/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated January 1, 2020. Replaces all prior versions.
 *
 * Copyright (c) 2013-2020, Esoteric Software LLC
 *
 * Integration of the Spine Runtimes into software or otherwise creating
 * derivative works of the Spine Runtimes is permitted under the terms and
 * conditions of Section 2 of the Spine Editor License Agreement:
 * http://esotericsoftware.com/spine-editor-license
 *
 * Otherwise, it is permitted to integrate the Spine Runtimes into software
 * or otherwise create derivative works of the Spine Runtimes (collectively,
 * "Products"), provided that each user of the Products must obtain their own
 * Spine Editor license and redistribution of the Products in any form must
 * include this license and copyright notice.
 *
 * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
 * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

#ifndef Spine_VertexAttachment_h
#define Spine_VertexAttachment_h

#include <spine/Attachment.h>

#include <spine/Vector.h>

namespace spine {
class Slot;

/// An attachment with vertices that are transformed by one or more bones and can be deformed by a slot's vertices.
class SP_API VertexAttachment : public Attachment {
    friend class SkeletonBinary;
    friend class SkeletonJson;
    friend class DeformTimeline;

    RTTI_DECL

public:
    explicit VertexAttachment(const String& name);

    virtual ~VertexAttachment();

    void computeWorldVertices(Slot& slot, float* worldVertices);
    void computeWorldVertices(Slot& slot, Vector<float>& worldVertices);

    /// Transforms local vertices to world coordinates.
    /// @param start The index of the first Vertices value to transform. Each vertex has 2 values, x and y.
    /// @param count The number of world vertex values to output. Must be less than or equal to WorldVerticesLength - start.
    /// @param worldVertices The output world vertices. Must have a length greater than or equal to offset + count.
    /// @param offset The worldVertices index to begin writing values.
    /// @param stride The number of worldVertices entries between the value pairs written.
    void computeWorldVertices(Slot& slot, size_t start, size_t count, float* worldVertices, size_t offset, size_t stride = 2);
    void computeWorldVertices(Slot& slot, size_t start, size_t count, Vector<float>& worldVertices, size_t offset, size_t stride = 2);

    /// Gets a unique ID for this attachment.
    int getId();

    Vector<size_t>& getBones();

    Vector<float>& getVertices();

    size_t getWorldVerticesLength();
    void setWorldVerticesLength(size_t inValue);

    VertexAttachment* getDeformAttachment();
    void setDeformAttachment(VertexAttachment* attachment);

    void copyTo(VertexAttachment* other);

protected:
    Vector<size_t> _bones;
    Vector<float> _vertices;
    size_t _worldVerticesLength;
    VertexAttachment* _deformAttachment;

private:
    const int _id;

    static int getNextID();
};
} // namespace spine

#endif /* Spine_VertexAttachment_h */
