314 lines
8.7 KiB
C++
314 lines
8.7 KiB
C++
//=============================================================================
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//
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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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// Copyright 2017 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
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// Copyright 2017 UT-Battelle, LLC.
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// Copyright 2017 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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// 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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//=============================================================================
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#ifndef vtk_m_cont_ArrayHandleExtractComponent_h
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#define vtk_m_cont_ArrayHandleExtractComponent_h
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#include <vtkm/VecTraits.h>
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#include <vtkm/cont/ArrayHandle.h>
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namespace vtkm
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{
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namespace cont
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{
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namespace internal
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{
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template <typename PortalType>
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class VTKM_ALWAYS_EXPORT ArrayPortalExtractComponent
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{
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public:
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using VectorType = typename PortalType::ValueType;
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using Traits = vtkm::VecTraits<VectorType>;
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using ValueType = typename Traits::ComponentType;
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VTKM_EXEC_CONT
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ArrayPortalExtractComponent()
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: Portal()
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, Component(0)
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{
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}
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VTKM_EXEC_CONT
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ArrayPortalExtractComponent(const PortalType& portal, vtkm::IdComponent component)
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: Portal(portal)
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, Component(component)
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{
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}
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// Copy constructor
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VTKM_EXEC_CONT ArrayPortalExtractComponent(const ArrayPortalExtractComponent<PortalType>& src)
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: Portal(src.Portal)
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, Component(src.Component)
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{
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}
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VTKM_EXEC_CONT
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vtkm::Id GetNumberOfValues() const { return this->Portal.GetNumberOfValues(); }
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VTKM_EXEC_CONT
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ValueType Get(vtkm::Id index) const
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{
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return Traits::GetComponent(this->Portal.Get(index), this->Component);
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}
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VTKM_EXEC_CONT
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void Set(vtkm::Id index, const ValueType& value) const
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{
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VectorType vec = this->Portal.Get(index);
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Traits::SetComponent(vec, this->Component, value);
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this->Portal.Set(index, vec);
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}
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VTKM_EXEC_CONT
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const PortalType& GetPortal() const { return this->Portal; }
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private:
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PortalType Portal;
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vtkm::IdComponent Component;
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}; // class ArrayPortalExtractComponent
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} // namespace internal
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template <typename ArrayHandleType>
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class StorageTagExtractComponent
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{
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};
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namespace internal
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{
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template <typename ArrayHandleType>
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class Storage<typename vtkm::VecTraits<typename ArrayHandleType::ValueType>::ComponentType,
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StorageTagExtractComponent<ArrayHandleType>>
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{
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public:
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using PortalType = ArrayPortalExtractComponent<typename ArrayHandleType::PortalControl>;
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using PortalConstType = ArrayPortalExtractComponent<typename ArrayHandleType::PortalConstControl>;
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using ValueType = typename PortalType::ValueType;
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VTKM_CONT
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Storage()
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: Array()
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, Component(0)
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, Valid(false)
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{
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}
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VTKM_CONT
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Storage(const ArrayHandleType& array, vtkm::IdComponent component)
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: Array(array)
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, Component(component)
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, Valid(true)
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{
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}
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VTKM_CONT
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PortalConstType GetPortalConst() const
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{
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VTKM_ASSERT(this->Valid);
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return PortalConstType(this->Array.GetPortalConstControl(), this->Component);
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}
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VTKM_CONT
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PortalType GetPortal()
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{
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VTKM_ASSERT(this->Valid);
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return PortalType(this->Array.GetPortalControl(), this->Component);
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}
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VTKM_CONT
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vtkm::Id GetNumberOfValues() const
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{
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VTKM_ASSERT(this->Valid);
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return this->Array.GetNumberOfValues();
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}
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VTKM_CONT
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void Allocate(vtkm::Id numberOfValues)
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{
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VTKM_ASSERT(this->Valid);
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this->Array.Allocate(numberOfValues);
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}
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VTKM_CONT
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void Shrink(vtkm::Id numberOfValues)
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{
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VTKM_ASSERT(this->Valid);
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this->Array.Shrink(numberOfValues);
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}
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VTKM_CONT
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void ReleaseResources()
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{
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VTKM_ASSERT(this->Valid);
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this->Array.ReleaseResources();
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}
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VTKM_CONT
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const ArrayHandleType& GetArray() const
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{
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VTKM_ASSERT(this->Valid);
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return this->Array;
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}
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VTKM_CONT
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vtkm::IdComponent GetComponent() const
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{
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VTKM_ASSERT(this->Valid);
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return this->Component;
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}
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private:
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ArrayHandleType Array;
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vtkm::IdComponent Component;
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bool Valid;
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}; // class Storage
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template <typename ArrayHandleType, typename Device>
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class ArrayTransfer<typename vtkm::VecTraits<typename ArrayHandleType::ValueType>::ComponentType,
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StorageTagExtractComponent<ArrayHandleType>,
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Device>
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{
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public:
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using ValueType = typename vtkm::VecTraits<typename ArrayHandleType::ValueType>::ComponentType;
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private:
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using StorageTag = StorageTagExtractComponent<ArrayHandleType>;
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using StorageType = vtkm::cont::internal::Storage<ValueType, StorageTag>;
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using ArrayValueType = typename ArrayHandleType::ValueType;
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using ArrayStorageTag = typename ArrayHandleType::StorageTag;
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using ArrayStorageType =
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vtkm::cont::internal::Storage<typename ArrayHandleType::ValueType, ArrayStorageTag>;
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public:
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using PortalControl = typename StorageType::PortalType;
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using PortalConstControl = typename StorageType::PortalConstType;
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using ExecutionTypes = typename ArrayHandleType::template ExecutionTypes<Device>;
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using PortalExecution = ArrayPortalExtractComponent<typename ExecutionTypes::Portal>;
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using PortalConstExecution = ArrayPortalExtractComponent<typename ExecutionTypes::PortalConst>;
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VTKM_CONT
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ArrayTransfer(StorageType* storage)
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: Array(storage->GetArray())
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, Component(storage->GetComponent())
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{
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}
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VTKM_CONT
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vtkm::Id GetNumberOfValues() const { return this->Array.GetNumberOfValues(); }
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VTKM_CONT
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PortalConstExecution PrepareForInput(bool vtkmNotUsed(updateData))
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{
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return PortalConstExecution(this->Array.PrepareForInput(Device()), this->Component);
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}
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VTKM_CONT
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PortalExecution PrepareForInPlace(bool vtkmNotUsed(updateData))
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{
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return PortalExecution(this->Array.PrepareForInPlace(Device()), this->Component);
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}
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VTKM_CONT
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PortalExecution PrepareForOutput(vtkm::Id numberOfValues)
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{
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return PortalExecution(this->Array.PrepareForOutput(numberOfValues, Device()), this->Component);
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}
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VTKM_CONT
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void RetrieveOutputData(StorageType* vtkmNotUsed(storage)) const
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{
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// Implementation of this method should be unnecessary. The internal
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// array handle should automatically retrieve the output data as
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// necessary.
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}
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VTKM_CONT
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void Shrink(vtkm::Id numberOfValues) { this->Array.Shrink(numberOfValues); }
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VTKM_CONT
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void ReleaseResources() { this->Array.ReleaseResourcesExecution(); }
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private:
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ArrayHandleType Array;
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vtkm::IdComponent Component;
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};
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}
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}
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} // namespace vtkm::cont::internal
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namespace vtkm
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{
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namespace cont
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{
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/// \brief A fancy ArrayHandle that turns a vector array into a scalar array by
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/// slicing out a single component of each vector.
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///
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/// ArrayHandleExtractComponent is a specialization of ArrayHandle. It takes an
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/// input ArrayHandle with a vtkm::Vec ValueType and a component index
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/// and uses this information to expose a scalar array consisting of the
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/// specified component across all vectors in the input ArrayHandle. So for a
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/// given index i, ArrayHandleExtractComponent looks up the i-th vtkm::Vec in
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/// the index array and reads or writes to the specified component, leave all
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/// other components unmodified. This is done on the fly rather than creating a
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/// copy of the array.
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template <typename ArrayHandleType>
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class ArrayHandleExtractComponent
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: public vtkm::cont::ArrayHandle<
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typename vtkm::VecTraits<typename ArrayHandleType::ValueType>::ComponentType,
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StorageTagExtractComponent<ArrayHandleType>>
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{
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public:
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VTKM_ARRAY_HANDLE_SUBCLASS(
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ArrayHandleExtractComponent,
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(ArrayHandleExtractComponent<ArrayHandleType>),
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(vtkm::cont::ArrayHandle<
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typename vtkm::VecTraits<typename ArrayHandleType::ValueType>::ComponentType,
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StorageTagExtractComponent<ArrayHandleType>>));
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protected:
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using StorageType = vtkm::cont::internal::Storage<ValueType, StorageTag>;
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public:
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VTKM_CONT
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ArrayHandleExtractComponent(const ArrayHandleType& array, vtkm::IdComponent component)
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: Superclass(StorageType(array, component))
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{
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}
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};
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/// make_ArrayHandleExtractComponent is convenience function to generate an
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/// ArrayHandleExtractComponent.
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template <typename ArrayHandleType>
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VTKM_CONT ArrayHandleExtractComponent<ArrayHandleType> make_ArrayHandleExtractComponent(
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const ArrayHandleType& array,
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vtkm::IdComponent component)
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{
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return ArrayHandleExtractComponent<ArrayHandleType>(array, component);
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}
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}
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} // namespace vtkm::cont
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#endif // vtk_m_cont_ArrayHandleExtractComponent_h
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