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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.
+
+----------------------------------------------------------------------
+*/
+
+#ifndef AI_PROCESS_HELPER_H_INCLUDED
+#define AI_PROCESS_HELPER_H_INCLUDED
+
+#include <assimp/postprocess.h>
+#include <assimp/anim.h>
+#include <assimp/mesh.h>
+#include <assimp/material.h>
+#include <assimp/DefaultLogger.hpp>
+#include <assimp/scene.h>
+
+#include <assimp/SpatialSort.h>
+#include "BaseProcess.h"
+#include <assimp/ParsingUtils.h>
+
+#include <list>
+
+// -------------------------------------------------------------------------------
+// Some extensions to std namespace. Mainly std::min and std::max for all
+// flat data types in the aiScene. They're used to quickly determine the
+// min/max bounds of data arrays.
+#ifdef __cplusplus
+namespace std {
+
+    // std::min for aiVector3D
+    template <typename TReal>
+    inline ::aiVector3t<TReal> min (const ::aiVector3t<TReal>& a, const ::aiVector3t<TReal>& b) {
+        return ::aiVector3t<TReal> (min(a.x,b.x),min(a.y,b.y),min(a.z,b.z));
+    }
+
+    // std::max for aiVector3t<TReal>
+    template <typename TReal>
+    inline ::aiVector3t<TReal> max (const ::aiVector3t<TReal>& a, const ::aiVector3t<TReal>& b) {
+        return ::aiVector3t<TReal> (max(a.x,b.x),max(a.y,b.y),max(a.z,b.z));
+    }
+
+    // std::min for aiVector2t<TReal>
+    template <typename TReal>
+    inline ::aiVector2t<TReal> min (const ::aiVector2t<TReal>& a, const ::aiVector2t<TReal>& b) {
+        return ::aiVector2t<TReal> (min(a.x,b.x),min(a.y,b.y));
+    }
+
+    // std::max for aiVector2t<TReal>
+    template <typename TReal>
+    inline ::aiVector2t<TReal> max (const ::aiVector2t<TReal>& a, const ::aiVector2t<TReal>& b) {
+        return ::aiVector2t<TReal> (max(a.x,b.x),max(a.y,b.y));
+    }
+
+    // std::min for aiColor4D
+    template <typename TReal>
+    inline ::aiColor4t<TReal> min (const ::aiColor4t<TReal>& a, const ::aiColor4t<TReal>& b)    {
+        return ::aiColor4t<TReal> (min(a.r,b.r),min(a.g,b.g),min(a.b,b.b),min(a.a,b.a));
+    }
+
+    // std::max for aiColor4D
+    template <typename TReal>
+    inline ::aiColor4t<TReal> max (const ::aiColor4t<TReal>& a, const ::aiColor4t<TReal>& b)    {
+        return ::aiColor4t<TReal> (max(a.r,b.r),max(a.g,b.g),max(a.b,b.b),max(a.a,b.a));
+    }
+
+
+    // std::min for aiQuaterniont<TReal>
+    template <typename TReal>
+    inline ::aiQuaterniont<TReal> min (const ::aiQuaterniont<TReal>& a, const ::aiQuaterniont<TReal>& b)    {
+        return ::aiQuaterniont<TReal> (min(a.w,b.w),min(a.x,b.x),min(a.y,b.y),min(a.z,b.z));
+    }
+
+    // std::max for aiQuaterniont<TReal>
+    template <typename TReal>
+    inline ::aiQuaterniont<TReal> max (const ::aiQuaterniont<TReal>& a, const ::aiQuaterniont<TReal>& b)    {
+        return ::aiQuaterniont<TReal> (max(a.w,b.w),max(a.x,b.x),max(a.y,b.y),max(a.z,b.z));
+    }
+
+
+
+    // std::min for aiVectorKey
+    inline ::aiVectorKey min (const ::aiVectorKey& a, const ::aiVectorKey& b)   {
+        return ::aiVectorKey (min(a.mTime,b.mTime),min(a.mValue,b.mValue));
+    }
+
+    // std::max for aiVectorKey
+    inline ::aiVectorKey max (const ::aiVectorKey& a, const ::aiVectorKey& b)   {
+        return ::aiVectorKey (max(a.mTime,b.mTime),max(a.mValue,b.mValue));
+    }
+
+    // std::min for aiQuatKey
+    inline ::aiQuatKey min (const ::aiQuatKey& a, const ::aiQuatKey& b) {
+        return ::aiQuatKey (min(a.mTime,b.mTime),min(a.mValue,b.mValue));
+    }
+
+    // std::max for aiQuatKey
+    inline ::aiQuatKey max (const ::aiQuatKey& a, const ::aiQuatKey& b) {
+        return ::aiQuatKey (max(a.mTime,b.mTime),max(a.mValue,b.mValue));
+    }
+
+    // std::min for aiVertexWeight
+    inline ::aiVertexWeight min (const ::aiVertexWeight& a, const ::aiVertexWeight& b)  {
+        return ::aiVertexWeight (min(a.mVertexId,b.mVertexId),min(a.mWeight,b.mWeight));
+    }
+
+    // std::max for aiVertexWeight
+    inline ::aiVertexWeight max (const ::aiVertexWeight& a, const ::aiVertexWeight& b)  {
+        return ::aiVertexWeight (max(a.mVertexId,b.mVertexId),max(a.mWeight,b.mWeight));
+    }
+
+} // end namespace std
+#endif // !! C++
+
+namespace Assimp {
+
+// -------------------------------------------------------------------------------
+// Start points for ArrayBounds<T> for all supported Ts
+template <typename T>
+struct MinMaxChooser;
+
+template <> struct MinMaxChooser<float> {
+    void operator ()(float& min,float& max) {
+        max = -1e10f;
+        min =  1e10f;
+}};
+template <> struct MinMaxChooser<double> {
+    void operator ()(double& min,double& max) {
+        max = -1e10;
+        min =  1e10;
+}};
+template <> struct MinMaxChooser<unsigned int> {
+    void operator ()(unsigned int& min,unsigned int& max) {
+        max = 0;
+        min = (1u<<(sizeof(unsigned int)*8-1));
+}};
+
+template <typename T> struct MinMaxChooser< aiVector3t<T> > {
+    void operator ()(aiVector3t<T>& min,aiVector3t<T>& max) {
+        max = aiVector3t<T>(-1e10f,-1e10f,-1e10f);
+        min = aiVector3t<T>( 1e10f, 1e10f, 1e10f);
+}};
+template <typename T> struct MinMaxChooser< aiVector2t<T> > {
+    void operator ()(aiVector2t<T>& min,aiVector2t<T>& max) {
+        max = aiVector2t<T>(-1e10f,-1e10f);
+        min = aiVector2t<T>( 1e10f, 1e10f);
+    }};
+template <typename T> struct MinMaxChooser< aiColor4t<T> > {
+    void operator ()(aiColor4t<T>& min,aiColor4t<T>& max) {
+        max = aiColor4t<T>(-1e10f,-1e10f,-1e10f,-1e10f);
+        min = aiColor4t<T>( 1e10f, 1e10f, 1e10f, 1e10f);
+}};
+
+template <typename T> struct MinMaxChooser< aiQuaterniont<T> > {
+    void operator ()(aiQuaterniont<T>& min,aiQuaterniont<T>& max) {
+        max = aiQuaterniont<T>(-1e10f,-1e10f,-1e10f,-1e10f);
+        min = aiQuaterniont<T>( 1e10f, 1e10f, 1e10f, 1e10f);
+}};
+
+template <> struct MinMaxChooser<aiVectorKey> {
+    void operator ()(aiVectorKey& min,aiVectorKey& max) {
+        MinMaxChooser<double>()(min.mTime,max.mTime);
+        MinMaxChooser<aiVector3D>()(min.mValue,max.mValue);
+}};
+template <> struct MinMaxChooser<aiQuatKey> {
+    void operator ()(aiQuatKey& min,aiQuatKey& max) {
+        MinMaxChooser<double>()(min.mTime,max.mTime);
+        MinMaxChooser<aiQuaternion>()(min.mValue,max.mValue);
+}};
+
+template <> struct MinMaxChooser<aiVertexWeight> {
+    void operator ()(aiVertexWeight& min,aiVertexWeight& max) {
+        MinMaxChooser<unsigned int>()(min.mVertexId,max.mVertexId);
+        MinMaxChooser<float>()(min.mWeight,max.mWeight);
+}};
+
+// -------------------------------------------------------------------------------
+/** @brief Find the min/max values of an array of Ts
+ *  @param in Input array
+ *  @param size Number of elements to process
+ *  @param[out] min minimum value
+ *  @param[out] max maximum value
+ */
+template <typename T>
+inline void ArrayBounds(const T* in, unsigned int size, T& min, T& max)
+{
+    MinMaxChooser<T> ()(min,max);
+    for (unsigned int i = 0; i < size;++i) {
+        min = std::min(in[i],min);
+        max = std::max(in[i],max);
+    }
+}
+
+
+// -------------------------------------------------------------------------------
+/** Little helper function to calculate the quadratic difference
+ * of two colours.
+ * @param pColor1 First color
+ * @param pColor2 second color
+ * @return Quadratic color difference */
+inline ai_real GetColorDifference( const aiColor4D& pColor1, const aiColor4D& pColor2)
+{
+    const aiColor4D c (pColor1.r - pColor2.r, pColor1.g - pColor2.g, pColor1.b - pColor2.b, pColor1.a - pColor2.a);
+    return c.r*c.r + c.g*c.g + c.b*c.b + c.a*c.a;
+}
+
+
+// -------------------------------------------------------------------------------
+/** @brief Extract single strings from a list of identifiers
+ *  @param in Input string list.
+ *  @param out Receives a list of clean output strings
+ *  @sdee #AI_CONFIG_PP_OG_EXCLUDE_LIST */
+void ConvertListToStrings(const std::string& in, std::list<std::string>& out);
+
+
+// -------------------------------------------------------------------------------
+/** @brief Compute the AABB of a mesh after applying a given transform
+ *  @param mesh Input mesh
+ *  @param[out] min Receives minimum transformed vertex
+ *  @param[out] max Receives maximum transformed vertex
+ *  @param m Transformation matrix to be applied */
+void FindAABBTransformed (const aiMesh* mesh, aiVector3D& min, aiVector3D& max, const aiMatrix4x4& m);
+
+
+// -------------------------------------------------------------------------------
+/** @brief Helper function to determine the 'real' center of a mesh
+ *
+ *  That is the center of its axis-aligned bounding box.
+ *  @param mesh Input mesh
+ *  @param[out] min Minimum vertex of the mesh
+ *  @param[out] max maximum vertex of the mesh
+ *  @param[out] out Center point */
+void FindMeshCenter (aiMesh* mesh, aiVector3D& out, aiVector3D& min, aiVector3D& max);
+
+// -------------------------------------------------------------------------------
+/** @brief Helper function to determine the 'real' center of a scene
+ *
+ *  That is the center of its axis-aligned bounding box.
+ *  @param scene Input scene
+ *  @param[out] min Minimum vertex of the scene
+ *  @param[out] max maximum vertex of the scene
+ *  @param[out] out Center point */
+void FindSceneCenter (aiScene* scene, aiVector3D& out, aiVector3D& min, aiVector3D& max);
+
+
+// -------------------------------------------------------------------------------
+// Helper function to determine the 'real' center of a mesh after applying a given transform
+void FindMeshCenterTransformed (aiMesh* mesh, aiVector3D& out, aiVector3D& min,aiVector3D& max, const aiMatrix4x4& m);
+
+
+// -------------------------------------------------------------------------------
+// Helper function to determine the 'real' center of a mesh
+void FindMeshCenter (aiMesh* mesh, aiVector3D& out);
+
+
+// -------------------------------------------------------------------------------
+// Helper function to determine the 'real' center of a mesh after applying a given transform
+void FindMeshCenterTransformed (aiMesh* mesh, aiVector3D& out,const aiMatrix4x4& m);
+
+
+// -------------------------------------------------------------------------------
+// Compute a good epsilon value for position comparisons on a mesh
+ai_real ComputePositionEpsilon(const aiMesh* pMesh);
+
+
+// -------------------------------------------------------------------------------
+// Compute a good epsilon value for position comparisons on a array of meshes
+ai_real ComputePositionEpsilon(const aiMesh* const* pMeshes, size_t num);
+
+
+// -------------------------------------------------------------------------------
+// Compute an unique value for the vertex format of a mesh
+unsigned int GetMeshVFormatUnique(const aiMesh* pcMesh);
+
+
+// defs for ComputeVertexBoneWeightTable()
+typedef std::pair <unsigned int,float> PerVertexWeight;
+typedef std::vector <PerVertexWeight> VertexWeightTable;
+
+// -------------------------------------------------------------------------------
+// Compute a per-vertex bone weight table
+VertexWeightTable* ComputeVertexBoneWeightTable(const aiMesh* pMesh);
+
+
+// -------------------------------------------------------------------------------
+// Get a string for a given aiTextureType
+const char* TextureTypeToString(aiTextureType in);
+
+
+// -------------------------------------------------------------------------------
+// Get a string for a given aiTextureMapping
+const char* MappingTypeToString(aiTextureMapping in);
+
+
+// flags for MakeSubmesh()
+#define AI_SUBMESH_FLAGS_SANS_BONES 0x1
+
+// -------------------------------------------------------------------------------
+// Split a mesh given a list of faces to be contained in the sub mesh
+aiMesh* MakeSubmesh(const aiMesh *superMesh, const std::vector<unsigned int> &subMeshFaces, unsigned int subFlags);
+
+// -------------------------------------------------------------------------------
+// Utility postprocess step to share the spatial sort tree between
+// all steps which use it to speedup its computations.
+class ComputeSpatialSortProcess : public BaseProcess
+{
+    bool IsActive( unsigned int pFlags) const
+    {
+        return NULL != shared && 0 != (pFlags & (aiProcess_CalcTangentSpace |
+            aiProcess_GenNormals | aiProcess_JoinIdenticalVertices));
+    }
+
+    void Execute( aiScene* pScene)
+    {
+        typedef std::pair<SpatialSort, ai_real> _Type;
+        ASSIMP_LOG_DEBUG("Generate spatially-sorted vertex cache");
+
+        std::vector<_Type>* p = new std::vector<_Type>(pScene->mNumMeshes);
+        std::vector<_Type>::iterator it = p->begin();
+
+        for (unsigned int i = 0; i < pScene->mNumMeshes; ++i, ++it) {
+            aiMesh* mesh = pScene->mMeshes[i];
+            _Type& blubb = *it;
+            blubb.first.Fill(mesh->mVertices,mesh->mNumVertices,sizeof(aiVector3D));
+            blubb.second = ComputePositionEpsilon(mesh);
+        }
+
+        shared->AddProperty(AI_SPP_SPATIAL_SORT,p);
+    }
+};
+
+// -------------------------------------------------------------------------------
+// ... and the same again to cleanup the whole stuff
+class DestroySpatialSortProcess : public BaseProcess
+{
+    bool IsActive( unsigned int pFlags) const
+    {
+        return NULL != shared && 0 != (pFlags & (aiProcess_CalcTangentSpace |
+            aiProcess_GenNormals | aiProcess_JoinIdenticalVertices));
+    }
+
+    void Execute( aiScene* /*pScene*/)
+    {
+        shared->RemoveProperty(AI_SPP_SPATIAL_SORT);
+    }
+};
+
+
+
+} // ! namespace Assimp
+#endif // !! AI_PROCESS_HELPER_H_INCLUDED