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

Copyright (c) 2000-2013 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#include "OgreBspLevel.h"
#include "OgreBspResourceManager.h"
#include "OgreException.h"
#include "OgreMaterial.h"
#include "OgreMaterialManager.h"
#include "OgreMovableObject.h"
#include "OgreSceneManager.h"
#include "OgrePatchSurface.h"
#include "OgreQuake3ShaderManager.h"
#include "OgreQuake3Shader.h"
#include "OgreMath.h"
#include "OgreStringVector.h"
#include "OgreStringConverter.h"
#include "OgreLogManager.h"
#include "OgreSceneManagerEnumerator.h"
#include "OgreTechnique.h"
#include "OgrePass.h"
#include "OgreTextureUnitState.h"
#include "OgreResourceGroupManager.h"

namespace Ogre {

    #define NUM_FACES_PER_PROGRESS_REPORT 100
    #define NUM_NODES_PER_PROGRESS_REPORT 50
    #define NUM_LEAVES_PER_PROGRESS_REPORT 50
    #define NUM_BRUSHES_PER_PROGRESS_REPORT 50

    //-----------------------------------------------------------------------
    BspLevel::BspLevel(ResourceManager* creator, const String& name, 
        ResourceHandle handle, const String& group, bool isManual, 
        ManualResourceLoader* loader)
      : Resource(creator, name, handle, group, isManual, loader), 
        mRootNode(0), 
        mVertexData(0), 
        mLeafFaceGroups(0),
        mFaceGroups(0), 
        mBrushes(0),
		mSkyEnabled(false)
    {
        mVisData.tableData = 0;

        if (createParamDictionary("BspLevel"))
        {
            // nothing
        }
    }

    //-----------------------------------------------------------------------
    BspLevel::~BspLevel()
    {
        // have to call this here reather than in Resource destructor
        // since calling virtual methods in base destructors causes crash
        unload(); 

    }

    //-----------------------------------------------------------------------
    void BspLevel::loadImpl()
    {
		mSkyEnabled = false;

        // Use Quake3 file loader
        Quake3Level q3;
        DataStreamPtr stream = 
			ResourceGroupManager::getSingleton().openResource(mName, 
				ResourceGroupManager::getSingleton().getWorldResourceGroupName());

        q3.loadFromStream(stream);

        loadQuake3Level(q3);

    }
	//-----------------------------------------------------------------------
	bool BspLevel::isSkyEnabled(void) const
	{
		return mSkyEnabled;
	}
	//-----------------------------------------------------------------------
	const String& BspLevel::getSkyMaterialName(void) const
	{
		return mSkyMaterial;
	}
	//-----------------------------------------------------------------------
	Real BspLevel::getSkyCurvature(void) const
	{
		return mSkyCurvature;
	}
    //-----------------------------------------------------------------------
    void BspLevel::load(DataStreamPtr& stream)
    {
        // Use Quake3 file loader
        Quake3Level q3;
        q3.loadFromStream(stream);

        loadQuake3Level(q3);

    }
    //-----------------------------------------------------------------------
    void BspLevel::unloadImpl()
    {
        if (mVertexData)
            OGRE_DELETE mVertexData;
        mIndexes.setNull();
        if (mFaceGroups)
            OGRE_DELETE_ARRAY_T(mFaceGroups, StaticFaceGroup, (size_t)mNumFaceGroups, MEMCATEGORY_GEOMETRY);
        if (mLeafFaceGroups)
            OGRE_FREE(mLeafFaceGroups, MEMCATEGORY_GEOMETRY);
        if (mRootNode)
            OGRE_DELETE [] mRootNode;
        if (mVisData.tableData)
            OGRE_FREE(mVisData.tableData, MEMCATEGORY_GEOMETRY);
        if (mBrushes)
			OGRE_DELETE_ARRAY_T(mBrushes, Brush, (size_t)mNumBrushes, MEMCATEGORY_GEOMETRY);

        mVertexData = 0;
        mRootNode = 0;
        mFaceGroups = 0;
        mLeafFaceGroups = 0;
        mBrushes = 0;
        mVisData.tableData = 0;
        for (PatchMap::iterator pi = mPatches.begin(); pi != mPatches.end(); ++pi)
        {
            OGRE_DELETE pi->second;
        }
        mPatches.clear();
    }
    //-----------------------------------------------------------------------
    size_t BspLevel::calculateLoadingStages(const String& levelName)
    {
        DataStreamPtr stream = 
            ResourceGroupManager::getSingleton().openResource(levelName, 
            ResourceGroupManager::getSingleton().getWorldResourceGroupName());
		return calculateLoadingStages(stream);
	}
    //-----------------------------------------------------------------------
    size_t BspLevel::calculateLoadingStages(DataStreamPtr& stream)
    {
        Quake3Level q3;

        // Load header only
        q3.loadHeaderFromStream(stream);

        // Ok, count up the things that we will report
        size_t stages = 0;

        // loadEntities (1 stage)
        ++stages;
        // extractLightmaps (external, 1 stage)
        ++stages;
        // initQuake3Patches
        ++stages;
        // vertex setup
        ++stages;
        // face setup
        ++stages;
        // patch building
        ++stages;
        // material setup
        // this is not strictly based on load, since we only know the number
        // of faces, not the number of materials
        // raise one event for every 50 faces, plus one at the end
        stages += (q3.mNumFaces / NUM_FACES_PER_PROGRESS_REPORT) + 1;
        // node setup
        stages += (q3.mNumNodes / NUM_NODES_PER_PROGRESS_REPORT) + 1;
        // brush setup
        stages += (q3.mNumBrushes / NUM_BRUSHES_PER_PROGRESS_REPORT) + 1;
        // leaf setup
        stages += (q3.mNumLeaves / NUM_LEAVES_PER_PROGRESS_REPORT) + 1;
        // vis
        ++stages;

        return stages;

    }
    //-----------------------------------------------------------------------
    void BspLevel::loadQuake3Level(const Quake3Level& q3lvl)
    {
        MaterialManager& mm = MaterialManager::getSingleton();
        ResourceGroupManager& rgm = ResourceGroupManager::getSingleton();

        rgm._notifyWorldGeometryStageStarted("Parsing entities");
        loadEntities(q3lvl);
        rgm._notifyWorldGeometryStageEnded();

        // Extract lightmaps into textures
        rgm._notifyWorldGeometryStageStarted("Extracting lightmaps");
        q3lvl.extractLightmaps();
        rgm._notifyWorldGeometryStageEnded();

        //-----------------------------------------------------------------------
        // Vertices
        //-----------------------------------------------------------------------
        // Allocate memory for vertices & copy
        mVertexData = OGRE_NEW VertexData();

        /// Create vertex declaration
        VertexDeclaration* decl = mVertexData->vertexDeclaration;
        size_t offset = 0;
        decl->addElement(0, offset, VET_FLOAT3, VES_POSITION);
        offset += VertexElement::getTypeSize(VET_FLOAT3);
        decl->addElement(0, offset, VET_FLOAT3, VES_NORMAL);
        offset += VertexElement::getTypeSize(VET_FLOAT3);
        decl->addElement(0, offset, VET_COLOUR, VES_DIFFUSE);
        offset += VertexElement::getTypeSize(VET_COLOUR);
        decl->addElement(0, offset, VET_FLOAT2, VES_TEXTURE_COORDINATES, 0);
        offset += VertexElement::getTypeSize(VET_FLOAT2);
        decl->addElement(0, offset, VET_FLOAT2, VES_TEXTURE_COORDINATES, 1);

        // Build initial patches - we need to know how big the vertex buffer needs to be
        // to accommodate the subdivision
        rgm._notifyWorldGeometryStageStarted("Initialising patches");
        initQuake3Patches(q3lvl, decl);
        rgm._notifyWorldGeometryStageEnded();

        /// Create the vertex buffer, allow space for patches
        rgm._notifyWorldGeometryStageStarted("Setting up vertex data");
        HardwareVertexBufferSharedPtr vbuf = HardwareBufferManager::getSingleton()
            .createVertexBuffer(
                sizeof(BspVertex), 
                q3lvl.mNumVertices + mPatchVertexCount, 
                HardwareBuffer::HBU_STATIC_WRITE_ONLY);
        //COPY static vertex data - Note that we can't just block-copy the vertex data because we have to reorder
        //    our vertex elements; this is to ensure compatibility with older cards when using
        //    hardware vertex buffers - Direct3D requires that the buffer format maps onto a
        //    FVF in those older drivers. 
        // Lock just the non-patch area for now
        BspVertex* pVert = static_cast<BspVertex*>(
            vbuf->lock(0, q3lvl.mNumVertices * sizeof(BspVertex), HardwareBuffer::HBL_DISCARD) );
        // Keep another base pointer for use later in patch building
        for (int v = 0; v < q3lvl.mNumVertices; ++v)
        {
            quakeVertexToBspVertex(&q3lvl.mVertices[v], pVert++);
        }
        vbuf->unlock();
        // Setup binding
        mVertexData->vertexBufferBinding->setBinding(0, vbuf);
        // Set other data
        mVertexData->vertexStart = 0;
        mVertexData->vertexCount = q3lvl.mNumVertices + mPatchVertexCount;
        rgm._notifyWorldGeometryStageEnded();

        //-----------------------------------------------------------------------
        // Faces
        // --------
        rgm._notifyWorldGeometryStageStarted("Setting up face data");
        mNumLeafFaceGroups = q3lvl.mNumLeafFaces;
        mLeafFaceGroups = OGRE_ALLOC_T(int, mNumLeafFaceGroups, MEMCATEGORY_GEOMETRY);
        memcpy(mLeafFaceGroups, q3lvl.mLeafFaces, sizeof(int)*mNumLeafFaceGroups);
        mNumFaceGroups = q3lvl.mNumFaces;
        mFaceGroups = OGRE_NEW_ARRAY_T(StaticFaceGroup, mNumFaceGroups, MEMCATEGORY_GEOMETRY);
        // Set up index buffer
        // NB Quake3 indexes are 32-bit
        // Copy the indexes into a software area for staging
        mNumIndexes = q3lvl.mNumElements + mPatchIndexCount;
        // Create an index buffer manually in system memory, allow space for patches
        mIndexes.bind(OGRE_NEW DefaultHardwareIndexBuffer(
            HardwareIndexBuffer::IT_32BIT, 
            mNumIndexes, 
            HardwareBuffer::HBU_DYNAMIC));
        // Write main indexes
        mIndexes->writeData(0, sizeof(unsigned int) * q3lvl.mNumElements, q3lvl.mElements, true);
        rgm._notifyWorldGeometryStageEnded();

        // now build patch information
        rgm._notifyWorldGeometryStageStarted("Building patches");
        buildQuake3Patches(q3lvl.mNumVertices, q3lvl.mNumElements);
        rgm._notifyWorldGeometryStageEnded();

        //-----------------------------------------------------------------------
        // Create materials for shaders
        //-----------------------------------------------------------------------
        // NB this only works for the 'default' shaders for now
        //  i.e. those that don't have a .shader script and thus default
        //  to just texture + lightmap
        // TODO: pre-parse all .shader files and create lookup for next stage (use ROGL shader_file_t)

        // Material names are shadername#lightmapnumber
        // This is because I like to define materials up front completely
        //  rather than combine lightmap and shader dynamically (it's
        //  more generic). It results in more materials, but they're small
        //  beer anyway. Texture duplication is prevented by infrastructure.
        // To do this I actually need to parse the faces since they have the
        //  shader/lightmap combo (lightmap number is not in the shader since
        //  it can be used with multiple lightmaps)
        String shaderName;
        int face;
        face = q3lvl.mNumFaces;
        ResourceHandle matHandle;
        String meshName;

        String resourceGroup = ResourceGroupManager::getSingleton().getWorldResourceGroupName();
        size_t progressCountdown = NUM_FACES_PER_PROGRESS_REPORT;
        size_t progressCount = 0;

        while(face--)
        {
            // Progress reporting
            if (progressCountdown == NUM_FACES_PER_PROGRESS_REPORT)
            {
                ++progressCount;
                StringUtil::StrStreamType str;
                str << "Loading materials (phase " << progressCount << ")"; 
                rgm._notifyWorldGeometryStageStarted(str.str());
            }
            else if (progressCountdown == 0)
            {
                // stage report
                rgm._notifyWorldGeometryStageEnded();
                progressCountdown = NUM_FACES_PER_PROGRESS_REPORT + 1; 

            }

            // Check to see if existing material
            // Format shader#lightmap
            int shadIdx = q3lvl.mFaces[face].shader;
			StringUtil::StrStreamType tmp;
			tmp << q3lvl.mShaders[shadIdx].name << "#" << q3lvl.mFaces[face].lm_texture;
			shaderName = tmp.str();

            MaterialPtr shadMat = MaterialManager::getSingleton().getByName(shaderName);
            if (shadMat.isNull())
            {
                // Build new material

                // Colour layer
                // NB no extension in Q3A(doh), have to try shader, .jpg, .tga
                String tryName = q3lvl.mShaders[shadIdx].name;
                // Try shader first
                Quake3Shader* pShad = Quake3ShaderManager::getSingleton().getByName(tryName);
                if (pShad)
                {
                    shadMat = pShad->createAsMaterial(q3lvl.mFaces[face].lm_texture);
					// Do skydome (use this material)
					if (pShad->skyDome)
					{
						mSkyEnabled = true;
						mSkyMaterial = shadMat->getName();
						mSkyCurvature = 20 - (pShad->cloudHeight / 256 * 18);
					}
                }
                else
                {
                    // No shader script, try default type texture
                    shadMat = mm.create(shaderName, resourceGroup);
                    Pass *shadPass = shadMat->getTechnique(0)->getPass(0);
                    // Try jpg
                    TextureUnitState* tex = 0;
                    if (ResourceGroupManager::getSingleton().resourceExists(resourceGroup, tryName + ".jpg"))
                    {
                        tex = shadPass->createTextureUnitState(tryName + ".jpg");
                    }
                    else if (ResourceGroupManager::getSingleton().resourceExists(resourceGroup, tryName + ".tga"))
                    {
                        tex = shadPass->createTextureUnitState(tryName + ".tga");
                    }

                    if (tex)
                    {
                        // Set replace on all first layer textures for now
                        tex->setColourOperation(LBO_REPLACE);
                        tex->setTextureAddressingMode(TextureUnitState::TAM_WRAP);
                    }

                    if (q3lvl.mFaces[face].lm_texture >= 0)
                    {
                        // Add lightmap, additive blending
						StringUtil::StrStreamType lightmapName;
                        lightmapName << "@lightmap" << q3lvl.mFaces[face].lm_texture;
                        tex = shadPass->createTextureUnitState(lightmapName.str());
                        // Blend
                        tex->setColourOperation(LBO_MODULATE);
                        // Use 2nd texture co-ordinate set
                        tex->setTextureCoordSet(1);
                        // Clamp
                        tex->setTextureAddressingMode(TextureUnitState::TAM_CLAMP);

                    }
                    // Set culling mode to none
                    shadMat->setCullingMode(CULL_NONE);
                    // No dynamic lighting
                    shadMat->setLightingEnabled(false);

                }
            }
            matHandle = shadMat->getHandle();
            shadMat->load();

            // Copy face data
            StaticFaceGroup* dest = &mFaceGroups[face];
            bsp_face_t* src = &q3lvl.mFaces[face];

            if (q3lvl.mShaders[src->shader].surface_flags & SURF_SKY)
            {
                dest->isSky = true;
            }
            else
            {
                dest->isSky = false;
            }


            dest->materialHandle = matHandle;
            dest->elementStart = src->elem_start;
            dest->numElements = src->elem_count;
            dest->numVertices = src->vert_count;
            dest->vertexStart = src->vert_start;
            if (src->type == BSP_FACETYPE_NORMAL)
            {
                dest->fType = FGT_FACE_LIST;
                // Assign plane
                dest->plane.normal = Vector3(src->normal[0], src->normal[1], src->normal[2]);
                dest->plane.d = -dest->plane.normal.dotProduct(
					Vector3(src->org[0], src->org[1], src->org[2]));

                // Don't rebase indexes here - Quake3 re-uses some indexes for multiple vertex
                // groups eg repeating small details have the same relative vertex data but
                // use the same index data.

            }
            else if (src->type == BSP_FACETYPE_PATCH)
            {
                // Seems to be some crap in the Q3 level where vertex count = 0 or num control points = 0?
                if (dest->numVertices == 0 || src->mesh_cp[0] == 0)
                {
                    dest->fType = FGT_UNKNOWN;
                }
                else
                {

                    // Set up patch surface
                    dest->fType = FGT_PATCH;
                    
                    // Locate the patch we already built
                    PatchMap::iterator p = mPatches.find(face);
                    if (p == mPatches.end())
                    {
                        OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR, "Patch not found from previous built state",
                        "BspLevel::loadQuake3Level");
                    }

                    dest->patchSurf = p->second;
                    
                }


            }
			else if (src->type == BSP_FACETYPE_MESH)
			{
				dest->fType = FGT_FACE_LIST;
				// Assign plane
				dest->plane.normal = Vector3(src->normal[0], src->normal[1], src->normal[2]);
				dest->plane.d = -dest->plane.normal.dotProduct(
					Vector3(src->org[0], src->org[1], src->org[2]));                
			}
			else
			{
				LogManager::getSingleton().logMessage("!!! Unknown Face Type !!!", LML_CRITICAL);
			}

            // progress reporting
            --progressCountdown;

        }
        // final stage report
        rgm._notifyWorldGeometryStageEnded();

        //-----------------------------------------------------------------------
        // Nodes
        //-----------------------------------------------------------------------
        // Allocate memory for all nodes (leaves and splitters)
        mNumNodes = q3lvl.mNumNodes + q3lvl.mNumLeaves;
        mNumLeaves = q3lvl.mNumLeaves;
        mLeafStart = q3lvl.mNumNodes;
        mRootNode = OGRE_NEW BspNode[mNumNodes];
        int i;
        // Convert nodes
        // In our array, first q3lvl.mNumNodes are non-leaf, others are leaves
        progressCountdown = NUM_NODES_PER_PROGRESS_REPORT;
        progressCount = 0;

        for (i = 0; i < q3lvl.mNumNodes; ++i)
        {
            // Progress reporting
            if (progressCountdown == NUM_NODES_PER_PROGRESS_REPORT)
            {
                ++progressCount;
                StringUtil::StrStreamType str;
                str << "Loading nodes (phase " << progressCount << ")"; 
                    rgm._notifyWorldGeometryStageStarted(str.str());
            }
            else if (progressCountdown == 0)
            {
                // stage report
                rgm._notifyWorldGeometryStageEnded();
                progressCountdown = NUM_NODES_PER_PROGRESS_REPORT + 1; 

            }

            BspNode* node = &mRootNode[i];
            bsp_node_t* q3node = &q3lvl.mNodes[i];

            // Set non-leaf
            node->mIsLeaf = false;
            // Set owner
            node->mOwner = this;
            // Set plane
            node->mSplitPlane.normal.x = q3lvl.mPlanes[q3node->plane].normal[0];
            node->mSplitPlane.normal.y = q3lvl.mPlanes[q3node->plane].normal[1];
            node->mSplitPlane.normal.z = q3lvl.mPlanes[q3node->plane].normal[2];
            node->mSplitPlane.d = -q3lvl.mPlanes[q3node->plane].dist;
            // Set bounding box
            node->mBounds.setMinimum(Vector3(&q3node->bbox[0]));
            node->mBounds.setMaximum(Vector3(&q3node->bbox[3]));
            // Set back pointer
            // Negative indexes in Quake3 mean leaves
            if (q3node->back < 0)
            {
                // Points to leaf, offset to leaf start and negate index
                node->mBack = &mRootNode[mLeafStart + (~(q3node->back))];

            }
            else
            {
                // Points to node
                node->mBack = &mRootNode[q3node->back];
            }
            // Set front pointer
            // Negative indexes in Quake3 mean leaves
            if (q3node->front < 0)
            {
                // Points to leaf, offset to leaf start and negate index
                node->mFront = &mRootNode[mLeafStart + (~(q3node->front))];

            }
            else
            {
                // Points to node
                node->mFront = &mRootNode[q3node->front];
            }

            --progressCountdown;


        }
        // final stage report
        rgm._notifyWorldGeometryStageEnded();

        //-----------------------------------------------------------------------
        // Brushes
        //-----------------------------------------------------------------------
        // Reserve enough memory for all brushes, solid or not (need to maintain indexes)
		mNumBrushes = q3lvl.mNumBrushes;
        mBrushes = OGRE_NEW_ARRAY_T(BspNode::Brush, mNumBrushes, MEMCATEGORY_GEOMETRY);
        progressCountdown = NUM_BRUSHES_PER_PROGRESS_REPORT;
        progressCount = 0;

        for (i = 0; i < q3lvl.mNumBrushes; ++i)
        {
            // Progress reporting
            if (progressCountdown == NUM_BRUSHES_PER_PROGRESS_REPORT)
            {
                ++progressCount;
                StringUtil::StrStreamType str;
                str << "Loading brushes (phase " << progressCount << ")"; 
                    rgm._notifyWorldGeometryStageStarted(str.str());
            }
            else if (progressCountdown == 0)
            {
                // stage report
                rgm._notifyWorldGeometryStageEnded();
                progressCountdown = NUM_BRUSHES_PER_PROGRESS_REPORT + 1; 

            }
            bsp_brush_t* q3brush = &q3lvl.mBrushes[i];

            // Create a new OGRE brush
            BspNode::Brush *pBrush = &(mBrushes[i]);
            int brushSideIdx, numBrushSides;
            numBrushSides = q3brush->numsides;
            brushSideIdx = q3brush->firstside;
            // Iterate over the sides and create plane for each
            while (numBrushSides--)
            {
                bsp_brushside_t* q3brushside = &q3lvl.mBrushSides[brushSideIdx];
                bsp_plane_t* q3brushplane = &q3lvl.mPlanes[q3brushside->planenum];
                // Notice how we normally invert Q3A plane distances, but here we do not
                // Because we want plane normals pointing out of solid brushes, not in
                Plane brushSide(
					Vector3(
						q3brushplane->normal[0], 
						q3brushplane->normal[1], 
						q3brushplane->normal[2]), 
					q3brushplane->dist);
                pBrush->planes.push_back(brushSide);
                ++brushSideIdx;
            }
            // Build world fragment
            pBrush->fragment.fragmentType = SceneQuery::WFT_PLANE_BOUNDED_REGION;
            pBrush->fragment.planes = &(pBrush->planes);

            --progressCountdown;

        }
        // final stage report
        rgm._notifyWorldGeometryStageEnded();



        //-----------------------------------------------------------------------
        // Leaves
        //-----------------------------------------------------------------------
        progressCountdown = NUM_LEAVES_PER_PROGRESS_REPORT;
        progressCount = 0;
        for (i = 0; i < q3lvl.mNumLeaves; ++i)
        {
            // Progress reporting
            if (progressCountdown == NUM_LEAVES_PER_PROGRESS_REPORT)
            {
                ++progressCount;
                StringUtil::StrStreamType str;
                str << "Loading leaves (phase " << progressCount << ")"; 
                    rgm._notifyWorldGeometryStageStarted(str.str());
            }
            else if (progressCountdown == 0)
            {
                // stage report
                rgm._notifyWorldGeometryStageEnded();
                progressCountdown = NUM_LEAVES_PER_PROGRESS_REPORT + 1; 

            }
            BspNode* node = &mRootNode[i + mLeafStart];
            bsp_leaf_t* q3leaf = &q3lvl.mLeaves[i];

            // Set leaf
            node->mIsLeaf = true;
            // Set owner
            node->mOwner = this;
            // Set bounding box
            node->mBounds.setMinimum(Vector3(&q3leaf->bbox[0]));
            node->mBounds.setMaximum(Vector3(&q3leaf->bbox[3]));
            // Set faces
            node->mFaceGroupStart = q3leaf->face_start;
            node->mNumFaceGroups = q3leaf->face_count;

            node->mVisCluster = q3leaf->cluster;

            // Load Brushes for this leaf
            int brushIdx, brushCount, realBrushIdx;
            brushCount = q3leaf->brush_count;
            brushIdx = q3leaf->brush_start;

            while(brushCount--)
            {
                realBrushIdx = q3lvl.mLeafBrushes[brushIdx];
                bsp_brush_t* q3brush = &q3lvl.mBrushes[realBrushIdx];
                // Only load solid ones, we don't care about any other types
                // Shader determines this
                bsp_shader_t* brushShader = &q3lvl.mShaders[q3brush->shaderIndex];
                if (brushShader->content_flags & CONTENTS_SOLID)
                {
                    // Get brush 
                    BspNode::Brush *pBrush = &(mBrushes[realBrushIdx]);
                    assert(pBrush->fragment.fragmentType == SceneQuery::WFT_PLANE_BOUNDED_REGION);
                    // Assign node pointer
                    node->mSolidBrushes.push_back(pBrush);
                }
                ++brushIdx;
            }

            --progressCountdown;

        }
        // final stage report
        rgm._notifyWorldGeometryStageEnded();



        // Vis - just copy
        // final stage report
        rgm._notifyWorldGeometryStageStarted("Copying Vis data");
        mVisData.numClusters = q3lvl.mVis->cluster_count;
        mVisData.rowLength = q3lvl.mVis->row_size;
        mVisData.tableData = OGRE_ALLOC_T(unsigned char, q3lvl.mVis->row_size * q3lvl.mVis->cluster_count, MEMCATEGORY_GEOMETRY);
        memcpy(mVisData.tableData, q3lvl.mVis->data, q3lvl.mVis->row_size * q3lvl.mVis->cluster_count);
        rgm._notifyWorldGeometryStageEnded();



    }

    //-----------------------------------------------------------------------
    void BspLevel::initQuake3Patches(const Quake3Level & q3lvl, VertexDeclaration* decl)
    {
        int face;

        mPatchVertexCount = 0;
        mPatchIndexCount = 0;

        // We're just building the patch here to get a hold on the size of the mesh
        // although we'll reuse this information later
        face = q3lvl.mNumFaces;
        while (face--)
        {

            bsp_face_t* src = &q3lvl.mFaces[face];

            if (src->type == BSP_FACETYPE_PATCH)
            {
                // Seems to be some crap in the Q3 level where vertex count = 0 or num control points = 0?
                if (src->vert_count == 0 || src->mesh_cp[0] == 0)
                {
                    continue;
                }
                PatchSurface* ps = OGRE_NEW PatchSurface();
                // Set up control points & format
                // Reuse the vertex declaration 
                // Copy control points into a buffer so we can convert their format
                BspVertex* pControlPoints = OGRE_ALLOC_T(BspVertex, src->vert_count, MEMCATEGORY_GEOMETRY);
                bsp_vertex_t* pSrc = q3lvl.mVertices + src->vert_start;
                for (int v = 0; v < src->vert_count; ++v)
                {
                    quakeVertexToBspVertex(pSrc++, &pControlPoints[v]);
                }
                // Define the surface, but don't build it yet (no vertex / index buffer)
                ps->defineSurface(
                    pControlPoints,
                    decl, 
                    src->mesh_cp[0],
                    src->mesh_cp[1],
                    PatchSurface::PST_BEZIER);
                // Get stats
                mPatchVertexCount += ps->getRequiredVertexCount();
                mPatchIndexCount += ps->getRequiredIndexCount();

                // Save the surface for later
                mPatches[face] = ps;
            }


        }

    }
    //-----------------------------------------------------------------------
    void BspLevel::buildQuake3Patches(size_t vertOffset, size_t indexOffset)
    {
        // Loop through the patches
        PatchMap::iterator i, iend;
        iend = mPatches.end();

        size_t currVertOffset = vertOffset;
        size_t currIndexOffset = indexOffset;

        HardwareVertexBufferSharedPtr vbuf = mVertexData->vertexBufferBinding->getBuffer(0);

        for (i = mPatches.begin(); i != iend; ++i)
        {
            PatchSurface* ps = i->second;
            
            ps->build(vbuf, currVertOffset, mIndexes, currIndexOffset);

            // No need for control points anymore
            BspVertex* pCP = static_cast<BspVertex*>(ps->getControlPointBuffer());
            OGRE_FREE(pCP, MEMCATEGORY_GEOMETRY);
            ps->notifyControlPointBufferDeallocated();

            currVertOffset += ps->getRequiredVertexCount();
            currIndexOffset += ps->getRequiredIndexCount();
        
        }
    }
    //-----------------------------------------------------------------------
    bool BspLevel::isLeafVisible(const BspNode* from, const BspNode* to) const
    {
        if (to->mVisCluster == -1)
            return false;
        if (from->mVisCluster == -1)
            // Camera outside world?
            return true;


        if (!from->isLeaf() || !to->isLeaf())
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
                "Both nodes must be leaf nodes for visibility testing.",
                "BspLevel::isLeafVisible");

        // Use PVS to determine visibility

        /*
        // In wordier terms, the fairly cryptic (but fast) version is doing this:
        //   Could make it a macro for even more speed?

        // Row offset = from cluster number * row size
        int offset = from->mVisCluster*mVisData.rowLength;

        // Column offset (in bytes) = to cluster number divided by 8 (since 8 bits per bytes)
        offset += to->mVisCluster >> 3;

        // Get the right bit within the byte, i.e. bitwise 'and' with bit at remainder position
        int result = *(mVisData.tableData + offset) & (1 << (to->mVisCluster & 7));

        return (result != 0);
        */

        //return ((*(mVisData.tableData + from->mVisCluster * mVisData.rowLength +
        //           ((to->mVisCluster)>>3)) & (1 << ((to->mVisCluster) & 7))) != 0);

        return (*(mVisData.tableData + from->mVisCluster*mVisData.rowLength +
                   ((to->mVisCluster)>>3)) & (1 << ((to->mVisCluster) & 7))) != 0;

    }
    //-----------------------------------------------------------------------
    const BspNode* BspLevel::getRootNode(void)
    {
        return mRootNode;
    }
    //-----------------------------------------------------------------------
    BspNode* BspLevel::findLeaf(const Vector3& point) const
    {
        BspNode* node = mRootNode;

        while (!node->isLeaf())
        {
            node = node->getNextNode(point);
        }

        return node;

    }
    //-----------------------------------------------------------------------
    void BspLevel::loadEntities(const Quake3Level& q3lvl)
    {
        char* strEnt;
        String line;
        StringVector vecparams;
        Vector3 origin = Vector3::ZERO;
        Radian angle ( 0 );
        size_t pos;
        char* lineend;
        bool isPlayerStart;

        isPlayerStart = false;
        strEnt = (char*)q3lvl.mEntities;

        lineend = strchr(strEnt, '\n');
        while (lineend != 0)
        {
            *lineend = '\0';
            line = strEnt;
            strEnt = lineend+1;
            StringUtil::trim(line);
            if (line.length() > 0)
            {
                StringUtil::toLowerCase(line);
                // Remove quotes
				while( ( pos = line.find("\"",0) ) != String::npos )
                {
                    line = line.substr(0,pos) + line.substr(pos+1,line.length()-(pos+1));
                }
                vecparams = StringUtil::split(line);
                StringVector::iterator params = vecparams.begin();

                if (params[0] == "origin")
                {
                    origin.x = static_cast<Real>(atof(params[1].c_str()));
                    origin.y = static_cast<Real>(atof(params[2].c_str()));
                    origin.z = static_cast<Real>(atof(params[3].c_str()));
                }
                if (params[0] == "angle")
                {
                    angle = Degree(static_cast<Real>(atof(params[1].c_str())));
                }
                if (params[0] == "classname" && params[1] == "info_player_deathmatch")
                {
                    isPlayerStart = true;
                }
                if (params[0] == "}")
                {
                    if (isPlayerStart)
                    {
                        // Save player start
                        ViewPoint vp;
                        vp.position = origin;
                        vp.orientation.FromAngleAxis(angle, Vector3::UNIT_Z);
                        mPlayerStarts.push_back(vp);
                    }
                    isPlayerStart = false;
                }
            }

            lineend = strchr(strEnt, '\n');
        }


    }
    //-----------------------------------------------------------------------
    void BspLevel::_notifyObjectMoved(const MovableObject* mov, 
            const Vector3& pos)
    {

        // Locate any current nodes the object is supposed to be attached to
        MovableToNodeMap::iterator i = mMovableToNodeMap.find(mov);
        if (i != mMovableToNodeMap.end())
        {
			list<BspNode*>::type::iterator nodeit, nodeitend;
            nodeitend = i->second.end();
            for (nodeit = i->second.begin(); nodeit != nodeitend; ++nodeit)
            {
                // Tell each node
                (*nodeit)->_removeMovable(mov);
            }
            // Clear the existing list of nodes because we'll reevaluate it
            i->second.clear();
        }

        tagNodesWithMovable(mRootNode, mov, pos);
    }
    //-----------------------------------------------------------------------
    void BspLevel::tagNodesWithMovable(BspNode* node, const MovableObject* mov,
        const Vector3& pos)
    {
        if (node->isLeaf())
        {
            // Add to movable->node map
            // Insert all the time, will get current if already there
            std::pair<MovableToNodeMap::iterator, bool> p = 
                mMovableToNodeMap.insert(
				MovableToNodeMap::value_type(mov, list<BspNode*>::type()));

            p.first->second.push_back(node);

            // Add movable to node
            node->_addMovable(mov);

        }
        else
        {
            // Find distance to dividing plane
            Real dist = node->getDistance(pos);
            if (Math::Abs(dist) < mov->getBoundingRadius())
            {
                // Bounding sphere crosses the plane, do both
                tagNodesWithMovable(node->getBack(), mov, pos);
                tagNodesWithMovable(node->getFront(), mov, pos);
            }
            else if (dist < 0)
            {    //-----------------------------------------------------------------------

                // Do back
                tagNodesWithMovable(node->getBack(), mov, pos);
            }
            else
            {
                // Do front
                tagNodesWithMovable(node->getFront(), mov, pos);
            }
        }
    }
    //-----------------------------------------------------------------------
	void BspLevel::_notifyObjectDetached(const MovableObject* mov)	
	{
        // Locate any current nodes the object is supposed to be attached to
        MovableToNodeMap::iterator i = mMovableToNodeMap.find(mov);
        if (i != mMovableToNodeMap.end())
        {
			list<BspNode*>::type::iterator nodeit, nodeitend;
            nodeitend = i->second.end();
            for (nodeit = i->second.begin(); nodeit != nodeitend; ++nodeit)
            {
                // Tell each node
                (*nodeit)->_removeMovable(mov);
            }
            // delete the entry for this MovableObject
            mMovableToNodeMap.erase(i);
        }
	}
    //-----------------------------------------------------------------------
    void BspLevel::quakeVertexToBspVertex(const bsp_vertex_t* src, BspVertex* dest)
    {
        memcpy(dest->position, src->point, sizeof(float) * 3);
        memcpy(dest->normal, src->normal,  sizeof(float) * 3);
        dest->colour = src->color;
        dest->texcoords[0]  = src->texture[0];
        dest->texcoords[1]  = src->texture[1];
        dest->lightmap[0]  = src->lightmap[0];
        dest->lightmap[1]  = src->lightmap[1];
    }
    //-----------------------------------------------------------------------
    size_t BspLevel::calculateSize(void) const
    {
        return 0; // TODO
    }
}
