AmoebaCudaKernels.h

#ifndef AMOEBA_OPENMM_CUDAKERNELS_H_
#define AMOEBA_OPENMM_CUDAKERNELS_H_

/* -------------------------------------------------------------------------- *
 *                              OpenMMAmoeba                                  *
 * -------------------------------------------------------------------------- *
 * This is part of the OpenMM molecular simulation toolkit originating from   *
 * Simbios, the NIH National Center for Physics-Based Simulation of           *
 * Biological Structures at Stanford, funded under the NIH Roadmap for        *
 * Medical Research, grant U54 GM072970. See https://simtk.org.               *
 *                                                                            *
 * Portions copyright (c) 2008 Stanford University and the Authors.           *
 * Authors:                                                                   *
 * Contributors:                                                              *
 *                                                                            *
 * This program is free software: you can redistribute it and/or modify       *
 * it under the terms of the GNU Lesser General Public License as published   *
 * by the Free Software Foundation, either version 3 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 Lesser General Public License for more details.                        *
 *                                                                            *
 * You should have received a copy of the GNU Lesser General Public License   *
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.      *
 * -------------------------------------------------------------------------- */

#include "openmm/amoebaKernels.h"
#include "CudaKernels.h"
#include "openmm/kernels.h"
#include "openmm/System.h"
#include "AmoebaCudaData.h"

namespace OpenMM {

/**
 * This kernel is invoked at the beginning and end of force and energy computations.  It gives the
 * Platform a chance to clear buffers and do other initialization at the beginning, and to do any
 * necessary work at the end to determine the final results.
 */
class CalcAmoebaForcesAndEnergyKernel : public CalcForcesAndEnergyKernel {
public:
    CalcAmoebaForcesAndEnergyKernel(std::string name, const Platform& platform, AmoebaCudaData& data) : CalcForcesAndEnergyKernel(name, platform), data(data) {
        cudaCalcForcesAndEnergyKernel = new CudaCalcForcesAndEnergyKernel( name, platform, data.cudaPlatformData );
    }   
    ~CalcAmoebaForcesAndEnergyKernel() {
        delete cudaCalcForcesAndEnergyKernel;
    }   
    /*** 
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     */
    void initialize(const System& system);

    /** 
     * This is called at the beginning of each force/energy computation, before calcForcesAndEnergy() has been called on
     * any ForceImpl.
     *
     * @param context       the context in which to execute this kernel
     * @param includeForce  true if forces should be computed
     * @param includeEnergy true if potential energy should be computed
     */
    void beginComputation(ContextImpl& context, bool includeForce, bool includeEnergy);

    /** 
     * This is called at the end of each force/energy computation, after calcForcesAndEnergy() has been called on
     * every ForceImpl.
     *
     * @param context       the context in which to execute this kernel
     * @param includeForce  true if forces should be computed
     * @param includeEnergy true if potential energy should be computed
     * @return the potential energy of the system.  This value is added to all values returned by ForceImpls'
     * calcForcesAndEnergy() methods.  That is, each force kernel may <i>either</i> return its contribution to the
     * energy directly, <i>or</i> add it to an internal buffer so that it will be included here.
     */
    double finishComputation(ContextImpl& context, bool includeForce, bool includeEnergy);

private:
    AmoebaCudaData& data;
    CudaCalcForcesAndEnergyKernel* cudaCalcForcesAndEnergyKernel;
};

/**
 * This kernel is invoked by AmoebaHarmonicBondForce to calculate the forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaHarmonicBondForceKernel : public CalcAmoebaHarmonicBondForceKernel {
public:
    CudaCalcAmoebaHarmonicBondForceKernel(std::string name, 
                                          const Platform& platform,
                                          AmoebaCudaData& data,
                                          System& system);
    ~CudaCalcAmoebaHarmonicBondForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaHarmonicBondForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaHarmonicBondForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    int numBonds;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked by AmoebaUreyBradleyForce to calculate the forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaUreyBradleyForceKernel : public CalcAmoebaUreyBradleyForceKernel {
public:
    CudaCalcAmoebaUreyBradleyForceKernel(std::string name, 
                                         const Platform& platform,
                                         AmoebaCudaData& data,
                                         System& system);
    ~CudaCalcAmoebaUreyBradleyForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaUreyBradleyForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaUreyBradleyForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    int numInteractions;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked by AmoebaHarmonicAngleForce to calculate the forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaHarmonicAngleForceKernel : public CalcAmoebaHarmonicAngleForceKernel {
public:
    CudaCalcAmoebaHarmonicAngleForceKernel(std::string name, const Platform& platform, AmoebaCudaData& data, System& system);
    ~CudaCalcAmoebaHarmonicAngleForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaHarmonicAngleForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaHarmonicAngleForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    int numAngles;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked by AmoebaHarmonicInPlaneAngleForce to calculate the forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaHarmonicInPlaneAngleForceKernel : public CalcAmoebaHarmonicInPlaneAngleForceKernel {
public:
    CudaCalcAmoebaHarmonicInPlaneAngleForceKernel(std::string name, const Platform& platform, AmoebaCudaData& data, System& system);
    ~CudaCalcAmoebaHarmonicInPlaneAngleForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaHarmonicInPlaneAngleForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaHarmonicInPlaneAngleForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    int numAngles;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked by AmoebaTorsionForce to calculate the forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaTorsionForceKernel : public CalcAmoebaTorsionForceKernel {
public:
    CudaCalcAmoebaTorsionForceKernel(std::string name, const Platform& platform, AmoebaCudaData& data, System& system);
    ~CudaCalcAmoebaTorsionForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaTorsionForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaTorsionForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    int numTorsions;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked by AmoebaPiTorsionForce to calculate the forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaPiTorsionForceKernel : public CalcAmoebaPiTorsionForceKernel {
public:
    CudaCalcAmoebaPiTorsionForceKernel(std::string name, const Platform& platform, AmoebaCudaData& data, System& system);
    ~CudaCalcAmoebaPiTorsionForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaPiTorsionForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaPiTorsionForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    int numPiTorsions;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked by AmoebaStretchBendForce to calculate the forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaStretchBendForceKernel : public CalcAmoebaStretchBendForceKernel {
public:
    CudaCalcAmoebaStretchBendForceKernel(std::string name, const Platform& platform, AmoebaCudaData& data, System& system);
    ~CudaCalcAmoebaStretchBendForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaStretchBendForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaStretchBendForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    int numStretchBends;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked by AmoebaOutOfPlaneBendForce to calculate the forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaOutOfPlaneBendForceKernel : public CalcAmoebaOutOfPlaneBendForceKernel {
public:
    CudaCalcAmoebaOutOfPlaneBendForceKernel(std::string name, const Platform& platform, AmoebaCudaData& data, System& system);
    ~CudaCalcAmoebaOutOfPlaneBendForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaOutOfPlaneBendForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaOutOfPlaneBendForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    int numOutOfPlaneBends;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked by AmoebaTorsionTorsionForce to calculate the forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaTorsionTorsionForceKernel : public CalcAmoebaTorsionTorsionForceKernel {
public:
    CudaCalcAmoebaTorsionTorsionForceKernel(std::string name, const Platform& platform, AmoebaCudaData& data, System& system);
    ~CudaCalcAmoebaTorsionTorsionForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaTorsionTorsionForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaTorsionTorsionForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    int numTorsionTorsions;
    int numTorsionTorsionGrids;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked by AmoebaMultipoleForce to calculate the forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaMultipoleForceKernel : public CalcAmoebaMultipoleForceKernel {
public:
    CudaCalcAmoebaMultipoleForceKernel(std::string name, const Platform& platform, AmoebaCudaData& data, System& system);
    ~CudaCalcAmoebaMultipoleForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaMultipoleForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaMultipoleForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    int numMultipoles;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked by AmoebaMultipoleForce to calculate the forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaGeneralizedKirkwoodForceKernel : public CalcAmoebaGeneralizedKirkwoodForceKernel {
public:
    CudaCalcAmoebaGeneralizedKirkwoodForceKernel(std::string name, const Platform& platform, AmoebaCudaData& data, System& system);
    ~CudaCalcAmoebaGeneralizedKirkwoodForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaMultipoleForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaGeneralizedKirkwoodForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked to calculate the vdw forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaVdwForceKernel : public CalcAmoebaVdwForceKernel {
public:
    CudaCalcAmoebaVdwForceKernel(std::string name, const Platform& platform, AmoebaCudaData& data, System& system);
    ~CudaCalcAmoebaVdwForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaMultipoleForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaVdwForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    AmoebaCudaData& data;
    System& system;
};

/**
 * This kernel is invoked to calculate the WCA dispersion forces acting on the system and the energy of the system.
 */
class CudaCalcAmoebaWcaDispersionForceKernel : public CalcAmoebaWcaDispersionForceKernel {
public:
    CudaCalcAmoebaWcaDispersionForceKernel(std::string name, const Platform& platform, AmoebaCudaData& data, System& system);
    ~CudaCalcAmoebaWcaDispersionForceKernel();
    /**
     * Initialize the kernel.
     * 
     * @param system     the System this kernel will be applied to
     * @param force      the AmoebaMultipoleForce this kernel will be used for
     */
    void initialize(const System& system, const AmoebaWcaDispersionForce& force);
    /**
     * Execute the kernel to calculate the forces and/or energy.
     *
     * @param context        the context in which to execute this kernel
     * @param includeForces  true if forces should be calculated
     * @param includeEnergy  true if the energy should be calculated
     * @return the potential energy due to the force
     */
    double execute(ContextImpl& context, bool includeForces, bool includeEnergy);
private:
    class ForceInfo;
    AmoebaCudaData& data;
    System& system;
};

} // namespace OpenMM

#endif /*AMOEBA_OPENMM_CUDAKERNELS_H*/