C++ ogre::HardwareIndexBufferSharedPtr类代码示例

	void IndexBuffer::AddFromIndexData(Ogre::IndexData* indexData, const unsigned int offset)
	{
		// Get vertex count
		const unsigned int addedCount = indexData->indexCount;

		if(_reserved < _size + addedCount)
		{
			Reserve(_size + addedCount);
		}

		Ogre::HardwareIndexBufferSharedPtr hardwareBuffer = indexData->indexBuffer;
		const bool use32bitindexes = (hardwareBuffer->getType() == Ogre::HardwareIndexBuffer::IT_32BIT);

		if (use32bitindexes) 
		{
			const unsigned int* curIndex = static_cast<unsigned int*>
				(hardwareBuffer->lock(Ogre::HardwareBuffer::HBL_READ_ONLY));
			for(unsigned int k = 0; k < addedCount; ++k)
			{
				_buffer.push_back(offset + (*curIndex++));
			}
		}
		else
		{
			const unsigned short* curIndex = static_cast<unsigned short*>
				(hardwareBuffer->lock(Ogre::HardwareBuffer::HBL_READ_ONLY));
			for(unsigned int k = 0; k < addedCount; ++k)
			{
				_buffer.push_back(offset + static_cast<unsigned int>(*curIndex++));
			}
		}
		_size = _buffer.size();
		hardwareBuffer->unlock();
	}

void ESKOgre::createFakeEntity(Ogre::SceneManager *mSceneMgr) {
	Ogre::MeshPtr msh = Ogre::MeshManager::getSingleton().createManual(name + "_skeleton", XENOVIEWER_RESOURCE_GROUP);
	msh->setSkeletonName(name);

	Ogre::SubMesh* sub = msh->createSubMesh();
	const size_t nVertices = 3;
	const size_t nVertCount = 3;
	const size_t vbufCount = nVertCount*nVertices;
	float *vertices = (float *)malloc(sizeof(float)*vbufCount);

	for (size_t i = 0; i < nVertices; i++) {
		vertices[i*nVertCount] = 0.0;
		vertices[i*nVertCount + 1] = 0.0;
		vertices[i*nVertCount + 2] = 0.0;
	}

	const size_t ibufCount = 3;
	unsigned short *faces = (unsigned short *)malloc(sizeof(unsigned short) * ibufCount);

	for (size_t i = 0; i < ibufCount; i++) {
		faces[i] = i;
	}

	msh->sharedVertexData = new Ogre::VertexData();
	msh->sharedVertexData->vertexCount = nVertices;

	Ogre::VertexDeclaration* decl = msh->sharedVertexData->vertexDeclaration;
	size_t offset = 0;

	decl->addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
	offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);

	Ogre::HardwareVertexBufferSharedPtr vbuf = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(offset, msh->sharedVertexData->vertexCount, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
	vbuf->writeData(0, vbuf->getSizeInBytes(), vertices, true);
	Ogre::VertexBufferBinding* bind = msh->sharedVertexData->vertexBufferBinding;
	bind->setBinding(0, vbuf);
	Ogre::HardwareIndexBufferSharedPtr ibuf = Ogre::HardwareBufferManager::getSingleton().createIndexBuffer(Ogre::HardwareIndexBuffer::IT_16BIT, ibufCount, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
	ibuf->writeData(0, ibuf->getSizeInBytes(), faces, true);
	sub->useSharedVertices = true;
	sub->indexData->indexBuffer = ibuf;
	sub->indexData->indexCount = ibufCount;
	sub->indexData->indexStart = 0;

	msh->_setBounds(Ogre::AxisAlignedBox(-100, -100, -100, 100, 100, 100));
	msh->_setBoundingSphereRadius(100);
	msh->load();

	free(faces);
	free(vertices);

	skeleton_entity = mSceneMgr->createEntity(name + "_skeleton");
	skeleton_node = mSceneMgr->getRootSceneNode()->createChildSceneNode();
	skeleton_node->attachObject(skeleton_entity);
	skeleton_node->setVisible(false);
}

void processIndexData(IndexData* indexData)
{
	if (!mFlipVertexWinding)
	{
		// Nothing to do.
		return;
	}

	if (indexData->indexCount % 3 != 0)
	{
        printf("Index number is not a multiple of 3, no vertex winding flipping possible. Skipped.");
        return;
	}

	//print("Flipping index order for vertex winding flipping.", V_HIGH);
	Ogre::HardwareIndexBufferSharedPtr buffer = indexData->indexBuffer;
	unsigned char* data = static_cast<unsigned char*>(buffer->lock(Ogre::HardwareBuffer::HBL_READ_ONLY));

	if(buffer->getType() == Ogre::HardwareIndexBuffer::IT_16BIT)
	{
		// 16 bit
		//print("using 16bit indices", V_HIGH);

		for (size_t i = 0; i < indexData->indexCount; i+=3)
		{
			Ogre::uint16 * i0 = (Ogre::uint16*)(data+0 * buffer->getIndexSize());
			Ogre::uint16* i2 = (Ogre::uint16*)(data+2 * buffer->getIndexSize());

			// flip
			Ogre::uint16 tmp = *i0;
			*i0 = *i2;
			*i2 = tmp;

			data += 3 * buffer->getIndexSize();
		}
	}
	else
	{
		// 32 bit
		//print("using 32bit indices", V_HIGH);

		for (size_t i = 0; i < indexData->indexCount; i+=3)
		{
			Ogre::uint32* i0 = (Ogre::uint32*)(data+0 * buffer->getIndexSize());
			Ogre::uint32* i2 = (Ogre::uint32*)(data+2 * buffer->getIndexSize());

			// flip
			Ogre::uint32 tmp = *i0;
			*i0 = *i2;
			*i2 = tmp;

			data += 3 * buffer->getIndexSize();
		}
	}

	buffer->unlock();
}

Ogre::SubMesh *EMDOgre::createOgreSubmesh(EMDTriangles *triangles, Ogre::MeshPtr mesh) {
	Ogre::SubMesh *sub = mesh->createSubMesh();
	const size_t ibufCount = triangles->faces.size();
	unsigned short *faces = (unsigned short *)malloc(sizeof(unsigned short) * ibufCount);
	for (size_t i = 0; i<ibufCount; i++) {
		faces[i] = triangles->faces[i];
	}

	Ogre::HardwareIndexBufferSharedPtr ibuf = Ogre::HardwareBufferManager::getSingleton().createIndexBuffer(Ogre::HardwareIndexBuffer::IT_16BIT, ibufCount, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
	ibuf->writeData(0, ibuf->getSizeInBytes(), faces, true);
	sub->useSharedVertices = true;
	sub->indexData->indexBuffer = ibuf;
	sub->indexData->indexCount = ibufCount;
	sub->indexData->indexStart = 0;
	free(faces);
	return sub;
}

	//------------------------------------------------------------------------------------------------
	void VertexIndexToShape::addIndexData(Ogre::IndexData *data, const unsigned int offset)
	{
		const unsigned int prev_size = mIndexCount;
		mIndexCount += (unsigned int)data->indexCount;

		unsigned int* tmp_ind = new unsigned int[mIndexCount];
		if (mIndexBuffer)
		{
			memcpy (tmp_ind, mIndexBuffer, sizeof(unsigned int) * prev_size);
			delete[] mIndexBuffer;
		}
		mIndexBuffer = tmp_ind;

		const unsigned int numTris = (unsigned int) data->indexCount / 3;
		Ogre::HardwareIndexBufferSharedPtr ibuf = data->indexBuffer;
		const bool use32bitindexes = (ibuf->getType() == Ogre::HardwareIndexBuffer::IT_32BIT);
		unsigned int index_offset = prev_size;

		if (use32bitindexes)
		{
			const unsigned int* pInt = static_cast<unsigned int*>(ibuf->lock(Ogre::HardwareBuffer::HBL_READ_ONLY));
			for(unsigned int k = 0; k < numTris; ++k)
			{
				mIndexBuffer[index_offset ++] = offset + *pInt++;
				mIndexBuffer[index_offset ++] = offset + *pInt++;
				mIndexBuffer[index_offset ++] = offset + *pInt++;
			}
			ibuf->unlock();
		}
		else
		{
			const unsigned short* pShort = static_cast<unsigned short*>(ibuf->lock(Ogre::HardwareBuffer::HBL_READ_ONLY));
			for(unsigned int k = 0; k < numTris; ++k)
			{
				mIndexBuffer[index_offset ++] = offset + static_cast<unsigned int> (*pShort++);
				mIndexBuffer[index_offset ++] = offset + static_cast<unsigned int> (*pShort++);
				mIndexBuffer[index_offset ++] = offset + static_cast<unsigned int> (*pShort++);
			}
			ibuf->unlock();
		}

	}

void GPUBillboardSet::createVertexDataForVertexShaderOnly(const std::vector<PhotoSynth::Vertex>& vertices)
{
	// Setup render operation
	mRenderOp.operationType = Ogre::RenderOperation::OT_TRIANGLE_LIST; 
	mRenderOp.vertexData = OGRE_NEW Ogre::VertexData();
	mRenderOp.vertexData->vertexCount = vertices.size() * 4; 
	mRenderOp.vertexData->vertexStart = 0; 
	mRenderOp.useIndexes = true; 
	mRenderOp.indexData = OGRE_NEW Ogre::IndexData();
	mRenderOp.indexData->indexCount = vertices.size() * 6;
	mRenderOp.indexData->indexStart = 0;

	// Vertex format declaration
	unsigned short sourceBufferIdx = 0;
	Ogre::VertexDeclaration* decl = mRenderOp.vertexData->vertexDeclaration;
    size_t currOffset = 0;
	decl->addElement(sourceBufferIdx, currOffset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
	currOffset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
	decl->addElement(sourceBufferIdx, currOffset, Ogre::VET_COLOUR, Ogre::VES_DIFFUSE);
	currOffset += Ogre::VertexElement::getTypeSize(Ogre::VET_COLOUR);
	decl->addElement(sourceBufferIdx, currOffset, Ogre::VET_FLOAT2, Ogre::VES_TEXTURE_COORDINATES, 0);
	currOffset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT2);

	// Create vertex buffer
    Ogre::HardwareVertexBufferSharedPtr vbuf = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(
		decl->getVertexSize(sourceBufferIdx),
        mRenderOp.vertexData->vertexCount,
        Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);

    // Bind vertex buffer
    Ogre::VertexBufferBinding* bind = mRenderOp.vertexData->vertexBufferBinding;
	bind->setBinding(sourceBufferIdx, vbuf);

	// Fill vertex buffer (see http://www.ogre3d.org/docs/manual/manual_59.html#SEC287)
	Ogre::RenderSystem* renderSystem = Ogre::Root::getSingletonPtr()->getRenderSystem();
	unsigned char* pVert = static_cast<unsigned char*>(vbuf->lock(Ogre::HardwareBuffer::HBL_DISCARD));
	Ogre::Real* pReal;
	Ogre::RGBA* pRGBA;
	Ogre::VertexDeclaration::VertexElementList elems = decl->findElementsBySource(sourceBufferIdx);
	Ogre::VertexDeclaration::VertexElementList::iterator itr;

	const Ogre::Vector2 uvs[4] = {	Ogre::Vector2( -1.f, 1.f ),
									Ogre::Vector2( -1.f, -1.f ),
									Ogre::Vector2( 1.f, -1.f ),
									Ogre::Vector2( 1.f, 1.f ) };
	for (unsigned int i=0; i<vertices.size(); ++i )
	{
		const PhotoSynth::Vertex& vertex = vertices[i];
		for ( unsigned int j=0; j<4; j++ )
		{
			for (itr=elems.begin(); itr!=elems.end(); ++itr)
			{
				Ogre::VertexElement& elem = *itr;
				if (elem.getSemantic() == Ogre::VES_POSITION)
				{
					elem.baseVertexPointerToElement(pVert, &pReal);
					*pReal = vertex.position.x; *pReal++;
					*pReal = vertex.position.y; *pReal++;
					*pReal = vertex.position.z; *pReal++;
				}
				else if (elem.getSemantic() == Ogre::VES_DIFFUSE)
				{
					elem.baseVertexPointerToElement(pVert, &pRGBA);
					renderSystem->convertColourValue(vertex.color, pRGBA);
				}
				else if (elem.getSemantic() == Ogre::VES_TEXTURE_COORDINATES && elem.getIndex() == 0)
				{
					elem.baseVertexPointerToElement(pVert, &pReal);
					*pReal = uvs[j].x; *pReal++;
					*pReal = uvs[j].y; *pReal++;
				}
			}
			// Go to next vertex 
			pVert += vbuf->getVertexSize();
		}
	}
	vbuf->unlock();

	// Create index buffer
	if (mRenderOp.indexData->indexCount>=65536)
	{
		Ogre::HardwareIndexBufferSharedPtr ibuf = Ogre::HardwareBufferManager::getSingleton().createIndexBuffer( 
			Ogre::HardwareIndexBuffer::IT_32BIT, 
			mRenderOp.indexData->indexCount, 
			Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY, false);

		mRenderOp.indexData->indexBuffer = ibuf;
		Ogre::uint32* indices = static_cast<Ogre::uint32*>(ibuf->lock( Ogre::HardwareBuffer::HBL_DISCARD));

		Ogre::uint32 indexFirstVertex = 0;
		const Ogre::uint32 inds[6] = {	0, 1, 2, 3, 0, 2 };
		for (unsigned int i=0; i<vertices.size(); ++i)
		{
			for (unsigned int j=0; j<6; ++j)
			{
				*indices = indexFirstVertex + inds[j];
				indices++;
			}
			indexFirstVertex +=4;
		}
//.........这里部分代码省略.........

bool ShaderParticleRenderer::allocateBuffers(size_t iNumParticles)
{
    // prepare vertex declaration
    if (mVertexData->vertexDeclaration->getElementCount() == 0) {
        VertexDeclaration* pDecl = mVertexData->vertexDeclaration;
        size_t ofs = 0;
        ofs += pDecl->addElement(0, ofs, VET_FLOAT4, VES_POSITION).getSize();				// position
        if (mVertexFormatColour)
            ofs += pDecl->addElement(0, ofs, VET_FLOAT4, VES_DIFFUSE).getSize();			// diffuse colour

        // other data are stored in vertex as texture coordinates
        ushort ix = 0;
        if (mVertexFormatTexture)
            ofs += pDecl->addElement(0, ofs, VET_FLOAT2, VES_TEXTURE_COORDINATES, ix++).getSize();	// general texture coord

        if (mVertexFormatSize)
            ofs += pDecl->addElement(0, ofs, VET_FLOAT2, VES_TEXTURE_COORDINATES, ix++).getSize();	// particle size

        if (mVertexFormatRotation || mVertexFormatRotationSpeed) {
            if (mVertexFormatRotation && mVertexFormatRotationSpeed)
                ofs += pDecl->addElement(0, ofs, VET_FLOAT2, VES_TEXTURE_COORDINATES, ix++).getSize();	// current rotation and rotation speed
            else
                ofs += pDecl->addElement(0, ofs, VET_FLOAT1, VES_TEXTURE_COORDINATES, ix++).getSize();	// current rotation or rotation speed
        }

        if (mVertexFormatDirection)
            ofs += pDecl->addElement(0, ofs, VET_FLOAT3, VES_TEXTURE_COORDINATES, ix++).getSize();	// particle direction (as speed)

        // add packed times
        size_t iNumTimes = 0;
        if (mVertexFormatTTL) iNumTimes++;
        if (mVertexFormatTotalTTL) iNumTimes++;
        if (mVertexFormatTimeFragment) iNumTimes++;
        if (mVertexFormatTimeFragmentInv) iNumTimes++;
        switch(iNumTimes) {
            case 1:
                ofs += pDecl->addElement(0, ofs, VET_FLOAT1, VES_TEXTURE_COORDINATES, ix++).getSize();
                break;
            case 2:
                ofs += pDecl->addElement(0, ofs, VET_FLOAT2, VES_TEXTURE_COORDINATES, ix++).getSize();
                break;
            case 3:
                ofs += pDecl->addElement(0, ofs, VET_FLOAT3, VES_TEXTURE_COORDINATES, ix++).getSize();
                break;
            case 4:
                ofs += pDecl->addElement(0, ofs, VET_FLOAT4, VES_TEXTURE_COORDINATES, ix++).getSize();
                break;
        }

        // add custom parameters
        ofs += pDecl->addElement(0, ofs, VET_FLOAT4, VES_TEXTURE_COORDINATES, ix++).getSize();
        assert(ix <= 8);

        // cache vertex size
        mVertexSize = pDecl->getVertexSize(0);
    }

    Ogre::HardwareVertexBufferSharedPtr pVB;
    if (mVertexData->vertexBufferBinding->isBufferBound(0))
        pVB = mVertexData->vertexBufferBinding->getBuffer(0);

    // prepare vertex buffer
    if (pVB.isNull() || pVB->getNumVertices() < iNumParticles * 4) {
        assert(iNumParticles * 4 < 65536); // we are using 16bit index buffer
        pVB = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(mVertexSize, 4 * iNumParticles, Ogre::HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY_DISCARDABLE);
        if (pVB.isNull())
            return false;

        mVertexData->vertexBufferBinding->setBinding(0, pVB);
    }

    // prepare index buffer
    Ogre::HardwareIndexBufferSharedPtr pIB = mIndexData->indexBuffer;
    if (pIB.isNull() || pIB->getNumIndexes() < iNumParticles * 6) {
        pIB = Ogre::HardwareBufferManager::getSingleton().createIndexBuffer(Ogre::HardwareIndexBuffer::IT_16BIT, iNumParticles * 6, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
        if (pIB.isNull())
            return false;

        mIndexData->indexBuffer = pIB;

        // fill
        Ogre::uint16* pDataIB = reinterpret_cast<Ogre::uint16*>(pIB->lock(Ogre::HardwareBuffer::HBL_NORMAL));
        for (Ogre::uint16 k=0; k<static_cast<Ogre::uint16>(iNumParticles); ++k) {
            pDataIB[0] = k*4 + 0;
            pDataIB[1] = k*4 + 1;
            pDataIB[2] = k*4 + 2;

            pDataIB[3] = k*4 + 0;
            pDataIB[4] = k*4 + 2;
            pDataIB[5] = k*4 + 3;
            pDataIB += 6;
        }
        pIB->unlock();
    }

    return true;
}

void Renderer::FindClosestPolygon(Ogre::Entity* entity, float& closestDistance,
                                       Ogre::Vector3& position, Ogre::Vector3& normal)
{
    closestDistance = std::numeric_limits<float>::max();    // default value (means
                                                            // nothing detected)

    // Get transformation
    Ogre::SceneNode* parentNode = entity->getParentSceneNode();
    Ogre::Vector3 parentPos;
    Ogre::Quaternion parentOrientation;
    Ogre::Vector3 parentScale;
    if (parentNode)
    {
        parentPos = parentNode->_getDerivedPosition();
        parentOrientation = parentNode->_getDerivedOrientation();
        parentScale = parentNode->_getDerivedScale();
    }
    else
    {
        parentPos = Ogre::Vector3::ZERO;
        parentOrientation = Ogre::Quaternion::IDENTITY;
        parentScale = Ogre::Vector3::UNIT_SCALE;
    }

    // Handle animated entities
    bool isAnimated = entity->hasSkeleton();
    if (isAnimated)
    {
        entity->addSoftwareAnimationRequest(false);
        entity->_updateAnimation();
    }

    // Loop through each submesh
    Ogre::MeshPtr mesh = entity->getMesh();
    for (uint i = 0; i < mesh->getNumSubMeshes(); ++i)
    {
        Ogre::SubMesh* subMesh = mesh->getSubMesh(i);

        // Ignore anything that isn't a triangle List
        if (subMesh->operationType != Ogre::RenderOperation::OT_TRIANGLE_LIST)
            continue;

        // Get the vertex data
        Ogre::VertexData* vertexData;
        if (subMesh->useSharedVertices)
        {
            if (isAnimated)
                vertexData = entity->_getSkelAnimVertexData();
            else
                vertexData = mesh->sharedVertexData;
        }
        else
        {
            if (isAnimated)
                vertexData = entity->getSubEntity(i)->_getSkelAnimVertexData();
            else
                vertexData = subMesh->vertexData;
        }

        // Get the size of one vertex
        const Ogre::VertexElement* posEl =
            vertexData->vertexDeclaration->findElementBySemantic(Ogre::VES_POSITION);
        Ogre::HardwareVertexBufferSharedPtr vBuff =
            vertexData->vertexBufferBinding->getBuffer(posEl->getSource());
        uint vertexSize = vBuff->getVertexSize();

        // Save pointer to first vertex
        short* pVertex = (short*)vBuff->lock(Ogre::HardwareBuffer::HBL_READ_ONLY);
        short* pStartVertex = pVertex;

        // Get the index buffer
        // If it is null then skip as it must be a point cloud
        Ogre::HardwareIndexBufferSharedPtr iBuff = subMesh->indexData->indexBuffer;

        if (iBuff.isNull())
            continue;

        uint* pLong = (uint*)iBuff->lock(Ogre::HardwareBuffer::HBL_READ_ONLY);
        uint16_t* pShort = (uint16_t*)pLong;

        // Look through each vertex and check each triangle with the ray
        Ogre::Vector3 vertexPos;
        Ogre::Vector3 vertex1;
        Ogre::Vector3 vertex2;
        float* pReal;
        uint index;
        for (uint k = 0; k < subMesh->indexData->indexCount; k++)
        {
            // Read index value
            if (iBuff->getType() == Ogre::HardwareIndexBuffer::IT_32BIT)    // if 32bit indexes
            {
                index = (uint)pLong[k];
            }
            else
            {
                index = (uint)pShort[k];
            }

            // Read referenced vertex
            pVertex = pStartVertex + (vertexSize * index);              // calculate pointer
//.........这里部分代码省略.........

// Get the mesh information for the given mesh.
// Code found on this forum link: http://www.ogre3d.org/wiki/index.php/RetrieveVertexData
void CollisionTools::GetMeshInformation(const Ogre::MeshPtr mesh,
                                size_t &vertex_count,
                                Ogre::Vector3* &vertices,
                                size_t &index_count,
                                Ogre::uint32* &indices,
                                const Ogre::Vector3 &position,
                                const Ogre::Quaternion &orient,
                                const Ogre::Vector3 &scale)
{
    bool added_shared = false;
    size_t current_offset = 0;
    size_t shared_offset = 0;
    size_t next_offset = 0;
    size_t index_offset = 0;

    vertex_count = index_count = 0;

    // Calculate how many vertices and indices we're going to need
    for (unsigned short i = 0; i < mesh->getNumSubMeshes(); ++i)
    {
        Ogre::SubMesh* submesh = mesh->getSubMesh( i );

        // We only need to add the shared vertices once
        if(submesh->useSharedVertices)
        {
            if( !added_shared )
            {
                vertex_count += mesh->sharedVertexData->vertexCount;
                added_shared = true;
            }
        }
        else
        {
            vertex_count += submesh->vertexData->vertexCount;
        }

        // Add the indices
        index_count += submesh->indexData->indexCount;
    }


    // Allocate space for the vertices and indices
    vertices = new Ogre::Vector3[vertex_count];
    indices = new Ogre::uint32[index_count];

    added_shared = false;

    // Run through the submeshes again, adding the data into the arrays
    for ( unsigned short i = 0; i < mesh->getNumSubMeshes(); ++i)
    {
        Ogre::SubMesh* submesh = mesh->getSubMesh(i);

        Ogre::VertexData* vertex_data = submesh->useSharedVertices ? mesh->sharedVertexData : submesh->vertexData;

        if((!submesh->useSharedVertices)||(submesh->useSharedVertices && !added_shared))
        {
            if(submesh->useSharedVertices)
            {
                added_shared = true;
                shared_offset = current_offset;
            }

            const Ogre::VertexElement* posElem =
                vertex_data->vertexDeclaration->findElementBySemantic(Ogre::VES_POSITION);

            Ogre::HardwareVertexBufferSharedPtr vbuf =
                vertex_data->vertexBufferBinding->getBuffer(posElem->getSource());

            unsigned char* vertex =
                static_cast<unsigned char*>(vbuf->lock(Ogre::HardwareBuffer::HBL_READ_ONLY));

            // There is _no_ baseVertexPointerToElement() which takes an Ogre::Ogre::Real or a double
            //  as second argument. So make it float, to avoid trouble when Ogre::Ogre::Real will
            //  be comiled/typedefed as double:
            //      Ogre::Ogre::Real* pOgre::Real;
            float* pReal;

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

                Ogre::Vector3 pt(pReal[0], pReal[1], pReal[2]);

                vertices[current_offset + j] = (orient * (pt * scale)) + position;
            }

            vbuf->unlock();
            next_offset += vertex_data->vertexCount;
        }


        Ogre::IndexData* index_data = submesh->indexData;
        size_t numTris = index_data->indexCount / 3;
        Ogre::HardwareIndexBufferSharedPtr ibuf = index_data->indexBuffer;

        bool use32bitindexes = (ibuf->getType() == Ogre::HardwareIndexBuffer::IT_32BIT);

        Ogre::uint32*  pLong = static_cast<Ogre::uint32*>(ibuf->lock(Ogre::HardwareBuffer::HBL_READ_ONLY));
//.........这里部分代码省略.........

//.........这里部分代码省略.........
            Ogre::Matrix4 mat4 = shape->getWorldTransform();
            for(size_t i = 0;i < srcVerts.size();i++)
            {
                Ogre::Vector4 vec4(srcVerts[i].x, srcVerts[i].y, srcVerts[i].z, 1.0f);
                vec4 = mat4*vec4;
                srcVerts[i] = Ogre::Vector3(&vec4[0]);
            }
            for(size_t i = 0;i < srcNorms.size();i++)
            {
                Ogre::Vector4 vec4(srcNorms[i].x, srcNorms[i].y, srcNorms[i].z, 0.0f);
                vec4 = mat4*vec4;
                srcNorms[i] = Ogre::Vector3(&vec4[0]);
            }
        }
    }

    // Set the bounding box first
    BoundsFinder bounds;
    bounds.add(&srcVerts[0][0], srcVerts.size());
    if(!bounds.isValid())
    {
        float v[3] = { 0.0f, 0.0f, 0.0f };
        bounds.add(&v[0], 1);
    }

    mesh->_setBounds(Ogre::AxisAlignedBox(bounds.minX()-0.5f, bounds.minY()-0.5f, bounds.minZ()-0.5f,
                                          bounds.maxX()+0.5f, bounds.maxY()+0.5f, bounds.maxZ()+0.5f));
    mesh->_setBoundingSphereRadius(bounds.getRadius());

    // This function is just one long stream of Ogre-barf, but it works
    // great.
    Ogre::HardwareBufferManager *hwBufMgr = Ogre::HardwareBufferManager::getSingletonPtr();
    Ogre::HardwareVertexBufferSharedPtr vbuf;
    Ogre::HardwareIndexBufferSharedPtr ibuf;
    Ogre::VertexBufferBinding *bind;
    Ogre::VertexDeclaration *decl;
    int nextBuf = 0;

    Ogre::SubMesh *sub = mesh->createSubMesh();

    // Add vertices
    sub->useSharedVertices = false;
    sub->vertexData = new Ogre::VertexData();
    sub->vertexData->vertexStart = 0;
    sub->vertexData->vertexCount = srcVerts.size();

    decl = sub->vertexData->vertexDeclaration;
    bind = sub->vertexData->vertexBufferBinding;
    if(srcVerts.size())
    {
        vbuf = hwBufMgr->createVertexBuffer(Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3),
                                            srcVerts.size(), vertUsage, vertShadowBuffer);
        vbuf->writeData(0, vbuf->getSizeInBytes(), &srcVerts[0][0], true);

        decl->addElement(nextBuf, 0, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
        bind->setBinding(nextBuf++, vbuf);
    }

    // Vertex normals
    if(srcNorms.size())
    {
        vbuf = hwBufMgr->createVertexBuffer(Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3),
                                            srcNorms.size(), vertUsage, vertShadowBuffer);
        vbuf->writeData(0, vbuf->getSizeInBytes(), &srcNorms[0][0], true);

        decl->addElement(nextBuf, 0, Ogre::VET_FLOAT3, Ogre::VES_NORMAL);

    void Utils::GetMeshInformation(
        const Ogre::MeshPtr mesh,
        size_t &vertexCount,
        Ogre::Vector3* &vertices,
        size_t &indexCount,
        unsigned* &indices) 
    {
        bool addShared = false;
        size_t currentOffset = 0;
        size_t shared_offset = 0;
        size_t nextOffset = 0;
        size_t indexOffset = 0;


        vertexCount = indexCount = 0;

        for ( unsigned short i = 0; i < mesh->getNumSubMeshes(); ++i) {
            Ogre::SubMesh* submesh = mesh->getSubMesh(i);
            if(submesh->useSharedVertices) {
                if( !addShared ) {
                    vertexCount += mesh->sharedVertexData->vertexCount;
                    addShared = true;
                }
            }
            else {
                vertexCount += submesh->vertexData->vertexCount;
            }
            indexCount += submesh->indexData->indexCount;
        }


        vertices = new Ogre::Vector3[vertexCount];
        indices = new unsigned[indexCount];

        addShared = false;

        for (unsigned short i = 0; i < mesh->getNumSubMeshes(); ++i) {
            Ogre::SubMesh* submesh = mesh->getSubMesh(i);

            Ogre::VertexData* vertexData = submesh->useSharedVertices ? mesh->sharedVertexData : submesh->vertexData;

            if ((!submesh->useSharedVertices) || (submesh->useSharedVertices && !addShared)) {
                if(submesh->useSharedVertices) {
                    addShared = true;
                    shared_offset = currentOffset;
                }

                const Ogre::VertexElement* posElem =
                    vertexData->vertexDeclaration->findElementBySemantic(Ogre::VES_POSITION);

                Ogre::HardwareVertexBufferSharedPtr vbuf =
                    vertexData->vertexBufferBinding->getBuffer(posElem->getSource());

                unsigned char* vertex =
                    static_cast<unsigned char*>(vbuf->lock(Ogre::HardwareBuffer::HBL_READ_ONLY));

                float* pReal;

                for( size_t j = 0; j < vertexData->vertexCount; ++j, vertex += vbuf->getVertexSize()) {
                    posElem->baseVertexPointerToElement(vertex, &pReal);
                    Ogre::Vector3 pt(pReal[0], pReal[1], pReal[2]);
                    vertices[currentOffset + j] = pt;
                }
                
                vbuf->unlock();
                nextOffset += vertexData->vertexCount;
            }


            Ogre::IndexData* indexData = submesh->indexData;
            size_t numTris = indexData->indexCount / 3;
            Ogre::HardwareIndexBufferSharedPtr ibuf = indexData->indexBuffer;
            
            bool use32bitindexes = (ibuf->getType() == Ogre::HardwareIndexBuffer::IT_32BIT);

            unsigned long* pLong = static_cast<unsigned long*>(ibuf->lock(Ogre::HardwareBuffer::HBL_READ_ONLY));
            unsigned short* pShort = reinterpret_cast<unsigned short*>(pLong);

            size_t offset = (submesh->useSharedVertices)? shared_offset : currentOffset;

            if ( use32bitindexes ) {
                for ( size_t k = 0; k < numTris*3; ++k) {
                    indices[indexOffset++] = pLong[k] + static_cast<unsigned long>(offset);
                }
            }
            else {
                for ( size_t k = 0; k < numTris*3; ++k) {
                    indices[indexOffset++] = static_cast<unsigned long>(pShort[k]) +
                                              static_cast<unsigned long>(offset);
                }
            }

            ibuf->unlock();
            currentOffset = nextOffset;
        }
    }

//.........这里部分代码省略.........
            size_t offset = 0;
            mesh->sharedVertexData->vertexDeclaration->addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
            offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
            mesh->sharedVertexData->vertexDeclaration->addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_TEXTURE_COORDINATES);

            // Create and bind vertex buffer
            mesh->sharedVertexData->vertexCount = 14;
            Ogre::HardwareVertexBufferSharedPtr vertexBuffer =
                Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(
                    mesh->sharedVertexData->vertexDeclaration->getVertexSize(0),
                    mesh->sharedVertexData->vertexCount,
                    Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
            mesh->sharedVertexData->vertexBufferBinding->setBinding(0, vertexBuffer);

            // Vertex data
            static const float vertexData[] = {
                // Position      Texture coordinates    // Index
                0.0, 2.0, -1.0, 1.0, 1.0, //  0
                0.0, 1.0, -1.0, -1.0, 1.0, //  1
                1.0, 2.0, -1.0, 1.0, -1.0, //  2
                1.0, 1.0, -1.0, -1.0, -1.0, //  3
                2.0, 2.0, 1.0, 1.0, -1.0, //  4
                2.0, 1.0, 1.0, -1.0, -1.0, //  5
                3.0, 2.0, 1.0, 1.0, 1.0, //  6
                3.0, 1.0, 1.0, -1.0, 1.0, //  7
                4.0, 2.0, -1.0, 1.0, 1.0, //  8
                4.0, 1.0, -1.0, -1.0, 1.0, //  9
                1.0, 3.0, -1.0, 1.0, 1.0, // 10
                2.0, 3.0, 1.0, 1.0, 1.0, // 11
                1.0, 0.0, -1.0, -1.0, 1.0, // 12
                2.0, 0.0, 1.0, -1.0, 1.0, // 13
            };

            // Fill vertex buffer
            float* pData = static_cast<float*>(vertexBuffer->lock(Ogre::HardwareBuffer::HBL_DISCARD));
            for (size_t vertex = 0, i = 0; vertex < mesh->sharedVertexData->vertexCount; vertex++)
            {
                // Position
                *pData++ = position.x + scale * vertexData[i++];
                *pData++ = position.y + scale * vertexData[i++];
                *pData++ = 0.0;

                // Texture coordinates
                *pData++ = vertexData[i++];
                *pData++ = vertexData[i++];
                *pData++ = vertexData[i++];
            }
            vertexBuffer->unlock();

            // Create index buffer
            sub->indexData->indexCount = 36;
            Ogre::HardwareIndexBufferSharedPtr indexBuffer =
                Ogre::HardwareBufferManager::getSingleton().createIndexBuffer(
                    Ogre::HardwareIndexBuffer::IT_16BIT,
                    sub->indexData->indexCount,
                    Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
            sub->indexData->indexBuffer = indexBuffer;

            // Index data
            static const Ogre::uint16 indexData[] = {
                // Indices         // Face
                 0,  1,  2,        //  0
                 2,  1,  3,        //  1
                 2,  3,  4,        //  2
                 4,  3,  5,        //  3
                 4,  5,  6,        //  4
                 6,  5,  7,        //  5
                 6,  7,  8,        //  6
                 8,  7,  9,        //  7
                10,  2, 11,        //  8
                11,  2,  4,        //  9
                 3, 12,  5,        // 10
                 5, 12, 13,        // 11
            };

            // Fill index buffer
            indexBuffer->writeData(0, indexBuffer->getSizeInBytes(), indexData, true);

            mesh->_setBounds(Ogre::AxisAlignedBox::BOX_INFINITE);
            mesh->_setBoundingSphereRadius(10);
            mesh->load();

            Ogre::Entity* e = gEnv->sceneManager->createEntity(mesh->getName());
            e->setCastShadows(false);
            e->setRenderQueueGroup(Ogre::RENDER_QUEUE_OVERLAY - 1);
            e->setVisible(true);

            e->setMaterialName("tracks/EnvMapDebug");
            Ogre::SceneNode* mDebugSceneNode = new Ogre::SceneNode(gEnv->sceneManager);
            mDebugSceneNode->attachObject(e);
            mDebugSceneNode->setPosition(Ogre::Vector3(0, 0, -5));
            mDebugSceneNode->setFixedYawAxis(true, Ogre::Vector3::UNIT_Y);
            mDebugSceneNode->setVisible(true);
            mDebugSceneNode->_update(true, true);
            mDebugSceneNode->_updateBounds();
            overlay->add3D(mDebugSceneNode);
            overlay->show();
        }
    }
}

void
TerrainTileEditable::createGeometry(TerrainData* data, int xbase, int zbase, int xsize, int zsize)
{
    destoryGeometry();

    // build the material backet map
    MaterialBucketMap materialBucketMap;
    buildMaterialBucketMap(materialBucketMap);

	// Build renderables
    for (MaterialBucketMap::const_iterator im = materialBucketMap.begin(); im != materialBucketMap.end(); ++im)
	{
        const MaterialBucket* mb = &im->second;

        TerrainTileEditableRenderable* renderable = new TerrainTileEditableRenderable(this, mb->layerIndex);
        mRenderables.push_back(renderable);

        size_t numQuads = mb->grids.size();
        size_t indexCount = numQuads * 6;

		renderable->mMaterial = mb->material;

		Ogre::HardwareIndexBufferSharedPtr indexBuffer =
			Ogre::HardwareBufferManager::getSingleton().createIndexBuffer(
				Ogre::HardwareIndexBuffer::IT_16BIT,
				indexCount,
				Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);

		Ogre::IndexData* indexData = new Ogre::IndexData;
		indexData->indexBuffer = indexBuffer;
		indexData->indexStart = 0;
		indexData->indexCount = indexCount;

        renderable->mRenderOp.indexData = indexData;
        renderable->mRenderOp.vertexData = mVertexDatas[mb->layerIndex];
        renderable->mRenderOp.operationType = Ogre::RenderOperation::OT_TRIANGLE_LIST;
        renderable->mRenderOp.useIndexes = true;

		ushort* pIndices = static_cast<ushort*>(indexBuffer->lock(Ogre::HardwareBuffer::HBL_DISCARD));
        for (GridIdList::const_iterator igrid = mb->grids.begin(); igrid != mb->grids.end(); ++igrid)
		{
            size_t grid = *igrid;
            const TerrainData::GridInfo& gridInfo = data->mGridInfos[grid];
            const TerrainData::Corner* corners = gridInfo.getCorners();
            int x = grid % data->mXSize - xbase;
            int z = grid / data->mXSize - zbase;
            assert(x < xsize && z < zsize);
            size_t index = (z*xsize + x) * 4;

            *pIndices++ = index + corners[1];
            *pIndices++ = index + corners[0];
            *pIndices++ = index + corners[2];

            *pIndices++ = index + corners[1];
            *pIndices++ = index + corners[2];
            *pIndices++ = index + corners[3];
		}
		indexBuffer->unlock();
	}

    for (size_t layerIndex = 0; layerIndex < 2; ++layerIndex)
    {
        fillLayerBuffer(layerIndex, mVertexDatas.back()->vertexBufferBinding->getBuffer(layerIndex+1));
    }

    mGeometryOutOfDate = false;
}

void GeometryFactory::generateSphericDome (const Ogre::String &name, int segments, DomeType type) {
    // Return now if already exists
    if (Ogre::MeshManager::getSingleton ().resourceExists (name)) {
        return;
    }

    Ogre::LogManager::getSingleton ().logMessage (
        "Caelum: Creating " + name + " sphere mesh resource...");

    // Use the mesh manager to create the mesh
    Ogre::MeshPtr msh = Ogre::MeshManager::getSingleton ().createManual (name, RESOURCE_GROUP_NAME);
    // Create a submesh
    Ogre::SubMesh *sub = msh->createSubMesh ();

    // Create the shared vertex data
    Ogre::VertexData *vertexData = new Ogre::VertexData ();
    msh->sharedVertexData = vertexData;

    // Define the vertices' format
    Ogre::VertexDeclaration *vertexDecl = vertexData->vertexDeclaration;
    size_t currOffset = 0;
    // Position
    vertexDecl->addElement (0, currOffset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
    currOffset += Ogre::VertexElement::getTypeSize (Ogre::VET_FLOAT3);
    // Normal
    vertexDecl->addElement (0, currOffset, Ogre::VET_FLOAT3, Ogre::VES_NORMAL);
    currOffset += Ogre::VertexElement::getTypeSize (Ogre::VET_FLOAT3);
    // Texture coordinates
    vertexDecl->addElement (0, currOffset, Ogre::VET_FLOAT2, Ogre::VES_TEXTURE_COORDINATES, 0);
    currOffset += Ogre::VertexElement::getTypeSize (Ogre::VET_FLOAT2);

    // Allocate the vertex buffer
    switch (type) {
    case DT_GRADIENTS:
        vertexData->vertexCount = segments * (segments - 1) + 2;
        break;
    case DT_STARFIELD:
        vertexData->vertexCount = (segments + 1) * (segments + 1);
        break;
    };
    Ogre::HardwareVertexBufferSharedPtr vBuf = Ogre::HardwareBufferManager::getSingleton ().createVertexBuffer (vertexDecl->getVertexSize (0), vertexData->vertexCount, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY, false);
    Ogre::VertexBufferBinding *binding = vertexData->vertexBufferBinding;
    binding->setBinding (0, vBuf);

    float *pVertex = static_cast<float *>(vBuf->lock (Ogre::HardwareBuffer::HBL_DISCARD));

    // Allocate the index buffer
    switch (type) {
    case DT_GRADIENTS:
        sub->indexData->indexCount = 2 * segments * (segments - 1) * 3;
        break;
    case DT_STARFIELD:
        sub->indexData->indexCount = 2 * (segments - 1) * segments * 3;
        break;
    };
    sub->indexData->indexBuffer = Ogre::HardwareBufferManager::getSingleton ().createIndexBuffer (Ogre::HardwareIndexBuffer::IT_16BIT, sub->indexData->indexCount, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY, false);
    Ogre::HardwareIndexBufferSharedPtr iBuf = sub->indexData->indexBuffer;
    unsigned short *pIndices = static_cast<unsigned short *>(iBuf->lock (Ogre::HardwareBuffer::HBL_DISCARD));

    // Fill the buffers
    switch (type) {
    case DT_GRADIENTS:
        fillGradientsDomeBuffers (pVertex, pIndices, segments);
        break;
    case DT_STARFIELD:
        fillStarfieldDomeBuffers (pVertex, pIndices, segments);
        break;
    };

    // Close the vertex buffer
    vBuf->unlock ();

    // Close the index buffer
    iBuf->unlock ();

    // Finishing it...
    sub->useSharedVertices = true;
    msh->_setBounds (Ogre::AxisAlignedBox (-1, -1, -1, 1, 1, 1), false);
    msh->_setBoundingSphereRadius (1);
    msh->load ();

    Ogre::LogManager::getSingleton ().logMessage (
        "Caelum: generateSphericDome DONE");
}

GrassPatch::GrassPatch(int nb_blades, int nb_blade_segments, float width, float height, Ogre::SceneManager* ScnMgr)
{
	int		i, nb_particles;

	// Create the particle field
	nb_particles = nb_blades * (nb_blade_segments + 1);
	m_Particles = new GrassParticleField(nb_particles, 1);

	// Allocate the blade list
	m_Blades = new Blade *[nb_blades];
	m_NbBlades = nb_blades;
	Ogre::Radian *angle = new Ogre::Radian(Ogre::Math::PI * ((rand()%1000) / 1000.0f));

	// Create the blades of grass
	for (i = 0; i < nb_blades; i++)
	{
		m_Blades[i] = new Blade(m_Particles,
								i * (nb_blade_segments + 1),
								nb_blade_segments,
								4 + ((rand()%1000) / 1000.0f)*0.5f,
								0.3f + ((rand()%1000) / 1000.0f)*0.1f,
								width / 2 - ((rand()%1000) / 500.0f) * width,
								height / 2 - ((rand()%1000) / 500.0f) * height,
								*angle);
		m_Blades[i]->moving = true;
		m_Blades[i]->timeout = 0;
	}
	m_VertexCount = nb_blades * m_Blades[0]->GetStrippedVertexCount();
	m_TriangleCount = ((nb_blade_segments - 1) << 1) + 1;
 
    mvertexData = new Ogre::VertexData ();

    // Vertex declaration
	Ogre::VertexDeclaration* decl = mvertexData->vertexDeclaration;
	Ogre::VertexBufferBinding* binding = mvertexData->vertexBufferBinding;         
    
    size_t offset = 0;

    //position
	decl->addElement (POSITION_BINDING, 0, Ogre::VET_FLOAT3, Ogre::VES_POSITION); 
	offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);

    // normal here
	decl->addElement(POSITION_BINDING, offset, Ogre::VET_FLOAT3, Ogre::VES_NORMAL);
	offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
     
    // Diffuse Color
    decl->addElement(POSITION_BINDING, offset, Ogre::VET_COLOUR, Ogre::VES_DIFFUSE);  
	offset += Ogre::VertexElement::getTypeSize(Ogre::VET_COLOUR);
    
    // texture here
	decl->addElement(POSITION_BINDING, offset, Ogre::VET_FLOAT2, Ogre::VES_TEXTURE_COORDINATES);  
	offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT2);

   //position updated each frame 
	Ogre::HardwareVertexBufferSharedPtr vbuf1 = 
           Ogre::HardwareBufferManager::getSingleton().createVertexBuffer (offset,        // size of one whole vertex
																		   m_VertexCount,                                // number of vertices
																		   Ogre::HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY, // usage
                                                                            false);                                      // no shadow buffer

	binding->setBinding(POSITION_BINDING, vbuf1);
 

	Ogre::HardwareVertexBufferSharedPtr vVertices = binding->getBuffer(POSITION_BINDING);
	Ogre::Real *pVertices = static_cast<Ogre::Real*>( vVertices->lock( Ogre::HardwareBuffer::HBL_DISCARD ) );

    // Colour up the blades
	for (i = 0; i < m_NbBlades; i++)
        m_Blades[i]->Paint (i, pVertices); 
       
	vVertices->unlock();

    // Index buffer to handle triangle strip vertex buffer as triangle list
     
    // Create index buffer 
      int nIndexes = m_TriangleCount*3*m_NbBlades;
   
      Ogre::HardwareIndexBufferSharedPtr iBuf = 
            Ogre::HardwareBufferManager::getSingleton().createIndexBuffer (Ogre::HardwareIndexBuffer::IT_32BIT, 
                                                                nIndexes, 
                                                                Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY, 
                                                                false); 

      // Fill index buffer 
      unsigned int* pIdx = static_cast<unsigned int*> (iBuf->lock (Ogre::HardwareBuffer::HBL_DISCARD)); 
               
       unsigned int j = 0;
        for (i = 0; i < m_NbBlades; i++)
	        m_Blades[i]->UpdateIndexBuffer(&j, i, pIdx);

      iBuf->unlock ();
          

    mRenderOp.vertexData = mvertexData;
//	mRenderOp.vertexData->vertexCount = m_VertexCount;
    mRenderOp.vertexData->vertexCount= nIndexes;
	mRenderOp.vertexData->vertexStart = 0;  

    mRenderOp.operationType = Ogre::RenderOperation::OT_TRIANGLE_LIST;
//.........这里部分代码省略.........