assimp/include/export.hpp

305 lines
13 KiB
C++

/*
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Open Asset Import Library (assimp)
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Copyright (c) 2006-2011, assimp team
All rights reserved.
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*/
/** @file export.hpp
* @brief Defines the CPP-API for the Assimp export interface
*/
#ifndef AI_EXPORT_HPP_INC
#define AI_EXPORT_HPP_INC
#ifndef ASSIMP_BUILD_NO_EXPORT
#include "export.h"
namespace Assimp {
class ExporterPimpl;
// ----------------------------------------------------------------------------------
/** CPP-API: The Exporter class forms an C++ interface to the export functionality
* of the Open Asset Import Library. Note that the export interface is available
* only if Assimp has been built with ASSIMP_BUILD_NO_EXPORT not defined.
*
* The interface is modelled after the importer interface and mostly
* symmetric. The same rules for threading etc. apply.
*
* In a nutshell, there are two export interfaces: #Export, which writes the
* output file(s) either to the regular file system or to a user-supplied
* #IOSystem, and #ExportToBlob which returns a linked list of memory
* buffers (blob), each referring to one output file (in most cases
* there will be only one output file of course, but this extra complexity is
* needed since Assimp aims at supporting a wide range of file formats).
*
* #ExportToBlob is especially useful if you intend to work
* with the data in-memory.
*/
class ASSIMP_API Exporter
// TODO: causes good ol' base class has no dll interface warning
//#ifdef __cplusplus
// : public boost::noncopyable
//#endif // __cplusplus
{
public:
/** Function pointer type of a Export worker function */
typedef void (*fpExportFunc)(const char*,IOSystem*,const aiScene*);
/** Internal description of an Assimp export format option */
struct ExportFormatEntry
{
/// Public description structure to be returned by aiGetExportFormatDescription()
aiExportFormatDesc mDescription;
// Worker function to do the actual exporting
fpExportFunc mExportFunction;
// Postprocessing steps to be executed PRIOR to invoking mExportFunction
unsigned int mEnforcePP;
// Constructor to fill all entries
ExportFormatEntry( const char* pId, const char* pDesc, const char* pExtension, fpExportFunc pFunction, unsigned int pEnforcePP = 0u)
{
mDescription.id = pId;
mDescription.description = pDesc;
mDescription.fileExtension = pExtension;
mExportFunction = pFunction;
mEnforcePP = pEnforcePP;
}
ExportFormatEntry() : mExportFunction(), mEnforcePP() {}
};
public:
Exporter();
~Exporter();
public:
// -------------------------------------------------------------------
/** Supplies a custom IO handler to the exporter to use to open and
* access files.
*
* If you need #Export to use custom IO logic to access the files,
* you need to supply a custom implementation of IOSystem and
* IOFile to the exporter.
*
* #Exporter takes ownership of the object and will destroy it
* afterwards. The previously assigned handler will be deleted.
* Pass NULL to take again ownership of your IOSystem and reset Assimp
* to use its default implementation, which uses plain file IO.
*
* @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 NULL. */
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;
// -------------------------------------------------------------------
/** 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, simply let the #Exporter instance go
* out of scope to have it released automatically.
* @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
* #GetExportFormatCount / #GetExportFormatDescription to learn which
* export formats are available.
* @param pPreprocessing See the documentation for #Export
* @return the exported data or NULL in case of error.
* @note If the Exporter instance did already hold a blob from
* a previous call to #ExportToBlob, it will be disposed.
* Any IO handlers set via #SetIOHandler are ignored here.*/
const aiExportDataBlob* ExportToBlob( const aiScene* pScene, const char* pFormatId, unsigned int pPreprocessing = 0u );
inline const aiExportDataBlob* ExportToBlob( const aiScene* pScene, const std::string& pFormatId, unsigned int pPreprocessing = 0u );
// -------------------------------------------------------------------
/** Convenience function to export directly to a file. Use
* #SetIOSystem to supply a custom IOSystem to gain fine-grained control
* about the output data flow of the export process.
* @param pBlob A data blob obtained from a previous call to #aiExportScene. Must not be NULL.
* @param pPath Full target file name. Target must be accessible.
* @param pPreprocessing Accepts any choice of the #aiPostProcessing 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 even if it wasn't requested.
* @return AI_SUCCESS if everything was fine. */
aiReturn Export( const aiScene* pScene, const char* pFormatId, const char* pPath, unsigned int pPreprocessing = 0u);
inline aiReturn Export( const aiScene* pScene, const std::string& pFormatId, const std::string& pPath, unsigned int pPreprocessing = 0u);
// -------------------------------------------------------------------
/** Returns an error description of an error that occurred in #Export
* or #ExportToBlob
*
* 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 NULL.
*
* @note The returned function remains valid until one of the
* following methods is called: #Export, #ExportToBlob, #FreeBlob */
const char* GetErrorString() const;
// -------------------------------------------------------------------
/** Return the blob obtained from the last call to #ExportToBlob */
const aiExportDataBlob* GetBlob() const;
// -------------------------------------------------------------------
/** Orphan the blob from the last call to #ExportToBlob. This means
* the caller takes ownership and is thus responsible for calling
* the C API function #aiReleaseExportBlob to release it. */
const aiExportDataBlob* GetOrphanedBlob() const;
// -------------------------------------------------------------------
/** Frees the current blob.
*
* The function does nothing if no blob has previously been
* previously produced via #ExportToBlob. #FreeBlob is called
* automatically by the destructor. The only reason to call
* it manually would be to reclain as much storage as possible
* without giving up the #Exporter instance yet. */
void FreeBlob( );
// -------------------------------------------------------------------
/** Returns the number of export file formats available in the current
* Assimp build. Use #Exporter::GetExportFormatDescription to
* retrieve infos of a specific export format */
size_t GetExportFormatCount() const;
// -------------------------------------------------------------------
/** Returns a description of the nth export file format. Use #
* #Exporter::GetExportFormatCount to learn how many export
* formats are supported.
* @param pIndex Index of the export format to retrieve information
* for. Valid range is 0 to #Exporter::GetExportFormatCount
* @return A description of that specific export format.
* NULL if pIndex is out of range. */
const aiExportFormatDesc* GetExportFormatDescription( size_t pIndex ) const;
// -------------------------------------------------------------------
/** Register a custom exporter. Custom export formats are limited to
* to the current #Exporter instance and do not affect the
* library globally.
* @param desc Exporter description.
* @return aiReturn_SUCCESS if the export format was successfully
* registered. A common cause that would prevent an exporter
* from being registered is that its format id is already
* occupied by another format. */
aiReturn RegisterExporter(const ExportFormatEntry& desc);
// -------------------------------------------------------------------
/** Remove an export format previously registered with #RegisterExporter
* from the #Exporter instance (this can also be used to drop
* builtin exporters because those are implicitly registered
* using #RegisterExporter).
* @param id Format id to be unregistered, this refers to the
* 'id' field of #aiExportFormatDesc.
* @note Calling this method on a format description not yet registered
* has no effect.*/
void UnregisterExporter(const char* id);
protected:
// Just because we don't want you to know how we're hacking around.
ExporterPimpl* pimpl;
};
// ----------------------------------------------------------------------------------
inline const aiExportDataBlob* Exporter :: ExportToBlob( const aiScene* pScene, const std::string& pFormatId,unsigned int pPreprocessing )
{
return ExportToBlob(pScene,pFormatId.c_str(),pPreprocessing);
}
// ----------------------------------------------------------------------------------
inline aiReturn Exporter :: Export( const aiScene* pScene, const std::string& pFormatId, const std::string& pPath, unsigned int pPreprocessing )
{
return Export(pScene,pFormatId.c_str(),pPath.c_str(),pPreprocessing);
}
} // namespace Assimp
#endif // ASSIMP_BUILD_NO_EXPORT
#endif // AI_EXPORT_HPP_INC