mirror of
https://gitlab.kitware.com/vtk/vtk-m
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117 lines
4.1 KiB
C++
117 lines
4.1 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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#ifndef vtkm_exec_celllocatoruniformgrid_h
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#define vtkm_exec_celllocatoruniformgrid_h
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#include <vtkm/Bounds.h>
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#include <vtkm/TopologyElementTag.h>
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#include <vtkm/Types.h>
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#include <vtkm/VecFromPortalPermute.h>
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#include <vtkm/cont/CellSetStructured.h>
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#include <vtkm/exec/CellInside.h>
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#include <vtkm/exec/CellLocator.h>
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#include <vtkm/exec/ParametricCoordinates.h>
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namespace vtkm
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{
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namespace exec
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{
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template <typename DeviceAdapter, vtkm::IdComponent dimensions>
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class VTKM_ALWAYS_EXPORT CellLocatorUniformGrid final : public vtkm::exec::CellLocator
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{
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private:
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using FromType = vtkm::TopologyElementTagPoint;
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using ToType = vtkm::TopologyElementTagCell;
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using CellSetPortal = vtkm::exec::ConnectivityStructured<vtkm::TopologyElementTagPoint,
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vtkm::TopologyElementTagCell,
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dimensions>;
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using CoordsPortal = typename vtkm::cont::ArrayHandleVirtualCoordinates::template ExecutionTypes<
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DeviceAdapter>::PortalConst;
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public:
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VTKM_CONT
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CellLocatorUniformGrid(const vtkm::Bounds& bounds,
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const vtkm::Vec3f rangeTransform,
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const vtkm::Id3 cellDims,
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const vtkm::cont::CellSetStructured<dimensions>& cellSet,
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const vtkm::cont::ArrayHandleVirtualCoordinates& coords,
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DeviceAdapter)
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: Bounds(bounds)
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, RangeTransform(rangeTransform)
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, CellDims(cellDims)
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, PlaneSize(cellDims[0] * cellDims[1])
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, RowSize(cellDims[0])
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, CellSet(cellSet.PrepareForInput(DeviceAdapter(), FromType(), ToType()))
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, Coords(coords.PrepareForInput(DeviceAdapter()))
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{
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}
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VTKM_EXEC_CONT virtual ~CellLocatorUniformGrid() noexcept
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{
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// This must not be defaulted, since defaulted virtual destructors are
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// troublesome with CUDA __host__ __device__ markup.
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}
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VTKM_EXEC
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void FindCell(const vtkm::Vec3f& point,
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vtkm::Id& cellId,
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vtkm::Vec3f& parametric,
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const vtkm::exec::FunctorBase& worklet) const override
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{
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if (!Bounds.Contains(point))
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{
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cellId = -1;
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return;
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}
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// Get the Cell Id from the point.
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vtkm::Id3 logicalCell(0, 0, 0);
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logicalCell[0] = (point[0] == Bounds.X.Max)
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? CellDims[0] - 1
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: static_cast<vtkm::Id>(vtkm::Floor((point[0] - Bounds.X.Min) * RangeTransform[0]));
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logicalCell[1] = (point[1] == Bounds.Y.Max)
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? CellDims[1] - 1
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: static_cast<vtkm::Id>(vtkm::Floor((point[1] - Bounds.Y.Min) * RangeTransform[1]));
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if (dimensions == 3)
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{
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logicalCell[2] = (point[2] == Bounds.Z.Max)
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? CellDims[2] - 1
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: static_cast<vtkm::Id>(vtkm::Floor((point[2] - Bounds.Z.Min) * RangeTransform[2]));
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}
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// Get the actual cellId, from the logical cell index of the cell
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cellId = logicalCell[2] * PlaneSize + logicalCell[1] * RowSize + logicalCell[0];
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bool success = false;
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using IndicesType = typename CellSetPortal::IndicesType;
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IndicesType cellPointIndices = CellSet.GetIndices(cellId);
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vtkm::VecFromPortalPermute<IndicesType, CoordsPortal> cellPoints(&cellPointIndices, Coords);
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auto cellShape = CellSet.GetCellShape(cellId);
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// Get Parametric Coordinates from the cell, for the point.
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parametric = vtkm::exec::WorldCoordinatesToParametricCoordinates(
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cellPoints, point, cellShape, success, worklet);
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}
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private:
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vtkm::Bounds Bounds;
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vtkm::Vec3f RangeTransform;
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vtkm::Id3 CellDims;
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vtkm::Id PlaneSize;
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vtkm::Id RowSize;
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CellSetPortal CellSet;
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CoordsPortal Coords;
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};
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}
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}
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#endif //vtkm_exec_celllocatoruniformgrid_h
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