openmw/components/nif/physics.hpp

#ifndef OPENMW_COMPONENTS_NIF_PHYSICS_HPP
#define OPENMW_COMPONENTS_NIF_PHYSICS_HPP

#include "record.hpp"
#include "recordptr.hpp"

#include <osg/Quat>
#include <osg/Vec3f>
#include <osg/Vec4f>

#include <cstdint>
#include <vector>

// This header contains certain record definitions
// specific to Bethesda implementation of Havok physics
namespace Nif
{

    class NIFStream;
    class Reader;

    /// Non-record data types

    struct bhkWorldObjCInfoProperty
    {
        unsigned int mData;
        unsigned int mSize;
        unsigned int mCapacityAndFlags;
        void read(NIFStream* nif);
    };

    enum class BroadPhaseType : uint8_t
    {
        BroadPhase_Invalid = 0,
        BroadPhase_Entity = 1,
        BroadPhase_Phantom = 2,
        BroadPhase_Border = 3
    };

    struct bhkWorldObjectCInfo
    {
        BroadPhaseType mPhaseType;
        bhkWorldObjCInfoProperty mProperty;
        void read(NIFStream* nif);
    };

    struct HavokMaterial
    {
        unsigned int mMaterial;
        void read(NIFStream* nif);
    };

    struct HavokFilter
    {
        unsigned char mLayer;
        unsigned char mFlags;
        unsigned short mGroup;
        void read(NIFStream* nif);
    };

    struct hkSubPartData
    {
        HavokMaterial mHavokMaterial;
        unsigned int mNumVertices;
        HavokFilter mHavokFilter;
        void read(NIFStream* nif);
    };

    enum class hkResponseType : uint8_t
    {
        Response_Invalid = 0,
        Response_SimpleContact = 1,
        Response_Reporting = 2,
        Response_None = 3
    };

    struct bhkEntityCInfo
    {
        hkResponseType mResponseType;
        unsigned short mProcessContactDelay;
        void read(NIFStream* nif);
    };

    struct hkpMoppCode
    {
        osg::Vec4f mOffset;
        std::vector<char> mData;
        void read(NIFStream* nif);
    };

    struct TriangleData
    {
        unsigned short mTriangle[3];
        unsigned short mWeldingInfo;
        osg::Vec3f mNormal;
        void read(NIFStream* nif);
    };

    enum class hkMotionType : uint8_t
    {
        Motion_Invalid = 0,
        Motion_Dynamic = 1,
        Motion_SphereInertia = 2,
        Motion_SphereStabilized = 3,
        Motion_BoxInertia = 4,
        Motion_BoxStabilized = 5,
        Motion_Keyframed = 6,
        Motion_Fixed = 7,
        Motion_ThinBox = 8,
        Motion_Character = 9
    };

    enum class hkDeactivatorType : uint8_t
    {
        Deactivator_Invalid = 0,
        Deactivator_Never = 1,
        Deactivator_Spatial = 2
    };

    enum class hkSolverDeactivation : uint8_t
    {
        SolverDeactivation_Invalid = 0,
        SolverDeactivation_Off = 1,
        SolverDeactivation_Low = 2,
        SolverDeactivation_Medium = 3,
        SolverDeactivation_High = 4,
        SolverDeactivation_Max = 5
    };

    enum class hkQualityType : uint8_t
    {
        Quality_Invalid = 0,
        Quality_Fixed = 1,
        Quality_Keyframed = 2,
        Quality_Debris = 3,
        Quality_Moving = 4,
        Quality_Critical = 5,
        Quality_Bullet = 6,
        Quality_User = 7,
        Quality_Character = 8,
        Quality_KeyframedReport = 9
    };

    struct bhkRigidBodyCInfo
    {
        HavokFilter mHavokFilter;
        hkResponseType mResponseType;
        unsigned short mProcessContactDelay;
        osg::Vec4f mTranslation;
        osg::Quat mRotation;
        osg::Vec4f mLinearVelocity;
        osg::Vec4f mAngularVelocity;
        float mInertiaTensor[3][4];
        osg::Vec4f mCenter;
        float mMass;
        float mLinearDamping;
        float mAngularDamping;
        float mTimeFactor{ 1.f };
        float mGravityFactor{ 1.f };
        float mFriction;
        float mRollingFrictionMult;
        float mRestitution;
        float mMaxLinearVelocity;
        float mMaxAngularVelocity;
        float mPenetrationDepth;
        hkMotionType mMotionType;
        hkDeactivatorType mDeactivatorType;
        bool mEnableDeactivation{ true };
        hkSolverDeactivation mSolverDeactivation;
        hkQualityType mQualityType;
        unsigned char mAutoRemoveLevel;
        unsigned char mResponseModifierFlags;
        unsigned char mNumContactPointShapeKeys;
        bool mForceCollidedOntoPPU;
        void read(NIFStream* nif);
    };

    /// Record types

    // Abstract Bethesda Havok object
    struct bhkRefObject : public Record
    {
    };

    // Abstract serializable Bethesda Havok object
    struct bhkSerializable : public bhkRefObject
    {
    };

    // Abstract narrowphase collision detection object
    struct bhkShape : public bhkSerializable
    {
    };

    // Abstract bhkShape collection
    struct bhkShapeCollection : public bhkShape
    {
    };

    // Generic collision object
    struct NiCollisionObject : public Record
    {
        // The node that references this object
        NodePtr mTarget;

        void read(NIFStream* nif) override { mTarget.read(nif); }
        void post(Reader& nif) override { mTarget.post(nif); }
    };

    // Bethesda Havok-specific collision object
    struct bhkCollisionObject : public NiCollisionObject
    {
        unsigned short mFlags;
        bhkWorldObjectPtr mBody;

        void read(NIFStream* nif) override;
        void post(Reader& nif) override
        {
            NiCollisionObject::post(nif);
            mBody.post(nif);
        }
    };

    // Abstract Havok shape info record
    struct bhkWorldObject : public bhkSerializable
    {
        bhkShapePtr mShape;
        HavokFilter mHavokFilter;
        bhkWorldObjectCInfo mWorldObjectInfo;
        void read(NIFStream* nif) override;
        void post(Reader& nif) override;
    };

    // Abstract
    struct bhkEntity : public bhkWorldObject
    {
        bhkEntityCInfo mInfo;
        void read(NIFStream* nif) override;
    };

    // Bethesda extension of hkpBvTreeShape
    // hkpBvTreeShape adds a bounding volume tree to an hkpShapeCollection
    struct bhkBvTreeShape : public bhkShape
    {
        bhkShapePtr mShape;
        void read(NIFStream* nif) override;
        void post(Reader& nif) override;
    };

    // bhkBvTreeShape with Havok MOPP code
    struct bhkMoppBvTreeShape : public bhkBvTreeShape
    {
        float mScale;
        hkpMoppCode mMopp;
        void read(NIFStream* nif) override;
    };

    // Bethesda triangle strip-based Havok shape collection
    struct bhkNiTriStripsShape : public bhkShape
    {
        HavokMaterial mHavokMaterial;
        float mRadius;
        unsigned int mGrowBy;
        osg::Vec4f mScale{ 1.f, 1.f, 1.f, 0.f };
        NiTriStripsDataList mData;
        std::vector<unsigned int> mFilters;
        void read(NIFStream* nif) override;
        void post(Reader& nif) override;
    };

    // Bethesda packed triangle strip-based Havok shape collection
    struct bhkPackedNiTriStripsShape : public bhkShapeCollection
    {
        std::vector<hkSubPartData> mSubshapes;
        unsigned int mUserData;
        float mRadius;
        osg::Vec4f mScale;
        hkPackedNiTriStripsDataPtr mData;

        void read(NIFStream* nif) override;
        void post(Reader& nif) override;
    };

    // bhkPackedNiTriStripsShape data block
    struct hkPackedNiTriStripsData : public bhkShapeCollection
    {
        std::vector<TriangleData> mTriangles;
        std::vector<osg::Vec3f> mVertices;
        std::vector<hkSubPartData> mSubshapes;
        void read(NIFStream* nif) override;
    };

    // Abstract
    struct bhkSphereRepShape : public bhkShape
    {
        HavokMaterial mHavokMaterial;
        void read(NIFStream* nif) override;
    };

    // Abstract
    struct bhkConvexShape : public bhkSphereRepShape
    {
        float mRadius;
        void read(NIFStream* nif) override;
    };

    // A convex shape built from vertices
    struct bhkConvexVerticesShape : public bhkConvexShape
    {
        bhkWorldObjCInfoProperty mVerticesProperty;
        bhkWorldObjCInfoProperty mNormalsProperty;
        std::vector<osg::Vec4f> mVertices;
        std::vector<osg::Vec4f> mNormals;
        void read(NIFStream* nif) override;
    };

    struct bhkConvexTransformShape : public bhkShape
    {
        bhkShapePtr mShape;
        HavokMaterial mHavokMaterial;
        float mRadius;
        osg::Matrixf mTransform;
        void read(NIFStream* nif) override;
        void post(Reader& nif) override;
    };

    // A box
    struct bhkBoxShape : public bhkConvexShape
    {
        osg::Vec3f mExtents;
        void read(NIFStream* nif) override;
    };

    // A capsule
    struct bhkCapsuleShape : public bhkConvexShape
    {
        osg::Vec3f mPoint1, mPoint2;
        float mRadius1, mRadius2;

        void read(NIFStream* nif) override;
    };

    // A sphere
    using bhkSphereShape = bhkConvexShape;

    // A list of shapes
    struct bhkListShape : public bhkShapeCollection
    {
        bhkShapeList mSubshapes;
        HavokMaterial mHavokMaterial;
        bhkWorldObjCInfoProperty mChildShapeProperty;
        bhkWorldObjCInfoProperty mChildFilterProperty;
        std::vector<HavokFilter> mHavokFilters;
        void read(NIFStream* nif) override;
    };

    struct bhkRigidBody : public bhkEntity
    {
        bhkRigidBodyCInfo mInfo;
        bhkSerializableList mConstraints;
        unsigned int mBodyFlags;

        void read(NIFStream* nif) override;
    };

} // Namespace
#endif