openmw/components/nif/node.hpp

#ifndef OPENMW_COMPONENTS_NIF_NODE_HPP
#define OPENMW_COMPONENTS_NIF_NODE_HPP

#include "controlled.hpp"
#include "extra.hpp"
#include "data.hpp"
#include "property.hpp"
#include "niftypes.hpp"
#include "controller.hpp"
#include "base.hpp"

#include <components/misc/stringops.hpp>

namespace Nif
{

struct NiNode;

/** A Node is an object that's part of the main NIF tree. It has
    parent node (unless it's the root), and transformation (location
    and rotation) relative to it's parent.
 */
class Node : public Named
{
public:
    // Node flags. Interpretation depends somewhat on the type of node.
    unsigned int flags;
    Transformation trafo;
    osg::Vec3f velocity; // Unused? Might be a run-time game state
    PropertyList props;

    // Bounding box info
    bool hasBounds;
    osg::Vec3f boundPos;
    Matrix3 boundRot;
    osg::Vec3f boundXYZ; // Box size

    void read(NIFStream *nif)
    {
        Named::read(nif);

        flags = nif->getUShort();
        trafo = nif->getTrafo();
        velocity = nif->getVector3();
        props.read(nif);

        hasBounds = nif->getBoolean();
        if(hasBounds)
        {
            nif->getInt(); // always 1
            boundPos = nif->getVector3();
            boundRot = nif->getMatrix3();
            boundXYZ = nif->getVector3();
        }

        parent = nullptr;

        isBone = false;
    }

    void post(NIFFile *nif)
    {
        Named::post(nif);
        props.post(nif);
    }

    // Parent node, or nullptr for the root node. As far as I'm aware, only
    // NiNodes (or types derived from NiNodes) can be parents.
    NiNode *parent;

    bool isBone;

    void setBone()
    {
        isBone = true;
    }
};

struct NiNode : Node
{
    NodeList children;
    NodeList effects;

    enum Flags {
        Flag_Hidden = 0x0001,
        Flag_MeshCollision = 0x0002,
        Flag_BBoxCollision = 0x0004,
        Flag_ActiveCollision = 0x0020
    };
    enum BSAnimFlags {
        AnimFlag_AutoPlay = 0x0020
    };
    enum BSParticleFlags {
        ParticleFlag_AutoPlay = 0x0020,
        ParticleFlag_LocalSpace = 0x0080
    };
    enum ControllerFlags {
        ControllerFlag_Active = 0x8
    };

    void read(NIFStream *nif)
    {
        Node::read(nif);
        children.read(nif);
        effects.read(nif);

        // Discard transformations for the root node, otherwise some meshes
        // occasionally get wrong orientation. Only for NiNode-s for now, but
        // can be expanded if needed.
        if (0 == recIndex && !Misc::StringUtils::ciEqual(name, "bip01"))
        {
            static_cast<Nif::Node*>(this)->trafo = Nif::Transformation::getIdentity();
        }
    }

    void post(NIFFile *nif)
    {
        Node::post(nif);
        children.post(nif);
        effects.post(nif);

        for(size_t i = 0;i < children.length();i++)
        {
            // Why would a unique list of children contain empty refs?
            if(!children[i].empty())
                children[i]->parent = this;
        }
    }
};

struct NiTriShape : Node
{
    /* Possible flags:
        0x40 - mesh has no vertex normals ?

        Only flags included in 0x47 (ie. 0x01, 0x02, 0x04 and 0x40) have
        been observed so far.
    */

    NiTriShapeDataPtr data;
    NiSkinInstancePtr skin;

    void read(NIFStream *nif)
    {
        Node::read(nif);
        data.read(nif);
        skin.read(nif);
    }

    void post(NIFFile *nif)
    {
        Node::post(nif);
        data.post(nif);
        skin.post(nif);
        if (!skin.empty())
            nif->setUseSkinning(true);
    }
};

struct NiTriStrips : Node
{
    NiTriStripsDataPtr data;
    NiSkinInstancePtr skin;

    void read(NIFStream *nif)
    {
        Node::read(nif);
        data.read(nif);
        skin.read(nif);
    }

    void post(NIFFile *nif)
    {
        Node::post(nif);
        data.post(nif);
        skin.post(nif);
        if (!skin.empty())
            nif->setUseSkinning(true);
    }
};


struct NiCamera : Node
{
    struct Camera
    {
        // Camera frustrum
        float left, right, top, bottom, nearDist, farDist;

        // Viewport
        float vleft, vright, vtop, vbottom;

        // Level of detail modifier
        float LOD;

        void read(NIFStream *nif)
        {
            left = nif->getFloat();
            right = nif->getFloat();
            top = nif->getFloat();
            bottom = nif->getFloat();
            nearDist = nif->getFloat();
            farDist = nif->getFloat();

            vleft = nif->getFloat();
            vright = nif->getFloat();
            vtop = nif->getFloat();
            vbottom = nif->getFloat();

            LOD = nif->getFloat();
        }
    };
    Camera cam;

    void read(NIFStream *nif)
    {
        Node::read(nif);

        cam.read(nif);

        nif->getInt(); // -1
        nif->getInt(); // 0
    }
};

struct NiAutoNormalParticles : Node
{
    NiAutoNormalParticlesDataPtr data;

    void read(NIFStream *nif)
    {
        Node::read(nif);
        data.read(nif);
        nif->getInt(); // -1
    }

    void post(NIFFile *nif)
    {
        Node::post(nif);
        data.post(nif);
    }
};

struct NiRotatingParticles : Node
{
    NiRotatingParticlesDataPtr data;

    void read(NIFStream *nif)
    {
        Node::read(nif);
        data.read(nif);
        nif->getInt(); // -1
    }

    void post(NIFFile *nif)
    {
        Node::post(nif);
        data.post(nif);
    }
};

// A node used as the base to switch between child nodes, such as for LOD levels.
struct NiSwitchNode : public NiNode
{
    unsigned int initialIndex;

    void read(NIFStream *nif)
    {
        NiNode::read(nif);
        initialIndex = nif->getUInt();
    }
};

struct NiLODNode : public NiSwitchNode
{
    osg::Vec3f lodCenter;

    struct LODRange
    {
        float minRange;
        float maxRange;
    };
    std::vector<LODRange> lodLevels;

    void read(NIFStream *nif)
    {
        NiSwitchNode::read(nif);
        if (nif->getVersion() >= NIFFile::NIFVersion::VER_MW && nif->getVersion() <= NIFFile::NIFVersion::VER_ZT2)
            lodCenter = nif->getVector3();
        unsigned int numLodLevels = nif->getUInt();
        for (unsigned int i=0; i<numLodLevels; ++i)
        {
            LODRange r;
            r.minRange = nif->getFloat();
            r.maxRange = nif->getFloat();
            lodLevels.push_back(r);
        }
    }
};

} // Namespace
#endif