/** 
 * @file llviewertexture.cpp
 * @brief Object which handles a received image (and associated texture(s))
 *
 * $LicenseInfo:firstyear=2000&license=viewerlgpl$
 * 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 "llviewertexture.h"

// Library includes
#include "llmath.h"
#include "llerror.h"
#include "llgl.h"
#include "llglheaders.h"
#include "llhost.h"
#include "llimage.h"
#include "llimagebmp.h"
#include "llimagej2c.h"
#include "llimagetga.h"
#include "llstl.h"
#include "message.h"
#include "lltimer.h"

// viewer includes
#include "llimagegl.h"
#include "lldrawpool.h"
#include "lltexturefetch.h"
#include "llviewertexturelist.h"
#include "llviewercontrol.h"
#include "pipeline.h"
#include "llappviewer.h"
#include "llface.h"
#include "llviewercamera.h"
#include "lltextureentry.h"
#include "lltexturemanagerbridge.h"
#include "llmediaentry.h"
#include "llvovolume.h"
#include "llviewermedia.h"
#include "lltexturecache.h"
#include "llviewerwindow.h"
#include "llwindow.h"
///////////////////////////////////////////////////////////////////////////////

// extern
const S32Megabytes gMinVideoRam(32);
const S32Megabytes gMaxVideoRam(512);


// statics
LLPointer<LLViewerTexture>        LLViewerTexture::sNullImagep = NULL;
LLPointer<LLViewerTexture>        LLViewerTexture::sBlackImagep = NULL;
LLPointer<LLViewerTexture>        LLViewerTexture::sCheckerBoardImagep = NULL;
LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sMissingAssetImagep = NULL;
LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sWhiteImagep = NULL;
LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sDefaultImagep = NULL;
LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sSmokeImagep = NULL;
LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sFlatNormalImagep = NULL;
LLPointer<LLViewerFetchedTexture> LLViewerFetchedTexture::sDefaultIrradiancePBRp;
LLViewerMediaTexture::media_map_t LLViewerMediaTexture::sMediaMap;
LLTexturePipelineTester* LLViewerTextureManager::sTesterp = NULL;
F32 LLViewerFetchedTexture::sMaxVirtualSize = 8192.f*8192.f;

const std::string sTesterName("TextureTester");

S32 LLViewerTexture::sImageCount = 0;
S32 LLViewerTexture::sRawCount = 0;
S32 LLViewerTexture::sAuxCount = 0;
LLFrameTimer LLViewerTexture::sEvaluationTimer;
F32 LLViewerTexture::sDesiredDiscardBias = 0.f;
F32 LLViewerTexture::sDesiredDiscardScale = 1.1f;
S8  LLViewerTexture::sCameraMovingDiscardBias = 0;
F32 LLViewerTexture::sCameraMovingBias = 0.0f;
S32 LLViewerTexture::sMaxSculptRez = 128; //max sculpt image size
const S32 MAX_CACHED_RAW_IMAGE_AREA = 64 * 64;
const S32 MAX_CACHED_RAW_SCULPT_IMAGE_AREA = LLViewerTexture::sMaxSculptRez * LLViewerTexture::sMaxSculptRez;
const S32 MAX_CACHED_RAW_TERRAIN_IMAGE_AREA = 128 * 128;
const S32 DEFAULT_ICON_DIMENTIONS = 32;
U32 LLViewerTexture::sMinLargeImageSize = 65536; //256 * 256.
U32 LLViewerTexture::sMaxSmallImageSize = MAX_CACHED_RAW_IMAGE_AREA;
bool LLViewerTexture::sFreezeImageUpdates = false;
F32 LLViewerTexture::sCurrentTime = 0.0f;

LLViewerTexture::EDebugTexels LLViewerTexture::sDebugTexelsMode = LLViewerTexture::DEBUG_TEXELS_OFF;

const F32 desired_discard_bias_min = -2.0f; // -max number of levels to improve image quality by
const F32 desired_discard_bias_max = (F32)MAX_DISCARD_LEVEL; // max number of levels to reduce image quality by
const F64 log_2 = log(2.0);

#if ADDRESS_SIZE == 32
const U32 DESIRED_NORMAL_TEXTURE_SIZE = (U32)LLViewerFetchedTexture::MAX_IMAGE_SIZE_DEFAULT / 2;
#else
const U32 DESIRED_NORMAL_TEXTURE_SIZE = (U32)LLViewerFetchedTexture::MAX_IMAGE_SIZE_DEFAULT;
#endif

//----------------------------------------------------------------------------------------------
//namespace: LLViewerTextureAccess
//----------------------------------------------------------------------------------------------

LLLoadedCallbackEntry::LLLoadedCallbackEntry(loaded_callback_func cb,
					  S32 discard_level,
					  BOOL need_imageraw, // Needs image raw for the callback
					  void* userdata,
					  LLLoadedCallbackEntry::source_callback_list_t* src_callback_list,
					  LLViewerFetchedTexture* target,
					  BOOL pause) 
	: mCallback(cb),
	  mLastUsedDiscard(MAX_DISCARD_LEVEL+1),
	  mDesiredDiscard(discard_level),
	  mNeedsImageRaw(need_imageraw),
	  mUserData(userdata),
	  mSourceCallbackList(src_callback_list),
	  mPaused(pause)
{
	if(mSourceCallbackList)
	{
        mSourceCallbackList->insert(LLTextureKey(target->getID(), (ETexListType)target->getTextureListType()));
	}
}

LLLoadedCallbackEntry::~LLLoadedCallbackEntry()
{
}

void LLLoadedCallbackEntry::removeTexture(LLViewerFetchedTexture* tex)
{
	if(mSourceCallbackList)
	{
		mSourceCallbackList->erase(LLTextureKey(tex->getID(), (ETexListType)tex->getTextureListType()));
	}
}

//static 
void LLLoadedCallbackEntry::cleanUpCallbackList(LLLoadedCallbackEntry::source_callback_list_t* callback_list)
{
	//clear texture callbacks.
	if(callback_list && !callback_list->empty())
	{
		for(LLLoadedCallbackEntry::source_callback_list_t::iterator iter = callback_list->begin();
				iter != callback_list->end(); ++iter)
		{
			LLViewerFetchedTexture* tex = gTextureList.findImage(*iter);
			if(tex)
			{
				tex->deleteCallbackEntry(callback_list);			
			}
		}
		callback_list->clear();
	}
}

LLViewerMediaTexture* LLViewerTextureManager::createMediaTexture(const LLUUID &media_id, BOOL usemipmaps, LLImageGL* gl_image)
{
	return new LLViewerMediaTexture(media_id, usemipmaps, gl_image);		
}

void LLViewerTextureManager::findFetchedTextures(const LLUUID& id, std::vector<LLViewerFetchedTexture*> &output)
{
    return gTextureList.findTexturesByID(id, output);
}

void  LLViewerTextureManager::findTextures(const LLUUID& id, std::vector<LLViewerTexture*> &output)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
    std::vector<LLViewerFetchedTexture*> fetched_output;
    gTextureList.findTexturesByID(id, fetched_output);
    std::vector<LLViewerFetchedTexture*>::iterator iter = fetched_output.begin();
    while (iter != fetched_output.end())
    {
        output.push_back(*iter);
        iter++;
    }

    //search media texture list
    if (output.empty())
    {
        LLViewerTexture* tex;
        tex = LLViewerTextureManager::findMediaTexture(id);
        if (tex)
        {
            output.push_back(tex);
        }
    }

}

LLViewerFetchedTexture* LLViewerTextureManager::findFetchedTexture(const LLUUID& id, S32 tex_type)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
    return gTextureList.findImage(id, (ETexListType)tex_type);
}

LLViewerMediaTexture* LLViewerTextureManager::findMediaTexture(const LLUUID &media_id)
{
	return LLViewerMediaTexture::findMediaTexture(media_id);	
}

LLViewerMediaTexture*  LLViewerTextureManager::getMediaTexture(const LLUUID& id, BOOL usemipmaps, LLImageGL* gl_image) 
{
	LLViewerMediaTexture* tex = LLViewerMediaTexture::findMediaTexture(id);	
	if(!tex)
	{
		tex = LLViewerTextureManager::createMediaTexture(id, usemipmaps, gl_image);
	}

	tex->initVirtualSize();

	return tex;
}

LLViewerFetchedTexture* LLViewerTextureManager::staticCastToFetchedTexture(LLTexture* tex, BOOL report_error)
{
	if(!tex)
	{
		return NULL;
	}

	S8 type = tex->getType();
	if(type == LLViewerTexture::FETCHED_TEXTURE || type == LLViewerTexture::LOD_TEXTURE)
	{
		return static_cast<LLViewerFetchedTexture*>(tex);
	}

	if(report_error)
	{
		LL_ERRS() << "not a fetched texture type: " << type << LL_ENDL;
	}

	return NULL;
}

LLPointer<LLViewerTexture> LLViewerTextureManager::getLocalTexture(BOOL usemipmaps, BOOL generate_gl_tex)
{
	LLPointer<LLViewerTexture> tex = new LLViewerTexture(usemipmaps);
	if(generate_gl_tex)
	{
		tex->generateGLTexture();
		tex->setCategory(LLGLTexture::LOCAL);
	}
	return tex;
}
LLPointer<LLViewerTexture> LLViewerTextureManager::getLocalTexture(const LLUUID& id, BOOL usemipmaps, BOOL generate_gl_tex) 
{
	LLPointer<LLViewerTexture> tex = new LLViewerTexture(id, usemipmaps);
	if(generate_gl_tex)
	{
		tex->generateGLTexture();
		tex->setCategory(LLGLTexture::LOCAL);
	}
	return tex;
}
LLPointer<LLViewerTexture> LLViewerTextureManager::getLocalTexture(const LLImageRaw* raw, BOOL usemipmaps) 
{
	LLPointer<LLViewerTexture> tex = new LLViewerTexture(raw, usemipmaps);
	tex->setCategory(LLGLTexture::LOCAL);
	return tex;
}
LLPointer<LLViewerTexture> LLViewerTextureManager::getLocalTexture(const U32 width, const U32 height, const U8 components, BOOL usemipmaps, BOOL generate_gl_tex) 
{
	LLPointer<LLViewerTexture> tex = new LLViewerTexture(width, height, components, usemipmaps);
	if(generate_gl_tex)
	{
		tex->generateGLTexture();
		tex->setCategory(LLGLTexture::LOCAL);
	}
	return tex;
}

LLViewerFetchedTexture* LLViewerTextureManager::getFetchedTexture(const LLImageRaw* raw, FTType type, bool usemipmaps)
{
    LLViewerFetchedTexture* ret = new LLViewerFetchedTexture(raw, type, usemipmaps);
    gTextureList.addImage(ret, TEX_LIST_STANDARD);
    return ret;
}

LLViewerFetchedTexture* LLViewerTextureManager::getFetchedTexture(
	                                               const LLUUID &image_id,											       
												   FTType f_type,
												   BOOL usemipmaps,
												   LLViewerTexture::EBoostLevel boost_priority,
												   S8 texture_type,
												   LLGLint internal_format,
												   LLGLenum primary_format,
												   LLHost request_from_host)
{
	return gTextureList.getImage(image_id, f_type, usemipmaps, boost_priority, texture_type, internal_format, primary_format, request_from_host);
}
	
LLViewerFetchedTexture* LLViewerTextureManager::getFetchedTextureFromFile(
	                                               const std::string& filename,
												   FTType f_type,
												   BOOL usemipmaps,
												   LLViewerTexture::EBoostLevel boost_priority,
												   S8 texture_type,
												   LLGLint internal_format,
												   LLGLenum primary_format, 
												   const LLUUID& force_id)
{
	return gTextureList.getImageFromFile(filename, f_type, usemipmaps, boost_priority, texture_type, internal_format, primary_format, force_id);
}

//static 
LLViewerFetchedTexture* LLViewerTextureManager::getFetchedTextureFromUrl(const std::string& url,
									 FTType f_type,
									 BOOL usemipmaps,
									 LLViewerTexture::EBoostLevel boost_priority,
									 S8 texture_type,
									 LLGLint internal_format,
									 LLGLenum primary_format,
									 const LLUUID& force_id
									 )
{
	return gTextureList.getImageFromUrl(url, f_type, usemipmaps, boost_priority, texture_type, internal_format, primary_format, force_id);
}

LLViewerFetchedTexture* LLViewerTextureManager::getFetchedTextureFromHost(const LLUUID& image_id, FTType f_type, LLHost host) 
{
	return gTextureList.getImageFromHost(image_id, f_type, host);
}

// Create a bridge to the viewer texture manager.
class LLViewerTextureManagerBridge : public LLTextureManagerBridge
{
	/*virtual*/ LLPointer<LLGLTexture> getLocalTexture(BOOL usemipmaps = TRUE, BOOL generate_gl_tex = TRUE)
	{
		return LLViewerTextureManager::getLocalTexture(usemipmaps, generate_gl_tex);
	}

	/*virtual*/ LLPointer<LLGLTexture> getLocalTexture(const U32 width, const U32 height, const U8 components, BOOL usemipmaps, BOOL generate_gl_tex = TRUE)
	{
		return LLViewerTextureManager::getLocalTexture(width, height, components, usemipmaps, generate_gl_tex);
	}

	/*virtual*/ LLGLTexture* getFetchedTexture(const LLUUID &image_id)
	{
		return LLViewerTextureManager::getFetchedTexture(image_id);
	}
};


void LLViewerTextureManager::init()
{
	{
		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++)
		{
#if 0
			const S32 border = 2;
			if (i<border || j<border || i>=(dim-border) || j>=(dim-border))
			{
				*data++ = 0xff;
				*data++ = 0xff;
				*data++ = 0xff;
			}
			else
#endif
			{
				*data++ = 0x7f;
				*data++ = 0x7f;
				*data++ = 0x7f;
			}
		}
	}
	imagep->createGLTexture(0, image_raw);
	//cache the raw image
	imagep->setCachedRawImage(0, image_raw);
	image_raw = NULL;
#else
 	LLViewerFetchedTexture::sDefaultImagep = LLViewerTextureManager::getFetchedTexture(IMG_DEFAULT, TRUE, LLGLTexture::BOOST_UI);
#endif
	LLViewerFetchedTexture::sDefaultImagep->dontDiscard();
	LLViewerFetchedTexture::sDefaultImagep->setCategory(LLGLTexture::OTHER);

	image_raw = new LLImageRaw(32,32,3);
	data = image_raw->getData();

	for (S32 i = 0; i < (32*32*3); i+=3)
	{
		S32 x = (i % (32*3)) / (3*16);
		S32 y = i / (32*3*16);
		U8 color = ((x + y) % 2) * 255;
		data[i] = color;
		data[i+1] = color;
		data[i+2] = color;
	}

	LLViewerTexture::sCheckerBoardImagep = LLViewerTextureManager::getLocalTexture(image_raw.get(), TRUE);

	LLViewerTexture::initClass();
	
	// Create a texture manager bridge.
	gTextureManagerBridgep = new LLViewerTextureManagerBridge;

	if (LLMetricPerformanceTesterBasic::isMetricLogRequested(sTesterName) && !LLMetricPerformanceTesterBasic::getTester(sTesterName))
	{
		sTesterp = new LLTexturePipelineTester();
		if (!sTesterp->isValid())
		{
			delete sTesterp;
			sTesterp = NULL;
		}
	}
}

void LLViewerTextureManager::cleanup()
{
	stop_glerror();

	delete gTextureManagerBridgep;
	LLImageGL::sDefaultGLTexture = NULL;
	LLViewerTexture::sNullImagep = NULL;
	LLViewerTexture::sBlackImagep = NULL;
	LLViewerTexture::sCheckerBoardImagep = NULL;
	LLViewerFetchedTexture::sDefaultImagep = NULL;	
	LLViewerFetchedTexture::sSmokeImagep = NULL;
	LLViewerFetchedTexture::sMissingAssetImagep = NULL;
	LLTexUnit::sWhiteTexture = 0;
	LLViewerFetchedTexture::sWhiteImagep = NULL;
	
	LLViewerFetchedTexture::sFlatNormalImagep = NULL;
	LLViewerFetchedTexture::sDefaultIrradiancePBRp = NULL;

	LLViewerMediaTexture::cleanUpClass();	
}

//----------------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------------------
//start of LLViewerTexture
//----------------------------------------------------------------------------------------------
// static
void LLViewerTexture::initClass()
{
	LLImageGL::sDefaultGLTexture = LLViewerFetchedTexture::sDefaultImagep->getGLTexture();
}

// tuning params
const F32 discard_bias_delta = .25f;
const F32 discard_delta_time = 0.5f;
const F32 GPU_MEMORY_CHECK_WAIT_TIME = 1.0f;
// non-const (used externally
F32 texmem_lower_bound_scale = 0.85f;
F32 texmem_middle_bound_scale = 0.925f;

//static 
bool LLViewerTexture::isMemoryForTextureLow()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
    // Note: we need to figure out a better source for 'min' values,
    // what is free for low end at minimal settings is 'nothing left'
    // for higher end gpus at high settings.
    const S32Megabytes MIN_FREE_TEXTURE_MEMORY(20);
    const S32Megabytes MIN_FREE_MAIN_MEMORY(100);

    S32Megabytes gpu;
    S32Megabytes physical;
    getGPUMemoryForTextures(gpu, physical);

    return (gpu < MIN_FREE_TEXTURE_MEMORY); // || (physical < MIN_FREE_MAIN_MEMORY);
}

//static
bool LLViewerTexture::isMemoryForTextureSuficientlyFree()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
    const S32Megabytes DESIRED_FREE_TEXTURE_MEMORY(50);
    const S32Megabytes DESIRED_FREE_MAIN_MEMORY(200);

    S32Megabytes gpu;
    S32Megabytes physical;
    getGPUMemoryForTextures(gpu, physical);

    return (gpu > DESIRED_FREE_TEXTURE_MEMORY); // && (physical > DESIRED_FREE_MAIN_MEMORY);
}

//static
void LLViewerTexture::getGPUMemoryForTextures(S32Megabytes &gpu, S32Megabytes &physical)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
    static LLFrameTimer timer;

    static S32Megabytes gpu_res = S32Megabytes(S32_MAX);
    static S32Megabytes physical_res = S32Megabytes(S32_MAX);
    
    if (timer.getElapsedTimeF32() < GPU_MEMORY_CHECK_WAIT_TIME) //call this once per second.
    {
        gpu = gpu_res;
        physical = physical_res;
        return;
    }
    timer.reset();

    {
        gpu_res = (S32Megabytes)gViewerWindow->getWindow()->getAvailableVRAMMegabytes();
        
        //check main memory, only works for windows and macos.
        LLMemory::updateMemoryInfo();
        physical_res = LLMemory::getAvailableMemKB();

        gpu = gpu_res;
        physical = physical_res;
    }
}

//static
void LLViewerTexture::updateClass()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	sCurrentTime = gFrameTimeSeconds;

	LLTexturePipelineTester* tester = (LLTexturePipelineTester*)LLMetricPerformanceTesterBasic::getTester(sTesterName);
	if (tester)
	{
		tester->update();
	}

	LLViewerMediaTexture::updateClass();

	if(isMemoryForTextureLow())
	{
		// Note: isMemoryForTextureLow() uses 1s delay, make sure we waited enough for it to recheck
		if (sEvaluationTimer.getElapsedTimeF32() > GPU_MEMORY_CHECK_WAIT_TIME)
		{
			sDesiredDiscardBias += discard_bias_delta;
			sEvaluationTimer.reset();
		}
	}
	else if (sDesiredDiscardBias > 0.0f
			 && isMemoryForTextureSuficientlyFree())
	{
		// If we are using less texture memory than we should,
		// scale down the desired discard level
		if (sEvaluationTimer.getElapsedTimeF32() > discard_delta_time)
		{
			sDesiredDiscardBias -= discard_bias_delta;
			sEvaluationTimer.reset();
		}
	}
	sDesiredDiscardBias = llclamp(sDesiredDiscardBias, desired_discard_bias_min, desired_discard_bias_max);

	LLViewerTexture::sFreezeImageUpdates = sDesiredDiscardBias > (desired_discard_bias_max - 1.0f);
}

//end of static functions
//-------------------------------------------------------------------------------------------
const U32 LLViewerTexture::sCurrentFileVersion = 1;

LLViewerTexture::LLViewerTexture(BOOL usemipmaps) :
	LLGLTexture(usemipmaps)
{
	init(true);

	mID.generate();
	sImageCount++;
}

LLViewerTexture::LLViewerTexture(const LLUUID& id, BOOL usemipmaps) :
	LLGLTexture(usemipmaps),
	mID(id)
{
	init(true);
	
	sImageCount++;
}

LLViewerTexture::LLViewerTexture(const U32 width, const U32 height, const U8 components, BOOL usemipmaps)  :
	LLGLTexture(width, height, components, usemipmaps)
{
	init(true);

	mID.generate();
	sImageCount++;
}

LLViewerTexture::LLViewerTexture(const LLImageRaw* raw, BOOL usemipmaps) :
	LLGLTexture(raw, usemipmaps)
{
	init(true);
	
	mID.generate();
	sImageCount++;
}

LLViewerTexture::~LLViewerTexture()
{
	// LL_DEBUGS("Avatar") << mID << LL_ENDL;
	cleanup();
	sImageCount--;
}

// virtual
void LLViewerTexture::init(bool firstinit)
{
	mSelectedTime = 0.f;
	mMaxVirtualSize = 0.f;
	mMaxVirtualSizeResetInterval = 1;
	mMaxVirtualSizeResetCounter = mMaxVirtualSizeResetInterval;
	mParcelMedia = NULL;
	
	memset(&mNumVolumes, 0, sizeof(U32)* LLRender::NUM_VOLUME_TEXTURE_CHANNELS);
	mFaceList[LLRender::DIFFUSE_MAP].clear();
	mFaceList[LLRender::NORMAL_MAP].clear();
	mFaceList[LLRender::SPECULAR_MAP].clear();
	mNumFaces[LLRender::DIFFUSE_MAP] = 
	mNumFaces[LLRender::NORMAL_MAP] = 
	mNumFaces[LLRender::SPECULAR_MAP] = 0;
	
	mVolumeList[LLRender::LIGHT_TEX].clear();
	mVolumeList[LLRender::SCULPT_TEX].clear();

	mMainQueue	= LL::WorkQueue::getInstance("mainloop");
	mImageQueue = LL::WorkQueue::getInstance("LLImageGL");
}

//virtual 
S8 LLViewerTexture::getType() const
{
	return LLViewerTexture::LOCAL_TEXTURE;
}

void LLViewerTexture::cleanup()
{
    if (LLAppViewer::getTextureFetch())
    {
        LLAppViewer::getTextureFetch()->updateRequestPriority(mID, 0.f);
    }

	mFaceList[LLRender::DIFFUSE_MAP].clear();
	mFaceList[LLRender::NORMAL_MAP].clear();
	mFaceList[LLRender::SPECULAR_MAP].clear();
	mVolumeList[LLRender::LIGHT_TEX].clear();
	mVolumeList[LLRender::SCULPT_TEX].clear();
}

// virtual
void LLViewerTexture::dump()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	LLGLTexture::dump();

	LL_INFOS() << "LLViewerTexture"
			<< " mID " << mID
			<< LL_ENDL;
}

void LLViewerTexture::setBoostLevel(S32 level)
{
	if(mBoostLevel != level)
	{
		mBoostLevel = level;
		if(mBoostLevel != LLViewerTexture::BOOST_NONE && 
			mBoostLevel != LLViewerTexture::BOOST_ALM && 
			mBoostLevel != LLViewerTexture::BOOST_SELECTED && 
			mBoostLevel != LLViewerTexture::BOOST_ICON)
		{
			setNoDelete();		
		}
	}

    // strongly encourage anything boosted to load at full res
    if (mBoostLevel >= LLViewerTexture::BOOST_HIGH)
    {
        mMaxVirtualSize = 2048.f * 2048.f;
    }

	if (mBoostLevel == LLViewerTexture::BOOST_SELECTED)
	{
		mSelectedTime = gFrameTimeSeconds;
	}

}

bool LLViewerTexture::isActiveFetching()
{
	return false;
}

bool LLViewerTexture::bindDebugImage(const S32 stage)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if (stage < 0) return false;

	bool res = true;
	if (LLViewerTexture::sCheckerBoardImagep.notNull() && (this != LLViewerTexture::sCheckerBoardImagep.get()))
	{
		res = gGL.getTexUnit(stage)->bind(LLViewerTexture::sCheckerBoardImagep);
	}

	if(!res)
	{
		return bindDefaultImage(stage);
	}

	return res;
}

bool LLViewerTexture::bindDefaultImage(S32 stage) 
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if (stage < 0) return false;

	bool res = true;
	if (LLViewerFetchedTexture::sDefaultImagep.notNull() && (this != LLViewerFetchedTexture::sDefaultImagep.get()))
	{
		// use default if we've got it
		res = gGL.getTexUnit(stage)->bind(LLViewerFetchedTexture::sDefaultImagep);
	}
	if (!res && LLViewerTexture::sNullImagep.notNull() && (this != LLViewerTexture::sNullImagep))
	{
		res = gGL.getTexUnit(stage)->bind(LLViewerTexture::sNullImagep);
	}
	if (!res)
	{
		LL_WARNS() << "LLViewerTexture::bindDefaultImage failed." << LL_ENDL;
	}
	stop_glerror();

	//check if there is cached raw image and switch to it if possible
	switchToCachedImage();

	LLTexturePipelineTester* tester = (LLTexturePipelineTester*)LLMetricPerformanceTesterBasic::getTester(sTesterName);
	if (tester)
	{
		tester->updateGrayTextureBinding();
	}
	return res;
}

//virtual 
BOOL LLViewerTexture::isMissingAsset()const		
{ 
	return FALSE; 
}

//virtual 
void LLViewerTexture::forceImmediateUpdate() 
{
}

void LLViewerTexture::addTextureStats(F32 virtual_size, BOOL needs_gltexture) const 
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if(needs_gltexture)
	{
		mNeedsGLTexture = TRUE;
	}

    virtual_size = llmin(virtual_size, LLViewerFetchedTexture::sMaxVirtualSize);

	if (virtual_size > mMaxVirtualSize)
	{
		mMaxVirtualSize = virtual_size;
	}
}

void LLViewerTexture::resetTextureStats()
{
	mMaxVirtualSize = 0.0f;
	mMaxVirtualSizeResetCounter = 0;
}

//virtual 
F32 LLViewerTexture::getMaxVirtualSize()
{
	return mMaxVirtualSize;
}

//virtual 
void LLViewerTexture::setKnownDrawSize(S32 width, S32 height)
{
	//nothing here.
}

//virtual
void LLViewerTexture::addFace(U32 ch, LLFace* facep) 
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	llassert(ch < LLRender::NUM_TEXTURE_CHANNELS);

	if(mNumFaces[ch] >= mFaceList[ch].size())
	{
		mFaceList[ch].resize(2 * mNumFaces[ch] + 1);		
	}
	mFaceList[ch][mNumFaces[ch]] = facep;
	facep->setIndexInTex(ch, mNumFaces[ch]);
	mNumFaces[ch]++;
	mLastFaceListUpdateTimer.reset();
}

//virtual
void LLViewerTexture::removeFace(U32 ch, LLFace* facep) 
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	llassert(ch < LLRender::NUM_TEXTURE_CHANNELS);

	if(mNumFaces[ch] > 1)
	{
		S32 index = facep->getIndexInTex(ch); 
		llassert(index < mFaceList[ch].size());
		llassert(index < mNumFaces[ch]);
		mFaceList[ch][index] = mFaceList[ch][--mNumFaces[ch]];
		mFaceList[ch][index]->setIndexInTex(ch, index);
	}
	else 
	{
		mFaceList[ch].clear();
		mNumFaces[ch] = 0;
	}
	mLastFaceListUpdateTimer.reset();
}

S32 LLViewerTexture::getTotalNumFaces() const
{
	S32 ret = 0;

	for (U32 i = 0; i < LLRender::NUM_TEXTURE_CHANNELS; ++i)
	{
		ret += mNumFaces[i];
	}

	return ret;
}

S32 LLViewerTexture::getNumFaces(U32 ch) const
{
	llassert(ch < LLRender::NUM_TEXTURE_CHANNELS);
	return mNumFaces[ch];
}


//virtual
void LLViewerTexture::addVolume(U32 ch, LLVOVolume* volumep)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if (mNumVolumes[ch] >= mVolumeList[ch].size())
	{
		mVolumeList[ch].resize(2 * mNumVolumes[ch] + 1);
	}
	mVolumeList[ch][mNumVolumes[ch]] = volumep;
	volumep->setIndexInTex(ch, mNumVolumes[ch]);
	mNumVolumes[ch]++;
	mLastVolumeListUpdateTimer.reset();
}

//virtual
void LLViewerTexture::removeVolume(U32 ch, LLVOVolume* volumep)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if (mNumVolumes[ch] > 1)
	{
		S32 index = volumep->getIndexInTex(ch); 
		llassert(index < mVolumeList[ch].size());
		llassert(index < mNumVolumes[ch]);
		mVolumeList[ch][index] = mVolumeList[ch][--mNumVolumes[ch]];
		mVolumeList[ch][index]->setIndexInTex(ch, index);
	}
	else 
	{
		mVolumeList[ch].clear();
		mNumVolumes[ch] = 0;
	}
	mLastVolumeListUpdateTimer.reset();
}

S32 LLViewerTexture::getNumVolumes(U32 ch) const
{
	return mNumVolumes[ch];
}

void LLViewerTexture::reorganizeFaceList()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	static const F32 MAX_WAIT_TIME = 20.f; // seconds
	static const U32 MAX_EXTRA_BUFFER_SIZE = 4;

	if(mLastFaceListUpdateTimer.getElapsedTimeF32() < MAX_WAIT_TIME)
	{
		return;
	}

	for (U32 i = 0; i < LLRender::NUM_TEXTURE_CHANNELS; ++i)
	{
		if(mNumFaces[i] + MAX_EXTRA_BUFFER_SIZE > mFaceList[i].size())
	{
		return;
	}

		mFaceList[i].erase(mFaceList[i].begin() + mNumFaces[i], mFaceList[i].end());
	}
	
	mLastFaceListUpdateTimer.reset();
}

void LLViewerTexture::reorganizeVolumeList()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	static const F32 MAX_WAIT_TIME = 20.f; // seconds
	static const U32 MAX_EXTRA_BUFFER_SIZE = 4;


	for (U32 i = 0; i < LLRender::NUM_VOLUME_TEXTURE_CHANNELS; ++i)
	{
		if (mNumVolumes[i] + MAX_EXTRA_BUFFER_SIZE > mVolumeList[i].size())
		{
			return;
		}
	}

	if(mLastVolumeListUpdateTimer.getElapsedTimeF32() < MAX_WAIT_TIME)
	{
		return;
	}

	mLastVolumeListUpdateTimer.reset();
	for (U32 i = 0; i < LLRender::NUM_VOLUME_TEXTURE_CHANNELS; ++i)
	{
		mVolumeList[i].erase(mVolumeList[i].begin() + mNumVolumes[i], mVolumeList[i].end());
	}
}

//virtual
void LLViewerTexture::switchToCachedImage()
{
	//nothing here.
}

//virtual
void LLViewerTexture::setCachedRawImage(S32 discard_level, LLImageRaw* imageraw)
{
	//nothing here.
}

BOOL LLViewerTexture::isLargeImage()
{
	return  (S32)mTexelsPerImage > LLViewerTexture::sMinLargeImageSize;
}

//virtual 
void LLViewerTexture::updateBindStatsForTester()
{
	LLTexturePipelineTester* tester = (LLTexturePipelineTester*)LLMetricPerformanceTesterBasic::getTester(sTesterName);
	if (tester)
	{
		tester->updateTextureBindingStats(this);
	}
}

//----------------------------------------------------------------------------------------------
//end of LLViewerTexture
//----------------------------------------------------------------------------------------------

const std::string& fttype_to_string(const FTType& fttype)
{
	static const std::string ftt_unknown("FTT_UNKNOWN");
	static const std::string ftt_default("FTT_DEFAULT");
	static const std::string ftt_server_bake("FTT_SERVER_BAKE");
	static const std::string ftt_host_bake("FTT_HOST_BAKE");
	static const std::string ftt_map_tile("FTT_MAP_TILE");
	static const std::string ftt_local_file("FTT_LOCAL_FILE");
	static const std::string ftt_error("FTT_ERROR");
	switch(fttype)
	{
		case FTT_UNKNOWN: return ftt_unknown; break;
		case FTT_DEFAULT: return ftt_default; break;
		case FTT_SERVER_BAKE: return ftt_server_bake; break;
		case FTT_HOST_BAKE: return ftt_host_bake; break;
		case FTT_MAP_TILE: return ftt_map_tile; break;
		case FTT_LOCAL_FILE: return ftt_local_file; break;
	}
	return ftt_error;
}

//----------------------------------------------------------------------------------------------
//start of LLViewerFetchedTexture
//----------------------------------------------------------------------------------------------

//static 
LLViewerFetchedTexture* LLViewerFetchedTexture::getSmokeImage()
{
    if (sSmokeImagep.isNull())
    {
        sSmokeImagep = LLViewerTextureManager::getFetchedTexture(IMG_SMOKE);
    }

    sSmokeImagep->addTextureStats(1024.f * 1024.f);

    return sSmokeImagep;
}

LLViewerFetchedTexture::LLViewerFetchedTexture(const LLUUID& id, FTType f_type, const LLHost& host, BOOL usemipmaps)
	: LLViewerTexture(id, usemipmaps),
	mTargetHost(host)
{
	init(TRUE);
	mFTType = f_type;
	if (mFTType == FTT_HOST_BAKE)
	{
		LL_WARNS() << "Unsupported fetch type " << mFTType << LL_ENDL;
	}
	generateGLTexture();
}
	
LLViewerFetchedTexture::LLViewerFetchedTexture(const LLImageRaw* raw, FTType f_type, BOOL usemipmaps)
	: LLViewerTexture(raw, usemipmaps)
{
	init(TRUE);
	mFTType = f_type;
}
	
LLViewerFetchedTexture::LLViewerFetchedTexture(const std::string& url, FTType f_type, const LLUUID& id, BOOL usemipmaps)
	: LLViewerTexture(id, usemipmaps),
	mUrl(url)
{
	init(TRUE);
	mFTType = f_type;
	generateGLTexture();
}

void LLViewerFetchedTexture::init(bool firstinit)
{
	mOrigWidth = 0;
	mOrigHeight = 0;
	mHasAux = FALSE;
	mNeedsAux = FALSE;
	mRequestedDiscardLevel = -1;
	mRequestedDownloadPriority = 0.f;
	mFullyLoaded = FALSE;
	mCanUseHTTP = true;
	mDesiredDiscardLevel = MAX_DISCARD_LEVEL + 1;
	mMinDesiredDiscardLevel = MAX_DISCARD_LEVEL + 1;
	
	mDecodingAux = FALSE;

	mKnownDrawWidth = 0;
	mKnownDrawHeight = 0;
	mKnownDrawSizeChanged = FALSE;

	if (firstinit)
	{
		mInImageList = 0;
	}

	// Only set mIsMissingAsset true when we know for certain that the database
	// does not contain this image.
	mIsMissingAsset = FALSE;

	mLoadedCallbackDesiredDiscardLevel = S8_MAX;
	mPauseLoadedCallBacks = FALSE;

	mNeedsCreateTexture = FALSE;
	
	mIsRawImageValid = FALSE;
	mRawDiscardLevel = INVALID_DISCARD_LEVEL;
	mMinDiscardLevel = 0;

	mHasFetcher = FALSE;
	mIsFetching = FALSE;
	mFetchState = 0;
	mFetchPriority = 0;
	mDownloadProgress = 0.f;
	mFetchDeltaTime = 999999.f;
	mRequestDeltaTime = 0.f;
	mForSculpt = FALSE;
	mIsFetched = FALSE;
	mInFastCacheList = FALSE;

	mCachedRawImage = NULL;
	mCachedRawDiscardLevel = -1;
	mCachedRawImageReady = FALSE;

	mSavedRawImage = NULL;
	mForceToSaveRawImage  = FALSE;
	mSaveRawImage = FALSE;
	mSavedRawDiscardLevel = -1;
	mDesiredSavedRawDiscardLevel = -1;
	mLastReferencedSavedRawImageTime = 0.0f;
	mKeptSavedRawImageTime = 0.f;
	mLastCallBackActiveTime = 0.f;
	mForceCallbackFetch = FALSE;
	mInDebug = FALSE;
	mUnremovable = FALSE;

	mFTType = FTT_UNKNOWN;
}

LLViewerFetchedTexture::~LLViewerFetchedTexture()
{
    assert_main_thread();
	//*NOTE getTextureFetch can return NULL when Viewer is shutting down.
	// This is due to LLWearableList is singleton and is destroyed after 
	// LLAppViewer::cleanup() was called. (see ticket EXT-177)
	if (mHasFetcher && LLAppViewer::getTextureFetch())
	{
		LLAppViewer::getTextureFetch()->deleteRequest(getID(), true);
	}
	cleanup();	
}

//virtual 
S8 LLViewerFetchedTexture::getType() const
{
	return LLViewerTexture::FETCHED_TEXTURE;
}

FTType LLViewerFetchedTexture::getFTType() const
{
	return mFTType;
}

void LLViewerFetchedTexture::cleanup()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	for(callback_list_t::iterator iter = mLoadedCallbackList.begin();
		iter != mLoadedCallbackList.end(); )
	{
		LLLoadedCallbackEntry *entryp = *iter++;
		// We never finished loading the image.  Indicate failure.
		// Note: this allows mLoadedCallbackUserData to be cleaned up.
		entryp->mCallback( FALSE, this, NULL, NULL, 0, TRUE, entryp->mUserData );
		entryp->removeTexture(this);
		delete entryp;
	}
	mLoadedCallbackList.clear();
	mNeedsAux = FALSE;
	
	// Clean up image data
	destroyRawImage();
	mCachedRawImage = NULL;
	mCachedRawDiscardLevel = -1;
	mCachedRawImageReady = FALSE;
	mSavedRawImage = NULL;
	mSavedRawDiscardLevel = -1;
}

//access the fast cache
void LLViewerFetchedTexture::loadFromFastCache()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if(!mInFastCacheList)
	{
		return; //no need to access the fast cache.
	}
	mInFastCacheList = FALSE;

    add(LLTextureFetch::sCacheAttempt, 1.0);

    LLTimer fastCacheTimer;
	mRawImage = LLAppViewer::getTextureCache()->readFromFastCache(getID(), mRawDiscardLevel);
	if(mRawImage.notNull())
	{
        F32 cachReadTime = fastCacheTimer.getElapsedTimeF32();

        add(LLTextureFetch::sCacheHit, 1.0);
        record(LLTextureFetch::sCacheHitRate, LLUnits::Ratio::fromValue(1));
        sample(LLTextureFetch::sCacheReadLatency, cachReadTime);

		mFullWidth = mRawImage->getWidth() << mRawDiscardLevel;
		mFullHeight = mRawImage->getHeight() << mRawDiscardLevel;
		setTexelsPerImage();

		if(mFullWidth > MAX_IMAGE_SIZE || mFullHeight > MAX_IMAGE_SIZE)
		{ 
			//discard all oversized textures.
			destroyRawImage();
			LL_WARNS() << "oversized, setting as missing" << LL_ENDL;
			setIsMissingAsset();
			mRawDiscardLevel = INVALID_DISCARD_LEVEL;
		}
		else
		{
            if (mBoostLevel == LLGLTexture::BOOST_ICON)
            {
                // Shouldn't do anything usefull since texures in fast cache are 16x16,
                // it is here in case fast cache changes.
                S32 expected_width = mKnownDrawWidth > 0 ? mKnownDrawWidth : DEFAULT_ICON_DIMENTIONS;
                S32 expected_height = mKnownDrawHeight > 0 ? mKnownDrawHeight : DEFAULT_ICON_DIMENTIONS;
                if (mRawImage && (mRawImage->getWidth() > expected_width || mRawImage->getHeight() > expected_height))
                {
                    // scale oversized icon, no need to give more work to gl
                    mRawImage->scale(expected_width, expected_height);
                }
            }

			mRequestedDiscardLevel = mDesiredDiscardLevel + 1;
			mIsRawImageValid = TRUE;			
			addToCreateTexture();
		}
	}
    else
    {
        record(LLTextureFetch::sCacheHitRate, LLUnits::Ratio::fromValue(0));
    }
}

void LLViewerFetchedTexture::setForSculpt()
{
	static const S32 MAX_INTERVAL = 8; //frames

	mForSculpt = TRUE;
	if(isForSculptOnly() && hasGLTexture() && !getBoundRecently())
	{
		destroyGLTexture(); //sculpt image does not need gl texture.
		mTextureState = ACTIVE;
	}
	checkCachedRawSculptImage();
	setMaxVirtualSizeResetInterval(MAX_INTERVAL);
}

BOOL LLViewerFetchedTexture::isForSculptOnly() const
{
	return mForSculpt && !mNeedsGLTexture;
}

BOOL LLViewerFetchedTexture::isDeleted()  
{ 
	return mTextureState == DELETED; 
}

BOOL LLViewerFetchedTexture::isInactive()  
{ 
	return mTextureState == INACTIVE; 
}

BOOL LLViewerFetchedTexture::isDeletionCandidate()  
{ 
	return mTextureState == DELETION_CANDIDATE; 
}

void LLViewerFetchedTexture::setDeletionCandidate()  
{ 
	if(mGLTexturep.notNull() && mGLTexturep->getTexName() && (mTextureState == INACTIVE))
	{
		mTextureState = DELETION_CANDIDATE;		
	}
}

//set the texture inactive
void LLViewerFetchedTexture::setInactive()
{
	if(mTextureState == ACTIVE && mGLTexturep.notNull() && mGLTexturep->getTexName() && !mGLTexturep->getBoundRecently())
	{
		mTextureState = INACTIVE; 
	}
}

BOOL LLViewerFetchedTexture::isFullyLoaded() const
{
	// Unfortunately, the boolean "mFullyLoaded" is never updated correctly so we use that logic
	// to check if the texture is there and completely downloaded
	return (mFullWidth != 0) && (mFullHeight != 0) && !mIsFetching && !mHasFetcher;
}


// virtual
void LLViewerFetchedTexture::dump()
{
	LLViewerTexture::dump();

	LL_INFOS() << "Dump : " << mID 
			<< ", mIsMissingAsset = " << (S32)mIsMissingAsset
			<< ", mFullWidth = " << (S32)mFullWidth
			<< ", mFullHeight = " << (S32)mFullHeight
			<< ", mOrigWidth = " << (S32)mOrigWidth
			<< ", mOrigHeight = " << (S32)mOrigHeight
			<< LL_ENDL;
	LL_INFOS() << "     : " 
			<< " mFullyLoaded = " << (S32)mFullyLoaded
			<< ", mFetchState = " << (S32)mFetchState
			<< ", mFetchPriority = " << (S32)mFetchPriority
			<< ", mDownloadProgress = " << (F32)mDownloadProgress
			<< LL_ENDL;
	LL_INFOS() << "     : " 
			<< " mHasFetcher = " << (S32)mHasFetcher
			<< ", mIsFetching = " << (S32)mIsFetching
			<< ", mIsFetched = " << (S32)mIsFetched
			<< ", mBoostLevel = " << (S32)mBoostLevel
			<< LL_ENDL;
}

///////////////////////////////////////////////////////////////////////////////
// ONLY called from LLViewerFetchedTextureList
void LLViewerFetchedTexture::destroyTexture() 
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;

	if (mNeedsCreateTexture)//return if in the process of generating a new texture.
	{
		return;
	}

	//LL_DEBUGS("Avatar") << mID << LL_ENDL;
	destroyGLTexture();
	mFullyLoaded = FALSE;
}

void LLViewerFetchedTexture::addToCreateTexture()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	bool force_update = false;
	if (getComponents() != mRawImage->getComponents())
	{
		// We've changed the number of components, so we need to move any
		// objects using this pool to a different pool.
		mComponents = mRawImage->getComponents();
		mGLTexturep->setComponents(mComponents);
		force_update = true;

		for (U32 j = 0; j < LLRender::NUM_TEXTURE_CHANNELS; ++j)
		{
			llassert(mNumFaces[j] <= mFaceList[j].size());

			for(U32 i = 0; i < mNumFaces[j]; i++)
			{
				mFaceList[j][i]->dirtyTexture();
			}
		}

		//discard the cached raw image and the saved raw image
		mCachedRawImageReady = FALSE;
		mCachedRawDiscardLevel = -1;
		mCachedRawImage = NULL;
		mSavedRawDiscardLevel = -1;
		mSavedRawImage = NULL;
	}	

	if(isForSculptOnly())
	{
		//just update some variables, not to create a real GL texture.
		createGLTexture(mRawDiscardLevel, mRawImage, 0, FALSE);
		mNeedsCreateTexture = FALSE;
		destroyRawImage();
	}
	else if(!force_update && getDiscardLevel() > -1 && getDiscardLevel() <= mRawDiscardLevel)
	{
		mNeedsCreateTexture = FALSE;
		destroyRawImage();
	}
	else
	{	
        LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
#if 1
		//
		//if mRequestedDiscardLevel > mDesiredDiscardLevel, we assume the required image res keep going up,
		//so do not scale down the over qualified image.
		//Note: scaling down image is expensensive. Do it only when very necessary.
		//
		if(mRequestedDiscardLevel <= mDesiredDiscardLevel && !mForceToSaveRawImage)
		{
			S32 w = mFullWidth >> mRawDiscardLevel;
			S32 h = mFullHeight >> mRawDiscardLevel;

			//if big image, do not load extra data
			//scale it down to size >= LLViewerTexture::sMinLargeImageSize
			if(w * h > LLViewerTexture::sMinLargeImageSize)
			{
				S32 d_level = llmin(mRequestedDiscardLevel, (S32)mDesiredDiscardLevel) - mRawDiscardLevel;
				
				if(d_level > 0)
				{
					S32 i = 0;
					while((d_level > 0) && ((w >> i) * (h >> i) > LLViewerTexture::sMinLargeImageSize))
					{
						i++;
						d_level--;
					}
					if(i > 0)
					{
						mRawDiscardLevel += i;
						if(mRawDiscardLevel >= getDiscardLevel() && getDiscardLevel() > 0)
						{
							mNeedsCreateTexture = FALSE;
							destroyRawImage();
							return;
						}

						{
							//make a duplicate in case somebody else is using this raw image
							mRawImage = mRawImage->scaled(w >> i, h >> i);
						}
					}
				}
			}
		}
#endif
        scheduleCreateTexture();
	}
	return;
}

// ONLY called from LLViewerTextureList
BOOL LLViewerFetchedTexture::preCreateTexture(S32 usename/*= 0*/)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
#if LL_IMAGEGL_THREAD_CHECK
    mGLTexturep->checkActiveThread();
#endif

    if (!mNeedsCreateTexture)
    {
        destroyRawImage();
        return FALSE;
    }
    mNeedsCreateTexture = FALSE;

    if (mRawImage.isNull())
    {
        LL_ERRS() << "LLViewerTexture trying to create texture with no Raw Image" << LL_ENDL;
    }
    if (mRawImage->isBufferInvalid())
    {
        LL_WARNS() << "Can't create a texture: invalid image data" << LL_ENDL;
        destroyRawImage();
        return FALSE;
    }
    // 	LL_INFOS() << llformat("IMAGE Creating (%d) [%d x %d] Bytes: %d ",
    // 						mRawDiscardLevel, 
    // 						mRawImage->getWidth(), mRawImage->getHeight(),mRawImage->getDataSize())
    // 			<< mID.getString() << LL_ENDL;
    BOOL res = TRUE;

    // store original size only for locally-sourced images
    if (mUrl.compare(0, 7, "file://") == 0)
    {
        mOrigWidth = mRawImage->getWidth();
        mOrigHeight = mRawImage->getHeight();

        // This is only safe because it's a local image and fetcher doesn't use raw data
        // from local images, but this might become unsafe in case of changes to fetcher
        if (mBoostLevel == BOOST_PREVIEW)
        {
            mRawImage->biasedScaleToPowerOfTwo(1024);
        }
        else
        { // leave black border, do not scale image content
            mRawImage->expandToPowerOfTwo(MAX_IMAGE_SIZE, FALSE);
        }

        mFullWidth = mRawImage->getWidth();
        mFullHeight = mRawImage->getHeight();
        setTexelsPerImage();
    }
    else
    {
        mOrigWidth = mFullWidth;
        mOrigHeight = mFullHeight;
    }

    bool size_okay = true;

    S32 discard_level = mRawDiscardLevel;
    if (mRawDiscardLevel < 0)
    {
        LL_DEBUGS() << "Negative raw discard level when creating image: " << mRawDiscardLevel << LL_ENDL;
        discard_level = 0;
    }

    U32 raw_width = mRawImage->getWidth() << discard_level;
    U32 raw_height = mRawImage->getHeight() << discard_level;

    if (raw_width > MAX_IMAGE_SIZE || raw_height > MAX_IMAGE_SIZE)
    {
        LL_INFOS() << "Width or height is greater than " << MAX_IMAGE_SIZE << ": (" << raw_width << "," << raw_height << ")" << LL_ENDL;
        size_okay = false;
    }

    if (!LLImageGL::checkSize(mRawImage->getWidth(), mRawImage->getHeight()))
    {
        // A non power-of-two image was uploaded (through a non standard client)
        LL_INFOS() << "Non power of two width or height: (" << mRawImage->getWidth() << "," << mRawImage->getHeight() << ")" << LL_ENDL;
        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
        LL_WARNS() << "!size_ok, setting as missing" << LL_ENDL;
        setIsMissingAsset();
        destroyRawImage();
        return FALSE;
    }

    if (mGLTexturep->getHasExplicitFormat())
    {
        LLGLenum format = mGLTexturep->getPrimaryFormat();
        S8 components = mRawImage->getComponents();
        if ((format == GL_RGBA && components < 4)
            || (format == GL_RGB && components < 3))
        {
            LL_WARNS() << "Can't create a texture " << mID << ": invalid image format " << std::hex << format << " vs components " << (U32)components << LL_ENDL;
            // Was expecting specific format but raw texture has insufficient components for
            // such format, using such texture will result in crash or will display wrongly
            // if we change format. Texture might be corrupted server side, so just set as
            // missing and clear cashed texture (do not cause reload loop, will retry&recover
            // during new session)
            setIsMissingAsset();
            destroyRawImage();
            LLAppViewer::getTextureCache()->removeFromCache(mID);
            return FALSE;
        }
    }

    return res;
}

BOOL LLViewerFetchedTexture::createTexture(S32 usename/*= 0*/)
{
    if (!mNeedsCreateTexture)
    {
        return FALSE;
    }

	BOOL res = mGLTexturep->createGLTexture(mRawDiscardLevel, mRawImage, usename, TRUE, mBoostLevel);
    
	return res;
}

void LLViewerFetchedTexture::postCreateTexture()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
    if (!mNeedsCreateTexture)
    {
        return;
    }
#if LL_IMAGEGL_THREAD_CHECK
    mGLTexturep->checkActiveThread();
#endif

    setActive();

    if (!needsToSaveRawImage())
    {
        mNeedsAux = FALSE;
        destroyRawImage();
    }

    mNeedsCreateTexture = FALSE;
}

void LLViewerFetchedTexture::scheduleCreateTexture()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;

    if (!mNeedsCreateTexture)
    {
        mNeedsCreateTexture = TRUE;
        if (preCreateTexture())
        {
#if LL_IMAGEGL_THREAD_CHECK
            //grab a copy of the raw image data to make sure it isn't modified pending texture creation
            U8* data = mRawImage->getData();
            U8* data_copy = nullptr;
            S32 size = mRawImage->getDataSize();
            if (data != nullptr && size > 0)
            {
                data_copy = new U8[size];
                memcpy(data_copy, data, size);
            }
#endif
            mNeedsCreateTexture = TRUE;
            auto mainq = LLImageGLThread::sEnabled ? mMainQueue.lock() : nullptr;
            if (mainq)
            {
                ref();
                mainq->postTo(
                    mImageQueue,
                    // work to be done on LLImageGL worker thread
#if LL_IMAGEGL_THREAD_CHECK
                    [this, data, data_copy, size]()
                    {
                        mGLTexturep->mActiveThread = LLThread::currentID();
                        //verify data is unmodified
                        llassert(data == mRawImage->getData());
                        llassert(mRawImage->getDataSize() == size);
                        llassert(memcmp(data, data_copy, size) == 0);
#else
                    [this]()
                    {
#endif
                        //actually create the texture on a background thread
                        createTexture();

#if LL_IMAGEGL_THREAD_CHECK
                        //verify data is unmodified
                        llassert(data == mRawImage->getData());
                        llassert(mRawImage->getDataSize() == size);
                        llassert(memcmp(data, data_copy, size) == 0);
#endif
                    },
                    // callback to be run on main thread
#if LL_IMAGEGL_THREAD_CHECK
                        [this, data, data_copy, size]()
                    {
                        mGLTexturep->mActiveThread = LLThread::currentID();
                        llassert(data == mRawImage->getData());
                        llassert(mRawImage->getDataSize() == size);
                        llassert(memcmp(data, data_copy, size) == 0);
                        delete[] data_copy;
#else
                        [this]()
                        {
#endif
                        //finalize on main thread
                        postCreateTexture();
                        unref();
                    });
            }
            else
            {
                gTextureList.mCreateTextureList.insert(this);
            }
        }
    }
}

// Call with 0,0 to turn this feature off.
//virtual
void LLViewerFetchedTexture::setKnownDrawSize(S32 width, S32 height)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if(mKnownDrawWidth < width || mKnownDrawHeight < height)
	{
		mKnownDrawWidth = llmax(mKnownDrawWidth, width);
		mKnownDrawHeight = llmax(mKnownDrawHeight, height);

		mKnownDrawSizeChanged = TRUE;
		mFullyLoaded = FALSE;
	}
	addTextureStats((F32)(mKnownDrawWidth * mKnownDrawHeight));
}

void LLViewerFetchedTexture::setDebugText(const std::string& text)
{
    for (U32 ch = 0; ch < LLRender::NUM_TEXTURE_CHANNELS; ++ch)
    {
        llassert(mNumFaces[ch] <= mFaceList[ch].size());

        for (U32 i = 0; i < mNumFaces[ch]; i++)
        {
            LLFace* facep = mFaceList[ch][i];
            if (facep)
            {
                LLDrawable* drawable = facep->getDrawable();
                if (drawable)
                {
                    drawable->getVObj()->setDebugText(text);
                }
            }
        }
    }
}

//virtual
void LLViewerFetchedTexture::processTextureStats()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if(mFullyLoaded)
	{		
		if(mDesiredDiscardLevel > mMinDesiredDiscardLevel)//need to load more
		{
			mDesiredDiscardLevel = llmin(mDesiredDiscardLevel, mMinDesiredDiscardLevel);
			mFullyLoaded = FALSE;
		}
        //setDebugText("fully loaded");
	}
	else
	{
		updateVirtualSize();
		
		static LLCachedControl<bool> textures_fullres(gSavedSettings,"TextureLoadFullRes", false);
		
		if (textures_fullres)
		{
			mDesiredDiscardLevel = 0;
		}
		else if (!LLPipeline::sRenderDeferred && mBoostLevel == LLGLTexture::BOOST_ALM)
		{ // ??? don't load spec and normal maps when alm is disabled ???
			mDesiredDiscardLevel = MAX_DISCARD_LEVEL + 1;
		}
        else if (mDontDiscard && mBoostLevel == LLGLTexture::BOOST_ICON)
        {
            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 if(!mFullWidth || !mFullHeight)
		{
			mDesiredDiscardLevel = 	llmin(getMaxDiscardLevel(), (S32)mLoadedCallbackDesiredDiscardLevel);
		}
		else
		{
			U32 desired_size = MAX_IMAGE_SIZE_DEFAULT; // MAX_IMAGE_SIZE_DEFAULT = 1024 and max size ever is 2048
			if(!mKnownDrawWidth || !mKnownDrawHeight || mFullWidth <= mKnownDrawWidth || mFullHeight <= mKnownDrawHeight)
			{
				if (mFullWidth > desired_size || mFullHeight > desired_size)
				{
					mDesiredDiscardLevel = 1;
				}
				else
				{
					mDesiredDiscardLevel = 0;
				}
			}
			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.
	{
		mDesiredDiscardLevel = llmin(mDesiredDiscardLevel, (S8)mDesiredSavedRawDiscardLevel);
		if(getDiscardLevel() < 0 || getDiscardLevel() > mDesiredDiscardLevel)
		{
			mFullyLoaded = FALSE;
		}
	}
}

//============================================================================

void LLViewerFetchedTexture::updateVirtualSize() 
{	
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	reorganizeFaceList();
	reorganizeVolumeList();
}

S32 LLViewerFetchedTexture::getCurrentDiscardLevelForFetching()
{
	S32 current_discard = getDiscardLevel();
	if(mForceToSaveRawImage)
	{
		if(mSavedRawDiscardLevel < 0 || current_discard < 0)
		{
			current_discard = -1;
		}
		else
		{
			current_discard = llmax(current_discard, mSavedRawDiscardLevel);
		}		
	}

	return current_discard;
}

bool LLViewerFetchedTexture::setDebugFetching(S32 debug_level)
{
	if(debug_level < 0)
	{
		mInDebug = FALSE;
		return false;
	}
	mInDebug = TRUE;

	mDesiredDiscardLevel = debug_level;	

	return true;
}

bool LLViewerFetchedTexture::isActiveFetching()
{
	static LLCachedControl<bool> monitor_enabled(gSavedSettings,"DebugShowTextureInfo");

	return mFetchState > 7 && mFetchState < 10 && monitor_enabled; //in state of WAIT_HTTP_REQ or DECODE_IMAGE.
}

void LLViewerFetchedTexture::setBoostLevel(S32 level)
{
    LLViewerTexture::setBoostLevel(level);

    if (level >= LLViewerTexture::BOOST_HIGH)
    {
        mDesiredDiscardLevel = 0;
    }
}

bool LLViewerFetchedTexture::updateFetch()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	static LLCachedControl<bool> textures_decode_disabled(gSavedSettings,"TextureDecodeDisabled", false);
	static LLCachedControl<F32>  sCameraMotionThreshold(gSavedSettings,"TextureCameraMotionThreshold", 0.2);
	static LLCachedControl<S32>  sCameraMotionBoost(gSavedSettings,"TextureCameraMotionBoost", 3);
	if(textures_decode_disabled) // don't fetch the surface textures in wireframe mode
	{
		return false;
	}

	mFetchState = 0;
	mFetchPriority = 0;
	mFetchDeltaTime = 999999.f;
	mRequestDeltaTime = 999999.f;

#ifndef LL_RELEASE_FOR_DOWNLOAD
	if (mID == LLAppViewer::getTextureFetch()->mDebugID)
	{
		LLAppViewer::getTextureFetch()->mDebugCount++; // for setting breakpoints
	}
#endif

	if (mNeedsCreateTexture)
	{
        LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - needs create");
		// We may be fetching still (e.g. waiting on write)
		// but don't check until we've processed the raw data we have
		return false;
	}
	if (mIsMissingAsset)
	{
        LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - missing asset");
		llassert_always(!mHasFetcher);
		return false; // skip
	}
	if (!mLoadedCallbackList.empty() && mRawImage.notNull())
	{
        LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - callback pending");
		return false; // process any raw image data in callbacks before replacing
	}
	if(mInFastCacheList)
	{
        LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - in fast cache");
		return false;
	}
    if (mGLTexturep.isNull())
    { // fix for crash inside getCurrentDiscardLevelForFetching (shouldn't happen but appears to be happening)
        llassert(false);
        return false;
    }
	
	S32 current_discard = getCurrentDiscardLevelForFetching();
	S32 desired_discard = getDesiredDiscardLevel();
	F32 decode_priority = mMaxVirtualSize;

	if (mIsFetching)
	{
        LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - is fetching");
		// Sets mRawDiscardLevel, mRawImage, mAuxRawImage
		S32 fetch_discard = current_discard;
		
		if (mRawImage.notNull()) sRawCount--;
		if (mAuxRawImage.notNull()) sAuxCount--;
		// keep in mind that fetcher still might need raw image, don't modify original
		bool finished = LLAppViewer::getTextureFetch()->getRequestFinished(getID(), fetch_discard, mRawImage, mAuxRawImage,
																		   mLastHttpGetStatus);
		if (mRawImage.notNull()) sRawCount++;
		if (mAuxRawImage.notNull())
		{
			mHasAux = TRUE;
			sAuxCount++;
		}
		if (finished)
		{
			mIsFetching = FALSE;
            mLastFetchState = -1;
            setDebugText("");
			mLastPacketTimer.reset();
		}
		else
		{
			mFetchState = LLAppViewer::getTextureFetch()->getFetchState(mID, mDownloadProgress, mRequestedDownloadPriority,
																		mFetchPriority, mFetchDeltaTime, mRequestDeltaTime, mCanUseHTTP);
            /*if (mFetchState != mLastFetchState)
            {
                setDebugText(LLTextureFetch::getStateString(mFetchState));
                mLastFetchState = mFetchState;
            }*/
		}
		
		// We may have data ready regardless of whether or not we are finished (e.g. waiting on write)
		if (mRawImage.notNull())
		{
            LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - has raw image");
			LLTexturePipelineTester* tester = (LLTexturePipelineTester*)LLMetricPerformanceTesterBasic::getTester(sTesterName);
			if (tester)
			{
				mIsFetched = TRUE;
				tester->updateTextureLoadingStats(this, mRawImage, LLAppViewer::getTextureFetch()->isFromLocalCache(mID));
			}
			mRawDiscardLevel = fetch_discard;
			if ((mRawImage->getDataSize() > 0 && mRawDiscardLevel >= 0) &&
				(current_discard < 0 || mRawDiscardLevel < current_discard))
			{
                LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - data good");
				mFullWidth = mRawImage->getWidth() << mRawDiscardLevel;
				mFullHeight = mRawImage->getHeight() << mRawDiscardLevel;
				setTexelsPerImage();

				if(mFullWidth > MAX_IMAGE_SIZE || mFullHeight > MAX_IMAGE_SIZE)
				{ 
					//discard all oversized textures.
					destroyRawImage();
					LL_WARNS() << "oversize, setting as missing" << LL_ENDL;
					setIsMissingAsset();
					mRawDiscardLevel = INVALID_DISCARD_LEVEL;
					mIsFetching = FALSE;
					mLastPacketTimer.reset();
				}
				else
				{
					mIsRawImageValid = TRUE;
					addToCreateTexture();
				}

                if (mBoostLevel == LLGLTexture::BOOST_ICON)
                {
                    S32 expected_width = mKnownDrawWidth > 0 ? mKnownDrawWidth : DEFAULT_ICON_DIMENTIONS;
                    S32 expected_height = mKnownDrawHeight > 0 ? mKnownDrawHeight : DEFAULT_ICON_DIMENTIONS;
                    if (mRawImage && (mRawImage->getWidth() > expected_width || mRawImage->getHeight() > expected_height))
                    {
                        // scale oversized icon, no need to give more work to gl
                        // since we got mRawImage from thread worker and image may be in use (ex: writing cache), make a copy
                        mRawImage = mRawImage->scaled(expected_width, expected_height);
                    }
                }

				return TRUE;
			}
			else
			{
                LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - data not needed");
				// Data is ready but we don't need it
				// (received it already while fetcher was writing to disk)
				destroyRawImage();
				return false; // done
			}
		}
		
		if (!mIsFetching)
		{
			if ((decode_priority > 0) && (mRawDiscardLevel < 0 || mRawDiscardLevel == INVALID_DISCARD_LEVEL))
			{
				// We finished but received no data
				if (getDiscardLevel() < 0)
				{
					if (getFTType() != FTT_MAP_TILE)
					{
						LL_WARNS() << mID
								<< " Fetch failure, setting as missing, decode_priority " << decode_priority
								<< " mRawDiscardLevel " << mRawDiscardLevel
								<< " current_discard " << current_discard
								<< " stats " << mLastHttpGetStatus.toHex()
								<< LL_ENDL;
					}
					setIsMissingAsset();
					desired_discard = -1;
				}
				else
				{
					//LL_WARNS() << mID << ": Setting min discard to " << current_discard << LL_ENDL;
					if(current_discard >= 0)
					{
						mMinDiscardLevel = current_discard;
						//desired_discard = current_discard;
					}
					else
					{
						S32 dis_level = getDiscardLevel();
						mMinDiscardLevel = dis_level;
						//desired_discard = dis_level;
					}
				}
				destroyRawImage();
			}
			else if (mRawImage.notNull())
			{
				// We have data, but our fetch failed to return raw data
				// *TODO: FIgure out why this is happening and fix it
				destroyRawImage();
			}
		}
		else
		{
			static const F32 MAX_HOLD_TIME = 5.0f; //seconds to wait before canceling fecthing if decode_priority is 0.f.
			if(decode_priority > 0.0f || mStopFetchingTimer.getElapsedTimeF32() > MAX_HOLD_TIME)
			{
				mStopFetchingTimer.reset();
				LLAppViewer::getTextureFetch()->updateRequestPriority(mID, decode_priority);
			}
		}
	}

    desired_discard = llmin(desired_discard, getMaxDiscardLevel());

	bool make_request = true;	
	if (decode_priority <= 0)
	{
        LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - priority <= 0");
		make_request = false;
	}
	else if(mDesiredDiscardLevel > getMaxDiscardLevel())
	{
        LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - desired > max");
		make_request = false;
	}
	else  if (mNeedsCreateTexture || mIsMissingAsset)
	{
        LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - create or missing");
		make_request = false;
	}
	else if (current_discard >= 0 && current_discard <= mMinDiscardLevel)
	{
        LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - current < min");
		make_request = false;
	}
	else if(mCachedRawImage.notNull() // can be empty
			&& mCachedRawImageReady
			&& (current_discard < 0 || current_discard > mCachedRawDiscardLevel))
	{
		make_request = false;
		switchToCachedImage(); //use the cached raw data first
	}
	//else if (!isJustBound() && mCachedRawImageReady)
	//{
	//	make_request = false;
	//}
	
	if (make_request)
	{
#if 0
		// Load the texture progressively: we try not to rush to the desired discard too fast.
		// If the camera is not moving, we do not tweak the discard level notch by notch but go to the desired discard with larger boosted steps
		// This mitigates the "textures stay blurry" problem when loading while not killing the texture memory while moving around
		S32 delta_level = (mBoostLevel > LLGLTexture::BOOST_ALM) ? 2 : 1; 
		if (current_discard < 0)
		{
			desired_discard = llmax(desired_discard, getMaxDiscardLevel() - delta_level);
		}
		else if (LLViewerTexture::sCameraMovingBias < sCameraMotionThreshold)
		{
			desired_discard = llmax(desired_discard, current_discard - sCameraMotionBoost);
		}
        else
        {
			desired_discard = llmax(desired_discard, current_discard - delta_level);
        }
#endif

		if (mIsFetching)
		{
            // already requested a higher resolution mip
			if (mRequestedDiscardLevel <= desired_discard)
			{
                LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - requested < desired");
				make_request = false;
			}
		}
		else
		{
            // already at a higher resolution mip, don't discard
			if (current_discard >= 0 && current_discard <= desired_discard)
			{
                LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - current <= desired");
				make_request = false;
			}
		}
	}
	
	if (make_request)
	{
        LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - make request");
		S32 w=0, h=0, c=0;
		if (getDiscardLevel() >= 0)
		{
			w = mGLTexturep->getWidth(0);
			h = mGLTexturep->getHeight(0);
			c = mComponents;
		}

		const U32 override_tex_discard_level = gSavedSettings.getU32("TextureDiscardLevel");
		if (override_tex_discard_level != 0)
		{
			desired_discard = override_tex_discard_level;
		}
		
		// bypass texturefetch directly by pulling from LLTextureCache
		S32 fetch_request_discard = -1;
        fetch_request_discard = LLAppViewer::getTextureFetch()->createRequest(mFTType, mUrl, getID(), getTargetHost(), decode_priority,
																			  w, h, c, desired_discard, needsAux(), mCanUseHTTP);
		
		if (fetch_request_discard >= 0)
		{
            LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("vftuf - request created");
			mHasFetcher = TRUE;
			mIsFetching = TRUE;
            // in some cases createRequest can modify discard, as an example
            // bake textures are always at discard 0
            mRequestedDiscardLevel = llmin(desired_discard, fetch_request_discard);
			mFetchState = LLAppViewer::getTextureFetch()->getFetchState(mID, mDownloadProgress, mRequestedDownloadPriority,
													   mFetchPriority, mFetchDeltaTime, mRequestDeltaTime, mCanUseHTTP);
		}

        // If createRequest() failed, that means one of two things:
        // 1. We're finishing up a request for this UUID, so we
        //    should wait for it to complete
        // 2. We've failed a request for this UUID, so there is
        //    no need to create another request
	}
	else if (mHasFetcher && !mIsFetching)
	{
		// Only delete requests that haven't received any network data
		// for a while.  Note - this is the normal mechanism for
		// deleting requests, not just a place to handle timeouts.
		const F32 FETCH_IDLE_TIME = 0.1f;
		if (mLastPacketTimer.getElapsedTimeF32() > FETCH_IDLE_TIME)
		{
 			LL_DEBUGS("Texture") << "exceeded idle time " << FETCH_IDLE_TIME << ", deleting request: " << getID() << LL_ENDL;
			LLAppViewer::getTextureFetch()->deleteRequest(getID(), true);
			mHasFetcher = FALSE;
		}
	}
	
	llassert_always(mRawImage.notNull() || (!mNeedsCreateTexture && !mIsRawImageValid));
	
	return mIsFetching ? true : false;
}

void LLViewerFetchedTexture::clearFetchedResults()
{
	if(mNeedsCreateTexture || mIsFetching)
	{
		return;
	}
	
	cleanup();
	destroyGLTexture();

	if(getDiscardLevel() >= 0) //sculpty texture, force to invalidate
	{
		mGLTexturep->forceToInvalidateGLTexture();
	}
}

void LLViewerFetchedTexture::forceToDeleteRequest()
{
	if (mHasFetcher)
	{
		mHasFetcher = FALSE;
		mIsFetching = FALSE;
	}
		
	resetTextureStats();

	mDesiredDiscardLevel = getMaxDiscardLevel() + 1;
}

void LLViewerFetchedTexture::setIsMissingAsset(BOOL is_missing)
{
	if (is_missing == mIsMissingAsset)
	{
		return;
	}
	if (is_missing)
	{
		if (mUrl.empty())
		{
			LL_WARNS() << mID << ": Marking image as missing" << LL_ENDL;
		}
		else
		{
			// This may or may not be an error - it is normal to have no
			// map tile on an empty region, but bad if we're failing on a
			// server bake texture.
			if (getFTType() != FTT_MAP_TILE)
			{
				LL_WARNS() << mUrl << ": Marking image as missing" << LL_ENDL;
			}
		}
		if (mHasFetcher)
		{
			LLAppViewer::getTextureFetch()->deleteRequest(getID(), true);
			mHasFetcher = FALSE;
			mIsFetching = FALSE;
			mLastPacketTimer.reset();
			mFetchState = 0;
			mFetchPriority = 0;
		}
	}
	else
	{
		LL_INFOS() << mID << ": un-flagging missing asset" << LL_ENDL;
	}
	mIsMissingAsset = is_missing;
}

void LLViewerFetchedTexture::setLoadedCallback( loaded_callback_func loaded_callback,
									   S32 discard_level, BOOL keep_imageraw, BOOL needs_aux, void* userdata, 
									   LLLoadedCallbackEntry::source_callback_list_t* src_callback_list, BOOL pause)
{
	//
	// Don't do ANYTHING here, just add it to the global callback list
	//
	if (mLoadedCallbackList.empty())
	{
		// Put in list to call this->doLoadedCallbacks() periodically
		gTextureList.mCallbackList.insert(this);
		mLoadedCallbackDesiredDiscardLevel = (S8)discard_level;
	}
	else
	{
		mLoadedCallbackDesiredDiscardLevel = llmin(mLoadedCallbackDesiredDiscardLevel, (S8)discard_level);
	}

	if(mPauseLoadedCallBacks)
	{
		if(!pause)
		{
			unpauseLoadedCallbacks(src_callback_list);
		}
	}
	else if(pause)
	{
		pauseLoadedCallbacks(src_callback_list);
	}

	LLLoadedCallbackEntry* entryp = new LLLoadedCallbackEntry(loaded_callback, discard_level, keep_imageraw, userdata, src_callback_list, this, pause);
	mLoadedCallbackList.push_back(entryp);	

	mNeedsAux |= needs_aux;
	if(keep_imageraw)
	{
		mSaveRawImage = TRUE;
	}
	if (mNeedsAux && mAuxRawImage.isNull() && getDiscardLevel() >= 0)
	{
		if(mHasAux)
		{
			//trigger a refetch
			forceToRefetchTexture();
		}
		else
		{
			// We need aux data, but we've already loaded the image, and it didn't have any
			LL_WARNS() << "No aux data available for callback for image:" << getID() << LL_ENDL;
		}
	}
	mLastCallBackActiveTime = sCurrentTime ;
        mLastReferencedSavedRawImageTime = sCurrentTime;
}

void LLViewerFetchedTexture::clearCallbackEntryList()
{
	if(mLoadedCallbackList.empty())
	{
		return;
	}

	for(callback_list_t::iterator iter = mLoadedCallbackList.begin();
			iter != mLoadedCallbackList.end(); )
	{
		LLLoadedCallbackEntry *entryp = *iter;
			
		// We never finished loading the image.  Indicate failure.
		// Note: this allows mLoadedCallbackUserData to be cleaned up.
		entryp->mCallback(FALSE, this, NULL, NULL, 0, TRUE, entryp->mUserData);
		iter = mLoadedCallbackList.erase(iter);
		delete entryp;
	}
	gTextureList.mCallbackList.erase(this);
		
	mLoadedCallbackDesiredDiscardLevel = S8_MAX;
	if(needsToSaveRawImage())
	{
		destroySavedRawImage();
	}

	return;
}

void LLViewerFetchedTexture::deleteCallbackEntry(const LLLoadedCallbackEntry::source_callback_list_t* callback_list)
{
	if(mLoadedCallbackList.empty() || !callback_list)
	{
		return;
	}

	S32 desired_discard = S8_MAX;
	S32 desired_raw_discard = INVALID_DISCARD_LEVEL;
	for(callback_list_t::iterator iter = mLoadedCallbackList.begin();
			iter != mLoadedCallbackList.end(); )
	{
		LLLoadedCallbackEntry *entryp = *iter;
		if(entryp->mSourceCallbackList == callback_list)
		{
			// We never finished loading the image.  Indicate failure.
			// Note: this allows mLoadedCallbackUserData to be cleaned up.
			entryp->mCallback(FALSE, this, NULL, NULL, 0, TRUE, entryp->mUserData);
			iter = mLoadedCallbackList.erase(iter);
			delete entryp;
		}
		else
		{
			++iter;

			desired_discard = llmin(desired_discard, entryp->mDesiredDiscard);
			if(entryp->mNeedsImageRaw)
			{
				desired_raw_discard = llmin(desired_raw_discard, entryp->mDesiredDiscard);
			}
		}
	}

	mLoadedCallbackDesiredDiscardLevel = desired_discard;
	if (mLoadedCallbackList.empty())
	{
		// If we have no callbacks, take us off of the image callback list.
		gTextureList.mCallbackList.erase(this);
		
		if(needsToSaveRawImage())
		{
			destroySavedRawImage();
		}
	}
	else if(needsToSaveRawImage() && mBoostLevel != LLGLTexture::BOOST_PREVIEW)
	{
		if(desired_raw_discard != INVALID_DISCARD_LEVEL)
		{
			mDesiredSavedRawDiscardLevel = desired_raw_discard;
		}
		else
		{
			destroySavedRawImage();
		}
	}
}

void LLViewerFetchedTexture::unpauseLoadedCallbacks(const LLLoadedCallbackEntry::source_callback_list_t* callback_list)
{
	if(!callback_list)
{
		mPauseLoadedCallBacks = FALSE;
		return;
	}

	BOOL need_raw = FALSE;
	for(callback_list_t::iterator iter = mLoadedCallbackList.begin();
			iter != mLoadedCallbackList.end(); )
	{
		LLLoadedCallbackEntry *entryp = *iter++;
		if(entryp->mSourceCallbackList == callback_list)
		{
			entryp->mPaused = FALSE;
			if(entryp->mNeedsImageRaw)
			{
				need_raw = TRUE;
			}
		}
	}
	mPauseLoadedCallBacks = FALSE ;
	mLastCallBackActiveTime = sCurrentTime ;
	mForceCallbackFetch = TRUE;
	if(need_raw)
	{
		mSaveRawImage = TRUE;
	}
}

void LLViewerFetchedTexture::pauseLoadedCallbacks(const LLLoadedCallbackEntry::source_callback_list_t* callback_list)
{
	if(!callback_list)
{
		return;
	}

	bool paused = true;

	for(callback_list_t::iterator iter = mLoadedCallbackList.begin();
			iter != mLoadedCallbackList.end(); )
	{
		LLLoadedCallbackEntry *entryp = *iter++;
		if(entryp->mSourceCallbackList == callback_list)
		{
			entryp->mPaused = TRUE;
		}
		else if(!entryp->mPaused)
		{
			paused = false;
		}
	}

	if(paused)
	{
		mPauseLoadedCallBacks = TRUE;//when set, loaded callback is paused.
		resetTextureStats();
		mSaveRawImage = FALSE;
	}
}

bool LLViewerFetchedTexture::doLoadedCallbacks()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	static const F32 MAX_INACTIVE_TIME = 900.f ; //seconds
	static const F32 MAX_IDLE_WAIT_TIME = 5.f ; //seconds

	if (mNeedsCreateTexture)
	{
		return false;
	}
	if(mPauseLoadedCallBacks)
	{
		destroyRawImage();
		return false; //paused
	}	
	if(sCurrentTime - mLastCallBackActiveTime > MAX_INACTIVE_TIME && !mIsFetching)
	{
		if (mFTType == FTT_SERVER_BAKE)
		{
			//output some debug info
			LL_INFOS() << "baked texture: " << mID << "clears all call backs due to inactivity." << LL_ENDL;
			LL_INFOS() << mUrl << LL_ENDL;
			LL_INFOS() << "current discard: " << getDiscardLevel() << " current discard for fetch: " << getCurrentDiscardLevelForFetching() <<
				" Desired discard: " << getDesiredDiscardLevel() << "decode Pri: " << mMaxVirtualSize << LL_ENDL;
		}

		clearCallbackEntryList() ; //remove all callbacks.
		return false ;
	}

	bool res = false;
	
	if (isMissingAsset())
	{
		if (mFTType == FTT_SERVER_BAKE)
		{
			//output some debug info
			LL_INFOS() << "baked texture: " << mID << "is missing." << LL_ENDL;
			LL_INFOS() << mUrl << LL_ENDL;
		}

		for(callback_list_t::iterator iter = mLoadedCallbackList.begin();
			iter != mLoadedCallbackList.end(); )
		{
			LLLoadedCallbackEntry *entryp = *iter++;
			// We never finished loading the image.  Indicate failure.
			// Note: this allows mLoadedCallbackUserData to be cleaned up.
			entryp->mCallback(FALSE, this, NULL, NULL, 0, TRUE, entryp->mUserData);
			delete entryp;
		}
		mLoadedCallbackList.clear();

		// Remove ourself from the global list of textures with callbacks
		gTextureList.mCallbackList.erase(this);
		return false;
	}	

	S32 gl_discard = getDiscardLevel();

	// If we don't have a legit GL image, set it to be lower than the worst discard level
	if (gl_discard == -1)
	{
		gl_discard = MAX_DISCARD_LEVEL + 1;
	}

	//
	// Determine the quality levels of textures that we can provide to callbacks
	// and whether we need to do decompression/readback to get it
	//
	S32 current_raw_discard = MAX_DISCARD_LEVEL + 1; // We can always do a readback to get a raw discard
	S32 best_raw_discard = gl_discard;	// Current GL quality level
	S32 current_aux_discard = MAX_DISCARD_LEVEL + 1;
	S32 best_aux_discard = MAX_DISCARD_LEVEL + 1;

	if (mIsRawImageValid)
	{
		// If we have an existing raw image, we have a baseline for the raw and auxiliary quality levels.
		best_raw_discard = llmin(best_raw_discard, mRawDiscardLevel);
		best_aux_discard = llmin(best_aux_discard, mRawDiscardLevel); // We always decode the aux when we decode the base raw
		current_aux_discard = llmin(current_aux_discard, best_aux_discard);
	}
	else
	{
		// We have no data at all, we need to get it
		// Do this by forcing the best aux discard to be 0.
		best_aux_discard = 0;
	}


	//
	// See if any of the callbacks would actually run using the data that we can provide,
	// and also determine if we need to perform any readbacks or decodes.
	//
	bool run_gl_callbacks = false;
	bool run_raw_callbacks = false;
	bool need_readback = false;

	for(callback_list_t::iterator iter = mLoadedCallbackList.begin();
		iter != mLoadedCallbackList.end(); )
	{
		LLLoadedCallbackEntry *entryp = *iter++;
	
		if (entryp->mNeedsImageRaw)
		{
			if (mNeedsAux)
			{
				//
				// Need raw and auxiliary channels
				//
				if (entryp->mLastUsedDiscard > current_aux_discard)
				{
					// We have useful data, run the callbacks
					run_raw_callbacks = true;
				}
			}
			else
			{
				if (entryp->mLastUsedDiscard > current_raw_discard)
				{
					// We have useful data, just run the callbacks
					run_raw_callbacks = true;
				}
				else if (entryp->mLastUsedDiscard > best_raw_discard)
				{
					// We can readback data, and then run the callbacks
					need_readback = true;
					run_raw_callbacks = true;
				}
			}
		}
		else
		{
			// Needs just GL
			if (entryp->mLastUsedDiscard > gl_discard)
			{
				// We have enough data, run this callback requiring GL data
				run_gl_callbacks = true;
			}
		}
	}

	//
	// Do a readback if required, OR start off a texture decode
	//
	if (need_readback && (getMaxDiscardLevel() > gl_discard))
	{
		// Do a readback to get the GL data into the raw image
		// We have GL data.

		destroyRawImage();
		reloadRawImage(mLoadedCallbackDesiredDiscardLevel);
		llassert_always(mRawImage.notNull());
		llassert_always(!mNeedsAux || mAuxRawImage.notNull());
	}

	//
	// Run raw/auxiliary data callbacks
	//
	if (run_raw_callbacks && mIsRawImageValid && (mRawDiscardLevel <= getMaxDiscardLevel()))
	{
		// Do callbacks which require raw image data.
		//LL_INFOS() << "doLoadedCallbacks raw for " << getID() << LL_ENDL;

		// Call each party interested in the raw data.
		for(callback_list_t::iterator iter = mLoadedCallbackList.begin();
			iter != mLoadedCallbackList.end(); )
		{
			callback_list_t::iterator curiter = iter++;
			LLLoadedCallbackEntry *entryp = *curiter;
			if (entryp->mNeedsImageRaw && (entryp->mLastUsedDiscard > mRawDiscardLevel))
			{
				// If we've loaded all the data there is to load or we've loaded enough
				// to satisfy the interested party, then this is the last time that
				// we're going to call them.

				mLastCallBackActiveTime = sCurrentTime;
				//llassert_always(mRawImage.notNull());
				if(mNeedsAux && mAuxRawImage.isNull())
				{
					LL_WARNS() << "Raw Image with no Aux Data for callback" << LL_ENDL;
				}
				BOOL final = mRawDiscardLevel <= entryp->mDesiredDiscard ? TRUE : FALSE;
				//LL_INFOS() << "Running callback for " << getID() << LL_ENDL;
				//LL_INFOS() << mRawImage->getWidth() << "x" << mRawImage->getHeight() << LL_ENDL;
				entryp->mLastUsedDiscard = mRawDiscardLevel;
				entryp->mCallback(TRUE, this, mRawImage, mAuxRawImage, mRawDiscardLevel, final, entryp->mUserData);
				if (final)
				{
					iter = mLoadedCallbackList.erase(curiter);
					delete entryp;
				}
				res = true;
			}
		}
	}

	//
	// Run GL callbacks
	//
	if (run_gl_callbacks && (gl_discard <= getMaxDiscardLevel()))
	{
		//LL_INFOS() << "doLoadedCallbacks GL for " << getID() << LL_ENDL;

		// Call the callbacks interested in GL data.
		for(callback_list_t::iterator iter = mLoadedCallbackList.begin();
			iter != mLoadedCallbackList.end(); )
		{
			callback_list_t::iterator curiter = iter++;
			LLLoadedCallbackEntry *entryp = *curiter;
			if (!entryp->mNeedsImageRaw && (entryp->mLastUsedDiscard > gl_discard))
			{
				mLastCallBackActiveTime = sCurrentTime;
				BOOL final = gl_discard <= entryp->mDesiredDiscard ? TRUE : FALSE;
				entryp->mLastUsedDiscard = gl_discard;
				entryp->mCallback(TRUE, this, NULL, NULL, gl_discard, final, entryp->mUserData);
				if (final)
				{
					iter = mLoadedCallbackList.erase(curiter);
					delete entryp;
				}
				res = true;
			}
		}
	}

	// Done with any raw image data at this point (will be re-created if we still have callbacks)
	destroyRawImage();

	//
	// If we have no callbacks, take us off of the image callback list.
	//
	if (mLoadedCallbackList.empty())
	{
		gTextureList.mCallbackList.erase(this);
	}
	else if(!res && mForceCallbackFetch && sCurrentTime - mLastCallBackActiveTime > MAX_IDLE_WAIT_TIME && !mIsFetching)
	{
		//wait for long enough but no fetching request issued, force one.
		forceToRefetchTexture(mLoadedCallbackDesiredDiscardLevel, 5.f);
		mForceCallbackFetch = FALSE; //fire once.
	}

	return res;
}

//virtual
void LLViewerFetchedTexture::forceImmediateUpdate()
{
	//only immediately update a deleted texture which is now being re-used.
	if(!isDeleted())
	{
		return;
	}
	//if already called forceImmediateUpdate()
	if(mInImageList && mMaxVirtualSize == LLViewerFetchedTexture::sMaxVirtualSize)
	{
		return;
	}

	gTextureList.forceImmediateUpdate(this);
	return;
}

LLImageRaw* LLViewerFetchedTexture::reloadRawImage(S8 discard_level)
{
	llassert_always(mGLTexturep.notNull());
	llassert_always(discard_level >= 0);
	llassert_always(mComponents > 0);

	if (mRawImage.notNull())
	{
		//mRawImage is in use by somebody else, do not delete it.
		return NULL;
	}

	if(mSavedRawDiscardLevel >= 0 && mSavedRawDiscardLevel <= discard_level)
	{
		if (mSavedRawDiscardLevel != discard_level && mBoostLevel != BOOST_ICON)
		{
			mRawImage = new LLImageRaw(getWidth(discard_level), getHeight(discard_level), getComponents());
			mRawImage->copy(getSavedRawImage());
		}
		else
		{
			mRawImage = getSavedRawImage();
		}
		mRawDiscardLevel = discard_level;
	}
	else
	{		
		//force to fetch raw image again if cached raw image is not good enough.
		if(mCachedRawDiscardLevel > discard_level)
		{
			mRawImage = mCachedRawImage;
			mRawDiscardLevel = mCachedRawDiscardLevel;
		}
		else //cached raw image is good enough, copy it.
		{
			if(mCachedRawDiscardLevel != discard_level)
			{
				mRawImage = new LLImageRaw(getWidth(discard_level), getHeight(discard_level), getComponents());
				mRawImage->copy(mCachedRawImage);
			}
			else
			{
				mRawImage = mCachedRawImage;
			}
			mRawDiscardLevel = discard_level;
		}
	}
	mIsRawImageValid = TRUE;
	sRawCount++;	
	
	return mRawImage;
}

bool LLViewerFetchedTexture::needsToSaveRawImage()
{
	return mForceToSaveRawImage || mSaveRawImage;
}

void LLViewerFetchedTexture::destroyRawImage()
{	
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if (mAuxRawImage.notNull() && !needsToSaveRawImage())
	{
		sAuxCount--;
		mAuxRawImage = NULL;
	}

	if (mRawImage.notNull()) 
	{
		sRawCount--;		

		if(mIsRawImageValid)
		{
			if(needsToSaveRawImage())
			{
				saveRawImage();
			}		
			setCachedRawImage();
		}
		
		mRawImage = NULL;
	
		mIsRawImageValid = FALSE;
		mRawDiscardLevel = INVALID_DISCARD_LEVEL;
	}
}

//use the mCachedRawImage to (re)generate the gl texture.
//virtual
void LLViewerFetchedTexture::switchToCachedImage()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if(mCachedRawImage.notNull() && 
        !mNeedsCreateTexture) // <--- texture creation is pending, don't step on it
	{
		mRawImage = mCachedRawImage;
						
		if (getComponents() != mRawImage->getComponents())
		{
			// We've changed the number of components, so we need to move any
			// objects using this pool to a different pool.
			mComponents = mRawImage->getComponents();
			mGLTexturep->setComponents(mComponents);
			gTextureList.dirtyImage(this);
		}

		mIsRawImageValid = TRUE;
		mRawDiscardLevel = mCachedRawDiscardLevel;

        scheduleCreateTexture();
	}
}

//cache the imageraw forcefully.
//virtual 
void LLViewerFetchedTexture::setCachedRawImage(S32 discard_level, LLImageRaw* imageraw) 
{
	if(imageraw != mRawImage.get())
    {
        if (mBoostLevel == LLGLTexture::BOOST_ICON)
        {
            S32 expected_width = mKnownDrawWidth > 0 ? mKnownDrawWidth : DEFAULT_ICON_DIMENTIONS;
            S32 expected_height = mKnownDrawHeight > 0 ? mKnownDrawHeight : DEFAULT_ICON_DIMENTIONS;
            if (mRawImage->getWidth() > expected_width || mRawImage->getHeight() > expected_height)
            {
                mCachedRawImage = new LLImageRaw(expected_width, expected_height, imageraw->getComponents());
                mCachedRawImage->copyScaled(imageraw);
            }
            else
            {
                mCachedRawImage = imageraw;
            }
        }
        else
        {
            mCachedRawImage = imageraw;
        }
		mCachedRawDiscardLevel = discard_level;
		mCachedRawImageReady = TRUE;
	}
}

void LLViewerFetchedTexture::setCachedRawImage()
{	
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if(mRawImage == mCachedRawImage)
	{
		return;
	}
	if(!mIsRawImageValid)
	{
		return;
	}

	if(mCachedRawImageReady)
	{
		return;
	}

	if(mCachedRawDiscardLevel < 0 || mCachedRawDiscardLevel > mRawDiscardLevel)
	{
		S32 i = 0;
		S32 w = mRawImage->getWidth();
		S32 h = mRawImage->getHeight();

		S32 max_size = MAX_CACHED_RAW_IMAGE_AREA;
		if(LLGLTexture::BOOST_TERRAIN == mBoostLevel)
		{
			max_size = MAX_CACHED_RAW_TERRAIN_IMAGE_AREA;
		}		
		if(mForSculpt)
		{
			max_size = MAX_CACHED_RAW_SCULPT_IMAGE_AREA;
			mCachedRawImageReady = !mRawDiscardLevel;
		}
		else
		{
			mCachedRawImageReady = (!mRawDiscardLevel || ((w * h) >= max_size));
		}

		while(((w >> i) * (h >> i)) > max_size)
		{
			++i;
		}
		
		if(i)
		{
			if(!(w >> i) || !(h >> i))
			{
				--i;
			}
			
			{
				//make a duplicate in case somebody else is using this raw image
				mRawImage = mRawImage->scaled(w >> i, h >> i);
			}
		}
		mCachedRawImage = mRawImage;
		mRawDiscardLevel += i;
		mCachedRawDiscardLevel = mRawDiscardLevel;			
	}
}

void LLViewerFetchedTexture::checkCachedRawSculptImage()
{
	if(mCachedRawImageReady && mCachedRawDiscardLevel > 0)
	{
		if(getDiscardLevel() != 0)
		{
			mCachedRawImageReady = FALSE;
		}
		else if(isForSculptOnly())
		{
			resetTextureStats(); //do not update this image any more.
		}
	}
}

void LLViewerFetchedTexture::saveRawImage() 
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	if(mRawImage.isNull() || mRawImage == mSavedRawImage || (mSavedRawDiscardLevel >= 0 && mSavedRawDiscardLevel <= mRawDiscardLevel))
	{
		return;
	}

	mSavedRawDiscardLevel = mRawDiscardLevel;
    if (mBoostLevel == LLGLTexture::BOOST_ICON)
    {
        S32 expected_width = mKnownDrawWidth > 0 ? mKnownDrawWidth : DEFAULT_ICON_DIMENTIONS;
        S32 expected_height = mKnownDrawHeight > 0 ? mKnownDrawHeight : DEFAULT_ICON_DIMENTIONS;
        if (mRawImage->getWidth() > expected_width || mRawImage->getHeight() > expected_height)
        {
            mSavedRawImage = new LLImageRaw(expected_width, expected_height, mRawImage->getComponents());
            mSavedRawImage->copyScaled(mRawImage);
        }
        else
        {
            mSavedRawImage = new LLImageRaw(mRawImage->getData(), mRawImage->getWidth(), mRawImage->getHeight(), mRawImage->getComponents());
        }
    }
    else
    {
        mSavedRawImage = new LLImageRaw(mRawImage->getData(), mRawImage->getWidth(), mRawImage->getHeight(), mRawImage->getComponents());
    }

	if(mForceToSaveRawImage && mSavedRawDiscardLevel <= mDesiredSavedRawDiscardLevel)
	{
		mForceToSaveRawImage = FALSE;
	}

	mLastReferencedSavedRawImageTime = sCurrentTime;
}

//force to refetch the texture to the discard level 
void LLViewerFetchedTexture::forceToRefetchTexture(S32 desired_discard, F32 kept_time)
{
	if(mForceToSaveRawImage)
	{
		desired_discard = llmin(desired_discard, mDesiredSavedRawDiscardLevel);
		kept_time = llmax(kept_time, mKeptSavedRawImageTime);
	}

	//trigger a new fetch.
	mForceToSaveRawImage = TRUE ;
	mDesiredSavedRawDiscardLevel = desired_discard ;
	mKeptSavedRawImageTime = kept_time ;
	mLastReferencedSavedRawImageTime = sCurrentTime ;
	mSavedRawImage = NULL ;
	mSavedRawDiscardLevel = -1 ;
}

void LLViewerFetchedTexture::forceToSaveRawImage(S32 desired_discard, F32 kept_time) 
{ 
	mKeptSavedRawImageTime = kept_time;
	mLastReferencedSavedRawImageTime = sCurrentTime;

	if(mSavedRawDiscardLevel > -1 && mSavedRawDiscardLevel <= desired_discard)
	{
		return; //raw imge is ready.
	}

	if(!mForceToSaveRawImage || mDesiredSavedRawDiscardLevel < 0 || mDesiredSavedRawDiscardLevel > desired_discard)
	{
		mForceToSaveRawImage = TRUE;
		mDesiredSavedRawDiscardLevel = desired_discard;
	
		//copy from the cached raw image if exists.
		if(mCachedRawImage.notNull() && mRawImage.isNull() )
		{
			mRawImage = mCachedRawImage;
			mRawDiscardLevel = mCachedRawDiscardLevel;

			saveRawImage();

			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 ;
	mForceToSaveRawImage  = FALSE ;
	mSaveRawImage = FALSE ;
	mSavedRawDiscardLevel = -1 ;
	mDesiredSavedRawDiscardLevel = -1 ;
	mLastReferencedSavedRawImageTime = 0.0f ;
	mKeptSavedRawImageTime = 0.f ;
	
	if(mAuxRawImage.notNull())
	{
		sAuxCount--;
		mAuxRawImage = NULL;
	}
}

LLImageRaw* LLViewerFetchedTexture::getSavedRawImage() 
{
	mLastReferencedSavedRawImageTime = sCurrentTime;

	return mSavedRawImage;
}
	
BOOL LLViewerFetchedTexture::hasSavedRawImage() const
{
	return mSavedRawImage.notNull();
}
	
F32 LLViewerFetchedTexture::getElapsedLastReferencedSavedRawImageTime() const
{ 
	return sCurrentTime - mLastReferencedSavedRawImageTime;
}

//----------------------------------------------------------------------------------------------
//end of LLViewerFetchedTexture
//----------------------------------------------------------------------------------------------

//----------------------------------------------------------------------------------------------
//start of LLViewerLODTexture
//----------------------------------------------------------------------------------------------
LLViewerLODTexture::LLViewerLODTexture(const LLUUID& id, FTType f_type, const LLHost& host, BOOL usemipmaps)
	: LLViewerFetchedTexture(id, f_type, host, usemipmaps)
{
	init(TRUE);
}

LLViewerLODTexture::LLViewerLODTexture(const std::string& url, FTType f_type, const LLUUID& id, BOOL usemipmaps)
	: LLViewerFetchedTexture(url, f_type, id, usemipmaps)
{
	init(TRUE);
}

void LLViewerLODTexture::init(bool firstinit)
{
	mTexelsPerImage = 64.f*64.f;
	mDiscardVirtualSize = 0.f;
	mCalculatedDiscardLevel = -1.f;
}

//virtual 
S8 LLViewerLODTexture::getType() const
{
	return LLViewerTexture::LOD_TEXTURE;
}

bool LLViewerLODTexture::isUpdateFrozen()
{
	return LLViewerTexture::sFreezeImageUpdates;
}

// This is gauranteed to get called periodically for every texture
//virtual
void LLViewerLODTexture::processTextureStats()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	updateVirtualSize();
	
	static LLCachedControl<bool> textures_fullres(gSavedSettings,"TextureLoadFullRes", false);
	
	if (textures_fullres)
	{
		mDesiredDiscardLevel = 0;
	}
	// Generate the request priority and render priority
	else if (mDontDiscard || !mUseMipMaps)
	{
		mDesiredDiscardLevel = 0;
		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 if (!LLPipeline::sRenderDeferred && mBoostLevel == LLGLTexture::BOOST_ALM)
	{
		mDesiredDiscardLevel = MAX_DISCARD_LEVEL + 1;
	}
	else if (mBoostLevel < LLGLTexture::BOOST_HIGH && mMaxVirtualSize <= 10.f)
	{
		// If the image has not been significantly visible in a while, we don't want it
		mDesiredDiscardLevel = llmin(mMinDesiredDiscardLevel, (S8)(MAX_DISCARD_LEVEL + 1));
	}
	else if (!mFullWidth  || !mFullHeight)
	{
		mDesiredDiscardLevel = 	getMaxDiscardLevel();
	}
	else
	{
		//static const F64 log_2 = log(2.0);
		static const F64 log_4 = log(4.0);

		F32 discard_level = 0.f;

		// If we know the output width and height, we can force the discard
		// level to the correct value, and thus not decode more texture
		// data than we need to.
		if (mKnownDrawWidth && mKnownDrawHeight)
		{
			S32 draw_texels = mKnownDrawWidth * mKnownDrawHeight;
			draw_texels = llclamp(draw_texels, MIN_IMAGE_AREA, MAX_IMAGE_AREA);

			// Use log_4 because we're in square-pixel space, so an image
			// with twice the width and twice the height will have mTexelsPerImage
			// 4 * draw_size
			discard_level = (F32)(log(mTexelsPerImage/draw_texels) / log_4);
		}
		else
		{
			// Calculate the required scale factor of the image using pixels per texel
			discard_level = (F32)(log(mTexelsPerImage/mMaxVirtualSize) / log_4);
			mDiscardVirtualSize = mMaxVirtualSize;
			mCalculatedDiscardLevel = discard_level;
		}
		if (mBoostLevel < LLGLTexture::BOOST_SCULPTED)
		{
			discard_level += sDesiredDiscardBias;
			discard_level *= sDesiredDiscardScale; // scale
			discard_level += sCameraMovingDiscardBias;
		}
		discard_level = floorf(discard_level);

		F32 min_discard = 0.f;
		U32 desired_size = MAX_IMAGE_SIZE_DEFAULT; // MAX_IMAGE_SIZE_DEFAULT = 1024 and max size ever is 2048
		if (mBoostLevel <= LLGLTexture::BOOST_SCULPTED)
		{
			desired_size = DESIRED_NORMAL_TEXTURE_SIZE;
		}
		if (mFullWidth > desired_size || mFullHeight > desired_size)
			min_discard = 1.f;

		discard_level = llclamp(discard_level, min_discard, (F32)MAX_DISCARD_LEVEL);
		
		// Can't go higher than the max discard level
		mDesiredDiscardLevel = llmin(getMaxDiscardLevel() + 1, (S32)discard_level);
		// Clamp to min desired discard
		mDesiredDiscardLevel = llmin(mMinDesiredDiscardLevel, mDesiredDiscardLevel);

		//
		// At this point we've calculated the quality level that we want,
		// if possible.  Now we check to see if we have it, and take the
		// proper action if we don't.
		//

		S32 current_discard = getDiscardLevel();
		if (sDesiredDiscardBias > 0.0f && mBoostLevel < LLGLTexture::BOOST_SCULPTED && current_discard >= 0)
		{
			if(desired_discard_bias_max <= sDesiredDiscardBias && !mForceToSaveRawImage)
			{
				//needs to release texture memory urgently
				scaleDown();
			}
		}

		if (isUpdateFrozen() // we are out of memory and nearing max allowed bias
			&& mBoostLevel < LLGLTexture::BOOST_SCULPTED
			&& mDesiredDiscardLevel < current_discard)
		{
			// stop requesting more
			mDesiredDiscardLevel = current_discard;
		}
	}

	if(mForceToSaveRawImage && mDesiredSavedRawDiscardLevel >= 0)
	{
		mDesiredDiscardLevel = llmin(mDesiredDiscardLevel, (S8)mDesiredSavedRawDiscardLevel);
	}
}

bool LLViewerLODTexture::scaleDown()
{
	if(hasGLTexture() && mCachedRawDiscardLevel > getDiscardLevel())
	{		
		switchToCachedImage();	

		LLTexturePipelineTester* tester = (LLTexturePipelineTester*)LLMetricPerformanceTesterBasic::getTester(sTesterName);
		if (tester)
		{
			tester->setStablizingTime();
		}

		return true;
	}
	return false;
}
//----------------------------------------------------------------------------------------------
//end of LLViewerLODTexture
//----------------------------------------------------------------------------------------------

//----------------------------------------------------------------------------------------------
//start of LLViewerMediaTexture
//----------------------------------------------------------------------------------------------
//static
void LLViewerMediaTexture::updateClass()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
	static const F32 MAX_INACTIVE_TIME = 30.f;

#if 0
	//force to play media.
	gSavedSettings.setBOOL("AudioStreamingMedia", true);
#endif

	for(media_map_t::iterator iter = sMediaMap.begin(); iter != sMediaMap.end(); )
	{
		LLViewerMediaTexture* mediap = iter->second;	
		
		if(mediap->getNumRefs() == 1) //one reference by sMediaMap
		{
			//
			//Note: delay some time to delete the media textures to stop endlessly creating and immediately removing media texture.
			//
			if(mediap->getLastReferencedTimer()->getElapsedTimeF32() > MAX_INACTIVE_TIME)
			{
				media_map_t::iterator cur = iter++;
				sMediaMap.erase(cur);
				continue;
			}
		}
		++iter;
	}
}

//static 
void LLViewerMediaTexture::removeMediaImplFromTexture(const LLUUID& media_id) 
{
	LLViewerMediaTexture* media_tex = findMediaTexture(media_id);
	if(media_tex)
	{
		media_tex->invalidateMediaImpl();
	}
}

//static
void LLViewerMediaTexture::cleanUpClass()
{
	sMediaMap.clear();
}

//static
LLViewerMediaTexture* LLViewerMediaTexture::findMediaTexture(const LLUUID& media_id)
{
	media_map_t::iterator iter = sMediaMap.find(media_id);
	if(iter == sMediaMap.end())
	{
		return NULL;
	}

	LLViewerMediaTexture* media_tex = iter->second;
	media_tex->setMediaImpl();
	media_tex->getLastReferencedTimer()->reset();

	return media_tex;
}

LLViewerMediaTexture::LLViewerMediaTexture(const LLUUID& id, BOOL usemipmaps, LLImageGL* gl_image) 
	: LLViewerTexture(id, usemipmaps),
	mMediaImplp(NULL),
	mUpdateVirtualSizeTime(0)
{
	sMediaMap.insert(std::make_pair(id, this));

	mGLTexturep = gl_image;

	if(mGLTexturep.isNull())
	{
		generateGLTexture();
	}

	mGLTexturep->setAllowCompression(false);

	mGLTexturep->setNeedsAlphaAndPickMask(FALSE);

	mIsPlaying = FALSE;

	setMediaImpl();

	setCategory(LLGLTexture::MEDIA);
	
	LLViewerTexture* tex = gTextureList.findImage(mID, TEX_LIST_STANDARD);
	if(tex) //this media is a parcel media for tex.
	{
		tex->setParcelMedia(this);
	}
}

//virtual 
LLViewerMediaTexture::~LLViewerMediaTexture() 
{	
	LLViewerTexture* tex = gTextureList.findImage(mID, TEX_LIST_STANDARD);
	if(tex) //this media is a parcel media for tex.
	{
		tex->setParcelMedia(NULL);
	}
}

void LLViewerMediaTexture::reinit(BOOL usemipmaps /* = TRUE */)
{
	llassert(mGLTexturep.notNull());

	mUseMipMaps = usemipmaps;
	getLastReferencedTimer()->reset();
	mGLTexturep->setUseMipMaps(mUseMipMaps);
	mGLTexturep->setNeedsAlphaAndPickMask(FALSE);
}

void LLViewerMediaTexture::setUseMipMaps(BOOL mipmap) 
{
	mUseMipMaps = mipmap;

	if(mGLTexturep.notNull())
	{
		mGLTexturep->setUseMipMaps(mipmap);
	}
}

//virtual 
S8 LLViewerMediaTexture::getType() const
{
	return LLViewerTexture::MEDIA_TEXTURE;
}

void LLViewerMediaTexture::invalidateMediaImpl() 
{
	mMediaImplp = NULL;
}

void LLViewerMediaTexture::setMediaImpl()
{
	if(!mMediaImplp)
	{
		mMediaImplp = LLViewerMedia::getInstance()->getMediaImplFromTextureID(mID);
	}
}

//return true if all faces to reference to this media texture are found
//Note: mMediaFaceList is valid only for the current instant 
//      because it does not check the face validity after the current frame.
BOOL LLViewerMediaTexture::findFaces()
{	
	mMediaFaceList.clear();

	BOOL ret = TRUE;
	
	LLViewerTexture* tex = gTextureList.findImage(mID, TEX_LIST_STANDARD);
	if(tex) //this media is a parcel media for tex.
	{
		for (U32 ch = 0; ch < LLRender::NUM_TEXTURE_CHANNELS; ++ch)
		{
			const ll_face_list_t* face_list = tex->getFaceList(ch);
			U32 end = tex->getNumFaces(ch);
		for(U32 i = 0; i < end; i++)
		{
			if ((*face_list)[i]->isMediaAllowed())
			{
				mMediaFaceList.push_back((*face_list)[i]);
			}
		}
	}
	}
	
	if(!mMediaImplp)
	{
		return TRUE; 
	}

	//for media on a face.
	const std::list< LLVOVolume* >* obj_list = mMediaImplp->getObjectList();
	std::list< LLVOVolume* >::const_iterator iter = obj_list->begin();
	for(; iter != obj_list->end(); ++iter)
	{
		LLVOVolume* obj = *iter;
        if (obj->isDead())
        {
            // Isn't supposed to happen, objects are supposed to detach
            // themselves on markDead()
            // If this happens, viewer is likely to crash
            llassert(0);
            LL_WARNS() << "Dead object in mMediaImplp's object list" << LL_ENDL;
            ret = FALSE;
            continue;
        }

        if (obj->mDrawable.isNull() || obj->mDrawable->isDead())
        {
            ret = FALSE;
            continue;
        }

		S32 face_id = -1;
		S32 num_faces = obj->mDrawable->getNumFaces();
		while((face_id = obj->getFaceIndexWithMediaImpl(mMediaImplp, face_id)) > -1 && face_id < num_faces)
		{
			LLFace* facep = obj->mDrawable->getFace(face_id);
			if(facep)
			{
				mMediaFaceList.push_back(facep);
			}
			else
			{
				ret = FALSE;
			}
		}
	}

	return ret;
}

void LLViewerMediaTexture::initVirtualSize()
{
	if(mIsPlaying)
	{
		return;
	}

	findFaces();
	for(std::list< LLFace* >::iterator iter = mMediaFaceList.begin(); iter!= mMediaFaceList.end(); ++iter)
	{
		addTextureStats((*iter)->getVirtualSize());
	}
}

void LLViewerMediaTexture::addMediaToFace(LLFace* facep) 
{
	if(facep)
	{
		facep->setHasMedia(true);
	}
	if(!mIsPlaying)
	{
		return; //no need to add the face because the media is not in playing.
	}

	switchTexture(LLRender::DIFFUSE_MAP, facep);
}
	
void LLViewerMediaTexture::removeMediaFromFace(LLFace* facep) 
{
	if(!facep)
	{
		return;
	}
	facep->setHasMedia(false);

	if(!mIsPlaying)
	{
		return; //no need to remove the face because the media is not in playing.
	}	

	mIsPlaying = FALSE; //set to remove the media from the face.
	switchTexture(LLRender::DIFFUSE_MAP, facep);
	mIsPlaying = TRUE; //set the flag back.

	if(getTotalNumFaces() < 1) //no face referencing to this media
	{
		stopPlaying();
	}
}

//virtual 
void LLViewerMediaTexture::addFace(U32 ch, LLFace* facep) 
{
	LLViewerTexture::addFace(ch, facep);

	const LLTextureEntry* te = facep->getTextureEntry();
	if(te && te->getID().notNull())
	{
		LLViewerTexture* tex = gTextureList.findImage(te->getID(), TEX_LIST_STANDARD);
		if(tex)
		{
			mTextureList.push_back(tex);//increase the reference number by one for tex to avoid deleting it.
			return;
		}
	}

	//check if it is a parcel media
	if(facep->getTexture() && facep->getTexture() != this && facep->getTexture()->getID() == mID)
	{
		mTextureList.push_back(facep->getTexture()); //a parcel media.
		return;
	}
	
	if(te && te->getID().notNull()) //should have a texture
	{
		LL_ERRS() << "The face does not have a valid texture before media texture." << LL_ENDL;
	}
}

//virtual 
void LLViewerMediaTexture::removeFace(U32 ch, LLFace* facep) 
{
	LLViewerTexture::removeFace(ch, facep);

	const LLTextureEntry* te = facep->getTextureEntry();
	if(te && te->getID().notNull())
	{
		LLViewerTexture* tex = gTextureList.findImage(te->getID(), TEX_LIST_STANDARD);
		if(tex)
		{
			for(std::list< LLPointer<LLViewerTexture> >::iterator iter = mTextureList.begin();
				iter != mTextureList.end(); ++iter)
			{
				if(*iter == tex)
				{
					mTextureList.erase(iter); //decrease the reference number for tex by one.
					return;
				}
			}

			std::vector<const LLTextureEntry*> te_list;
			
			for (U32 ch = 0; ch < 3; ++ch)
			{
			//
			//we have some trouble here: the texture of the face is changed.
			//we need to find the former texture, and remove it from the list to avoid memory leaking.
				
				llassert(mNumFaces[ch] <= mFaceList[ch].size());

				for(U32 j = 0; j < mNumFaces[ch]; j++)
				{
					te_list.push_back(mFaceList[ch][j]->getTextureEntry());//all textures are in use.
				}
			}

			if (te_list.empty())
			{
				mTextureList.clear();
				return;
			}

			S32 end = te_list.size();

			for(std::list< LLPointer<LLViewerTexture> >::iterator iter = mTextureList.begin();
				iter != mTextureList.end(); ++iter)
			{
				S32 i = 0;

				for(i = 0; i < end; i++)
				{
					if(te_list[i] && te_list[i]->getID() == (*iter)->getID())//the texture is in use.
					{
						te_list[i] = NULL;
						break;
					}
				}
				if(i == end) //no hit for this texture, remove it.
				{
					mTextureList.erase(iter); //decrease the reference number for tex by one.
					return;
				}
			}
		}
	}

	//check if it is a parcel media
	for(std::list< LLPointer<LLViewerTexture> >::iterator iter = mTextureList.begin();
				iter != mTextureList.end(); ++iter)
	{
		if((*iter)->getID() == mID)
		{
			mTextureList.erase(iter); //decrease the reference number for tex by one.
			return;
		}
	}

	if(te && te->getID().notNull()) //should have a texture but none found
	{
		LL_ERRS() << "mTextureList texture reference number is corrupted. Texture id: " << te->getID() << " List size: " << (U32)mTextureList.size() << LL_ENDL;
	}
}

void LLViewerMediaTexture::stopPlaying()
{
	// Don't stop the media impl playing here -- this breaks non-inworld media (login screen, search, and media browser).
//	if(mMediaImplp)
//	{
//		mMediaImplp->stop();
//	}
	mIsPlaying = FALSE;			
}

void LLViewerMediaTexture::switchTexture(U32 ch, LLFace* facep)
{
	if(facep)
	{
		//check if another media is playing on this face.
		if(facep->getTexture() && facep->getTexture() != this 
			&& facep->getTexture()->getType() == LLViewerTexture::MEDIA_TEXTURE)
		{
			if(mID == facep->getTexture()->getID()) //this is a parcel media
			{
				return; //let the prim media win.
			}
		}

		if(mIsPlaying) //old textures switch to the media texture
		{
			facep->switchTexture(ch, this);
		}
		else //switch to old textures.
		{
			const LLTextureEntry* te = facep->getTextureEntry();
			if(te)
			{
				LLViewerTexture* tex = te->getID().notNull() ? gTextureList.findImage(te->getID(), TEX_LIST_STANDARD) : NULL;
				if(!tex && te->getID() != mID)//try parcel media.
				{
					tex = gTextureList.findImage(mID, TEX_LIST_STANDARD);
				}
				if(!tex)
				{
					tex = LLViewerFetchedTexture::sDefaultImagep;
				}
				facep->switchTexture(ch, tex);
			}
		}
	}
}

void LLViewerMediaTexture::setPlaying(BOOL playing) 
{
	if(!mMediaImplp)
	{
		return; 
	}
	if(!playing && !mIsPlaying)
	{
		return; //media is already off
	}

	if(playing == mIsPlaying && !mMediaImplp->isUpdated())
	{
		return; //nothing has changed since last time.
	}	

	mIsPlaying = playing;
	if(mIsPlaying) //is about to play this media
	{
		if(findFaces())
		{
			//about to update all faces.
			mMediaImplp->setUpdated(FALSE);
		}

		if(mMediaFaceList.empty())//no face pointing to this media
		{
			stopPlaying();
			return;
		}

		for(std::list< LLFace* >::iterator iter = mMediaFaceList.begin(); iter!= mMediaFaceList.end(); ++iter)
		{
			switchTexture(LLRender::DIFFUSE_MAP, *iter);
		}
	}
	else //stop playing this media
	{
		U32 ch = LLRender::DIFFUSE_MAP;
		
		llassert(mNumFaces[ch] <= mFaceList[ch].size());
		for(U32 i = mNumFaces[ch]; i; i--)
		{
			switchTexture(ch, mFaceList[ch][i - 1]); //current face could be removed in this function.
		}
	}
	return;
}

//virtual 
F32 LLViewerMediaTexture::getMaxVirtualSize() 
{	
	if(LLFrameTimer::getFrameCount() == mUpdateVirtualSizeTime)
	{
		return mMaxVirtualSize;
	}
	mUpdateVirtualSizeTime = LLFrameTimer::getFrameCount();

	if(!mMaxVirtualSizeResetCounter)
	{
		addTextureStats(0.f, FALSE);//reset
	}

	if(mIsPlaying) //media is playing
	{
		for (U32 ch = 0; ch < LLRender::NUM_TEXTURE_CHANNELS; ++ch)
		{
			llassert(mNumFaces[ch] <= mFaceList[ch].size());
			for(U32 i = 0; i < mNumFaces[ch]; i++)
			{
				LLFace* facep = mFaceList[ch][i];
			if(facep->getDrawable()->isRecentlyVisible())
			{
				addTextureStats(facep->getVirtualSize());
			}
		}		
	}
	}
	else //media is not in playing
	{
		findFaces();
	
		if(!mMediaFaceList.empty())
		{
			for(std::list< LLFace* >::iterator iter = mMediaFaceList.begin(); iter!= mMediaFaceList.end(); ++iter)
			{
				LLFace* facep = *iter;
				if(facep->getDrawable()->isRecentlyVisible())
				{
					addTextureStats(facep->getVirtualSize());
				}
			}
		}
	}

	if(mMaxVirtualSizeResetCounter > 0)
	{
		mMaxVirtualSizeResetCounter--;
	}
	reorganizeFaceList();
	reorganizeVolumeList();

	return mMaxVirtualSize;
}
//----------------------------------------------------------------------------------------------
//end of LLViewerMediaTexture
//----------------------------------------------------------------------------------------------

//----------------------------------------------------------------------------------------------
//start of LLTexturePipelineTester
//----------------------------------------------------------------------------------------------
LLTexturePipelineTester::LLTexturePipelineTester() : LLMetricPerformanceTesterWithSession(sTesterName) 
{
	addMetric("TotalBytesLoaded");
	addMetric("TotalBytesLoadedFromCache");
	addMetric("TotalBytesLoadedForLargeImage");
	addMetric("TotalBytesLoadedForSculpties");
	addMetric("StartFetchingTime");
	addMetric("TotalGrayTime");
	addMetric("TotalStablizingTime");
	addMetric("StartTimeLoadingSculpties");
	addMetric("EndTimeLoadingSculpties");

	addMetric("Time");
	addMetric("TotalBytesBound");
	addMetric("TotalBytesBoundForLargeImage");
	addMetric("PercentageBytesBound");
	
	mTotalBytesLoaded = (S32Bytes)0;
	mTotalBytesLoadedFromCache = (S32Bytes)0;	
	mTotalBytesLoadedForLargeImage = (S32Bytes)0;
	mTotalBytesLoadedForSculpties = (S32Bytes)0;

	reset();
}

LLTexturePipelineTester::~LLTexturePipelineTester()
{
	LLViewerTextureManager::sTesterp = NULL;
}

void LLTexturePipelineTester::update()
{
	mLastTotalBytesUsed = mTotalBytesUsed;
	mLastTotalBytesUsedForLargeImage = mTotalBytesUsedForLargeImage;
	mTotalBytesUsed = (S32Bytes)0;
	mTotalBytesUsedForLargeImage = (S32Bytes)0;
	
	if(LLAppViewer::getTextureFetch()->getNumRequests() > 0) //fetching list is not empty
	{
		if(mPause)
		{
			//start a new fetching session
			reset();
			mStartFetchingTime = LLImageGL::sLastFrameTime;
			mPause = FALSE;
		}

		//update total gray time		
		if(mUsingDefaultTexture)
		{
			mUsingDefaultTexture = FALSE;
			mTotalGrayTime = LLImageGL::sLastFrameTime - mStartFetchingTime;		
		}

		//update the stablizing timer.
		updateStablizingTime();

		outputTestResults();
	}
	else if(!mPause)
	{
		//stop the current fetching session
		mPause = TRUE;
		outputTestResults();
		reset();
	}		
}
	
void LLTexturePipelineTester::reset() 
{
	mPause = TRUE;

	mUsingDefaultTexture = FALSE;
	mStartStablizingTime = 0.0f;
	mEndStablizingTime = 0.0f;

	mTotalBytesUsed = (S32Bytes)0;
	mTotalBytesUsedForLargeImage = (S32Bytes)0;
	mLastTotalBytesUsed = (S32Bytes)0;
	mLastTotalBytesUsedForLargeImage = (S32Bytes)0;
	
	mStartFetchingTime = 0.0f;
	
	mTotalGrayTime = 0.0f;
	mTotalStablizingTime = 0.0f;

	mStartTimeLoadingSculpties = 1.0f;
	mEndTimeLoadingSculpties = 0.0f;
}

//virtual 
void LLTexturePipelineTester::outputTestRecord(LLSD *sd) 
{	
	std::string currentLabel = getCurrentLabelName();
	(*sd)[currentLabel]["TotalBytesLoaded"]              = (LLSD::Integer)mTotalBytesLoaded.value();
	(*sd)[currentLabel]["TotalBytesLoadedFromCache"]     = (LLSD::Integer)mTotalBytesLoadedFromCache.value();
	(*sd)[currentLabel]["TotalBytesLoadedForLargeImage"] = (LLSD::Integer)mTotalBytesLoadedForLargeImage.value();
	(*sd)[currentLabel]["TotalBytesLoadedForSculpties"]  = (LLSD::Integer)mTotalBytesLoadedForSculpties.value();

	(*sd)[currentLabel]["StartFetchingTime"]             = (LLSD::Real)mStartFetchingTime;
	(*sd)[currentLabel]["TotalGrayTime"]                 = (LLSD::Real)mTotalGrayTime;
	(*sd)[currentLabel]["TotalStablizingTime"]           = (LLSD::Real)mTotalStablizingTime;

	(*sd)[currentLabel]["StartTimeLoadingSculpties"]     = (LLSD::Real)mStartTimeLoadingSculpties;
	(*sd)[currentLabel]["EndTimeLoadingSculpties"]       = (LLSD::Real)mEndTimeLoadingSculpties;

	(*sd)[currentLabel]["Time"]                          = LLImageGL::sLastFrameTime;
	(*sd)[currentLabel]["TotalBytesBound"]               = (LLSD::Integer)mLastTotalBytesUsed.value();
	(*sd)[currentLabel]["TotalBytesBoundForLargeImage"]  = (LLSD::Integer)mLastTotalBytesUsedForLargeImage.value();
	(*sd)[currentLabel]["PercentageBytesBound"]          = (LLSD::Real)(100.f * mLastTotalBytesUsed / mTotalBytesLoaded);
}

void LLTexturePipelineTester::updateTextureBindingStats(const LLViewerTexture* imagep) 
{
	U32Bytes mem_size = imagep->getTextureMemory();
	mTotalBytesUsed += mem_size; 

	if(MIN_LARGE_IMAGE_AREA <= (U32)(mem_size.value() / (U32)imagep->getComponents()))
	{
		mTotalBytesUsedForLargeImage += mem_size;
	}
}
	
void LLTexturePipelineTester::updateTextureLoadingStats(const LLViewerFetchedTexture* imagep, const LLImageRaw* raw_imagep, BOOL from_cache) 
{
	U32Bytes data_size = (U32Bytes)raw_imagep->getDataSize();
	mTotalBytesLoaded += data_size;

	if(from_cache)
	{
		mTotalBytesLoadedFromCache += data_size;
	}

	if(MIN_LARGE_IMAGE_AREA <= (U32)(data_size.value() / (U32)raw_imagep->getComponents()))
	{
		mTotalBytesLoadedForLargeImage += data_size;
	}

	if(imagep->forSculpt())
	{
		mTotalBytesLoadedForSculpties += data_size;

		if(mStartTimeLoadingSculpties > mEndTimeLoadingSculpties)
		{
			mStartTimeLoadingSculpties = LLImageGL::sLastFrameTime;
		}
		mEndTimeLoadingSculpties = LLImageGL::sLastFrameTime;
	}
}

void LLTexturePipelineTester::updateGrayTextureBinding()
{
	mUsingDefaultTexture = TRUE;
}

void LLTexturePipelineTester::setStablizingTime()
{
	if(mStartStablizingTime <= mStartFetchingTime)
	{
		mStartStablizingTime = LLImageGL::sLastFrameTime;
	}
	mEndStablizingTime = LLImageGL::sLastFrameTime;
}

void LLTexturePipelineTester::updateStablizingTime()
{
	if(mStartStablizingTime > mStartFetchingTime)
	{
		F32 t = mEndStablizingTime - mStartStablizingTime;

		if(t > F_ALMOST_ZERO && (t - mTotalStablizingTime) < F_ALMOST_ZERO)
		{
			//already stablized
			mTotalStablizingTime = LLImageGL::sLastFrameTime - mStartStablizingTime;

			//cancel the timer
			mStartStablizingTime = 0.f;
			mEndStablizingTime = 0.f;
		}
		else
		{
			mTotalStablizingTime = t;
		}
	}
	mTotalStablizingTime = 0.f;
}

//virtual 
void LLTexturePipelineTester::compareTestSessions(llofstream* os) 
{	
	LLTexturePipelineTester::LLTextureTestSession* base_sessionp = dynamic_cast<LLTexturePipelineTester::LLTextureTestSession*>(mBaseSessionp);
	LLTexturePipelineTester::LLTextureTestSession* current_sessionp = dynamic_cast<LLTexturePipelineTester::LLTextureTestSession*>(mCurrentSessionp);
	if(!base_sessionp || !current_sessionp)
	{
		LL_ERRS() << "type of test session does not match!" << LL_ENDL;
	}

	//compare and output the comparison
	*os << llformat("%s\n", getTesterName().c_str());
	*os << llformat("AggregateResults\n");

	compareTestResults(os, "TotalGrayTime", base_sessionp->mTotalGrayTime, current_sessionp->mTotalGrayTime);
	compareTestResults(os, "TotalStablizingTime", base_sessionp->mTotalStablizingTime, current_sessionp->mTotalStablizingTime);
	compareTestResults(os, "StartTimeLoadingSculpties", base_sessionp->mStartTimeLoadingSculpties, current_sessionp->mStartTimeLoadingSculpties);		
	compareTestResults(os, "TotalTimeLoadingSculpties", base_sessionp->mTotalTimeLoadingSculpties, current_sessionp->mTotalTimeLoadingSculpties);
	
	compareTestResults(os, "TotalBytesLoaded", base_sessionp->mTotalBytesLoaded, current_sessionp->mTotalBytesLoaded);
	compareTestResults(os, "TotalBytesLoadedFromCache", base_sessionp->mTotalBytesLoadedFromCache, current_sessionp->mTotalBytesLoadedFromCache);
	compareTestResults(os, "TotalBytesLoadedForLargeImage", base_sessionp->mTotalBytesLoadedForLargeImage, current_sessionp->mTotalBytesLoadedForLargeImage);
	compareTestResults(os, "TotalBytesLoadedForSculpties", base_sessionp->mTotalBytesLoadedForSculpties, current_sessionp->mTotalBytesLoadedForSculpties);
		
	*os << llformat("InstantResults\n");
	S32 size = llmin(base_sessionp->mInstantPerformanceListCounter, current_sessionp->mInstantPerformanceListCounter);
	for(S32 i = 0; i < size; i++)
	{
		*os << llformat("Time(B-T)-%.4f-%.4f\n", base_sessionp->mInstantPerformanceList[i].mTime, current_sessionp->mInstantPerformanceList[i].mTime);

		compareTestResults(os, "AverageBytesUsedPerSecond", base_sessionp->mInstantPerformanceList[i].mAverageBytesUsedPerSecond,
			current_sessionp->mInstantPerformanceList[i].mAverageBytesUsedPerSecond);
			
		compareTestResults(os, "AverageBytesUsedForLargeImagePerSecond", base_sessionp->mInstantPerformanceList[i].mAverageBytesUsedForLargeImagePerSecond,
			current_sessionp->mInstantPerformanceList[i].mAverageBytesUsedForLargeImagePerSecond);
			
		compareTestResults(os, "AveragePercentageBytesUsedPerSecond", base_sessionp->mInstantPerformanceList[i].mAveragePercentageBytesUsedPerSecond,
			current_sessionp->mInstantPerformanceList[i].mAveragePercentageBytesUsedPerSecond);
	}
	
	if(size < base_sessionp->mInstantPerformanceListCounter)
	{
		for(S32 i = size; i < base_sessionp->mInstantPerformanceListCounter; i++)
		{
			*os << llformat("Time(B-T)-%.4f- \n", base_sessionp->mInstantPerformanceList[i].mTime);

			*os << llformat(", AverageBytesUsedPerSecond, %d, N/A \n", base_sessionp->mInstantPerformanceList[i].mAverageBytesUsedPerSecond);
			*os << llformat(", AverageBytesUsedForLargeImagePerSecond, %d, N/A \n", base_sessionp->mInstantPerformanceList[i].mAverageBytesUsedForLargeImagePerSecond);				
			*os << llformat(", AveragePercentageBytesUsedPerSecond, %.4f, N/A \n", base_sessionp->mInstantPerformanceList[i].mAveragePercentageBytesUsedPerSecond);			
		}
	}
	else if(size < current_sessionp->mInstantPerformanceListCounter)
	{
		for(S32 i = size; i < current_sessionp->mInstantPerformanceListCounter; i++)
		{
			*os << llformat("Time(B-T)- -%.4f\n", current_sessionp->mInstantPerformanceList[i].mTime);

			*os << llformat(", AverageBytesUsedPerSecond, N/A, %d\n", current_sessionp->mInstantPerformanceList[i].mAverageBytesUsedPerSecond);
			*os << llformat(", AverageBytesUsedForLargeImagePerSecond, N/A, %d\n", current_sessionp->mInstantPerformanceList[i].mAverageBytesUsedForLargeImagePerSecond);				
			*os << llformat(", AveragePercentageBytesUsedPerSecond, N/A, %.4f\n", current_sessionp->mInstantPerformanceList[i].mAveragePercentageBytesUsedPerSecond);			
		}
	}
}

//virtual 
LLMetricPerformanceTesterWithSession::LLTestSession* LLTexturePipelineTester::loadTestSession(LLSD* log)
{
	LLTexturePipelineTester::LLTextureTestSession* sessionp = new LLTexturePipelineTester::LLTextureTestSession();
	if(!sessionp)
	{
		return NULL;
	}
	
	F32 total_gray_time = 0.f;
	F32 total_stablizing_time = 0.f;
	F32 total_loading_sculpties_time = 0.f;

	F32 start_fetching_time = -1.f;
	F32 start_fetching_sculpties_time = 0.f;

	F32 last_time = 0.0f;
	S32 frame_count = 0;

	sessionp->mInstantPerformanceListCounter = 0;
	sessionp->mInstantPerformanceList.resize(128);
	sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAverageBytesUsedPerSecond = 0;
	sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAverageBytesUsedForLargeImagePerSecond = 0;
	sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAveragePercentageBytesUsedPerSecond = 0.f;
	sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mTime = 0.f;
	
	//load a session
	std::string currentLabel = getCurrentLabelName();
	BOOL in_log = (*log).has(currentLabel);
	while (in_log)
	{
		LLSD::String label = currentLabel;		

		if(sessionp->mInstantPerformanceListCounter >= (S32)sessionp->mInstantPerformanceList.size())
		{
			sessionp->mInstantPerformanceList.resize(sessionp->mInstantPerformanceListCounter + 128);
		}
		
		//time
		F32 start_time = (*log)[label]["StartFetchingTime"].asReal();
		F32 cur_time   = (*log)[label]["Time"].asReal();
		if(start_time - start_fetching_time > F_ALMOST_ZERO) //fetching has paused for a while
		{
			sessionp->mTotalGrayTime += total_gray_time;
			sessionp->mTotalStablizingTime += total_stablizing_time;

			sessionp->mStartTimeLoadingSculpties = start_fetching_sculpties_time; 
			sessionp->mTotalTimeLoadingSculpties += total_loading_sculpties_time;

			start_fetching_time = start_time;
			total_gray_time = 0.f;
			total_stablizing_time = 0.f;
			total_loading_sculpties_time = 0.f;
		}
		else
		{
			total_gray_time = (*log)[label]["TotalGrayTime"].asReal();
			total_stablizing_time = (*log)[label]["TotalStablizingTime"].asReal();

			total_loading_sculpties_time = (*log)[label]["EndTimeLoadingSculpties"].asReal() - (*log)[label]["StartTimeLoadingSculpties"].asReal();
			if(start_fetching_sculpties_time < 0.f && total_loading_sculpties_time > 0.f)
			{
				start_fetching_sculpties_time = (*log)[label]["StartTimeLoadingSculpties"].asReal();
			}			
		}
		
		//total loaded bytes
		sessionp->mTotalBytesLoaded = (*log)[label]["TotalBytesLoaded"].asInteger(); 
		sessionp->mTotalBytesLoadedFromCache = (*log)[label]["TotalBytesLoadedFromCache"].asInteger();
		sessionp->mTotalBytesLoadedForLargeImage = (*log)[label]["TotalBytesLoadedForLargeImage"].asInteger();
		sessionp->mTotalBytesLoadedForSculpties = (*log)[label]["TotalBytesLoadedForSculpties"].asInteger(); 

		//instant metrics			
		sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAverageBytesUsedPerSecond +=
			(*log)[label]["TotalBytesBound"].asInteger();
		sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAverageBytesUsedForLargeImagePerSecond +=
			(*log)[label]["TotalBytesBoundForLargeImage"].asInteger();
		sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAveragePercentageBytesUsedPerSecond +=
			(*log)[label]["PercentageBytesBound"].asReal();
		frame_count++;
		if(cur_time - last_time >= 1.0f)
		{
			sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAverageBytesUsedPerSecond /= frame_count;
			sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAverageBytesUsedForLargeImagePerSecond /= frame_count;
			sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAveragePercentageBytesUsedPerSecond /= frame_count;
			sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mTime = last_time;

			frame_count = 0;
			last_time = cur_time;
			sessionp->mInstantPerformanceListCounter++;
			sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAverageBytesUsedPerSecond = 0;
			sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAverageBytesUsedForLargeImagePerSecond = 0;
			sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mAveragePercentageBytesUsedPerSecond = 0.f;
			sessionp->mInstantPerformanceList[sessionp->mInstantPerformanceListCounter].mTime = 0.f;
		}
		// Next label
		incrementCurrentCount();
		currentLabel = getCurrentLabelName();
		in_log = (*log).has(currentLabel);
	}

	sessionp->mTotalGrayTime += total_gray_time;
	sessionp->mTotalStablizingTime += total_stablizing_time;

	if(sessionp->mStartTimeLoadingSculpties < 0.f)
	{
		sessionp->mStartTimeLoadingSculpties = start_fetching_sculpties_time; 
	}
	sessionp->mTotalTimeLoadingSculpties += total_loading_sculpties_time;

	return sessionp;
}

LLTexturePipelineTester::LLTextureTestSession::LLTextureTestSession() 
{
	reset();
}
LLTexturePipelineTester::LLTextureTestSession::~LLTextureTestSession() 
{
}
void LLTexturePipelineTester::LLTextureTestSession::reset() 
{
	mTotalGrayTime = 0.0f;
	mTotalStablizingTime = 0.0f;

	mStartTimeLoadingSculpties = 0.0f; 
	mTotalTimeLoadingSculpties = 0.0f;

	mTotalBytesLoaded = 0; 
	mTotalBytesLoadedFromCache = 0;
	mTotalBytesLoadedForLargeImage = 0;
	mTotalBytesLoadedForSculpties = 0; 

	mInstantPerformanceListCounter = 0;
}
//----------------------------------------------------------------------------------------------
//end of LLTexturePipelineTester
//----------------------------------------------------------------------------------------------