ScatterCounting.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_ScatterCounting_h
#define viskores_worklet_ScatterCounting_h
 
#include <viskores/worklet/internal/ScatterBase.h>
#include <viskores/worklet/viskores_worklet_export.h>
 
#include <viskores/cont/UnknownArrayHandle.h>
 
#include <sstream>
 
namespace viskores
{
namespace worklet
{
 
namespace detail
{
 
struct ScatterCountingBuilder;
 
} // namespace detail
 
struct VISKORES_WORKLET_EXPORT ScatterCounting : internal::ScatterBase
{
  using CountTypes = viskores::List<viskores::Int64,
                                    viskores::Int32,
                                    viskores::Int16,
                                    viskores::Int8,
                                    viskores::UInt64,
                                    viskores::UInt32,
                                    viskores::UInt16,
                                    viskores::UInt8>;
 
  VISKORES_CONT ScatterCounting(
    const viskores::cont::UnknownArrayHandle& countArray,
    viskores::cont::DeviceAdapterId device = viskores::cont::DeviceAdapterTagAny(),
    bool saveInputToOutputMap = false)
  {
    this->BuildArrays(countArray, device, saveInputToOutputMap);
  }
  VISKORES_CONT ScatterCounting(const viskores::cont::UnknownArrayHandle& countArray,
                                bool saveInputToOutputMap)
  {
    this->BuildArrays(countArray, viskores::cont::DeviceAdapterTagAny(), saveInputToOutputMap);
  }
 
  using OutputToInputMapType = viskores::cont::ArrayHandle<viskores::Id>;
 
  template <typename RangeType>
  VISKORES_CONT OutputToInputMapType GetOutputToInputMap(RangeType) const
  {
    return this->OutputToInputMap;
  }
 
  using VisitArrayType = viskores::cont::ArrayHandle<viskores::IdComponent>;
  template <typename RangeType>
  VISKORES_CONT VisitArrayType GetVisitArray(RangeType) const
  {
    return this->VisitArray;
  }
 
  VISKORES_CONT
  viskores::Id GetOutputRange(viskores::Id inputRange) const
  {
    if (inputRange != this->InputRange)
    {
      std::stringstream msg;
      msg << "ScatterCounting initialized with input domain of size " << this->InputRange
          << " but used with a worklet invoke of size " << inputRange << std::endl;
      throw viskores::cont::ErrorBadValue(msg.str());
    }
    return this->VisitArray.GetNumberOfValues();
  }
  VISKORES_CONT
  viskores::Id GetOutputRange(viskores::Id3 inputRange) const
  {
    return this->GetOutputRange(inputRange[0] * inputRange[1] * inputRange[2]);
  }
 
  VISKORES_CONT
  OutputToInputMapType GetOutputToInputMap() const { return this->OutputToInputMap; }
 
  VISKORES_CONT
  viskores::cont::ArrayHandle<viskores::Id> GetInputToOutputMap() const
  {
    return this->InputToOutputMap;
  }
 
private:
  viskores::Id InputRange;
  viskores::cont::ArrayHandle<viskores::Id> InputToOutputMap;
  OutputToInputMapType OutputToInputMap;
  VisitArrayType VisitArray;
 
  friend struct detail::ScatterCountingBuilder;
 
  VISKORES_CONT void BuildArrays(const viskores::cont::UnknownArrayHandle& countArray,
                                 viskores::cont::DeviceAdapterId device,
                                 bool saveInputToOutputMap);
};
}
} // namespace viskores::worklet
 
#endif //viskores_worklet_ScatterCounting_h