mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-20 02:55:47 +00:00
178 lines
6.2 KiB
C++
178 lines
6.2 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 2017 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2017 Los Alamos National Security.
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//
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// Under the terms of Contract DE-NA0003525 with NTESS,
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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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#ifndef vtk_m_cont_PointLocatorUniformGrid_h
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#define vtk_m_cont_PointLocatorUniformGrid_h
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#include <vtkm/cont/ArrayHandleCounting.h>
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#include <vtkm/cont/DeviceAdapter.h>
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#include <vtkm/cont/DeviceAdapterAlgorithm.h>
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#include <vtkm/cont/TryExecute.h>
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#include <vtkm/worklet/DispatcherMapField.h>
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#include <vtkm/worklet/WorkletMapField.h>
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#include <vtkm/cont/PointLocator.h>
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#include <vtkm/exec/PointLocatorUniformGrid.h>
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namespace vtkm
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{
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namespace cont
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{
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class PointLocatorUniformGrid : public vtkm::cont::PointLocator
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{
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public:
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PointLocatorUniformGrid(const vtkm::Vec<vtkm::FloatDefault, 3>& _min,
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const vtkm::Vec<vtkm::FloatDefault, 3>& _max,
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const vtkm::Vec<vtkm::Id, 3>& _dims)
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: PointLocator()
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, Min(_min)
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, Max(_max)
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, Dims(_dims)
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{
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}
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class BinPointsWorklet : public vtkm::worklet::WorkletMapField
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{
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public:
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using ControlSignature = void(FieldIn<> coord, FieldOut<> label);
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using ExecutionSignature = void(_1, _2);
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VTKM_CONT
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BinPointsWorklet(vtkm::Vec<vtkm::FloatDefault, 3> _min,
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vtkm::Vec<vtkm::FloatDefault, 3> _max,
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vtkm::Vec<vtkm::Id, 3> _dims)
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: Min(_min)
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, Dims(_dims)
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, Dxdydz((_max - Min) / Dims)
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{
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}
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template <typename CoordVecType, typename IdType>
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VTKM_EXEC void operator()(const CoordVecType& coord, IdType& label) const
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{
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vtkm::Vec<vtkm::Id, 3> ijk = (coord - Min) / Dxdydz;
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label = ijk[0] + ijk[1] * Dims[0] + ijk[2] * Dims[0] * Dims[1];
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}
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private:
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vtkm::Vec<vtkm::FloatDefault, 3> Min;
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vtkm::Vec<vtkm::Id, 3> Dims;
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vtkm::Vec<vtkm::FloatDefault, 3> Dxdydz;
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};
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/// \brief Construct a 3D uniform grid for nearest neighbor search.
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///
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/// \param coords An ArrayHandle of x, y, z coordinates of input points.
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/// \param device Tag for selecting device adapter
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//template <typename DeviceAdapter>
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//void Build(const vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::FloatDefault, 3>>& coords, DeviceAdapter)
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struct BuildFunctor
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{
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BuildFunctor(vtkm::cont::PointLocatorUniformGrid _self)
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: self(_self)
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{
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}
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template <typename Device>
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bool operator()(Device)
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{
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using Algorithm = vtkm::cont::DeviceAdapterAlgorithm<Device>;
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// Save training data points.
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//Algorithm::Copy(coords, _Coords);
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// generate unique id for each input point
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vtkm::cont::ArrayHandleCounting<vtkm::Id> pointCounting(
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0, 1, self.coords.GetNumberOfValues());
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Algorithm::Copy(pointCounting, self.pointIds);
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// bin points into cells and give each of them the cell id.
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BinPointsWorklet cellIdWorklet(self.Min, self.Max, self.Dims);
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vtkm::worklet::DispatcherMapField<BinPointsWorklet> dispatchCellId(cellIdWorklet);
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dispatchCellId.Invoke(self.coords, self._CellIds);
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// Group points of the same cell together by sorting them according to the cell ids
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Algorithm::SortByKey(self._CellIds, self.pointIds);
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// for each cell, find the lower and upper bound of indices to the sorted point ids.
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vtkm::cont::ArrayHandleCounting<vtkm::Id> cell_ids_counting(
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0, 1, self.Dims[0] * self.Dims[1] * self.Dims[2]);
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Algorithm::UpperBounds(self._CellIds, cell_ids_counting, self._CellUpper);
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Algorithm::LowerBounds(self._CellIds, cell_ids_counting, self._CellLower);
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return true;
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}
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private:
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vtkm::cont::PointLocatorUniformGrid& self;
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};
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void Build() override
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{
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BuildFunctor functor(*this);
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bool success = vtkm::cont::TryExecute(functor);
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if (!success)
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{
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throw vtkm::cont::ErrorExecution("Could not build point locator structure");
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}
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};
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using HandleType = vtkm::cont::VirtualObjectHandle<vtkm::exec::PointLocator>;
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VTKM_CONT
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const vtkm::exec::PointLocator* PrepareForExecution(vtkm::cont::DeviceAdapterId deviceId) override
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{
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// TODO: call VirtualObjectHandle::PrepareForExecution() and return vtkm::exec::PointLocator
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// TODO: how to convert deviceId back to DeviceAdapter tag?
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using DeviceAdapter = vtkm::cont::DeviceAdapterTagSerial;
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vtkm::exec::PointLocatorUniformGrid* locator =
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new vtkm::exec::PointLocatorUniformGrid(Min,
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Max,
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Dims,
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coords.PrepareForInput(DeviceAdapter()),
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pointIds.PrepareForInput(DeviceAdapter()),
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_CellLower.PrepareForInput(DeviceAdapter()),
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_CellUpper.PrepareForInput(DeviceAdapter()));
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ExecHandle = new HandleType(locator, false);
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return ExecHandle->PrepareForExecution(DeviceAdapter());
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}
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private:
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vtkm::Vec<vtkm::FloatDefault, 3> Min;
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vtkm::Vec<vtkm::FloatDefault, 3> Max;
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vtkm::Vec<vtkm::Id, 3> Dims;
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// TODO: how to convert CoordinateSystem to ArrayHandle<Vec<Float, 3>>?
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vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::FloatDefault, 3>> coords;
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vtkm::cont::ArrayHandle<vtkm::Id> pointIds;
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vtkm::cont::ArrayHandle<vtkm::Id> _CellIds;
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vtkm::cont::ArrayHandle<vtkm::Id> _CellLower;
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vtkm::cont::ArrayHandle<vtkm::Id> _CellUpper;
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// TODO: std::unique_ptr/std::shared_ptr?
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HandleType* ExecHandle;
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};
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}
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}
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#endif //vtk_m_cont_PointLocatorUniformGrid_h
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