/** 
 * @file llviewerdisplay.cpp
 * @brief LLViewerDisplay class implementation
 *
 * $LicenseInfo:firstyear=2004&license=viewergpl$
 * 
 * Copyright (c) 2004-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include "llviewerdisplay.h"

#include "llgl.h"
#include "llrender.h"
#include "llglheaders.h"
#include "llagent.h"
#include "llagentcamera.h"
#include "llviewercontrol.h"
#include "llcoord.h"
#include "llcriticaldamp.h"
#include "lldir.h"
#include "lldynamictexture.h"
#include "lldrawpoolalpha.h"
#include "llfeaturemanager.h"
//#include "llfirstuse.h"
#include "llhudmanager.h"
#include "llimagebmp.h"
#include "llmemory.h"
#include "llselectmgr.h"
#include "llsky.h"
#include "llstartup.h"
#include "lltoolfocus.h"
#include "lltoolmgr.h"
#include "lltooldraganddrop.h"
#include "lltoolpie.h"
#include "lltracker.h"
#include "lltrans.h"
#include "llui.h"
#include "llviewercamera.h"
#include "llviewerobjectlist.h"
#include "llviewerparcelmgr.h"
#include "llviewerwindow.h"
#include "llvoavatarself.h"
#include "llvograss.h"
#include "llworld.h"
#include "pipeline.h"
#include "llspatialpartition.h"
#include "llappviewer.h"
#include "llstartup.h"
#include "llviewershadermgr.h"
#include "llfasttimer.h"
#include "llfloatertools.h"
#include "llviewertexturelist.h"
#include "llfocusmgr.h"
#include "llcubemap.h"
#include "llviewerregion.h"
#include "lldrawpoolwater.h"
#include "lldrawpoolbump.h"
#include "llwlparammanager.h"
#include "llwaterparammanager.h"
#include "llpostprocess.h"

extern LLPointer<LLViewerTexture> gStartTexture;

LLPointer<LLViewerTexture> gDisconnectedImagep = NULL;

// used to toggle renderer back on after teleport
const F32 TELEPORT_RENDER_DELAY = 20.f; // Max time a teleport is allowed to take before we raise the curtain
const F32 TELEPORT_ARRIVAL_DELAY = 2.f; // Time to preload the world before raising the curtain after we've actually already arrived.
BOOL		 gTeleportDisplay = FALSE;
LLFrameTimer gTeleportDisplayTimer;
LLFrameTimer gTeleportArrivalTimer;
const F32		RESTORE_GL_TIME = 5.f;	// Wait this long while reloading textures before we raise the curtain

BOOL gForceRenderLandFence = FALSE;
BOOL gDisplaySwapBuffers = FALSE;
BOOL gDepthDirty = FALSE;
BOOL gResizeScreenTexture = FALSE;
BOOL gSnapshot = FALSE;

U32 gRecentFrameCount = 0; // number of 'recent' frames
LLFrameTimer gRecentFPSTime;
LLFrameTimer gRecentMemoryTime;

// Rendering stuff
void pre_show_depth_buffer();
void post_show_depth_buffer();
void render_ui(F32 zoom_factor = 1.f, int subfield = 0);
void render_hud_attachments();
void render_ui_3d();
void render_ui_2d();
void render_disconnected_background();

void display_startup()
{
	if (   !gViewerWindow->getActive()
		|| !gViewerWindow->mWindow->getVisible() 
		|| gViewerWindow->mWindow->getMinimized()
		|| gNoRender )
	{
		return; 
	}

	gPipeline.updateGL();

	// Update images?
	//gImageList.updateImages(0.01f);
	
	LLGLSDefault gls_default;

	// Required for HTML update in login screen
	static S32 frame_count = 0;

	LLGLState::checkStates();
	LLGLState::checkTextureChannels();

	if (frame_count++ > 1) // make sure we have rendered a frame first
	{
		LLViewerDynamicTexture::updateAllInstances();
	}

	LLGLState::checkStates();
	LLGLState::checkTextureChannels();

	glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
	LLGLSUIDefault gls_ui;
	gPipeline.disableLights();

	gViewerWindow->setup2DRender();
	gGL.getTexUnit(0)->setTextureBlendType(LLTexUnit::TB_MULT);

	gGL.color4f(1,1,1,1);
	gViewerWindow->draw();
	gGL.flush();

	LLVertexBuffer::unbind();

	LLGLState::checkStates();
	LLGLState::checkTextureChannels();

	gViewerWindow->mWindow->swapBuffers();
	glClear(GL_DEPTH_BUFFER_BIT);
}

void display_update_camera()
{
	LLMemType mt_uc(LLMemType::MTYPE_DISPLAY_UPDATE_CAMERA);
	// TODO: cut draw distance down if customizing avatar?
	// TODO: cut draw distance on per-parcel basis?

	// Cut draw distance in half when customizing avatar,
	// but on the viewer only.
	F32 final_far = gAgentCamera.mDrawDistance;
	if (CAMERA_MODE_CUSTOMIZE_AVATAR == gAgentCamera.getCameraMode())
	{
		final_far *= 0.5f;
	}
	LLViewerCamera::getInstance()->setFar(final_far);
	gViewerWindow->setup3DRender();
	
	// update all the sky/atmospheric/water settings
	LLWLParamManager::instance()->update(LLViewerCamera::getInstance());
	LLWaterParamManager::instance()->update(LLViewerCamera::getInstance());

	// Update land visibility too
	LLWorld::getInstance()->setLandFarClip(final_far);
}

// Write some stats to llinfos
void display_stats()
{
	F32 fps_log_freq = gSavedSettings.getF32("FPSLogFrequency");
	if (fps_log_freq > 0.f && gRecentFPSTime.getElapsedTimeF32() >= fps_log_freq)
	{
		F32 fps = gRecentFrameCount / fps_log_freq;
		llinfos << llformat("FPS: %.02f", fps) << llendl;
		gRecentFrameCount = 0;
		gRecentFPSTime.reset();
	}
	F32 mem_log_freq = gSavedSettings.getF32("MemoryLogFrequency");
	if (mem_log_freq > 0.f && gRecentMemoryTime.getElapsedTimeF32() >= mem_log_freq)
	{
		gMemoryAllocated = LLMemory::getCurrentRSS();
		U32 memory = (U32)(gMemoryAllocated / (1024*1024));
		llinfos << llformat("MEMORY: %d MB", memory) << llendl;
		gRecentMemoryTime.reset();
	}
}

static LLFastTimer::DeclareTimer FTM_PICK("Picking");
static LLFastTimer::DeclareTimer FTM_RENDER("Render", true);
static LLFastTimer::DeclareTimer FTM_UPDATE_SKY("Update Sky");
static LLFastTimer::DeclareTimer FTM_UPDATE_TEXTURES("Update Textures");
static LLFastTimer::DeclareTimer FTM_IMAGE_UPDATE("Update Images");

// Paint the display!
void display(BOOL rebuild, F32 zoom_factor, int subfield, BOOL for_snapshot)
{
	LLMemType mt_render(LLMemType::MTYPE_RENDER);
	LLFastTimer t(FTM_RENDER);

	if (LLPipeline::sRenderFrameTest)
	{
		send_agent_pause();
	}

	gSnapshot = for_snapshot;

	LLGLSDefault gls_default;
	LLGLDepthTest gls_depth(GL_TRUE, GL_TRUE, GL_LEQUAL);
	
	LLVertexBuffer::unbind();

	LLGLState::checkStates();
	LLGLState::checkTextureChannels();
	
	stop_glerror();

	gPipeline.disableLights();
	
	stop_glerror();

	// Don't draw if the window is hidden or minimized.
	// In fact, must explicitly check the minimized state before drawing.
	// Attempting to draw into a minimized window causes a GL error. JC
	if (   !gViewerWindow->getActive()
		|| !gViewerWindow->mWindow->getVisible() 
		|| gViewerWindow->mWindow->getMinimized() )
	{
		// Clean up memory the pools may have allocated
		if (rebuild)
		{
			stop_glerror();
			gPipeline.rebuildPools();
			stop_glerror();
		}

		stop_glerror();
		gViewerWindow->returnEmptyPicks();
		stop_glerror();
		return; 
	}

	gViewerWindow->checkSettings();
	
	{
		LLFastTimer ftm(FTM_PICK);
		LLAppViewer::instance()->pingMainloopTimeout("Display:Pick");
		gViewerWindow->performPick();
	}
	
	LLAppViewer::instance()->pingMainloopTimeout("Display:CheckStates");
	LLGLState::checkStates();
	LLGLState::checkTextureChannels();
	
	//////////////////////////////////////////////////////////
	//
	// Logic for forcing window updates if we're in drone mode.
	//

	if (gNoRender) 
	{
#if LL_WINDOWS
		static F32 last_update_time = 0.f;
		if ((gFrameTimeSeconds - last_update_time) > 1.f)
		{
			InvalidateRect((HWND)gViewerWindow->getPlatformWindow(), NULL, FALSE);
			last_update_time = gFrameTimeSeconds;
		}
#elif LL_DARWIN
		// MBW -- Do something clever here.
#endif
		// Not actually rendering, don't bother.
		return;
	}


	//
	// Bail out if we're in the startup state and don't want to try to
	// render the world.
	//
	if (LLStartUp::getStartupState() < STATE_STARTED)
	{
		LLAppViewer::instance()->pingMainloopTimeout("Display:Startup");
		display_startup();
		return;
	}

	//LLGLState::verify(FALSE);

	/////////////////////////////////////////////////
	//
	// Update GL Texture statistics (used for discard logic?)
	//

	LLAppViewer::instance()->pingMainloopTimeout("Display:TextureStats");
	stop_glerror();

	LLImageGL::updateStats(gFrameTimeSeconds);
	
	LLVOAvatar::sRenderName = gSavedSettings.getS32("AvatarNameTagMode");
	LLVOAvatar::sRenderGroupTitles = (gSavedSettings.getBOOL("RenderShowGroupTitleAll") && gSavedSettings.getS32("AvatarNameTagMode"));
	
	gPipeline.mBackfaceCull = TRUE;
	gFrameCount++;
	gRecentFrameCount++;
	if (gFocusMgr.getAppHasFocus())
	{
		gForegroundFrameCount++;
	}

	//////////////////////////////////////////////////////////
	//
	// Display start screen if we're teleporting, and skip render
	//

	if (gTeleportDisplay)
	{
		LLAppViewer::instance()->pingMainloopTimeout("Display:Teleport");
		const F32 TELEPORT_ARRIVAL_DELAY = 2.f; // Time to preload the world before raising the curtain after we've actually already arrived.

		S32 attach_count = 0;
		if (isAgentAvatarValid())
		{
			attach_count = gAgentAvatarp->getAttachmentCount();
		}
		F32 teleport_save_time = TELEPORT_EXPIRY + TELEPORT_EXPIRY_PER_ATTACHMENT * attach_count;
		F32 teleport_elapsed = gTeleportDisplayTimer.getElapsedTimeF32();
		F32 teleport_percent = teleport_elapsed * (100.f / teleport_save_time);
		if( (gAgent.getTeleportState() != LLAgent::TELEPORT_START) && (teleport_percent > 100.f) )
		{
			// Give up.  Don't keep the UI locked forever.
			gAgent.setTeleportState( LLAgent::TELEPORT_NONE );
			gAgent.setTeleportMessage(std::string());
		}

		const std::string& message = gAgent.getTeleportMessage();
		switch( gAgent.getTeleportState() )
		{
		case LLAgent::TELEPORT_START:
			// Transition to REQUESTED.  Viewer has sent some kind
			// of TeleportRequest to the source simulator
			gTeleportDisplayTimer.reset();
			gViewerWindow->setShowProgress(TRUE);
			gViewerWindow->setProgressPercent(0);
			gAgent.setTeleportState( LLAgent::TELEPORT_REQUESTED );
			gAgent.setTeleportMessage(
				LLAgent::sTeleportProgressMessages["requesting"]);
			break;

		case LLAgent::TELEPORT_REQUESTED:
			// Waiting for source simulator to respond
			gViewerWindow->setProgressPercent( llmin(teleport_percent, 37.5f) );
			gViewerWindow->setProgressString(message);
			break;

		case LLAgent::TELEPORT_MOVING:
			// Viewer has received destination location from source simulator
			gViewerWindow->setProgressPercent( llmin(teleport_percent, 75.f) );
			gViewerWindow->setProgressString(message);
			break;

		case LLAgent::TELEPORT_START_ARRIVAL:
			// Transition to ARRIVING.  Viewer has received avatar update, etc., from destination simulator
			gTeleportArrivalTimer.reset();
				gViewerWindow->setProgressCancelButtonVisible(FALSE, LLTrans::getString("Cancel"));
			gViewerWindow->setProgressPercent(75.f);
			gAgent.setTeleportState( LLAgent::TELEPORT_ARRIVING );
			gAgent.setTeleportMessage(
				LLAgent::sTeleportProgressMessages["arriving"]);
			gTextureList.mForceResetTextureStats = TRUE;
			gAgentCamera.resetView(TRUE, TRUE);
			break;

		case LLAgent::TELEPORT_ARRIVING:
			// Make the user wait while content "pre-caches"
			{
				F32 arrival_fraction = (gTeleportArrivalTimer.getElapsedTimeF32() / TELEPORT_ARRIVAL_DELAY);
				if( arrival_fraction > 1.f )
				{
					arrival_fraction = 1.f;
					//LLFirstUse::useTeleport();
					gAgent.setTeleportState( LLAgent::TELEPORT_NONE );
				}
				gViewerWindow->setProgressCancelButtonVisible(FALSE, LLTrans::getString("Cancel"));
				gViewerWindow->setProgressPercent(  arrival_fraction * 25.f + 75.f);
				gViewerWindow->setProgressString(message);
			}
			break;

		case LLAgent::TELEPORT_NONE:
			// No teleport in progress
			gViewerWindow->setShowProgress(FALSE);
			gTeleportDisplay = FALSE;
			break;
		}
	}
    else if(LLAppViewer::instance()->logoutRequestSent())
	{
		LLAppViewer::instance()->pingMainloopTimeout("Display:Logout");
		F32 percent_done = gLogoutTimer.getElapsedTimeF32() * 100.f / gLogoutMaxTime;
		if (percent_done > 100.f)
		{
			percent_done = 100.f;
		}

		if( LLApp::isExiting() )
		{
			percent_done = 100.f;
		}
		
		gViewerWindow->setProgressPercent( percent_done );
	}
	else
	if (gRestoreGL)
	{
		LLAppViewer::instance()->pingMainloopTimeout("Display:RestoreGL");
		F32 percent_done = gRestoreGLTimer.getElapsedTimeF32() * 100.f / RESTORE_GL_TIME;
		if( percent_done > 100.f )
		{
			gViewerWindow->setShowProgress(FALSE);
			gRestoreGL = FALSE;
		}
		else
		{

			if( LLApp::isExiting() )
			{
				percent_done = 100.f;
			}
			
			gViewerWindow->setProgressPercent( percent_done );
		}
	}

	//////////////////////////
	//
	// Prepare for the next frame
	//

	/////////////////////////////
	//
	// Update the camera
	//
	//

	LLAppViewer::instance()->pingMainloopTimeout("Display:Camera");
	LLViewerCamera::getInstance()->setZoomParameters(zoom_factor, subfield);
	LLViewerCamera::getInstance()->setNear(MIN_NEAR_PLANE);

	//////////////////////////
	//
	// clear the next buffer
	// (must follow dynamic texture writing since that uses the frame buffer)
	//

	if (gDisconnected)
	{
		LLAppViewer::instance()->pingMainloopTimeout("Display:Disconnected");
		render_ui();
	}
	
	//////////////////////////
	//
	// Set rendering options
	//
	//
	LLAppViewer::instance()->pingMainloopTimeout("Display:RenderSetup");
	stop_glerror();

	///////////////////////////////////////
	//
	// Slam lighting parameters back to our defaults.
	// Note that these are not the same as GL defaults...

	stop_glerror();
	F32 one[4] =	{1.f, 1.f, 1.f, 1.f};
	glLightModelfv (GL_LIGHT_MODEL_AMBIENT,one);
	stop_glerror();
		
	/////////////////////////////////////
	//
	// Render
	//
	// Actually push all of our triangles to the screen.
	//

	// do render-to-texture stuff here
	if (gPipeline.hasRenderDebugFeatureMask(LLPipeline::RENDER_DEBUG_FEATURE_DYNAMIC_TEXTURES))
	{
		LLAppViewer::instance()->pingMainloopTimeout("Display:DynamicTextures");
		LLFastTimer t(FTM_UPDATE_TEXTURES);
		if (LLViewerDynamicTexture::updateAllInstances())
		{
			gGL.setColorMask(true, true);
			glClear(GL_DEPTH_BUFFER_BIT);
		}
	}

	gViewerWindow->setup3DViewport();

	gPipeline.resetFrameStats();	// Reset per-frame statistics.
	if (!gDisconnected)
	{
		LLMemType mt_du(LLMemType::MTYPE_DISPLAY_UPDATE);
		LLAppViewer::instance()->pingMainloopTimeout("Display:Update");
		if (gPipeline.hasRenderType(LLPipeline::RENDER_TYPE_HUD))
		{ //don't draw hud objects in this frame
			gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_HUD);
		}

		if (gPipeline.hasRenderType(LLPipeline::RENDER_TYPE_HUD_PARTICLES))
		{ //don't draw hud particles in this frame
			gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_HUD_PARTICLES);
		}

		//upkeep gl name pools
		LLGLNamePool::upkeepPools();
		
		stop_glerror();
		display_update_camera();
		stop_glerror();
				
		// *TODO: merge these two methods
		{
			LLMemType mt_uh(LLMemType::MTYPE_DISPLAY_UPDATE_HUD);
			LLHUDManager::getInstance()->updateEffects();
			LLHUDObject::updateAll();
			stop_glerror();
		}

		{
			LLMemType mt_ug(LLMemType::MTYPE_DISPLAY_UPDATE_GEOM);
			const F32 max_geom_update_time = 0.005f*10.f*gFrameIntervalSeconds; // 50 ms/second update time
			gPipeline.createObjects(max_geom_update_time);
			gPipeline.updateGeom(max_geom_update_time);
			stop_glerror();
		}

		gPipeline.updateGL();
		stop_glerror();

		S32 water_clip = 0;
		if ((LLViewerShaderMgr::instance()->getVertexShaderLevel(LLViewerShaderMgr::SHADER_ENVIRONMENT) > 1) &&
			 gPipeline.hasRenderType(LLPipeline::RENDER_TYPE_WATER))
		{
			if (LLViewerCamera::getInstance()->cameraUnderWater())
			{
				water_clip = -1;
			}
			else
			{
				water_clip = 1;
			}
		}
		
		LLAppViewer::instance()->pingMainloopTimeout("Display:Cull");
		
		//Increment drawable frame counter
		LLDrawable::incrementVisible();

		LLSpatialGroup::sNoDelete = TRUE;
		LLPipeline::sUseOcclusion = 
				(!gUseWireframe
				&& LLFeatureManager::getInstance()->isFeatureAvailable("UseOcclusion") 
				&& gSavedSettings.getBOOL("UseOcclusion") 
				&& gGLManager.mHasOcclusionQuery) ? 2 : 0;

		if (LLPipeline::sUseOcclusion && LLPipeline::sRenderDeferred)
		{ //force occlusion on for all render types if doing deferred render
			LLPipeline::sUseOcclusion = 3;
		}

		LLPipeline::sAutoMaskAlphaDeferred = gSavedSettings.getBOOL("RenderAutoMaskAlphaDeferred");
		LLPipeline::sAutoMaskAlphaNonDeferred = gSavedSettings.getBOOL("RenderAutoMaskAlphaNonDeferred");
		LLPipeline::sUseFarClip = gSavedSettings.getBOOL("RenderUseFarClip");
		LLVOAvatar::sMaxVisible = gSavedSettings.getS32("RenderAvatarMaxVisible");
		LLPipeline::sDelayVBUpdate = gSavedSettings.getBOOL("RenderDelayVBUpdate");

		S32 occlusion = LLPipeline::sUseOcclusion;
		if (gDepthDirty)
		{ //depth buffer is invalid, don't overwrite occlusion state
			LLPipeline::sUseOcclusion = llmin(occlusion, 1);
		}
		gDepthDirty = FALSE;

		LLGLState::checkStates();
		LLGLState::checkTextureChannels();
		LLGLState::checkClientArrays();

		static LLCullResult result;
		LLViewerCamera::sCurCameraID = LLViewerCamera::CAMERA_WORLD;
		gPipeline.updateCull(*LLViewerCamera::getInstance(), result, water_clip);
		stop_glerror();

		LLGLState::checkStates();
		LLGLState::checkTextureChannels();
		LLGLState::checkClientArrays();

		BOOL to_texture = !for_snapshot &&
						gPipeline.canUseVertexShaders() &&
						LLPipeline::sRenderGlow;

		LLAppViewer::instance()->pingMainloopTimeout("Display:Swap");
		
		{ 
			LLMemType mt_ds(LLMemType::MTYPE_DISPLAY_SWAP);
			{
 				LLFastTimer ftm(FTM_CLIENT_COPY);
				LLVertexBuffer::clientCopy(0.016);
			}

			if (gResizeScreenTexture)
			{
				gResizeScreenTexture = FALSE;
				gPipeline.resizeScreenTexture();
			}

			gGL.setColorMask(true, true);
			glClearColor(0,0,0,0);

			LLGLState::checkStates();
			LLGLState::checkTextureChannels();
			LLGLState::checkClientArrays();

			if (!for_snapshot)
			{
				if (gFrameCount > 1)
				{ //for some reason, ATI 4800 series will error out if you 
				  //try to generate a shadow before the first frame is through
					gPipeline.generateSunShadow(*LLViewerCamera::getInstance());
				}

				LLVertexBuffer::unbind();

				LLGLState::checkStates();
				LLGLState::checkTextureChannels();
				LLGLState::checkClientArrays();

				glh::matrix4f proj = glh_get_current_projection();
				glh::matrix4f mod = glh_get_current_modelview();
				glViewport(0,0,512,512);
				LLVOAvatar::updateFreezeCounter() ;
				LLVOAvatar::updateImpostors();

				glh_set_current_projection(proj);
				glh_set_current_modelview(mod);
				glMatrixMode(GL_PROJECTION);
				glLoadMatrixf(proj.m);
				glMatrixMode(GL_MODELVIEW);
				glLoadMatrixf(mod.m);
				gViewerWindow->setup3DViewport();

				LLGLState::checkStates();
				LLGLState::checkTextureChannels();
				LLGLState::checkClientArrays();

			}
			glClear(GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
		}

		if (!for_snapshot)
		{
			LLMemType mt_gw(LLMemType::MTYPE_DISPLAY_GEN_REFLECTION);
			LLAppViewer::instance()->pingMainloopTimeout("Display:Imagery");
			gPipeline.generateWaterReflection(*LLViewerCamera::getInstance());
			gPipeline.generateHighlight(*LLViewerCamera::getInstance());
		}

		//////////////////////////////////////
		//
		// Update images, using the image stats generated during object update/culling
		//
		// Can put objects onto the retextured list.
		//
		// Doing this here gives hardware occlusion queries extra time to complete
		LLAppViewer::instance()->pingMainloopTimeout("Display:UpdateImages");
		LLError::LLCallStacks::clear() ;
		llpushcallstacks ;

		{
			LLMemType mt_iu(LLMemType::MTYPE_DISPLAY_IMAGE_UPDATE);
			LLFastTimer t(FTM_IMAGE_UPDATE);
			
			LLViewerTexture::updateClass(LLViewerCamera::getInstance()->getVelocityStat()->getMean(),
										LLViewerCamera::getInstance()->getAngularVelocityStat()->getMean());

			gBumpImageList.updateImages();  // must be called before gTextureList version so that it's textures are thrown out first.

			F32 max_image_decode_time = 0.050f*gFrameIntervalSeconds; // 50 ms/second decode time
			max_image_decode_time = llclamp(max_image_decode_time, 0.002f, 0.005f ); // min 2ms/frame, max 5ms/frame)
			gTextureList.updateImages(max_image_decode_time);

			//remove dead textures from GL
			LLImageGL::deleteDeadTextures();
			stop_glerror();
		}
		llpushcallstacks ;
		///////////////////////////////////
		//
		// StateSort
		//
		// Responsible for taking visible objects, and adding them to the appropriate draw orders.
		// In the case of alpha objects, z-sorts them first.
		// Also creates special lists for outlines and selected face rendering.
		//
		LLAppViewer::instance()->pingMainloopTimeout("Display:StateSort");
		{
			LLViewerCamera::sCurCameraID = LLViewerCamera::CAMERA_WORLD;
			LLMemType mt_ss(LLMemType::MTYPE_DISPLAY_STATE_SORT);
			gPipeline.stateSort(*LLViewerCamera::getInstance(), result);
			stop_glerror();
				
			if (rebuild)
			{
				//////////////////////////////////////
				//
				// rebuildPools
				//
				//
				gPipeline.rebuildPools();
				stop_glerror();
			}
		}

		LLPipeline::sUseOcclusion = occlusion;

		{
			LLMemType mt_ds(LLMemType::MTYPE_DISPLAY_SKY);
			LLAppViewer::instance()->pingMainloopTimeout("Display:Sky");
			LLFastTimer t(FTM_UPDATE_SKY);	
			gSky.updateSky();
		}

		if(gUseWireframe)
		{
			glClearColor(0.5f, 0.5f, 0.5f, 0.f);
			glClear(GL_COLOR_BUFFER_BIT);
			glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
		}

		LLAppViewer::instance()->pingMainloopTimeout("Display:RenderStart");
		
		//// render frontmost floater opaque for occlusion culling purposes
		//LLFloater* frontmost_floaterp = gFloaterView->getFrontmost();
		//// assumes frontmost floater with focus is opaque
		//if (frontmost_floaterp && gFocusMgr.childHasKeyboardFocus(frontmost_floaterp))
		//{
		//	glMatrixMode(GL_MODELVIEW);
		//	glPushMatrix();
		//	{
		//		gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);

		//		glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE);
		//		glLoadIdentity();

		//		LLRect floater_rect = frontmost_floaterp->calcScreenRect();
		//		// deflate by one pixel so rounding errors don't occlude outside of floater extents
		//		floater_rect.stretch(-1);
		//		LLRectf floater_3d_rect((F32)floater_rect.mLeft / (F32)gViewerWindow->getWindowWidthScaled(), 
		//								(F32)floater_rect.mTop / (F32)gViewerWindow->getWindowHeightScaled(),
		//								(F32)floater_rect.mRight / (F32)gViewerWindow->getWindowWidthScaled(),
		//								(F32)floater_rect.mBottom / (F32)gViewerWindow->getWindowHeightScaled());
		//		floater_3d_rect.translate(-0.5f, -0.5f);
		//		glTranslatef(0.f, 0.f, -LLViewerCamera::getInstance()->getNear());
		//		glScalef(LLViewerCamera::getInstance()->getNear() * LLViewerCamera::getInstance()->getAspect() / sinf(LLViewerCamera::getInstance()->getView()), LLViewerCamera::getInstance()->getNear() / sinf(LLViewerCamera::getInstance()->getView()), 1.f);
		//		gGL.color4fv(LLColor4::white.mV);
		//		gGL.begin(LLVertexBuffer::QUADS);
		//		{
		//			gGL.vertex3f(floater_3d_rect.mLeft, floater_3d_rect.mBottom, 0.f);
		//			gGL.vertex3f(floater_3d_rect.mLeft, floater_3d_rect.mTop, 0.f);
		//			gGL.vertex3f(floater_3d_rect.mRight, floater_3d_rect.mTop, 0.f);
		//			gGL.vertex3f(floater_3d_rect.mRight, floater_3d_rect.mBottom, 0.f);
		//		}
		//		gGL.end();
		//		glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
		//	}
		//	glPopMatrix();
		//}

		LLPipeline::sUnderWaterRender = LLViewerCamera::getInstance()->cameraUnderWater() ? TRUE : FALSE;
		LLPipeline::updateRenderDeferred();
		
		stop_glerror();

		if (to_texture)
		{
			gGL.setColorMask(true, true);
			if (LLPipeline::sRenderDeferred && !LLPipeline::sUnderWaterRender)
			{
				gPipeline.mDeferredScreen.bindTarget();
				glClearColor(0,0,0,0);
				gPipeline.mDeferredScreen.clear();
			}
			else
			{
				gPipeline.mScreen.bindTarget();
				gPipeline.mScreen.clear();
			}
			
			gGL.setColorMask(true, false);
		}
		
		LLAppViewer::instance()->pingMainloopTimeout("Display:RenderGeom");
		
		if (!(LLAppViewer::instance()->logoutRequestSent() && LLAppViewer::instance()->hasSavedFinalSnapshot())
				&& !gRestoreGL)
		{
			LLViewerCamera::sCurCameraID = LLViewerCamera::CAMERA_WORLD;
			LLMemType mt_rg(LLMemType::MTYPE_DISPLAY_RENDER_GEOM);
			gGL.setColorMask(true, false);
			if (LLPipeline::sRenderDeferred && !LLPipeline::sUnderWaterRender)
			{
				gPipeline.renderGeomDeferred(*LLViewerCamera::getInstance());
			}
			else
			{
				gPipeline.renderGeom(*LLViewerCamera::getInstance(), TRUE);
			}
			
			gGL.setColorMask(true, true);

			//store this frame's modelview matrix for use
			//when rendering next frame's occlusion queries
			for (U32 i = 0; i < 16; i++)
			{
				gGLLastModelView[i] = gGLModelView[i];
				gGLLastProjection[i] = gGLProjection[i];
			}
			stop_glerror();
		}

		LLAppViewer::instance()->pingMainloopTimeout("Display:RenderFlush");		
		
		if (to_texture)
		{
			LLMemType mt_rf(LLMemType::MTYPE_DISPLAY_RENDER_FLUSH);
			if (LLPipeline::sRenderDeferred && !LLPipeline::sUnderWaterRender)
			{
				gPipeline.mDeferredScreen.flush();
				if(LLRenderTarget::sUseFBO)
				{
					LLRenderTarget::copyContentsToFramebuffer(gPipeline.mDeferredScreen, 0, 0, gPipeline.mDeferredScreen.getWidth(), 
															  gPipeline.mDeferredScreen.getHeight(), 0, 0, 
															  gPipeline.mDeferredScreen.getWidth(), 
															  gPipeline.mDeferredScreen.getHeight(), 
															  GL_DEPTH_BUFFER_BIT, GL_NEAREST);
				}
			}
			else
			{
				gPipeline.mScreen.flush();
				if(LLRenderTarget::sUseFBO)
				{				
					LLRenderTarget::copyContentsToFramebuffer(gPipeline.mScreen, 0, 0, gPipeline.mScreen.getWidth(), 
															  gPipeline.mScreen.getHeight(), 0, 0, 
															  gPipeline.mScreen.getWidth(), 
															  gPipeline.mScreen.getHeight(), 
															  GL_DEPTH_BUFFER_BIT, GL_NEAREST);
				}
			}
		}

		if (LLPipeline::sRenderDeferred && !LLPipeline::sUnderWaterRender)
		{
			gPipeline.renderDeferredLighting();
		}

		LLPipeline::sUnderWaterRender = FALSE;

		LLAppViewer::instance()->pingMainloopTimeout("Display:RenderUI");
		if (!for_snapshot)
		{
			LLFastTimer t(FTM_RENDER_UI);
			render_ui();
		}

		gPipeline.rebuildGroups();

		LLSpatialGroup::sNoDelete = FALSE;
	}

	LLAppViewer::instance()->pingMainloopTimeout("Display:FrameStats");
	
	stop_glerror();

	if (LLPipeline::sRenderFrameTest)
	{
		send_agent_resume();
		LLPipeline::sRenderFrameTest = FALSE;
	}

	display_stats();
				
	LLAppViewer::instance()->pingMainloopTimeout("Display:Done");
}

void render_hud_attachments()
{
	LLMemType mt_ra(LLMemType::MTYPE_DISPLAY_RENDER_ATTACHMENTS);
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
		
	glh::matrix4f current_proj = glh_get_current_projection();
	glh::matrix4f current_mod = glh_get_current_modelview();

	// clamp target zoom level to reasonable values
	gAgentCamera.mHUDTargetZoom = llclamp(gAgentCamera.mHUDTargetZoom, 0.1f, 1.f);
	// smoothly interpolate current zoom level
	gAgentCamera.mHUDCurZoom = lerp(gAgentCamera.mHUDCurZoom, gAgentCamera.mHUDTargetZoom, LLCriticalDamp::getInterpolant(0.03f));

	if (LLPipeline::sShowHUDAttachments && !gDisconnected && setup_hud_matrices())
	{
		LLCamera hud_cam = *LLViewerCamera::getInstance();
		LLVector3 origin = hud_cam.getOrigin();
		hud_cam.setOrigin(-1.f,0,0);
		hud_cam.setAxes(LLVector3(1,0,0), LLVector3(0,1,0), LLVector3(0,0,1));
		LLViewerCamera::updateFrustumPlanes(hud_cam, TRUE);

		bool render_particles = gPipeline.hasRenderType(LLPipeline::RENDER_TYPE_PARTICLES) && gSavedSettings.getBOOL("RenderHUDParticles");
		
		//only render hud objects
		gPipeline.pushRenderTypeMask();
		
		// turn off everything
		gPipeline.andRenderTypeMask(LLPipeline::END_RENDER_TYPES);
		// turn on HUD
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_HUD);
		// turn on HUD particles
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_HUD_PARTICLES);

		// if particles are off, turn off hud-particles as well
		if (!render_particles)
		{
			// turn back off HUD particles
			gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_HUD_PARTICLES);
		}

		bool has_ui = gPipeline.hasRenderDebugFeatureMask(LLPipeline::RENDER_DEBUG_FEATURE_UI);
		if (has_ui)
		{
			gPipeline.toggleRenderDebugFeature((void*) LLPipeline::RENDER_DEBUG_FEATURE_UI);
		}

		S32 use_occlusion = LLPipeline::sUseOcclusion;
		LLPipeline::sUseOcclusion = 0;
		LLPipeline::sDisableShaders = TRUE;
		
		//cull, sort, and render hud objects
		static LLCullResult result;
		LLSpatialGroup::sNoDelete = TRUE;

		LLViewerCamera::sCurCameraID = LLViewerCamera::CAMERA_WORLD;
		gPipeline.updateCull(hud_cam, result);

		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_BUMP);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_SIMPLE);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_VOLUME);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_ALPHA);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_FULLBRIGHT);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_PASS_ALPHA);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_PASS_ALPHA_MASK);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_PASS_BUMP);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_PASS_FULLBRIGHT);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_PASS_FULLBRIGHT_ALPHA_MASK);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_PASS_FULLBRIGHT_SHINY);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_PASS_SHINY);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_PASS_INVISIBLE);
		gPipeline.toggleRenderType(LLPipeline::RENDER_TYPE_PASS_INVISI_SHINY);
		
		gPipeline.stateSort(hud_cam, result);

		gPipeline.renderGeom(hud_cam);

		LLSpatialGroup::sNoDelete = FALSE;

		render_hud_elements();

		//restore type mask
		gPipeline.popRenderTypeMask();

		if (has_ui)
		{
			gPipeline.toggleRenderDebugFeature((void*) LLPipeline::RENDER_DEBUG_FEATURE_UI);
		}
		LLPipeline::sUseOcclusion = use_occlusion;
		LLPipeline::sDisableShaders = FALSE;
	}
	glMatrixMode(GL_PROJECTION);
	glPopMatrix();
	glMatrixMode(GL_MODELVIEW);
	glPopMatrix();
	
	glh_set_current_projection(current_proj);
	glh_set_current_modelview(current_mod);
}

LLRect get_whole_screen_region()
{
	LLRect whole_screen = gViewerWindow->getWorldViewRectScaled();
	
	// apply camera zoom transform (for high res screenshots)
	F32 zoom_factor = LLViewerCamera::getInstance()->getZoomFactor();
	S16 sub_region = LLViewerCamera::getInstance()->getZoomSubRegion();
	if (zoom_factor > 1.f)
	{
		S32 num_horizontal_tiles = llceil(zoom_factor);
		S32 tile_width = llround((F32)gViewerWindow->getWorldViewWidthScaled() / zoom_factor);
		S32 tile_height = llround((F32)gViewerWindow->getWorldViewHeightScaled() / zoom_factor);
		int tile_y = sub_region / num_horizontal_tiles;
		int tile_x = sub_region - (tile_y * num_horizontal_tiles);
		glh::matrix4f mat;
		
		whole_screen.setLeftTopAndSize(tile_x * tile_width, gViewerWindow->getWorldViewHeightScaled() - (tile_y * tile_height), tile_width, tile_height);
	}
	return whole_screen;
}

bool get_hud_matrices(const LLRect& screen_region, glh::matrix4f &proj, glh::matrix4f &model)
{
	if (isAgentAvatarValid() && gAgentAvatarp->hasHUDAttachment())
	{
		F32 zoom_level = gAgentCamera.mHUDCurZoom;
		LLBBox hud_bbox = gAgentAvatarp->getHUDBBox();
		
		F32 hud_depth = llmax(1.f, hud_bbox.getExtentLocal().mV[VX] * 1.1f);
		proj = gl_ortho(-0.5f * LLViewerCamera::getInstance()->getAspect(), 0.5f * LLViewerCamera::getInstance()->getAspect(), -0.5f, 0.5f, 0.f, hud_depth);
		proj.element(2,2) = -0.01f;
		
		F32 aspect_ratio = LLViewerCamera::getInstance()->getAspect();
		
		glh::matrix4f mat;
		F32 scale_x = (F32)gViewerWindow->getWorldViewWidthScaled() / (F32)screen_region.getWidth();
		F32 scale_y = (F32)gViewerWindow->getWorldViewHeightScaled() / (F32)screen_region.getHeight();
		mat.set_scale(glh::vec3f(scale_x, scale_y, 1.f));
		mat.set_translate(
			glh::vec3f(clamp_rescale((F32)screen_region.getCenterX(), 0.f, (F32)gViewerWindow->getWorldViewWidthScaled(), 0.5f * scale_x * aspect_ratio, -0.5f * scale_x * aspect_ratio),
					   clamp_rescale((F32)screen_region.getCenterY(), 0.f, (F32)gViewerWindow->getWorldViewHeightScaled(), 0.5f * scale_y, -0.5f * scale_y),
					   0.f));
		proj *= mat;
		
		glh::matrix4f tmp_model((GLfloat*) OGL_TO_CFR_ROTATION);
		
		mat.set_scale(glh::vec3f(zoom_level, zoom_level, zoom_level));
		mat.set_translate(glh::vec3f(-hud_bbox.getCenterLocal().mV[VX] + (hud_depth * 0.5f), 0.f, 0.f));
		
		tmp_model *= mat;
		model = tmp_model;		
		return TRUE;
	}
	else
	{
		return FALSE;
	}
}

bool get_hud_matrices(glh::matrix4f &proj, glh::matrix4f &model)
{
	LLRect whole_screen = get_whole_screen_region();
	return get_hud_matrices(whole_screen, proj, model);
}

BOOL setup_hud_matrices()
{
	LLRect whole_screen = get_whole_screen_region();
	return setup_hud_matrices(whole_screen);
}

BOOL setup_hud_matrices(const LLRect& screen_region)
{
	glh::matrix4f proj, model;
	bool result = get_hud_matrices(screen_region, proj, model);
	if (!result) return result;
	
	// set up transform to keep HUD objects in front of camera
	glMatrixMode(GL_PROJECTION);
	glLoadMatrixf(proj.m);
	glh_set_current_projection(proj);
	
	glMatrixMode(GL_MODELVIEW);
	glLoadMatrixf(model.m);
	glh_set_current_modelview(model);
	return TRUE;
}

static LLFastTimer::DeclareTimer FTM_SWAP("Swap");

void render_ui(F32 zoom_factor, int subfield)
{
	LLMemType mt_ru(LLMemType::MTYPE_DISPLAY_RENDER_UI);
	LLGLState::checkStates();
	
	glPushMatrix();
	glLoadMatrixd(gGLLastModelView);
	glh::matrix4f saved_view = glh_get_current_modelview();
	glh_set_current_modelview(glh_copy_matrix(gGLLastModelView));
	
	{
		BOOL to_texture = gPipeline.canUseVertexShaders() &&
							LLPipeline::sRenderGlow;

		if (to_texture)
		{
			gPipeline.renderBloom(gSnapshot, zoom_factor, subfield);
		}
		
		render_hud_elements();
		render_hud_attachments();
	}

	LLGLSDefault gls_default;
	LLGLSUIDefault gls_ui;
	{
		gPipeline.disableLights();
	}

	{
		gGL.color4f(1,1,1,1);
		if (gPipeline.hasRenderDebugFeatureMask(LLPipeline::RENDER_DEBUG_FEATURE_UI))
		{
			LLFastTimer t(FTM_RENDER_UI);

			if (!gDisconnected)
			{
				render_ui_3d();
				LLGLState::checkStates();
			}
			else
			{
				render_disconnected_background();
			}

			render_ui_2d();
			LLGLState::checkStates();
		}
		gGL.flush();

		{
			gViewerWindow->setup2DRender();
			gViewerWindow->updateDebugText();
			gViewerWindow->drawDebugText();
		}

		LLVertexBuffer::unbind();
	}

	glh_set_current_modelview(saved_view);
	glPopMatrix();

	if (gDisplaySwapBuffers)
	{
		LLFastTimer t(FTM_SWAP);
		gViewerWindow->mWindow->swapBuffers();
	}
	gDisplaySwapBuffers = TRUE;
}

void renderCoordinateAxes()
{
	gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
	gGL.begin(LLRender::LINES);
		gGL.color3f(1.0f, 0.0f, 0.0f);   // i direction = X-Axis = red
		gGL.vertex3f(0.0f, 0.0f, 0.0f);
		gGL.vertex3f(2.0f, 0.0f, 0.0f);
		gGL.vertex3f(3.0f, 0.0f, 0.0f);
		gGL.vertex3f(5.0f, 0.0f, 0.0f);
		gGL.vertex3f(6.0f, 0.0f, 0.0f);
		gGL.vertex3f(8.0f, 0.0f, 0.0f);
		// Make an X
		gGL.vertex3f(11.0f, 1.0f, 1.0f);
		gGL.vertex3f(11.0f, -1.0f, -1.0f);
		gGL.vertex3f(11.0f, 1.0f, -1.0f);
		gGL.vertex3f(11.0f, -1.0f, 1.0f);

		gGL.color3f(0.0f, 1.0f, 0.0f);   // j direction = Y-Axis = green
		gGL.vertex3f(0.0f, 0.0f, 0.0f);
		gGL.vertex3f(0.0f, 2.0f, 0.0f);
		gGL.vertex3f(0.0f, 3.0f, 0.0f);
		gGL.vertex3f(0.0f, 5.0f, 0.0f);
		gGL.vertex3f(0.0f, 6.0f, 0.0f);
		gGL.vertex3f(0.0f, 8.0f, 0.0f);
		// Make a Y
		gGL.vertex3f(1.0f, 11.0f, 1.0f);
		gGL.vertex3f(0.0f, 11.0f, 0.0f);
		gGL.vertex3f(-1.0f, 11.0f, 1.0f);
		gGL.vertex3f(0.0f, 11.0f, 0.0f);
		gGL.vertex3f(0.0f, 11.0f, 0.0f);
		gGL.vertex3f(0.0f, 11.0f, -1.0f);

		gGL.color3f(0.0f, 0.0f, 1.0f);   // Z-Axis = blue
		gGL.vertex3f(0.0f, 0.0f, 0.0f);
		gGL.vertex3f(0.0f, 0.0f, 2.0f);
		gGL.vertex3f(0.0f, 0.0f, 3.0f);
		gGL.vertex3f(0.0f, 0.0f, 5.0f);
		gGL.vertex3f(0.0f, 0.0f, 6.0f);
		gGL.vertex3f(0.0f, 0.0f, 8.0f);
		// Make a Z
		gGL.vertex3f(-1.0f, 1.0f, 11.0f);
		gGL.vertex3f(1.0f, 1.0f, 11.0f);
		gGL.vertex3f(1.0f, 1.0f, 11.0f);
		gGL.vertex3f(-1.0f, -1.0f, 11.0f);
		gGL.vertex3f(-1.0f, -1.0f, 11.0f);
		gGL.vertex3f(1.0f, -1.0f, 11.0f);
	gGL.end();
}


void draw_axes() 
{
	LLGLSUIDefault gls_ui;
	gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
	// A vertical white line at origin
	LLVector3 v = gAgent.getPositionAgent();
	gGL.begin(LLRender::LINES);
		gGL.color3f(1.0f, 1.0f, 1.0f); 
		gGL.vertex3f(0.0f, 0.0f, 0.0f);
		gGL.vertex3f(0.0f, 0.0f, 40.0f);
	gGL.end();
	// Some coordinate axes
	glPushMatrix();
		glTranslatef( v.mV[VX], v.mV[VY], v.mV[VZ] );
		renderCoordinateAxes();
	glPopMatrix();
}

void render_ui_3d()
{
	LLGLSPipeline gls_pipeline;

	//////////////////////////////////////
	//
	// Render 3D UI elements
	// NOTE: zbuffer is cleared before we get here by LLDrawPoolHUD,
	//		 so 3d elements requiring Z buffer are moved to LLDrawPoolHUD
	//

	/////////////////////////////////////////////////////////////
	//
	// Render 2.5D elements (2D elements in the world)
	// Stuff without z writes
	//

	// Debugging stuff goes before the UI.

	// Coordinate axes
	if (gSavedSettings.getBOOL("ShowAxes"))
	{
		draw_axes();
	}

	stop_glerror();
		
	gViewerWindow->renderSelections(FALSE, FALSE, TRUE); // Non HUD call in render_hud_elements
	stop_glerror();
}

void render_ui_2d()
{
	LLGLSUIDefault gls_ui;

	/////////////////////////////////////////////////////////////
	//
	// Render 2D UI elements that overlay the world (no z compare)

	//  Disable wireframe mode below here, as this is HUD/menus
	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

	//  Menu overlays, HUD, etc
	gViewerWindow->setup2DRender();

	F32 zoom_factor = LLViewerCamera::getInstance()->getZoomFactor();
	S16 sub_region = LLViewerCamera::getInstance()->getZoomSubRegion();

	if (zoom_factor > 1.f)
	{
		//decompose subregion number to x and y values
		int pos_y = sub_region / llceil(zoom_factor);
		int pos_x = sub_region - (pos_y*llceil(zoom_factor));
		// offset for this tile
		LLFontGL::sCurOrigin.mX -= llround((F32)gViewerWindow->getWindowWidthScaled() * (F32)pos_x / zoom_factor);
		LLFontGL::sCurOrigin.mY -= llround((F32)gViewerWindow->getWindowHeightScaled() * (F32)pos_y / zoom_factor);
	}

	stop_glerror();
	gGL.getTexUnit(0)->setTextureBlendType(LLTexUnit::TB_MULT);

	// render outline for HUD
	if (isAgentAvatarValid() && gAgentCamera.mHUDCurZoom < 0.98f)
	{
		glPushMatrix();
		S32 half_width = (gViewerWindow->getWorldViewWidthScaled() / 2);
		S32 half_height = (gViewerWindow->getWorldViewHeightScaled() / 2);
		glScalef(LLUI::sGLScaleFactor.mV[0], LLUI::sGLScaleFactor.mV[1], 1.f);
		glTranslatef((F32)half_width, (F32)half_height, 0.f);
		F32 zoom = gAgentCamera.mHUDCurZoom;
		glScalef(zoom,zoom,1.f);
		gGL.color4fv(LLColor4::white.mV);
		gl_rect_2d(-half_width, half_height, half_width, -half_height, FALSE);
		glPopMatrix();
		stop_glerror();
	}
	

	if (gSavedSettings.getBOOL("RenderUIBuffer"))
	{
		if (LLUI::sDirty)
		{
			LLUI::sDirty = FALSE;
			LLRect t_rect;

			gPipeline.mUIScreen.bindTarget();
			gGL.setColorMask(true, true);
			{
				static const S32 pad = 8;

				LLUI::sDirtyRect.mLeft -= pad;
				LLUI::sDirtyRect.mRight += pad;
				LLUI::sDirtyRect.mBottom -= pad;
				LLUI::sDirtyRect.mTop += pad;

				LLGLEnable scissor(GL_SCISSOR_TEST);
				static LLRect last_rect = LLUI::sDirtyRect;

				//union with last rect to avoid mouse poop
				last_rect.unionWith(LLUI::sDirtyRect);
								
				t_rect = LLUI::sDirtyRect;
				LLUI::sDirtyRect = last_rect;
				last_rect = t_rect;
			
				last_rect.mLeft = LLRect::tCoordType(last_rect.mLeft / LLUI::sGLScaleFactor.mV[0]);
				last_rect.mRight = LLRect::tCoordType(last_rect.mRight / LLUI::sGLScaleFactor.mV[0]);
				last_rect.mTop = LLRect::tCoordType(last_rect.mTop / LLUI::sGLScaleFactor.mV[1]);
				last_rect.mBottom = LLRect::tCoordType(last_rect.mBottom / LLUI::sGLScaleFactor.mV[1]);

				LLRect clip_rect(last_rect);
				
				glClear(GL_COLOR_BUFFER_BIT);

				gViewerWindow->draw();
			}

			gPipeline.mUIScreen.flush();
			gGL.setColorMask(true, false);

			LLUI::sDirtyRect = t_rect;
			
	}

		LLGLDisable cull(GL_CULL_FACE);
		LLGLDisable blend(GL_BLEND);
		S32 width = gViewerWindow->getWindowWidthScaled();
		S32 height = gViewerWindow->getWindowHeightScaled();
		gGL.getTexUnit(0)->bind(&gPipeline.mUIScreen);
		gGL.begin(LLRender::TRIANGLE_STRIP);
		gGL.color4f(1,1,1,1);
		gGL.texCoord2f(0, 0);			gGL.vertex2i(0, 0);
		gGL.texCoord2f(width, 0);		gGL.vertex2i(width, 0);
		gGL.texCoord2f(0, height);		gGL.vertex2i(0, height);
		gGL.texCoord2f(width, height);	gGL.vertex2i(width, height);
		gGL.end();
	}
	else
	{
		gViewerWindow->draw();
	}



	// reset current origin for font rendering, in case of tiling render
	LLFontGL::sCurOrigin.set(0, 0);
}

void render_disconnected_background()
{
	gGL.color4f(1,1,1,1);
	if (!gDisconnectedImagep && gDisconnected)
	{
		llinfos << "Loading last bitmap..." << llendl;

		std::string temp_str;
		temp_str = gDirUtilp->getLindenUserDir() + gDirUtilp->getDirDelimiter() + SCREEN_LAST_FILENAME;

		LLPointer<LLImageBMP> image_bmp = new LLImageBMP;
		if( !image_bmp->load(temp_str) )
		{
			//llinfos << "Bitmap load failed" << llendl;
			return;
		}
		
		LLPointer<LLImageRaw> raw = new LLImageRaw;
		if (!image_bmp->decode(raw, 0.0f))
		{
			llinfos << "Bitmap decode failed" << llendl;
			gDisconnectedImagep = NULL;
			return;
		}

		U8 *rawp = raw->getData();
		S32 npixels = (S32)image_bmp->getWidth()*(S32)image_bmp->getHeight();
		for (S32 i = 0; i < npixels; i++)
		{
			S32 sum = 0;
			sum = *rawp + *(rawp+1) + *(rawp+2);
			sum /= 3;
			*rawp = ((S32)sum*6 + *rawp)/7;
			rawp++;
			*rawp = ((S32)sum*6 + *rawp)/7;
			rawp++;
			*rawp = ((S32)sum*6 + *rawp)/7;
			rawp++;
		}

		
		raw->expandToPowerOfTwo();
		gDisconnectedImagep = LLViewerTextureManager::getLocalTexture(raw.get(), FALSE );
		gStartTexture = gDisconnectedImagep;
		gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
	}

	// Make sure the progress view always fills the entire window.
	S32 width = gViewerWindow->getWindowWidthScaled();
	S32 height = gViewerWindow->getWindowHeightScaled();

	if (gDisconnectedImagep)
	{
		LLGLSUIDefault gls_ui;
		gViewerWindow->setup2DRender();
		glPushMatrix();
		{
			// scale ui to reflect UIScaleFactor
			// this can't be done in setup2DRender because it requires a
			// pushMatrix/popMatrix pair
			const LLVector2& display_scale = gViewerWindow->getDisplayScale();
			glScalef(display_scale.mV[VX], display_scale.mV[VY], 1.f);

			gGL.getTexUnit(0)->bind(gDisconnectedImagep);
			gGL.color4f(1.f, 1.f, 1.f, 1.f);
			gl_rect_2d_simple_tex(width, height);
			gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
		}
		glPopMatrix();
	}
	gGL.flush();
}

void display_cleanup()
{
	gDisconnectedImagep = NULL;
}