ExtractTopVolumeContoursBlock.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.
//
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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_filter_scalar_topology_internal_ExtractTopVolumeContoursBlock_h
#define vtk_m_filter_scalar_topology_internal_ExtractTopVolumeContoursBlock_h
 
#include <vtkm/cont/DataSet.h>
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
#include <vtkm/filter/scalar_topology/worklet/select_top_volume_branches/TopVolumeBranchData.h>
 
namespace vtkm
{
namespace filter
{
namespace scalar_topology
{
namespace internal
{
 
struct ExtractTopVolumeContoursBlock
{
  ExtractTopVolumeContoursBlock(vtkm::Id localBlockNo, int globalBlockId);
 
  // Block metadata
  vtkm::Id LocalBlockNo;
  int GlobalBlockId;
 
  // The data class for branch arrays (e.g., branch root global regular IDs, branch volume, etc.)
  // we reuse the class TopVolumeBranchData that was used in SelectTopVolumeBranchesFilter,
  // because we need more than half of the arrays in this class for contour extraction
  TopVolumeBranchData TopVolumeData;
 
  // Isosurface output
  vtkm::cont::ArrayHandle<vtkm::Vec3f_64> IsosurfaceEdgesFrom;
  vtkm::cont::ArrayHandle<vtkm::Vec3f_64> IsosurfaceEdgesTo;
  vtkm::worklet::contourtree_augmented::IdArrayType IsosurfaceEdgesOffset;
  vtkm::worklet::contourtree_augmented::IdArrayType IsosurfaceEdgesLabels;
  vtkm::worklet::contourtree_augmented::IdArrayType IsosurfaceEdgesOrders;
  vtkm::cont::UnknownArrayHandle IsosurfaceIsoValue;
  // this is a tricky one - it is a part of the isovalue but solely used for simulation of simplicity
  vtkm::worklet::contourtree_augmented::IdArrayType IsosurfaceGRIds;
 
  // Destroy function allowing DIY to own blocks and clean them up after use
  static void Destroy(void* b) { delete static_cast<ExtractTopVolumeContoursBlock*>(b); }
 
  // extract isosurfaces on top branches by volume
  void ExtractIsosurfaceOnSelectedBranch(const vtkm::cont::DataSet& bdDataSet,
                                         const bool isMarchingCubes,
                                         const bool shiftIsovalueByEpsilon,
                                         const vtkm::cont::LogLevel timingsLogLevel);
};
 
} // namespace internal
} // namespace scalar_topology
} // namespace filter
} // namespace vtkm
#endif