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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2017, 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 Defines the helper data structures for importing XFiles */
+#ifndef AI_XFILEHELPER_H_INC
+#define AI_XFILEHELPER_H_INC
+
+#include <string>
+#include <vector>
+#include <stdint.h>
+
+#include <assimp/types.h>
+#include <assimp/quaternion.h>
+#include <assimp/mesh.h>
+#include <assimp/anim.h>
+#include <assimp/Defines.h>
+
+namespace Assimp
+{
+namespace XFile
+{
+
+/** Helper structure representing a XFile mesh face */
+struct Face
+{
+    std::vector<unsigned int> mIndices;
+};
+
+/** Helper structure representing a texture filename inside a material and its potential source */
+struct TexEntry
+{
+    std::string mName;
+    bool mIsNormalMap; // true if the texname was specified in a NormalmapFilename tag
+
+    TexEntry() { mIsNormalMap = false; }
+    TexEntry( const std::string& pName, bool pIsNormalMap = false)
+        : mName( pName), mIsNormalMap( pIsNormalMap)
+    { /* done */ }
+};
+
+/** Helper structure representing a XFile material */
+struct Material
+{
+    std::string mName;
+    bool mIsReference; // if true, mName holds a name by which the actual material can be found in the material list
+    aiColor4D mDiffuse;
+    ai_real mSpecularExponent;
+    aiColor3D mSpecular;
+    aiColor3D mEmissive;
+    std::vector<TexEntry> mTextures;
+
+    size_t sceneIndex; ///< the index under which it was stored in the scene's material list
+
+    Material()
+        : mIsReference(false),
+        mSpecularExponent(),
+        sceneIndex(SIZE_MAX)
+    {}
+};
+
+/** Helper structure to represent a bone weight */
+struct BoneWeight
+{
+    unsigned int mVertex;
+    ai_real mWeight;
+};
+
+/** Helper structure to represent a bone in a mesh */
+struct Bone
+{
+    std::string mName;
+    std::vector<BoneWeight> mWeights;
+    aiMatrix4x4 mOffsetMatrix;
+};
+
+/** Helper structure to represent an XFile mesh */
+struct Mesh
+{
+    std::string mName;
+    std::vector<aiVector3D> mPositions;
+    std::vector<Face> mPosFaces;
+    std::vector<aiVector3D> mNormals;
+    std::vector<Face> mNormFaces;
+    unsigned int mNumTextures;
+    std::vector<aiVector2D> mTexCoords[AI_MAX_NUMBER_OF_TEXTURECOORDS];
+    unsigned int mNumColorSets;
+    std::vector<aiColor4D> mColors[AI_MAX_NUMBER_OF_COLOR_SETS];
+
+    std::vector<unsigned int> mFaceMaterials;
+    std::vector<Material> mMaterials;
+
+    std::vector<Bone> mBones;
+
+    explicit Mesh(const std::string &pName = "") { mName = pName; mNumTextures = 0; mNumColorSets = 0; }
+};
+
+/** Helper structure to represent a XFile frame */
+struct Node
+{
+    std::string mName;
+    aiMatrix4x4 mTrafoMatrix;
+    Node* mParent;
+    std::vector<Node*> mChildren;
+    std::vector<Mesh*> mMeshes;
+
+    Node() { mParent = NULL; }
+    explicit Node( Node* pParent) { mParent = pParent; }
+    ~Node()
+    {
+        for( unsigned int a = 0; a < mChildren.size(); a++)
+            delete mChildren[a];
+        for( unsigned int a = 0; a < mMeshes.size(); a++)
+            delete mMeshes[a];
+    }
+};
+
+struct MatrixKey
+{
+    double mTime;
+    aiMatrix4x4 mMatrix;
+};
+
+/** Helper structure representing a single animated bone in a XFile */
+struct AnimBone
+{
+    std::string mBoneName;
+    std::vector<aiVectorKey> mPosKeys;  // either three separate key sequences for position, rotation, scaling
+    std::vector<aiQuatKey> mRotKeys;
+    std::vector<aiVectorKey> mScaleKeys;
+    std::vector<MatrixKey> mTrafoKeys; // or a combined key sequence of transformation matrices.
+};
+
+/** Helper structure to represent an animation set in a XFile */
+struct Animation
+{
+    std::string mName;
+    std::vector<AnimBone*> mAnims;
+
+    ~Animation()
+    {
+        for( unsigned int a = 0; a < mAnims.size(); a++)
+            delete mAnims[a];
+    }
+};
+
+/** Helper structure analogue to aiScene */
+struct Scene
+{
+    Node* mRootNode;
+
+    std::vector<Mesh*> mGlobalMeshes; // global meshes found outside of any frames
+    std::vector<Material> mGlobalMaterials; // global materials found outside of any meshes.
+
+    std::vector<Animation*> mAnims;
+    unsigned int mAnimTicksPerSecond;
+
+    Scene() { mRootNode = NULL; mAnimTicksPerSecond = 0; }
+    ~Scene()
+    {
+        delete mRootNode;
+        for( unsigned int a = 0; a < mGlobalMeshes.size(); a++)
+            delete mGlobalMeshes[a];
+        for( unsigned int a = 0; a < mAnims.size(); a++)
+            delete mAnims[a];
+    }
+};
+
+} // end of namespace XFile
+} // end of namespace Assimp
+
+#endif // AI_XFILEHELPER_H_INC