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-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, 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 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 <assimp/Defines.h>
-
-#include <stddef.h>
-#include <set>
-#include <list>
-#include <stdint.h>
-#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 (NULL)
- , attachToNode (NULL)
- {}
-
- AttachmentInfo(aiScene* _scene, aiNode* _attachToNode)
- : scene (_scene)
- , attachToNode (_attachToNode)
- {}
-
- aiScene* scene;
- aiNode* attachToNode;
-};
-
-// ---------------------------------------------------------------------------
-struct NodeAttachmentInfo
-{
- NodeAttachmentInfo()
- : node (NULL)
- , attachToNode (NULL)
- , 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 (NULL)
- , 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 {
- // class cannot be instanced
- SceneCombiner() {
- // empty
- }
-
- ~SceneCombiner() {
- // empty
- }
-
-public:
- // -------------------------------------------------------------------
- /** Merges two or more scenes.
- *
- * @param dest Receives a pointer to the destination scene. If the
- * pointer doesn't point to NULL 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 NULL 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 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 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 NULL (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 src Source scene - remains unmodified.
- */
- 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 NULL 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);
-
- // 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);
-};
-
-}
-
-#endif // !! AI_SCENE_COMBINER_H_INC