PointHashGridSearcher.hpp

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// This code is based on Jet framework.
// Copyright (c) 2018 Doyub Kim
// CubbyFlow is voxel-based fluid simulation engine for computer games.
// Copyright (c) 2020 CubbyFlow Team
// Core Part: Chris Ohk, Junwoo Hwang, Jihong Sin, Seungwoo Yoo
// AI Part: Dongheon Cho, Minseo Kim
// We are making my contributions/submissions to this project solely in our
// personal capacity and are not conveying any rights to any intellectual
// property of any third parties.
 
#ifndef CUBBYFLOW_POINT_HASH_GRID_SEARCHER_HPP
#define CUBBYFLOW_POINT_HASH_GRID_SEARCHER_HPP
 
#include <Core/Array/Array.hpp>
#include <Core/Matrix/Matrix.hpp>
#include <Core/Searcher/PointNeighborSearcher.hpp>
 
namespace CubbyFlow
{
template <size_t N>
class PointHashGridSearcher final : public PointNeighborSearcher<N>
{
 public:
    CUBBYFLOW_NEIGHBOR_SEARCHER_TYPE_NAME(PointHashGridSearcher, N)
 
    class Builder;
 
    using typename PointNeighborSearcher<N>::ForEachNearbyPointFunc;
    using PointNeighborSearcher<N>::Build;
 
    PointHashGridSearcher(const Vector<size_t, N>& resolution,
                          double gridSpacing);
 
    ~PointHashGridSearcher() override = default;
 
    PointHashGridSearcher(const PointHashGridSearcher& other);
 
    PointHashGridSearcher(PointHashGridSearcher&& other) noexcept;
 
    PointHashGridSearcher& operator=(const PointHashGridSearcher& other);
 
    PointHashGridSearcher& operator=(PointHashGridSearcher&& other) noexcept;
 
    void Build(const ConstArrayView1<Vector<double, N>>& points,
               double maxSearchRadius) override;
 
    void ForEachNearbyPoint(
        const Vector<double, N>& origin, double radius,
        const ForEachNearbyPointFunc& callback) const override;
 
    [[nodiscard]] bool HasNearbyPoint(const Vector<double, N>& origin,
                                      double radius) const override;
 
    void Add(const Vector<double, N>& point);
 
    [[nodiscard]] const Array1<Array1<size_t>>& Buckets() const;
 
    [[nodiscard]] std::shared_ptr<PointNeighborSearcher<N>> Clone()
        const override;
 
    void Set(const PointHashGridSearcher& other);
 
    void Serialize(std::vector<uint8_t>* buffer) const override;
 
    void Deserialize(const std::vector<uint8_t>& buffer) override;
 
    static Builder GetBuilder();
 
 private:
    template <size_t M = N>
    static std::enable_if_t<M == 2, void> Serialize(
        const PointHashGridSearcher<2>& searcher, std::vector<uint8_t>* buffer);
 
    template <size_t M = N>
    static std::enable_if_t<M == 3, void> Serialize(
        const PointHashGridSearcher<3>& searcher, std::vector<uint8_t>* buffer);
 
    template <size_t M = N>
    static std::enable_if_t<M == 2, void> Deserialize(
        const std::vector<uint8_t>& buffer, PointHashGridSearcher<2>& searcher);
 
    template <size_t M = N>
    static std::enable_if_t<M == 3, void> Deserialize(
        const std::vector<uint8_t>& buffer, PointHashGridSearcher<3>& searcher);
 
    double m_gridSpacing = 1.0;
    Vector<ssize_t, N> m_resolution = Vector<ssize_t, N>::MakeConstant(1);
    Array1<Vector<double, N>> m_points;
    Array1<Array1<size_t>> m_buckets;
};
 
using PointHashGridSearcher2 = PointHashGridSearcher<2>;
 
using PointHashGridSearcher3 = PointHashGridSearcher<3>;
 
using PointHashGridSearcher2Ptr = std::shared_ptr<PointHashGridSearcher2>;
 
using PointHashGridSearcher3Ptr = std::shared_ptr<PointHashGridSearcher3>;
 
template <size_t N>
class PointHashGridSearcher<N>::Builder final
    : public PointNeighborSearcherBuilder<N>
{
 public:
    Builder() = default;
 
    ~Builder() override = default;
 
    Builder(const Builder& other) = delete;
 
    Builder(Builder&& other) noexcept = delete;
 
    Builder& operator=(const Builder& other) = delete;
 
    Builder& operator=(Builder&& other) noexcept = delete;
 
    Builder& WithResolution(const Vector<size_t, N>& resolution);
 
    Builder& WithGridSpacing(double gridSpacing);
 
    PointHashGridSearcher<N> Build() const;
 
    std::shared_ptr<PointHashGridSearcher<N>> MakeShared() const;
 
    std::shared_ptr<PointNeighborSearcher<N>> BuildPointNeighborSearcher()
        const override;
 
 private:
    Vector<size_t, N> m_resolution = Vector<size_t, N>::MakeConstant(64);
    double m_gridSpacing = 1.0;
};
}  // namespace CubbyFlow
 
#endif