assimp.assimp/include/assimp/Importer.hpp

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

Copyright (c) 2006-2025, assimp team

All rights reserved.

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* Redistributions of source code must retain the above
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  following disclaimer.

* Redistributions in binary form must reproduce the above
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  derived from this software without specific prior
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*/

/** @file  Importer.hpp
 *  @brief Defines the C++-API to the Open Asset Import Library.
 */
#pragma once
#ifndef AI_ASSIMP_HPP_INC
#define AI_ASSIMP_HPP_INC

#ifdef __GNUC__
#pragma GCC system_header
#endif

#ifndef __cplusplus
#error This header requires C++ to be used. Use assimp.h for plain C.
#endif // __cplusplus

// Public ASSIMP data structures
#include <assimp/types.h>

#include <exception>
#include <vector>

namespace Assimp {
// =======================================================================
// Public interface to Assimp
class Importer;
class IOStream;
class IOSystem;
class ProgressHandler;


// =======================================================================
// Plugin development
//
// Include the following headers for the declarations:
// BaseImporter.h
// BaseProcess.h
class BaseImporter;
class BaseProcess;
class SharedPostProcessInfo;
class BatchLoader;

// =======================================================================
// Holy stuff, only for members of the high council of the Jedi.
class ImporterPimpl;
} // namespace Assimp

#define AI_PROPERTY_WAS_NOT_EXISTING 0xffffffff

struct aiScene;

// importerdesc.h
struct aiImporterDesc;

/** @namespace Assimp Assimp's CPP-API and all internal APIs */
namespace Assimp {

// ----------------------------------------------------------------------------------
/** CPP-API: The Importer class forms an C++ interface to the functionality of the
*   Open Asset Import Library.
*
* Create an object of this class and call ReadFile() to import a file.
* If the import succeeds, the function returns a pointer to the imported data.
* The data remains property of the object, it is intended to be accessed
* read-only. The imported data will be destroyed along with the Importer
* object. If the import fails, ReadFile() returns a nullptr pointer. In this
* case you can retrieve a human-readable error description be calling
* GetErrorString(). You can call ReadFile() multiple times with a single Importer
* instance. Actually, constructing Importer objects involves quite many
* allocations and may take some time, so it's better to reuse them as often as
* possible.
*
* If you want to let assimp deal with OutOfMemory-exception make sure that
* ASSIMP_CATCH_GLOBAL_EXCEPTIONS is set.
* If this is not the case you need to catch the exception by yourself.
*
* If you need the Importer to do custom file handling to access the files,
* implement IOSystem and IOStream and supply an instance of your custom
* IOSystem implementation by calling SetIOHandler() before calling ReadFile().
* If you do not assign a custom IO handler, a default handler using the
* standard C++ IO logic will be used.
*
* @note One Importer instance is not thread-safe. If you use multiple
* threads for loading, each thread should maintain its own Importer instance.
*/
class ASSIMP_API Importer {
public:
    /**
     *  @brief The upper limit for hints.
     */
    static const unsigned int MaxLenHint = 200;

public:
    // -------------------------------------------------------------------
    /** Constructor. Creates an empty importer object.
     *
     * Call ReadFile() to start the import process. The configuration
     * property table is initially empty.
     */
    Importer();

    // -------------------------------------------------------------------
    /** Copy constructor.
     *
     * This copies the configuration properties of another Importer.
     * If this Importer owns a scene it won't be copied.
     * Call ReadFile() to start the import process.
     */
    Importer(const Importer &other) = delete;

    // -------------------------------------------------------------------
    /** Assignment operator has been deleted
     */
    Importer &operator=(const Importer &) = delete;

    // -------------------------------------------------------------------
    /** Destructor. The object kept ownership of the imported data,
     * which now will be destroyed along with the object.
     */
    ~Importer();

    // -------------------------------------------------------------------
    /** Registers a new loader.
     *
     * @param pImp Importer to be added. The Importer instance takes
     *   ownership of the pointer, so it will be automatically deleted
     *   with the Importer instance.
     * @return AI_SUCCESS if the loader has been added. The registration
     *   fails if there is already a loader for a specific file extension.
     */
    aiReturn RegisterLoader(BaseImporter *pImp);

    // -------------------------------------------------------------------
    /** Unregisters a loader.
     *
     * @param pImp Importer to be unregistered.
     * @return AI_SUCCESS if the loader has been removed. The function
     *   fails if the loader is currently in use (this could happen
     *   if the #Importer instance is used by more than one thread) or
     *   if it has not yet been registered.
     */
    aiReturn UnregisterLoader(BaseImporter *pImp);

    // -------------------------------------------------------------------
    /** Registers a new post-process step.
     *
     * At the moment, there's a small limitation: new post processing
     * steps are added to end of the list, or in other words, executed
     * last, after all built-in steps.
     * @param pImp Post-process step to be added. The Importer instance
     *   takes ownership of the pointer, so it will be automatically
     *   deleted with the Importer instance.
     * @return AI_SUCCESS if the step has been added correctly.
     */
    aiReturn RegisterPPStep(BaseProcess *pImp);

    // -------------------------------------------------------------------
    /** Unregisters a post-process step.
     *
     * @param pImp Step to be unregistered.
     * @return AI_SUCCESS if the step has been removed. The function
     *   fails if the step is currently in use (this could happen
     *   if the #Importer instance is used by more than one thread) or
     *   if it has not yet been registered.
     */
    aiReturn UnregisterPPStep(BaseProcess *pImp);

    // -------------------------------------------------------------------
    /** Set an integer configuration property.
     * @param szName Name of the property. All supported properties
     *   are defined in the aiConfig.g header (all constants share the
     *   prefix AI_CONFIG_XXX and are simple strings).
     * @param iValue New value of the property
     * @return true if the property was set before. The new value replaces
     *   the previous value in this case.
     * @note Property of different types (float, int, string ..) are kept
     *   on different stacks, so calling SetPropertyInteger() for a
     *   floating-point property has no effect - the loader will call
     *   GetPropertyFloat() to read the property, but it won't be there.
     */
    bool SetPropertyInteger(const char *szName, int iValue);

    // -------------------------------------------------------------------
    /** Set a boolean configuration property. Boolean properties
     *  are stored on the integer stack internally so it's possible
     *  to set them via #SetPropertyBool and query them with
     *  #GetPropertyBool and vice versa.
     * @see SetPropertyInteger()
     */
    bool SetPropertyBool(const char *szName, bool value) {
        return SetPropertyInteger(szName, value);
    }

    // -------------------------------------------------------------------
    /** Set a floating-point configuration property.
     * @see SetPropertyInteger()
     */
    bool SetPropertyFloat(const char *szName, ai_real fValue);

    // -------------------------------------------------------------------
    /** Set a string configuration property.
     * @see SetPropertyInteger()
     */
    bool SetPropertyString(const char *szName, const std::string &sValue);

    // -------------------------------------------------------------------
    /** Set a matrix configuration property.
     * @see SetPropertyInteger()
     */
    bool SetPropertyMatrix(const char *szName, const aiMatrix4x4 &sValue);

    // -------------------------------------------------------------------
    /** Set a pointer configuration property.
     * @see SetPropertyInteger()
     */
    bool SetPropertyPointer(const char *szName, void *sValue);

    // -------------------------------------------------------------------
    /** Get a configuration property.
     * @param szName Name of the property. All supported properties
     *   are defined in the aiConfig.g header (all constants share the
     *   prefix AI_CONFIG_XXX).
     * @param iErrorReturn Value that is returned if the property
     *   is not found.
     * @return Current value of the property
     * @note Property of different types (float, int, string ..) are kept
     *   on different lists, so calling SetPropertyInteger() for a
     *   floating-point property has no effect - the loader will call
     *   GetPropertyFloat() to read the property, but it won't be there.
     */
    int GetPropertyInteger(const char *szName,
            int iErrorReturn = 0xffffffff) const;

    // -------------------------------------------------------------------
    /** Get a boolean configuration property. Boolean properties
     *  are stored on the integer stack internally so it's possible
     *  to set them via #SetPropertyBool and query them with
     *  #GetPropertyBool and vice versa.
     * @see GetPropertyInteger()
     */
    bool GetPropertyBool(const char *szName, bool bErrorReturn = false) const {
        return GetPropertyInteger(szName, bErrorReturn) != 0;
    }

    // -------------------------------------------------------------------
    /** Get a floating-point configuration property
     * @see GetPropertyInteger()
     */
    ai_real GetPropertyFloat(const char *szName,
            ai_real fErrorReturn = 10e10) const;

    // -------------------------------------------------------------------
    /** Get a string configuration property
     *
     *  The return value remains valid until the property is modified.
     * @see GetPropertyInteger()
     */
    std::string GetPropertyString(const char *szName,
            const std::string &sErrorReturn = std::string()) const;

    // -------------------------------------------------------------------
    /** Get a matrix configuration property
     *
     *  The return value remains valid until the property is modified.
     * @see GetPropertyInteger()
     */
    aiMatrix4x4 GetPropertyMatrix(const char *szName,
            const aiMatrix4x4 &sErrorReturn = aiMatrix4x4()) const;

    // -------------------------------------------------------------------
    /** Get a pointer configuration property
     *
     *  The return value remains valid until the property is modified.
     * @see GetPropertyInteger()
     */
    void* GetPropertyPointer(const char *szName,
        void *sErrorReturn = nullptr) const;

    // -------------------------------------------------------------------
    /** Supplies a custom IO handler to the importer to use to open and
     * access files. If you need the importer to use custom IO logic to
     * access the files, you need to provide a custom implementation of
     * IOSystem and IOFile to the importer. Then create an instance of
     * your custom IOSystem implementation and supply it by this function.
     *
     * The Importer takes ownership of the object and will destroy it
     * afterwards. The previously assigned handler will be deleted.
     * Pass nullptr to take again ownership of your IOSystem and reset Assimp
     * to use its default implementation.
     *
     * @param pIOHandler The IO handler to be used in all file accesses
     *   of the Importer.
     */
    void SetIOHandler(IOSystem *pIOHandler);

    // -------------------------------------------------------------------
    /** Retrieves the IO handler that is currently set.
     * You can use #IsDefaultIOHandler() to check whether the returned
     * interface is the default IO handler provided by ASSIMP. The default
     * handler is active as long the application doesn't supply its own
     * custom IO handler via #SetIOHandler().
     * @return A valid IOSystem interface, never nullptr.
     */
    IOSystem *GetIOHandler() const;

    // -------------------------------------------------------------------
    /** Checks whether a default IO handler is active
     * A default handler is active as long the application doesn't
     * supply its own custom IO handler via #SetIOHandler().
     * @return true by default
     */
    bool IsDefaultIOHandler() const;

    // -------------------------------------------------------------------
    /** Supplies a custom progress handler to the importer. This
     *  interface exposes an #Update() callback, which is called
     *  more or less periodically (please don't sue us if it
     *  isn't as periodically as you'd like it to have ...).
     *  This can be used to implement progress bars and loading
     *  timeouts.
     *  @param pHandler Progress callback interface. Pass nullptr to
     *    disable progress reporting.
     *  @note Progress handlers can be used to abort the loading
     *    at almost any time.*/
    void SetProgressHandler(ProgressHandler *pHandler);

    // -------------------------------------------------------------------
    /** Retrieves the progress handler that is currently set.
     * You can use #IsDefaultProgressHandler() to check whether the returned
     * interface is the default handler provided by ASSIMP. The default
     * handler is active as long the application doesn't supply its own
     * custom handler via #SetProgressHandler().
     * @return A valid ProgressHandler interface, never nullptr.
     */
    ProgressHandler *GetProgressHandler() const;

    // -------------------------------------------------------------------
    /** Checks whether a default progress handler is active
     * A default handler is active as long the application doesn't
     * supply its own custom progress handler via #SetProgressHandler().
     * @return true by default
     */
    bool IsDefaultProgressHandler() const;

    // -------------------------------------------------------------------
    /** @brief Check whether a given set of post-processing flags
     *  is supported.
     *
     *  Some flags are mutually exclusive, others are probably
     *  not available because your excluded them from your
     *  Assimp builds. Calling this function is recommended if
     *  you're unsure.
     *
     *  @param pFlags Bitwise combination of the aiPostProcess flags.
     *  @return true if this flag combination is fine.
     */
    bool ValidateFlags(unsigned int pFlags) const;

    // -------------------------------------------------------------------
    /** Reads the given file and returns its contents if successful.
     *
     * If the call succeeds, the contents of the file are returned as a
     * pointer to an aiScene object. The returned data is intended to be
     * read-only, the importer object keeps ownership of the data and will
     * destroy it upon destruction. If the import fails, nullptr is returned.
     * A human-readable error description can be retrieved by calling
     * GetErrorString(). The previous scene will be deleted during this call.
     * @param pFile Path and filename to the file to be imported.
     * @param pFlags Optional post processing steps to be executed after
     *   a successful import. Provide a bitwise combination of the
     *   #aiPostProcessSteps flags. If you wish to inspect the imported
     *   scene first in order to fine-tune your post-processing setup,
     *   consider to use #ApplyPostProcessing().
     * @return A pointer to the imported data, nullptr if the import failed.
     *   The pointer to the scene remains in possession of the Importer
     *   instance. Use GetOrphanedScene() to take ownership of it.
     *
     * @note Assimp is able to determine the file format of a file
     * automatically.
     */
    const aiScene *ReadFile(
            const char *pFile,
            unsigned int pFlags);

    // -------------------------------------------------------------------
    /** Reads the given file from a memory buffer and returns its
     *  contents if successful.
     *
     * If the call succeeds, the contents of the file are returned as a
     * pointer to an aiScene object. The returned data is intended to be
     * read-only, the importer object keeps ownership of the data and will
     * destroy it upon destruction. If the import fails, nullptr is returned.
     * A human-readable error description can be retrieved by calling
     * GetErrorString(). The previous scene will be deleted during this call.
     * Calling this method doesn't affect the active IOSystem.
     * @param pBuffer Pointer to the file data
     * @param pLength Length of pBuffer, in bytes
     * @param pFlags Optional post processing steps to be executed after
     *   a successful import. Provide a bitwise combination of the
     *   #aiPostProcessSteps flags. If you wish to inspect the imported
     *   scene first in order to fine-tune your post-processing setup,
     *   consider to use #ApplyPostProcessing().
     * @param pHint An additional hint to the library. If this is a non
     *   empty string, the library looks for a loader to support
     *   the file extension specified by pHint and passes the file to
     *   the first matching loader. If this loader is unable to completely
     *   the request, the library continues and tries to determine the
     *   file format on its own, a task that may or may not be successful.
     *   Check the return value, and you'll know ...
     * @return A pointer to the imported data, nullptr if the import failed.
     *   The pointer to the scene remains in possession of the Importer
     *   instance. Use GetOrphanedScene() to take ownership of it.
     *
     * @note This is a straightforward way to decode models from memory
     * buffers, but it doesn't handle model formats that spread their
     * data across multiple files or even directories. Examples include
     * OBJ or MD3, which outsource parts of their material info into
     * external scripts. If you need full functionality, provide
     * a custom IOSystem to make Assimp find these files and use
     * the regular ReadFile() API.
     */
    const aiScene *ReadFileFromMemory(
            const void *pBuffer,
            size_t pLength,
            unsigned int pFlags,
            const char *pHint = "");

    // -------------------------------------------------------------------
    /** Apply post-processing to an already-imported scene.
     *
     *  This is strictly equivalent to calling #ReadFile() with the same
     *  flags. However, you can use this separate function to inspect
     *  the imported scene first to fine-tune your post-processing setup.
     *  @param pFlags Provide a bitwise combination of the
     *   #aiPostProcessSteps flags.
     *  @return A pointer to the post-processed data. This is still the
     *   same as the pointer returned by #ReadFile(). However, if
     *   post-processing fails, the scene could now be nullptr.
     *   That's quite a rare case, post processing steps are not really
     *   designed to 'fail'. To be exact, the #aiProcess_ValidateDS
     *   flag is currently the only post processing step which can actually
     *   cause the scene to be reset to nullptr.
     *
     *  @note The method does nothing if no scene is currently bound
     *    to the #Importer instance.  */
    const aiScene *ApplyPostProcessing(unsigned int pFlags);

    const aiScene *ApplyCustomizedPostProcessing(BaseProcess *rootProcess, bool requestValidation);

    // -------------------------------------------------------------------
    /** @brief Reads the given file and returns its contents if successful.
     *
     * This function is provided for backward compatibility.
     * See the const char* version for detailed docs.
     * @see ReadFile(const char*, pFlags)  */
    const aiScene *ReadFile(
            const std::string &pFile,
            unsigned int pFlags);

    // -------------------------------------------------------------------
    /** Frees the current scene.
     *
     *  The function does nothing if no scene has previously been
     *  read via ReadFile(). FreeScene() is called automatically by the
     *  destructor and ReadFile() itself.  */
    void FreeScene();

    // -------------------------------------------------------------------
    /** Returns an error description of an error that occurred in ReadFile().
     *
     * Returns an empty string if no error occurred.
     * @return A description of the last error, an empty string if no
     *   error occurred. The string is never nullptr.
     *
     * @note The returned function remains valid until one of the
     * following methods is called: #ReadFile(), #FreeScene(). */
    const char *GetErrorString() const;

    // -------------------------------------------------------------------
    /** Returns an exception if one occurred during import.
     *
     * @return The last exception which occurred.
     *
     * @note The returned value remains valid until one of the
     * following methods is called: #ReadFile(), #FreeScene(). */
    const std::exception_ptr& GetException() const;

    // -------------------------------------------------------------------
    /** Returns the scene loaded by the last successful call to ReadFile()
     *
     * @return Current scene or nullptr if there is currently no scene loaded */
    const aiScene *GetScene() const;

    // -------------------------------------------------------------------
    /** Returns the scene loaded by the last successful call to ReadFile()
     *  and releases the scene from the ownership of the Importer
     *  instance. The application is now responsible for deleting the
     *  scene. Any further calls to GetScene() or GetOrphanedScene()
     *  will return nullptr - until a new scene has been loaded via ReadFile().
     *
     * @return Current scene or nullptr if there is currently no scene loaded
     * @note Use this method with maximal caution, and only if you have to.
     *   By design, aiScene's are exclusively maintained, allocated and
     *   deallocated by Assimp and no one else. The reasoning behind this
     *   is the golden rule that deallocations should always be done
     *   by the module that did the original allocation because heaps
     *   are not necessarily shared. GetOrphanedScene() enforces you
     *   to delete the returned scene by yourself, but this will only
     *   be fine if and only if you're using the same heap as assimp.
     *   On Windows, it's typically fine provided everything is linked
     *   against the multithreaded-dll version of the runtime library.
     *   It will work as well for static linkage with Assimp.*/
    aiScene *GetOrphanedScene();

    // -------------------------------------------------------------------
    /** Returns whether a given file extension is supported by ASSIMP.
     *
     * @param szExtension Extension to be checked.
     *   Must include a trailing dot '.'. Example: ".3ds", ".md3".
     *   Cases-insensitive.
     * @return true if the extension is supported, false otherwise */
    bool IsExtensionSupported(const char *szExtension) const;

    // -------------------------------------------------------------------
    /** @brief Returns whether a given file extension is supported by ASSIMP.
     *
     * This function is provided for backward compatibility.
     * See the const char* version for detailed and up-to-date docs.
     * @see IsExtensionSupported(const char*) */
    inline bool IsExtensionSupported(const std::string &szExtension) const;

    // -------------------------------------------------------------------
    /** Get a full list of all file extensions supported by ASSIMP.
     *
     * If a file extension is contained in the list this does of course not
     * mean that ASSIMP is able to load all files with this extension ---
     * it simply means there is an importer loaded which claims to handle
     * files with this file extension.
     * @param szOut String to receive the extension list.
     *   Format of the list: "*.3ds;*.obj;*.dae". This is useful for
     *   use with the WinAPI call GetOpenFileName(Ex). */
    void GetExtensionList(aiString &szOut) const;

    // -------------------------------------------------------------------
    /** @brief Get a full list of all file extensions supported by ASSIMP.
     *
     * This function is provided for backward compatibility.
     * See the aiString version for detailed and up-to-date docs.
     * @see GetExtensionList(aiString&)*/
    inline void GetExtensionList(std::string &szOut) const;

    // -------------------------------------------------------------------
    /** Get the number of importers currently registered with Assimp. */
    size_t GetImporterCount() const;

    // -------------------------------------------------------------------
    /** Get meta data for the importer corresponding to a specific index..
    *
    *  For the declaration of #aiImporterDesc, include <assimp/importerdesc.h>.
    *  @param index Index to query, must be within [0,GetImporterCount())
    *  @return Importer meta data structure, nullptr if the index does not
    *     exist or if the importer doesn't offer meta information (
    *     importers may do this at the cost of being hated by their peers).*/
    const aiImporterDesc *GetImporterInfo(size_t index) const;

    // -------------------------------------------------------------------
    /** Find the importer corresponding to a specific index.
    *
    *  @param index Index to query, must be within [0,GetImporterCount())
    *  @return Importer instance. nullptr if the index does not
    *     exist. */
    BaseImporter *GetImporter(size_t index) const;

    // -------------------------------------------------------------------
    /** Find the importer corresponding to a specific file extension.
    *
    *  This is quite similar to #IsExtensionSupported except a
    *  BaseImporter instance is returned.
    *  @param szExtension Extension to check for. The following formats
    *    are recognized (BAH being the file extension): "BAH" (comparison
    *    is case-insensitive), ".bah", "*.bah" (wild card and dot
    *    characters at the beginning of the extension are skipped).
    *  @return nullptr if no importer is found*/
    BaseImporter *GetImporter(const char *szExtension) const;

    // -------------------------------------------------------------------
    /** Find the importer index corresponding to a specific file extension.
    *
    *  @param szExtension Extension to check for. The following formats
    *    are recognized (BAH being the file extension): "BAH" (comparison
    *    is case-insensitive), ".bah", "*.bah" (wild card and dot
    *    characters at the beginning of the extension are skipped).
    *  @return (size_t)-1 if no importer is found */
    size_t GetImporterIndex(const char *szExtension) const;

    // -------------------------------------------------------------------
    /** Returns the storage allocated by ASSIMP to hold the scene data
     * in memory.
     *
     * This refers to the currently loaded file, see #ReadFile().
     * @param in Data structure to be filled.
     * @note The returned memory statistics refer to the actual
     *   size of the use data of the aiScene. Heap-related overhead
     *   is (naturally) not included.*/
    void GetMemoryRequirements(aiMemoryInfo &in) const;

    // -------------------------------------------------------------------
    /** Enables "extra verbose" mode.
     *
     * 'Extra verbose' means the data structure is validated after *every*
     * single post processing step to make sure everyone modifies the data
     * structure in a well-defined manner. This is a debug feature and not
     * intended for use in production environments. */
    void SetExtraVerbose(bool bDo);

    // -------------------------------------------------------------------
    /** Private, do not use. */
    ImporterPimpl *Pimpl() { return pimpl; }
    const ImporterPimpl *Pimpl() const { return pimpl; }

protected:
    // Just because we don't want you to know how we're hacking around.
    ImporterPimpl *pimpl;
}; //! class Importer

// ----------------------------------------------------------------------------
// For compatibility, the interface of some functions taking a std::string was
// changed to const char* to avoid crashes between binary incompatible STL
// versions. This code her is inlined,  so it shouldn't cause any problems.
// ----------------------------------------------------------------------------

// ----------------------------------------------------------------------------
AI_FORCE_INLINE const aiScene *Importer::ReadFile(const std::string &pFile, unsigned int pFlags) {
    return ReadFile(pFile.c_str(), pFlags);
}
// ----------------------------------------------------------------------------
AI_FORCE_INLINE void Importer::GetExtensionList(std::string &szOut) const {
    aiString s;
    GetExtensionList(s);
    szOut = s.data;
}
// ----------------------------------------------------------------------------
AI_FORCE_INLINE bool Importer::IsExtensionSupported(const std::string &szExtension) const {
    return IsExtensionSupported(szExtension.c_str());
}

} // namespace Assimp

#endif // AI_ASSIMP_HPP_INC