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

Copyright (c) 2006-2016, 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
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  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

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*/

/** @file  cimport.h
 *  @brief Defines the C-API to the Open Asset Import Library.
 */
#ifndef AI_ASSIMP_H_INC
#define AI_ASSIMP_H_INC
#include "types.h"
#include "importerdesc.h"

#ifdef __cplusplus
extern "C" {
#endif

struct aiScene;  // aiScene.h
struct aiFileIO; // aiFileIO.h
typedef void (*aiLogStreamCallback)(const char* /* message */, char* /* user */);

// --------------------------------------------------------------------------------
/** C-API: Represents a log stream. A log stream receives all log messages and
 *  streams them _somewhere_.
 *  @see aiGetPredefinedLogStream
 *  @see aiAttachLogStream
 *  @see aiDetachLogStream */
// --------------------------------------------------------------------------------
struct aiLogStream
{
    /** callback to be called */
    aiLogStreamCallback callback;

    /** user data to be passed to the callback */
    char* user;
};


// --------------------------------------------------------------------------------
/** C-API: Represents an opaque set of settings to be used during importing.
 *  @see aiCreatePropertyStore
 *  @see aiReleasePropertyStore
 *  @see aiImportFileExWithProperties
 *  @see aiSetPropertyInteger
 *  @see aiSetPropertyFloat
 *  @see aiSetPropertyString
 *  @see aiSetPropertyMatrix
 */
// --------------------------------------------------------------------------------
struct aiPropertyStore { char sentinel; };

/** Our own C boolean type */
typedef int aiBool;

#define AI_FALSE 0
#define AI_TRUE 1

// --------------------------------------------------------------------------------
/** Reads the given file and returns its content.
 *
 * If the call succeeds, the imported data is returned in an aiScene structure.
 * The data is intended to be read-only, it stays property of the ASSIMP
 * library and will be stable until aiReleaseImport() is called. After you're
 * done with it, call aiReleaseImport() to free the resources associated with
 * this file. If the import fails, NULL is returned instead. Call
 * aiGetErrorString() to retrieve a human-readable error text.
 * @param pFile Path and filename of the file to be imported,
 *   expected to be a null-terminated c-string. NULL is not a valid value.
 * @param pFlags Optional post processing steps to be executed after
 *   a successful import. Provide a bitwise combination of the
 *   #aiPostProcessSteps flags.
 * @return Pointer to the imported data or NULL if the import failed.
 */
ASSIMP_API const C_STRUCT aiScene* aiImportFile(
    const char* pFile,
    unsigned int pFlags);

// --------------------------------------------------------------------------------
/** Reads the given file using user-defined I/O functions and returns
 *   its content.
 *
 * If the call succeeds, the imported data is returned in an aiScene structure.
 * The data is intended to be read-only, it stays property of the ASSIMP
 * library and will be stable until aiReleaseImport() is called. After you're
 * done with it, call aiReleaseImport() to free the resources associated with
 * this file. If the import fails, NULL is returned instead. Call
 * aiGetErrorString() to retrieve a human-readable error text.
 * @param pFile Path and filename of the file to be imported,
 *   expected to be a null-terminated c-string. NULL is not a valid value.
 * @param pFlags Optional post processing steps to be executed after
 *   a successful import. Provide a bitwise combination of the
 *   #aiPostProcessSteps flags.
 * @param pFS aiFileIO structure. Will be used to open the model file itself
 *   and any other files the loader needs to open.  Pass NULL to use the default
 *   implementation.
 * @return Pointer to the imported data or NULL if the import failed.
 * @note Include <aiFileIO.h> for the definition of #aiFileIO.
 */
ASSIMP_API const C_STRUCT aiScene* aiImportFileEx(
    const char* pFile,
    unsigned int pFlags,
    C_STRUCT aiFileIO* pFS);

// --------------------------------------------------------------------------------
/** Same as #aiImportFileEx, but adds an extra parameter containing importer settings.
 *
 * @param pFile Path and filename of the file to be imported,
 *   expected to be a null-terminated c-string. NULL is not a valid value.
 * @param pFlags Optional post processing steps to be executed after
 *   a successful import. Provide a bitwise combination of the
 *   #aiPostProcessSteps flags.
 * @param pFS aiFileIO structure. Will be used to open the model file itself
 *   and any other files the loader needs to open.  Pass NULL to use the default
 *   implementation.
 * @param pProps #aiPropertyStore instance containing import settings.
 * @return Pointer to the imported data or NULL if the import failed.
 * @note Include <aiFileIO.h> for the definition of #aiFileIO.
 * @see aiImportFileEx
 */
ASSIMP_API const C_STRUCT aiScene* aiImportFileExWithProperties(
    const char* pFile,
    unsigned int pFlags,
    C_STRUCT aiFileIO* pFS,
    const C_STRUCT aiPropertyStore* pProps);

// --------------------------------------------------------------------------------
/** Reads the given file from a given memory buffer,
 *
 * 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 keeps
 * ownership of the data and will destroy it upon destruction. If the import fails,
 * NULL is returned.
 * A human-readable error description can be retrieved by calling aiGetErrorString().
 * @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 #aiApplyPostProcessing().
 * @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, NULL if the import failed.
 *
 * @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 aiImportFileEx()/aiImportFileExWithProperties() API.
 */
ASSIMP_API const C_STRUCT aiScene* aiImportFileFromMemory(
    const char* pBuffer,
    unsigned int pLength,
    unsigned int pFlags,
    const char* pHint);

// --------------------------------------------------------------------------------
/** Same as #aiImportFileFromMemory, but adds an extra parameter containing importer settings.
 *
 * @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 #aiApplyPostProcessing().
 * @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 ...
 * @param pProps #aiPropertyStore instance containing import settings.
 * @return A pointer to the imported data, NULL if the import failed.
 *
 * @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 aiImportFileEx()/aiImportFileExWithProperties() API.
 * @see aiImportFileFromMemory
 */
ASSIMP_API const C_STRUCT aiScene* aiImportFileFromMemoryWithProperties(
    const char* pBuffer,
    unsigned int pLength,
    unsigned int pFlags,
    const char* pHint,
    const C_STRUCT aiPropertyStore* pProps);

// --------------------------------------------------------------------------------
/** Apply post-processing to an already-imported scene.
 *
 * This is strictly equivalent to calling #aiImportFile()/#aiImportFileEx 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 pScene Scene to work on.
 * @param pFlags Provide a bitwise combination of the #aiPostProcessSteps flags.
 * @return A pointer to the post-processed data. Post processing is done in-place,
 *   meaning this is still the same #aiScene which you passed for pScene. However,
 *   _if_ post-processing failed, the scene could now be NULL. That's quite a rare
 *   case, post processing steps are not really designed to 'fail'. To be exact,
 *   the #aiProcess_ValidateDataStructure flag is currently the only post processing step
 *   which can actually cause the scene to be reset to NULL.
 */
ASSIMP_API const C_STRUCT aiScene* aiApplyPostProcessing(
    const C_STRUCT aiScene* pScene,
    unsigned int pFlags);

// --------------------------------------------------------------------------------
/** Get one of the predefine log streams. This is the quick'n'easy solution to
 *  access Assimp's log system. Attaching a log stream can slightly reduce Assimp's
 *  overall import performance.
 *
 *  Usage is rather simple (this will stream the log to a file, named log.txt, and
 *  the stdout stream of the process:
 *  @code
 *    struct aiLogStream c;
 *    c = aiGetPredefinedLogStream(aiDefaultLogStream_FILE,"log.txt");
 *    aiAttachLogStream(&c);
 *    c = aiGetPredefinedLogStream(aiDefaultLogStream_STDOUT,NULL);
 *    aiAttachLogStream(&c);
 *  @endcode
 *
 *  @param pStreams One of the #aiDefaultLogStream enumerated values.
 *  @param file Solely for the #aiDefaultLogStream_FILE flag: specifies the file to write to.
 *    Pass NULL for all other flags.
 *  @return The log stream. callback is set to NULL if something went wrong.
 */
ASSIMP_API C_STRUCT aiLogStream aiGetPredefinedLogStream(
    C_ENUM aiDefaultLogStream pStreams,
    const char* file);

// --------------------------------------------------------------------------------
/** Attach a custom log stream to the libraries' logging system.
 *
 *  Attaching a log stream can slightly reduce Assimp's overall import
 *  performance. Multiple log-streams can be attached.
 *  @param stream Describes the new log stream.
 *  @note To ensure proper destruction of the logging system, you need to manually
 *    call aiDetachLogStream() on every single log stream you attach.
 *    Alternatively (for the lazy folks) #aiDetachAllLogStreams is provided.
 */
ASSIMP_API void aiAttachLogStream(
    const C_STRUCT aiLogStream* stream);

// --------------------------------------------------------------------------------
/** Enable verbose logging. Verbose logging includes debug-related stuff and
 *  detailed import statistics. This can have severe impact on import performance
 *  and memory consumption. However, it might be useful to find out why a file
 *  didn't read correctly.
 *  @param d AI_TRUE or AI_FALSE, your decision.
 */
ASSIMP_API void aiEnableVerboseLogging(aiBool d);

// --------------------------------------------------------------------------------
/** Detach a custom log stream from the libraries' logging system.
 *
 *  This is the counterpart of #aiAttachLogStream. If you attached a stream,
 *  don't forget to detach it again.
 *  @param stream The log stream to be detached.
 *  @return AI_SUCCESS if the log stream has been detached successfully.
 *  @see aiDetachAllLogStreams
 */
ASSIMP_API C_ENUM aiReturn aiDetachLogStream(
    const C_STRUCT aiLogStream* stream);

// --------------------------------------------------------------------------------
/** Detach all active log streams from the libraries' logging system.
 *  This ensures that the logging system is terminated properly and all
 *  resources allocated by it are actually freed. If you attached a stream,
 *  don't forget to detach it again.
 *  @see aiAttachLogStream
 *  @see aiDetachLogStream
 */
ASSIMP_API void aiDetachAllLogStreams(void);

// --------------------------------------------------------------------------------
/** Releases all resources associated with the given import process.
 *
 * Call this function after you're done with the imported data.
 * @param pScene The imported data to release. NULL is a valid value.
 */
ASSIMP_API void aiReleaseImport(
    const C_STRUCT aiScene* pScene);

// --------------------------------------------------------------------------------
/** Returns the error text of the last failed import process.
 *
 * @return A textual description of the error that occurred at the last
 * import process. NULL if there was no error. There can't be an error if you
 * got a non-NULL #aiScene from #aiImportFile/#aiImportFileEx/#aiApplyPostProcessing.
 */
ASSIMP_API const char* aiGetErrorString();

// --------------------------------------------------------------------------------
/** Returns whether a given file extension is supported by ASSIMP
 *
 * @param szExtension Extension for which the function queries support for.
 * Must include a leading dot '.'. Example: ".3ds", ".md3"
 * @return AI_TRUE if the file extension is supported.
 */
ASSIMP_API aiBool aiIsExtensionSupported(
    const char* szExtension);

// --------------------------------------------------------------------------------
/** Get a 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.
 * @param szOut String to receive the extension list.
 * Format of the list: "*.3ds;*.obj;*.dae". NULL is not a valid parameter.
 */
ASSIMP_API void aiGetExtensionList(
    C_STRUCT aiString* szOut);

// --------------------------------------------------------------------------------
/** Get the approximated storage required by an imported asset
 * @param pIn Input asset.
 * @param in Data structure to be filled.
 */
ASSIMP_API void aiGetMemoryRequirements(
    const C_STRUCT aiScene* pIn,
    C_STRUCT aiMemoryInfo* in);



// --------------------------------------------------------------------------------
/** Create an empty property store. Property stores are used to collect import
 *  settings.
 * @return New property store. Property stores need to be manually destroyed using
 *   the #aiReleasePropertyStore API function.
 */
ASSIMP_API C_STRUCT aiPropertyStore* aiCreatePropertyStore(void);

// --------------------------------------------------------------------------------
/** Delete a property store.
 * @param p Property store to be deleted.
 */
ASSIMP_API void aiReleasePropertyStore(C_STRUCT aiPropertyStore* p);

// --------------------------------------------------------------------------------
/** Set an integer property.
 *
 *  This is the C-version of #Assimp::Importer::SetPropertyInteger(). In the C
 *  interface, properties are always shared by all imports. It is not possible to
 *  specify them per import.
 *
 * @param store Store to modify. Use #aiCreatePropertyStore to obtain a store.
 * @param szName Name of the configuration property to be set. All supported
 *   public properties are defined in the config.h header file (AI_CONFIG_XXX).
 * @param value New value for the property
 */
ASSIMP_API void aiSetImportPropertyInteger(
    C_STRUCT aiPropertyStore* store,
    const char* szName,
    int value);

// --------------------------------------------------------------------------------
/** Set a floating-point property.
 *
 *  This is the C-version of #Assimp::Importer::SetPropertyFloat(). In the C
 *  interface, properties are always shared by all imports. It is not possible to
 *  specify them per import.
 *
 * @param store Store to modify. Use #aiCreatePropertyStore to obtain a store.
 * @param szName Name of the configuration property to be set. All supported
 *   public properties are defined in the config.h header file (AI_CONFIG_XXX).
 * @param value New value for the property
 */
ASSIMP_API void aiSetImportPropertyFloat(
    C_STRUCT aiPropertyStore* store,
    const char* szName,
    float value);

// --------------------------------------------------------------------------------
/** Set a string property.
 *
 *  This is the C-version of #Assimp::Importer::SetPropertyString(). In the C
 *  interface, properties are always shared by all imports. It is not possible to
 *  specify them per import.
 *
 * @param store Store to modify. Use #aiCreatePropertyStore to obtain a store.
 * @param szName Name of the configuration property to be set. All supported
 *   public properties are defined in the config.h header file (AI_CONFIG_XXX).
 * @param st New value for the property
 */
ASSIMP_API void aiSetImportPropertyString(
    C_STRUCT aiPropertyStore* store,
    const char* szName,
    const C_STRUCT aiString* st);

// --------------------------------------------------------------------------------
/** Set a matrix property.
 *
 *  This is the C-version of #Assimp::Importer::SetPropertyMatrix(). In the C
 *  interface, properties are always shared by all imports. It is not possible to
 *  specify them per import.
 *
 * @param store Store to modify. Use #aiCreatePropertyStore to obtain a store.
 * @param szName Name of the configuration property to be set. All supported
 *   public properties are defined in the config.h header file (AI_CONFIG_XXX).
 * @param mat New value for the property
 */
ASSIMP_API void aiSetImportPropertyMatrix(
    C_STRUCT aiPropertyStore* store,
    const char* szName,
    const C_STRUCT aiMatrix4x4* mat);

// --------------------------------------------------------------------------------
/** Construct a quaternion from a 3x3 rotation matrix.
 *  @param quat Receives the output quaternion.
 *  @param mat Matrix to 'quaternionize'.
 *  @see aiQuaternion(const aiMatrix3x3& pRotMatrix)
 */
ASSIMP_API void aiCreateQuaternionFromMatrix(
    C_STRUCT aiQuaternion* quat,
    const C_STRUCT aiMatrix3x3* mat);

// --------------------------------------------------------------------------------
/** Decompose a transformation matrix into its rotational, translational and
 *  scaling components.
 *
 * @param mat Matrix to decompose
 * @param scaling Receives the scaling component
 * @param rotation Receives the rotational component
 * @param position Receives the translational component.
 * @see aiMatrix4x4::Decompose (aiVector3D&, aiQuaternion&, aiVector3D&) const;
 */
ASSIMP_API void aiDecomposeMatrix(
    const C_STRUCT aiMatrix4x4* mat,
    C_STRUCT aiVector3D* scaling,
    C_STRUCT aiQuaternion* rotation,
    C_STRUCT aiVector3D* position);

// --------------------------------------------------------------------------------
/** Transpose a 4x4 matrix.
 *  @param mat Pointer to the matrix to be transposed
 */
ASSIMP_API void aiTransposeMatrix4(
    C_STRUCT aiMatrix4x4* mat);

// --------------------------------------------------------------------------------
/** Transpose a 3x3 matrix.
 *  @param mat Pointer to the matrix to be transposed
 */
ASSIMP_API void aiTransposeMatrix3(
    C_STRUCT aiMatrix3x3* mat);

// --------------------------------------------------------------------------------
/** Transform a vector by a 3x3 matrix
 *  @param vec Vector to be transformed.
 *  @param mat Matrix to transform the vector with.
 */
ASSIMP_API void aiTransformVecByMatrix3(
    C_STRUCT aiVector3D* vec,
    const C_STRUCT aiMatrix3x3* mat);

// --------------------------------------------------------------------------------
/** Transform a vector by a 4x4 matrix
 *  @param vec Vector to be transformed.
 *  @param mat Matrix to transform the vector with.
 */
ASSIMP_API void aiTransformVecByMatrix4(
    C_STRUCT aiVector3D* vec,
    const C_STRUCT aiMatrix4x4* mat);

// --------------------------------------------------------------------------------
/** Multiply two 4x4 matrices.
 *  @param dst First factor, receives result.
 *  @param src Matrix to be multiplied with 'dst'.
 */
ASSIMP_API void aiMultiplyMatrix4(
    C_STRUCT aiMatrix4x4* dst,
    const C_STRUCT aiMatrix4x4* src);

// --------------------------------------------------------------------------------
/** Multiply two 3x3 matrices.
 *  @param dst First factor, receives result.
 *  @param src Matrix to be multiplied with 'dst'.
 */
ASSIMP_API void aiMultiplyMatrix3(
    C_STRUCT aiMatrix3x3* dst,
    const C_STRUCT aiMatrix3x3* src);

// --------------------------------------------------------------------------------
/** Get a 3x3 identity matrix.
 *  @param mat Matrix to receive its personal identity
 */
ASSIMP_API void aiIdentityMatrix3(
    C_STRUCT aiMatrix3x3* mat);

// --------------------------------------------------------------------------------
/** Get a 4x4 identity matrix.
 *  @param mat Matrix to receive its personal identity
 */
ASSIMP_API void aiIdentityMatrix4(
    C_STRUCT aiMatrix4x4* mat);

// --------------------------------------------------------------------------------
/** Returns the number of import file formats available in the current Assimp build.
 * Use aiGetImportFormatDescription() to retrieve infos of a specific import format.
 */
ASSIMP_API size_t aiGetImportFormatCount(void);

// --------------------------------------------------------------------------------
/** Returns a description of the nth import file format. Use #aiGetImportFormatCount()
 * to learn how many import formats are supported.
 * @param pIndex Index of the import format to retrieve information for. Valid range is
 *    0 to #aiGetImportFormatCount()
 * @return A description of that specific import format. NULL if pIndex is out of range.
 */
ASSIMP_API const C_STRUCT aiImporterDesc* aiGetImportFormatDescription( size_t pIndex);
#ifdef __cplusplus
}
#endif

#endif // AI_ASSIMP_H_INC
