India/cocos2d-x/cocos/3d/CCMeshSkin.h

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 Copyright (c) 2014-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#ifndef __CCMESHSKIN_H__
#define __CCMESHSKIN_H__

#include "3d/CCBundle3DData.h"
#include "base/CCRef.h"
#include "base/CCVector.h"
#include "math/CCMath.h"


NS_CC_BEGIN

/**
 * @addtogroup _3d
 * @{
 */

class Bone3D;
class Skeleton3D;

/**
 * @brief MeshSkin, A class maintain a collection of bones that affect Mesh vertex.
 * And it is responsible for computing matrix palettes that used by skin mesh rendering.
 * @js NA
 * @lua NA
 */
class CC_DLL MeshSkin: public Ref
{
    friend class Mesh;
public:
    
    /**create a new meshskin if do not want to share meshskin*/
    static MeshSkin* create(Skeleton3D* skeleton, const std::string& filename, const std::string& name);
    
    static MeshSkin* create(Skeleton3D* skeleton, const std::vector<std::string>& boneNames, const std::vector<Mat4>& invBindPose);
    
    /**get total bone count, skin bone + node bone*/
    ssize_t getBoneCount() const;
    
    /**get bone*/
    Bone3D* getBoneByIndex(unsigned int index) const;
    Bone3D* getBoneByName(const std::string& id) const;
    
    /**get bone index*/
    int getBoneIndex(Bone3D* bone) const;
    
    /**compute matrix palette used by gpu skin*/
    Vec4* getMatrixPalette();
    
    /**getSkinBoneCount() * 3*/
    ssize_t getMatrixPaletteSize() const;
    
    /**get root bone of the skin*/
    Bone3D* getRootBone() const;
    
CC_CONSTRUCTOR_ACCESS:
    
    MeshSkin();
    
    ~MeshSkin();
    
    /**remove all bones*/
    void removeAllBones();
    
    /**add skin bone*/
    void addSkinBone(Bone3D* bone);
    
    /** get inverse bind pose */
    const Mat4& getInvBindPose(const Bone3D* bone);
    
protected:
    
    Vector<Bone3D*>    _skinBones; // bones with skin
    std::vector<Mat4>  _invBindPoses; //inverse bind pose of bone

    Bone3D* _rootBone;
    Skeleton3D*     _skeleton; //skeleton the skin referred
    
    // Pointer to the array of palette matrices.
    // This array is passed to the vertex shader as a uniform.
    // Each 4x3 row-wise matrix is represented as 3 Vec4's.
    // The number of Vec4's is (_skinBones.size() * 3).
    Vec4* _matrixPalette;
};

// end of 3d group
/// @}

NS_CC_END

#endif // __CCSKIN_H__