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236 lines
11 KiB
C++
236 lines
11 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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// 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 2014 Sandia Corporation.
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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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_mesh3d_dem_saddle_starter_h
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#define vtkm_worklet_contourtree_mesh3d_dem_saddle_starter_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/LinkComponentCaseTable3D.h>
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#include <vtkm/worklet/contourtree/Mesh3D_DEM_Triangulation_Macros.h>
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namespace vtkm {
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namespace worklet {
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namespace contourtree {
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// Worklet for setting initial chain maximum value
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template<typename DeviceAdapter>
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class Mesh3D_DEM_SaddleStarter : public vtkm::worklet::WorkletMapField
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{
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public:
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struct PairType : vtkm::ListTagBase<vtkm::Pair<vtkm::Id, vtkm::Id> > {};
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typedef void ControlSignature(FieldIn<IdType> vertex, // (input) index into active vertices
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FieldIn<PairType> outDegFirstEdge, // (input) out degree/first edge of vertex
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FieldIn<IdType> valueIndex, // (input) index into regular graph
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WholeArrayIn<IdType> linkMask, // (input) neighbors of vertex
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WholeArrayIn<IdType> arcArray, // (input) chain extrema per vertex
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WholeArrayIn<IdType> inverseIndex, // (input) permutation of index
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WholeArrayOut<IdType> edgeNear, // (output) low end of edges
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WholeArrayOut<IdType> edgeFar, // (output) high end of edges
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WholeArrayOut<IdType> activeEdges); // (output) active edge list
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typedef void ExecutionSignature(_1, _2, _3, _4, _5, _6, _7, _8, _9);
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typedef _1 InputDomain;
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typedef typename vtkm::cont::ArrayHandle<vtkm::IdComponent>::template
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ExecutionTypes<DeviceAdapter>::PortalConst IdComponentPortalType;
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typedef typename vtkm::cont::ArrayHandle<vtkm::UInt16>::template
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ExecutionTypes<DeviceAdapter>::PortalConst IdPortalType;
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vtkm::Id nRows; // (input) number of rows in 3D
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vtkm::Id nCols; // (input) number of cols in 3D
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vtkm::Id nSlices; // (input) number of cols in 3D
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bool ascending; // (input) ascending or descending (join or split)
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IdComponentPortalType neighbourTable; // (input) table for neighbour offsets
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IdPortalType caseTable; // (input) case table for neighbours
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// Constructor
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VTKM_EXEC_CONT
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Mesh3D_DEM_SaddleStarter(vtkm::Id NRows,
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vtkm::Id NCols,
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vtkm::Id NSlices,
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bool Ascending,
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IdComponentPortalType NeighbourTable,
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IdPortalType CaseTable) :
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nRows(NRows),
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nCols(NCols),
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nSlices(NSlices),
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ascending(Ascending),
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neighbourTable(NeighbourTable),
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caseTable(CaseTable) {}
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// operator() routine that executes the loop
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template<typename InFieldPortalType, typename OutFieldPortalType>
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VTKM_EXEC
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void operator()(const vtkm::Id& vertex,
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const vtkm::Pair<vtkm::Id,vtkm::Id>& outDegFirstEdge,
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const vtkm::Id& valueIndex,
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const InFieldPortalType& linkMask,
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const InFieldPortalType& arcArray,
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const InFieldPortalType& inverseIndex,
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const OutFieldPortalType& edgeNear,
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const OutFieldPortalType& edgeFar,
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const OutFieldPortalType& activeEdges) const
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{
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vtkm::Id outdegree = outDegFirstEdge.first;
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vtkm::Id firstEdge = outDegFirstEdge.second;
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// skip local extrema
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if (outdegree == 0)
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return;
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// get the saddle mask for the vertex
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vtkm::Id nbrMask = linkMask.Get(valueIndex);
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// get the row and column
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vtkm::Id row = VERTEX_ROW_3D(valueIndex, nRows, nCols);
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vtkm::Id col = VERTEX_COL_3D(valueIndex, nRows, nCols);
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vtkm::Id slice = VERTEX_SLICE_3D(valueIndex, nRows, nCols);
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// we know which edges are outbound, so we count to get the outdegree
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vtkm::Id outDegree = 0;
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vtkm::Id farEnds[MAX_OUTDEGREE_3D];
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for (vtkm::Id edgeNo = 0; edgeNo < N_INCIDENT_EDGES_3D; edgeNo++)
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{
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if (caseTable.Get(nbrMask) & (1 << edgeNo))
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{
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vtkm::Id indx = edgeNo * 3;
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vtkm::Id nbrSlice = slice + neighbourTable.Get(indx);
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vtkm::Id nbrRow = row + neighbourTable.Get(indx + 1);
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vtkm::Id nbrCol = col + neighbourTable.Get(indx + 2);
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vtkm::Id nbr = VERTEX_ID_3D(nbrSlice, nbrRow, nbrCol, nRows, nCols);
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farEnds[outDegree++] = inverseIndex.Get(arcArray.Get(nbr));
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}
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}
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// now we check them against each other
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if ((outDegree == 2) && (farEnds[0] == farEnds[1]))
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{ // outDegree 2 & both match
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// treat as a regular point
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outDegree = 1;
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} // outDegree 2 & both match
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else if (outDegree == 3)
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{ // outDegree 3
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if (farEnds[0] == farEnds[1])
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{ // first two match
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if (farEnds[0] == farEnds[2])
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{ // triple match
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// all match - treat as regular point
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outDegree = 1;
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} // triple match
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else
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{ // first two match, but not third
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// copy third down one place
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farEnds[1] = farEnds[2];
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// and reset the count
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outDegree = 2;
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} //
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} // first two match
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else if ((farEnds[0] == farEnds[2]) || (farEnds[1] == farEnds[2]))
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{ // second one matches either of the first two
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// decrease the count, keeping 0 & 1
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outDegree = 2;
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} // second one matches either of the first two
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} // outDegree 3
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// now the farEnds array holds the far ends we can reach
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for (vtkm::Id edge = 0; edge < outDegree; edge++)
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{
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// compute the edge index in the edge arrays
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vtkm::Id edgeID = firstEdge + edge;
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// now set the near and far ends and save the edge itself
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edgeNear.Set(edgeID, vertex);
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edgeFar.Set(edgeID, farEnds[edge]);
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activeEdges.Set(edgeID, edgeID);
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} // per start
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} // operator()
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}; // Mesh3D_DEM_SaddleStarter
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}
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}
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}
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#endif
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