PICSolver2.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_PIC_SOLVER2_HPP
#define CUBBYFLOW_PIC_SOLVER2_HPP

#include <Core/Emitter/ParticleEmitter2.hpp>
#include <Core/Particle/ParticleSystemData.hpp>
#include <Core/Solver/Grid/GridFluidSolver2.hpp>

namespace CubbyFlow
{
class PICSolver2 : public GridFluidSolver2
{
 public:
    class Builder;

    PICSolver2();

    PICSolver2(const Vector2UZ& resolution, const Vector2D& gridSpacing,
               const Vector2D& gridOrigin);

    PICSolver2(const PICSolver2&) = delete;

    PICSolver2(PICSolver2&&) noexcept = delete;

    ~PICSolver2() override = default;

    PICSolver2& operator=(const PICSolver2&) = delete;

    PICSolver2& operator=(PICSolver2&&) noexcept = delete;

    [[nodiscard]] ScalarGrid2Ptr GetSignedDistanceField() const;

    [[nodiscard]] const ParticleSystemData2Ptr& GetParticleSystemData() const;

    [[nodiscard]] const ParticleEmitter2Ptr& GetParticleEmitter() const;

    void SetParticleEmitter(const ParticleEmitter2Ptr& newEmitter);

    [[nodiscard]] static Builder GetBuilder();

 protected:
    void OnInitialize() override;

    void OnBeginAdvanceTimeStep(double timeIntervalInSeconds) override;

    void ComputeAdvection(double timeIntervalInSeconds) override;

    [[nodiscard]] ScalarField2Ptr GetFluidSDF() const override;

    virtual void TransferFromParticlesToGrids();

    virtual void TransferFromGridsToParticles();

    virtual void MoveParticles(double timeIntervalInSeconds);

    Array2<char> m_uMarkers;
    Array2<char> m_vMarkers;

 private:
    void ExtrapolateVelocityToAir();

    void BuildSignedDistanceField();

    void UpdateParticleEmitter(double timeIntervalInSeconds) const;

    size_t m_signedDistanceFieldID;
    ParticleSystemData2Ptr m_particles;
    ParticleEmitter2Ptr m_particleEmitter;
};

using PICSolver2Ptr = std::shared_ptr<PICSolver2>;

class PICSolver2::Builder final : public GridFluidSolverBuilderBase2<Builder>
{
 public:
    [[nodiscard]] PICSolver2 Build() const;

    [[nodiscard]] PICSolver2Ptr MakeShared() const;
};
}  // namespace CubbyFlow

#endif