/*
Open Asset Import Library (assimp)
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  following disclaimer.

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* Neither the name of the assimp team, nor the names of its
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/

/** @file Defines a post processing step to reorder faces for
 better cache locality*/
#ifndef AI_IMPROVECACHELOCALITY_H_INC
#define AI_IMPROVECACHELOCALITY_H_INC

#include "Common/BaseProcess.h"

#include <assimp/types.h>

struct aiMesh;

namespace Assimp {

// ---------------------------------------------------------------------------
/** The ImproveCacheLocalityProcess reorders all faces for improved vertex
 *  cache locality. It tries to arrange all faces to fans and to render
 *  faces which share vertices directly one after the other.
 *
 *  @note This step expects triagulated input data.
 */
class ImproveCacheLocalityProcess : public BaseProcess {
public:
    // -------------------------------------------------------------------
    /// The default class constructor / destructor.
    ImproveCacheLocalityProcess();
    ~ImproveCacheLocalityProcess() override = default;

    // -------------------------------------------------------------------
    // Check whether the pp step is active
    bool IsActive( unsigned int pFlags) const override;

    // -------------------------------------------------------------------
    // Executes the pp step on a given scene
    void Execute( aiScene* pScene) override;

    // -------------------------------------------------------------------
    // Configures the pp step
    void SetupProperties(const Importer* pImp) override;

protected:
    // -------------------------------------------------------------------
    /** Executes the postprocessing step on the given mesh
     * @param pMesh The mesh to process.
     * @param meshNum Index of the mesh to process
     */
    ai_real ProcessMesh( aiMesh* pMesh, unsigned int meshNum);

private:
    //! Configuration parameter: specifies the size of the cache to
    //! optimize the vertex data for.
    unsigned int mConfigCacheDepth;
};

} // end of namespace Assimp

#endif // AI_IMPROVECACHELOCALITY_H_INC
