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diff --git a/libs/assimp/code/AssetLib/SMD/SMDLoader.h b/libs/assimp/code/AssetLib/SMD/SMDLoader.h
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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  SMDLoader.h
+ *  @brief Definition of the Valve SMD file format
+ */
+
+#pragma once
+#ifndef AI_SMDLOADER_H_INCLUDED
+#define AI_SMDLOADER_H_INCLUDED
+
+#include <assimp/BaseImporter.h>
+#include <assimp/ParsingUtils.h>
+#include <assimp/types.h>
+#include <assimp/texture.h>
+#include <assimp/anim.h>
+#include <assimp/material.h>
+
+#include <vector>
+
+struct aiNode;
+
+namespace Assimp {
+namespace SMD {
+
+// ---------------------------------------------------------------------------
+/** Data structure for a vertex in a SMD file
+*/
+struct Vertex {
+    Vertex() AI_NO_EXCEPT : iParentNode(UINT_MAX) {
+        // empty
+    }
+
+    //! Vertex position, normal and texture coordinate
+    aiVector3D pos,nor,uv;
+
+    //! Vertex parent node
+    unsigned int iParentNode;
+
+    //! Links to bones: pair.first is the bone index,
+    //! pair.second is the vertex weight.
+    //! WARN: The remaining weight (to reach 1.0f) is assigned
+    //! to the parent node/bone
+    std::vector<std::pair<unsigned int, float> > aiBoneLinks;
+};
+
+// ---------------------------------------------------------------------------
+/** Data structure for a face in a SMD file
+*/
+struct Face {
+    Face() AI_NO_EXCEPT :
+            iTexture(0x0), avVertices{} {
+        // empty
+    }
+    
+    //! Texture index for the face
+    unsigned int iTexture;
+
+    //! The three vertices of the face
+    Vertex avVertices[3];
+};
+
+// ---------------------------------------------------------------------------
+/** Data structure for a bone in a SMD file
+*/
+struct Bone {
+    //! Default constructor
+    Bone() AI_NO_EXCEPT : iParent(UINT_MAX), bIsUsed(false) {
+        // empty
+    }
+
+    //! Name of the bone
+    std::string mName;
+
+    //! Parent of the bone
+    uint32_t iParent;
+
+    //! Animation of the bone
+    struct Animation {
+        //! Public default constructor
+        Animation() AI_NO_EXCEPT : iFirstTimeKey() {
+            asKeys.reserve(20);
+        }
+
+        //! Data structure for a matrix key
+        struct MatrixKey {
+            //! Matrix at this time
+            aiMatrix4x4 matrix;
+
+            //! Absolute transformation matrix
+            aiMatrix4x4 matrixAbsolute;
+
+            //! Position
+            aiVector3D vPos;
+
+            //! Rotation (euler angles)
+            aiVector3D vRot;
+
+            //! Current time. may be negative, this
+            //! will be fixed later
+            double dTime;
+        };
+
+        //! Index of the key with the smallest time value
+        uint32_t iFirstTimeKey;
+
+        //! Array of matrix keys
+        std::vector<MatrixKey> asKeys;
+
+    } sAnim;
+
+    //! Offset matrix of the bone
+    aiMatrix4x4 mOffsetMatrix;
+
+    //! true if the bone is referenced by at least one mesh
+    bool bIsUsed;
+};
+
+} //! namespace SMD
+
+// ---------------------------------------------------------------------------
+/** Used to load Half-life 1 and 2 SMD models
+*/
+class ASSIMP_API SMDImporter : public BaseImporter {
+public:
+    SMDImporter();
+    ~SMDImporter() override;
+
+    // -------------------------------------------------------------------
+    /** Returns whether the class can handle the format of the given file.
+     * See BaseImporter::CanRead() for details.
+     */
+    bool CanRead( const std::string& pFile, IOSystem* pIOHandler,
+        bool checkSig) const override;
+
+    // -------------------------------------------------------------------
+    /** Called prior to ReadFile().
+     * The function is a request to the importer to update its configuration
+     * basing on the Importer's configuration property list.
+     */
+    void SetupProperties(const Importer* pImp) override;
+
+protected:
+    // -------------------------------------------------------------------
+    /** Return importer meta information.
+     * See #BaseImporter::GetInfo for the details
+     */
+    const aiImporterDesc* GetInfo () const override;
+
+    // -------------------------------------------------------------------
+    /** Imports the given file into the given scene structure.
+    * See BaseImporter::InternReadFile() for details
+    */
+    void InternReadFile( const std::string& pFile, aiScene* pScene,
+        IOSystem* pIOHandler) override;
+
+    // -------------------------------------------------------------------
+    /** Parse the SMD file and create the output scene
+    */
+    void ParseFile();
+    void ReadSmd(const std::string &pFile, IOSystem* pIOHandler);
+
+    // -------------------------------------------------------------------
+    /** Parse the triangles section of the SMD file
+     * \param szCurrent Current position in the file. Points to the first
+     * data line of the section.
+     * \param szCurrentOut Receives a pointer to the heading line of
+     * the next section (or to EOF)
+    */
+    void ParseTrianglesSection(const char* szCurrent,
+        const char** szCurrentOut);
+
+    // -------------------------------------------------------------------
+    /** Parse the vertex animation section in VTA files
+     * \param szCurrent Current position in the file. Points to the first
+     * data line of the section.
+     * \param szCurrentOut Receives a pointer to the heading line of
+     * the next section (or to EOF)
+    */
+    void ParseVASection(const char* szCurrent,
+        const char** szCurrentOut);
+
+    // -------------------------------------------------------------------
+    /** Parse the nodes section of the SMD file
+     * \param szCurrent Current position in the file. Points to the first
+     * data line of the section.
+     * \param szCurrentOut Receives a pointer to the heading line of
+     * the next section (or to EOF)
+    */
+    void ParseNodesSection(const char* szCurrent,
+        const char** szCurrentOut);
+
+    // -------------------------------------------------------------------
+    /** Parse the skeleton section of the SMD file
+     * \param szCurrent Current position in the file. Points to the first
+     * data line of the section.
+     * \param szCurrentOut Receives a pointer to the heading line of
+     * the next section (or to EOF)
+    */
+    void ParseSkeletonSection(const char* szCurrent,
+        const char** szCurrentOut);
+
+    // -------------------------------------------------------------------
+    /** Parse a single triangle in the SMD file
+     * \param szCurrent Current position in the file. Points to the first
+     * data line of the section.
+     * \param szCurrentOut Receives the output cursor position
+    */
+    void ParseTriangle(const char* szCurrent,
+        const char** szCurrentOut);
+
+
+    // -------------------------------------------------------------------
+    /** Parse a single vertex in the SMD file
+     * \param szCurrent Current position in the file. Points to the first
+     * data line of the section.
+     * \param szCurrentOut Receives the output cursor position
+     * \param vertex Vertex to be filled
+    */
+    void ParseVertex(const char* szCurrent,
+        const char** szCurrentOut, SMD::Vertex& vertex,
+        bool bVASection = false);
+
+    // -------------------------------------------------------------------
+    /** Get  the index of a texture. If the texture was not yet known
+     *  it will be added to the internal texture list.
+     * \param filename Name of the texture
+     * \return Value texture index
+     */
+    unsigned int GetTextureIndex(const std::string& filename);
+
+    // -------------------------------------------------------------------
+    /** Parse a line in the skeleton section
+     */
+    void ParseSkeletonElement(const char* szCurrent,
+        const char** szCurrentOut,int iTime);
+
+    // -------------------------------------------------------------------
+    /** Parse a line in the nodes section
+     */
+    void ParseNodeInfo(const char* szCurrent,
+        const char** szCurrentOut);
+
+
+    // -------------------------------------------------------------------
+    /** Parse a floating-point value
+     */
+    bool ParseFloat(const char* szCurrent,
+        const char** szCurrentOut, float& out);
+
+    // -------------------------------------------------------------------
+    /** Parse an unsigned integer. There may be no sign!
+     */
+    bool ParseUnsignedInt(const char* szCurrent,
+        const char** szCurrentOut, unsigned int& out);
+
+    // -------------------------------------------------------------------
+    /** Parse a signed integer. Signs (+,-) are handled.
+     */
+    bool ParseSignedInt(const char* szCurrent,
+        const char** szCurrentOut, int& out);
+
+    // -------------------------------------------------------------------
+    /** Fix invalid time values in the file
+     */
+    void FixTimeValues();
+
+    // -------------------------------------------------------------------
+    /** Add all children of a bone as subnodes to a node
+     * \param pcNode Parent node
+     * \param iParent Parent bone index
+     */
+    void AddBoneChildren(aiNode* pcNode, uint32_t iParent);
+
+    // -------------------------------------------------------------------
+    /** Build output meshes/materials/nodes/animations
+     */
+    void CreateOutputMeshes();
+    void CreateOutputNodes();
+    void CreateOutputAnimations(const std::string &pFile, IOSystem* pIOHandler);
+    void CreateOutputAnimation(int index, const std::string &name);
+    void GetAnimationFileList(const std::string &pFile, IOSystem* pIOHandler, std::vector<std::tuple<std::string, std::string>>& outList);
+    void CreateOutputMaterials();
+
+
+    // -------------------------------------------------------------------
+    /** Print a log message together with the current line number
+     */
+    void LogErrorNoThrow(const char* msg);
+    void LogWarning(const char* msg);
+
+
+    // -------------------------------------------------------------------
+    inline bool SkipLine( const char* in, const char** out)
+    {
+        Assimp::SkipLine(in,out);
+        ++iLineNumber;
+        return true;
+    }
+    // -------------------------------------------------------------------
+    inline bool SkipSpacesAndLineEnd( const char* in, const char** out)
+    {
+        ++iLineNumber;
+        return Assimp::SkipSpacesAndLineEnd(in,out);
+    }
+
+private:
+
+    /** Configuration option: frame to be loaded */
+    unsigned int configFrameID;
+
+    /** Buffer to hold the loaded file */
+    std::vector<char> mBuffer;
+
+    /** Output scene to be filled
+    */
+    aiScene* pScene;
+
+    /** Size of the input file in bytes
+     */
+    unsigned int iFileSize;
+
+    /** Array of textures found in the file
+     */
+    std::vector<std::string> aszTextures;
+
+    /** Array of triangles found in the file
+     */
+    std::vector<SMD::Face> asTriangles;
+
+    /** Array of bones found in the file
+     */
+    std::vector<SMD::Bone> asBones;
+
+    /** Smallest frame index found in the skeleton
+     */
+    int iSmallestFrame;
+
+    /** Length of the whole animation, in frames
+     */
+    double dLengthOfAnim;
+
+    /** Do we have texture coordinates?
+     */
+    bool bHasUVs;
+
+    /** Current line number
+     */
+    unsigned int iLineNumber;
+
+    bool bLoadAnimationList = true;
+    bool noSkeletonMesh = false;
+};
+
+} // end of namespace Assimp
+
+#endif // AI_SMDIMPORTER_H_INC