skeleton_anim.cpp

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/* ResidualVM - A 3D game interpreter
 *
 * ResidualVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the AUTHORS
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "engines/stark/model/skeleton_anim.h"

#include "engines/stark/services/archiveloader.h"

namespace Stark {

SkeletonAnim::SkeletonAnim() :
        _id(0),
        _ver(0),
        _u1(0),
        _u2(0),
        _time(0) {
}

void SkeletonAnim::createFromStream(ArchiveReadStream *stream) {
    _id = stream->readUint32LE();
    _ver = stream->readUint32LE();
    if (_ver == 3) {
        _u1 = 0;
        _time = stream->readUint32LE();
        _u2 = stream->readUint32LE();
    } else {
        _u1 = stream->readUint32LE();
        _u2 = stream->readUint32LE();
        _time = stream->readUint32LE();
    }
    if (_u2 != 0xdeadbabe) {
        error("Wrong magic while reading animation");
    }

    uint32 num = stream->readUint32LE();
    _boneAnims.resize(num);
    for (uint32 i = 0; i < num; ++i) {
        uint32 bone = stream->readUint32LE();
        uint32 numKeys = stream->readUint32LE();

        BoneAnim &boneAnim = _boneAnims[bone];
        boneAnim._keys.resize(numKeys);
        for (uint32 j = 0; j < numKeys; ++j) {
            AnimKey &key = boneAnim._keys[j];
            key._time = stream->readUint32LE();
            key._rot = stream->readQuaternion();
            key._pos = stream->readVector3();
        }
    }
}

void SkeletonAnim::getCoordForBone(uint32 time, int boneIdx, Math::Vector3d &pos, Math::Quaternion &rot) const {
    const Common::Array<AnimKey> &keys = _boneAnims[boneIdx]._keys;

    if (keys.size() == 1) {
        // There is only one key for this bone, don't bother searching which one to use
        pos = keys[0]._pos;
        rot = keys[0]._rot;

        return;
    }

    for (Common::Array<AnimKey>::const_iterator it = keys.begin(); it < keys.end(); ++it) {
        if (it->_time > time) {
            // Between two key frames, interpolate
            const AnimKey *a = it;
            --it;
            const AnimKey *b = it;

            float t = (float)(time - b->_time) / (float)(a->_time - b->_time);

            pos = b->_pos + (a->_pos - b->_pos) * t;
            rot = b->_rot.slerpQuat(a->_rot, t);

            return;
        } else if (it->_time == time || it == keys.end() - 1){
            // At a key frame
            // If not right one but didn't find any, then use last one as default
            const AnimKey *key = it;
            pos = key->_pos;
            rot = key->_rot;
            if (it == keys.end() - 1) {
                warning("Unable to find keyframe for bone '%d' at %d ms, using default", boneIdx, time);
            }
            return;
        }
    }
}

} // End of namespace Stark