/*

Open Asset Import Library (assimp)

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  copyright notice, this list of conditions and the

  following disclaimer.

* Redistributions in binary form must reproduce the above

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*/

/** Defines a post processing step to limit the number of bones affecting a single vertex. */

#ifndef AI_LIMITBONEWEIGHTSPROCESS_H_INC

#define AI_LIMITBONEWEIGHTSPROCESS_H_INC

#include "Common/BaseProcess.h"

// Forward declarations

struct aiMesh;

class LimitBoneWeightsTest;

namespace Assimp {

// NOTE: If you change these limits, don't forget to change the

// corresponding values in all Assimp ports

// **********************************************************

// Java: ConfigProperty.java,

//  ConfigProperty.DEFAULT_BONE_WEIGHT_LIMIT

// **********************************************************

#if (!defined AI_LMW_MAX_WEIGHTS)

#   define AI_LMW_MAX_WEIGHTS   0x4

#endif // !! AI_LMW_MAX_WEIGHTS

// ---------------------------------------------------------------------------

/** This post processing step limits the number of bones affecting a vertex

* to a certain maximum value. If a vertex is affected by more than that number

* of bones, the bone weight with the least influence on this vertex are removed.

* The other weights on this bone are then renormalized to assure the sum weight

* to be 1.

*/

class ASSIMP_API LimitBoneWeightsProcess : public BaseProcess {

public:

    // -------------------------------------------------------------------

    /// The default class constructor / destructor.

    LimitBoneWeightsProcess();

    ~LimitBoneWeightsProcess() override = default;

    // -------------------------------------------------------------------

    /** Returns whether the processing step is present in the given flag.

    * @param pFlags The processing flags the importer was called with.

    *   A bitwise combination of #aiPostProcessSteps.

    * @return true if the process is present in this flag fields,

    *   false if not.

    */

    bool IsActive( unsigned int pFlags) const override;

    // -------------------------------------------------------------------

    /** Called prior to ExecuteOnScene().

    * The function is a request to the process to update its configuration

    * basing on the Importer's configuration property list.

    */

    void SetupProperties(const Importer* pImp) override;

    // -------------------------------------------------------------------

    /** Executes the post processing step on the given imported data.

    * At the moment a process is not supposed to fail.

    * @param pScene The imported data to work at.

    */

    void Execute( aiScene* pScene) override;

    // -------------------------------------------------------------------

    /** Limits the bone weight count for all vertices in the given mesh.

    * @param pMesh The mesh to process.

    */

    void ProcessMesh( aiMesh* pMesh);

    // -------------------------------------------------------------------

    /** Describes a bone weight on a vertex */

    struct Weight {

        unsigned int mBone; ///< Index of the bone

        float mWeight;      ///< Weight of that bone on this vertex

        Weight() AI_NO_EXCEPT

        : mBone(0)

        , mWeight(0.0f) {

            // empty

        }

        Weight( unsigned int pBone, float pWeight)

        : mBone(pBone)

        , mWeight(pWeight) {

            // empty

        }

        /** Comparison operator to sort bone weights by descending weight */

        bool operator < (const Weight& pWeight) const {

            return mWeight > pWeight.mWeight;

        }

    };

    /** Maximum number of bones influencing any single vertex. */

    unsigned int mMaxWeights;

    bool mRemoveEmptyBones;

};

} // end of namespace Assimp

#endif // AI_LIMITBONEWEIGHTSPROCESS_H_INC