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diff --git a/indra/newview/lllocalrendermaterials.h b/indra/newview/lllocalrendermaterials.h
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+++ b/indra/newview/lllocalrendermaterials.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_LOCALRENDERMATERIALS_H
+#define LL_LOCALRENDERMATERIALS_H
+
+#include "lleventtimer.h"
+#include "llpointer.h"
+
+class LLScrollListCtrl;
+class LLGLTFMaterial;
+class LLViewerObject;
+class LLViewerFetchedTexture;
+
+class LLLocalGLTFMaterial
+{
+public: /* main */
+    LLLocalGLTFMaterial(std::string filename);
+    ~LLLocalGLTFMaterial();
+
+public: /* accessors */
+    std::string	getFilename();
+    std::string	getShortName();
+    LLUUID		getTrackingID();
+    LLUUID		getWorldID();
+    bool		getValid();
+
+public: /* self update public section */
+    enum EUpdateType
+    {
+        UT_FIRSTUSE,
+        UT_REGUPDATE
+    };
+
+    bool updateSelf(EUpdateType = UT_REGUPDATE);
+
+private: /* self update private section */
+    bool loadMaterial(LLPointer<LLGLTFMaterial> raw);
+    void replaceIDs(LLUUID old_id, LLUUID new_id);
+    std::vector<LLViewerObject*> prepUpdateObjects(LLUUID old_id, U32 channel);
+    void updateUserPrims(LLUUID old_id, LLUUID new_id, U32 channel);
+
+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;
+    bool        mValid;
+    LLSD        mLastModified;
+    EExtension  mExtension;
+    ELinkStatus mLinkStatus;
+    S32         mUpdateRetries;
+
+    // material needs to maintain textures
+    LLPointer<LLViewerFetchedTexture> mAlbedoFetched;
+    LLPointer<LLViewerFetchedTexture> mNormalFetched;
+    LLPointer<LLViewerFetchedTexture> mMRFetched;
+    LLPointer<LLViewerFetchedTexture> mEmissiveFetched;
+};
+
+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:
+    bool         addUnit();
+    void         delUnit(LLUUID tracking_id);
+    bool         checkTextureDimensions(std::string filename);
+
+    LLUUID       getWorldID(LLUUID tracking_id);
+    bool         isLocal(LLUUID world_id);
+    std::string  getFilename(LLUUID tracking_id);
+
+    void         feedScrollList(LLScrollListCtrl* ctrl);
+    void         doUpdates();
+    void         setNeedsRebake();
+    void         doRebake();
+
+private:
+    std::list<LLLocalGLTFMaterial*>    mMaterialList;
+    LLLocalGLTFMaterialTimer           mTimer;
+    bool                         mNeedsRebake;
+    typedef std::list<LLLocalGLTFMaterial*>::iterator local_list_iter;
+};
+
+#endif // LL_LOCALRENDERMATERIALS_H
+