ScatterPermutation.h

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//============================================================================
//  The contents of this file are covered by the Viskores license. See
//  LICENSE.txt for details.
//
//  By contributing to this file, all contributors agree to the Developer
//  Certificate of Origin Version 1.1 (DCO 1.1) as stated in DCO.txt.
//============================================================================
 
//============================================================================
//  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 viskores_worklet_ScatterPermutation_h
#define viskores_worklet_ScatterPermutation_h
 
#include <viskores/cont/ArrayHandle.h>
#include <viskores/cont/ArrayHandleConstant.h>
#include <viskores/worklet/internal/ScatterBase.h>
 
namespace viskores
{
namespace worklet
{
 
template <typename PermutationStorage = VISKORES_DEFAULT_STORAGE_TAG>
class ScatterPermutation : public internal::ScatterBase
{
private:
  using PermutationArrayHandle = viskores::cont::ArrayHandle<viskores::Id, PermutationStorage>;
 
public:
  using OutputToInputMapType = PermutationArrayHandle;
  using VisitArrayType = viskores::cont::ArrayHandleConstant<viskores::IdComponent>;
 
  ScatterPermutation(const PermutationArrayHandle& permutation)
    : Permutation(permutation)
  {
  }
 
  VISKORES_CONT
  template <typename RangeType>
  viskores::Id GetOutputRange(RangeType) const
  {
    return this->Permutation.GetNumberOfValues();
  }
 
  template <typename RangeType>
  VISKORES_CONT OutputToInputMapType GetOutputToInputMap(RangeType) const
  {
    return this->Permutation;
  }
 
  VISKORES_CONT OutputToInputMapType GetOutputToInputMap() const { return this->Permutation; }
 
  VISKORES_CONT
  VisitArrayType GetVisitArray(viskores::Id inputRange) const
  {
    return VisitArrayType(0, this->GetOutputRange(inputRange));
  }
 
  VISKORES_CONT
  VisitArrayType GetVisitArray(viskores::Id3 inputRange) const
  {
    return this->GetVisitArray(inputRange[0] * inputRange[1] * inputRange[2]);
  }
 
private:
  PermutationArrayHandle Permutation;
};
}
} // viskores::worklet
 
#endif // viskores_worklet_ScatterPermutation_h