371 lines
14 KiB
C++
371 lines
14 KiB
C++
/*
|
|
Open Asset Import Library (assimp)
|
|
----------------------------------------------------------------------
|
|
|
|
Copyright (c) 2006-2012, assimp team
|
|
All rights reserved.
|
|
|
|
Redistribution and use of this software in source and binary forms,
|
|
with or without modification, are permitted provided that the
|
|
following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above
|
|
copyright notice, this list of conditions and the
|
|
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
|
|
materials provided with the distribution.
|
|
|
|
* Neither the name of the assimp team, nor the names of its
|
|
contributors may be used to endorse or promote products
|
|
derived from this software without specific prior
|
|
written permission of the assimp team.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
----------------------------------------------------------------------
|
|
*/
|
|
|
|
/** @file Definition of the base class for all importer worker classes. */
|
|
#ifndef INCLUDED_AI_BASEIMPORTER_H
|
|
#define INCLUDED_AI_BASEIMPORTER_H
|
|
|
|
#include "Exceptional.h"
|
|
|
|
#include <string>
|
|
#include <map>
|
|
#include <vector>
|
|
#include "./../include/assimp/types.h"
|
|
|
|
struct aiScene;
|
|
|
|
namespace Assimp {
|
|
|
|
class IOSystem;
|
|
class Importer;
|
|
class BaseImporter;
|
|
class BaseProcess;
|
|
class SharedPostProcessInfo;
|
|
class IOStream;
|
|
|
|
// utility to do char4 to uint32 in a portable manner
|
|
#define AI_MAKE_MAGIC(string) ((uint32_t)((string[0] << 24) + \
|
|
(string[1] << 16) + (string[2] << 8) + string[3]))
|
|
|
|
// ---------------------------------------------------------------------------
|
|
template <typename T>
|
|
struct ScopeGuard
|
|
{
|
|
ScopeGuard(T* obj) : obj(obj), mdismiss() {}
|
|
~ScopeGuard () throw() {
|
|
if (!mdismiss) {
|
|
delete obj;
|
|
}
|
|
obj = NULL;
|
|
}
|
|
|
|
T* dismiss() {
|
|
mdismiss=true;
|
|
return obj;
|
|
}
|
|
|
|
operator T*() {
|
|
return obj;
|
|
}
|
|
|
|
T* operator -> () {
|
|
return obj;
|
|
}
|
|
|
|
private:
|
|
T* obj;
|
|
bool mdismiss;
|
|
};
|
|
|
|
|
|
|
|
// ---------------------------------------------------------------------------
|
|
/** FOR IMPORTER PLUGINS ONLY: The BaseImporter defines a common interface
|
|
* for all importer worker classes.
|
|
*
|
|
* The interface defines two functions: CanRead() is used to check if the
|
|
* importer can handle the format of the given file. If an implementation of
|
|
* this function returns true, the importer then calls ReadFile() which
|
|
* imports the given file. ReadFile is not overridable, it just calls
|
|
* InternReadFile() and catches any ImportErrorException that might occur.
|
|
*/
|
|
class BaseImporter
|
|
{
|
|
friend class Importer;
|
|
|
|
public:
|
|
|
|
/** Constructor to be privately used by #Importer */
|
|
BaseImporter();
|
|
|
|
/** Destructor, private as well */
|
|
virtual ~BaseImporter();
|
|
|
|
public:
|
|
// -------------------------------------------------------------------
|
|
/** Returns whether the class can handle the format of the given file.
|
|
*
|
|
* The implementation should be as quick as possible. A check for
|
|
* the file extension is enough. If no suitable loader is found with
|
|
* this strategy, CanRead() is called again, the 'checkSig' parameter
|
|
* set to true this time. Now the implementation is expected to
|
|
* perform a full check of the file structure, possibly searching the
|
|
* first bytes of the file for magic identifiers or keywords.
|
|
*
|
|
* @param pFile Path and file name of the file to be examined.
|
|
* @param pIOHandler The IO handler to use for accessing any file.
|
|
* @param checkSig Set to true if this method is called a second time.
|
|
* This time, the implementation may take more time to examine the
|
|
* contents of the file to be loaded for magic bytes, keywords, etc
|
|
* to be able to load files with unknown/not existent file extensions.
|
|
* @return true if the class can read this file, false if not.
|
|
*/
|
|
virtual bool CanRead(
|
|
const std::string& pFile,
|
|
IOSystem* pIOHandler,
|
|
bool checkSig
|
|
) const = 0;
|
|
|
|
// -------------------------------------------------------------------
|
|
/** Imports the given file and returns the imported data.
|
|
* If the import succeeds, ownership of the data is transferred to
|
|
* the caller. If the import fails, NULL is returned. The function
|
|
* takes care that any partially constructed data is destroyed
|
|
* beforehand.
|
|
*
|
|
* @param pImp #Importer object hosting this loader.
|
|
* @param pFile Path of the file to be imported.
|
|
* @param pIOHandler IO-Handler used to open this and possible other files.
|
|
* @return The imported data or NULL if failed. If it failed a
|
|
* human-readable error description can be retrieved by calling
|
|
* GetErrorText()
|
|
*
|
|
* @note This function is not intended to be overridden. Implement
|
|
* InternReadFile() to do the import. If an exception is thrown somewhere
|
|
* in InternReadFile(), this function will catch it and transform it into
|
|
* a suitable response to the caller.
|
|
*/
|
|
aiScene* ReadFile(
|
|
const Importer* pImp,
|
|
const std::string& pFile,
|
|
IOSystem* pIOHandler
|
|
);
|
|
|
|
// -------------------------------------------------------------------
|
|
/** Returns the error description of the last error that occured.
|
|
* @return A description of the last error that occured. An empty
|
|
* string if there was no error.
|
|
*/
|
|
const std::string& GetErrorText() const {
|
|
return mErrorText;
|
|
}
|
|
|
|
// -------------------------------------------------------------------
|
|
/** Called prior to ReadFile().
|
|
* The function is a request to the importer to update its configuration
|
|
* basing on the Importer's configuration property list.
|
|
* @param pImp Importer instance
|
|
*/
|
|
virtual void SetupProperties(
|
|
const Importer* pImp
|
|
);
|
|
|
|
|
|
// -------------------------------------------------------------------
|
|
/** Called by #Importer::GetImporterInfo to get a description of
|
|
* some loader features. Importers must provide this information. */
|
|
virtual const aiImporterDesc* GetInfo() const = 0;
|
|
|
|
|
|
|
|
// -------------------------------------------------------------------
|
|
/** Called by #Importer::GetExtensionList for each loaded importer.
|
|
* Take the extension list contained in the structure returned by
|
|
* #GetInfo and insert all file extensions into the given set.
|
|
* @param extension set to collect file extensions in*/
|
|
void GetExtensionList(std::set<std::string>& extensions);
|
|
|
|
protected:
|
|
|
|
// -------------------------------------------------------------------
|
|
/** Imports the given file into the given scene structure. The
|
|
* function is expected to throw an ImportErrorException if there is
|
|
* an error. If it terminates normally, the data in aiScene is
|
|
* expected to be correct. Override this function to implement the
|
|
* actual importing.
|
|
* <br>
|
|
* The output scene must meet the following requirements:<br>
|
|
* <ul>
|
|
* <li>At least a root node must be there, even if its only purpose
|
|
* is to reference one mesh.</li>
|
|
* <li>aiMesh::mPrimitiveTypes may be 0. The types of primitives
|
|
* in the mesh are determined automatically in this case.</li>
|
|
* <li>the vertex data is stored in a pseudo-indexed "verbose" format.
|
|
* In fact this means that every vertex that is referenced by
|
|
* a face is unique. Or the other way round: a vertex index may
|
|
* not occur twice in a single aiMesh.</li>
|
|
* <li>aiAnimation::mDuration may be -1. Assimp determines the length
|
|
* of the animation automatically in this case as the length of
|
|
* the longest animation channel.</li>
|
|
* <li>aiMesh::mBitangents may be NULL if tangents and normals are
|
|
* given. In this case bitangents are computed as the cross product
|
|
* between normal and tangent.</li>
|
|
* <li>There needn't be a material. If none is there a default material
|
|
* is generated. However, it is recommended practice for loaders
|
|
* to generate a default material for yourself that matches the
|
|
* default material setting for the file format better than Assimp's
|
|
* generic default material. Note that default materials *should*
|
|
* be named AI_DEFAULT_MATERIAL_NAME if they're just color-shaded
|
|
* or AI_DEFAULT_TEXTURED_MATERIAL_NAME if they define a (dummy)
|
|
* texture. </li>
|
|
* </ul>
|
|
* If the AI_SCENE_FLAGS_INCOMPLETE-Flag is <b>not</b> set:<ul>
|
|
* <li> at least one mesh must be there</li>
|
|
* <li> there may be no meshes with 0 vertices or faces</li>
|
|
* </ul>
|
|
* This won't be checked (except by the validation step): Assimp will
|
|
* crash if one of the conditions is not met!
|
|
*
|
|
* @param pFile Path of the file to be imported.
|
|
* @param pScene The scene object to hold the imported data.
|
|
* NULL is not a valid parameter.
|
|
* @param pIOHandler The IO handler to use for any file access.
|
|
* NULL is not a valid parameter. */
|
|
virtual void InternReadFile(
|
|
const std::string& pFile,
|
|
aiScene* pScene,
|
|
IOSystem* pIOHandler
|
|
) = 0;
|
|
|
|
public: // static utilities
|
|
|
|
// -------------------------------------------------------------------
|
|
/** A utility for CanRead().
|
|
*
|
|
* The function searches the header of a file for a specific token
|
|
* and returns true if this token is found. This works for text
|
|
* files only. There is a rudimentary handling of UNICODE files.
|
|
* The comparison is case independent.
|
|
*
|
|
* @param pIOSystem IO System to work with
|
|
* @param file File name of the file
|
|
* @param tokens List of tokens to search for
|
|
* @param numTokens Size of the token array
|
|
* @param searchBytes Number of bytes to be searched for the tokens.
|
|
*/
|
|
static bool SearchFileHeaderForToken(
|
|
IOSystem* pIOSystem,
|
|
const std::string& file,
|
|
const char** tokens,
|
|
unsigned int numTokens,
|
|
unsigned int searchBytes = 200,
|
|
bool tokensSol = false);
|
|
|
|
// -------------------------------------------------------------------
|
|
/** @brief Check whether a file has a specific file extension
|
|
* @param pFile Input file
|
|
* @param ext0 Extension to check for. Lowercase characters only, no dot!
|
|
* @param ext1 Optional second extension
|
|
* @param ext2 Optional third extension
|
|
* @note Case-insensitive
|
|
*/
|
|
static bool SimpleExtensionCheck (
|
|
const std::string& pFile,
|
|
const char* ext0,
|
|
const char* ext1 = NULL,
|
|
const char* ext2 = NULL);
|
|
|
|
// -------------------------------------------------------------------
|
|
/** @brief Extract file extension from a string
|
|
* @param pFile Input file
|
|
* @return Extension without trailing dot, all lowercase
|
|
*/
|
|
static std::string GetExtension (
|
|
const std::string& pFile);
|
|
|
|
// -------------------------------------------------------------------
|
|
/** @brief Extract folder of the file from a string
|
|
* @param pFile Input file
|
|
* @param osSeparator Directory Separator of the current OS
|
|
* @return path to the files folder
|
|
* @note catch the osSeparator from a IOSystem
|
|
*/
|
|
static std::string GetFolderPath(
|
|
const std::string& pFile,
|
|
const char& osSeparator);
|
|
|
|
// -------------------------------------------------------------------
|
|
/** @brief Check whether a file starts with one or more magic tokens
|
|
* @param pFile Input file
|
|
* @param pIOHandler IO system to be used
|
|
* @param magic n magic tokens
|
|
* @params num Size of magic
|
|
* @param offset Offset from file start where tokens are located
|
|
* @param Size of one token, in bytes. Maximally 16 bytes.
|
|
* @return true if one of the given tokens was found
|
|
*
|
|
* @note For convinence, the check is also performed for the
|
|
* byte-swapped variant of all tokens (big endian). Only for
|
|
* tokens of size 2,4.
|
|
*/
|
|
static bool CheckMagicToken(
|
|
IOSystem* pIOHandler,
|
|
const std::string& pFile,
|
|
const void* magic,
|
|
unsigned int num,
|
|
unsigned int offset = 0,
|
|
unsigned int size = 4);
|
|
|
|
// -------------------------------------------------------------------
|
|
/** An utility for all text file loaders. It converts a file to our
|
|
* UTF8 character set. Errors are reported, but ignored.
|
|
*
|
|
* @param data File buffer to be converted to UTF8 data. The buffer
|
|
* is resized as appropriate. */
|
|
static void ConvertToUTF8(
|
|
std::vector<char>& data);
|
|
|
|
// -------------------------------------------------------------------
|
|
/** Utility for text file loaders which copies the contents of the
|
|
* file into a memory buffer and converts it to our UTF8
|
|
* representation.
|
|
* @param stream Stream to read from.
|
|
* @param data Output buffer to be resized and filled with the
|
|
* converted text file data. The buffer is terminated with
|
|
* a binary 0. */
|
|
static void TextFileToBuffer(
|
|
IOStream* stream,
|
|
std::vector<char>& data);
|
|
|
|
protected:
|
|
|
|
/** Error description in case there was one. */
|
|
std::string mErrorText;
|
|
|
|
/** Currently set progress handler */
|
|
ProgressHandler* progress;
|
|
};
|
|
|
|
|
|
|
|
} // end of namespace Assimp
|
|
|
|
#endif // AI_BASEIMPORTER_H_INC
|