1 files changed, 239 insertions, 119 deletions

diff --git a/indra/newview/llviewertexture.cpp b/indra/newview/llviewertexture.cpp
index 6160510c0e..61236edc86 100644
--- a/indra/newview/llviewertexture.cpp
+++ b/indra/newview/llviewertexture.cpp
@@ -66,6 +66,7 @@
 
 // statics
 LLPointer<LLViewerTexture>        LLViewerTexture::sNullImagep = NULL;
+LLPointer<LLViewerTexture>        LLViewerTexture::sBlackImagep = NULL;
 LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sMissingAssetImagep = NULL;
 LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sWhiteImagep = NULL;
 LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sDefaultImagep = NULL;
@@ -295,17 +296,23 @@ LLViewerFetchedTexture* LLViewerTextureManager::getFetchedTextureFromHost(const
 
 void LLViewerTextureManager::init()
 {
-	LLPointer<LLImageRaw> raw = new LLImageRaw(1,1,3);
-	raw->clear(0x77, 0x77, 0x77, 0xFF);
-	LLViewerTexture::sNullImagep = LLViewerTextureManager::getLocalTexture(raw.get(), TRUE) ;
-
-#if 1
-	LLPointer<LLViewerFetchedTexture> imagep = LLViewerTextureManager::getFetchedTexture(IMG_DEFAULT);
-	LLViewerFetchedTexture::sDefaultImagep = imagep;
+	{
+		LLPointer<LLImageRaw> raw = new LLImageRaw(1,1,3);
+		raw->clear(0x77, 0x77, 0x77, 0xFF);
+		LLViewerTexture::sNullImagep = LLViewerTextureManager::getLocalTexture(raw.get(), TRUE) ;
+	}
 
 	const S32 dim = 128;
 	LLPointer<LLImageRaw> image_raw = new LLImageRaw(dim,dim,3);
 	U8* data = image_raw->getData();
+	
+	memset(data, 0, dim * dim * 3) ;
+	LLViewerTexture::sBlackImagep = LLViewerTextureManager::getLocalTexture(image_raw.get(), TRUE) ;
+
+#if 1
+	LLPointer<LLViewerFetchedTexture> imagep = LLViewerTextureManager::getFetchedTexture(IMG_DEFAULT);
+	LLViewerFetchedTexture::sDefaultImagep = imagep;
+	
 	for (S32 i = 0; i<dim; i++)
 	{
 		for (S32 j = 0; j<dim; j++)
@@ -359,6 +366,7 @@ void LLViewerTextureManager::cleanup()
 
 	LLImageGL::sDefaultGLTexture = NULL ;
 	LLViewerTexture::sNullImagep = NULL;
+	LLViewerTexture::sBlackImagep = NULL;
 	LLViewerFetchedTexture::sDefaultImagep = NULL;	
 	LLViewerFetchedTexture::sSmokeImagep = NULL;
 	LLViewerFetchedTexture::sMissingAssetImagep = NULL;
@@ -409,6 +417,64 @@ const S32 min_non_tex_system_mem = (128<<20); // 128 MB
 F32 texmem_lower_bound_scale = 0.85f;
 F32 texmem_middle_bound_scale = 0.925f;
 
+static LLFastTimer::DeclareTimer FTM_TEXTURE_MEMORY_CHECK("Memory Check");
+
+//static 
+bool LLViewerTexture::isMemoryForTextureLow()
+{
+	const F32 WAIT_TIME = 1.0f ; //second
+	static LLFrameTimer timer ;
+
+	if(timer.getElapsedTimeF32() < WAIT_TIME) //call this once per second.
+	{
+		return false;
+	}
+	timer.reset() ;
+
+	LLFastTimer t(FTM_TEXTURE_MEMORY_CHECK);
+
+	const S32 MIN_FREE_TEXTURE_MEMORY = 5 ; //MB
+	const S32 MIN_FREE_MAIN_MEMORy = 100 ; //MB	
+
+	bool low_mem = false ;
+	if (gGLManager.mHasATIMemInfo)
+	{
+		S32 meminfo[4];
+		glGetIntegerv(GL_TEXTURE_FREE_MEMORY_ATI, meminfo);
+
+		if(meminfo[0] / 1024 < MIN_FREE_TEXTURE_MEMORY)
+		{
+			low_mem = true ;
+		}
+
+		if(!low_mem) //check main memory, only works for windows.
+		{
+			LLMemory::updateMemoryInfo() ;
+			if(LLMemory::getAvailableMemKB() / 1024 < MIN_FREE_MAIN_MEMORy)
+			{
+				low_mem = true ;
+			}
+		}
+	}
+#if 0  //ignore nVidia cards
+	else if (gGLManager.mHasNVXMemInfo)
+	{
+		S32 free_memory;
+		glGetIntegerv(GL_GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX, &free_memory);
+		
+		if(free_memory / 1024 < MIN_FREE_TEXTURE_MEMORY)
+		{
+			low_mem = true ;
+		}
+	}
+#endif	
+
+	return low_mem ;
+}
+
+static LLFastTimer::DeclareTimer FTM_TEXTURE_UPDATE_MEDIA("Media");
+static LLFastTimer::DeclareTimer FTM_TEXTURE_UPDATE_TEST("Test");
+
 //static
 void LLViewerTexture::updateClass(const F32 velocity, const F32 angular_velocity)
 {
@@ -417,9 +483,14 @@ void LLViewerTexture::updateClass(const F32 velocity, const F32 angular_velocity
 	LLTexturePipelineTester* tester = (LLTexturePipelineTester*)LLMetricPerformanceTesterBasic::getTester(sTesterName);
 	if (tester)
 	{
+		LLFastTimer t(FTM_TEXTURE_UPDATE_TEST);
 		tester->update() ;
 	}
-	LLViewerMediaTexture::updateClass() ;
+
+	{
+		LLFastTimer t(FTM_TEXTURE_UPDATE_MEDIA);
+		LLViewerMediaTexture::updateClass() ;
+	}
 
 	sBoundTextureMemoryInBytes = LLImageGL::sBoundTextureMemoryInBytes;//in bytes
 	sTotalTextureMemoryInBytes = LLImageGL::sGlobalTextureMemoryInBytes;//in bytes
@@ -441,6 +512,11 @@ void LLViewerTexture::updateClass(const F32 velocity, const F32 angular_velocity
 			sEvaluationTimer.reset();
 		}
 	}
+	else if(sEvaluationTimer.getElapsedTimeF32() > discard_delta_time && isMemoryForTextureLow())
+	{
+		sDesiredDiscardBias += discard_bias_delta;
+		sEvaluationTimer.reset();
+	}
 	else if (sDesiredDiscardBias > 0.0f &&
 			 BYTES_TO_MEGA_BYTES(sBoundTextureMemoryInBytes) < sMaxBoundTextureMemInMegaBytes * texmem_lower_bound_scale &&
 			 BYTES_TO_MEGA_BYTES(sTotalTextureMemoryInBytes) < sMaxTotalTextureMemInMegaBytes * texmem_lower_bound_scale)
@@ -599,7 +675,7 @@ bool LLViewerTexture::bindDefaultImage(S32 stage)
 	}
 	if (!res && LLViewerTexture::sNullImagep.notNull() && (this != LLViewerTexture::sNullImagep))
 	{
-		res = gGL.getTexUnit(stage)->bind(LLViewerTexture::sNullImagep) ;
+		res = gGL.getTexUnit(stage)->bind(LLViewerTexture::sNullImagep);
 	}
 	if (!res)
 	{
@@ -835,7 +911,7 @@ BOOL LLViewerTexture::createGLTexture(S32 discard_level, const LLImageRaw* image
 	llassert(mGLTexturep.notNull()) ;	
 
 	BOOL ret = mGLTexturep->createGLTexture(discard_level, imageraw, usename, to_create, category) ;
-	
+
 	if(ret)
 	{
 		mFullWidth = mGLTexturep->getCurrentWidth() ;
@@ -1168,6 +1244,7 @@ void LLViewerFetchedTexture::init(bool firstinit)
 	mSavedRawDiscardLevel = -1 ;
 	mDesiredSavedRawDiscardLevel = -1 ;
 	mLastReferencedSavedRawImageTime = 0.0f ;
+	mKeptSavedRawImageTime = 0.f ;
 	mLastCallBackActiveTime = 0.f;
 }
 
@@ -1214,12 +1291,15 @@ void LLViewerFetchedTexture::cleanup()
 
 void LLViewerFetchedTexture::setForSculpt()
 {
+	static const S32 MAX_INTERVAL = 8 ; //frames
+
 	mForSculpt = TRUE ;
 	if(isForSculptOnly() && !getBoundRecently())
 	{
 		destroyGLTexture() ; //sculpt image does not need gl texture.
 	}
 	checkCachedRawSculptImage() ;
+	setMaxVirtualSizeResetInterval(MAX_INTERVAL) ;
 }
 
 BOOL LLViewerFetchedTexture::isForSculptOnly() const
@@ -1412,63 +1492,68 @@ BOOL LLViewerFetchedTexture::createTexture(S32 usename/*= 0*/)
 // 						mRawImage->getWidth(), mRawImage->getHeight(),mRawImage->getDataSize())
 // 			<< mID.getString() << llendl;
 	BOOL res = TRUE;
-	if (!gNoRender)
+
+	// store original size only for locally-sourced images
+	if (mUrl.compare(0, 7, "file://") == 0)
 	{
-		// store original size only for locally-sourced images
-		if (mUrl.compare(0, 7, "file://") == 0)
-		{
-			mOrigWidth = mRawImage->getWidth();
-			mOrigHeight = mRawImage->getHeight();
+		mOrigWidth = mRawImage->getWidth();
+		mOrigHeight = mRawImage->getHeight();
 
-			// leave black border, do not scale image content
-			mRawImage->expandToPowerOfTwo(MAX_IMAGE_SIZE, FALSE);
 			
-			mFullWidth = mRawImage->getWidth();
-			mFullHeight = mRawImage->getHeight();
-			setTexelsPerImage();
+		if (mBoostLevel == BOOST_PREVIEW)
+		{ 
+			mRawImage->biasedScaleToPowerOfTwo(1024);
 		}
 		else
-		{
-			mOrigWidth = mFullWidth;
-			mOrigHeight = mFullHeight;
-		}
-
-		bool size_okay = true;
-		
-		U32 raw_width = mRawImage->getWidth() << mRawDiscardLevel;
-		U32 raw_height = mRawImage->getHeight() << mRawDiscardLevel;
-		if( raw_width > MAX_IMAGE_SIZE || raw_height > MAX_IMAGE_SIZE )
-		{
-			llinfos << "Width or height is greater than " << MAX_IMAGE_SIZE << ": (" << raw_width << "," << raw_height << ")" << llendl;
-			size_okay = false;
-		}
-		
-		if (!LLImageGL::checkSize(mRawImage->getWidth(), mRawImage->getHeight()))
-		{
-			// A non power-of-two image was uploaded (through a non standard client)
-			llinfos << "Non power of two width or height: (" << mRawImage->getWidth() << "," << mRawImage->getHeight() << ")" << llendl;
-			size_okay = false;
-		}
-		
-		if( !size_okay )
-		{
-			// An inappropriately-sized image was uploaded (through a non standard client)
-			// We treat these images as missing assets which causes them to
-			// be renderd as 'missing image' and to stop requesting data
-			setIsMissingAsset();
-			destroyRawImage();
-			return FALSE;
+		{ // leave black border, do not scale image content
+			mRawImage->expandToPowerOfTwo(MAX_IMAGE_SIZE, FALSE);
 		}
 		
-		if(!(res = insertToAtlas()))
-		{
-			res = mGLTexturep->createGLTexture(mRawDiscardLevel, mRawImage, usename, TRUE, mBoostLevel);
-			resetFaceAtlas() ;
-		}
-		setActive() ;
+		mFullWidth = mRawImage->getWidth();
+		mFullHeight = mRawImage->getHeight();
+		setTexelsPerImage();
+	}
+	else
+	{
+		mOrigWidth = mFullWidth;
+		mOrigHeight = mFullHeight;
 	}
 
-	if (!mForceToSaveRawImage)
+	bool size_okay = true;
+	
+	U32 raw_width = mRawImage->getWidth() << mRawDiscardLevel;
+	U32 raw_height = mRawImage->getHeight() << mRawDiscardLevel;
+	if( raw_width > MAX_IMAGE_SIZE || raw_height > MAX_IMAGE_SIZE )
+	{
+		llinfos << "Width or height is greater than " << MAX_IMAGE_SIZE << ": (" << raw_width << "," << raw_height << ")" << llendl;
+		size_okay = false;
+	}
+	
+	if (!LLImageGL::checkSize(mRawImage->getWidth(), mRawImage->getHeight()))
+	{
+		// A non power-of-two image was uploaded (through a non standard client)
+		llinfos << "Non power of two width or height: (" << mRawImage->getWidth() << "," << mRawImage->getHeight() << ")" << llendl;
+		size_okay = false;
+	}
+	
+	if( !size_okay )
+	{
+		// An inappropriately-sized image was uploaded (through a non standard client)
+		// We treat these images as missing assets which causes them to
+		// be renderd as 'missing image' and to stop requesting data
+		setIsMissingAsset();
+		destroyRawImage();
+		return FALSE;
+	}
+	
+	if(!(res = insertToAtlas()))
+	{
+		res = mGLTexturep->createGLTexture(mRawDiscardLevel, mRawImage, usename, TRUE, mBoostLevel);
+		resetFaceAtlas() ;
+	}
+	setActive() ;
+
+	if (!needsToSaveRawImage())
 	{
 		mNeedsAux = FALSE;
 		destroyRawImage();
@@ -1494,57 +1579,56 @@ void LLViewerFetchedTexture::setKnownDrawSize(S32 width, S32 height)
 //virtual
 void LLViewerFetchedTexture::processTextureStats()
 {
-	static LLCachedControl<bool> textures_fullres(gSavedSettings,"TextureLoadFullRes");
-
 	if(mFullyLoaded)
-	{
-		if(needsToSaveRawImage())//needs to reload
+	{		
+		if(mDesiredDiscardLevel > mMinDesiredDiscardLevel)//need to load more
 		{
+			mDesiredDiscardLevel = llmin(mDesiredDiscardLevel, mMinDesiredDiscardLevel) ;
 			mFullyLoaded = FALSE ;
 		}
-		else
-		{
-			return ;
-		}
-	}
-
-	//updateVirtualSize() ;	
-	
-	if (textures_fullres)
-	{
-		mDesiredDiscardLevel = 0;
-	}
-	else if(!mFullWidth || !mFullHeight)
-	{
-		mDesiredDiscardLevel = 	llmin(getMaxDiscardLevel(), (S32)mLoadedCallbackDesiredDiscardLevel) ;
 	}
 	else
-	{	
-		if(!mKnownDrawWidth || !mKnownDrawHeight || mFullWidth <= mKnownDrawWidth || mFullHeight <= mKnownDrawHeight)
+	{
+		updateVirtualSize() ;
+		
+		static LLCachedControl<bool> textures_fullres(gSavedSettings,"TextureLoadFullRes");
+		
+		if (textures_fullres)
+		{
+			mDesiredDiscardLevel = 0;
+		}
+		else if(!mFullWidth || !mFullHeight)
 		{
-			if (mFullWidth > MAX_IMAGE_SIZE_DEFAULT || mFullHeight > MAX_IMAGE_SIZE_DEFAULT)
+			mDesiredDiscardLevel = 	llmin(getMaxDiscardLevel(), (S32)mLoadedCallbackDesiredDiscardLevel) ;
+		}
+		else
+		{	
+			if(!mKnownDrawWidth || !mKnownDrawHeight || mFullWidth <= mKnownDrawWidth || mFullHeight <= mKnownDrawHeight)
 			{
-				mDesiredDiscardLevel = 1; // MAX_IMAGE_SIZE_DEFAULT = 1024 and max size ever is 2048
+				if (mFullWidth > MAX_IMAGE_SIZE_DEFAULT || mFullHeight > MAX_IMAGE_SIZE_DEFAULT)
+				{
+					mDesiredDiscardLevel = 1; // MAX_IMAGE_SIZE_DEFAULT = 1024 and max size ever is 2048
+				}
+				else
+				{
+					mDesiredDiscardLevel = 0;
+				}
 			}
-			else
+			else if(mKnownDrawSizeChanged)//known draw size is set
+			{			
+				mDesiredDiscardLevel = (S8)llmin(log((F32)mFullWidth / mKnownDrawWidth) / log_2, 
+													 log((F32)mFullHeight / mKnownDrawHeight) / log_2) ;
+				mDesiredDiscardLevel = 	llclamp(mDesiredDiscardLevel, (S8)0, (S8)getMaxDiscardLevel()) ;
+				mDesiredDiscardLevel = llmin(mDesiredDiscardLevel, mMinDesiredDiscardLevel) ;
+			}
+			mKnownDrawSizeChanged = FALSE ;
+		
+			if(getDiscardLevel() >= 0 && (getDiscardLevel() <= mDesiredDiscardLevel))
 			{
-				mDesiredDiscardLevel = 0;
+				mFullyLoaded = TRUE ;
 			}
 		}
-		else if(mKnownDrawSizeChanged)//known draw size is set
-		{			
-			mDesiredDiscardLevel = (S8)llmin(log((F32)mFullWidth / mKnownDrawWidth) / log_2, 
-												 log((F32)mFullHeight / mKnownDrawHeight) / log_2) ;
-			mDesiredDiscardLevel = 	llclamp(mDesiredDiscardLevel, (S8)0, (S8)getMaxDiscardLevel()) ;
-			mDesiredDiscardLevel = llmin(mDesiredDiscardLevel, mMinDesiredDiscardLevel) ;
-		}
-		mKnownDrawSizeChanged = FALSE ;
-	
-		if(getDiscardLevel() >= 0 && (getDiscardLevel() <= mDesiredDiscardLevel))
-		{
-			mFullyLoaded = TRUE ;
-		}
-	}	
+	}
 
 	if(mForceToSaveRawImage && mDesiredSavedRawDiscardLevel >= 0) //force to refetch the texture.
 	{
@@ -1583,7 +1667,7 @@ F32 LLViewerFetchedTexture::calcDecodePriority()
 
 	S32 cur_discard = getCurrentDiscardLevelForFetching();
 	bool have_all_data = (cur_discard >= 0 && (cur_discard <= mDesiredDiscardLevel));
-	F32 pixel_priority = fsqrtf(mMaxVirtualSize);
+	F32 pixel_priority = (F32) sqrt(mMaxVirtualSize);
 
 	F32 priority = 0.f;
 
@@ -2206,6 +2290,7 @@ void LLViewerFetchedTexture::unpauseLoadedCallbacks(const LLLoadedCallbackEntry:
 		}
 	}
 	mPauseLoadedCallBacks = FALSE ;
+	mLastCallBackActiveTime = sCurrentTime ;
 	if(need_raw)
 	{
 		mSaveRawImage = TRUE ;
@@ -2245,13 +2330,18 @@ void LLViewerFetchedTexture::pauseLoadedCallbacks(const LLLoadedCallbackEntry::s
 
 bool LLViewerFetchedTexture::doLoadedCallbacks()
 {
-	static const F32 MAX_INACTIVE_TIME = 120.f ; //seconds
+	static const F32 MAX_INACTIVE_TIME = 900.f ; //seconds
 
 	if (mNeedsCreateTexture)
 	{
 		return false;
 	}
-	if(sCurrentTime - mLastCallBackActiveTime > MAX_INACTIVE_TIME)
+	if(mPauseLoadedCallBacks)
+	{
+		destroyRawImage();
+		return false; //paused
+	}	
+	if(sCurrentTime - mLastCallBackActiveTime > MAX_INACTIVE_TIME && !mIsFetching)
 	{
 		clearCallbackEntryList() ; //remove all callbacks.
 		return false ;
@@ -2274,12 +2364,8 @@ bool LLViewerFetchedTexture::doLoadedCallbacks()
 
 		// Remove ourself from the global list of textures with callbacks
 		gTextureList.mCallbackList.erase(this);
-	}
-	if(mPauseLoadedCallBacks)
-	{
-		destroyRawImage();
-		return res; //paused
-	}
+		return false ;
+	}	
 
 	S32 gl_discard = getDiscardLevel();
 
@@ -2541,7 +2627,11 @@ bool LLViewerFetchedTexture::needsToSaveRawImage()
 
 void LLViewerFetchedTexture::destroyRawImage()
 {	
-	if (mAuxRawImage.notNull()) sAuxCount--;
+	if (mAuxRawImage.notNull())
+	{
+		sAuxCount--;
+		mAuxRawImage = NULL;
+	}
 
 	if (mRawImage.notNull()) 
 	{
@@ -2555,12 +2645,12 @@ void LLViewerFetchedTexture::destroyRawImage()
 			}		
 			setCachedRawImage() ;
 		}
+		
+		mRawImage = NULL;
+	
+		mIsRawImageValid = FALSE;
+		mRawDiscardLevel = INVALID_DISCARD_LEVEL;
 	}
-
-	mRawImage = NULL;
-	mAuxRawImage = NULL;
-	mIsRawImageValid = FALSE;
-	mRawDiscardLevel = INVALID_DISCARD_LEVEL;
 }
 
 //use the mCachedRawImage to (re)generate the gl texture.
@@ -2689,12 +2779,18 @@ void LLViewerFetchedTexture::saveRawImage()
 	mLastReferencedSavedRawImageTime = sCurrentTime ;
 }
 
-void LLViewerFetchedTexture::forceToSaveRawImage(S32 desired_discard, bool from_callback) 
+void LLViewerFetchedTexture::forceToSaveRawImage(S32 desired_discard, F32 kept_time) 
 { 
-	if(!mForceToSaveRawImage || mDesiredSavedRawDiscardLevel < 0 || mDesiredSavedRawDiscardLevel > desired_discard)
+	mKeptSavedRawImageTime = kept_time ;
+	mLastReferencedSavedRawImageTime = sCurrentTime ;
+
+	if(mSavedRawDiscardLevel > -1 && mSavedRawDiscardLevel <= desired_discard)
 	{
-		llassert_always(from_callback || mBoostLevel == LLViewerTexture::BOOST_PREVIEW) ;
+		return ; //raw imge is ready.
+	}
 
+	if(!mForceToSaveRawImage || mDesiredSavedRawDiscardLevel < 0 || mDesiredSavedRawDiscardLevel > desired_discard)
+	{
 		mForceToSaveRawImage = TRUE ;
 		mDesiredSavedRawDiscardLevel = desired_discard ;
 	
@@ -2708,11 +2804,19 @@ void LLViewerFetchedTexture::forceToSaveRawImage(S32 desired_discard, bool from_
 
 			mRawImage = NULL ;
 			mRawDiscardLevel = INVALID_DISCARD_LEVEL ;
-		}
+		}		
 	}
 }
 void LLViewerFetchedTexture::destroySavedRawImage()
 {
+	if(mLastReferencedSavedRawImageTime < mKeptSavedRawImageTime)
+	{
+		return ; //keep the saved raw image.
+	}
+
+	mForceToSaveRawImage  = FALSE ;
+	mSaveRawImage = FALSE ;
+
 	clearCallbackEntryList() ;
 	
 	mSavedRawImage = NULL ;
@@ -2721,6 +2825,7 @@ void LLViewerFetchedTexture::destroySavedRawImage()
 	mSavedRawDiscardLevel = -1 ;
 	mDesiredSavedRawDiscardLevel = -1 ;
 	mLastReferencedSavedRawImageTime = 0.0f ;
+	mKeptSavedRawImageTime = 0.f ;
 }
 
 LLImageRaw* LLViewerFetchedTexture::getSavedRawImage() 
@@ -2872,7 +2977,7 @@ BOOL LLViewerFetchedTexture::insertToAtlas()
 	}
 
 	//process the waiting_list
-	for(ll_face_list_t::iterator iter = waiting_list.begin(); iter != waiting_list.end(); ++iter)
+	for(std::vector<LLFace*>::iterator iter = waiting_list.begin(); iter != waiting_list.end(); ++iter)
 	{
 		facep = (LLFace*)*iter ;	
 		groupp = facep->getDrawable()->getSpatialGroup() ;
@@ -3058,8 +3163,13 @@ void LLViewerLODTexture::processTextureStats()
 		S32 current_discard = getDiscardLevel();
 		if (sDesiredDiscardBias > 0.0f && mBoostLevel < LLViewerTexture::BOOST_SCULPTED && current_discard >= 0)
 		{
+			if(desired_discard_bias_max <= sDesiredDiscardBias && !mForceToSaveRawImage)
+			{
+				//needs to release texture memory urgently
+				scaleDown() ;
+			}
 			// Limit the amount of GL memory bound each frame
-			if ( BYTES_TO_MEGA_BYTES(sBoundTextureMemoryInBytes) > sMaxBoundTextureMemInMegaBytes * texmem_middle_bound_scale &&
+			else if ( BYTES_TO_MEGA_BYTES(sBoundTextureMemoryInBytes) > sMaxBoundTextureMemInMegaBytes * texmem_middle_bound_scale &&
 				(!getBoundRecently() || mDesiredDiscardLevel >= mCachedRawDiscardLevel))
 			{
 				scaleDown() ;
@@ -3078,9 +3188,16 @@ void LLViewerLODTexture::processTextureStats()
 	{
 		mDesiredDiscardLevel = llmin(mDesiredDiscardLevel, (S8)mDesiredSavedRawDiscardLevel) ;
 	}
+	else if(LLPipeline::sMemAllocationThrottled)//release memory of large textures by decrease their resolutions.
+	{
+		if(scaleDown())
+		{
+			mDesiredDiscardLevel = mCachedRawDiscardLevel ;
+		}
+	}
 }
 
-void LLViewerLODTexture::scaleDown()
+bool LLViewerLODTexture::scaleDown()
 {
 	if(hasGLTexture() && mCachedRawDiscardLevel > getDiscardLevel())
 	{		
@@ -3091,7 +3208,10 @@ void LLViewerLODTexture::scaleDown()
 		{
 			tester->setStablizingTime() ;
 		}
+
+		return true ;
 	}
+	return false ;
 }
 //----------------------------------------------------------------------------------------------
 //end of LLViewerLODTexture