assimp/code/Importer.h

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

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All rights reserved.

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  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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  written permission of the assimp team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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*/

/** @file Importer.h mostly internal stuff for use by #Assimp::Importer */
#ifndef INCLUDED_AI_IMPORTER_H
#define INCLUDED_AI_IMPORTER_H

#include <map>
#include <string>
#include <vector>
#include <assimp/matrix4x4.h>

struct aiScene;

namespace Assimp    {
    class ProgressHandler;
    class IOSystem;
    class BaseImporter;
    class BaseProcess;
    class SharedPostProcessInfo;


//! @cond never
// ---------------------------------------------------------------------------
/** @brief Internal PIMPL implementation for Assimp::Importer
 *
 *  Using this idiom here allows us to drop the dependency from
 *  std::vector and std::map in the public headers. Furthermore we are dropping
 *  any STL interface problems caused by mismatching STL settings. All
 *  size calculation are now done by us, not the app heap. */
class ImporterPimpl
{
public:

    // Data type to store the key hash
    typedef unsigned int KeyType;

    // typedefs for our four configuration maps.
    // We don't need more, so there is no need for a generic solution
    typedef std::map<KeyType, int> IntPropertyMap;
    typedef std::map<KeyType, float> FloatPropertyMap;
    typedef std::map<KeyType, std::string> StringPropertyMap;
    typedef std::map<KeyType, aiMatrix4x4> MatrixPropertyMap;

public:

    /** IO handler to use for all file accesses. */
    IOSystem* mIOHandler;
    bool mIsDefaultHandler;

    /** Progress handler for feedback. */
    ProgressHandler* mProgressHandler;
    bool mIsDefaultProgressHandler;

    /** Format-specific importer worker objects - one for each format we can read.*/
    std::vector< BaseImporter* > mImporter;

    /** Post processing steps we can apply at the imported data. */
    std::vector< BaseProcess* > mPostProcessingSteps;

    /** The imported data, if ReadFile() was successful, NULL otherwise. */
    aiScene* mScene;

    /** The error description, if there was one. */
    std::string mErrorString;

    /** List of integer properties */
    IntPropertyMap mIntProperties;

    /** List of floating-point properties */
    FloatPropertyMap mFloatProperties;

    /** List of string properties */
    StringPropertyMap mStringProperties;

    /** List of Matrix properties */
    MatrixPropertyMap mMatrixProperties;

    /** Used for testing - extra verbose mode causes the ValidateDataStructure-Step
     *  to be executed before and after every single postprocess step */
    bool bExtraVerbose;

    /** Used by post-process steps to share data */
    SharedPostProcessInfo* mPPShared;
};
//! @endcond


struct BatchData;

// ---------------------------------------------------------------------------
/** FOR IMPORTER PLUGINS ONLY: A helper class to the pleasure of importers
 *  that need to load many external meshes recursively.
 *
 *  The class uses several threads to load these meshes (or at least it
 *  could, this has not yet been implemented at the moment).
 *
 *  @note The class may not be used by more than one thread*/
class BatchLoader
{
    // friend of Importer

public:

    //! @cond never
    // -------------------------------------------------------------------
    /** Wraps a full list of configuration properties for an importer.
     *  Properties can be set using SetGenericProperty */
    struct PropertyMap
    {
        ImporterPimpl::IntPropertyMap     ints;
        ImporterPimpl::FloatPropertyMap   floats;
        ImporterPimpl::StringPropertyMap  strings;
        ImporterPimpl::MatrixPropertyMap  matrices;

        bool operator == (const PropertyMap& prop) const {
            // fixme: really isocpp? gcc complains
            return ints == prop.ints && floats == prop.floats && strings == prop.strings && matrices == prop.matrices;
        }

        bool empty () const {
            return ints.empty() && floats.empty() && strings.empty() && matrices.empty();
        }
    };
    //! @endcond

public:


    // -------------------------------------------------------------------
    /** Construct a batch loader from a given IO system to be used
     *  to access external files */
    explicit BatchLoader(IOSystem* pIO);
    ~BatchLoader();


    // -------------------------------------------------------------------
    /** Add a new file to the list of files to be loaded.
     *  @param file File to be loaded
     *  @param steps Post-processing steps to be executed on the file
     *  @param map Optional configuration properties
     *  @return 'Load request channel' - an unique ID that can later
     *    be used to access the imported file data.
     *  @see GetImport */
    unsigned int AddLoadRequest (
        const std::string& file,
        unsigned int steps = 0,
        const PropertyMap* map = NULL
        );


    // -------------------------------------------------------------------
    /** Get an imported scene.
     *  This polls the import from the internal request list.
     *  If an import is requested several times, this function
     *  can be called several times, too.
     *
     *  @param which LRWC returned by AddLoadRequest().
     *  @return NULL if there is no scene with this file name
     *  in the queue of the scene hasn't been loaded yet. */
    aiScene* GetImport(
        unsigned int which
        );


    // -------------------------------------------------------------------
    /** Waits until all scenes have been loaded. This returns
     *  immediately if no scenes are queued.*/
    void LoadAll();

private:

    // No need to have that in the public API ...
    BatchData* data;
};

}



#endif