b934c1c71b
Without requiring c++11 we can't properly provided default device adapters to templated functions.
205 lines
6.8 KiB
C++
205 lines
6.8 KiB
C++
//============================================================================
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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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// 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 2014 Sandia Corporation.
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 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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//
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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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#ifndef vtk_m_worklet_FieldHistogram_h
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#define vtk_m_worklet_FieldHistogram_h
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#include <vtkm/Math.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/worklet/DispatcherMapField.h>
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#include <vtkm/worklet/WorkletMapField.h>
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#include <vtkm/cont/DeviceAdapterAlgorithm.h>
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#include <vtkm/cont/Field.h>
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#ifndef VTKM_DEVICE_ADAPTER
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#define VTKM_DEVICE_ADAPTER VTKM_DEVICE_ADAPTER_SERIAL
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#endif
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typedef VTKM_DEFAULT_DEVICE_ADAPTER_TAG DeviceAdapter;
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namespace
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{
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// GCC creates false positive warnings for signed/unsigned char* operations.
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// This occurs because the values are implicitly casted up to int's for the
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// operation, and than casted back down to char's when return.
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// This causes a false positive warning, even when the values is within
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// the value types range
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#if defined(VTKM_GCC)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wconversion"
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#endif // gcc
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template<typename T>
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T compute_delta(T fieldMinValue, T fieldMaxValue, vtkm::Id num)
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{ typedef vtkm::VecTraits<T> VecType;
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const T fieldRange = fieldMaxValue - fieldMinValue;
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return fieldRange / static_cast<typename VecType::ComponentType>(num);
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}
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#if defined(VTKM_GCC)
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#pragma GCC diagnostic pop
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#endif // gcc
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}
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namespace vtkm {
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namespace worklet {
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//simple functor that prints basic statistics
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class FieldHistogram
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{
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public:
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struct minFunctor
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{
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template< typename FieldType>
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VTKM_EXEC_EXPORT
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FieldType operator()(const FieldType &x, const FieldType &y) const {
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return vtkm::Min(x, y);
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}
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};
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struct maxFunctor
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{
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template< typename FieldType>
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VTKM_EXEC_EXPORT
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FieldType operator()(const FieldType& x, const FieldType& y) const {
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return vtkm::Max(x, y);
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}
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};
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// For each value set the bin it should be in
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template<typename FieldType>
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class SetHistogramBin : public vtkm::worklet::WorkletMapField
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{
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public:
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typedef void ControlSignature(FieldIn<> value,
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FieldOut<> binIndex);
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typedef void ExecutionSignature(_1,_2);
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typedef _1 InputDomain;
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vtkm::Id numberOfBins;
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FieldType minValue;
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FieldType delta;
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VTKM_CONT_EXPORT
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SetHistogramBin(
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vtkm::Id numberOfBins0,
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FieldType minValue0,
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FieldType delta0) :
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numberOfBins(numberOfBins0),
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minValue(minValue0),
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delta(delta0) {}
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VTKM_EXEC_EXPORT
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void operator()(const FieldType &value, vtkm::Id &binIndex) const
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{
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binIndex = static_cast<vtkm::Id>((value - minValue) / delta);
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if (binIndex < 0)
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binIndex = 0;
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else if (binIndex >= numberOfBins)
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binIndex = numberOfBins - 1;
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}
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};
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// Calculate the adjacent difference between values in ArrayHandle
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class AdjacentDifference : public vtkm::worklet::WorkletMapField
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{
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public:
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typedef void ControlSignature(FieldIn<IdType> inputIndex,
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FieldOut<IdType> outputCount);
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typedef void ExecutionSignature(_1,_2);
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typedef _1 InputDomain;
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typedef vtkm::cont::ArrayHandle<vtkm::Id>::ExecutionTypes<DeviceAdapter>::PortalConst IdPortalType;
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IdPortalType totalCountArray;
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VTKM_CONT_EXPORT
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AdjacentDifference(IdPortalType totalCount) :
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totalCountArray(totalCount) { }
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VTKM_EXEC_EXPORT
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void operator()(const vtkm::Id &index, vtkm::Id & difference) const
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{
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if (index == 0)
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difference = this->totalCountArray.Get(index);
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else
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difference = this->totalCountArray.Get(index) - this->totalCountArray.Get(index - 1);
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}
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};
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// Execute the histogram binning filter given data and number of bins
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// Returns:
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// min value of the bins
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// delta/range of each bin
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// number of values in each bin
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template<typename FieldType, typename Storage, typename DeviceAdapter>
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void Run(vtkm::cont::ArrayHandle<FieldType, Storage> fieldArray,
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vtkm::Id numberOfBins,
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vtkm::Range& rangeOfValues,
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FieldType& binDelta,
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vtkm::cont::ArrayHandle<vtkm::Id>& binArray,
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DeviceAdapter device)
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{
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(void) device;
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typedef typename vtkm::cont::DeviceAdapterAlgorithm<DeviceAdapter> DeviceAlgorithms;
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//todo: need to have a signature that can use an input range so we can
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//leverage fields that have already computed there range
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const vtkm::Id numberOfValues = fieldArray.GetNumberOfValues();
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const FieldType initValue = fieldArray.GetPortalConstControl().Get(0);
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const FieldType fieldMinValue = DeviceAlgorithms::Reduce(fieldArray, initValue, minFunctor());
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const FieldType fieldMaxValue = DeviceAlgorithms::Reduce(fieldArray, initValue, maxFunctor());
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const FieldType fieldDelta = compute_delta(fieldMinValue, fieldMaxValue, numberOfBins);
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// Worklet fills in the bin belonging to each value
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vtkm::cont::ArrayHandle<vtkm::Id> binIndex;
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binIndex.Allocate(numberOfValues);
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// Worklet to set the bin number for each data value
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SetHistogramBin<FieldType> binWorklet(numberOfBins, fieldMinValue, fieldDelta);
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vtkm::worklet::DispatcherMapField< SetHistogramBin<FieldType> > setHistogramBinDispatcher(binWorklet);
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setHistogramBinDispatcher.Invoke(fieldArray, binIndex);
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// Sort the resulting bin array for counting
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DeviceAlgorithms::Sort(binIndex);
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// Get the upper bound of each bin number
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vtkm::cont::ArrayHandle<vtkm::Id> totalCount;
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vtkm::cont::ArrayHandleCounting<vtkm::Id> binCounter(0, 1, numberOfBins);
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DeviceAlgorithms::UpperBounds(binIndex, binCounter, totalCount);
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// Difference between adjacent items is the bin count
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vtkm::worklet::DispatcherMapField<AdjacentDifference>
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adjacentDifferenceDispatcher(AdjacentDifference(totalCount.PrepareForInput(DeviceAdapter())));
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adjacentDifferenceDispatcher.Invoke(binCounter, binArray);
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//update the users data
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rangeOfValues = vtkm::Range( fieldMinValue, fieldMaxValue );
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binDelta = fieldDelta;
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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_FieldHistogram_h
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