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https://gitlab.kitware.com/vtk/vtk-m
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c3a3184d51
Sandia National Laboratories recently changed management from the Sandia Corporation to the National Technology & Engineering Solutions of Sandia, LLC (NTESS). The copyright statements need to be updated accordingly.
188 lines
5.4 KiB
C++
188 lines
5.4 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 2014 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 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_exec_cuda_internal_IteratorFromArrayPortal_h
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#define vtk_m_exec_cuda_internal_IteratorFromArrayPortal_h
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#include <vtkm/Pair.h>
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#include <vtkm/Types.h>
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#include <vtkm/internal/ExportMacros.h>
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// Disable warnings we check vtkm for but Thrust does not.
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VTKM_THIRDPARTY_PRE_INCLUDE
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#include <thrust/functional.h>
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#include <thrust/iterator/iterator_facade.h>
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#include <thrust/system/cuda/execution_policy.h>
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VTKM_THIRDPARTY_POST_INCLUDE
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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 cuda
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{
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namespace internal
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{
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template <class ArrayPortalType>
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struct PortalValue
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{
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using ValueType = typename ArrayPortalType::ValueType;
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VTKM_EXEC_CONT
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PortalValue(const ArrayPortalType& portal, vtkm::Id index)
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: Portal(portal)
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, Index(index)
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{
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}
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VTKM_EXEC
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void Swap(PortalValue<ArrayPortalType>& rhs) throw()
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{
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//we need use the explicit type not a proxy temp object
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//A proxy temp object would point to the same underlying data structure
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//and would not hold the old value of *this once *this was set to rhs.
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const ValueType aValue = *this;
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*this = rhs;
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rhs = aValue;
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}
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VTKM_EXEC
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PortalValue<ArrayPortalType>& operator=(const PortalValue<ArrayPortalType>& rhs)
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{
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this->Portal.Set(this->Index, rhs.Portal.Get(rhs.Index));
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return *this;
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}
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VTKM_EXEC
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ValueType operator=(const ValueType& value) const
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{
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this->Portal.Set(this->Index, value);
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return value;
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}
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VTKM_EXEC
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operator ValueType(void) const { return this->Portal.Get(this->Index); }
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const ArrayPortalType& Portal;
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vtkm::Id Index;
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};
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template <class ArrayPortalType>
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class IteratorFromArrayPortal
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: public ::thrust::iterator_facade<IteratorFromArrayPortal<ArrayPortalType>,
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typename ArrayPortalType::ValueType,
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::thrust::system::cuda::tag,
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::thrust::random_access_traversal_tag,
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PortalValue<ArrayPortalType>,
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std::ptrdiff_t>
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{
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public:
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VTKM_EXEC_CONT
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IteratorFromArrayPortal()
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: Portal()
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, Index(0)
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{
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}
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VTKM_CONT
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explicit IteratorFromArrayPortal(const ArrayPortalType& portal, vtkm::Id index = 0)
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: Portal(portal)
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, Index(index)
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{
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}
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VTKM_EXEC
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PortalValue<ArrayPortalType> operator[](std::ptrdiff_t idx) const //NEEDS to be signed
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{
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return PortalValue<ArrayPortalType>(this->Portal, this->Index + static_cast<vtkm::Id>(idx));
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}
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private:
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ArrayPortalType Portal;
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vtkm::Id Index;
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// Implementation for ::thrust iterator_facade
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friend class ::thrust::iterator_core_access;
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VTKM_EXEC
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PortalValue<ArrayPortalType> dereference() const
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{
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return PortalValue<ArrayPortalType>(this->Portal, this->Index);
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}
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VTKM_EXEC
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bool equal(const IteratorFromArrayPortal<ArrayPortalType>& other) const
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{
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// Technically, we should probably check that the portals are the same,
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// but the portal interface does not specify an equal operator. It is
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// by its nature undefined what happens when comparing iterators from
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// different portals anyway.
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return (this->Index == other.Index);
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}
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VTKM_EXEC_CONT
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void increment() { this->Index++; }
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VTKM_EXEC_CONT
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void decrement() { this->Index--; }
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VTKM_EXEC_CONT
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void advance(std::ptrdiff_t delta) { this->Index += static_cast<vtkm::Id>(delta); }
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VTKM_EXEC_CONT
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std::ptrdiff_t distance_to(const IteratorFromArrayPortal<ArrayPortalType>& other) const
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{
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// Technically, we should probably check that the portals are the same,
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// but the portal interface does not specify an equal operator. It is
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// by its nature undefined what happens when comparing iterators from
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// different portals anyway.
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return static_cast<std::ptrdiff_t>(other.Index - this->Index);
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}
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};
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}
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}
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}
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} //namespace vtkm::exec::cuda::internal
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//So for the unary_transform_functor and binary_transform_functor inside
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//of thrust, they verify that the index they are storing into is a reference
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//instead of a value, so that the contents actually are written to global memory.
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//
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//But for vtk-m we pass in facade objects, which are passed by value, but
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//must be treated as references. So do to do that properly we need to specialize
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//is_non_const_reference to state a PortalValue by value is valid for writing
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namespace thrust
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{
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namespace detail
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{
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template <typename T>
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struct is_non_const_reference;
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template <typename T>
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struct is_non_const_reference<vtkm::exec::cuda::internal::PortalValue<T>>
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: thrust::detail::true_type
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{
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};
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}
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}
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#endif //vtk_m_exec_cuda_internal_IteratorFromArrayPortal_h
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