assimp/code/SceneCombiner.h

/*
Open Asset Import Library (ASSIMP)
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  following disclaimer.

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*/

/** @file Declares a helper class, "SceneCombiner" providing various
 *  utilities to merge scenes.
 */
#ifndef AI_SCENE_COMBINER_H_INC
#define AI_SCENE_COMBINER_H_INC

#include "../include/aiAssert.h"

namespace Assimp	{

// ---------------------------------------------------------------------------
/** \brief Helper data structure for SceneCombiner.
 *
 *  Describes to which node a scene must be attached to.
 */
struct AttachmentInfo
{
	AttachmentInfo()
		:	scene			(NULL)
		,	attachToNode	(NULL)
	{}

	AttachmentInfo(aiScene* _scene, aiNode* _attachToNode)
		:	scene			(_scene)
		,	attachToNode	(_attachToNode)
	{}

	aiScene* scene;
	aiNode*  attachToNode;
};

// ---------------------------------------------------------------------------
/** \brief Static helper class providing various utilities to merge two
 *    scenes. It is intended as internal utility and NOT for use by 
 *    applications.
 * 
 * The class is currently being used by various postprocessing steps
 * and loaders (ie. LWS).
 */
class ASSIMP_API SceneCombiner
{
	// class cannot be instanced
	SceneCombiner() {}

public:

	// -------------------------------------------------------------------
	/** Merges two or more scenes.
	 *
	 *  @param dest Destination scene. Must be empty.
	 *  @param src Non-empty list of scenes to be merged. The function
	 *    deletes the input scenes afterwards.
	 *  @param flags Combination of the AI_INT_MERGE_SCENE flags defined above
	 */
	static void MergeScenes(aiScene* dest,std::vector<aiScene*>& src,
		unsigned int flags = 0);


	// -------------------------------------------------------------------
	/** Merges two or more scenes and attaches all sceenes to a specific
	 *  position in the node graph of the masteer scene.
	 *
	 *  @param dest Destination scene. Must be empty.
	 *  @param master Master scene. It will be deleted afterwards. All 
	 *    other scenes will be inserted in its node graph.
	 *  @param src Non-empty list of scenes to be merged along with their
	 *    corresponding attachment points in the master scene. The function
	 *    deletes the input scenes afterwards.
	 *  @param flags Combination of the AI_INT_MERGE_SCENE flags defined above
	 */
	static void MergeScenes(aiScene* dest, const aiScene* master, 
		std::vector<AttachmentInfo>& src,
		unsigned int flags = 0);


	// -------------------------------------------------------------------
	/** Merges two or more meshes
	 *
	 *  @param dest Destination mesh. Must be empty.
	 *  @param src Non-empty list of meshes to be merged. The function
	 *    deletes the input meshes afterwards.
	 *  @param flags Currently no parameters
	 */
	static void MergeMeshes(aiMesh* dest,std::vector<aiMesh*>& src,
		unsigned int flags);


	// -------------------------------------------------------------------
	/** Add a name prefix to all nodes in a scene.
	 *
	 *  @param Current node. This function is called recursively.
	 *  @param prefix Prefix to be added to all nodes
	 *  @param len STring length
	 */
	static void AddNodePrefixes(aiNode* node, const char* prefix,
		unsigned int len);
};

}

#endif // !! AI_SCENE_COMBINER_H_INC