InputIndex.h

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//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt for details.
//
//  This software is distributed WITHOUT ANY WARRANTY; without even
//  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
//  PURPOSE.  See the above copyright notice for more information.
//============================================================================
#ifndef vtk_m_exec_arg_InputIndex_h
#define vtk_m_exec_arg_InputIndex_h
 
#include <vtkm/exec/arg/ExecutionSignatureTagBase.h>
#include <vtkm/exec/arg/Fetch.h>
 
namespace vtkm
{
namespace exec
{
namespace arg
{
 
struct AspectTagInputIndex
{
};
 
struct InputIndex : vtkm::exec::arg::ExecutionSignatureTagBase
{
  // The index does not really matter because the fetch is going to ignore it.
  // However, it still has to point to a valid parameter in the
  // ControlSignature because the templating is going to grab a fetch tag
  // whether we use it or not. 1 should be guaranteed to be valid since you
  // need at least one argument for the input domain.
  static constexpr vtkm::IdComponent INDEX = 1;
  using AspectTag = vtkm::exec::arg::AspectTagInputIndex;
};
 
template <typename FetchTag, typename ExecObjectType>
struct Fetch<FetchTag, vtkm::exec::arg::AspectTagInputIndex, ExecObjectType>
{
  using ValueType = vtkm::Id;
 
  template <typename ThreadIndicesType>
  VTKM_EXEC vtkm::Id Load(const ThreadIndicesType& indices, const ExecObjectType&) const
  {
    return indices.GetInputIndex();
  }
 
  template <typename ThreadIndicesType>
  VTKM_EXEC void Store(const ThreadIndicesType&, const ExecObjectType&, const ValueType&) const
  {
    // Store is a no-op.
  }
};
}
}
} // namespace vtkm::exec::arg
 
#endif //vtk_m_exec_arg_InputIndex_h