/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

This program 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; either version 2 of the License, or (at your option) any later
version.

This program 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 program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/
#include "OgreStableHeaders.h"
#include "OgreStaticGeometry.h"
#include "OgreEntity.h"
#include "OgreSubEntity.h"
#include "OgreSceneNode.h"
#include "OgreException.h"
#include "OgreMesh.h"
#include "OgreSubMesh.h"
#include "OgreLogManager.h"
#include "OgreSceneManager.h"
#include "OgreCamera.h"
#include "OgreMaterialManager.h"
#include "OgreRoot.h"
#include "OgreRenderSystem.h"
#include "OgreEdgeListBuilder.h"

namespace Ogre {

	#define REGION_RANGE 1024
	#define REGION_HALF_RANGE 512
	#define REGION_MAX_INDEX 511
	#define REGION_MIN_INDEX -512

	//--------------------------------------------------------------------------
	StaticGeometry::StaticGeometry(SceneManager* owner, const String& name):
		mOwner(owner),
		mName(name),
		mBuilt(false),
		mUpperDistance(0.0f),
		mSquaredUpperDistance(0.0f),
		mCastShadows(false),
		mRegionDimensions(Vector3(1000,1000,1000)),
		mHalfRegionDimensions(Vector3(500,500,500)),
		mOrigin(Vector3(0,0,0)),
		mVisible(true),
        mRenderQueueID(RENDER_QUEUE_MAIN),
        mRenderQueueIDSet(false)
	{
	}
	//--------------------------------------------------------------------------
	StaticGeometry::~StaticGeometry()
	{
		reset();
	}
	//--------------------------------------------------------------------------
	StaticGeometry::Region* StaticGeometry::getRegion(const AxisAlignedBox& bounds,
		bool autoCreate)
	{
		if (bounds.isNull())
			return 0;

		// Get the region which has the largest overlapping volume
		const Vector3 min = bounds.getMinimum();
		const Vector3 max = bounds.getMaximum();

		// Get the min and max region indexes
		ushort minx, miny, minz;
		ushort maxx, maxy, maxz;
		getRegionIndexes(min, minx, miny, minz);
		getRegionIndexes(max, maxx, maxy, maxz);
		Real maxVolume = 0.0f;
		ushort finalx, finaly, finalz;
		for (ushort x = minx; x <= maxx; ++x)
		{
			for (ushort y = miny; y <= maxy; ++y)
			{
				for (ushort z = minz; z <= maxz; ++z)
				{
					Real vol = getVolumeIntersection(bounds, x, y, z);
					if (vol > maxVolume)
					{
						maxVolume = vol;
						finalx = x;
						finaly = y;
						finalz = z;
					}

				}
			}
		}

		assert(maxVolume > 0.0f &&
			"Static geometry: Problem determining closest volume match!");

		return getRegion(finalx, finaly, finalz, autoCreate);

	}
	//--------------------------------------------------------------------------
	Real StaticGeometry::getVolumeIntersection(const AxisAlignedBox& box,
		ushort x, ushort y, ushort z)
	{
		// Get bounds of indexed region
		AxisAlignedBox regionBounds = getRegionBounds(x, y, z);
		AxisAlignedBox intersectBox = regionBounds.intersection(box);
		// return a 'volume' which ignores zero dimensions
		// since we only use this for relative comparisons of the same bounds
		// this will still be internally consistent
		Vector3 boxdiff = box.getMaximum() - box.getMinimum();
		Vector3 intersectDiff = intersectBox.getMaximum() - intersectBox.getMinimum();

		return (boxdiff.x == 0 ? 1 : intersectDiff.x) *
			(boxdiff.y == 0 ? 1 : intersectDiff.y) *
			(boxdiff.z == 0 ? 1 : intersectDiff.z);

	}
	//--------------------------------------------------------------------------
	AxisAlignedBox StaticGeometry::getRegionBounds(ushort x, ushort y, ushort z)
	{
		Vector3 min(
			((Real)x - REGION_HALF_RANGE) * mRegionDimensions.x + mOrigin.x,
			((Real)y - REGION_HALF_RANGE) * mRegionDimensions.y + mOrigin.y,
			((Real)z - REGION_HALF_RANGE) * mRegionDimensions.z + mOrigin.z
			);
		Vector3 max = min + mRegionDimensions;
		return AxisAlignedBox(min, max);
	}
	//--------------------------------------------------------------------------
 	Vector3 StaticGeometry::getRegionCentre(ushort x, ushort y, ushort z)
	{
		return Vector3(
			((Real)x - REGION_HALF_RANGE) * mRegionDimensions.x + mOrigin.x
				+ mHalfRegionDimensions.x,
			((Real)y - REGION_HALF_RANGE) * mRegionDimensions.y + mOrigin.y
				+ mHalfRegionDimensions.y,
			((Real)z - REGION_HALF_RANGE) * mRegionDimensions.z + mOrigin.z
				+ mHalfRegionDimensions.z
			);
	}
	//--------------------------------------------------------------------------
	StaticGeometry::Region* StaticGeometry::getRegion(
			ushort x, ushort y, ushort z, bool autoCreate)
	{
		uint32 index = packIndex(x, y, z);
		Region* ret = getRegion(index);
		if (!ret && autoCreate)
		{
			// Make a name
			StringUtil::StrStreamType str;
			str << mName << ":" << index;
			// Calculate the region centre
			Vector3 centre = getRegionCentre(x, y, z);
			ret = OGRE_NEW Region(this, str.str(), mOwner, index, centre);
			mOwner->injectMovableObject(ret);
			ret->setVisible(mVisible);
			ret->setCastShadows(mCastShadows);
			if (mRenderQueueIDSet)
			{
				ret->setRenderQueueGroup(mRenderQueueID);
			}
			mRegionMap[index] = ret;
		}
		return ret;
	}
	//--------------------------------------------------------------------------
	StaticGeometry::Region* StaticGeometry::getRegion(uint32 index)
	{
		RegionMap::iterator i = mRegionMap.find(index);
		if (i != mRegionMap.end())
		{
			return i->second;
		}
		else
		{
			return 0;
		}

	}
	//--------------------------------------------------------------------------
	void StaticGeometry::getRegionIndexes(const Vector3& point,
		ushort& x, ushort& y, ushort& z)
	{
		// Scale the point into multiples of region and adjust for origin
		Vector3 scaledPoint = (point - mOrigin) / mRegionDimensions;

		// Round down to 'bottom left' point which represents the cell index
		int ix = Math::IFloor(scaledPoint.x);
		int iy = Math::IFloor(scaledPoint.y);
		int iz = Math::IFloor(scaledPoint.z);

		// Check bounds
		if (ix < REGION_MIN_INDEX || ix > REGION_MAX_INDEX
			|| iy < REGION_MIN_INDEX || iy > REGION_MAX_INDEX
			|| iz < REGION_MIN_INDEX || iz > REGION_MAX_INDEX)
		{
			OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
				"Point out of bounds",
				"StaticGeometry::getRegionIndexes");
		}
		// Adjust for the fact that we use unsigned values for simplicity
		// (requires less faffing about for negatives give 10-bit packing
		x = static_cast<ushort>(ix + REGION_HALF_RANGE);
		y = static_cast<ushort>(iy + REGION_HALF_RANGE);
		z = static_cast<ushort>(iz + REGION_HALF_RANGE);


	}
	//--------------------------------------------------------------------------
	uint32 StaticGeometry::packIndex(ushort x, ushort y, ushort z)
	{
		return x + (y << 10) + (z << 20);
	}
	//--------------------------------------------------------------------------
	StaticGeometry::Region* StaticGeometry::getRegion(const Vector3& point,
		bool autoCreate)
	{
		ushort x, y, z;
		getRegionIndexes(point, x, y, z);
		return getRegion(x, y, z, autoCreate);
	}
	//--------------------------------------------------------------------------
	AxisAlignedBox StaticGeometry::calculateBounds(VertexData* vertexData,
		const Vector3& position, const Quaternion& orientation,
		const Vector3& scale)
	{
		const VertexElement* posElem =
			vertexData->vertexDeclaration->findElementBySemantic(
				VES_POSITION);
		HardwareVertexBufferSharedPtr vbuf =
			vertexData->vertexBufferBinding->getBuffer(posElem->getSource());
		unsigned char* vertex =
			static_cast<unsigned char*>(
				vbuf->lock(HardwareBuffer::HBL_READ_ONLY));
		float* pFloat;

		Vector3 min, max;
		bool first = true;

		for(size_t j = 0; j < vertexData->vertexCount; ++j, vertex += vbuf->getVertexSize())
		{
			posElem->baseVertexPointerToElement(vertex, &pFloat);

			Vector3 pt;

			pt.x = (*pFloat++);
			pt.y = (*pFloat++);
			pt.z = (*pFloat++);
			// Transform to world (scale, rotate, translate)
			pt = (orientation * (pt * scale)) + position;
			if (first)
			{
				min = max = pt;
				first = false;
			}
			else
			{
				min.makeFloor(pt);
				max.makeCeil(pt);
			}

		}
		vbuf->unlock();
		return AxisAlignedBox(min, max);
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::addEntity(Entity* ent, const Vector3& position,
		const Quaternion& orientation, const Vector3& scale)
	{
		const MeshPtr& msh = ent->getMesh();
		// Validate
		if (msh->isLodManual())
		{
			LogManager::getSingleton().logMessage(
				"WARNING (StaticGeometry): Manual LOD is not supported. "
				"Using only highest LOD level for mesh " + msh->getName());
		}

		AxisAlignedBox sharedWorldBounds;
		// queue this entities submeshes and choice of material
		// also build the lists of geometry to be used for the source of lods
		for (uint i = 0; i < ent->getNumSubEntities(); ++i)
		{
			SubEntity* se = ent->getSubEntity(i);
			QueuedSubMesh* q = OGRE_NEW QueuedSubMesh();

			// Get the geometry for this SubMesh
			q->submesh = se->getSubMesh();
			q->geometryLodList = determineGeometry(q->submesh);
			q->materialName = se->getMaterialName();
			q->orientation = orientation;
			q->position = position;
			q->scale = scale;
			// Determine the bounds based on the highest LOD
			q->worldBounds = calculateBounds(
				(*q->geometryLodList)[0].vertexData,
					position, orientation, scale);

			mQueuedSubMeshes.push_back(q);
		}
	}
	//--------------------------------------------------------------------------
	StaticGeometry::SubMeshLodGeometryLinkList*
	StaticGeometry::determineGeometry(SubMesh* sm)
	{
		// First, determine if we've already seen this submesh before
		SubMeshGeometryLookup::iterator i =
			mSubMeshGeometryLookup.find(sm);
		if (i != mSubMeshGeometryLookup.end())
		{
			return i->second;
		}
		// Otherwise, we have to create a new one
		SubMeshLodGeometryLinkList* lodList = OGRE_NEW_T(SubMeshLodGeometryLinkList, MEMCATEGORY_GEOMETRY)();
		mSubMeshGeometryLookup[sm] = lodList;
		ushort numLods = sm->parent->isLodManual() ? 1 :
			sm->parent->getNumLodLevels();
		lodList->resize(numLods);
		for (ushort lod = 0; lod < numLods; ++lod)
		{
			SubMeshLodGeometryLink& geomLink = (*lodList)[lod];
			IndexData *lodIndexData;
			if (lod == 0)
			{
				lodIndexData = sm->indexData;
			}
			else
			{
				lodIndexData = sm->mLodFaceList[lod - 1];
			}
			// Can use the original mesh geometry?
			if (sm->useSharedVertices)
			{
				if (sm->parent->getNumSubMeshes() == 1)
				{
					// Ok, this is actually our own anyway
					geomLink.vertexData = sm->parent->sharedVertexData;
					geomLink.indexData = lodIndexData;
				}
				else
				{
					// We have to split it
					splitGeometry(sm->parent->sharedVertexData,
						lodIndexData, &geomLink);
				}
			}
			else
			{
				if (lod == 0)
				{
					// Ok, we can use the existing geometry; should be in full
					// use by just this SubMesh
					geomLink.vertexData = sm->vertexData;
					geomLink.indexData = sm->indexData;
				}
				else
				{
					// We have to split it
					splitGeometry(sm->vertexData,
						lodIndexData, &geomLink);
				}
			}
			assert (geomLink.vertexData->vertexStart == 0 &&
				"Cannot use vertexStart > 0 on indexed geometry due to "
				"rendersystem incompatibilities - see the docs!");
		}


		return lodList;
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::splitGeometry(VertexData* vd, IndexData* id,
			StaticGeometry::SubMeshLodGeometryLink* targetGeomLink)
	{
		// Firstly we need to scan to see how many vertices are being used
		// and while we're at it, build the remap we can use later
		bool use32bitIndexes =
			id->indexBuffer->getType() == HardwareIndexBuffer::IT_32BIT;
		uint16 *p16;
		uint32 *p32;
		IndexRemap indexRemap;
		if (use32bitIndexes)
		{
			p32 = static_cast<uint32*>(id->indexBuffer->lock(
				id->indexStart, 
				id->indexCount * id->indexBuffer->getIndexSize(), 
				HardwareBuffer::HBL_READ_ONLY));
			buildIndexRemap(p32, id->indexCount, indexRemap);
			id->indexBuffer->unlock();
		}
		else
		{
			p16 = static_cast<uint16*>(id->indexBuffer->lock(
				id->indexStart, 
				id->indexCount * id->indexBuffer->getIndexSize(), 
				HardwareBuffer::HBL_READ_ONLY));
			buildIndexRemap(p16, id->indexCount, indexRemap);
			id->indexBuffer->unlock();
		}
		if (indexRemap.size() == vd->vertexCount)
		{
			// ha, complete usage after all
			targetGeomLink->vertexData = vd;
			targetGeomLink->indexData = id;
			return;
		}


		// Create the new vertex data records
		targetGeomLink->vertexData = vd->clone(false);
		// Convenience
		VertexData* newvd = targetGeomLink->vertexData;
		//IndexData* newid = targetGeomLink->indexData;
		// Update the vertex count
		newvd->vertexCount = indexRemap.size();

		size_t numvbufs = vd->vertexBufferBinding->getBufferCount();
		// Copy buffers from old to new
		for (unsigned short b = 0; b < numvbufs; ++b)
		{
			// Lock old buffer
			HardwareVertexBufferSharedPtr oldBuf =
				vd->vertexBufferBinding->getBuffer(b);
			// Create new buffer
			HardwareVertexBufferSharedPtr newBuf =
				HardwareBufferManager::getSingleton().createVertexBuffer(
					oldBuf->getVertexSize(),
					indexRemap.size(),
					HardwareBuffer::HBU_STATIC);
			// rebind
			newvd->vertexBufferBinding->setBinding(b, newBuf);

			// Copy all the elements of the buffer across, by iterating over
			// the IndexRemap which describes how to move the old vertices
			// to the new ones. By nature of the map the remap is in order of
			// indexes in the old buffer, but note that we're not guaranteed to
			// address every vertex (which is kinda why we're here)
			uchar* pSrcBase = static_cast<uchar*>(
				oldBuf->lock(HardwareBuffer::HBL_READ_ONLY));
			uchar* pDstBase = static_cast<uchar*>(
				newBuf->lock(HardwareBuffer::HBL_DISCARD));
			size_t vertexSize = oldBuf->getVertexSize();
			// Buffers should be the same size
			assert (vertexSize == newBuf->getVertexSize());

			for (IndexRemap::iterator r = indexRemap.begin();
				r != indexRemap.end(); ++r)
			{
				assert (r->first < oldBuf->getNumVertices());
				assert (r->second < newBuf->getNumVertices());

				uchar* pSrc = pSrcBase + r->first * vertexSize;
				uchar* pDst = pDstBase + r->second * vertexSize;
				memcpy(pDst, pSrc, vertexSize);
			}
			// unlock
			oldBuf->unlock();
			newBuf->unlock();

		}

		// Now create a new index buffer
		HardwareIndexBufferSharedPtr ibuf =
			HardwareBufferManager::getSingleton().createIndexBuffer(
				id->indexBuffer->getType(), id->indexCount,
				HardwareBuffer::HBU_STATIC);

		if (use32bitIndexes)
		{
			uint32 *pSrc32, *pDst32;
			pSrc32 = static_cast<uint32*>(id->indexBuffer->lock(
				id->indexStart, 
				id->indexCount * id->indexBuffer->getIndexSize(), 
				HardwareBuffer::HBL_READ_ONLY));
			pDst32 = static_cast<uint32*>(ibuf->lock(
				HardwareBuffer::HBL_DISCARD));
			remapIndexes(pSrc32, pDst32, indexRemap, id->indexCount);
			id->indexBuffer->unlock();
			ibuf->unlock();
		}
		else
		{
			uint16 *pSrc16, *pDst16;
			pSrc16 = static_cast<uint16*>(id->indexBuffer->lock(
				id->indexStart, 
				id->indexCount * id->indexBuffer->getIndexSize(), 
				HardwareBuffer::HBL_READ_ONLY));
			pDst16 = static_cast<uint16*>(ibuf->lock(
				HardwareBuffer::HBL_DISCARD));
			remapIndexes(pSrc16, pDst16, indexRemap, id->indexCount);
			id->indexBuffer->unlock();
			ibuf->unlock();
		}

		targetGeomLink->indexData = OGRE_NEW IndexData();
		targetGeomLink->indexData->indexStart = 0;
		targetGeomLink->indexData->indexCount = id->indexCount;
		targetGeomLink->indexData->indexBuffer = ibuf;

		// Store optimised geometry for deallocation later
		OptimisedSubMeshGeometry *optGeom = OGRE_NEW OptimisedSubMeshGeometry();
		optGeom->indexData = targetGeomLink->indexData;
		optGeom->vertexData = targetGeomLink->vertexData;
		mOptimisedSubMeshGeometryList.push_back(optGeom);
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::addSceneNode(const SceneNode* node)
	{
		SceneNode::ConstObjectIterator obji = node->getAttachedObjectIterator();
		while (obji.hasMoreElements())
		{
			MovableObject* mobj = obji.getNext();
			if (mobj->getMovableType() == "Entity")
			{
				addEntity(static_cast<Entity*>(mobj),
					node->_getDerivedPosition(),
					node->_getDerivedOrientation(),
					node->_getDerivedScale());
			}
		}
		// Iterate through all the child-nodes
		SceneNode::ConstChildNodeIterator nodei = node->getChildIterator();

		while (nodei.hasMoreElements())
		{
			const SceneNode* node = static_cast<const SceneNode*>(nodei.getNext());
			// Add this subnode and its children...
			addSceneNode( node );
		}
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::build(void)
	{
		// Make sure there's nothing from previous builds
		destroy();

		// Firstly allocate meshes to regions
		for (QueuedSubMeshList::iterator qi = mQueuedSubMeshes.begin();
			qi != mQueuedSubMeshes.end(); ++qi)
		{
			QueuedSubMesh* qsm = *qi;
			Region* region = getRegion(qsm->worldBounds, true);
			region->assign(qsm);
		}
		bool stencilShadows = false;
		if (mCastShadows && mOwner->isShadowTechniqueStencilBased())
		{
			stencilShadows = true;
		}

		// Now tell each region to build itself
		for (RegionMap::iterator ri = mRegionMap.begin();
			ri != mRegionMap.end(); ++ri)
		{
			ri->second->build(stencilShadows);
		}

	}
	//--------------------------------------------------------------------------
	void StaticGeometry::destroy(void)
	{
		// delete the regions
		for (RegionMap::iterator i = mRegionMap.begin();
			i != mRegionMap.end(); ++i)
		{
			mOwner->extractMovableObject(i->second);
			OGRE_DELETE i->second;
		}
		mRegionMap.clear();
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::reset(void)
	{
		destroy();
		for (QueuedSubMeshList::iterator i = mQueuedSubMeshes.begin();
			i != mQueuedSubMeshes.end(); ++i)
		{
			OGRE_DELETE *i;
		}
		mQueuedSubMeshes.clear();
		// Delete precached geoemtry lists
		for (SubMeshGeometryLookup::iterator l = mSubMeshGeometryLookup.begin();
			l != mSubMeshGeometryLookup.end(); ++l)
		{
			OGRE_DELETE_T(l->second, SubMeshLodGeometryLinkList, MEMCATEGORY_GEOMETRY);
		}
		mSubMeshGeometryLookup.clear();
		// Delete optimised geometry
		for (OptimisedSubMeshGeometryList::iterator o = mOptimisedSubMeshGeometryList.begin();
			o != mOptimisedSubMeshGeometryList.end(); ++o)
		{
			OGRE_DELETE *o;
		}
		mOptimisedSubMeshGeometryList.clear();

	}
	//--------------------------------------------------------------------------
	void StaticGeometry::setVisible(bool visible)
	{
		mVisible = visible;
		// tell any existing regions
		for (RegionMap::iterator ri = mRegionMap.begin();
			ri != mRegionMap.end(); ++ri)
		{
			ri->second->setVisible(visible);
		}
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::setCastShadows(bool castShadows)
	{
		mCastShadows = castShadows;
		// tell any existing regions
		for (RegionMap::iterator ri = mRegionMap.begin();
			ri != mRegionMap.end(); ++ri)
		{
			ri->second->setCastShadows(castShadows);
		}

	}
	//--------------------------------------------------------------------------
    void StaticGeometry::setRenderQueueGroup(uint8 queueID)
	{
		assert(queueID <= RENDER_QUEUE_MAX && "Render queue out of range!");
		mRenderQueueIDSet = true;
		mRenderQueueID = queueID;
		// tell any existing regions
		for (RegionMap::iterator ri = mRegionMap.begin();
			ri != mRegionMap.end(); ++ri)
		{
			ri->second->setRenderQueueGroup(queueID);
		}
	}
	//--------------------------------------------------------------------------
	uint8 StaticGeometry::getRenderQueueGroup(void) const
	{
		return mRenderQueueID;
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::dump(const String& filename) const
	{
		std::ofstream of(filename.c_str());
		of << "Static Geometry Report for " << mName << std::endl;
		of << "-------------------------------------------------" << std::endl;
		of << "Number of queued submeshes: " << mQueuedSubMeshes.size() << std::endl;
		of << "Number of regions: " << mRegionMap.size() << std::endl;
		of << "Region dimensions: " << mRegionDimensions << std::endl;
		of << "Origin: " << mOrigin << std::endl;
		of << "Max distance: " << mUpperDistance << std::endl;
		of << "Casts shadows?: " << mCastShadows << std::endl;
		of << std::endl;
		for (RegionMap::const_iterator ri = mRegionMap.begin();
			ri != mRegionMap.end(); ++ri)
		{
			ri->second->dump(of);
		}
		of << "-------------------------------------------------" << std::endl;
	}
	//---------------------------------------------------------------------
	void StaticGeometry::visitRenderables(Renderable::Visitor* visitor, 
		bool debugRenderables)
	{
		for (RegionMap::const_iterator ri = mRegionMap.begin();
			ri != mRegionMap.end(); ++ri)
		{
			ri->second->visitRenderables(visitor, debugRenderables);
		}

	}
	//--------------------------------------------------------------------------
	StaticGeometry::RegionIterator StaticGeometry::getRegionIterator(void)
	{
		return RegionIterator(mRegionMap.begin(), mRegionMap.end());
	}
	//--------------------------------------------------------------------------
	//--------------------------------------------------------------------------
	StaticGeometry::Region::Region(StaticGeometry* parent, const String& name,
		SceneManager* mgr, uint32 regionID, const Vector3& centre)
		: MovableObject(name), mParent(parent), mSceneMgr(mgr), mNode(0),
		mRegionID(regionID), mCentre(centre), mBoundingRadius(0.0f),
		mCurrentLod(0)
	{
		// First LOD mandatory, and always from 0
		mLodSquaredDistances.push_back(0.0f);
	}
	//--------------------------------------------------------------------------
	StaticGeometry::Region::~Region()
	{
		if (mNode)
		{
			mNode->getParentSceneNode()->removeChild(mNode);
			mSceneMgr->destroySceneNode(mNode->getName());
			mNode = 0;
		}
		// delete
		for (LODBucketList::iterator i = mLodBucketList.begin();
			i != mLodBucketList.end(); ++i)
		{
			OGRE_DELETE *i;
		}
		mLodBucketList.clear();

		// no need to delete queued meshes, these are managed in StaticGeometry

	}
	//--------------------------------------------------------------------------
	uint32 StaticGeometry::Region::getTypeFlags(void) const
	{
		return SceneManager::STATICGEOMETRY_TYPE_MASK;
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::Region::assign(QueuedSubMesh* qmesh)
	{
		mQueuedSubMeshes.push_back(qmesh);
		// update lod distances
		ushort lodLevels = qmesh->submesh->parent->getNumLodLevels();
		assert(qmesh->geometryLodList->size() == lodLevels);

		while(mLodSquaredDistances.size() < lodLevels)
		{
			mLodSquaredDistances.push_back(0.0f);
		}
		// Make sure LOD levels are max of all at the requested level
		for (ushort lod = 1; lod < lodLevels; ++lod)
		{
			const MeshLodUsage& meshLod =
				qmesh->submesh->parent->getLodLevel(lod);
			mLodSquaredDistances[lod] = std::max(mLodSquaredDistances[lod],
				meshLod.fromDepthSquared);
		}

		// update bounds
		// Transform world bounds relative to our centre
		AxisAlignedBox localBounds(
			qmesh->worldBounds.getMinimum() - mCentre,
			qmesh->worldBounds.getMaximum() - mCentre);
		mAABB.merge(localBounds);
		mBoundingRadius = Math::boundingRadiusFromAABB(mAABB);

	}
	//--------------------------------------------------------------------------
	void StaticGeometry::Region::build(bool stencilShadows)
	{
		// Create a node
		mNode = mSceneMgr->getRootSceneNode()->createChildSceneNode(mName,
			mCentre);
		mNode->attachObject(this);
		// We need to create enough LOD buckets to deal with the highest LOD
		// we encountered in all the meshes queued
		for (ushort lod = 0; lod < mLodSquaredDistances.size(); ++lod)
		{
			LODBucket* lodBucket =
				OGRE_NEW LODBucket(this, lod, mLodSquaredDistances[lod]);
			mLodBucketList.push_back(lodBucket);
			// Now iterate over the meshes and assign to LODs
			// LOD bucket will pick the right LOD to use
			QueuedSubMeshList::iterator qi, qiend;
			qiend = mQueuedSubMeshes.end();
			for (qi = mQueuedSubMeshes.begin(); qi != qiend; ++qi)
			{
				lodBucket->assign(*qi, lod);
			}
			// now build
			lodBucket->build(stencilShadows);
		}



	}
	//--------------------------------------------------------------------------
	const String& StaticGeometry::Region::getMovableType(void) const
	{
		static String sType = "StaticGeometry";
		return sType;
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::Region::_notifyCurrentCamera(Camera* cam)
	{
		// Calculate squared view depth
		Vector3 diff = cam->getLodCamera()->getDerivedPosition() - mCentre;
		Real squaredDepth = diff.squaredLength();

		// Determine whether to still render
		Real renderingDist = mParent->getRenderingDistance();
		if (renderingDist > 0)
		{
			// Max distance to still render
			Real maxDist = renderingDist + mBoundingRadius;
			if (squaredDepth > Math::Sqr(maxDist))
			{
				mBeyondFarDistance = true;
				return;
			}
		}

		mBeyondFarDistance = false;

		// Distance from the edge of the bounding sphere
		mCamDistanceSquared = squaredDepth - mBoundingRadius * mBoundingRadius;
		// Clamp to 0
		mCamDistanceSquared = std::max(static_cast<Real>(0.0), mCamDistanceSquared);

		// Determine active lod
		mCurrentLod = static_cast<ushort>(mLodSquaredDistances.size() - 1);
		for (ushort i = 0; i < mLodSquaredDistances.size(); ++i)
		{
			if (mLodSquaredDistances[i] > mCamDistanceSquared)
			{
				mCurrentLod = i - 1;
				break;
			}
		}

	}
	//--------------------------------------------------------------------------
	const AxisAlignedBox& StaticGeometry::Region::getBoundingBox(void) const
	{
		return mAABB;
	}
	//--------------------------------------------------------------------------
	Real StaticGeometry::Region::getBoundingRadius(void) const
	{
		return mBoundingRadius;
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::Region::_updateRenderQueue(RenderQueue* queue)
	{
		mLodBucketList[mCurrentLod]->addRenderables(queue, mRenderQueueID,
			mCamDistanceSquared);
	}
	//---------------------------------------------------------------------
	void StaticGeometry::Region::visitRenderables(Renderable::Visitor* visitor, 
		bool debugRenderables)
	{
		for (LODBucketList::iterator i = mLodBucketList.begin(); i != mLodBucketList.end(); ++i)
		{
			(*i)->visitRenderables(visitor, debugRenderables);
		}

	}
	//--------------------------------------------------------------------------
	bool StaticGeometry::Region::isVisible(void) const
	{
		return mVisible && !mBeyondFarDistance;
	}
	//--------------------------------------------------------------------------
	StaticGeometry::Region::LODIterator
	StaticGeometry::Region::getLODIterator(void)
	{
		return LODIterator(mLodBucketList.begin(), mLodBucketList.end());
	}
	//---------------------------------------------------------------------
	ShadowCaster::ShadowRenderableListIterator
	StaticGeometry::Region::getShadowVolumeRenderableIterator(
		ShadowTechnique shadowTechnique, const Light* light,
		HardwareIndexBufferSharedPtr* indexBuffer,
		bool extrude, Real extrusionDistance, unsigned long flags)
	{
		// Calculate the object space light details
		Vector4 lightPos = light->getAs4DVector();
		Matrix4 world2Obj = mParentNode->_getFullTransform().inverseAffine();
		lightPos = world2Obj.transformAffine(lightPos);

		// per-LOD shadow lists & edge data
		mLodBucketList[mCurrentLod]->updateShadowRenderables(
			shadowTechnique, lightPos, indexBuffer, extrude, extrusionDistance, flags);
		
		EdgeData* edgeList = mLodBucketList[mCurrentLod]->getEdgeList();
		ShadowRenderableList& shadowRendList = mLodBucketList[mCurrentLod]->getShadowRenderableList();

		// Calc triangle light facing
		updateEdgeListLightFacing(edgeList, lightPos);

		// Generate indexes and update renderables
		generateShadowVolume(edgeList, *indexBuffer, light,
			shadowRendList, flags);


		return ShadowCaster::ShadowRenderableListIterator(shadowRendList.begin(), shadowRendList.end());

	}
	//--------------------------------------------------------------------------
	EdgeData* StaticGeometry::Region::getEdgeList(void)
	{
		return mLodBucketList[mCurrentLod]->getEdgeList();
	}
	//--------------------------------------------------------------------------
	bool StaticGeometry::Region::hasEdgeList(void)
	{
		return getEdgeList() != 0;
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::Region::dump(std::ofstream& of) const
	{
		of << "Region " << mRegionID << std::endl;
		of << "--------------------------" << std::endl;
		of << "Centre: " << mCentre << std::endl;
		of << "Local AABB: " << mAABB << std::endl;
		of << "Bounding radius: " << mBoundingRadius << std::endl;
		of << "Number of LODs: " << mLodBucketList.size() << std::endl;

		for (LODBucketList::const_iterator i = mLodBucketList.begin();
			i != mLodBucketList.end(); ++i)
		{
			(*i)->dump(of);
		}
		of << "--------------------------" << std::endl;
	}
	//--------------------------------------------------------------------------
	//--------------------------------------------------------------------------
	StaticGeometry::LODBucket::LODShadowRenderable::LODShadowRenderable(
		LODBucket* parent, HardwareIndexBufferSharedPtr* indexBuffer,
		const VertexData* vertexData, bool createSeparateLightCap,
		bool isLightCap)
		: mParent(parent)
	{
		// Initialise render op
		mRenderOp.indexData = OGRE_NEW IndexData();
		mRenderOp.indexData->indexBuffer = *indexBuffer;
		mRenderOp.indexData->indexStart = 0;
		// index start and count are sorted out later

		// Create vertex data which just references position component (and 2 component)
		mRenderOp.vertexData = OGRE_NEW VertexData();
		// Map in position data
		mRenderOp.vertexData->vertexDeclaration->addElement(0,0,VET_FLOAT3, VES_POSITION);
		ushort origPosBind =
			vertexData->vertexDeclaration->findElementBySemantic(VES_POSITION)->getSource();
		mPositionBuffer = vertexData->vertexBufferBinding->getBuffer(origPosBind);
		mRenderOp.vertexData->vertexBufferBinding->setBinding(0, mPositionBuffer);
		// Map in w-coord buffer (if present)
		if(!vertexData->hardwareShadowVolWBuffer.isNull())
		{
			mRenderOp.vertexData->vertexDeclaration->addElement(1,0,VET_FLOAT1, VES_TEXTURE_COORDINATES, 0);
			mWBuffer = vertexData->hardwareShadowVolWBuffer;
			mRenderOp.vertexData->vertexBufferBinding->setBinding(1, mWBuffer);
		}
		// Use same vertex start as input
		mRenderOp.vertexData->vertexStart = vertexData->vertexStart;

		if (isLightCap)
		{
			// Use original vertex count, no extrusion
			mRenderOp.vertexData->vertexCount = vertexData->vertexCount;
		}
		else
		{
			// Vertex count must take into account the doubling of the buffer,
			// because second half of the buffer is the extruded copy
			mRenderOp.vertexData->vertexCount =
				vertexData->vertexCount * 2;
			if (createSeparateLightCap)
			{
				// Create child light cap
				mLightCap = OGRE_NEW LODShadowRenderable(parent,
					indexBuffer, vertexData, false, true);
			}
		}
	}
	//--------------------------------------------------------------------------
	StaticGeometry::LODBucket::LODShadowRenderable::~LODShadowRenderable()
	{
		OGRE_DELETE mRenderOp.indexData;
		OGRE_DELETE mRenderOp.vertexData;
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::LODBucket::LODShadowRenderable::getWorldTransforms(
		Matrix4* xform) const
	{
		// pretransformed
		*xform = mParent->getParent()->_getParentNodeFullTransform();
	}
	//--------------------------------------------------------------------------
	//--------------------------------------------------------------------------
	StaticGeometry::LODBucket::LODBucket(Region* parent, unsigned short lod,
		Real lodDist)
		: mParent(parent), mLod(lod), mSquaredDistance(lodDist), mEdgeList(0)
		, mVertexProgramInUse(false)
	{
	}
	//--------------------------------------------------------------------------
	StaticGeometry::LODBucket::~LODBucket()
	{
		OGRE_DELETE mEdgeList;
		for (ShadowCaster::ShadowRenderableList::iterator s = mShadowRenderables.begin();
			s != mShadowRenderables.end(); ++s)
		{
			OGRE_DELETE *s;
		}
		mShadowRenderables.clear();
		// delete
		for (MaterialBucketMap::iterator i = mMaterialBucketMap.begin();
			i != mMaterialBucketMap.end(); ++i)
		{
			OGRE_DELETE i->second;
		}
		mMaterialBucketMap.clear();
		for(QueuedGeometryList::iterator qi = mQueuedGeometryList.begin();
			qi != mQueuedGeometryList.end(); ++qi)
		{
			OGRE_DELETE *qi;
		}
		mQueuedGeometryList.clear();

		// no need to delete queued meshes, these are managed in StaticGeometry
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::LODBucket::assign(QueuedSubMesh* qmesh, ushort atLod)
	{
		QueuedGeometry* q = OGRE_NEW QueuedGeometry();
		mQueuedGeometryList.push_back(q);
		q->position = qmesh->position;
		q->orientation = qmesh->orientation;
		q->scale = qmesh->scale;
		if (qmesh->geometryLodList->size() > atLod)
		{
			// This submesh has enough lods, use the right one
			q->geometry = &(*qmesh->geometryLodList)[atLod];
		}
		else
		{
			// Not enough lods, use the lowest one we have
			q->geometry =
				&(*qmesh->geometryLodList)[qmesh->geometryLodList->size() - 1];
		}
		// Locate a material bucket
		MaterialBucket* mbucket = 0;
		MaterialBucketMap::iterator m =
			mMaterialBucketMap.find(qmesh->materialName);
		if (m != mMaterialBucketMap.end())
		{
			mbucket = m->second;
		}
		else
		{
			mbucket = OGRE_NEW MaterialBucket(this, qmesh->materialName);
			mMaterialBucketMap[qmesh->materialName] = mbucket;
		}
		mbucket->assign(q);
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::LODBucket::build(bool stencilShadows)
	{

		EdgeListBuilder eb;
		size_t vertexSet = 0;

		// Just pass this on to child buckets
		for (MaterialBucketMap::iterator i = mMaterialBucketMap.begin();
			i != mMaterialBucketMap.end(); ++i)
		{
			MaterialBucket* mat = i->second;

			mat->build(stencilShadows);

			if (stencilShadows)
			{
				MaterialBucket::GeometryIterator geomIt =
					mat->getGeometryIterator();
				// Check if we have vertex programs here
				Technique* t = mat->getMaterial()->getBestTechnique();
				if (t)
				{
					Pass* p = t->getPass(0);
					if (p)
					{
						if (p->hasVertexProgram())
						{
							mVertexProgramInUse = true;
						}
					}
				}

				while (geomIt.hasMoreElements())
				{
					GeometryBucket* geom = geomIt.getNext();

					// Check we're dealing with 16-bit indexes here
					// Since stencil shadows can only deal with 16-bit
					// More than that and stencil is probably too CPU-heavy
					// in any case
					assert(geom->getIndexData()->indexBuffer->getType()
						== HardwareIndexBuffer::IT_16BIT &&
						"Only 16-bit indexes allowed when using stencil shadows");
					eb.addVertexData(geom->getVertexData());
					eb.addIndexData(geom->getIndexData(), vertexSet++);
				}

			}
		}

		if (stencilShadows)
		{
			mEdgeList = eb.build();
		}
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::LODBucket::addRenderables(RenderQueue* queue,
		uint8 group, Real camDistanceSquared)
	{
		// Just pass this on to child buckets
		MaterialBucketMap::iterator i, iend;
		iend =  mMaterialBucketMap.end();
		for (i = mMaterialBucketMap.begin(); i != iend; ++i)
		{
			i->second->addRenderables(queue, group, camDistanceSquared);
		}
	}
	//--------------------------------------------------------------------------
	StaticGeometry::LODBucket::MaterialIterator
	StaticGeometry::LODBucket::getMaterialIterator(void)
	{
		return MaterialIterator(
			mMaterialBucketMap.begin(), mMaterialBucketMap.end());
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::LODBucket::dump(std::ofstream& of) const
	{
		of << "LOD Bucket " << mLod << std::endl;
		of << "------------------" << std::endl;
		of << "Distance: " << Math::Sqrt(mSquaredDistance) << std::endl;
		of << "Number of Materials: " << mMaterialBucketMap.size() << std::endl;
		for (MaterialBucketMap::const_iterator i = mMaterialBucketMap.begin();
			i != mMaterialBucketMap.end(); ++i)
		{
			i->second->dump(of);
		}
		of << "------------------" << std::endl;

	}
	//---------------------------------------------------------------------
	void StaticGeometry::LODBucket::visitRenderables(Renderable::Visitor* visitor, 
		bool debugRenderables)
	{
		for (MaterialBucketMap::const_iterator i = mMaterialBucketMap.begin();
			i != mMaterialBucketMap.end(); ++i)
		{
			i->second->visitRenderables(visitor, debugRenderables);
		}

	}
	//---------------------------------------------------------------------
	void StaticGeometry::LODBucket::updateShadowRenderables(
		ShadowTechnique shadowTechnique, const Vector4& lightPos, 
		HardwareIndexBufferSharedPtr* indexBuffer, bool extrude, 
		Real extrusionDistance, unsigned long flags /* = 0  */)
	{
		assert(indexBuffer && "Only external index buffers are supported right now");
		assert((*indexBuffer)->getType() == HardwareIndexBuffer::IT_16BIT &&
			"Only 16-bit indexes supported for now");

		// We need to search the edge list for silhouette edges
		if (!mEdgeList)
		{
			OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
				"You enabled stencil shadows after the buid process!",
				"StaticGeometry::LODBucket::getShadowVolumeRenderableIterator");
		}

		// Init shadow renderable list if required
		bool init = mShadowRenderables.empty();

		EdgeData::EdgeGroupList::iterator egi;
		ShadowCaster::ShadowRenderableList::iterator si, siend;
		LODShadowRenderable* esr = 0;
		if (init)
			mShadowRenderables.resize(mEdgeList->edgeGroups.size());

		//bool updatedSharedGeomNormals = false;
		siend = mShadowRenderables.end();
		egi = mEdgeList->edgeGroups.begin();
		for (si = mShadowRenderables.begin(); si != siend; ++si, ++egi)
		{
			if (init)
			{
				// Create a new renderable, create a separate light cap if
				// we're using a vertex program (either for this model, or
				// for extruding the shadow volume) since otherwise we can
				// get depth-fighting on the light cap

				*si = OGRE_NEW LODShadowRenderable(this, indexBuffer,
					egi->vertexData, mVertexProgramInUse || !extrude);
			}
			// Get shadow renderable
			esr = static_cast<LODShadowRenderable*>(*si);
			HardwareVertexBufferSharedPtr esrPositionBuffer = esr->getPositionBuffer();
			// Extrude vertices in software if required
			if (extrude)
			{
				mParent->extrudeVertices(esrPositionBuffer,
					egi->vertexData->vertexCount,
					lightPos, extrusionDistance);

			}

		}

	}
	//--------------------------------------------------------------------------
	//--------------------------------------------------------------------------
	StaticGeometry::MaterialBucket::MaterialBucket(LODBucket* parent,
		const String& materialName)
		: mParent(parent), mMaterialName(materialName)
	{
	}
	//--------------------------------------------------------------------------
	StaticGeometry::MaterialBucket::~MaterialBucket()
	{
		// delete
		for (GeometryBucketList::iterator i = mGeometryBucketList.begin();
			i != mGeometryBucketList.end(); ++i)
		{
			OGRE_DELETE *i;
		}
		mGeometryBucketList.clear();

		// no need to delete queued meshes, these are managed in StaticGeometry
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::MaterialBucket::assign(QueuedGeometry* qgeom)
	{
		// Look up any current geometry
		String formatString = getGeometryFormatString(qgeom->geometry);
		CurrentGeometryMap::iterator gi = mCurrentGeometryMap.find(formatString);
		bool newBucket = true;
		if (gi != mCurrentGeometryMap.end())
		{
			// Found existing geometry, try to assign
			newBucket = !gi->second->assign(qgeom);
			// Note that this bucket will be replaced as the 'current'
			// for this format string below since it's out of space
		}
		// Do we need to create a new one?
		if (newBucket)
		{
			GeometryBucket* gbucket = OGRE_NEW GeometryBucket(this, formatString,
				qgeom->geometry->vertexData, qgeom->geometry->indexData);
			// Add to main list
			mGeometryBucketList.push_back(gbucket);
			// Also index in 'current' list
			mCurrentGeometryMap[formatString] = gbucket;
			if (!gbucket->assign(qgeom))
			{
				OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR,
					"Somehow we couldn't fit the requested geometry even in a "
					"brand new GeometryBucket!! Must be a bug, please report.",
					"StaticGeometry::MaterialBucket::assign");
			}
		}
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::MaterialBucket::build(bool stencilShadows)
	{
		mTechnique = 0;
		mMaterial = MaterialManager::getSingleton().getByName(mMaterialName);
		if (mMaterial.isNull())
		{
			OGRE_EXCEPT(Exception::ERR_ITEM_NOT_FOUND,
				"Material '" + mMaterialName + "' not found.",
				"StaticGeometry::MaterialBucket::build");
		}
		mMaterial->load();
		// tell the geometry buckets to build
		for (GeometryBucketList::iterator i = mGeometryBucketList.begin();
			i != mGeometryBucketList.end(); ++i)
		{
			(*i)->build(stencilShadows);
		}
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::MaterialBucket::addRenderables(RenderQueue* queue,
		uint8 group, Real camDistanceSquared)
	{
		// Determine the current material technique
		mTechnique = mMaterial->getBestTechnique(
			mMaterial->getLodIndexSquaredDepth(camDistanceSquared));

		GeometryBucketList::iterator i, iend;
		iend =  mGeometryBucketList.end();
		for (i = mGeometryBucketList.begin(); i != iend; ++i)
		{
			queue->addRenderable(*i, group);
		}

	}
	//--------------------------------------------------------------------------
	String StaticGeometry::MaterialBucket::getGeometryFormatString(
		SubMeshLodGeometryLink* geom)
	{
		// Formulate an identifying string for the geometry format
		// Must take into account the vertex declaration and the index type
		// Format is (all lines separated by '|'):
		// Index type
		// Vertex element (repeating)
		//   source
		//   semantic
		//   type
		StringUtil::StrStreamType str;

		str << geom->indexData->indexBuffer->getType() << "|";
		const VertexDeclaration::VertexElementList& elemList =
			geom->vertexData->vertexDeclaration->getElements();
		VertexDeclaration::VertexElementList::const_iterator ei, eiend;
		eiend = elemList.end();
		for (ei = elemList.begin(); ei != eiend; ++ei)
		{
			const VertexElement& elem = *ei;
			str << elem.getSource() << "|";
			str << elem.getSource() << "|";
			str << elem.getSemantic() << "|";
			str << elem.getType() << "|";
		}

		return str.str();

	}
	//--------------------------------------------------------------------------
	StaticGeometry::MaterialBucket::GeometryIterator
	StaticGeometry::MaterialBucket::getGeometryIterator(void)
	{
		return GeometryIterator(
			mGeometryBucketList.begin(), mGeometryBucketList.end());
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::MaterialBucket::dump(std::ofstream& of) const
	{
		of << "Material Bucket " << mMaterialName << std::endl;
		of << "--------------------------------------------------" << std::endl;
		of << "Geometry buckets: " << mGeometryBucketList.size() << std::endl;
		for (GeometryBucketList::const_iterator i = mGeometryBucketList.begin();
			i != mGeometryBucketList.end(); ++i)
		{
			(*i)->dump(of);
		}
		of << "--------------------------------------------------" << std::endl;

	}
	//---------------------------------------------------------------------
	void StaticGeometry::MaterialBucket::visitRenderables(Renderable::Visitor* visitor, 
		bool debugRenderables)
	{
		for (GeometryBucketList::const_iterator i = mGeometryBucketList.begin();
			i != mGeometryBucketList.end(); ++i)
		{
			visitor->visit(*i, mParent->getLod(), false);
		}

	}
	//--------------------------------------------------------------------------
	//--------------------------------------------------------------------------
	StaticGeometry::GeometryBucket::GeometryBucket(MaterialBucket* parent,
		const String& formatString, const VertexData* vData,
		const IndexData* iData)
		: Renderable(), mParent(parent), mFormatString(formatString)
	{
		// Clone the structure from the example
		mVertexData = vData->clone(false);
		mIndexData = iData->clone(false);
		mVertexData->vertexCount = 0;
		mVertexData->vertexStart = 0;
		mIndexData->indexCount = 0;
		mIndexData->indexStart = 0;
		mIndexType = iData->indexBuffer->getType();
		// Derive the max vertices
		if (mIndexType == HardwareIndexBuffer::IT_32BIT)
		{
			mMaxVertexIndex = 0xFFFFFFFF;
		}
		else
		{
			mMaxVertexIndex = 0xFFFF;
		}

		// Check to see if we have blend indices / blend weights
		// remove them if so, they can try to blend non-existent bones!
		const VertexElement* blendIndices =
			mVertexData->vertexDeclaration->findElementBySemantic(VES_BLEND_INDICES);
		const VertexElement* blendWeights =
			mVertexData->vertexDeclaration->findElementBySemantic(VES_BLEND_WEIGHTS);
		if (blendIndices && blendWeights)
		{
			assert(blendIndices->getSource() == blendWeights->getSource()
				&& "Blend indices and weights should be in the same buffer");
			// Get the source
			ushort source = blendIndices->getSource();
			assert(blendIndices->getSize() + blendWeights->getSize() ==
				mVertexData->vertexBufferBinding->getBuffer(source)->getVertexSize()
				&& "Blend indices and blend buffers should have buffer to themselves!");
			// Unset the buffer
			mVertexData->vertexBufferBinding->unsetBinding(source);
			// Remove the elements
			mVertexData->vertexDeclaration->removeElement(VES_BLEND_INDICES);
			mVertexData->vertexDeclaration->removeElement(VES_BLEND_WEIGHTS);
            // Close gaps in bindings for effective and safely
            mVertexData->closeGapsInBindings();
		}


	}
	//--------------------------------------------------------------------------
	StaticGeometry::GeometryBucket::~GeometryBucket()
	{
		OGRE_DELETE mVertexData;
		OGRE_DELETE mIndexData;
	}
	//--------------------------------------------------------------------------
	const MaterialPtr& StaticGeometry::GeometryBucket::getMaterial(void) const
	{
		return mParent->getMaterial();
	}
	//--------------------------------------------------------------------------
	Technique* StaticGeometry::GeometryBucket::getTechnique(void) const
	{
		return mParent->getCurrentTechnique();
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::GeometryBucket::getRenderOperation(RenderOperation& op)
	{
		op.indexData = mIndexData;
		op.operationType = RenderOperation::OT_TRIANGLE_LIST;
		op.srcRenderable = this;
		op.useIndexes = true;
		op.vertexData = mVertexData;
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::GeometryBucket::getWorldTransforms(Matrix4* xform) const
	{
		// Should be the identity transform, but lets allow transformation of the
		// nodes the regions are attached to for kicks
		*xform = mParent->getParent()->getParent()->_getParentNodeFullTransform();
	}
	//--------------------------------------------------------------------------
	Real StaticGeometry::GeometryBucket::getSquaredViewDepth(const Camera* cam) const
	{
		return mParent->getParent()->getSquaredDistance();
	}
	//--------------------------------------------------------------------------
	const LightList& StaticGeometry::GeometryBucket::getLights(void) const
	{
		return mParent->getParent()->getParent()->queryLights();
	}
	//--------------------------------------------------------------------------
	bool StaticGeometry::GeometryBucket::getCastsShadows(void) const
	{
		return mParent->getParent()->getParent()->getCastShadows();
	}
	//--------------------------------------------------------------------------
	bool StaticGeometry::GeometryBucket::assign(QueuedGeometry* qgeom)
	{
		// Do we have enough space?
		// -2 first to avoid overflow (-1 to adjust count to index, -1 to ensure
		// no overflow at 32 bits and use >= instead of >)
		if ((mVertexData->vertexCount - 2 + qgeom->geometry->vertexData->vertexCount)
			>= mMaxVertexIndex)
		{
			return false;
		}

		mQueuedGeometry.push_back(qgeom);
		mVertexData->vertexCount += qgeom->geometry->vertexData->vertexCount;
		mIndexData->indexCount += qgeom->geometry->indexData->indexCount;

		return true;
	}
	//--------------------------------------------------------------------------
	void StaticGeometry::GeometryBucket::build(bool stencilShadows)
	{
		// Ok, here's where we transfer the vertices and indexes to the shared
		// buffers
		// Shortcuts
		VertexDeclaration* dcl = mVertexData->vertexDeclaration;
		VertexBufferBinding* binds = mVertexData->vertexBufferBinding;

		// create index buffer, and lock
		mIndexData->indexBuffer = HardwareBufferManager::getSingleton()
			.createIndexBuffer(mIndexType, mIndexData->indexCount,
				HardwareBuffer::HBU_STATIC_WRITE_ONLY);
		uint32* p32Dest = 0;
		uint16* p16Dest = 0;
		if (mIndexType == HardwareIndexBuffer::IT_32BIT)
		{
			p32Dest = static_cast<uint32*>(
				mIndexData->indexBuffer->lock(HardwareBuffer::HBL_DISCARD));
		}
		else
		{
			p16Dest = static_cast<uint16*>(
				mIndexData->indexBuffer->lock(HardwareBuffer::HBL_DISCARD));
		}
		// create all vertex buffers, and lock
		ushort b;
		ushort posBufferIdx = dcl->findElementBySemantic(VES_POSITION)->getSource();

		std::vector<uchar*> destBufferLocks;
		std::vector<VertexDeclaration::VertexElementList> bufferElements;
		for (b = 0; b < binds->getBufferCount(); ++b)
		{
			size_t vertexCount = mVertexData->vertexCount;
			// Need to double the vertex count for the position buffer
			// if we're doing stencil shadows
			if (stencilShadows && b == posBufferIdx)
			{
				vertexCount = vertexCount * 2;
				assert(vertexCount <= mMaxVertexIndex &&
					"Index range exceeded when using stencil shadows, consider "
					"reducing your region size or reducing poly count");
			}
			HardwareVertexBufferSharedPtr vbuf =
				HardwareBufferManager::getSingleton().createVertexBuffer(
					dcl->getVertexSize(b),
					vertexCount,
					HardwareBuffer::HBU_STATIC_WRITE_ONLY);
			binds->setBinding(b, vbuf);
			uchar* pLock = static_cast<uchar*>(
				vbuf->lock(HardwareBuffer::HBL_DISCARD));
			destBufferLocks.push_back(pLock);
			// Pre-cache vertex elements per buffer
			bufferElements.push_back(dcl->findElementsBySource(b));
		}


		// Iterate over the geometry items
		size_t indexOffset = 0;
		QueuedGeometryList::iterator gi, giend;
		giend = mQueuedGeometry.end();
		Vector3 regionCentre = mParent->getParent()->getParent()->getCentre();
		for (gi = mQueuedGeometry.begin(); gi != giend; ++gi)
		{
			QueuedGeometry* geom = *gi;
			// Copy indexes across with offset
			IndexData* srcIdxData = geom->geometry->indexData;
			if (mIndexType == HardwareIndexBuffer::IT_32BIT)
			{
				// Lock source indexes
				uint32* pSrc = static_cast<uint32*>(
					srcIdxData->indexBuffer->lock(
						srcIdxData->indexStart, 
						srcIdxData->indexCount * srcIdxData->indexBuffer->getIndexSize(),
						HardwareBuffer::HBL_READ_ONLY));

				copyIndexes(pSrc, p32Dest, srcIdxData->indexCount, indexOffset);
				p32Dest += srcIdxData->indexCount;
				srcIdxData->indexBuffer->unlock();
			}
			else
			{
				// Lock source indexes
				uint16* pSrc = static_cast<uint16*>(
					srcIdxData->indexBuffer->lock(
					srcIdxData->indexStart, 
					srcIdxData->indexCount * srcIdxData->indexBuffer->getIndexSize(),
					HardwareBuffer::HBL_READ_ONLY));

				copyIndexes(pSrc, p16Dest, srcIdxData->indexCount, indexOffset);
				p16Dest += srcIdxData->indexCount;
				srcIdxData->indexBuffer->unlock();
			}

			// Now deal with vertex buffers
			// we can rely on buffer counts / formats being the same
			VertexData* srcVData = geom->geometry->vertexData;
			VertexBufferBinding* srcBinds = srcVData->vertexBufferBinding;
			for (b = 0; b < binds->getBufferCount(); ++b)
			{
				// lock source
				HardwareVertexBufferSharedPtr srcBuf =
					srcBinds->getBuffer(b);
				uchar* pSrcBase = static_cast<uchar*>(
					srcBuf->lock(HardwareBuffer::HBL_READ_ONLY));
				// Get buffer lock pointer, we'll update this later
				uchar* pDstBase = destBufferLocks[b];
				size_t bufInc = srcBuf->getVertexSize();

				// Iterate over vertices
				float *pSrcReal, *pDstReal;
				Vector3 tmp;
				for (size_t v = 0; v < srcVData->vertexCount; ++v)
				{
					// Iterate over vertex elements
					VertexDeclaration::VertexElementList& elems =
						bufferElements[b];
					VertexDeclaration::VertexElementList::iterator ei;
					for (ei = elems.begin(); ei != elems.end(); ++ei)
					{
						VertexElement& elem = *ei;
						elem.baseVertexPointerToElement(pSrcBase, &pSrcReal);
						elem.baseVertexPointerToElement(pDstBase, &pDstReal);
						switch (elem.getSemantic())
						{
						case VES_POSITION:
							tmp.x = *pSrcReal++;
							tmp.y = *pSrcReal++;
							tmp.z = *pSrcReal++;
							// transform
							tmp = (geom->orientation * (tmp * geom->scale)) +
								geom->position;
							// Adjust for region centre
							tmp -= regionCentre;
							*pDstReal++ = tmp.x;
							*pDstReal++ = tmp.y;
							*pDstReal++ = tmp.z;
							break;
						case VES_NORMAL:
						case VES_TANGENT:
						case VES_BINORMAL:
							tmp.x = *pSrcReal++;
							tmp.y = *pSrcReal++;
							tmp.z = *pSrcReal++;
							// scale (invert)
							tmp = tmp / geom->scale;
							tmp.normalise();
							// rotation
							tmp = geom->orientation * tmp;
							*pDstReal++ = tmp.x;
							*pDstReal++ = tmp.y;
							*pDstReal++ = tmp.z;
							// copy parity for tangent.
							if (elem.getType() == Ogre::VET_FLOAT4)
								*pDstReal = *pSrcReal;
							break;
						default:
							// just raw copy
							memcpy(pDstReal, pSrcReal,
									VertexElement::getTypeSize(elem.getType()));
							break;
						};

					}

					// Increment both pointers
					pDstBase += bufInc;
					pSrcBase += bufInc;

				}

				// Update pointer
				destBufferLocks[b] = pDstBase;
				srcBuf->unlock();
			}

			indexOffset += geom->geometry->vertexData->vertexCount;
		}

		// Unlock everything
		mIndexData->indexBuffer->unlock();
		for (b = 0; b < binds->getBufferCount(); ++b)
		{
			binds->getBuffer(b)->unlock();
		}

		// If we're dealing with stencil shadows, copy the position data from
		// the early half of the buffer to the latter part
		if (stencilShadows)
		{
			HardwareVertexBufferSharedPtr buf = binds->getBuffer(posBufferIdx);
			void* pSrc = buf->lock(HardwareBuffer::HBL_NORMAL);
			// Point dest at second half (remember vertexcount is original count)
			void* pDest = static_cast<uchar*>(pSrc) +
				buf->getVertexSize() * mVertexData->vertexCount;
			memcpy(pDest, pSrc, buf->getVertexSize() * mVertexData->vertexCount);
			buf->unlock();

			// Also set up hardware W buffer if appropriate
			RenderSystem* rend = Root::getSingleton().getRenderSystem();
			if (rend && rend->getCapabilities()->hasCapability(RSC_VERTEX_PROGRAM))
			{
				buf = HardwareBufferManager::getSingleton().createVertexBuffer(
					sizeof(float), mVertexData->vertexCount * 2,
					HardwareBuffer::HBU_STATIC_WRITE_ONLY, false);
				// Fill the first half with 1.0, second half with 0.0
				float *pW = static_cast<float*>(
					buf->lock(HardwareBuffer::HBL_DISCARD));
				size_t v;
				for (v = 0; v < mVertexData->vertexCount; ++v)
				{
					*pW++ = 1.0f;
				}
				for (v = 0; v < mVertexData->vertexCount; ++v)
				{
					*pW++ = 0.0f;
				}
				buf->unlock();
				mVertexData->hardwareShadowVolWBuffer = buf;
			}
		}

	}
	//--------------------------------------------------------------------------
	void StaticGeometry::GeometryBucket::dump(std::ofstream& of) const
	{
		of << "Geometry Bucket" << std::endl;
		of << "---------------" << std::endl;
		of << "Format string: " << mFormatString << std::endl;
		of << "Geometry items: " << mQueuedGeometry.size() << std::endl;
		of << "Vertex count: " << mVertexData->vertexCount << std::endl;
		of << "Index count: " << mIndexData->indexCount << std::endl;
		of << "---------------" << std::endl;

	}
	//--------------------------------------------------------------------------

}

