fieldArrayD.h

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/*  This file is part of the OpenLB library
 *
 *  Copyright (C) 2020 Adrian Kummerlaender
 *  E-mail contact: info@openlb.net
 *  The most recent release of OpenLB can be downloaded at
 *  <http://www.openlb.net/>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public
 *  License along with this program; if not, write to the Free
 *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA  02110-1301, USA.
*/
 
#ifndef FIELD_ARRAY_D_H
#define FIELD_ARRAY_D_H
 
#include "meta.h"
#include "vector.h"
#include "columnVector.h"
#include "serializer.h"
#include "dynamics/descriptorBase.h"
 
#include "platform/platform.h"
 
#include <memory>
#include <tuple>
 
namespace olb {
 
 
template<typename T, typename DESCRIPTOR, typename FIELD>
using FieldD = Vector<
  typename FIELD::template value_type<T>,
  DESCRIPTOR::template size<FIELD>()
>;
 
template<typename T, typename DESCRIPTOR, typename FIELD>
class AbstractFieldArrayD {
private:
  virtual const typename FIELD::template column_type<T>& getAbstractColumn(unsigned iDim) const = 0;
  virtual       typename FIELD::template column_type<T>& getAbstractColumn(unsigned iDim)       = 0;
 
public:
  class const_ptr;
  class ptr;
 
  const auto& operator[](unsigned iDim) const
  {
    return getAbstractColumn(iDim);
  }
 
  auto& operator[](unsigned iDim)
  {
    return getAbstractColumn(iDim);
  }
 
  auto get(std::size_t i) const
  {
    if constexpr (DESCRIPTOR::template size<FIELD>() == 1) {
      return operator[](0)[i];
    } else {
      return Vector<typename FIELD::template value_type<T>,
                    DESCRIPTOR::template size<FIELD>()>([this,i](unsigned iD) {
        return operator[](iD)[i];
      });
    }
  }
 
  void set(std::size_t i, const FieldD<T,DESCRIPTOR,FIELD>& data)
  {
    for (unsigned iD=0; iD < DESCRIPTOR::template size<FIELD>(); ++iD) {
      operator[](iD)[i] = data[iD];
    }
  }
 
  const_ptr getPointer(std::size_t i) const
  {
    return const_ptr(*this, i);
  }
 
  ptr getPointer(std::size_t i)
  {
    return ptr(*this, i);
  }
 
  virtual void resize(std::size_t newCount) = 0;
 
  virtual void setProcessingContext(ProcessingContext context) = 0;
 
};
 
template<typename T, typename DESCRIPTOR, typename FIELD>
class AbstractFieldArrayD<T,DESCRIPTOR,FIELD>::const_ptr
  : public ScalarVector<const typename FIELD::template value_type<T>,
                        DESCRIPTOR::template size<FIELD>(),
                        const_ptr> {
private:
  const AbstractFieldArrayD<T,DESCRIPTOR,FIELD>& _data;
  std::size_t _index;
 
  friend typename ScalarVector<const typename FIELD::template value_type<T>,
                               DESCRIPTOR::template size<FIELD>(),
                               const_ptr>::type;
 
protected:
  const typename FIELD::template value_type<T>* getComponentPointer(unsigned iDim) const
  {
    return &_data[iDim][_index];
  }
 
public:
  const_ptr(const AbstractFieldArrayD<T,DESCRIPTOR,FIELD>& data, std::size_t index):
    _data(data),
    _index(index) { }
 
  const_ptr(const_ptr&& rhs):
    _data(rhs._data),
    _index(rhs._index) { }
 
  std::size_t getIndex() const
  {
    return _index;
  }
 
  void setIndex(std::size_t index)
  {
    _index = index;
  }
 
};
 
template<typename T, typename DESCRIPTOR, typename FIELD>
class AbstractFieldArrayD<T,DESCRIPTOR,FIELD>::ptr
  : public ScalarVector<typename FIELD::template value_type<T>,
                        DESCRIPTOR::template size<FIELD>(),
                        ptr> {
private:
  AbstractFieldArrayD<T,DESCRIPTOR,FIELD>& _data;
  std::size_t _index;
 
  friend typename ScalarVector<typename FIELD::template value_type<T>,
                               DESCRIPTOR::template size<FIELD>(),
                               ptr>::type;
 
protected:
  const typename FIELD::template value_type<T>* getComponentPointer(unsigned iDim) const
  {
    return &_data[iDim][_index];
  }
 
  typename FIELD::template value_type<T>* getComponentPointer(unsigned iDim)
  {
    return &_data[iDim][_index];
  }
 
public:
  ptr(AbstractFieldArrayD<T,DESCRIPTOR,FIELD>& data, std::size_t index):
    _data(data),
    _index(index) { }
 
  ptr(ptr&& rhs):
    _data(rhs._data),
    _index(rhs._index) { }
 
  template <typename U, typename IMPL>
  ptr& operator=(const GenericVector<U,DESCRIPTOR::template size<FIELD>(),IMPL>& rhs)
  {
    for (unsigned iD=0; iD < DESCRIPTOR::template size<FIELD>(); ++iD) {
      this->operator[](iD) = rhs[iD];
    }
    return *this;
  }
 
  std::size_t getIndex() const
  {
    return _index;
  }
 
  void setIndex(std::size_t index)
  {
    _index = index;
  }
 
};
 
 
template<typename T, typename DESCRIPTOR, Platform PLATFORM, typename FIELD>
class FieldArrayD final : public ColumnVector<typename ImplementationOf<typename FIELD::template column_type<T>,PLATFORM>::type,
                                              DESCRIPTOR::template size<FIELD>()>
                        , public AbstractFieldArrayD<T,DESCRIPTOR,FIELD>
{
private:
  const typename FIELD::template column_type<T>& getAbstractColumn(unsigned iDim) const override
  {
    return this->operator[](iDim);
  }
 
  typename FIELD::template column_type<T>& getAbstractColumn(unsigned iDim) override
  {
    return this->operator[](iDim);
  }
 
public:
  using field_t = FIELD;
  using value_type = typename FIELD::template value_type<T>;
  using column_type = typename ImplementationOf<typename FIELD::template column_type<T>,PLATFORM>::type;
 
  using ColumnVector<column_type,DESCRIPTOR::template size<FIELD>()>::operator[];
 
  FieldArrayD(std::size_t count):
    ColumnVector<column_type,
                 DESCRIPTOR::template size<FIELD>()>(count)
  {
    const auto initial = FIELD::template getInitialValue<T,DESCRIPTOR>();
    for (std::size_t i=0; i < count; ++i) {
      this->getRowPointer(i) = initial;
    }
  }
 
  const AbstractFieldArrayD<T,DESCRIPTOR,FIELD>& asAbstract() const
  {
    return static_cast<const AbstractFieldArrayD<T,DESCRIPTOR,FIELD>&>(*this);
  }
 
  AbstractFieldArrayD<T,DESCRIPTOR,FIELD>& asAbstract()
  {
    return static_cast<AbstractFieldArrayD<T,DESCRIPTOR,FIELD>&>(*this);
  }
 
  void setProcessingContext(ProcessingContext context) override
  {
    for (unsigned iDim=0; iDim < DESCRIPTOR::template size<FIELD>(); ++iDim) {
      this->operator[](iDim).setProcessingContext(context);
    }
  }
 
  void resize(std::size_t newCount) override {
    const std::size_t oldCount = this->_count;
    static_cast<ColumnVector<
      column_type,
      DESCRIPTOR::template size<FIELD>()
    >*>(this)->resize(newCount);
    if (oldCount < newCount) {
      const auto initial = FIELD::template getInitialValue<T,DESCRIPTOR>();
      for (std::size_t i=oldCount; i < newCount; ++i) {
        this->getRowPointer(i) = initial;
      }
    }
  }
 
  auto getField(std::size_t iCell) const
  {
    return this->getRow(iCell);
  }
 
  void setField(std::size_t iCell, const FieldD<T,DESCRIPTOR,FIELD>& v)
  {
    this->setRow(iCell, v);
  }
 
  auto getFieldPointer(std::size_t iCell) const
  {
    return this->getRowPointer(iCell);
  }
  auto getFieldPointer(std::size_t iCell)
  {
    return this->getRowPointer(iCell);
  }
 
};
 
template <typename T, typename DESCRIPTOR, typename FIELD>
struct ConcretizableFieldArrayD {
 
using base_t = ColumnVectorBase;
 
template <Platform PLATFORM>
using type = FieldArrayD<T,DESCRIPTOR,PLATFORM,FIELD>;
 
};
 
 
template <typename T, typename DESCRIPTOR, Platform PLATFORM, typename FIELD>
class ConcreteCommunicatable<FieldArrayD<T,DESCRIPTOR,PLATFORM,FIELD>> final : public Communicatable {
private:
  FieldArrayD<T,DESCRIPTOR,PLATFORM,FIELD>& _communicatee;
 
public:
  ConcreteCommunicatable(FieldArrayD<T,DESCRIPTOR,PLATFORM,FIELD>& communicatee):
    _communicatee{communicatee} { }
 
  std::size_t size(ConstSpan<CellID> indices) const override
  {
    return (ConcreteCommunicatable<
      ColumnVector<typename ImplementationOf<typename FIELD::template column_type<T>,PLATFORM>::type,
                 DESCRIPTOR::template size<FIELD>()>
    >(_communicatee).size(indices));
  }
 
  std::size_t serialize(ConstSpan<CellID> indices,
                        std::uint8_t* buffer) const override
  {
    std::uint8_t* curr = buffer;
    curr += ConcreteCommunicatable<
      ColumnVector<typename ImplementationOf<typename FIELD::template column_type<T>,PLATFORM>::type,
                   DESCRIPTOR::template size<FIELD>()>
    >(_communicatee).serialize(indices, curr);
    return curr - buffer;
  }
 
  std::size_t deserialize(ConstSpan<CellID> indices,
                          const std::uint8_t* buffer) override
  {
    const std::uint8_t* curr = buffer;
    curr += ConcreteCommunicatable<
      ColumnVector<typename ImplementationOf<typename FIELD::template column_type<T>,PLATFORM>::type,
                   DESCRIPTOR::template size<FIELD>()>
    >(_communicatee).deserialize(indices, curr);
    return curr - buffer;
  }
};
 
 
template<typename T, typename DESCRIPTOR, Platform PLATFORM, typename... FIELDS>
class MultiFieldArrayD : public Serializable {
private:
  std::size_t _count;
  std::tuple<FieldArrayD<T,DESCRIPTOR,PLATFORM,FIELDS>...> _static;
 
public:
  using fields_t = meta::list<FIELDS...>;
 
  MultiFieldArrayD(std::size_t count=1):
    _count(count),
    // Trickery to construct each member of _static with `count`.
    // Uses the comma operator in conjunction with type dropping.
    _static((std::void_t<FIELDS>(), count)...)
  { }
 
  template <typename FIELD>
  const FieldArrayD<T,DESCRIPTOR,PLATFORM,FIELD>& get(meta::id<FIELD> field = meta::id<FIELD>()) const
  {
    static_assert(meta::contains<FIELD,FIELDS...>(), "FIELD not contained in FIELDS");
    return std::get<(fields_t::template index<FIELD>())>(_static);
  }
 
  template <typename FIELD>
  FieldArrayD<T,DESCRIPTOR,PLATFORM,FIELD>& get(meta::id<FIELD> field = meta::id<FIELD>())
  {
    static_assert(meta::contains<FIELD,FIELDS...>(), "FIELD not contained in FIELDS");
    return std::get<(fields_t::template index<FIELD>())>(_static);
  }
 
  template <typename FIELD>
  auto getField(std::size_t iCell) const
  {
    return get<FIELD>().getRow(iCell);
  }
 
  template <typename FIELD>
  void setField(std::size_t iCell, const FieldD<T,DESCRIPTOR,FIELD>& v)
  {
    get<FIELD>().setRow(iCell, v);
  }
 
  template <typename FIELD>
  const typename FIELD::template value_type<T>& getFieldComponent(std::size_t iCell, unsigned iDim) const;
  template <typename FIELD>
  typename FIELD::template value_type<T>& getFieldComponent(std::size_t iCell, unsigned iDim);
 
  template <typename FIELD>
  auto getFieldPointer(std::size_t iCell) const
  {
    return get<FIELD>().getRowPointer(iCell);
  }
  template <typename FIELD>
  auto getFieldPointer(std::size_t iCell)
  {
    return get<FIELD>().getRowPointer(iCell);
  }
 
  template <typename F>
  void forFields(F f) const;
  template <typename F>
  void forFields(F f);
  template <typename F>
  void forFieldsAt(std::size_t idx, F f);
 
 
  void resize(std::size_t newCount)
  {
    forFields([newCount](auto& fieldArray) {
      fieldArray.resize(newCount);
    });
    _count = newCount;
  }
 
  void swap(std::size_t i, std::size_t j)
  {
    forFields([i,j](auto& fieldArray) {
      fieldArray.swap(i,j);
    });
  }
 
  void setProcessingContext(ProcessingContext context) {
    forFields([context](auto& fieldArray) {
      fieldArray.setProcessingContext(context);
    });
  }
 
  std::size_t getNblock() const override;
  std::size_t getSerializableSize() const override;
  bool* getBlock(std::size_t iBlock, std::size_t& sizeBlock, bool loadingMode) override;
 
};
 
//template <typename T, typename DESCRIPTOR, Platform PLATFORM, typename FIELD>
//ConcreteCommunicatable(FieldArrayD<T,DESCRIPTOR,PLATFORM,FIELD>&) -> ConcreteCommunicatable<
//  ColumnVector<typename ImplementationOf<typename FIELD::template column_type<T>,PLATFORM>::type,
//               DESCRIPTOR::template size<FIELD>()>
//>;
 
 
template <typename T, typename DESCRIPTOR, Platform PLATFORM, typename... FIELDS>
class ConcreteCommunicatable<MultiFieldArrayD<T,DESCRIPTOR,PLATFORM,FIELDS...>> final : public Communicatable {
private:
  MultiFieldArrayD<T,DESCRIPTOR,PLATFORM,FIELDS...>& _communicatee;
 
public:
  ConcreteCommunicatable(MultiFieldArrayD<T,DESCRIPTOR,PLATFORM,FIELDS...>& communicatee):
    _communicatee{communicatee} { }
 
  std::size_t size(ConstSpan<CellID> indices) const override
  {
    return (ConcreteCommunicatable<
      ColumnVector<typename ImplementationOf<typename FIELDS::template column_type<T>,PLATFORM>::type,
                 DESCRIPTOR::template size<FIELDS>()>
    >(_communicatee.template get<FIELDS>()).size(indices) + ... + 0);
  }
 
  std::size_t serialize(ConstSpan<CellID> indices,
                        std::uint8_t* buffer) const override
  {
    std::uint8_t* curr = buffer;
    meta::list<FIELDS...>::for_each([&](auto field) {
      using FIELD = typename decltype(field)::type;
      curr += ConcreteCommunicatable<
        ColumnVector<typename ImplementationOf<typename FIELD::template column_type<T>,PLATFORM>::type,
                     DESCRIPTOR::template size<FIELD>()>
      >(_communicatee.template get(field)).serialize(indices, curr);
    });
    return curr - buffer;
  }
 
  std::size_t deserialize(ConstSpan<CellID> indices,
                          const std::uint8_t* buffer) override
  {
    const std::uint8_t* curr = buffer;
    meta::list<FIELDS...>::for_each([&](auto field) {
      using FIELD = typename decltype(field)::type;
      curr += ConcreteCommunicatable<
        ColumnVector<typename ImplementationOf<typename FIELD::template column_type<T>,PLATFORM>::type,
                     DESCRIPTOR::template size<FIELD>()>
      >(_communicatee.template get(field)).deserialize(indices, curr);
    });
    return curr - buffer;
  }
};
 
 
template <typename T, typename GROUPS>
class DynamicFieldGroupsD;
template <typename T, typename... GROUPS>
class DynamicFieldGroupsD<T, meta::list<GROUPS...>> {
private:
  template <typename GROUP>
  struct GroupedFieldArrayD {
    template <typename... FIELDS>
    using curried = MultiFieldArrayD<T,GROUP,Platform::CPU_SISD,FIELDS...>;
    using type = typename GROUP::template decompose_into<curried>;
  };
 
  std::tuple<typename GroupedFieldArrayD<GROUPS>::type...> _data;
 
  std::size_t _count;
 
public:
  DynamicFieldGroupsD(std::size_t count):
    _data((std::void_t<GROUPS>(), count)...), _count(count) { }
 
  template <typename GROUP>
  auto& get() {
    if constexpr (meta::contains<GROUP,GROUPS...>()) {
      return std::get<descriptors::getIndexInFieldList<GROUP,GROUPS...>()>(_data);
    } else {
      throw std::invalid_argument("This DynamicFieldGroupsD does not provide GROUP.");
    }
  }
 
  std::size_t count(){ return _count; }
 
  void resize(std::size_t newCount) {
    (get<GROUPS>().resize(newCount), ...);
    _count = newCount;
  }
 
  void swap(std::size_t i, std::size_t j)
  {
    (get<GROUPS>().swap(i,j), ...);
  }
 
  std::size_t constexpr getSerializableSize()
  {
    return (get<GROUPS>().getSerializableSize() + ... + 0);
  }
 
};
 
 
 
 
//Communicatable for GroupedFieldArrays
template<typename DATA, typename... GROUPS>
class GroupedDataCommunicatable{
private:
  DATA& _data;
 
public:
  GroupedDataCommunicatable( DATA& data )
    : _data(data) {}
 
  std::size_t size(ConstSpan<CellID> indices) const
  {
    std::size_t size = 0;
    meta::list<GROUPS...>::for_each([&](auto group) {
      using GROUP = typename decltype(group)::type;
      // Workaround for Clang argument deduction bug
      auto communicatable = ConcreteCommunicatable(_data.template get<GROUP>());
      size += communicatable.size(indices);
    });
    return size;
  }
 
  std::size_t serialize(ConstSpan<CellID> indices, std::uint8_t* buffer) const
  {
    std::uint8_t* curr = buffer;
    meta::list<GROUPS...>::for_each([&](auto group) {
      using GROUP = typename decltype(group)::type;
      // Workaround for Clang argument deduction bug
      auto communicatable = ConcreteCommunicatable(_data.template get<GROUP>());
      curr += communicatable.serialize(indices, curr);
    });
    return curr - buffer;
  }
 
  std::size_t deserialize(ConstSpan<CellID> indices, const std::uint8_t* buffer)
  {
    const std::uint8_t* curr = buffer;
    meta::list<GROUPS...>::for_each([&](auto group) {
      using GROUP = typename decltype(group)::type;
      // Workaround for Clang argument deduction bug
      auto communicatable = ConcreteCommunicatable(_data.template get<GROUP>());
      curr += communicatable.deserialize(indices, curr);
    });
    return curr - buffer;
  }
};
 
template <typename DATA, typename DESCRIPTOR>
struct GroupedDataCommunicatableHelper {
  template<typename... GROUPS>
  using CurriedFieldGroupsCommunicatable = GroupedDataCommunicatable<DATA,GROUPS...>;
 
  using type = typename DESCRIPTOR::template decompose_into<CurriedFieldGroupsCommunicatable>;
};
 
template <typename T, typename DESCRIPTOR, Platform PLATFORM>
struct MultiFieldArrayForDescriptorHelper {
  template<typename... FIELDS>
  using CurriedMultiFieldArrayD = MultiFieldArrayD<T,DESCRIPTOR,PLATFORM,FIELDS...>;
 
  using type = typename DESCRIPTOR::fields_t::template decompose_into<CurriedMultiFieldArrayD>;
};
 
template <typename T, typename DESCRIPTOR, Platform PLATFORM=Platform::CPU_SISD>
using MultiFieldArrayForDescriptorD = typename MultiFieldArrayForDescriptorHelper<T,DESCRIPTOR,PLATFORM>::type;
 
 
}
 
#endif