FDMCGSolver2.h

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/*************************************************************************
> File Name: FDMCGSolver2.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: 2-D finite difference-type linear system solver using conjugate gradient.
> Created Time: 2017/08/16
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_FDM_CG_SOLVER2_H
#define CUBBYFLOW_FDM_CG_SOLVER2_H

#include <Core/Solver/FDM/FDMLinearSystemSolver2.h>

namespace CubbyFlow
{
    class FDMCGSolver2 final : public FDMLinearSystemSolver2
    {
    public:
        FDMCGSolver2(unsigned int maxNumberOfIterations, double tolerance);

        bool Solve(FDMLinearSystem2* system) override;

        bool SolveCompressed(FDMCompressedLinearSystem2* system) override;

        unsigned int GetMaxNumberOfIterations() const;

        unsigned int GetLastNumberOfIterations() const;

        double GetTolerance() const;

        double GetLastResidual() const;

    private:
        unsigned int m_maxNumberOfIterations;
        unsigned int m_lastNumberOfIterations;
        double m_tolerance;
        double m_lastResidual;

        // Uncompressed vectors
        FDMVector2 m_r;
        FDMVector2 m_d;
        FDMVector2 m_q;
        FDMVector2 m_s;

        // Compressed vectors
        VectorND m_rComp;
        VectorND m_dComp;
        VectorND m_qComp;
        VectorND m_sComp;

        void ClearUncompressedVectors();
        void ClearCompressedVectors();
    };

    using FDMCGSolver2Ptr = std::shared_ptr<FDMCGSolver2>;
}

#endif