mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 10:35:42 +00:00
119 lines
3.3 KiB
C++
119 lines
3.3 KiB
C++
//=============================================================================
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//
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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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// Copyright 2015 Sandia Corporation.
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// Copyright 2015 UT-Battelle, LLC.
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// Copyright 2015 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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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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//=============================================================================
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#ifndef vtk_m_worklet_ScatterUniform_h
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#define vtk_m_worklet_ScatterUniform_h
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/ArrayHandleCounting.h>
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#include <vtkm/cont/ArrayHandleImplicit.h>
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namespace vtkm
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{
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namespace worklet
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{
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namespace detail
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{
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struct FunctorModulus
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{
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vtkm::IdComponent Modulus;
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VTKM_EXEC_CONT
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FunctorModulus(vtkm::IdComponent modulus = 1)
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: Modulus(modulus)
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{
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}
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VTKM_EXEC_CONT
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vtkm::IdComponent operator()(vtkm::Id index) const
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{
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return static_cast<vtkm::IdComponent>(index % this->Modulus);
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}
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};
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struct FunctorDiv
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{
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vtkm::Id Divisor;
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VTKM_EXEC_CONT
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FunctorDiv(vtkm::Id divisor = 1)
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: Divisor(divisor)
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{
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}
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VTKM_EXEC_CONT
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vtkm::Id operator()(vtkm::Id index) const { return index / this->Divisor; }
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};
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}
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/// \brief A scatter that maps input to some constant numbers of output.
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///
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/// The \c Scatter classes are responsible for defining how much output is
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/// generated based on some sized input. \c ScatterUniform establishes a 1 to N
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/// mapping from input to output. That is, every input element generates N
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/// elements associated with it where N is the same for every input. The output
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/// elements are grouped by the input associated.
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///
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struct ScatterUniform
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{
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VTKM_CONT
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ScatterUniform(vtkm::IdComponent numOutputsPerInput)
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: NumOutputsPerInput(numOutputsPerInput)
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{
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}
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VTKM_CONT
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vtkm::Id GetOutputRange(vtkm::Id inputRange) const
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{
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return inputRange * this->NumOutputsPerInput;
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}
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VTKM_CONT
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vtkm::Id GetOutputRange(vtkm::Id3 inputRange) const
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{
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return this->GetOutputRange(inputRange[0] * inputRange[1] * inputRange[2]);
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}
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typedef vtkm::cont::ArrayHandleImplicit<vtkm::Id, detail::FunctorDiv> OutputToInputMapType;
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template <typename RangeType>
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VTKM_CONT OutputToInputMapType GetOutputToInputMap(RangeType inputRange) const
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{
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return OutputToInputMapType(detail::FunctorDiv(this->NumOutputsPerInput),
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this->GetOutputRange(inputRange));
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}
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typedef vtkm::cont::ArrayHandleImplicit<vtkm::IdComponent, detail::FunctorModulus> VisitArrayType;
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template <typename RangeType>
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VTKM_CONT VisitArrayType GetVisitArray(RangeType inputRange) const
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{
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return VisitArrayType(detail::FunctorModulus(this->NumOutputsPerInput),
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this->GetOutputRange(inputRange));
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}
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private:
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vtkm::IdComponent NumOutputsPerInput;
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};
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}
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} // namespace vtkm::worklet
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#endif //vtk_m_worklet_ScatterUniform_h
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