170 lines
5.7 KiB
C++
170 lines
5.7 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_celllocatorrectilineargrid_h
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#define vtkm_exec_celllocatorrectilineargrid_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/ConnectivityStructured.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 CellLocatorRectilinearGrid 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 AxisHandle = vtkm::cont::ArrayHandle<vtkm::FloatDefault>;
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using RectilinearType =
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vtkm::cont::ArrayHandleCartesianProduct<AxisHandle, AxisHandle, AxisHandle>;
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using AxisPortalType = typename AxisHandle::template ExecutionTypes<DeviceAdapter>::PortalConst;
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using RectilinearPortalType =
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typename RectilinearType::template ExecutionTypes<DeviceAdapter>::PortalConst;
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public:
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VTKM_CONT
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CellLocatorRectilinearGrid(const vtkm::Id planeSize,
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const vtkm::Id rowSize,
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const vtkm::cont::CellSetStructured<dimensions>& cellSet,
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const RectilinearType& coords,
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DeviceAdapter)
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: PlaneSize(planeSize)
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, RowSize(rowSize)
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, CellSet(cellSet.PrepareForInput(DeviceAdapter(), VisitType(), IncidentType()))
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, Coords(coords.PrepareForInput(DeviceAdapter()))
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, PointDimensions(cellSet.GetPointDimensions())
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{
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this->AxisPortals[0] = this->Coords.GetFirstPortal();
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this->MinPoint[0] = coords.GetPortalConstControl().GetFirstPortal().Get(0);
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this->MaxPoint[0] =
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coords.GetPortalConstControl().GetFirstPortal().Get(this->PointDimensions[0] - 1);
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this->AxisPortals[1] = this->Coords.GetSecondPortal();
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this->MinPoint[1] = coords.GetPortalConstControl().GetSecondPortal().Get(0);
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this->MaxPoint[1] =
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coords.GetPortalConstControl().GetSecondPortal().Get(this->PointDimensions[1] - 1);
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if (dimensions == 3)
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{
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this->AxisPortals[2] = this->Coords.GetThirdPortal();
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this->MinPoint[2] = coords.GetPortalConstControl().GetThirdPortal().Get(0);
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this->MaxPoint[2] =
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coords.GetPortalConstControl().GetThirdPortal().Get(this->PointDimensions[2] - 1);
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}
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}
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VTKM_EXEC_CONT virtual ~CellLocatorRectilinearGrid() 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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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->MinPoint[0] || point[0] > this->MaxPoint[0])
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inside = false;
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if (point[1] < this->MinPoint[1] || point[1] > this->MaxPoint[1])
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inside = false;
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if (dimensions == 3)
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{
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if (point[2] < this->MinPoint[2] || point[2] > this->MaxPoint[2])
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inside = false;
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}
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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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for (vtkm::Int32 dim = 0; dim < dimensions; ++dim)
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{
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//
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// When searching for points, we consider the max value of the cell
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// to be apart of the next cell. If the point falls on the boundary of the
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// data set, then it is technically inside a cell. This checks for that case
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//
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if (point[dim] == MaxPoint[dim])
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{
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logicalCell[dim] = this->PointDimensions[dim] - 2;
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continue;
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}
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vtkm::Id minIndex = 0;
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vtkm::Id maxIndex = this->PointDimensions[dim] - 1;
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vtkm::FloatDefault minVal;
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vtkm::FloatDefault maxVal;
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minVal = this->AxisPortals[dim].Get(minIndex);
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maxVal = this->AxisPortals[dim].Get(maxIndex);
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while (maxIndex > minIndex + 1)
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{
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vtkm::Id midIndex = (minIndex + maxIndex) / 2;
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vtkm::FloatDefault midVal = this->AxisPortals[dim].Get(midIndex);
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if (point[dim] <= midVal)
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{
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maxIndex = midIndex;
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maxVal = midVal;
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}
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else
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{
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minIndex = midIndex;
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minVal = midVal;
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}
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}
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logicalCell[dim] = minIndex;
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parametric[dim] = (point[dim] - minVal) / (maxVal - minVal);
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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] * this->PlaneSize + logicalCell[1] * this->RowSize + logicalCell[0];
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}
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private:
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vtkm::Id PlaneSize;
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vtkm::Id RowSize;
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CellSetPortal CellSet;
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RectilinearPortalType Coords;
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AxisPortalType AxisPortals[3];
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vtkm::Vec<vtkm::Id, dimensions> PointDimensions;
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vtkm::Vec3f MinPoint;
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vtkm::Vec3f MaxPoint;
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};
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} //namespace exec
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} //namespace vtkm
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#endif //vtkm_exec_celllocatorrectilineargrid_h
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