mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 18:45:43 +00:00
313 lines
11 KiB
C++
313 lines
11 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_ScatterCounting_h
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#define vtk_m_worklet_ScatterCounting_h
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/ArrayHandleCast.h>
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#include <vtkm/cont/ArrayHandleIndex.h>
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#include <vtkm/cont/DeviceAdapterAlgorithm.h>
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#include <vtkm/cont/ErrorBadValue.h>
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#include <vtkm/exec/FunctorBase.h>
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#include <sstream>
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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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template <typename Device>
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struct ReverseInputToOutputMapKernel : vtkm::exec::FunctorBase
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{
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using InputMapType =
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typename vtkm::cont::ArrayHandle<vtkm::Id>::ExecutionTypes<Device>::PortalConst;
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using OutputMapType = typename vtkm::cont::ArrayHandle<vtkm::Id>::ExecutionTypes<Device>::Portal;
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using VisitType =
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typename vtkm::cont::ArrayHandle<vtkm::IdComponent>::ExecutionTypes<Device>::Portal;
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InputMapType InputToOutputMap;
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OutputMapType OutputToInputMap;
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VisitType Visit;
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vtkm::Id OutputSize;
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VTKM_CONT
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ReverseInputToOutputMapKernel(const InputMapType& inputToOutputMap,
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const OutputMapType& outputToInputMap, const VisitType& visit,
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vtkm::Id outputSize)
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: InputToOutputMap(inputToOutputMap)
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, OutputToInputMap(outputToInputMap)
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, Visit(visit)
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, OutputSize(outputSize)
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{
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}
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VTKM_EXEC
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void operator()(vtkm::Id inputIndex) const
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{
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vtkm::Id outputStartIndex;
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if (inputIndex > 0)
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{
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outputStartIndex = this->InputToOutputMap.Get(inputIndex - 1);
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}
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else
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{
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outputStartIndex = 0;
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}
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vtkm::Id outputEndIndex = this->InputToOutputMap.Get(inputIndex);
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vtkm::IdComponent visitIndex = 0;
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for (vtkm::Id outputIndex = outputStartIndex; outputIndex < outputEndIndex; outputIndex++)
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{
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this->OutputToInputMap.Set(outputIndex, inputIndex);
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this->Visit.Set(outputIndex, visitIndex);
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visitIndex++;
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}
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}
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};
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template <typename Device>
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struct SubtractToVisitIndexKernel : vtkm::exec::FunctorBase
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{
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using StartsOfGroupsType =
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typename vtkm::cont::ArrayHandle<vtkm::Id>::ExecutionTypes<Device>::PortalConst;
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using VisitType =
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typename vtkm::cont::ArrayHandle<vtkm::IdComponent>::ExecutionTypes<Device>::Portal;
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StartsOfGroupsType StartsOfGroups;
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VisitType Visit;
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VTKM_CONT
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SubtractToVisitIndexKernel(const StartsOfGroupsType& startsOfGroups, const VisitType& visit)
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: StartsOfGroups(startsOfGroups)
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, Visit(visit)
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{
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}
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VTKM_EXEC
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void operator()(vtkm::Id inputIndex) const
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{
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vtkm::Id startOfGroup = this->StartsOfGroups.Get(inputIndex);
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vtkm::IdComponent visitIndex = static_cast<vtkm::IdComponent>(inputIndex - startOfGroup);
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this->Visit.Set(inputIndex, visitIndex);
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}
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};
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template <typename Device>
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struct AdjustMapByOne : vtkm::exec::FunctorBase
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{
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using OffByOnePortalType =
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typename vtkm::cont::ArrayHandle<vtkm::Id>::ExecutionTypes<Device>::PortalConst;
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using CorrectedPortalType =
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typename vtkm::cont::ArrayHandle<vtkm::Id>::ExecutionTypes<Device>::Portal;
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OffByOnePortalType MapOffByOne;
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CorrectedPortalType MapCorrected;
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VTKM_CONT
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AdjustMapByOne(const OffByOnePortalType& mapOffByOne, const CorrectedPortalType& mapCorrected)
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: MapOffByOne(mapOffByOne)
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, MapCorrected(mapCorrected)
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{
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}
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VTKM_EXEC
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void operator()(vtkm::Id index) const
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{
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if (index != 0)
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{
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this->MapCorrected.Set(index, this->MapOffByOne.Get(index - 1));
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}
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else
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{
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this->MapCorrected.Set(0, 0);
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}
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}
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};
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} // namespace detail
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/// \brief A scatter that maps input to some 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 ScatterCounting establishes a 1 to
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/// N mapping from input to output. That is, every input element generates 0 or
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/// more output elements associated with it. The output elements are grouped by
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/// the input associated.
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///
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/// A counting scatter takes an array of counts for each input. The data is
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/// taken in the constructor and the index arrays are derived from that. So
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/// changing the counts after the scatter is created will have no effect.
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///
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struct ScatterCounting
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{
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/// Construct a \c ScatterCounting object using an array of counts for the
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/// number of outputs for each input. Part of the construction requires
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/// generating an input to output map, but this map is not needed for the
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/// operations of \c ScatterCounting, so by default it is deleted. However,
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/// other users might make use of it, so you can instruct the constructor
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/// to save the input to output map.
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///
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template <typename CountArrayType, typename Device>
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VTKM_CONT ScatterCounting(const CountArrayType& countArray, Device,
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bool saveInputToOutputMap = false)
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{
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this->BuildArrays(countArray, Device(), saveInputToOutputMap);
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}
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typedef vtkm::cont::ArrayHandle<vtkm::Id> OutputToInputMapType;
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template <typename RangeType>
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VTKM_CONT OutputToInputMapType GetOutputToInputMap(RangeType) const
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{
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return this->OutputToInputMap;
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}
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typedef vtkm::cont::ArrayHandle<vtkm::IdComponent> VisitArrayType;
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template <typename RangeType>
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VTKM_CONT VisitArrayType GetVisitArray(RangeType) const
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{
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return this->VisitArray;
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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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if (inputRange != this->InputRange)
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{
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std::stringstream msg;
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msg << "ScatterCounting initialized with input domain of size " << this->InputRange
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<< " but used with a worklet invoke of size " << inputRange << std::endl;
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throw vtkm::cont::ErrorBadValue(msg.str());
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}
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return this->VisitArray.GetNumberOfValues();
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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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VTKM_CONT
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OutputToInputMapType GetOutputToInputMap() const { return this->OutputToInputMap; }
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/// This array will not be valid unless explicitly instructed to be saved.
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/// (See documentation for the constructor.)
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///
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VTKM_CONT
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vtkm::cont::ArrayHandle<vtkm::Id> GetInputToOutputMap() const { return this->InputToOutputMap; }
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private:
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vtkm::Id InputRange;
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vtkm::cont::ArrayHandle<vtkm::Id> InputToOutputMap;
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OutputToInputMapType OutputToInputMap;
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VisitArrayType VisitArray;
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template <typename CountArrayType, typename Device>
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VTKM_CONT void BuildArrays(const CountArrayType& count, Device, bool saveInputToOutputMap)
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{
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VTKM_IS_ARRAY_HANDLE(CountArrayType);
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VTKM_IS_DEVICE_ADAPTER_TAG(Device);
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this->InputRange = count.GetNumberOfValues();
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// The input to output map is actually built off by one. The first entry
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// is actually for the second value. The last entry is the total number of
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// output. This off-by-one is so that an upper bound find will work when
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// building the output to input map. Later we will either correct the
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// map or delete it.
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vtkm::cont::ArrayHandle<vtkm::Id> inputToOutputMapOffByOne;
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vtkm::Id outputSize = vtkm::cont::DeviceAdapterAlgorithm<Device>::ScanInclusive(
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vtkm::cont::make_ArrayHandleCast(count, vtkm::Id()), inputToOutputMapOffByOne);
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// We have implemented two different ways to compute the output to input
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// map. The first way is to use a binary search on each output index into
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// the input map. The second way is to schedule on each input and
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// iteratively fill all the output indices for that input. The first way is
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// faster for output sizes that are small relative to the input (typical in
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// Marching Cubes, for example) and also tends to be well load balanced.
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// The second way is faster for larger outputs (typical in triangulation,
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// for example). We will use the first method for small output sizes and
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// the second for large output sizes. Toying with this might be a good
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// place for optimization.
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if (outputSize < this->InputRange)
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{
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this->BuildOutputToInputMapWithFind(outputSize, inputToOutputMapOffByOne, Device());
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}
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else
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{
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this->BuildOutputToInputMapWithIterate(outputSize, inputToOutputMapOffByOne, Device());
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}
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if (saveInputToOutputMap)
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{
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// Since we are saving it, correct the input to output map.
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detail::AdjustMapByOne<Device> kernel(
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inputToOutputMapOffByOne.PrepareForInput(Device()),
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this->InputToOutputMap.PrepareForOutput(this->InputRange, Device()));
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vtkm::cont::DeviceAdapterAlgorithm<Device>::Schedule(kernel, this->InputRange);
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}
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}
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template <typename Device>
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VTKM_CONT void BuildOutputToInputMapWithFind(
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vtkm::Id outputSize, vtkm::cont::ArrayHandle<vtkm::Id> inputToOutputMapOffByOne, Device)
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{
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vtkm::cont::ArrayHandleIndex outputIndices(outputSize);
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vtkm::cont::DeviceAdapterAlgorithm<Device>::UpperBounds(inputToOutputMapOffByOne, outputIndices,
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this->OutputToInputMap);
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vtkm::cont::ArrayHandle<vtkm::Id> startsOfGroups;
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// This find gives the index of the start of a group.
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vtkm::cont::DeviceAdapterAlgorithm<Device>::LowerBounds(this->OutputToInputMap,
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this->OutputToInputMap, startsOfGroups);
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detail::SubtractToVisitIndexKernel<Device> kernel(
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startsOfGroups.PrepareForInput(Device()),
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this->VisitArray.PrepareForOutput(outputSize, Device()));
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vtkm::cont::DeviceAdapterAlgorithm<Device>::Schedule(kernel, outputSize);
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}
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template <typename Device>
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VTKM_CONT void BuildOutputToInputMapWithIterate(
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vtkm::Id outputSize, vtkm::cont::ArrayHandle<vtkm::Id> inputToOutputMapOffByOne, Device)
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{
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detail::ReverseInputToOutputMapKernel<Device> kernel(
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inputToOutputMapOffByOne.PrepareForInput(Device()),
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this->OutputToInputMap.PrepareForOutput(outputSize, Device()),
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this->VisitArray.PrepareForOutput(outputSize, Device()), outputSize);
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vtkm::cont::DeviceAdapterAlgorithm<Device>::Schedule(
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kernel, inputToOutputMapOffByOne.GetNumberOfValues());
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}
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};
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}
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} // namespace vtkm::worklet
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#endif //vtk_m_worklet_ScatterCounting_h
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