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diff --git a/indra/llrender/lltexture.h b/indra/llrender/lltexture.h
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+/** 
+ * @file lltexture.h
+ * @brief LLTexture definition
+ *
+ *	This class acts as a wrapper for OpenGL calls.
+ *	The goal of this class is to minimize the number of api calls due to legacy rendering
+ *	code, to define an interface for a multiple rendering API abstraction of the UI
+ *	rendering, and to abstract out direct rendering calls in a way that is cleaner and easier to maintain.
+ *
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_TEXTURE_H
+#define LL_TEXTURE_H
+
+#include "llrefcount.h"
+class LLImageGL ;
+class LLTexUnit ;
+class LLFontGL ;
+
+//
+//this is an abstract class as the parent for the class LLViewerTexture
+//through the following virtual functions, the class LLViewerTexture can be reached from /llrender.
+//
+class LLTexture : public LLRefCount
+{
+	friend class LLTexUnit ;
+	friend class LLFontGL ;
+
+protected:
+	virtual ~LLTexture();
+
+public:
+	LLTexture(){}
+
+	//
+	//interfaces to access LLViewerTexture
+	//
+	virtual S8         getType() const = 0 ;
+	virtual void       setKnownDrawSize(S32 width, S32 height) = 0 ;
+	virtual bool       bindDefaultImage(const S32 stage = 0) = 0 ;
+	virtual void       forceImmediateUpdate() = 0 ;
+	virtual void       setActive() = 0 ;
+	virtual S32	       getWidth(S32 discard_level = -1) const = 0 ;
+	virtual S32	       getHeight(S32 discard_level = -1) const = 0 ;
+
+private:
+	//note: do not make this function public.
+	virtual LLImageGL* getGLTexture() const = 0 ;
+
+	virtual void updateBindStatsForTester() = 0 ;
+};
+#endif
+