158 lines
4.5 KiB
C++
158 lines
4.5 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_VecVariable_h
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#define vtk_m_VecVariable_h
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#include <vtkm/Assert.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 variable-length array with maximum length.
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///
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/// The \c VecVariable class is a Vec-like class that holds a short array of
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/// some maximum length. To avoid dynamic allocations, the maximum length is
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/// specified at compile time. Internally, \c VecVariable holds a \c Vec of
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/// the maximum length and exposes a subsection of it.
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///
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template <typename T, vtkm::IdComponent MaxSize>
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class VecVariable
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{
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public:
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using ComponentType = T;
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VTKM_EXEC_CONT
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VecVariable()
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: NumComponents(0)
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{
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}
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template <typename SrcVecType>
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VTKM_EXEC_CONT VecVariable(const SrcVecType& src)
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: NumComponents(src.GetNumberOfComponents())
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{
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VTKM_ASSERT(this->NumComponents <= MaxSize);
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for (vtkm::IdComponent index = 0; index < this->NumComponents; index++)
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{
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this->Data[index] = src[index];
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}
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}
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VTKM_EXEC_CONT
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inline vtkm::IdComponent GetNumberOfComponents() const { return this->NumComponents; }
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template <vtkm::IdComponent DestSize>
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VTKM_EXEC_CONT inline void CopyInto(vtkm::Vec<ComponentType, 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->Data[index];
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}
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}
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VTKM_EXEC_CONT
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inline const ComponentType& operator[](vtkm::IdComponent index) const
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{
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VTKM_ASSERT(index >= 0 && index < this->NumComponents);
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return this->Data[index];
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}
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VTKM_EXEC_CONT
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inline ComponentType& operator[](vtkm::IdComponent index)
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{
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VTKM_ASSERT(index >= 0 && index < this->NumComponents);
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return this->Data[index];
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}
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VTKM_EXEC_CONT
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void Append(ComponentType value)
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{
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VTKM_ASSERT(this->NumComponents < MaxSize);
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this->Data[this->NumComponents] = value;
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this->NumComponents++;
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}
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private:
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vtkm::Vec<T, MaxSize> Data;
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vtkm::IdComponent NumComponents;
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};
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template <typename T, vtkm::IdComponent MaxSize>
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struct TypeTraits<vtkm::VecVariable<T, MaxSize>>
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{
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using NumericTag = typename vtkm::TypeTraits<T>::NumericTag;
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using DimensionalityTag = TypeTraitsVectorTag;
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VTKM_EXEC_CONT
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static vtkm::VecVariable<T, MaxSize> ZeroInitialization()
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{
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return vtkm::VecVariable<T, MaxSize>();
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}
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};
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template <typename T, vtkm::IdComponent MaxSize>
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struct VecTraits<vtkm::VecVariable<T, MaxSize>>
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{
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using VecType = vtkm::VecVariable<T, MaxSize>;
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using ComponentType = typename VecType::ComponentType;
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using BaseComponentType = typename vtkm::VecTraits<ComponentType>::BaseComponentType;
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using HasMultipleComponents = vtkm::VecTraitsTagMultipleComponents;
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using IsSizeStatic = vtkm::VecTraitsTagSizeVariable;
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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_EXEC_CONT
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static const 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_EXEC_CONT
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static ComponentType& GetComponent(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_EXEC_CONT
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static void SetComponent(VecType& vector,
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vtkm::IdComponent componentIndex,
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const ComponentType& value)
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{
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vector[componentIndex] = value;
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}
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template <typename NewComponentType>
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using ReplaceComponentType = vtkm::VecVariable<NewComponentType, MaxSize>;
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template <typename NewComponentType>
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using ReplaceBaseComponentType = vtkm::VecVariable<
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typename vtkm::VecTraits<ComponentType>::template ReplaceBaseComponentType<NewComponentType>,
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MaxSize>;
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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_VecVariable_h
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