#include "OgreOcclusionCullingSceneManager.h"
#include "OgreVisibilityOptionsManager.h"
#include "OgreTypeConverter.h"
#include <OgreMath.h>
#include <OgreIteratorWrappers.h>
#include <OgreRenderSystem.h>
#include <OgreCamera.h>
#include <OgreLogManager.h>
#include <OgreStringConverter.h>
#include <OgreEntity.h>
#include <OgreSubEntity.h>
#include <OgreIteratorWrappers.h>
#include "VspBspTree.h"
#include "Containers.h"
#include "ViewCellsManager.h"

namespace Ogre {

//-----------------------------------------------------------------------
OcclusionCullingSceneManager::OcclusionCullingSceneManager(
							GtpVisibility::VisibilityManager *visManager): 
mVisibilityManager(visManager), 
mShowVisualization(false),
mRenderNodesForViz(false),
mRenderNodesContentForViz(false),
mVisualizeCulledNodes(false),
mLeavePassesInQueue(0),
mDelayRenderTransparents(true),
mUseDepthPass(false),
mIsDepthPassPhase(false),
mUseItemBuffer(false),
//mUseItemBuffer(true),
mIsItemBufferPhase(false),
mCurrentEntityId(1),
mEnableDepthWrite(true),
mSkipTransparents(false),
mRenderTransparentsForItemBuffer(true),
mExecuteVertexProgramForAllPasses(true),
mIsHierarchicalCulling(false)
{
	mHierarchyInterface = new OctreeHierarchyInterface(this, mDestRenderSystem);
	
#if 0
	mDisplayNodes = true;
	mShowBoundingBoxes = true;
	mShowBoxes = true;
#endif
	// TODO: set maxdepth to reasonable value
	mMaxDepth = 50;
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::InitDepthPass()
{
	MaterialPtr depthMat = MaterialManager::getSingleton().getByName("Visibility/DepthPass");

	if (depthMat.isNull())
    {
		depthMat = MaterialManager::getSingleton().create(
                "Visibility/DepthPass",
                ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);

        mDepthPass = depthMat->getTechnique(0)->getPass(0);
		mDepthPass->setColourWriteEnabled(false);
		mDepthPass->setDepthWriteEnabled(true);
		mDepthPass->setLightingEnabled(false);
	}
	else
	{
		mDepthPass = depthMat->getTechnique(0)->getPass(0);
	}
}
//-----------------------------------------------------------------------
OcclusionCullingSceneManager::~OcclusionCullingSceneManager()
{
	OGRE_DELETE(mHierarchyInterface);
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::InitItemBufferPass()
{
	MaterialPtr itemBufferMat = MaterialManager::getSingleton().
		getByName("Visibility/ItemBufferPass");

	if (itemBufferMat.isNull())
    {
		// Init
		itemBufferMat = MaterialManager::getSingleton().create("Visibility/ItemBufferPass",
                ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);

		mItemBufferPass = itemBufferMat->getTechnique(0)->getPass(0);
		mItemBufferPass->setColourWriteEnabled(true);
		mItemBufferPass->setDepthWriteEnabled(true);
		mItemBufferPass->setLightingEnabled(true);
		//mItemBufferPass->setLightingEnabled(false);
	}
	else
	{
		mItemBufferPass = itemBufferMat->getTechnique(0)->getPass(0);
	}
	//mItemBufferPass->setAmbient(1, 1, 0);
}
//-------------------------------------------------------------------------
void OcclusionCullingSceneManager::setWorldGeometry( const String& filename )
{
    // Clear out any existing world resources (if not default)
    if (ResourceGroupManager::getSingleton().getWorldResourceGroupName() != 
        ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME)
    {
        ResourceGroupManager::getSingleton().clearResourceGroup(
            ResourceGroupManager::getSingleton().getWorldResourceGroupName());
    }
    mTerrainPages.clear();
    // Load the configuration
    loadConfig(filename);

    // Resize the octree, allow for 1 page for now
    float max_x = mOptions.scale.x * mOptions.pageSize;
    float max_y = mOptions.scale.y;
    float max_z = mOptions.scale.z * mOptions.pageSize;

	float maxAxis = std::max(max_x, max_y);
	maxAxis = std::max(maxAxis, max_z);
	resize( AxisAlignedBox( 0, 0, 0, maxAxis, maxAxis, maxAxis ) );
    
    setupTerrainMaterial();

    setupTerrainPages();

 }

//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::PrepareVisualization(Camera *cam)
{
	// add player camera for visualization purpose
	try 
	{
		Camera *c;
		if ((c = getCamera("PlayerCam")) != NULL)
		{
			getRenderQueue()->addRenderable(c);
		}   
    }
    catch (...)
    {
        // ignore
    }
	for (BoxList::iterator it = mBoxes.begin(); it != mBoxes.end(); ++it)
	{
		getRenderQueue()->addRenderable(*it);
	}
	if (mRenderNodesForViz || mRenderNodesContentForViz)
	{
		// HACK: change node material so it is better suited for visualization
		MaterialPtr nodeMat = MaterialManager::getSingleton().getByName("Core/NodeMaterial");
		nodeMat->setAmbient(1, 1, 0);
		nodeMat->setLightingEnabled(true);
		nodeMat->getTechnique(0)->getPass(0)->removeAllTextureUnitStates();

		for (NodeList::iterator it = mVisible.begin(); it != mVisible.end(); ++it)
		{
			if (mRenderNodesForViz)
			{
				// render the leaf nodes
				if (((*it)->numAttachedObjects() > 0) && ((*it)->numChildren() == 0) && 
					 (*it)->getAttachedObject(0)->getMovableType() == "Entity")
				{
					getRenderQueue()->addRenderable((*it));
				}

				// addbounding boxes instead of node itself
				//(*it)->_addBoundingBoxToQueue(getRenderQueue());
			}
			if (mRenderNodesContentForViz) 
			{
				(*it)->_addToRenderQueue(cam, getRenderQueue(), false);
			}
		}
	}	
}
//-----------------------------------------------------------------------
Pass *OcclusionCullingSceneManager::setPass(Pass* pass)
{
	// TODO: setting vertex program is not efficient
	//Pass *usedPass = ((mIsDepthPassPhase && !pass->hasVertexProgram()) ? mDepthPass : pass); 
	
	// set depth fill pass if we currently do not make an aabb occlusion query
	Pass *usedPass = (mIsDepthPassPhase && !mHierarchyInterface->IsBoundingBoxQuery() ? 
					  mDepthPass : pass);
		
	IlluminationRenderStage savedStage = mIlluminationStage; 
	
	// set illumination stage to NONE so no shadow material is used 
	// for depth pass or for occlusion query
	if (mIsDepthPassPhase || mHierarchyInterface->IsBoundingBoxQuery())
	{
		mIlluminationStage = IRS_NONE;
	}
	
	// --- set vertex program of current pass in order to set correct depth
	if (mExecuteVertexProgramForAllPasses && mIsDepthPassPhase && pass->hasVertexProgram())
	{
		// add vertex program of current pass to depth pass
		mDepthPass->setVertexProgram(pass->getVertexProgramName());

		if (mDepthPass->hasVertexProgram())
		{
			const GpuProgramPtr& prg = mDepthPass->getVertexProgram();
			// Load this program if not done already
			if (!prg->isLoaded())
				prg->load();
			// Copy params
			mDepthPass->setVertexProgramParameters(pass->getVertexProgramParameters());
		}
	}
	else if (mDepthPass->hasVertexProgram())
	{
		mDepthPass->setVertexProgram("");
	}
	

	bool IsDepthWrite = usedPass->getDepthWriteEnabled();

	// global option which enables / disables depth writes
	if (!mEnableDepthWrite)
	{
		usedPass->setDepthWriteEnabled(false);
	}
	//else if (mIsItemBufferPass) {usedPass = mItemBufferPass;}
	
	Pass *result = SceneManager::setPass(usedPass);

	// reset depth write
	if (!mEnableDepthWrite)
	{
		usedPass->setDepthWriteEnabled(IsDepthWrite);
	}

	// reset illumination stage
	mIlluminationStage = savedStage;

	return result;
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::_findVisibleObjects(Camera* cam,
														bool onlyShadowCasters)
{
	//-- show visible scene nodes and octree bounding boxes from last frame
	if (mShowVisualization)
    {
		PrepareVisualization(cam);
	}
	else 
	{	
		// for hierarchical culling, we interleave identification 
		// and rendering of objects in _renderVisibibleObjects

		// for the shadow pass we use only standard rendering
		// because of low occlusion
		if (mShadowTechnique == SHADOWTYPE_TEXTURE_MODULATIVE && 
			mIlluminationStage == IRS_RENDER_TO_TEXTURE)
		{
			TerrainSceneManager::_findVisibleObjects(cam, onlyShadowCasters);
		}
		// only shadow casters will be rendered in shadow texture pass
		// mHierarchyInterface->SetOnlyShadowCasters(onlyShadowCasters);
	}
	
	
	// -- delete lists stored for visualization
	mVisible.clear();
	mBoxes.clear();
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::_renderVisibleObjects()
{

	InitDepthPass(); 	  // create material for depth pass
	InitItemBufferPass(); // create material for item buffer pass

	// save ambient light to reset later
	ColourValue savedAmbient = mAmbientLight;

	//-- apply standard rendering for some modes (e.g., visualization, shadow pass)

	if (mShowVisualization ||
	   (mShadowTechnique == SHADOWTYPE_TEXTURE_MODULATIVE && 
	    mIlluminationStage == IRS_RENDER_TO_TEXTURE))
	{	
		IlluminationRenderStage savedStage = mIlluminationStage; 
	
		if (mShowVisualization) 
			// disable illumination stage to prevent rendering shadows
			mIlluminationStage = IRS_NONE;

		// standard rendering for shadow maps because of performance
		TerrainSceneManager::_renderVisibleObjects();

		mIlluminationStage = savedStage;
	}
	else //-- the hierarchical culling algorithm
	{
		// don't render backgrounds for item buffer
		if (mUseItemBuffer)
		{
			clearSpecialCaseRenderQueues();
			getRenderQueue()->clear();
		}

		//-- hierarchical culling
		// the objects of different layers (e.g., background, scene, 
		// overlay) must be identified and rendered one after another

		//-- render all early skies
		clearSpecialCaseRenderQueues();
		addSpecialCaseRenderQueue(RENDER_QUEUE_BACKGROUND);
		addSpecialCaseRenderQueue(RENDER_QUEUE_SKIES_EARLY);
		setSpecialCaseRenderQueueMode(SceneManager::SCRQM_INCLUDE);

		TerrainSceneManager::_renderVisibleObjects();

#ifdef GTP_VISIBILITY_MODIFIED_OGRE
		// delete previously rendered content
		_deleteRenderedQueueGroups();
#endif

		//-- prepare queue for visible objects (i.e., all but overlay and skies late)
		clearSpecialCaseRenderQueues();
		addSpecialCaseRenderQueue(RENDER_QUEUE_SKIES_LATE);
		addSpecialCaseRenderQueue(RENDER_QUEUE_OVERLAY);
	
		// exclude this queues from hierarchical rendering
		setSpecialCaseRenderQueueMode(SceneManager::SCRQM_EXCLUDE);

		// set all necessary parameters for 
		// hierarchical visibility culling and rendering
		InitVisibilityCulling(mCameraInProgress);

	
		/** 
		* the hierarchical culling algorithm
		* for depth pass: we just find objects and update depth buffer
		* for "delayed" rendering: we render some passes afterwards
		* e.g., transparents, because they need front-to-back sorting
		**/
		
		mVisibilityManager->ApplyVisibilityCulling();

		// delete remaining renderables from queue (all not in mLeavePassesInQueue)
#ifdef GTP_VISIBILITY_MODIFIED_OGRE
		_deleteRenderedQueueGroups(mLeavePassesInQueue);
#endif

		//-- reset parameters
		mIsDepthPassPhase = false;
		mIsItemBufferPhase = false;
		mSkipTransparents = false;
		mLeavePassesInQueue = 0;
		

		// add visible nodes found by the visibility culling algorithm
		if (mUseDepthPass)
		{
			for (NodeList::iterator it = mVisible.begin(); it != mVisible.end(); ++ it)
			{
				(*it)->_addToRenderQueue(mCameraInProgress, getRenderQueue(), false);
			}
		}
		
		//-- now we can render all remaining queue objects
		// used for depth pass, transparents, overlay 
		clearSpecialCaseRenderQueues();

		TerrainSceneManager::_renderVisibleObjects();
	}
		
	// HACK: set the new render level index, important to avoid cracks
	// in terrain caused by LOD
	TerrainRenderable::NextRenderLevelIndex();
	
	// reset ambient light
	setAmbientLight(savedAmbient);

	getRenderQueue()->clear(); // finally clear render queue
	OGRE_DELETE(mRenderQueue); // HACK: should be cleared before ...
	WriteLog(); // write out stats

}

//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::_updateSceneGraph(Camera* cam)
{
	mVisibilityManager->GetCullingManager()->SetHierarchyInterface(mHierarchyInterface);
	mHierarchyInterface->SetRenderSystem(mDestRenderSystem);

	TerrainSceneManager::_updateSceneGraph(cam);
}
//-----------------------------------------------------------------------
bool OcclusionCullingSceneManager::setOption(const String & key, const void * val)
{
	if (key == "UseDepthPass")
	{
		mUseDepthPass = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "PrepareVisualization")
	{
		mShowVisualization = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "RenderNodesForViz")
	{
		mRenderNodesForViz = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "RenderNodesContentForViz")
	{
		mRenderNodesContentForViz = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "SkyBoxEnabled")
	{
		mSkyBoxEnabled = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "SkyPlaneEnabled")
	{
		mSkyPlaneEnabled = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "SkyDomeEnabled")
	{
		mSkyDomeEnabled = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "VisualizeCulledNodes")
	{
		mVisualizeCulledNodes = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "DelayRenderTransparents")
	{
		mDelayRenderTransparents = (*static_cast<const bool *>(val));
		return true;
	}

	if (key == "DepthWrite")
	{
		mEnableDepthWrite = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "UseItemBuffer")
	{
		mUseItemBuffer = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "ExecuteVertexProgramForAllPasses")
	{ 
		mExecuteVertexProgramForAllPasses  = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "RenderTransparentsForItemBuffer")
	{ 
		mRenderTransparentsForItemBuffer  = (*static_cast<const bool *>(val));
		return true;
	}
	if (key == "NodeVizScale")
	{ 
		OctreeNode::setVizScale(*static_cast<const float *>(val));
		return true;
	}

	if (key == "UseArbQueries")
	{
		bool useArbQueries = (*static_cast<const bool *>(val));

		if (useArbQueries)
		{
			mHierarchyInterface->DeleteQueries();
			mDestRenderSystem->setConfigOption("ArbQueries", "Yes");
		}
		else
		{
			mHierarchyInterface->DeleteQueries();
			mDestRenderSystem->setConfigOption("ArbQueries", "No");
		}
	}
	return VisibilityOptionsManager(mVisibilityManager, mHierarchyInterface).
		setOption(key, val) || TerrainSceneManager::setOption(key, val);
}
//-----------------------------------------------------------------------
bool OcclusionCullingSceneManager::getOption(const String & key, void *val)
{
	if (key == "NumHierarchyNodes")
	{
		* static_cast<unsigned int *>(val) = (unsigned int)mNumOctants;
		return true;
	}
	
	return VisibilityOptionsManager(mVisibilityManager, mHierarchyInterface).
		getOption(key, val) && TerrainSceneManager::getOption(key, val);
}
//-----------------------------------------------------------------------
bool OcclusionCullingSceneManager::getOptionValues(const String & key, 
													StringVector &refValueList)
{
	return TerrainSceneManager::getOptionValues( key, refValueList);
}
//-----------------------------------------------------------------------
bool OcclusionCullingSceneManager::getOptionKeys(StringVector & refKeys)
{
	return VisibilityOptionsManager(mVisibilityManager, mHierarchyInterface).
		getOptionKeys(refKeys) || TerrainSceneManager::getOptionKeys(refKeys);
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::setVisibilityManager(GtpVisibility::
														 VisibilityManager *visManager)
{
	mVisibilityManager = visManager;
}
//-----------------------------------------------------------------------
GtpVisibility::VisibilityManager *OcclusionCullingSceneManager::getVisibilityManager( void )
{
	return mVisibilityManager;
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::WriteLog()
{
	std::stringstream d;

	d << "Depth pass: " << StringConverter::toString(mUseDepthPass) << ", "
	  << "Delay transparents: " << StringConverter::toString(mDelayRenderTransparents) << ", "
	  << "Use optimization: " << StringConverter::toString(mHierarchyInterface->GetTestGeometryForVisibleLeaves()) << ", "
	  << "Algorithm type: " << mVisibilityManager->GetCullingManagerType() << ", "
	  << "Hierarchy nodes: " << mNumOctants << ", " 
	  << "Traversed nodes: " << mHierarchyInterface->GetNumTraversedNodes() << ", "
	  << "Rendered nodes: " << mHierarchyInterface->GetNumRenderedNodes() << ", "
	  << "Query culled nodes: " << mVisibilityManager->GetCullingManager()->GetNumQueryCulledNodes() << ", "
	  << "Frustum culled nodes: " << mVisibilityManager->GetCullingManager()->GetNumFrustumCulledNodes() << ", "
      << "Queries issued: " << mVisibilityManager->GetCullingManager()->GetNumQueriesIssued() << "\n";

	LogManager::getSingleton().logMessage(d.str());
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::renderObjects(
	const RenderPriorityGroup::TransparentRenderablePassList& objs, 
    bool doLightIteration, const LightList* manualLightList)
{
	// for correct rendering, transparents must be rendered after hierarchical culling
	if (!mSkipTransparents)
	{
		OctreeSceneManager::renderObjects(objs, doLightIteration, manualLightList);
	}
}
//-----------------------------------------------------------------------
bool OcclusionCullingSceneManager::validatePassForRendering(Pass* pass)
{
	// skip all but first pass if we are doing the depth pass
	if ((mIsDepthPassPhase || mIsItemBufferPhase) && pass->getIndex() > 0)
	{
		return false;
	}

	return SceneManager::validatePassForRendering(pass);
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::renderQueueGroupObjects(RenderQueueGroup* pGroup)
{
	if (!mIsItemBufferPhase)
	{
		TerrainSceneManager::renderQueueGroupObjects(pGroup);
		return;
	}

	//-- item buffer

    // Iterate through priorities
    RenderQueueGroup::PriorityMapIterator groupIt = pGroup->getIterator();

	while (groupIt.hasMoreElements())
    {
		RenderItemBuffer(groupIt.getNext());
	}
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::RenderItemBuffer(RenderPriorityGroup* pGroup)
{
	// Do solids
	RenderPriorityGroup::SolidRenderablePassMap solidObjs = pGroup->_getSolidPasses();

	// ----- SOLIDS LOOP -----
	RenderPriorityGroup::SolidRenderablePassMap::const_iterator ipass, ipassend;
	ipassend = solidObjs.end();

	for (ipass = solidObjs.begin(); ipass != ipassend; ++ipass)
	{
		// Fast bypass if this group is now empty
		if (ipass->second->empty()) 
			continue;

		// Render only first pass
		if (ipass->first->getIndex() > 0)
			continue;

		RenderPriorityGroup::RenderableList* rendList = ipass->second;
		
		RenderPriorityGroup::RenderableList::const_iterator irend, irendend;
		irendend = rendList->end();
			
		for (irend = rendList->begin(); irend != irendend; ++irend)
		{
			//std::stringstream d; d << "itembuffer, pass name: " << 
			//	ipass->first->getParent()->getParent()->getName();
			//	LogManager::getSingleton().logMessage(d.str());
			
			RenderSingleObjectForItemBuffer(*irend, ipass->first);
		}
	}

	// -- TRANSPARENT LOOP: must be handled differently 

	// transparents are treated either as solids or completely discarded
	if (mRenderTransparentsForItemBuffer)
	{
		RenderPriorityGroup::TransparentRenderablePassList transpObjs = 
			pGroup->_getTransparentPasses();
		RenderPriorityGroup::TransparentRenderablePassList::const_iterator 
			itrans, itransend;

		itransend = transpObjs.end();
		for (itrans = transpObjs.begin(); itrans != itransend; ++itrans)
		{
			// like for solids, render only first pass
			if (itrans->pass->getIndex() == 0)
			{	
				RenderSingleObjectForItemBuffer(itrans->renderable, itrans->pass);
			}
		}
	}
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::RenderSingleObjectForItemBuffer(Renderable *rend, Pass *pass)
{
	static LightList nullLightList;
	
	int col[4];
	
	// -- create color code out of object id
	col[0] = (rend->getId() >> 16) & 255;
	col[1] = (rend->getId() >> 8) & 255;
	col[2] = rend->getId() & 255;
//	col[3] = 255;

	//mDestRenderSystem->setColour(col[0], col[1], col[2], col[3]);
    
	mItemBufferPass->setAmbient(ColourValue(col[0] / 255.0f,
										    col[1] / 255.0f, 
											col[2] / 255.0f, 1));

	// set vertex program of current pass
	if (mExecuteVertexProgramForAllPasses && pass->hasVertexProgram())
	{
		mItemBufferPass->setVertexProgram(pass->getVertexProgramName());

		if (mItemBufferPass->hasVertexProgram())
		{
			const GpuProgramPtr& prg = mItemBufferPass->getVertexProgram();
			// Load this program if not done already
			if (!prg->isLoaded())
				prg->load();
			// Copy params
			mItemBufferPass->setVertexProgramParameters(pass->getVertexProgramParameters());
		}
	}
	else if (mItemBufferPass->hasVertexProgram())
	{
		mItemBufferPass->setVertexProgram("");
	}

	Pass *usedPass = setPass(mItemBufferPass); 


	// Render a single object, this will set up auto params if required
	renderSingleObject(rend, usedPass, false, &nullLightList);
}
//-----------------------------------------------------------------------
GtpVisibility::VisibilityManager *OcclusionCullingSceneManager::GetVisibilityManager()
{
	return mVisibilityManager;
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::InitVisibilityCulling(Camera *cam)
{
	// reset culling manager stats
	mVisibilityManager->GetCullingManager()->InitFrame(mVisualizeCulledNodes);

	// set depth pass flag before rendering
	mIsDepthPassPhase = mUseDepthPass;

	// item buffer needs full ambient lighting to use item colors as unique id
	if (mUseItemBuffer) 
	{
		mIsItemBufferPhase = true;
		setAmbientLight(ColourValue(1,1,1,1));
	}


	// set passes which are stored in render queue 
	// for rendering AFTER hierarchical culling, i.e., passes which need 
	// a special rendering order
	mLeavePassesInQueue = 0;

	// if we have the depth pass or use an item buffer, no passes are left in the queue
	if (0 && !mUseDepthPass && !mUseItemBuffer)
	{
		if (mShadowTechnique == SHADOWTYPE_STENCIL_ADDITIVE)
		{
			// TODO: remove this pass because it should be processed during hierarchical culling
			//mLeavePassesInQueue |= RenderPriorityGroup::SOLID_PASSES_NOSHADOW;

			mLeavePassesInQueue |= RenderPriorityGroup::SOLID_PASSES_DECAL;
			mLeavePassesInQueue |= RenderPriorityGroup::SOLID_PASSES_DIFFUSE_SPECULAR;
			mLeavePassesInQueue |= RenderPriorityGroup::TRANSPARENT_PASSES;

			// just render ambient stuff
			mIlluminationStage = IRS_AMBIENT;
		}
	
		if (mShadowTechnique == SHADOWTYPE_STENCIL_MODULATIVE)
		{
			mLeavePassesInQueue |= RenderPriorityGroup::SOLID_PASSES_NOSHADOW;
			mLeavePassesInQueue |= RenderPriorityGroup::TRANSPARENT_PASSES;
		}
	
		// transparents should be rendered after hierarchical culling to 
		// provide front-to-back ordering
		if (mDelayRenderTransparents)
		{
			mLeavePassesInQueue |= RenderPriorityGroup::TRANSPARENT_PASSES;
		}
	}

	// skip rendering transparents in the hierarchical culling
	// (because they will be rendered afterwards)
	mSkipTransparents = mUseDepthPass || 
		(mLeavePassesInQueue & RenderPriorityGroup::TRANSPARENT_PASSES);

	// -- initialise interface for rendering traversal of the hierarchy
	mHierarchyInterface->SetHierarchyRoot(mOctree);
	
	// possible two cameras (one for culling, one for rendering)
	mHierarchyInterface->InitTraversal(mCameraInProgress, 
									   mCullCamera ? getCamera("CullCamera") : NULL,
									   mLeavePassesInQueue);
		
}
//-----------------------------------------------------------------------
OctreeHierarchyInterface *OcclusionCullingSceneManager::GetHierarchyInterface()
{
	return mHierarchyInterface;
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::endFrame()
{
	TerrainRenderable::ResetRenderLevelIndex();
}
//-----------------------------------------------------------------------
Entity* OcclusionCullingSceneManager::createEntity(const String& entityName, 
													const String& meshName)
{
	Entity *ent = SceneManager::createEntity(entityName, meshName);

	for (int i = 0; i < (int)ent->getNumSubEntities(); ++i)
	{
		ent->getSubEntity(i)->setId(mCurrentEntityId);
	}

	// increase counter of entity id values
	++ mCurrentEntityId;

	return ent;
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::renderAdditiveStencilShadowedQueueGroupObjects(RenderQueueGroup* pGroup)
{
	// only render solid passes during hierarchical culling
	if (mIsHierarchicalCulling)
	{
		RenderQueueGroup::PriorityMapIterator groupIt = pGroup->getIterator();
	    LightList lightList;

		while (groupIt.hasMoreElements())
		{
			RenderPriorityGroup* pPriorityGrp = groupIt.getNext();

			// Sort the queue first
			pPriorityGrp->sort(mCameraInProgress);

			// Clear light list
			lightList.clear();

			// Render all the ambient passes first, no light iteration, no lights
			mIlluminationStage = IRS_AMBIENT;

			OctreeSceneManager::renderObjects(pPriorityGrp->_getSolidPasses(), false, &lightList);
			// Also render any objects which have receive shadows disabled
			OctreeSceneManager::renderObjects(pPriorityGrp->_getSolidPassesNoShadow(), true);
		}
	}
	else
	{
		OctreeSceneManager::renderAdditiveStencilShadowedQueueGroupObjects(pGroup);
	}
}
//-----------------------------------------------------------------------
void OcclusionCullingSceneManager::renderModulativeStencilShadowedQueueGroupObjects(RenderQueueGroup* pGroup)
{
   if (mIsHierarchicalCulling)
   {
	   // Iterate through priorities
	   RenderQueueGroup::PriorityMapIterator groupIt = pGroup->getIterator();

	   while (groupIt.hasMoreElements())
	   {
		   RenderPriorityGroup* pPriorityGrp = groupIt.getNext();

		   // Sort the queue first
		   pPriorityGrp->sort(mCameraInProgress);

		   // Do (shadowable) solids
		   OctreeSceneManager::renderObjects(pPriorityGrp->_getSolidPasses(), true);
	   }
   }
   else
   {
	   SceneManager::renderModulativeStencilShadowedQueueGroupObjects(pGroup);
   }
}


MovableObject *OcclusionCullingSceneManager::FindCorrespondingObject(const AxisAlignedBox &box)
{
	list<SceneNode *> sceneNodeList;

	findNodesIn(box, sceneNodeList, NULL);

	list<SceneNode *>::const_iterator sit, sit_end = sceneNodeList.end();

	bool overlap = false;

	MovableObject *bestFittingObj = NULL;
	float bestFit = 0.0;
	
	// find the bbox which is closest to the current bbox
	for (sit = sceneNodeList.begin(); sit != sceneNodeList.end(), !overlap; ++ sit)
	{
		SceneNode *sn = *sit;
		SceneNode::ObjectIterator oit = sn->getAttachedObjectIterator();

        while (oit.hasMoreElements())
		{
			 MovableObject *mo = oit.getNext();
			 const AxisAlignedBox bbox = mo->getWorldBoundingBox();
			 
			 const float overlap = GtpVisibilityPreprocessor::FactorOfOverlap(
				 OgreTypeConverter::ConvertFromOgre(bbox), 
				 OgreTypeConverter::ConvertFromOgre(box));

			 if (overlap > bestFit)
			 {
				 bestFit = overlap;
				 bestFittingObj = mo;

				 // perfect fit => object found
				 if (overlap > (1.0 - GtpVisibilityPreprocessor::Limits::Small))
					break;
			 }
		}
	}

	return bestFittingObj;
}


void OcclusionCullingSceneManager::LoadViewCells(string filename)
{
	GtpVisibilityPreprocessor::ObjectContainer objects;
	// identify the corresponding Ogre meshes using the bounding boxes
	IdentifyObjects(objects);

	// load the view cells assigning the found objects to the pvss
	mViewCellsManager->LoadViewCells(filename, &objects);
}


void OcclusionCullingSceneManager::IdentifyObjects(GtpVisibilityPreprocessor::ObjectContainer &objects)
{
	const string bboxesFilename = "boxes.out";

	GtpVisibilityPreprocessor::IndexedBoundingBoxContainer iboxes;
	mViewCellsManager->LoadBoundingBoxes(bboxesFilename, iboxes);

	GtpVisibilityPreprocessor::IndexedBoundingBoxContainer::
		const_iterator iit, iit_end = iboxes.end();

	for (iit = iboxes.begin(); iit != iit_end; ++ iit)
	{
		  const GtpVisibilityPreprocessor::AxisAlignedBox3 box = (*iit).second;
		  const AxisAlignedBox currentBox = OgreTypeConverter::ConvertToOgre(box);
		  
		  MovableObject *mo = FindCorrespondingObject(currentBox);

		  //objects.push_back(mi);
	}
}

} // namespace Ogre