Merge downstream version 3.7.8 code

1 files changed, 763 insertions, 0 deletions

diff --git a/indra/newview/llscenemonitor.cpp b/indra/newview/llscenemonitor.cpp
new file mode 100644
index 0000000000..7f705e44d2
--- /dev/null
+++ b/indra/newview/llscenemonitor.cpp
@@ -0,0 +1,763 @@
+/** 
+ * @file llscenemonitor.cpp
+ * @brief monitor the scene loading process.
+ *
+ * $LicenseInfo:firstyear=2003&license=viewerlgpl$
+ * 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
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+#include "llrendertarget.h"
+#include "llscenemonitor.h"
+#include "llviewerwindow.h"
+#include "llviewerdisplay.h"
+#include "llviewercontrol.h"
+#include "llviewershadermgr.h"
+#include "llui.h"
+#include "llstartup.h"
+#include "llappviewer.h"
+#include "llwindow.h"
+#include "llpointer.h"
+#include "llspatialpartition.h"
+#include "llagent.h"
+#include "pipeline.h"
+#include "llviewerpartsim.h"
+
+LLSceneMonitorView* gSceneMonitorView = NULL;
+
+//
+//The procedures of monitoring when the scene finishes loading visually, 
+//i.e., no pixel differences among frames, are:
+//1, freeze all dynamic objects and avatars;
+//2, (?) disable all sky and water;
+//3, capture frames periodically, by calling "capture()";
+//4, compute pixel differences between two latest captured frames, by calling "compare()", results are stored at mDiff;
+//5, compute the number of pixels in mDiff above some tolerance threshold in GPU, by calling "calcDiffAggregate()";
+//6, use gl occlusion query to fetch the result from GPU, by calling "fetchQueryResult()";
+//END.
+//
+
+LLSceneMonitor::LLSceneMonitor() : 
+	mEnabled(false), 
+	mDiff(NULL),
+	mDiffResult(0.f),
+	mDiffTolerance(0.1f),
+	mDiffState(WAITING_FOR_NEXT_DIFF),
+	mDebugViewerVisible(false),
+	mQueryObject(0),
+	mDiffPixelRatio(0.5f)
+{
+	mFrames[0] = NULL;
+	mFrames[1] = NULL;
+}
+
+LLSceneMonitor::~LLSceneMonitor()
+{
+	mDiffState = VIEWER_QUITTING;
+	reset();
+
+	mDitheringTexture = NULL;
+}
+
+void LLSceneMonitor::reset()
+{
+	delete mFrames[0];
+	delete mFrames[1];
+	delete mDiff;
+
+	mFrames[0] = NULL;
+	mFrames[1] = NULL;
+	mDiff = NULL;
+
+	mMonitorRecording.reset();
+	mSceneLoadRecording.reset();
+	mRecordingTimer.reset();
+
+	unfreezeScene();
+
+	if(mQueryObject > 0)
+	{
+		LLOcclusionCullingGroup::releaseOcclusionQueryObjectName(mQueryObject);
+		mQueryObject = 0;
+	}
+}
+
+void LLSceneMonitor::generateDitheringTexture(S32 width, S32 height)
+{
+#if 1
+	//4 * 4 matrix
+	mDitherMatrixWidth = 4;	
+	S32 dither_matrix[4][4] = 
+	{
+		{1, 9, 3, 11}, 
+		{13, 5, 15, 7}, 
+		{4, 12, 2, 10}, 
+		{16, 8, 14, 6}
+	};
+	
+	mDitherScale = 255.f / 17;
+#else
+	//8 * 8 matrix
+	mDitherMatrixWidth = 16;	
+	S32 dither_matrix[16][16] = 
+	{
+		{1, 49, 13, 61, 4, 52, 16, 64, 1, 49, 13, 61, 4, 52, 16, 64}, 
+		{33, 17, 45, 29, 36, 20, 48, 32, 33, 17, 45, 29, 36, 20, 48, 32}, 
+		{9, 57, 5, 53, 12, 60, 8, 56, 9, 57, 5, 53, 12, 60, 8, 56}, 
+		{41, 25, 37, 21, 44, 28, 40, 24, 41, 25, 37, 21, 44, 28, 40, 24},
+		{3, 51, 15, 63, 2, 50, 14, 62, 3, 51, 15, 63, 2, 50, 14, 62},
+		{35, 19, 47, 31, 34, 18, 46, 30, 35, 19, 47, 31, 34, 18, 46, 30},
+		{11, 59, 7, 55, 10, 58, 6, 54, 11, 59, 7, 55, 10, 58, 6, 54},
+		{43, 27, 39, 23, 42, 26, 38, 22, 43, 27, 39, 23, 42, 26, 38, 22},
+		{1, 49, 13, 61, 4, 52, 16, 64, 1, 49, 13, 61, 4, 52, 16, 64}, 
+		{33, 17, 45, 29, 36, 20, 48, 32, 33, 17, 45, 29, 36, 20, 48, 32}, 
+		{9, 57, 5, 53, 12, 60, 8, 56, 9, 57, 5, 53, 12, 60, 8, 56}, 
+		{41, 25, 37, 21, 44, 28, 40, 24, 41, 25, 37, 21, 44, 28, 40, 24},
+		{3, 51, 15, 63, 2, 50, 14, 62, 3, 51, 15, 63, 2, 50, 14, 62},
+		{35, 19, 47, 31, 34, 18, 46, 30, 35, 19, 47, 31, 34, 18, 46, 30},
+		{11, 59, 7, 55, 10, 58, 6, 54, 11, 59, 7, 55, 10, 58, 6, 54},
+		{43, 27, 39, 23, 42, 26, 38, 22, 43, 27, 39, 23, 42, 26, 38, 22}
+	};
+
+	mDitherScale = 255.f / 65;
+#endif
+
+	LLPointer<LLImageRaw> image_raw = new LLImageRaw(mDitherMatrixWidth, mDitherMatrixWidth, 3);
+	U8* data = image_raw->getData();
+	for (S32 i = 0; i < mDitherMatrixWidth; i++)
+	{
+		for (S32 j = 0; j < mDitherMatrixWidth; j++)
+		{
+			U8 val = dither_matrix[i][j];
+			*data++ = val;
+			*data++ = val;
+			*data++ = val;
+		}
+	}
+
+	mDitheringTexture = LLViewerTextureManager::getLocalTexture(image_raw.get(), FALSE) ;
+	mDitheringTexture->setAddressMode(LLTexUnit::TAM_WRAP);
+	mDitheringTexture->setFilteringOption(LLTexUnit::TFO_POINT);
+	
+	mDitherScaleS = (F32)width / mDitherMatrixWidth;
+	mDitherScaleT = (F32)height / mDitherMatrixWidth;
+}
+
+void LLSceneMonitor::setDebugViewerVisible(bool visible) 
+{
+	mDebugViewerVisible = visible;
+}
+
+LLRenderTarget& LLSceneMonitor::getCaptureTarget()
+{
+	LLRenderTarget* cur_target = NULL;
+
+	S32 width = gViewerWindow->getWorldViewWidthRaw();
+	S32 height = gViewerWindow->getWorldViewHeightRaw();
+	
+	if(!mFrames[0])
+	{
+		mFrames[0] = new LLRenderTarget();
+		mFrames[0]->allocate(width, height, GL_RGB, false, false, LLTexUnit::TT_TEXTURE, true);
+		gGL.getTexUnit(0)->bind(mFrames[0]);
+		gGL.getTexUnit(0)->setTextureFilteringOption(LLTexUnit::TFO_POINT);
+		gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
+
+		cur_target = mFrames[0];
+	}
+	else if(!mFrames[1])
+	{
+		mFrames[1] = new LLRenderTarget();
+		mFrames[1]->allocate(width, height, GL_RGB, false, false, LLTexUnit::TT_TEXTURE, true);
+		gGL.getTexUnit(0)->bind(mFrames[1]);
+		gGL.getTexUnit(0)->setTextureFilteringOption(LLTexUnit::TFO_POINT);
+		gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
+
+		cur_target = mFrames[1];
+	}
+	else //swap
+	{
+		cur_target = mFrames[0];
+		mFrames[0] = mFrames[1];
+		mFrames[1] = cur_target;
+	}
+	
+	if(cur_target->getWidth() != width || cur_target->getHeight() != height) //size changed
+	{
+		cur_target->resize(width, height);
+	}
+
+	// we're promising the target exists
+	return *cur_target;
+}
+
+void LLSceneMonitor::freezeAvatar(LLCharacter* avatarp)
+{
+	if(mEnabled)
+	{
+		mAvatarPauseHandles.push_back(avatarp->requestPause());
+	}
+}
+
+void LLSceneMonitor::freezeScene()
+{
+	if(!mEnabled)
+	{
+		return;
+	}
+
+	//freeze all avatars
+	for (std::vector<LLCharacter*>::iterator iter = LLCharacter::sInstances.begin();
+		iter != LLCharacter::sInstances.end(); ++iter)
+	{
+		freezeAvatar((LLCharacter*)(*iter));
+	}
+
+	// freeze everything else
+	gSavedSettings.setBOOL("FreezeTime", TRUE);
+
+	//disable sky, water and clouds
+	gPipeline.clearRenderTypeMask(LLPipeline::RENDER_TYPE_SKY, LLPipeline::RENDER_TYPE_WL_SKY, 
+		LLPipeline::RENDER_TYPE_WATER, LLPipeline::RENDER_TYPE_CLOUDS, LLPipeline::END_RENDER_TYPES);
+
+	//disable particle system
+	LLViewerPartSim::getInstance()->enable(false);
+}
+
+void LLSceneMonitor::unfreezeScene()
+{
+	//thaw all avatars
+	mAvatarPauseHandles.clear();
+
+	if(mDiffState == VIEWER_QUITTING)
+	{
+		return;
+	}
+
+	// thaw everything else
+	gSavedSettings.setBOOL("FreezeTime", FALSE);
+
+	//enable sky, water and clouds
+	gPipeline.setRenderTypeMask(LLPipeline::RENDER_TYPE_SKY, LLPipeline::RENDER_TYPE_WL_SKY, 
+		LLPipeline::RENDER_TYPE_WATER, LLPipeline::RENDER_TYPE_CLOUDS, LLPipeline::END_RENDER_TYPES);
+
+	//enable particle system
+	LLViewerPartSim::getInstance()->enable(true);
+}
+
+void LLSceneMonitor::capture()
+{
+	static U32 last_capture_frame = 0;
+	static LLCachedControl<bool> monitor_enabled(gSavedSettings, "SceneLoadingMonitorEnabled");
+	static LLCachedControl<F32>  scene_load_sample_time(gSavedSettings, "SceneLoadingMonitorSampleTime");
+	static bool force_capture = true;
+
+	bool enabled = LLGLSLShader::sNoFixedFunction && (monitor_enabled || mDebugViewerVisible);
+	if(mEnabled != enabled)
+	{
+		if(mEnabled)
+		{			
+			mEnabled = enabled;
+			unfreezeScene();
+			reset();
+			force_capture = true;
+		}
+		else
+		{
+			mEnabled = enabled;
+			reset();
+			freezeScene();
+		}
+	}
+
+	if (mEnabled 
+		&& (mMonitorRecording.getSum(*LLViewerCamera::getVelocityStat()) > 0.1f
+			|| mMonitorRecording.getSum(*LLViewerCamera::getAngularVelocityStat()) > 0.05f))
+	{
+		reset();
+		freezeScene();
+		force_capture = true;
+	}
+
+	if(mEnabled
+		&& (mRecordingTimer.getElapsedTimeF32() > scene_load_sample_time() 
+			|| force_capture)
+		&& last_capture_frame != gFrameCount)
+	{
+		force_capture = false;
+
+		mSceneLoadRecording.resume();
+		mMonitorRecording.resume();
+
+		last_capture_frame = gFrameCount;
+
+		LLRenderTarget& cur_target = getCaptureTarget();
+
+		U32 old_FBO = LLRenderTarget::sCurFBO;
+
+		gGL.getTexUnit(0)->bind(&cur_target);
+		glBindFramebuffer(GL_READ_FRAMEBUFFER, 0); //point to the main frame buffer.
+		
+		glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, cur_target.getWidth(), cur_target.getHeight()); //copy the content
+	
+		glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+		glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);		
+		glBindFramebuffer(GL_FRAMEBUFFER, old_FBO);
+
+		mDiffState = NEED_DIFF;
+	}
+}
+
+bool LLSceneMonitor::needsUpdate() const
+{
+	return mDiffState == NEED_DIFF;
+}
+
+static LLTrace::BlockTimerStatHandle FTM_GENERATE_SCENE_LOAD_DITHER_TEXTURE("Generate Scene Load Dither Texture");
+static LLTrace::BlockTimerStatHandle FTM_SCENE_LOAD_IMAGE_DIFF("Scene Load Image Diff");
+
+static LLStaticHashedString sDitherScale("dither_scale");
+static LLStaticHashedString sDitherScaleS("dither_scale_s");
+static LLStaticHashedString sDitherScaleT("dither_scale_t");
+
+void LLSceneMonitor::compare()
+{
+#ifdef LL_WINDOWS
+	if(mDiffState != NEED_DIFF)
+	{
+		return;
+	}
+
+	if(!mFrames[0] || !mFrames[1])
+	{
+		return;
+	}
+	if(mFrames[0]->getWidth() != mFrames[1]->getWidth() || mFrames[0]->getHeight() != mFrames[1]->getHeight())
+	{	//size does not match
+		return; 
+	}
+
+	LL_RECORD_BLOCK_TIME(FTM_SCENE_LOAD_IMAGE_DIFF);
+	mDiffState = EXECUTE_DIFF;
+
+	S32 width = gViewerWindow->getWindowWidthRaw();
+	S32 height = gViewerWindow->getWindowHeightRaw();
+	if(!mDiff)
+	{
+		LL_RECORD_BLOCK_TIME(FTM_GENERATE_SCENE_LOAD_DITHER_TEXTURE);
+		mDiff = new LLRenderTarget();
+		mDiff->allocate(width, height, GL_RGBA, false, false, LLTexUnit::TT_TEXTURE, true);
+
+		generateDitheringTexture(width, height);
+	}
+	else if(mDiff->getWidth() != width || mDiff->getHeight() != height)
+	{
+		LL_RECORD_BLOCK_TIME(FTM_GENERATE_SCENE_LOAD_DITHER_TEXTURE);
+		mDiff->resize(width, height);
+		generateDitheringTexture(width, height);
+	}
+
+	mDiff->bindTarget();
+	mDiff->clear();
+	
+	gTwoTextureCompareProgram.bind();
+	
+	gTwoTextureCompareProgram.uniform1f(sDitherScale, mDitherScale);
+	gTwoTextureCompareProgram.uniform1f(sDitherScaleS, mDitherScaleS);
+	gTwoTextureCompareProgram.uniform1f(sDitherScaleT, mDitherScaleT);
+
+	gGL.getTexUnit(0)->activate();
+	gGL.getTexUnit(0)->enable(LLTexUnit::TT_TEXTURE);
+	gGL.getTexUnit(0)->bind(mFrames[0]);
+	gGL.getTexUnit(0)->activate();
+
+	gGL.getTexUnit(1)->activate();
+	gGL.getTexUnit(1)->enable(LLTexUnit::TT_TEXTURE);
+	gGL.getTexUnit(1)->bind(mFrames[1]);
+	gGL.getTexUnit(1)->activate();	
+	
+	gGL.getTexUnit(2)->activate();
+	gGL.getTexUnit(2)->enable(LLTexUnit::TT_TEXTURE);
+	gGL.getTexUnit(2)->bind(mDitheringTexture);
+	gGL.getTexUnit(2)->activate();	
+
+	gl_rect_2d_simple_tex(width, height);
+	
+	mDiff->flush();	
+
+	gTwoTextureCompareProgram.unbind();
+
+	gGL.getTexUnit(0)->disable();
+	gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
+	gGL.getTexUnit(1)->disable();
+	gGL.getTexUnit(1)->unbind(LLTexUnit::TT_TEXTURE);
+	gGL.getTexUnit(2)->disable();
+	gGL.getTexUnit(2)->unbind(LLTexUnit::TT_TEXTURE);
+
+	if (!mDebugViewerVisible)
+	{
+		calcDiffAggregate();
+	}
+#endif
+}
+
+static LLStaticHashedString sTolerance("tolerance");
+
+//calculate Diff aggregate information in GPU, and enable gl occlusion query to capture it.
+void LLSceneMonitor::calcDiffAggregate()
+{
+#ifdef LL_WINDOWS
+
+	LL_RECORD_BLOCK_TIME(FTM_SCENE_LOAD_IMAGE_DIFF);
+
+	if(mDiffState != EXECUTE_DIFF && !mDebugViewerVisible)
+	{
+		return;
+	}	
+
+	if(!mQueryObject)
+	{
+		mQueryObject = LLOcclusionCullingGroup::getNewOcclusionQueryObjectName();
+	}
+
+	LLGLDepthTest depth(true, false, GL_ALWAYS);
+	if(!mDebugViewerVisible)
+	{
+		glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+	}
+
+	LLGLSLShader* cur_shader = NULL;
+	
+	cur_shader = LLGLSLShader::sCurBoundShaderPtr;
+	gOneTextureFilterProgram.bind();
+	gOneTextureFilterProgram.uniform1f(sTolerance, mDiffTolerance);
+
+	if(mDiffState == EXECUTE_DIFF)
+	{
+		glBeginQueryARB(GL_SAMPLES_PASSED_ARB, mQueryObject);
+	}
+
+	gl_draw_scaled_target(0, 0, S32(mDiff->getWidth() * mDiffPixelRatio), S32(mDiff->getHeight() * mDiffPixelRatio), mDiff);
+
+	if(mDiffState == EXECUTE_DIFF)
+	{
+		glEndQueryARB(GL_SAMPLES_PASSED_ARB);
+		mDiffState = WAIT_ON_RESULT;
+	}
+		
+	gOneTextureFilterProgram.unbind();
+	
+	if(cur_shader != NULL)
+	{
+		cur_shader->bind();
+	}
+	
+	if(!mDebugViewerVisible)
+	{
+		glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+	}
+#endif
+}
+
+static LLTrace::EventStatHandle<> sFramePixelDiff("FramePixelDifference");
+void LLSceneMonitor::fetchQueryResult()
+{
+	LL_RECORD_BLOCK_TIME(FTM_SCENE_LOAD_IMAGE_DIFF);
+
+	// also throttle timing here, to avoid going below sample time due to phasing with frame capture
+	static LLCachedControl<F32>  scene_load_sample_time_control(gSavedSettings, "SceneLoadingMonitorSampleTime");
+	F32Seconds scene_load_sample_time = (F32Seconds)scene_load_sample_time_control();
+
+	if(mDiffState == WAIT_ON_RESULT 
+		&& !LLAppViewer::instance()->quitRequested())
+	{
+		mDiffState = WAITING_FOR_NEXT_DIFF;
+
+		GLuint available = 0;
+		glGetQueryObjectuivARB(mQueryObject, GL_QUERY_RESULT_AVAILABLE_ARB, &available);
+		if(available)
+		{
+			GLuint count = 0;
+			glGetQueryObjectuivARB(mQueryObject, GL_QUERY_RESULT_ARB, &count);
+	
+			mDiffResult = sqrtf(count * 0.5f / (mDiff->getWidth() * mDiff->getHeight() * mDiffPixelRatio * mDiffPixelRatio)); //0.5 -> (front face + back face)
+
+			LL_DEBUGS("SceneMonitor") << "Frame difference: " << mDiffResult << LL_ENDL;
+			record(sFramePixelDiff, mDiffResult);
+
+			static LLCachedControl<F32> diff_threshold(gSavedSettings,"SceneLoadingMonitorPixelDiffThreshold");
+			F32Seconds elapsed_time = mRecordingTimer.getElapsedTimeF32();
+
+			if (elapsed_time > scene_load_sample_time)
+			{
+				if(mDiffResult > diff_threshold())
+				{
+					mSceneLoadRecording.extend();
+					llassert_always(mSceneLoadRecording.getResults().getLastRecording().getDuration() > scene_load_sample_time);
+				}
+				else
+				{
+					mSceneLoadRecording.nextPeriod();
+				}
+				mRecordingTimer.reset();
+			}
+		}
+	}
+}
+
+//dump results to a file _scene_xmonitor_results.csv
+void LLSceneMonitor::dumpToFile(std::string file_name)
+{	using namespace LLTrace;
+
+	if (!hasResults()) return;
+
+	LL_INFOS("SceneMonitor") << "Saving scene load stats to " << file_name << LL_ENDL; 
+
+	std::ofstream os(file_name.c_str());
+
+	os << std::setprecision(10);
+
+	PeriodicRecording& scene_load_recording = mSceneLoadRecording.getResults();
+	const U32 frame_count = scene_load_recording.getNumRecordedPeriods();
+
+	F64Seconds frame_time;
+
+	os << "Stat";
+	for (S32 frame = 1; frame <= frame_count; frame++)
+	{
+		frame_time += scene_load_recording.getPrevRecording(frame_count - frame).getDuration();
+		os << ", " << frame_time.value();
+	}
+	os << '\n';
+
+	os << "Sample period(s)";
+	for (S32 frame = 1; frame <= frame_count; frame++)
+	{
+		frame_time = scene_load_recording.getPrevRecording(frame_count - frame).getDuration();
+		os << ", " << frame_time.value();
+	}
+	os << '\n';
+
+
+	typedef StatType<CountAccumulator> trace_count;
+	for (trace_count::instance_iter it = trace_count::beginInstances(), end_it = trace_count::endInstances();
+		it != end_it;
+		++it)
+	{
+		std::ostringstream row;
+		row << std::setprecision(10);
+
+		row << it->getName();
+
+		const char* unit_label = it->getUnitLabel();
+		if(unit_label[0])
+		{
+			row << "(" << unit_label << ")";
+		}
+
+		S32 samples = 0;
+
+		for (S32 frame = 1; frame <= frame_count; frame++)
+		{
+			Recording& recording = scene_load_recording.getPrevRecording(frame_count - frame);
+			samples += recording.getSampleCount(*it);
+			row << ", " << recording.getSum(*it);
+		}
+
+		row << '\n';
+
+		if (samples > 0)
+		{
+			os << row.str();
+		}
+	}
+
+	typedef StatType<EventAccumulator> trace_event;
+
+	for (trace_event::instance_iter it = trace_event::beginInstances(), end_it = trace_event::endInstances();
+		it != end_it;
+		++it)
+	{
+		std::ostringstream row;
+		row << std::setprecision(10);
+		row << it->getName();
+
+		const char* unit_label = it->getUnitLabel();
+		if(unit_label[0])
+		{
+			row << "(" << unit_label << ")";
+		}
+
+		S32 samples = 0;
+
+		for (S32 frame = 1; frame <= frame_count; frame++)
+		{
+			Recording& recording = scene_load_recording.getPrevRecording(frame_count - frame);
+			samples += recording.getSampleCount(*it);
+			F64 mean = recording.getMean(*it);
+			if (llisnan(mean))
+			{
+				row << ", n/a";
+			}
+			else
+			{
+				row << ", " << mean;
+			}
+		}
+
+		row << '\n';
+
+		if (samples > 0)
+		{
+			os << row.str();
+		}
+	}
+
+	typedef StatType<SampleAccumulator> trace_sample;
+
+	for (trace_sample::instance_iter it = trace_sample::beginInstances(), end_it = trace_sample::endInstances();
+		it != end_it;
+		++it)
+	{
+		std::ostringstream row;
+		row << std::setprecision(10);
+		row << it->getName();
+
+		const char* unit_label = it->getUnitLabel();
+		if(unit_label[0])
+		{
+			row << "(" << unit_label << ")";
+		}
+
+		S32 samples = 0;
+
+		for (S32 frame = 1; frame <= frame_count; frame++)
+		{
+			Recording& recording = scene_load_recording.getPrevRecording(frame_count - frame);
+			samples += recording.getSampleCount(*it);
+			F64 mean = recording.getMean(*it);
+			if (llisnan(mean))
+			{
+				row << ", n/a";
+			}
+			else
+			{
+				row << ", " << mean;
+			}
+		}
+
+		row << '\n'; 
+
+		if (samples > 0)
+		{
+			os << row.str();
+		}
+	}
+
+	typedef StatType<MemAccumulator> trace_mem;
+	for (trace_mem::instance_iter it = trace_mem::beginInstances(), end_it = trace_mem::endInstances();
+		it != end_it;
+		++it)
+	{
+		os << it->getName() << "(KiB)";
+
+		for (S32 frame = 1; frame <= frame_count; frame++)
+		{
+			os << ", " << scene_load_recording.getPrevRecording(frame_count - frame).getMax(*it).valueInUnits<LLUnits::Kilobytes>();
+		}
+
+		os << '\n';
+	}
+
+	os.flush();
+	os.close();
+}
+
+//-------------------------------------------------------------------------------------------------------------
+//definition of class LLSceneMonitorView
+//-------------------------------------------------------------------------------------------------------------
+LLSceneMonitorView::LLSceneMonitorView(const LLRect& rect)
+	:	LLFloater(LLSD())
+{
+	setRect(rect);
+	setVisible(FALSE);
+	
+	setCanMinimize(false);
+	setCanClose(true);
+}
+
+void LLSceneMonitorView::onClose(bool app_quitting)
+{
+	setVisible(false);	
+}
+
+void LLSceneMonitorView::onVisibilityChange(BOOL visible)
+{
+	visible = visible && LLGLSLShader::sNoFixedFunction;
+	LLSceneMonitor::getInstance()->setDebugViewerVisible(visible);
+}
+
+void LLSceneMonitorView::draw()
+{
+	const LLRenderTarget* target = LLSceneMonitor::getInstance()->getDiffTarget();
+	if(!target)
+	{
+		return;
+	}
+
+	F32 ratio = LLSceneMonitor::getInstance()->getDiffPixelRatio();
+	S32 height = (S32)(target->getHeight() * ratio);
+	S32 width = (S32)(target->getWidth() * ratio);
+	
+	LLRect new_rect;
+	new_rect.setLeftTopAndSize(getRect().mLeft, getRect().mTop, width, height);
+	setRect(new_rect);
+
+	//draw background
+	gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
+	gl_rect_2d(0, getRect().getHeight(), getRect().getWidth(), 0, LLColor4(0.f, 0.f, 0.f, 0.25f));
+	
+	LLSceneMonitor::getInstance()->calcDiffAggregate();
+
+	//show some texts
+	LLColor4 color = LLColor4::white;
+	S32 line_height = LLFontGL::getFontMonospace()->getLineHeight();
+
+	S32 lines = 0;
+	std::string num_str = llformat("Frame difference: %.6f", LLSceneMonitor::getInstance()->getDiffResult());
+	LLFontGL::getFontMonospace()->renderUTF8(num_str, 0, 5, getRect().getHeight() - line_height * lines, color, LLFontGL::LEFT, LLFontGL::TOP);
+	lines++;
+
+	num_str = llformat("Pixel tolerance: (R+G+B) < %.4f", LLSceneMonitor::getInstance()->getDiffTolerance());
+	LLFontGL::getFontMonospace()->renderUTF8(num_str, 0, 5, getRect().getHeight() - line_height * lines, color, LLFontGL::LEFT, LLFontGL::TOP);
+	lines++;
+
+	num_str = llformat("Sampling time: %.3f seconds", gSavedSettings.getF32("SceneLoadingMonitorSampleTime"));
+	LLFontGL::getFontMonospace()->renderUTF8(num_str, 0, 5, getRect().getHeight() - line_height * lines, color, LLFontGL::LEFT, LLFontGL::TOP);
+	lines++;
+
+	num_str = llformat("Scene Loading time: %.3f seconds", (F32)LLSceneMonitor::getInstance()->getRecording()->getResults().getDuration().value());
+	LLFontGL::getFontMonospace()->renderUTF8(num_str, 0, 5, getRect().getHeight() - line_height * lines, color, LLFontGL::LEFT, LLFontGL::TOP);
+	lines++;
+
+	LLView::draw();
+}
+