/*

Open Asset Import Library (assimp)

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  following disclaimer.

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*/

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

#ifndef AI_DEBONEPROCESS_H_INC

#define AI_DEBONEPROCESS_H_INC

#include "Common/BaseProcess.h"

#include <assimp/mesh.h>

#include <assimp/scene.h>

#include <vector>

#include <utility>

#// Forward declarations

class DeboneTest;

namespace Assimp {

#if (!defined AI_DEBONE_THRESHOLD)

#   define AI_DEBONE_THRESHOLD  1.0f

#endif // !! AI_DEBONE_THRESHOLD

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

/** This post processing step removes bones nearly losslessly or according to

* a configured threshold. In order to remove the bone, the primitives affected by

* the bone are split from the mesh. The split off (new) mesh is boneless. At any

* point in time, bones without affect upon a given mesh are to be removed.

*/

class DeboneProcess final : public BaseProcess {

public:

    DeboneProcess();

    ~DeboneProcess() 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;

protected:

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

    /** 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;

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

    /** Counts bones total/removable in a given mesh.

    * @param pMesh The mesh to process.

    */

    bool ConsiderMesh( const aiMesh* pMesh);

    /// Splits the given mesh by bone count.

    /// @param pMesh the Mesh to split. Is not changed at all, but might be superfluous in case it was split.

    /// @param poNewMeshes Array of submeshes created in the process. Empty if splitting was not necessary.

    void SplitMesh(const aiMesh* pMesh, std::vector< std::pair< aiMesh*,const aiBone* > >& poNewMeshes) const;

    /// Recursively updates the node's mesh list to account for the changed mesh list

    void UpdateNode(aiNode* pNode) const;

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

    // Apply transformation to a mesh

    void ApplyTransform(aiMesh* mesh, const aiMatrix4x4& mat)const;

public:

    /** Number of bones present in the scene. */

    unsigned int mNumBones;

    unsigned int mNumBonesCanDoWithout;

    float mThreshold;

    bool mAllOrNone;

    /// Per mesh index: Array of indices of the new submeshes.

    std::vector< std::vector< std::pair< unsigned int,aiNode* > > > mSubMeshIndices;

};

} // end of namespace Assimp

#endif // AI_DEBONEPROCESS_H_INC