d7b4390d15
This allows us to support `Fill` in `ArrayHandleView` and `ArrayHandleReverse`.
183 lines
5.1 KiB
C++
183 lines
5.1 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_cont_ArrayHandleDiscard_h
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#define vtk_m_cont_ArrayHandleDiscard_h
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#include <vtkm/TypeTraits.h>
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/internal/Unreachable.h>
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#include <type_traits>
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namespace vtkm
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{
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namespace exec
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{
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namespace internal
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{
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/// \brief An output-only array portal with no storage. All written values are
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/// discarded.
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template <typename ValueType_>
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class ArrayPortalDiscard
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{
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public:
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using ValueType = ValueType_;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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ArrayPortalDiscard()
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: NumberOfValues(0)
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{
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} // needs to be host and device so that cuda can create lvalue of these
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VTKM_CONT
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explicit ArrayPortalDiscard(vtkm::Id numValues)
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: NumberOfValues(numValues)
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{
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}
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/// Copy constructor for any other ArrayPortalDiscard with an iterator
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/// type that can be copied to this iterator type. This allows us to do any
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/// type casting that the iterators do (like the non-const to const cast).
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///
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template <class OtherV>
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VTKM_CONT ArrayPortalDiscard(const ArrayPortalDiscard<OtherV>& src)
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: NumberOfValues(src.NumberOfValues)
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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->NumberOfValues; }
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ValueType Get(vtkm::Id) const
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{
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VTKM_UNREACHABLE("Cannot read from ArrayHandleDiscard.");
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return vtkm::TypeTraits<ValueType>::ZeroInitialization();
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}
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VTKM_EXEC
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void Set(vtkm::Id index, const ValueType&) const
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{
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VTKM_ASSERT(index < this->GetNumberOfValues());
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(void)index;
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// no-op
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}
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private:
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vtkm::Id NumberOfValues;
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};
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} // end namespace internal
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} // end namespace exec
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namespace cont
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{
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namespace internal
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{
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struct VTKM_ALWAYS_EXPORT StorageTagDiscard
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{
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};
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struct VTKM_ALWAYS_EXPORT DiscardMetaData
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{
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vtkm::Id NumberOfValues = 0;
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};
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template <typename ValueType>
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class Storage<ValueType, StorageTagDiscard>
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{
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public:
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using WritePortalType = vtkm::exec::internal::ArrayPortalDiscard<ValueType>;
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// Note that this portal is write-only, so you will probably run into problems if
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// you actually try to use this read portal.
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using ReadPortalType = vtkm::exec::internal::ArrayPortalDiscard<ValueType>;
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VTKM_CONT constexpr static vtkm::IdComponent GetNumberOfBuffers() { return 1; }
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VTKM_CONT static void ResizeBuffers(vtkm::Id numValues,
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vtkm::cont::internal::Buffer* buffers,
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vtkm::CopyFlag,
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vtkm::cont::Token&)
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{
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VTKM_ASSERT(numValues >= 0);
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buffers[0].GetMetaData<DiscardMetaData>().NumberOfValues = numValues;
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}
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VTKM_CONT static vtkm::Id GetNumberOfValues(const vtkm::cont::internal::Buffer* buffers)
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{
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return buffers[0].GetMetaData<DiscardMetaData>().NumberOfValues;
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}
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VTKM_CONT static void Fill(vtkm::cont::internal::Buffer*,
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const ValueType&,
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vtkm::Id,
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vtkm::Id,
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vtkm::cont::Token&)
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{
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// Fill is a NO-OP.
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}
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VTKM_CONT static ReadPortalType CreateReadPortal(const vtkm::cont::internal::Buffer*,
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vtkm::cont::DeviceAdapterId,
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vtkm::cont::Token&)
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{
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throw vtkm::cont::ErrorBadValue("Cannot read from ArrayHandleDiscard.");
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}
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VTKM_CONT static WritePortalType CreateWritePortal(vtkm::cont::internal::Buffer* buffers,
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vtkm::cont::DeviceAdapterId,
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vtkm::cont::Token&)
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{
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return WritePortalType(GetNumberOfValues(buffers));
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}
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};
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template <typename ValueType_>
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struct ArrayHandleDiscardTraits
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{
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using ValueType = ValueType_;
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using StorageTag = StorageTagDiscard;
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using Superclass = vtkm::cont::ArrayHandle<ValueType, StorageTag>;
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};
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} // end namespace internal
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/// ArrayHandleDiscard is a write-only array that discards all data written to
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/// it. This can be used to save memory when a filter provides optional outputs
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/// that are not needed.
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template <typename ValueType_>
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class ArrayHandleDiscard : public internal::ArrayHandleDiscardTraits<ValueType_>::Superclass
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{
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public:
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VTKM_ARRAY_HANDLE_SUBCLASS(ArrayHandleDiscard,
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(ArrayHandleDiscard<ValueType_>),
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(typename internal::ArrayHandleDiscardTraits<ValueType_>::Superclass));
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};
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/// Helper to determine if an ArrayHandle type is an ArrayHandleDiscard.
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template <typename T>
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struct IsArrayHandleDiscard : std::false_type
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{
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};
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template <typename T>
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struct IsArrayHandleDiscard<ArrayHandle<T, internal::StorageTagDiscard>> : std::true_type
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{
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};
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} // end namespace cont
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} // end namespace vtkm
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#endif // vtk_m_cont_ArrayHandleDiscard_h
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