GridSinglePhasePressureSolver2.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_SINGLE_PHASE_PRESSURE_SOLVER2_HPP
#define CUBBYFLOW_SINGLE_PHASE_PRESSURE_SOLVER2_HPP

#include <Core/FDM/FDMMGLinearSystem2.hpp>
#include <Core/Solver/FDM/FDMLinearSystemSolver2.hpp>
#include <Core/Solver/FDM/FDMMGSolver2.hpp>
#include <Core/Solver/Grid/GridPressureSolver2.hpp>

namespace CubbyFlow
{
class GridSinglePhasePressureSolver2 : public GridPressureSolver2
{
 public:
    GridSinglePhasePressureSolver2();

    GridSinglePhasePressureSolver2(const GridSinglePhasePressureSolver2&) =
        delete;

    GridSinglePhasePressureSolver2(GridSinglePhasePressureSolver2&&) noexcept =
        delete;

    ~GridSinglePhasePressureSolver2() override = default;

    GridSinglePhasePressureSolver2& operator=(
        const GridSinglePhasePressureSolver2&) = delete;

    GridSinglePhasePressureSolver2& operator=(
        GridSinglePhasePressureSolver2&&) noexcept = delete;

    void Solve(
        const FaceCenteredGrid2& input, double timeIntervalInSeconds,
        FaceCenteredGrid2* output,
        const ScalarField2& boundarySDF =
            ConstantScalarField2{ std::numeric_limits<double>::max() },
        const VectorField2& boundaryVelocity = ConstantVectorField2{ { 0, 0 } },
        const ScalarField2& fluidSDF =
            ConstantScalarField2{ -std::numeric_limits<double>::max() },
        bool useCompressed = false) override;

    [[nodiscard]] GridBoundaryConditionSolver2Ptr
    SuggestedBoundaryConditionSolver() const override;

    [[nodiscard]] const FDMLinearSystemSolver2Ptr& GetLinearSystemSolver()
        const;

    void SetLinearSystemSolver(const FDMLinearSystemSolver2Ptr& solver);

    [[nodiscard]] const FDMVector2& GetPressure() const;

 private:
    void BuildMarkers(const Vector2UZ& size,
                      const std::function<Vector2D(size_t, size_t)>& pos,
                      const ScalarField2& boundarySDF,
                      const ScalarField2& fluidSDF);

    void DecompressSolution();

    virtual void BuildSystem(const FaceCenteredGrid2& input,
                             bool useCompressed);

    virtual void ApplyPressureGradient(const FaceCenteredGrid2& input,
                                       FaceCenteredGrid2* output);

    FDMLinearSystem2 m_system;
    FDMCompressedLinearSystem2 m_compSystem;
    FDMLinearSystemSolver2Ptr m_systemSolver;

    FDMMGLinearSystem2 m_mgSystem;
    FDMMGSolver2Ptr m_mgSystemSolver;

    std::vector<Array2<char>> m_markers;
};

using GridSinglePhasePressureSolver2Ptr =
    std::shared_ptr<GridSinglePhasePressureSolver2>;
}  // namespace CubbyFlow

#endif