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 /*
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 Open Asset Import Library (assimp)
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 Copyright (c) 2006-2024, assimp team
 
 All rights reserved.
 
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 */
 
 /** @file  cexport.h
 *  @brief Defines the C-API for the Assimp export interface
 */
 #pragma once
 #ifndef AI_EXPORT_H_INC
 #define AI_EXPORT_H_INC
 
 #ifdef __GNUC__
 #pragma GCC system_header
 #endif
 
 #ifndef ASSIMP_BUILD_NO_EXPORT
 
 #include <assimp/types.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 struct aiScene;
 struct aiFileIO;
 
 // --------------------------------------------------------------------------------
 /**
  *  @brief  Describes an file format which Assimp can export to.
  *
  *  Use #aiGetExportFormatCount() to learn how many export-formats are supported by
  *  the current Assimp-build and #aiGetExportFormatDescription() to retrieve the
  *  description of the export format option.
  */
 struct aiExportFormatDesc {
     /// a short string ID to uniquely identify the export format. Use this ID string to
     /// specify which file format you want to export to when calling #aiExportScene().
     /// Example: "dae" or "obj"
     const char *id;
 
     /// A short description of the file format to present to users. Useful if you want
     /// to allow the user to select an export format.
     const char *description;
 
     /// Recommended file extension for the exported file in lower case.
     const char *fileExtension;
 };
 
 // --------------------------------------------------------------------------------
 /** Returns the number of export file formats available in the current Assimp build.
  * Use aiGetExportFormatDescription() to retrieve infos of a specific export format.
  */
 ASSIMP_API size_t aiGetExportFormatCount(void);
 
 // --------------------------------------------------------------------------------
 /** Returns a description of the nth export file format. Use #aiGetExportFormatCount()
  * to learn how many export formats are supported. The description must be released by
  * calling aiReleaseExportFormatDescription afterwards.
  * @param pIndex Index of the export format to retrieve information for. Valid range is
  *    0 to #aiGetExportFormatCount()
  * @return A description of that specific export format. NULL if pIndex is out of range.
  */
 ASSIMP_API const C_STRUCT aiExportFormatDesc *aiGetExportFormatDescription(size_t pIndex);
 
 // --------------------------------------------------------------------------------
 /** Release a description of the nth export file format. Must be returned by
 * aiGetExportFormatDescription
 * @param desc Pointer to the description
 */
 ASSIMP_API void aiReleaseExportFormatDescription(const C_STRUCT aiExportFormatDesc *desc);
 
 // --------------------------------------------------------------------------------
 /** Create a modifiable copy of a scene.
  *  This is useful to import files via Assimp, change their topology and
  *  export them again. Since the scene returned by the various importer functions
  *  is const, a modifiable copy is needed.
  *  @param pIn Valid scene to be copied
  *  @param pOut Receives a modifiable copy of the scene. Use aiFreeScene() to
  *    delete it again.
  */
 ASSIMP_API void aiCopyScene(const C_STRUCT aiScene *pIn,
         C_STRUCT aiScene **pOut);
 
 // --------------------------------------------------------------------------------
 /** Frees a scene copy created using aiCopyScene() */
 ASSIMP_API void aiFreeScene(const C_STRUCT aiScene *pIn);
 
 // --------------------------------------------------------------------------------
 /** Exports the given scene to a chosen file format and writes the result file(s) to disk.
 * @param pScene The scene to export. Stays in possession of the caller, is not changed by the function.
 *   The scene is expected to conform to Assimp's Importer output format as specified
 *   in the @link data Data Structures Page @endlink. In short, this means the model data
 *   should use a right-handed coordinate systems, face winding should be counter-clockwise
 *   and the UV coordinate origin is assumed to be in the upper left. If your input data
 *   uses different conventions, have a look at the last parameter.
 * @param pFormatId ID string to specify to which format you want to export to. Use
 * aiGetExportFormatCount() / aiGetExportFormatDescription() to learn which export formats are available.
 * @param pFileName Output file to write
 * @param pPreprocessing Accepts any choice of the #aiPostProcessSteps enumerated
 *   flags, but in reality only a subset of them makes sense here. Specifying
 *   'preprocessing' flags is useful if the input scene does not conform to
 *   Assimp's default conventions as specified in the @link data Data Structures Page @endlink.
 *   In short, this means the geometry data should use a right-handed coordinate systems, face
 *   winding should be counter-clockwise and the UV coordinate origin is assumed to be in
 *   the upper left. The #aiProcess_MakeLeftHanded, #aiProcess_FlipUVs and
 *   #aiProcess_FlipWindingOrder flags are used in the import side to allow users
 *   to have those defaults automatically adapted to their conventions. Specifying those flags
 *   for exporting has the opposite effect, respectively. Some other of the
 *   #aiPostProcessSteps enumerated values may be useful as well, but you'll need
 *   to try out what their effect on the exported file is. Many formats impose
 *   their own restrictions on the structure of the geometry stored therein,
 *   so some preprocessing may have little or no effect at all, or may be
 *   redundant as exporters would apply them anyhow. A good example
 *   is triangulation - whilst you can enforce it by specifying
 *   the #aiProcess_Triangulate flag, most export formats support only
 *   triangulate data so they would run the step anyway.
 *
 *   If assimp detects that the input scene was directly taken from the importer side of
 *   the library (i.e. not copied using aiCopyScene and potentially modified afterwards),
 *   any post-processing steps already applied to the scene will not be applied again, unless
 *   they show non-idempotent behavior (#aiProcess_MakeLeftHanded, #aiProcess_FlipUVs and
 *   #aiProcess_FlipWindingOrder).
 * @return a status code indicating the result of the export
 * @note Use aiCopyScene() to get a modifiable copy of a previously
 *   imported scene.
 */
 ASSIMP_API aiReturn aiExportScene(const C_STRUCT aiScene *pScene,
         const char *pFormatId,
         const char *pFileName,
         unsigned int pPreprocessing);
 
 // --------------------------------------------------------------------------------
 /** Exports the given scene to a chosen file format using custom IO logic supplied by you.
 * @param pScene The scene to export. Stays in possession of the caller, is not changed by the function.
 * @param pFormatId ID string to specify to which format you want to export to. Use
 * aiGetExportFormatCount() / aiGetExportFormatDescription() to learn which export formats are available.
 * @param pFileName Output file to write
 * @param pIO custom IO implementation to be used. Use this if you use your own storage methods.
 *   If none is supplied, a default implementation using standard file IO is used. Note that
 *   #aiExportSceneToBlob is provided as convenience function to export to memory buffers.
 * @param pPreprocessing Please see the documentation for #aiExportScene
 * @return a status code indicating the result of the export
 * @note Include <aiFileIO.h> for the definition of #aiFileIO.
 * @note Use aiCopyScene() to get a modifiable copy of a previously
 *   imported scene.
 */
 ASSIMP_API aiReturn aiExportSceneEx(const C_STRUCT aiScene *pScene,
         const char *pFormatId,
         const char *pFileName,
         C_STRUCT aiFileIO *pIO,
         unsigned int pPreprocessing);
 
 // --------------------------------------------------------------------------------
 /** Describes a blob of exported scene data. Use #aiExportSceneToBlob() to create a blob containing an
 * exported scene. The memory referred by this structure is owned by Assimp.
 * to free its resources. Don't try to free the memory on your side - it will crash for most build configurations
 * due to conflicting heaps.
 *
 * Blobs can be nested - each blob may reference another blob, which may in turn reference another blob and so on.
 * This is used when exporters write more than one output file for a given #aiScene. See the remarks for
 * #aiExportDataBlob::name for more information.
 */
 struct aiExportDataBlob {
     /// Size of the data in bytes
     size_t size;
 
     /// The data.
     void *data;
 
     /** Name of the blob. An empty string always
       * indicates the first (and primary) blob,
       * which contains the actual file data.
       * Any other blobs are auxiliary files produced
       * by exporters (i.e. material files). Existence
       * of such files depends on the file format. Most
       * formats don't split assets across multiple files.
       *
       * If used, blob names usually contain the file
       * extension that should be used when writing
       * the data to disc.
       *
       * The blob names generated can be influenced by
       * setting the #AI_CONFIG_EXPORT_BLOB_NAME export
       * property to the name that is used for the master
       * blob. All other names are typically derived from
       * the base name, by the file format exporter.
      */
     C_STRUCT aiString name;
 
     /** Pointer to the next blob in the chain or NULL if there is none. */
     C_STRUCT aiExportDataBlob *next;
 
 #ifdef __cplusplus
     /// Default constructor
     aiExportDataBlob() {
         size = 0;
         data = next = nullptr;
     }
     /// Releases the data
     ~aiExportDataBlob() {
         delete[] static_cast<unsigned char *>(data);
         delete next;
     }
 
     aiExportDataBlob(const aiExportDataBlob &) = delete;
     aiExportDataBlob &operator=(const aiExportDataBlob &) = delete;
 
 #endif // __cplusplus
 };
 
 // --------------------------------------------------------------------------------
 /** Exports the given scene to a chosen file format. Returns the exported data as a binary blob which
 * you can write into a file or something. When you're done with the data, use #aiReleaseExportBlob()
 * to free the resources associated with the export.
 * @param pScene The scene to export. Stays in possession of the caller, is not changed by the function.
 * @param pFormatId ID string to specify to which format you want to export to. Use
 * #aiGetExportFormatCount() / #aiGetExportFormatDescription() to learn which export formats are available.
 * @param pPreprocessing Please see the documentation for #aiExportScene
 * @return the exported data or NULL in case of error
 */
 ASSIMP_API const C_STRUCT aiExportDataBlob *aiExportSceneToBlob(const C_STRUCT aiScene *pScene, const char *pFormatId,
         unsigned int pPreprocessing);
 
 // --------------------------------------------------------------------------------
 /** Releases the memory associated with the given exported data. Use this function to free a data blob
 * returned by aiExportScene().
 * @param pData the data blob returned by #aiExportSceneToBlob
 */
 ASSIMP_API void aiReleaseExportBlob(const C_STRUCT aiExportDataBlob *pData);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif // ASSIMP_BUILD_NO_EXPORT
 #endif // AI_EXPORT_H_INC

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