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 ----------------------------------------------------------------------
 */
 
 /** @file Declares a helper class, "SceneCombiner" providing various
  *  utilities to merge scenes.
  */
 #pragma once
 #ifndef AI_SCENE_COMBINER_H_INC
 #define AI_SCENE_COMBINER_H_INC
 
 #ifdef __GNUC__
 #pragma GCC system_header
 #endif
 
 #include <assimp/ai_assert.h>
 #include <assimp/types.h>
 
 #include <cstddef>
 #include <cstdint>
 #include <list>
 #include <set>
 #include <vector>
 
 struct aiScene;
 struct aiNode;
 struct aiMaterial;
 struct aiTexture;
 struct aiCamera;
 struct aiLight;
 struct aiMetadata;
 struct aiBone;
 struct aiMesh;
 struct aiAnimMesh;
 struct aiAnimation;
 struct aiNodeAnim;
 struct aiMeshMorphAnim;
 
 namespace Assimp {
 
 // ---------------------------------------------------------------------------
 /** \brief Helper data structure for SceneCombiner.
  *
  *  Describes to which node a scene must be attached to.
  */
 struct AttachmentInfo {
     AttachmentInfo() :
             scene(nullptr),
             attachToNode(nullptr) {}
 
     AttachmentInfo(aiScene *_scene, aiNode *_attachToNode) :
             scene(_scene), attachToNode(_attachToNode) {}
 
     aiScene *scene;
     aiNode *attachToNode;
 };
 
 // ---------------------------------------------------------------------------
 struct NodeAttachmentInfo {
     NodeAttachmentInfo() :
             node(nullptr),
             attachToNode(nullptr),
             resolved(false),
             src_idx(SIZE_MAX) {}
 
     NodeAttachmentInfo(aiNode *_scene, aiNode *_attachToNode, size_t idx) :
             node(_scene), attachToNode(_attachToNode), resolved(false), src_idx(idx) {}
 
     aiNode *node;
     aiNode *attachToNode;
     bool resolved;
     size_t src_idx;
 };
 
 // ---------------------------------------------------------------------------
 /** @def AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES
  *  Generate unique names for all named scene items
  */
 #define AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES 0x1
 
 /** @def AI_INT_MERGE_SCENE_GEN_UNIQUE_MATNAMES
  *  Generate unique names for materials, too.
  *  This is not absolutely required to pass the validation.
  */
 #define AI_INT_MERGE_SCENE_GEN_UNIQUE_MATNAMES 0x2
 
 /** @def AI_INT_MERGE_SCENE_DUPLICATES_DEEP_CPY
  * Use deep copies of duplicate scenes
  */
 #define AI_INT_MERGE_SCENE_DUPLICATES_DEEP_CPY 0x4
 
 /** @def AI_INT_MERGE_SCENE_RESOLVE_CROSS_ATTACHMENTS
  * If attachment nodes are not found in the given master scene,
  * search the other imported scenes for them in an any order.
  */
 #define AI_INT_MERGE_SCENE_RESOLVE_CROSS_ATTACHMENTS 0x8
 
 /** @def AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES_IF_NECESSARY
  * Can be combined with AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES.
  * Unique names are generated, but only if this is absolutely
  * required to avoid name conflicts.
  */
 #define AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES_IF_NECESSARY 0x10
 
 typedef std::pair<aiBone *, unsigned int> BoneSrcIndex;
 
 // ---------------------------------------------------------------------------
 /** @brief Helper data structure for SceneCombiner::MergeBones.
  */
 struct BoneWithHash : public std::pair<uint32_t, aiString *> {
     std::vector<BoneSrcIndex> pSrcBones;
 };
 
 // ---------------------------------------------------------------------------
 /** @brief Utility for SceneCombiner
  */
 struct SceneHelper {
     SceneHelper() :
             scene(nullptr),
             idlen(0) {
         id[0] = 0;
     }
 
     explicit SceneHelper(aiScene *_scene) :
             scene(_scene), idlen(0) {
         id[0] = 0;
     }
 
     AI_FORCE_INLINE aiScene *operator->() const {
         return scene;
     }
 
     // scene we're working on
     aiScene *scene;
 
     // prefix to be added to all identifiers in the scene ...
     char id[32];
 
     // and its strlen()
     unsigned int idlen;
 
     // hash table to quickly check whether a name is contained in the scene
     std::set<unsigned int> hashes;
 };
 
 // ---------------------------------------------------------------------------
 /** \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 {
 public:
     // class cannot be instanced
     SceneCombiner() = delete;
     ~SceneCombiner() = delete;
 
     // -------------------------------------------------------------------
     /** Merges two or more scenes.
      *
      *  @param dest  Receives a pointer to the destination scene. If the
      *    pointer doesn't point to nullptr when the function is called, the
      *    existing scene is cleared and refilled.
      *  @param src Non-empty list of scenes to be merged. The function
      *    deletes the input scenes afterwards. There may be duplicate scenes.
      *  @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 scenes to a specific
      *  position in the node graph of the master scene.
      *
      *  @param dest Receives a pointer to the destination scene. If the
      *    pointer doesn't point to nullptr when the function is called, the
      *    existing scene is cleared and refilled.
      *  @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. There may be duplicate scenes.
      *  @param flags Combination of the AI_INT_MERGE_SCENE flags defined above
      */
     static void MergeScenes(aiScene **dest, aiScene *master,
             std::vector<AttachmentInfo> &src,
             unsigned int flags = 0);
 
     // -------------------------------------------------------------------
     /** Merges two or more meshes
      *
      *  The meshes should have equal vertex formats. Only components
      *  that are provided by ALL meshes will be present in the output mesh.
      *  An exception is made for VColors - they are set to black. The
      *  meshes should have the same material indices, too. The output
      *  material index is always the material index of the first mesh.
      *
      *  @param dest Destination mesh. Must be empty.
      *  @param flags Currently no parameters
      *  @param begin First mesh to be processed
      *  @param end Points to the mesh after the last mesh to be processed
      */
     static void MergeMeshes(aiMesh **dest, unsigned int flags,
             std::vector<aiMesh *>::const_iterator begin,
             std::vector<aiMesh *>::const_iterator end);
 
     // -------------------------------------------------------------------
     /** Merges two or more bones
      *
      *  @param out Mesh to receive the output bone list
      *  @param flags Currently no parameters
      *  @param begin First mesh to be processed
      *  @param end Points to the mesh after the last mesh to be processed
      */
     static void MergeBones(aiMesh *out, std::vector<aiMesh *>::const_iterator it,
             std::vector<aiMesh *>::const_iterator end);
 
     // -------------------------------------------------------------------
     /** Merges two or more materials
      *
      *  The materials should be complementary as much as possible. In case
      *  of a property present in different materials, the first occurrence
      *  is used.
      *
      *  @param dest Destination material. Must be empty.
      *  @param begin First material to be processed
      *  @param end Points to the material after the last material to be processed
      */
     static void MergeMaterials(aiMaterial **dest,
             std::vector<aiMaterial *>::const_iterator begin,
             std::vector<aiMaterial *>::const_iterator end);
 
     // -------------------------------------------------------------------
     /** Builds a list of uniquely named bones in a mesh list
      *
      *  @param asBones Receives the output list
      *  @param it      First mesh to be processed
      *  @param end     Last mesh to be processed
      */
     static void BuildUniqueBoneList(std::list<BoneWithHash> &asBones,
             std::vector<aiMesh *>::const_iterator it,
             std::vector<aiMesh *>::const_iterator end);
 
     // -------------------------------------------------------------------
     /** Add a name prefix to all nodes in a scene.
      *
      *  @param node   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);
 
     // -------------------------------------------------------------------
     /** Add an offset to all mesh indices in a node graph
      *
      *  @param node   Current node. This function is called recursively.
      *  @param offset Offset to be added to all mesh indices
      */
     static void OffsetNodeMeshIndices(aiNode *node, unsigned int offset);
 
     // -------------------------------------------------------------------
     /** Attach a list of node graphs to well-defined nodes in a master
      *  graph. This is a helper for MergeScenes()
      *
      *  @param master Master scene
      *  @param srcList List of source scenes along with their attachment
      *    points. If an attachment point is nullptr (or does not exist in
      *    the master graph), a scene is attached to the root of the master
      *    graph (as an additional child node)
      *  @duplicates List of duplicates. If elem[n] == n the scene is not
      *    a duplicate. Otherwise, elem[n] links scene n to its first occurrence.
      */
     static void AttachToGraph(aiScene *master,
             std::vector<NodeAttachmentInfo> &srcList);
 
     static void AttachToGraph(aiNode *attach,
             std::vector<NodeAttachmentInfo> &srcList);
 
     // -------------------------------------------------------------------
     /** Get a deep copy of a scene
      *
      *  @param dest     Receives a pointer to the destination scene
      *  @param source   Source scene - remains unmodified.
      *  @param allocate true for allocation a new scene
      */
     static void CopyScene(aiScene **dest, const aiScene *source, bool allocate = true);
 
     // -------------------------------------------------------------------
     /** Get a flat copy of a scene
      *
      *  Only the first hierarchy layer is copied. All pointer members of
      *  aiScene are shared by source and destination scene.  If the
      *    pointer doesn't point to nullptr when the function is called, the
      *    existing scene is cleared and refilled.
      *  @param dest Receives a pointer to the destination scene
      *  @param src Source scene - remains unmodified.
      */
     static void CopySceneFlat(aiScene **dest, const aiScene *source);
 
     // -------------------------------------------------------------------
     /** Get a deep copy of a mesh
      *
      *  @param dest Receives a pointer to the destination mesh
      *  @param src Source mesh - remains unmodified.
      */
     static void Copy(aiMesh **dest, const aiMesh *src);
 
     // similar to Copy():
     static void Copy(aiAnimMesh **dest, const aiAnimMesh *src);
     static void Copy(aiMaterial **dest, const aiMaterial *src);
     static void Copy(aiTexture **dest, const aiTexture *src);
     static void Copy(aiAnimation **dest, const aiAnimation *src);
     static void Copy(aiCamera **dest, const aiCamera *src);
     static void Copy(aiBone **dest, const aiBone *src);
     static void Copy(aiLight **dest, const aiLight *src);
     static void Copy(aiNodeAnim **dest, const aiNodeAnim *src);
     static void Copy(aiMeshMorphAnim **dest, const aiMeshMorphAnim *src);
     static void Copy(aiMetadata **dest, const aiMetadata *src);
     static void Copy(aiString **dest, const aiString *src);
 
     // recursive, of course
     static void Copy(aiNode **dest, const aiNode *src);
 
 private:
     // -------------------------------------------------------------------
     // Same as AddNodePrefixes, but with an additional check
     static void AddNodePrefixesChecked(aiNode *node, const char *prefix,
             unsigned int len,
             std::vector<SceneHelper> &input,
             unsigned int cur);
 
     // -------------------------------------------------------------------
     // Add node identifiers to a hashing set
     static void AddNodeHashes(aiNode *node, std::set<unsigned int> &hashes);
 
     // -------------------------------------------------------------------
     // Search for duplicate names
     static bool FindNameMatch(const aiString &name,
             std::vector<SceneHelper> &input, unsigned int cur);
 };
 
 } // namespace Assimp
 
 #endif // !! AI_SCENE_COMBINER_H_INC

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