/*

Open Asset Import Library (assimp)

----------------------------------------------------------------------

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All rights reserved.

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  copyright notice, this list of conditions and the

  following disclaimer.

* Redistributions in binary form must reproduce the above

  copyright notice, this list of conditions and the

  following disclaimer in the documentation and/or other

  materials provided with the distribution.

* Neither the name of the assimp team, nor the names of its

  contributors may be used to endorse or promote products

  derived from this software without specific prior

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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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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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*/

/** @file PretransformVertices.h

 *  @brief Defines a post processing step to pretransform all

 *    vertices in the scenegraph

 */

#ifndef AI_PRETRANSFORMVERTICES_H_INC

#define AI_PRETRANSFORMVERTICES_H_INC

#include "Common/BaseProcess.h"

#include <assimp/mesh.h>

#include <list>

#include <vector>

// Forward declarations

struct aiNode;

class PretransformVerticesTest;

namespace Assimp {

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

/** The PretransformVertices pre-transforms all vertices in the node tree

 *  and removes the whole graph. The output is a list of meshes, one for

 *  each material.

*/

class ASSIMP_API PretransformVertices : public BaseProcess {

public:

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

    /// The default class constructor / destructor.

  PretransformVertices();

  ~PretransformVertices() override = default;

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

  // Check whether step is active

  bool IsActive(unsigned int pFlags) const override;

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

  // Execute step on a given scene

  void Execute(aiScene *pScene) override;

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

  // Setup import settings

  void SetupProperties(const Importer *pImp) override;

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

  /** @brief Toggle the 'keep hierarchy' option

     *  @param keep    true for keep configuration.

     */

  void KeepHierarchy(bool keep) {

    mConfigKeepHierarchy = keep;

  }

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

  /** @brief Check whether 'keep hierarchy' is currently enabled.

     *  @return ...

     */

  bool IsHierarchyKept() const {

    return mConfigKeepHierarchy;

  }

private:

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

  // Count the number of nodes

  unsigned int CountNodes(const aiNode *pcNode) const;

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

  // Get a bitwise combination identifying the vertex format of a mesh

  //unsigned int GetMeshVFormat(aiMesh *pcMesh) const;

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

  // Count the number of vertices in the whole scene and a given

  // material index

  void CountVerticesAndFaces(const aiScene *pcScene, const aiNode *pcNode,

      unsigned int iMat,

      unsigned int iVFormat,

      unsigned int *piFaces,

      unsigned int *piVertices) const;

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

  // Collect vertex/face data

  void CollectData(const aiScene *pcScene, const aiNode *pcNode,

      unsigned int iMat,

      unsigned int iVFormat,

      aiMesh *pcMeshOut,

      unsigned int aiCurrent[2],

      unsigned int *num_refs) const;

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

  // Get a list of all vertex formats that occur for a given material

  // The output list contains duplicate elements

  /*void GetVFormatList(const aiScene *pcScene, unsigned int iMat,

      std::list<unsigned int> &aiOut) const;*/

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

  // Compute the absolute transformation matrices of each node

  void ComputeAbsoluteTransform(aiNode *pcNode);

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

  // Simple routine to build meshes in worldspace, no further optimization

  void BuildWCSMeshes(MeshArray &out, aiMesh **in,

      unsigned int numIn, aiNode *node) const;

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

  // Apply the node transformation to a mesh

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

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

  // Reset transformation matrices to identity

  void MakeIdentityTransform(aiNode *nd) const;

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

  // Build reference counters for all meshes

  void BuildMeshRefCountArray(const aiNode *nd, unsigned int *refs) const;

  //! Configuration option: keep scene hierarchy as long as possible

  bool mConfigKeepHierarchy;

  bool mConfigNormalize;

  bool mConfigTransform;

  aiMatrix4x4 mConfigTransformation;

  bool mConfigPointCloud;

};

} // end of namespace Assimp

#endif // !!AI_GENFACENORMALPROCESS_H_INC