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diff --git a/indra/newview/llscenemonitor.h b/indra/newview/llscenemonitor.h
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+++ b/indra/newview/llscenemonitor.h
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+/** 
+ * @file llscenemonitor.h
+ * @brief monitor the process of scene loading
+ *
+ * $LicenseInfo:firstyear=2003&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, 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_LLSCENE_MONITOR_H
+#define LL_LLSCENE_MONITOR_H
+
+#include "llsingleton.h"
+#include "llmath.h"
+#include "llfloater.h"
+#include "llcharacter.h"
+#include "lltracerecording.h"
+
+class LLCharacter;
+class LLRenderTarget;
+class LLViewerTexture;
+
+class LLSceneMonitor :  public LLSingleton<LLSceneMonitor>
+{
+public:
+	LLSceneMonitor();
+	~LLSceneMonitor();
+
+	void destroyClass();
+	
+	void freezeAvatar(LLCharacter* avatarp);
+	void setDebugViewerVisible(BOOL visible);
+
+	void capture(); //capture the main frame buffer
+	void compare(); //compare the stored two buffers.	
+	void queryDiff();	
+	void fetchQueryResult();
+	void calcDiffAggregate();
+	void setDiffTolerance(F32 tol) {mDiffTolerance = tol;}
+
+	const LLRenderTarget* getDiffTarget() const {return mDiff;}
+	F32  getDiffTolerance() const {return mDiffTolerance;}
+	F32  getDiffResult() const { return mDiffResult;}
+	F32  getSamplingTime() const { return mSamplingTime;}
+	F32  getDiffPixelRatio() const { return mDiffPixelRatio;}
+	bool isEnabled()const {return mEnabled;}
+	bool needsUpdate() const;
+	
+	LLTrace::ExtendableRecording* getRecording() const {return mRecording;}
+
+private:
+	void freezeScene();
+	void unfreezeScene();
+	void reset();
+	bool preCapture();
+	void generateDitheringTexture(S32 width, S32 height);
+
+private:
+	BOOL mEnabled;
+	BOOL mNeedsUpdateDiff;
+	BOOL mHasNewDiff;
+	BOOL mHasNewQueryResult;
+	BOOL mDebugViewerVisible;
+
+	LLRenderTarget* mFrames[2];
+	LLRenderTarget* mDiff;
+	LLRenderTarget* mCurTarget;
+
+	GLuint  mQueryObject; //used for glQuery
+	F32     mDiffResult;  //aggregate results of mDiff.
+	F32     mDiffTolerance; //pixels are filtered out when R+G+B < mDiffTolerance
+
+	F32     mSamplingTime; //time interval to capture frames, in seconds
+	F32     mDiffPixelRatio; //ratio of pixels used for comparison against the original mDiff size along one dimension
+
+	LLPointer<LLViewerTexture> mDitheringTexture;
+	S32                        mDitherMatrixWidth;
+	F32                        mDitherScale;
+	F32                        mDitherScaleS;
+	F32                        mDitherScaleT;
+
+	std::vector<LLAnimPauseRequest> mAvatarPauseHandles;
+
+	LLTrace::ExtendableRecording* mRecording;
+};
+
+class LLSceneMonitorView : public LLFloater
+{
+public:
+	LLSceneMonitorView(const LLRect& rect);
+
+	virtual void draw();
+	virtual void setVisible(BOOL visible);
+
+protected:
+	virtual void onClickCloseBtn();
+};
+
+extern LLSceneMonitorView* gSceneMonitorView;
+
+#endif
+