assimp/include/assimp/cexport.h

274 lines
12 KiB
C

/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
---------------------------------------------------------------------------
Copyright (c) 2006-2021, assimp team
All rights reserved.
Redistribution and use of this software in source and binary forms,
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* Redistributions in binary form must reproduce the above
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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 modifyable 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