MeshBoundaryContourTreeMesh.h

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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.
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//     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)
//==============================================================================
 
// This header contains a collection of classes used to describe the boundary
// of a mesh, for each main mesh type (i.e., 2D, 3D, and ContourTreeMesh).
// For each mesh type, there are two classes, the actual boundary desriptor
// class and an ExectionObject class with the PrepareForInput function that
// VTKm expects to generate the object for the execution environment.
 
#ifndef vtk_m_worklet_contourtree_augmented_mesh_boundary_mesh_boundary_contour_tree_mesh_h
#define vtk_m_worklet_contourtree_augmented_mesh_boundary_mesh_boundary_contour_tree_mesh_h
 
#include <cstdlib>
 
#include <vtkm/cont/ExecutionObjectBase.h>
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_augmented
{
 
class MeshBoundaryContourTreeMesh
{
public:
  using IndicesPortalType = IdArrayType::ReadPortalType;
 
  VTKM_EXEC_CONT
  MeshBoundaryContourTreeMesh() {}
 
  VTKM_CONT
  MeshBoundaryContourTreeMesh(const IdArrayType& globalMeshIndex,
                              vtkm::Id3 globalSize,
                              vtkm::Id3 minIdx,
                              vtkm::Id3 maxIdx,
                              vtkm::cont::DeviceAdapterId device,
                              vtkm::cont::Token& token)
    : GlobalSize(globalSize)
    , MinIdx(minIdx)
    , MaxIdx(maxIdx)
  {
    assert(this->GlobalSize[0] > 0 && this->GlobalSize[1] > 0);
    this->GlobalMeshIndexPortal = globalMeshIndex.PrepareForInput(device, token);
  }
 
  VTKM_EXEC_CONT
  bool LiesOnBoundary(const vtkm::Id index) const
  {
    vtkm::Id global_idx = this->GlobalMeshIndexPortal.Get(index);
    vtkm::Id3 mesh_idx{ vtkm::Id(global_idx % this->GlobalSize[0]),
                        vtkm::Id((global_idx % (this->GlobalSize[0] * this->GlobalSize[1])) /
                                 this->GlobalSize[0]),
                        vtkm::Id(global_idx / (this->GlobalSize[0] * this->GlobalSize[1])) };
 
    // FIXME: Probably better communicate n_dims in constructor or make it a template parameter
    // Or at least be more consistent in setting this in MinIdx/MaxIdx. Currently MinIdx[2] is 0
    // and MaxIdx[2] is -1 for a 2D data set.
    const auto n_dims = (MaxIdx[2] == -1) ? 2 : 3;
    for (int d = 0; d < n_dims; ++d)
    {
      if (this->MinIdx[d] != this->MaxIdx[d] &&
          (mesh_idx[d] == this->MinIdx[d] || mesh_idx[d] == this->MaxIdx[d]))
      {
        return true;
      }
    }
    return false;
  }
 
  VTKM_EXEC_CONT
  bool IsNecessary(const vtkm::Id idx) const { return this->LiesOnBoundary(idx); }
 
private:
  // mesh block parameters
  vtkm::Id3 GlobalSize;
  vtkm::Id3 MinIdx;
  vtkm::Id3 MaxIdx;
  IndicesPortalType GlobalMeshIndexPortal;
};
 
 
class MeshBoundaryContourTreeMeshExec : public vtkm::cont::ExecutionObjectBase
{
public:
  VTKM_EXEC_CONT
  MeshBoundaryContourTreeMeshExec(const IdArrayType& globalMeshIndex,
                                  vtkm::Id3 globalSize,
                                  vtkm::Id3 minIdx,
                                  vtkm::Id3 maxIdx)
    : GlobalMeshIndex(globalMeshIndex)
    , GlobalSize(globalSize)
    , MinIdx(minIdx)
    , MaxIdx(maxIdx)
  {
  }
 
  VTKM_CONT MeshBoundaryContourTreeMesh PrepareForExecution(vtkm::cont::DeviceAdapterId device,
                                                            vtkm::cont::Token& token) const
  {
    return MeshBoundaryContourTreeMesh(
      this->GlobalMeshIndex, this->GlobalSize, this->MinIdx, this->MaxIdx, device, token);
  }
 
private:
  const IdArrayType& GlobalMeshIndex;
  vtkm::Id3 GlobalSize;
  vtkm::Id3 MinIdx;
  vtkm::Id3 MaxIdx;
};
 
 
} // namespace contourtree_augmented
} // worklet
} // vtkm
 
#endif