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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2022, 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  OptimizeGraph.cpp
+ *  @brief Implementation of the aiProcess_OptimizGraph step
+ */
+
+#ifndef ASSIMP_BUILD_NO_OPTIMIZEGRAPH_PROCESS
+
+#include "OptimizeGraph.h"
+#include "ProcessHelper.h"
+#include "ConvertToLHProcess.h"
+#include <assimp/Exceptional.h>
+#include <assimp/SceneCombiner.h>
+#include <stdio.h>
+
+using namespace Assimp;
+
+#define AI_RESERVED_NODE_NAME "$Reserved_And_Evil"
+
+/* AI_OG_USE_HASHING enables the use of hashing to speed-up std::set lookups.
+ * The unhashed variant should be faster, except for *very* large data sets
+ */
+#ifdef AI_OG_USE_HASHING
+// Use our standard hashing function to compute the hash
+#define AI_OG_GETKEY(str) SuperFastHash(str.data, str.length)
+#else
+// Otherwise hope that std::string will utilize a static buffer
+// for shorter node names. This would avoid endless heap copying.
+#define AI_OG_GETKEY(str) std::string(str.data)
+#endif
+
+// ------------------------------------------------------------------------------------------------
+// Constructor to be privately used by Importer
+OptimizeGraphProcess::OptimizeGraphProcess() :
+		mScene(),
+		nodes_in(),
+		nodes_out(),
+		count_merged() {
+	// empty
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+OptimizeGraphProcess::~OptimizeGraphProcess() {
+	// empty
+}
+
+// ------------------------------------------------------------------------------------------------
+// Returns whether the processing step is present in the given flag field.
+bool OptimizeGraphProcess::IsActive(unsigned int pFlags) const {
+	return (0 != (pFlags & aiProcess_OptimizeGraph));
+}
+
+// ------------------------------------------------------------------------------------------------
+// Setup properties for the post-processing step
+void OptimizeGraphProcess::SetupProperties(const Importer *pImp) {
+	// Get value of AI_CONFIG_PP_OG_EXCLUDE_LIST
+	std::string tmp = pImp->GetPropertyString(AI_CONFIG_PP_OG_EXCLUDE_LIST, "");
+	AddLockedNodeList(tmp);
+}
+
+// ------------------------------------------------------------------------------------------------
+// Collect new children
+void OptimizeGraphProcess::CollectNewChildren(aiNode *nd, std::list<aiNode *> &nodes) {
+	nodes_in += nd->mNumChildren;
+
+	// Process children
+	std::list<aiNode *> child_nodes;
+	for (unsigned int i = 0; i < nd->mNumChildren; ++i) {
+		CollectNewChildren(nd->mChildren[i], child_nodes);
+		nd->mChildren[i] = nullptr;
+	}
+
+	// Check whether we need this node; if not we can replace it by our own children (warn, danger of incest).
+	if (locked.find(AI_OG_GETKEY(nd->mName)) == locked.end()) {
+		for (std::list<aiNode *>::iterator it = child_nodes.begin(); it != child_nodes.end();) {
+
+			if (locked.find(AI_OG_GETKEY((*it)->mName)) == locked.end()) {
+				(*it)->mTransformation = nd->mTransformation * (*it)->mTransformation;
+				nodes.push_back(*it);
+
+				it = child_nodes.erase(it);
+				continue;
+			}
+			++it;
+		}
+
+		if (nd->mNumMeshes || !child_nodes.empty()) {
+			nodes.push_back(nd);
+		} else {
+			delete nd; /* bye, node */
+			return;
+		}
+	} else {
+
+		// Retain our current position in the hierarchy
+		nodes.push_back(nd);
+
+		// Now check for possible optimizations in our list of child nodes. join as many as possible
+		aiNode *join_master = nullptr;
+		aiMatrix4x4 inv;
+
+		const LockedSetType::const_iterator end = locked.end();
+
+		std::list<aiNode *> join;
+		for (std::list<aiNode *>::iterator it = child_nodes.begin(); it != child_nodes.end();) {
+			aiNode *child = *it;
+			if (child->mNumChildren == 0 && locked.find(AI_OG_GETKEY(child->mName)) == end) {
+
+				// There may be no instanced meshes
+				unsigned int n = 0;
+				for (; n < child->mNumMeshes; ++n) {
+					if (meshes[child->mMeshes[n]] > 1) {
+						break;
+					}
+				}
+				if (n == child->mNumMeshes) {
+					if (!join_master) {
+						join_master = child;
+						inv = join_master->mTransformation;
+						inv.Inverse();
+					} else {
+						child->mTransformation = inv * child->mTransformation;
+
+						join.push_back(child);
+						it = child_nodes.erase(it);
+						continue;
+					}
+				}
+			}
+			++it;
+		}
+		if (join_master && !join.empty()) {
+			join_master->mName.length = ::ai_snprintf(join_master->mName.data, MAXLEN, "$MergedNode_%u", count_merged++);
+
+			unsigned int out_meshes = 0;
+			for (std::list<aiNode *>::const_iterator it = join.cbegin(); it != join.cend(); ++it) {
+				out_meshes += (*it)->mNumMeshes;
+			}
+
+			// copy all mesh references in one array
+			if (out_meshes) {
+				unsigned int *meshIdxs = new unsigned int[out_meshes + join_master->mNumMeshes], *tmp = meshIdxs;
+				for (unsigned int n = 0; n < join_master->mNumMeshes; ++n) {
+					*tmp++ = join_master->mMeshes[n];
+				}
+
+				for (const aiNode *join_node : join) {
+					for (unsigned int n = 0; n < join_node->mNumMeshes; ++n) {
+
+						*tmp = join_node->mMeshes[n];
+						aiMesh *mesh = mScene->mMeshes[*tmp++];
+
+						// Assume the transformation is affine
+						// manually move the mesh into the right coordinate system
+
+						// Check for odd negative scale (mirror)
+						if (join_node->mTransformation.Determinant() < 0) {
+							// Reverse the mesh face winding order
+                            FlipWindingOrderProcess::ProcessMesh(mesh);
+						}
+
+                        // Update positions, normals and tangents
+						const aiMatrix3x3 IT = aiMatrix3x3(join_node->mTransformation).Inverse().Transpose();
+						for (unsigned int a = 0; a < mesh->mNumVertices; ++a) {
+
+							mesh->mVertices[a] *= join_node->mTransformation;
+
+							if (mesh->HasNormals())
+								mesh->mNormals[a] *= IT;
+
+							if (mesh->HasTangentsAndBitangents()) {
+								mesh->mTangents[a] *= IT;
+								mesh->mBitangents[a] *= IT;
+							}
+						}
+					}
+					delete join_node; // bye, node
+				}
+				delete[] join_master->mMeshes;
+				join_master->mMeshes = meshIdxs;
+				join_master->mNumMeshes += out_meshes;
+			}
+		}
+	}
+	// reassign children if something changed
+	if (child_nodes.empty() || child_nodes.size() > nd->mNumChildren) {
+
+		delete[] nd->mChildren;
+
+		if (!child_nodes.empty()) {
+			nd->mChildren = new aiNode *[child_nodes.size()];
+		} else
+			nd->mChildren = nullptr;
+	}
+
+	nd->mNumChildren = static_cast<unsigned int>(child_nodes.size());
+
+	if (nd->mChildren) {
+		aiNode **tmp = nd->mChildren;
+		for (std::list<aiNode *>::iterator it = child_nodes.begin(); it != child_nodes.end(); ++it) {
+			aiNode *node = *tmp++ = *it;
+			node->mParent = nd;
+		}
+	}
+
+	nodes_out += static_cast<unsigned int>(child_nodes.size());
+}
+
+// ------------------------------------------------------------------------------------------------
+// Execute the post-processing step on the given scene
+void OptimizeGraphProcess::Execute(aiScene *pScene) {
+	ASSIMP_LOG_DEBUG("OptimizeGraphProcess begin");
+	nodes_in = nodes_out = count_merged = 0;
+	mScene = pScene;
+
+	meshes.resize(pScene->mNumMeshes, 0);
+	FindInstancedMeshes(pScene->mRootNode);
+
+	// build a blacklist of identifiers. If the name of a node matches one of these, we won't touch it
+	locked.clear();
+	for (std::list<std::string>::const_iterator it = locked_nodes.begin(); it != locked_nodes.end(); ++it) {
+#ifdef AI_OG_USE_HASHING
+		locked.insert(SuperFastHash((*it).c_str()));
+#else
+		locked.insert(*it);
+#endif
+	}
+
+	for (unsigned int i = 0; i < pScene->mNumAnimations; ++i) {
+		for (unsigned int a = 0; a < pScene->mAnimations[i]->mNumChannels; ++a) {
+			aiNodeAnim *anim = pScene->mAnimations[i]->mChannels[a];
+			locked.insert(AI_OG_GETKEY(anim->mNodeName));
+		}
+	}
+
+	for (unsigned int i = 0; i < pScene->mNumMeshes; ++i) {
+		for (unsigned int a = 0; a < pScene->mMeshes[i]->mNumBones; ++a) {
+
+			aiBone *bone = pScene->mMeshes[i]->mBones[a];
+			locked.insert(AI_OG_GETKEY(bone->mName));
+
+			// HACK: Meshes referencing bones may not be transformed; we need to look them.
+			// The easiest way to do this is to increase their reference counters ...
+			meshes[i] += 2;
+		}
+	}
+
+	for (unsigned int i = 0; i < pScene->mNumCameras; ++i) {
+		aiCamera *cam = pScene->mCameras[i];
+		locked.insert(AI_OG_GETKEY(cam->mName));
+	}
+
+	for (unsigned int i = 0; i < pScene->mNumLights; ++i) {
+		aiLight *lgh = pScene->mLights[i];
+		locked.insert(AI_OG_GETKEY(lgh->mName));
+	}
+
+	// Insert a dummy master node and make it read-only
+	aiNode *dummy_root = new aiNode(AI_RESERVED_NODE_NAME);
+	locked.insert(AI_OG_GETKEY(dummy_root->mName));
+
+	const aiString prev = pScene->mRootNode->mName;
+	pScene->mRootNode->mParent = dummy_root;
+
+	dummy_root->mChildren = new aiNode *[dummy_root->mNumChildren = 1];
+	dummy_root->mChildren[0] = pScene->mRootNode;
+
+	// Do our recursive processing of scenegraph nodes. For each node collect
+	// a fully new list of children and allow their children to place themselves
+	// on the same hierarchy layer as their parents.
+	std::list<aiNode *> nodes;
+	CollectNewChildren(dummy_root, nodes);
+
+	ai_assert(nodes.size() == 1);
+
+	if (dummy_root->mNumChildren == 0) {
+		pScene->mRootNode = nullptr;
+		throw DeadlyImportError("After optimizing the scene graph, no data remains");
+	}
+
+	if (dummy_root->mNumChildren > 1) {
+		pScene->mRootNode = dummy_root;
+
+		// Keep the dummy node but assign the name of the old root node to it
+		pScene->mRootNode->mName = prev;
+	} else {
+
+		// Remove the dummy root node again.
+		pScene->mRootNode = dummy_root->mChildren[0];
+
+		dummy_root->mChildren[0] = nullptr;
+		delete dummy_root;
+	}
+
+	pScene->mRootNode->mParent = nullptr;
+	if (!DefaultLogger::isNullLogger()) {
+		if (nodes_in != nodes_out) {
+			ASSIMP_LOG_INFO("OptimizeGraphProcess finished; Input nodes: ", nodes_in, ", Output nodes: ", nodes_out);
+		} else {
+			ASSIMP_LOG_DEBUG("OptimizeGraphProcess finished");
+		}
+	}
+	meshes.clear();
+	locked.clear();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Build a LUT of all instanced meshes
+void OptimizeGraphProcess::FindInstancedMeshes(aiNode *pNode) {
+	for (unsigned int i = 0; i < pNode->mNumMeshes; ++i) {
+		++meshes[pNode->mMeshes[i]];
+	}
+
+	for (unsigned int i = 0; i < pNode->mNumChildren; ++i)
+		FindInstancedMeshes(pNode->mChildren[i]);
+}
+
+#endif // !! ASSIMP_BUILD_NO_OPTIMIZEGRAPH_PROCESS