/*

-----------------------------------------------------------------------------

This source file is part of OGRE

    (Object-oriented Graphics Rendering Engine)

For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2014 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

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*/

#ifndef __KeyFrame_H__

#define __KeyFrame_H__

#include "OgrePrerequisites.h"

#include "OgreVector.h"

#include "OgreQuaternion.h"

#include "OgreAny.h"

#include "OgreHardwareVertexBuffer.h"

#include "OgreHeaderPrefix.h"

namespace Ogre 

{

    /** \addtogroup Core

    *  @{

    */

    /** \addtogroup Animation

    *  @{

    */

    /** A key frame in an animation sequence defined by an AnimationTrack.

        This class can be used as a basis for all kinds of key frames. 

        The unifying principle is that multiple KeyFrames define an 

        animation sequence, with the exact state of the animation being an 

        interpolation between these key frames. 

    */

    class _OgreExport KeyFrame : public AnimationAlloc

    {

    public:

        /** Default constructor, you should not call this but use AnimationTrack::createKeyFrame instead. */

        KeyFrame(const AnimationTrack* parent, Real time);

        virtual ~KeyFrame() {}

        /** Gets the time of this keyframe in the animation sequence. */

        Real getTime(void) const { return mTime; }

        /** Clone a keyframe (internal use only) */

        virtual KeyFrame* _clone(AnimationTrack* newParent) const OGRE_NODISCARD;

    protected:

        Real mTime;

        const AnimationTrack* mParentTrack;

    };

    /** Specialised KeyFrame which stores any numeric value.

    */

    class _OgreExport NumericKeyFrame : public KeyFrame

    {

    public:

        /** Default constructor, you should not call this but use AnimationTrack::createKeyFrame instead. */

        NumericKeyFrame(const AnimationTrack* parent, Real time);

        ~NumericKeyFrame() {}

        /** Get the value at this keyframe. */

        const Any& getValue(void) const { return mValue; }

        /** Set the value at this keyframe.

            All keyframe values must have a consistent type. 

        */

        void setValue(const Any& val) { mValue = val; }

        /** Clone a keyframe (internal use only) */

        KeyFrame* _clone(AnimationTrack* newParent) const override;

    private:

        Any mValue;

    };

    /** Specialised KeyFrame which stores a full transform. */

    class _OgreExport TransformKeyFrame : public KeyFrame

    {

    public:

        /** Default constructor, you should not call this but use AnimationTrack::createKeyFrame instead. */

        TransformKeyFrame(const AnimationTrack* parent, Real time);

        ~TransformKeyFrame() {}

        /** Sets the translation associated with this keyframe. 

        The translation factor affects how much the keyframe translates (moves) it's animable

        object at it's time index.

        @param trans The vector to translate by

        */

        virtual void setTranslate(const Vector3& trans);

        /** Gets the translation applied by this keyframe. */

        const Vector3& getTranslate(void) const;

        /** Sets the scaling factor applied by this keyframe to the animable

        object at it's time index.

        @param scale The vector to scale by (beware of supplying zero values for any component of this

        vector, it will scale the object to zero dimensions)

        */

        virtual void setScale(const Vector3& scale);

        /** Gets the scaling factor applied by this keyframe. */

        virtual const Vector3& getScale(void) const;

        /** Sets the rotation applied by this keyframe.

        @param rot The rotation applied; use Quaternion methods to convert from angle/axis or Matrix3 if

        you don't like using Quaternions directly.

        */

        virtual void setRotation(const Quaternion& rot);

        /** Gets the rotation applied by this keyframe. */

        virtual const Quaternion& getRotation(void) const;

        /** Clone a keyframe (internal use only) */

        KeyFrame* _clone(AnimationTrack* newParent) const override;

    private:

        Vector3 mTranslate;

        Vector3 mScale;

        Quaternion mRotate;

    };

    /** Specialised KeyFrame which stores absolute vertex positions for a complete

        buffer, designed to be interpolated with other keys in the same track. 

    */

    class _OgreExport VertexMorphKeyFrame : public KeyFrame

    {

    public:

        /** Default constructor, you should not call this but use AnimationTrack::createKeyFrame instead. */

        VertexMorphKeyFrame(const AnimationTrack* parent, Real time);

        ~VertexMorphKeyFrame() {}

        /** Sets the vertex buffer containing the source positions for this keyframe. 

            We assume that positions are the first 3 float elements in this buffer,

            although we don't necessarily assume they're the only ones in there.

        @param buf Vertex buffer link; will not be modified so can be shared

            read-only data

        */

        void setVertexBuffer(const HardwareVertexBufferSharedPtr& buf);

        /** Gets the vertex buffer containing positions for this keyframe. */

        const HardwareVertexBufferSharedPtr& getVertexBuffer(void) const;

        KeyFrame* _clone(AnimationTrack* newParent) const override;

    private:

        HardwareVertexBufferSharedPtr mBuffer;

    };

    /** Specialised KeyFrame which references a Mesh::Pose at a certain influence

        level, which stores offsets for a subset of the vertices 

        in a buffer to provide a blendable pose.

    */

    class _OgreExport VertexPoseKeyFrame : public KeyFrame

    {

    public:

        /** Default constructor, you should not call this but use AnimationTrack::createKeyFrame instead. */

        VertexPoseKeyFrame(const AnimationTrack* parent, Real time);

        ~VertexPoseKeyFrame() {}

        /** Reference to a pose at a given influence level 

            Each keyframe can refer to many poses each at a given influence level.

        **/

        struct PoseRef

        {

            /** The linked pose index.

                The Mesh contains all poses for all vertex data in one list, both 

                for the shared vertex data and the dedicated vertex data on submeshes.

                The 'target' on the parent track must match the 'target' on the 

                linked pose.

            */

            ushort poseIndex;

            /** Influence level of the linked pose. 

                1.0 for full influence (full offset), 0.0 for no influence.

            */

            float influence;

            PoseRef(ushort p, float i) : poseIndex(p), influence(i) {}

        };

        typedef std::vector<PoseRef> PoseRefList;

        /** Add a new pose reference. 

        @see PoseRef

        */

        void addPoseReference(ushort poseIndex, float influence);

        /** Update the influence of a pose reference. 

        @see PoseRef

        */

        void updatePoseReference(ushort poseIndex, float influence);

        /** Remove reference to a given pose. 

        @param poseIndex The pose index (not the index of the reference)

        */

        void removePoseReference(ushort poseIndex);

        /** Remove all pose references. */

        void removeAllPoseReferences(void);

        /** Get a const reference to the list of pose references. */

        const PoseRefList& getPoseReferences(void) const;

        typedef VectorIterator<PoseRefList> PoseRefIterator;

        typedef ConstVectorIterator<PoseRefList> ConstPoseRefIterator;

        /** Get an iterator over the pose references.

        @deprecated use getPoseReferences() */

        OGRE_DEPRECATED PoseRefIterator getPoseReferenceIterator(void);

        /** Get a const iterator over the pose references.

        @deprecated use getPoseReferences() */

        OGRE_DEPRECATED ConstPoseRefIterator getPoseReferenceIterator(void) const;

        /** Clone a keyframe (internal use only) */

        KeyFrame* _clone(AnimationTrack* newParent) const override;

        void _applyBaseKeyFrame(const VertexPoseKeyFrame* base);

    private:

        PoseRefList mPoseRefs;

    };

    /** @} */

    /** @} */

}

#include "OgreHeaderSuffix.h"

#endif