mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-16 17:22:55 +00:00
130 lines
3.6 KiB
C++
130 lines
3.6 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_VecFromPortal_h
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#define vtk_m_VecFromPortal_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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#include <vtkm/internal/ArrayPortalValueReference.h>
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namespace vtkm
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{
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/// \brief A short variable-length array from a window in an ArrayPortal.
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///
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/// The \c VecFromPortal class is a Vec-like class that holds an array portal
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/// and exposes a small window of that portal as if it were a \c Vec.
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///
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template <typename PortalType>
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class VecFromPortal
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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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VecFromPortal()
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: NumComponents(0)
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, Offset(0)
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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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VecFromPortal(const PortalType& portal, vtkm::IdComponent numComponents = 0, vtkm::Id offset = 0)
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: Portal(portal)
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, NumComponents(numComponents)
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, Offset(offset)
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{
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}
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VTKM_EXEC_CONT
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vtkm::IdComponent GetNumberOfComponents() const { return this->NumComponents; }
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template <typename T, vtkm::IdComponent DestSize>
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VTKM_EXEC_CONT void CopyInto(vtkm::Vec<T, DestSize>& dest) const
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{
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vtkm::IdComponent numComponents = vtkm::Min(DestSize, this->NumComponents);
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for (vtkm::IdComponent index = 0; index < numComponents; index++)
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{
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dest[index] = this->Portal.Get(index + this->Offset);
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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::internal::ArrayPortalValueReference<PortalType> operator[](vtkm::IdComponent index) const
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{
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return vtkm::internal::ArrayPortalValueReference<PortalType>(this->Portal,
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index + this->Offset);
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}
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private:
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PortalType Portal;
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vtkm::IdComponent NumComponents;
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vtkm::Id Offset;
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};
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template <typename PortalType>
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struct TypeTraits<vtkm::VecFromPortal<PortalType>>
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{
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private:
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using ComponentType = typename PortalType::ValueType;
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public:
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using NumericTag = typename vtkm::TypeTraits<ComponentType>::NumericTag;
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using DimensionalityTag = TypeTraitsVectorTag;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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static vtkm::VecFromPortal<PortalType> ZeroInitialization()
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{
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return vtkm::VecFromPortal<PortalType>();
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}
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};
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template <typename PortalType>
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struct VecTraits<vtkm::VecFromPortal<PortalType>>
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{
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using VecType = vtkm::VecFromPortal<PortalType>;
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using ComponentType = typename VecType::ComponentType;
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using HasMultipleComponents = vtkm::VecTraitsTagMultipleComponents;
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using IsSizeStatic = vtkm::VecTraitsTagSizeVariable;
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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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} // namespace vtkm
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#endif //vtk_m_VecFromPortal_h
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