // (input) high ends of edges
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WholeArrayIn edgeNear, // (input) low ends of edges
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WholeArrayOut prunesTo, // (output) where vertex is pruned to
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WholeArrayOut outdegree); // (output) updegree of vertex
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using ExecutionSignature = void(_1, _2, _3, _4, _5, _6);
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using InputDomain = _1;
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// Constructor
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VTKM_EXEC_CONT
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GoverningSaddleFinder() {}
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template <typename InFieldPortalType, typename OutFieldPortalType>
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VTKM_EXEC void operator()(const vtkm::Id& edgeNo,
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const InFieldPortalType& edgeSorter,
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const InFieldPortalType& edgeFar,
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const InFieldPortalType& edgeNear,
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const OutFieldPortalType& prunesTo,
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const OutFieldPortalType& outdegree) const
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{
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// default to true
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bool isBestSaddleEdge = true;
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// retrieve the edge ID
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vtkm::Id edge = edgeSorter.Get(edgeNo);
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// edge no. 0 is always best, so skip it
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if (edgeNo != 0)
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{
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// retrieve the previous edge
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vtkm::Id prevEdge = edgeSorter.Get(edgeNo - 1);
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// if the previous edge has the same far end
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if (edgeFar.Get(prevEdge) == edgeFar.Get(edge))
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isBestSaddleEdge = false;
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}
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if (isBestSaddleEdge)
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{ // found an extremum
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// retrieve the near end as the saddle
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vtkm::Id saddle = edgeNear.Get(edge);
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// and the far end as the extremum
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vtkm::Id extreme = edgeFar.Get(edge);
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// set the extremum to point to the saddle in the chainExtremum array
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prunesTo.Set(extreme, saddle);
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// and set the outdegree to 0
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outdegree.Set(extreme, 0);
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} // found a extremum
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} // operator()
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}; // GoverningSaddleFinder
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}
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}
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}
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#endif
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