assimp/code/PretransformVertices.h

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

Copyright (c) 2006-2018, assimp team


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
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* Neither the name of the assimp team, nor the names of its
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  derived from this software without specific prior
  written permission of the assimp team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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 "BaseProcess.h"
#include <assimp/mesh.h>
#include <list>
#include <vector>

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:

    PretransformVertices ();
    ~PretransformVertices ();

public:

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

    // -------------------------------------------------------------------
    // Execute step on a given scene
    void Execute( aiScene* pScene);

    // -------------------------------------------------------------------
    // Setup import settings
    void SetupProperties(const Importer* pImp);


    // -------------------------------------------------------------------
    /** @brief Toggle the 'keep hierarchy' option
     *  @param d hm ... difficult to guess what this means, hu!?
     */
    void KeepHierarchy(bool d) {
        configKeepHierarchy = d;
    }

    // -------------------------------------------------------------------
    /** @brief Check whether 'keep hierarchy' is currently enabled.
     *  @return ...
     */
    bool IsHierarchyKept() const {
        return configKeepHierarchy;
    }

private:

    // -------------------------------------------------------------------
    // Count the number of nodes
    unsigned int CountNodes( aiNode* pcNode );

    // -------------------------------------------------------------------
    // Get a bitwise combination identifying the vertex format of a mesh
    unsigned int GetMeshVFormat(aiMesh* pcMesh);

    // -------------------------------------------------------------------
    // Count the number of vertices in the whole scene and a given
    // material index
    void CountVerticesAndFaces( aiScene* pcScene, aiNode* pcNode,
        unsigned int iMat,
        unsigned int iVFormat,
        unsigned int* piFaces,
        unsigned int* piVertices);

    // -------------------------------------------------------------------
    // Collect vertex/face data
    void CollectData( aiScene* pcScene, aiNode* pcNode,
        unsigned int iMat,
        unsigned int iVFormat,
        aiMesh* pcMeshOut,
        unsigned int aiCurrent[2],
        unsigned int* num_refs);

    // -------------------------------------------------------------------
    // Get a list of all vertex formats that occur for a given material
    // The output list contains duplicate elements
    void GetVFormatList( aiScene* pcScene, unsigned int iMat,
        std::list<unsigned int>& aiOut);

    // -------------------------------------------------------------------
    // Compute the absolute transformation matrices of each node
    void ComputeAbsoluteTransform( aiNode* pcNode );

    // -------------------------------------------------------------------
    // Simple routine to build meshes in worldspace, no further optimization
    void BuildWCSMeshes(std::vector<aiMesh*>& out, aiMesh** in,
        unsigned int numIn, aiNode* node);

    // -------------------------------------------------------------------
    // Apply the node transformation to a mesh
    void ApplyTransform(aiMesh* mesh, const aiMatrix4x4& mat);

    // -------------------------------------------------------------------
    // Reset transformation matrices to identity
    void MakeIdentityTransform(aiNode* nd);

    // -------------------------------------------------------------------
    // Build reference counters for all meshes
    void BuildMeshRefCountArray(aiNode* nd, unsigned int * refs);



    //! Configuration option: keep scene hierarchy as long as possible
    bool configKeepHierarchy;
    bool configNormalize;
    bool configTransform;
    aiMatrix4x4 configTransformation;
};

} // end of namespace Assimp

#endif // !!AI_GENFACENORMALPROCESS_H_INC