mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 21:33:55 +00:00
230 lines
8.2 KiB
C++
230 lines
8.2 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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//
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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 vtk_m_exec_CellLocatorTwoLevel_h
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#define vtk_m_exec_CellLocatorTwoLevel_h
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#include <vtkm/exec/CellInside.h>
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#include <vtkm/exec/ParametricCoordinates.h>
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#include <vtkm/Math.h>
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#include <vtkm/Types.h>
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#include <vtkm/VecFromPortalPermute.h>
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#include <vtkm/VecTraits.h>
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namespace vtkm
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{
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namespace internal
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{
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namespace cl_uniform_bins
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{
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using DimensionType = vtkm::Int16;
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using DimVec3 = vtkm::Vec<DimensionType, 3>;
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using FloatVec3 = vtkm::Vec3f;
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struct Grid
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{
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DimVec3 Dimensions;
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FloatVec3 Origin;
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FloatVec3 BinSize;
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};
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struct Bounds
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{
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FloatVec3 Min;
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FloatVec3 Max;
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};
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VTKM_EXEC inline vtkm::Id ComputeFlatIndex(const DimVec3& idx, const DimVec3 dim)
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{
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return idx[0] + (dim[0] * (idx[1] + (dim[1] * idx[2])));
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}
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VTKM_EXEC inline Grid ComputeLeafGrid(const DimVec3& idx, const DimVec3& dim, const Grid& l1Grid)
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{
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return { dim,
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l1Grid.Origin + (static_cast<FloatVec3>(idx) * l1Grid.BinSize),
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l1Grid.BinSize / static_cast<FloatVec3>(dim) };
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}
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template <typename PointsVecType>
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VTKM_EXEC inline Bounds ComputeCellBounds(const PointsVecType& points)
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{
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using CoordsType = typename vtkm::VecTraits<PointsVecType>::ComponentType;
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auto numPoints = vtkm::VecTraits<PointsVecType>::GetNumberOfComponents(points);
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CoordsType minp = points[0], maxp = points[0];
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for (vtkm::IdComponent i = 1; i < numPoints; ++i)
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{
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minp = vtkm::Min(minp, points[i]);
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maxp = vtkm::Max(maxp, points[i]);
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}
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return { FloatVec3(minp), FloatVec3(maxp) };
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}
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}
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}
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} // vtkm::internal::cl_uniform_bins
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namespace vtkm
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{
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namespace exec
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{
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//--------------------------------------------------------------------
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template <typename CellSetType, typename DeviceAdapter>
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class VTKM_ALWAYS_EXPORT CellLocatorTwoLevel : public vtkm::exec::CellLocator
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{
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private:
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using DimVec3 = vtkm::internal::cl_uniform_bins::DimVec3;
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using FloatVec3 = vtkm::internal::cl_uniform_bins::FloatVec3;
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template <typename T>
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using ArrayPortalConst =
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typename vtkm::cont::ArrayHandle<T>::template ExecutionTypes<DeviceAdapter>::PortalConst;
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using CoordsPortalType =
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typename vtkm::cont::CoordinateSystem::MultiplexerArrayType::ExecutionTypes<
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DeviceAdapter>::PortalConst;
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using CellSetP2CExecType =
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decltype(std::declval<CellSetType>().PrepareForInput(DeviceAdapter{},
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vtkm::TopologyElementTagCell{},
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vtkm::TopologyElementTagPoint{},
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std::declval<vtkm::cont::Token&>()));
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// TODO: This function may return false positives for non 3D cells as the
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// tests are done on the projection of the point on the cell. Extra checks
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// should be added to test if the point actually falls on the cell.
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template <typename CellShapeTag, typename CoordsType>
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VTKM_EXEC static vtkm::ErrorCode PointInsideCell(FloatVec3 point,
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CellShapeTag cellShape,
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CoordsType cellPoints,
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FloatVec3& parametricCoordinates,
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bool& inside)
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{
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auto bounds = vtkm::internal::cl_uniform_bins::ComputeCellBounds(cellPoints);
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if (point[0] >= bounds.Min[0] && point[0] <= bounds.Max[0] && point[1] >= bounds.Min[1] &&
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point[1] <= bounds.Max[1] && point[2] >= bounds.Min[2] && point[2] <= bounds.Max[2])
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{
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VTKM_RETURN_ON_ERROR(vtkm::exec::WorldCoordinatesToParametricCoordinates(
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cellPoints, point, cellShape, parametricCoordinates));
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inside = vtkm::exec::CellInside(parametricCoordinates, cellShape);
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}
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else
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{
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inside = false;
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}
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// Return success error code even point is not inside this cell
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return vtkm::ErrorCode::Success;
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}
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public:
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VTKM_CONT CellLocatorTwoLevel(const vtkm::internal::cl_uniform_bins::Grid& topLevelGrid,
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const vtkm::cont::ArrayHandle<DimVec3>& leafDimensions,
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const vtkm::cont::ArrayHandle<vtkm::Id>& leafStartIndex,
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const vtkm::cont::ArrayHandle<vtkm::Id>& cellStartIndex,
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const vtkm::cont::ArrayHandle<vtkm::Id>& cellCount,
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const vtkm::cont::ArrayHandle<vtkm::Id>& cellIds,
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const CellSetType& cellSet,
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const vtkm::cont::CoordinateSystem& coords,
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vtkm::cont::Token& token)
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: TopLevel(topLevelGrid)
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, LeafDimensions(leafDimensions.PrepareForInput(DeviceAdapter{}, token))
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, LeafStartIndex(leafStartIndex.PrepareForInput(DeviceAdapter{}, token))
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, CellStartIndex(cellStartIndex.PrepareForInput(DeviceAdapter{}, token))
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, CellCount(cellCount.PrepareForInput(DeviceAdapter{}, token))
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, CellIds(cellIds.PrepareForInput(DeviceAdapter{}, token))
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, CellSet(cellSet.PrepareForInput(DeviceAdapter{},
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vtkm::TopologyElementTagCell{},
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vtkm::TopologyElementTagPoint{},
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token))
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, Coords(coords.GetDataAsMultiplexer().PrepareForInput(DeviceAdapter{}, token))
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{
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}
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VTKM_EXEC_CONT virtual ~CellLocatorTwoLevel() noexcept override
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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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vtkm::ErrorCode FindCell(const FloatVec3& point,
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vtkm::Id& cellId,
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FloatVec3& parametric) const override
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{
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using namespace vtkm::internal::cl_uniform_bins;
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cellId = -1;
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DimVec3 binId3 = static_cast<DimVec3>((point - this->TopLevel.Origin) / this->TopLevel.BinSize);
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if (binId3[0] >= 0 && binId3[0] < this->TopLevel.Dimensions[0] && binId3[1] >= 0 &&
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binId3[1] < this->TopLevel.Dimensions[1] && binId3[2] >= 0 &&
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binId3[2] < this->TopLevel.Dimensions[2])
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{
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vtkm::Id binId = ComputeFlatIndex(binId3, this->TopLevel.Dimensions);
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auto ldim = this->LeafDimensions.Get(binId);
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if (!ldim[0] || !ldim[1] || !ldim[2])
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{
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return vtkm::ErrorCode::CellNotFound;
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}
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auto leafGrid = ComputeLeafGrid(binId3, ldim, this->TopLevel);
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DimVec3 leafId3 = static_cast<DimVec3>((point - leafGrid.Origin) / leafGrid.BinSize);
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// precision issues may cause leafId3 to be out of range so clamp it
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leafId3 = vtkm::Max(DimVec3(0), vtkm::Min(ldim - DimVec3(1), leafId3));
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vtkm::Id leafStart = this->LeafStartIndex.Get(binId);
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vtkm::Id leafId = leafStart + ComputeFlatIndex(leafId3, leafGrid.Dimensions);
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vtkm::Id start = this->CellStartIndex.Get(leafId);
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vtkm::Id end = start + this->CellCount.Get(leafId);
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for (vtkm::Id i = start; i < end; ++i)
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{
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vtkm::Id cid = this->CellIds.Get(i);
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auto indices = this->CellSet.GetIndices(cid);
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auto pts = vtkm::make_VecFromPortalPermute(&indices, this->Coords);
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FloatVec3 pc;
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bool inside;
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VTKM_RETURN_ON_ERROR(
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PointInsideCell(point, this->CellSet.GetCellShape(cid), pts, pc, inside));
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if (inside)
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{
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cellId = cid;
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parametric = pc;
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return vtkm::ErrorCode::Success;
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}
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}
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}
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return vtkm::ErrorCode::CellNotFound;
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}
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private:
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vtkm::internal::cl_uniform_bins::Grid TopLevel;
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ArrayPortalConst<DimVec3> LeafDimensions;
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ArrayPortalConst<vtkm::Id> LeafStartIndex;
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ArrayPortalConst<vtkm::Id> CellStartIndex;
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ArrayPortalConst<vtkm::Id> CellCount;
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ArrayPortalConst<vtkm::Id> CellIds;
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CellSetP2CExecType CellSet;
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CoordsPortalType Coords;
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};
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}
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} // vtkm::exec
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#endif //vtk_m_exec_CellLocatorTwoLevel_h
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