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diff --git a/indra/newview/lllocalgltfmaterials.h b/indra/newview/lllocalgltfmaterials.h
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+++ b/indra/newview/lllocalgltfmaterials.h
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+/** 
+ * @file lllocalrendermaterials.h
+ * @brief Local GLTF materials header
+ *
+ * $LicenseInfo:firstyear=2022&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2022, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LOCALGLTFMATERIALS_H
+#define LL_LOCALGLTFMATERIALS_H
+
+#include "lleventtimer.h"
+#include "llpointer.h"
+#include "llgltfmateriallist.h"
+
+class LLScrollListCtrl;
+class LLGLTFMaterial;
+class LLViewerObject;
+class LLTextureEntry;
+
+class LLLocalGLTFMaterial : public LLFetchedGLTFMaterial
+{
+public: /* main */
+    LLLocalGLTFMaterial(std::string filename, S32 index);
+    virtual ~LLLocalGLTFMaterial();
+
+public: /* accessors */
+    std::string	getFilename() const;
+    std::string	getShortName() const;
+    LLUUID		getTrackingID() const;
+    LLUUID		getWorldID() const;
+    S32			getIndexInFile() const;
+
+    void addTextureEntry(LLTextureEntry* te) override;
+    void removeTextureEntry(LLTextureEntry* te) override;
+
+public:
+    bool updateSelf();
+
+private:
+    bool loadMaterial();
+
+private: /* private enums */
+    enum ELinkStatus
+    {
+        LS_ON,
+        LS_BROKEN,
+    };
+
+    enum EExtension
+    {
+        ET_MATERIAL_GLTF,
+        ET_MATERIAL_GLB,
+    };
+
+private: /* members */
+    std::string mFilename;
+    std::string mShortName;
+    LLUUID      mTrackingID;
+    LLUUID      mWorldID;
+    LLSD        mLastModified;
+    EExtension  mExtension;
+    ELinkStatus mLinkStatus;
+    S32         mUpdateRetries;
+    S32         mMaterialIndex; // Single file can have more than one
+    std::set<LLTextureEntry*> mTextureEntires;
+};
+
+class LLLocalGLTFMaterialTimer : public LLEventTimer
+{
+public:
+    LLLocalGLTFMaterialTimer();
+    ~LLLocalGLTFMaterialTimer();
+
+public:
+    void startTimer();
+    void stopTimer();
+    bool isRunning();
+    BOOL tick();
+};
+
+class LLLocalGLTFMaterialMgr : public LLSingleton<LLLocalGLTFMaterialMgr>
+{
+    LLSINGLETON(LLLocalGLTFMaterialMgr);
+    ~LLLocalGLTFMaterialMgr();
+public:
+    S32          addUnit(const std::vector<std::string>& filenames);
+    S32          addUnit(const std::string& filename); // file can hold multiple materials
+    void         delUnit(LLUUID tracking_id);
+
+    LLUUID       getWorldID(LLUUID tracking_id);
+    bool         isLocal(LLUUID world_id);
+    void         getFilenameAndIndex(LLUUID tracking_id, std::string &filename, S32 &index);
+
+    void         feedScrollList(LLScrollListCtrl* ctrl);
+    void         doUpdates();
+
+private:
+    std::list<LLPointer<LLLocalGLTFMaterial> >    mMaterialList;
+    LLLocalGLTFMaterialTimer           mTimer;
+    typedef std::list<LLPointer<LLLocalGLTFMaterial> >::iterator local_list_iter;
+};
+
+#endif // LL_LOCALGLTFMATERIALS_H
+