mirror of
https://gitlab.kitware.com/vtk/vtk-m
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128 lines
3.7 KiB
C++
128 lines
3.7 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 VisitType = vtkm::TopologyElementTagCell;
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using IncidentType = vtkm::TopologyElementTagPoint;
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using CellSetPortal = vtkm::exec::ConnectivityStructured<VisitType, IncidentType, 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::Id3 cellDims,
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const vtkm::Id3 pointDims,
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const vtkm::Vec3f origin,
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const vtkm::Vec3f invSpacing,
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const vtkm::Vec3f maxPoint,
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const vtkm::cont::ArrayHandleVirtualCoordinates& coords,
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DeviceAdapter)
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: CellDims(cellDims)
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, PointDims(pointDims)
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, Origin(origin)
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, InvSpacing(invSpacing)
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, MaxPoint(maxPoint)
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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 inline bool IsInside(const vtkm::Vec3f& point) const
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{
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bool inside = true;
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if (point[0] < this->Origin[0] || point[0] > this->MaxPoint[0])
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inside = false;
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if (point[1] < this->Origin[1] || point[1] > this->MaxPoint[1])
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inside = false;
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if (point[2] < this->Origin[2] || point[2] > this->MaxPoint[2])
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inside = false;
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return inside;
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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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(void)worklet; //suppress unused warning
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if (!this->IsInside(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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vtkm::Vec3f temp;
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temp = point - this->Origin;
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temp = temp * this->InvSpacing;
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//make sure that if we border the upper edge, we sample the correct cell
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logicalCell = temp;
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if (logicalCell[0] == this->CellDims[0])
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{
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logicalCell[0]--;
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}
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if (logicalCell[1] == this->CellDims[1])
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{
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logicalCell[1]--;
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}
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if (logicalCell[2] == this->CellDims[2])
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{
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logicalCell[2]--;
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}
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if (dimensions == 2)
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logicalCell[2] = 0;
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cellId =
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(logicalCell[2] * this->CellDims[1] + logicalCell[1]) * this->CellDims[0] + logicalCell[0];
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parametric = temp - logicalCell;
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}
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private:
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vtkm::Id3 CellDims;
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vtkm::Id3 PointDims;
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vtkm::Vec3f Origin;
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vtkm::Vec3f InvSpacing;
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vtkm::Vec3f MaxPoint;
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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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