mirror of
https://gitlab.kitware.com/vtk/vtk-m
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140 lines
4.3 KiB
C++
140 lines
4.3 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 2015 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
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// Copyright 2015 UT-Battelle, LLC.
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// Copyright 2015 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_VecFromPortalPermute_h
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#define vtk_m_VecFromPortalPermute_h
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#include <vtkm/Math.h>
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#include <vtkm/TypeTraits.h>
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#include <vtkm/Types.h>
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#include <vtkm/VecTraits.h>
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namespace vtkm
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{
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/// \brief A short vector from an ArrayPortal and a vector of indices.
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///
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/// The \c VecFromPortalPermute class is a Vec-like class that holds an array
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/// portal and a second Vec-like containing indices into the array. Each value
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/// of this vector is the value from the array with the respective index.
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///
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template <typename IndexVecType, typename PortalType>
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class VecFromPortalPermute
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{
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public:
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using ComponentType = typename std::remove_const<typename PortalType::ValueType>::type;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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VecFromPortalPermute() {}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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VecFromPortalPermute(const IndexVecType* indices, const PortalType& portal)
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: Indices(indices)
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, Portal(portal)
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{
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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vtkm::IdComponent GetNumberOfComponents() const { return this->Indices->GetNumberOfComponents(); }
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VTKM_SUPPRESS_EXEC_WARNINGS
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template <vtkm::IdComponent DestSize>
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VTKM_EXEC_CONT void CopyInto(vtkm::Vec<ComponentType, DestSize>& dest) const
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{
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vtkm::IdComponent numComponents = vtkm::Min(DestSize, this->GetNumberOfComponents());
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for (vtkm::IdComponent index = 0; index < numComponents; index++)
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{
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dest[index] = (*this)[index];
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}
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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ComponentType operator[](vtkm::IdComponent index) const
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{
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return this->Portal.Get((*this->Indices)[index]);
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}
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private:
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const IndexVecType* Indices;
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PortalType Portal;
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};
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template <typename IndexVecType, typename PortalType>
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struct TypeTraits<vtkm::VecFromPortalPermute<IndexVecType, PortalType>>
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{
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private:
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typedef vtkm::VecFromPortalPermute<IndexVecType, PortalType> VecType;
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typedef typename PortalType::ValueType ComponentType;
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public:
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typedef typename vtkm::TypeTraits<ComponentType>::NumericTag NumericTag;
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typedef TypeTraitsVectorTag DimensionalityTag;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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static VecType ZeroInitialization() { return VecType(); }
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};
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template <typename IndexVecType, typename PortalType>
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struct VecTraits<vtkm::VecFromPortalPermute<IndexVecType, PortalType>>
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{
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typedef vtkm::VecFromPortalPermute<IndexVecType, PortalType> VecType;
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typedef typename VecType::ComponentType ComponentType;
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typedef vtkm::VecTraitsTagMultipleComponents HasMultipleComponents;
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typedef vtkm::VecTraitsTagSizeVariable IsSizeStatic;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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static vtkm::IdComponent GetNumberOfComponents(const VecType& vector)
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{
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return vector.GetNumberOfComponents();
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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static ComponentType GetComponent(const VecType& vector, vtkm::IdComponent componentIndex)
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{
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return vector[componentIndex];
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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template <vtkm::IdComponent destSize>
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VTKM_EXEC_CONT static void CopyInto(const VecType& src, vtkm::Vec<ComponentType, destSize>& dest)
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{
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src.CopyInto(dest);
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}
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};
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template <typename IndexVecType, typename PortalType>
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inline VTKM_EXEC VecFromPortalPermute<IndexVecType, PortalType> make_VecFromPortalPermute(
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const IndexVecType* index,
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const PortalType& portal)
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{
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return VecFromPortalPermute<IndexVecType, PortalType>(index, portal);
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}
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} // namespace vtkm
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#endif //vtk_m_VecFromPortalPermute_h
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