openmw-tes3mp/components/sceneutil/riggeometry.hpp

#ifndef OPENMW_COMPONENTS_NIFOSG_RIGGEOMETRY_H
#define OPENMW_COMPONENTS_NIFOSG_RIGGEOMETRY_H

#include <osg/Geometry>
#include <osg/Matrixf>

namespace SceneUtil
{

    class Skeleton;
    class Bone;

    /// @brief Mesh skinning implementation.
    /// @note A RigGeometry may be attached directly to a Skeleton, or somewhere below a Skeleton.
    /// Note though that the RigGeometry ignores any transforms below the Skeleton, so the attachment point is not that important.
    /// @note To avoid race conditions, the rig geometry needs to be double buffered. This can be done
    /// using a FrameSwitch node that has two RigGeometry children. In the future we may want to consider implementing
    /// the double buffering inside RigGeometry.
    class RigGeometry : public osg::Geometry
    {
    public:
        RigGeometry();
        RigGeometry(const RigGeometry& copy, const osg::CopyOp& copyop);

        META_Object(SceneUtil, RigGeometry)

        struct BoneInfluence
        {
            osg::Matrixf mInvBindMatrix;
            osg::BoundingSpheref mBoundSphere;
            // <vertex index, weight>
            std::map<unsigned short, float> mWeights;
        };

        struct InfluenceMap : public osg::Referenced
        {
            std::map<std::string, BoneInfluence> mMap;
        };

        void setInfluenceMap(osg::ref_ptr<InfluenceMap> influenceMap);

        /// Initialize this geometry from the source geometry.
        /// @note The source geometry will not be modified.
        void setSourceGeometry(osg::ref_ptr<osg::Geometry> sourceGeom);

        osg::ref_ptr<osg::Geometry> getSourceGeometry();

        // Called automatically by our CullCallback
        void update(osg::NodeVisitor* nv);

        // Called automatically by our UpdateCallback
        void updateBounds(osg::NodeVisitor* nv);

    private:
        osg::ref_ptr<osg::Geometry> mSourceGeometry;
        osg::ref_ptr<osg::Vec4Array> mSourceTangents;
        Skeleton* mSkeleton;

        osg::NodePath mSkelToGeomPath;
        osg::Matrixf mGeomToSkelMatrix;

        osg::ref_ptr<InfluenceMap> mInfluenceMap;

        typedef std::pair<Bone*, osg::Matrixf> BoneBindMatrixPair;

        typedef std::pair<BoneBindMatrixPair, float> BoneWeight;

        typedef std::vector<unsigned short> VertexList;

        typedef std::map<std::vector<BoneWeight>, VertexList> Bone2VertexMap;

        Bone2VertexMap mBone2VertexMap;

        typedef std::map<Bone*, osg::BoundingSpheref> BoneSphereMap;

        BoneSphereMap mBoneSphereMap;

        unsigned int mLastFrameNumber;
        bool mBoundsFirstFrame;

        bool initFromParentSkeleton(osg::NodeVisitor* nv);

        void updateGeomToSkelMatrix(const osg::NodePath& nodePath);
    };

}

#endif