C++ VertexDeclaration::addElement方法代码示例

	// 创建定点缓冲区
	void CCustomShape::CreateAreaVertexBuffer()
	{
		
		if(0 == m_planePointArray.size())
		{
			return;
		}

        // 先把上次创建的缓冲区删掉
        ClearVertexBuffer();

        mRenderOp.vertexData = new Ogre::VertexData;

        mRenderOp.vertexData->vertexCount = m_planePointArray.size();
        mRenderOp.vertexData->vertexStart = 0;
      
		Ogre::VertexDeclaration *decl = mRenderOp.vertexData->vertexDeclaration;

		// 声明定点格式
        size_t offset = 0;
      	decl->addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
        offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
        decl->addElement(0, offset, Ogre::VET_COLOUR, Ogre::VES_DIFFUSE);

	     m_vbuf = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(
            decl->getVertexSize(0),
            mRenderOp.vertexData->vertexCount,
            Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);

         mRenderOp.vertexData->vertexBufferBinding->setBinding(0, m_vbuf);
	}

void LIRenImageOverlay::initialise ()
{
	if (mInitialised)
		return;
	mInitialised = true;

	/* Initialize the render operation. */
	render_op.vertexData = new Ogre::VertexData ();
	render_op.vertexData->vertexStart = 0;
	render_op.vertexData->vertexCount = 0;

	/* Setup the vertex format. */
	size_t offset = 0;
	Ogre::VertexDeclaration* format = render_op.vertexData->vertexDeclaration;
	format->addElement (0, offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
	offset += Ogre::VertexElement::getTypeSize (Ogre::VET_FLOAT3);
	format->addElement (0, offset, Ogre::VET_FLOAT2, Ogre::VES_TEXTURE_COORDINATES);
	offset += Ogre::VertexElement::getTypeSize (Ogre::VET_FLOAT2);
	format->addElement (0, offset, Ogre::VET_COLOUR_ABGR, Ogre::VES_DIFFUSE);
	offset += Ogre::VertexElement::getTypeSize (Ogre::VET_COLOUR_ABGR);
	lisys_assert (offset == VERTEX_SIZE);

	/* Create the vertex buffer. */
	vbuf = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer (
		offset, VERTEX_COUNT_INIT, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);

	/* Bind the vertex buffer. */
	render_op.vertexData->vertexBufferBinding->setBinding (0, vbuf);
	render_op.useIndexes = false;
	render_op.operationType = Ogre::RenderOperation::OT_TRIANGLE_LIST;
}

void OgreImGui::ImGUIRenderable::initImGUIRenderable(void)
{
    // use identity projection and view matrices
    mUseIdentityProjection  = true;
    mUseIdentityView        = true;

    mRenderOp.vertexData = OGRE_NEW Ogre::VertexData();
    mRenderOp.indexData  = OGRE_NEW Ogre::IndexData();

    mRenderOp.vertexData->vertexCount = 0;
    mRenderOp.vertexData->vertexStart = 0;

    mRenderOp.indexData->indexCount = 0;
    mRenderOp.indexData->indexStart = 0;
    mRenderOp.operationType = Ogre::RenderOperation::OT_TRIANGLE_LIST;
    mRenderOp.useIndexes  = true; 
    mRenderOp.useGlobalInstancingVertexBufferIsAvailable = false;

    Ogre::VertexDeclaration* decl = mRenderOp.vertexData->vertexDeclaration;
        
    // vertex declaration
    size_t offset = 0;
    decl->addElement(0,offset,Ogre::VET_FLOAT2,Ogre::VES_POSITION);
    offset += Ogre::VertexElement::getTypeSize( Ogre::VET_FLOAT2 );
    decl->addElement(0,offset,Ogre::VET_FLOAT2,Ogre::VES_TEXTURE_COORDINATES,0);
    offset += Ogre::VertexElement::getTypeSize( Ogre::VET_FLOAT2 );
    decl->addElement(0,offset,Ogre::VET_COLOUR,Ogre::VES_DIFFUSE);

        
        // set basic white material
    this->setMaterial( "imgui/material" );
}

        Line3D::Line3D()
        {
            mRenderOp.vertexData = new Ogre::VertexData();
            this->SelfNode = Entresol::GetSingletonPtr()->GetSceneManager()->GetGraphicsWorldPointer()->getRootSceneNode()->createChildSceneNode();

            // Initialization stuff
            mRenderOp.indexData = 0;
            mRenderOp.vertexData->vertexCount = 1024;
            mRenderOp.vertexData->vertexStart = 0;
            mRenderOp.operationType = Ogre::RenderOperation::OT_LINE_LIST;
            mRenderOp.useIndexes = false;

            Ogre::VertexDeclaration* VDecl = mRenderOp.vertexData->vertexDeclaration;
            Ogre::VertexBufferBinding* VBind = mRenderOp.vertexData->vertexBufferBinding;

            size_t Offset = 0;
            // Position.
            VDecl->addElement(0,0,Ogre::VET_FLOAT3,Ogre::VES_POSITION);
            Offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);

            // Colour
            VDecl->addElement(0,Offset,Ogre::VET_FLOAT4,Ogre::VES_DIFFUSE);
            Offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT4);

            this->VertexBuffer = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(
                    VDecl->getVertexSize(0),
                    mRenderOp.vertexData->vertexCount,
                    Ogre::HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY_DISCARDABLE,
                    false);

            VBind->setBinding(0,this->VertexBuffer);

            this->setMaterial("BaseWhiteNoLighting");
        }

    void
    IntersectGrid::_createBuffer()
    {
        // 先把上次创建的缓冲区删掉
        if ( mRenderOp.vertexData )
        {
            delete mRenderOp.vertexData;
            mRenderOp.vertexData = 0;
        }

        if ( mCurrentVertexCount <= 0 )
            return;

        mRenderOp.vertexData = new Ogre::VertexData;

        mRenderOp.vertexData->vertexCount = mCurrentVertexCount;
        mRenderOp.vertexData->vertexStart = 0;
        Ogre::VertexDeclaration *decl = mRenderOp.vertexData->vertexDeclaration;

        size_t offset = 0;

        decl->addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);

        offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
        decl->addElement(0, offset, Ogre::VET_COLOUR, Ogre::VES_DIFFUSE);
        
        vbuf = 
            Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(
            decl->getVertexSize(0),
            mRenderOp.vertexData->vertexCount,
            Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);

        mRenderOp.vertexData->vertexBufferBinding->setBinding(0, vbuf);
    }

   AxisRenderable::AxisRenderable(int lineCount,Ogre::Camera* camera,Ogre::Viewport* viewport) 
   {
        // Disable cast shadows by default
        mCastShadows = false;

      mPrevAxisGizmoSelAxis = -1;
      mCamera = camera;
      mViewport = viewport;

      m_max_line_count = m_line_count  = lineCount;
      m_line_count = 0;

      mLength = 200;
      mProjectDistance = mCamera->getFarClipDistance();
      m_local = false;
      m_locked_data = 0;
      //m_locked_buffer = 0;
      mRenderOp.vertexData = new Ogre::VertexData();
      m_radius = 0;

      mRenderOp.indexData = 0;
      mRenderOp.vertexData->vertexCount = m_line_count*2;
      mRenderOp.vertexData->vertexStart = 0;

      mRenderOp.operationType = Ogre::RenderOperation::OT_LINE_LIST; 
      mRenderOp.useIndexes = false; 

      Ogre::VertexDeclaration* decl = mRenderOp.vertexData->vertexDeclaration;
      Ogre::VertexBufferBinding* bind = mRenderOp.vertexData->vertexBufferBinding;

      decl->addElement(0, 0, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
      decl->addElement(0, 3*sizeof(Ogre::Real), Ogre::VET_COLOUR, Ogre::VES_DIFFUSE);

      Ogre::HardwareVertexBufferSharedPtr vbuf = 
         Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(
         decl->getVertexSize(0),
         2*m_max_line_count,
         Ogre::HardwareBuffer::HBU_WRITE_ONLY);

      bind->setBinding(0, vbuf);

      // Obtain the pure colour material
      Ogre::MaterialPtr pureColourMaterial = createPureColourMaterial(Ogre::ColourValue(1,1,0));

      Ogre::String realName = pureColourMaterial->getName() + "_NoDepthBuffer";
      Ogre::MaterialPtr material = Ogre::MaterialManager::getSingleton().getByName(realName);
      if (material.isNull())
      {
          // Clone to avoid confuse somewhere else that using the same material
          material = pureColourMaterial->clone(realName);
          material->setDepthCheckEnabled(false);
          material->setDepthWriteEnabled(false);
      }

      setMaterial(material->getName());

      mBox.setExtents(-10,-10,-10,10,10,10);
      setQueryFlags(0);
   }

void Canvas::resizeBuffers()
{
	if(bufferSize < quadList.size())
	{
		bufferSize = quadList.size() * 2;
		destroyBuffers();
	}

	if(!vertexData)
	{
		vertexData = new Ogre::VertexData();
		vertexData->vertexStart = 0;
		vertexData->vertexCount = bufferSize * 4;

		Ogre::VertexDeclaration* decl = vertexData->vertexDeclaration;
		Ogre::VertexBufferBinding* binding = vertexData->vertexBufferBinding;

		size_t offset = 0;
		decl->addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
		offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
		decl->addElement(0, offset, Ogre::VET_COLOUR, Ogre::VES_DIFFUSE);
		offset += Ogre::VertexElement::getTypeSize(Ogre::VET_COLOUR);
		decl->addElement(0, offset, Ogre::VET_FLOAT2, Ogre::VES_TEXTURE_COORDINATES, 0);

		buffer = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(
			decl->getVertexSize(0), vertexData->vertexCount, Ogre::HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY_DISCARDABLE);
		binding->setBinding(0, buffer);
	}

	if(!indexData)
	{
		indexData = new Ogre::IndexData();
		indexData->indexStart = 0;
		indexData->indexCount = bufferSize * 6;

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

		unsigned short* indexBuffer = (unsigned short*)indexData->indexBuffer->lock(0, indexData->indexBuffer->getSizeInBytes(), Ogre::HardwareBuffer::HBL_DISCARD);

		// Indexes are generated here because we know that we will only be rendering quads
		// This means that we only have to handle updating the vertex buffer in Canvas::updateGeometry
		for(size_t indexIdx, vertexIdx, quadIdx = 0; quadIdx < bufferSize; quadIdx++)
		{
			indexIdx = quadIdx * 6;
			vertexIdx = quadIdx * 4;

			indexBuffer[indexIdx++] = (unsigned short)(vertexIdx + 0);
			indexBuffer[indexIdx++] = (unsigned short)(vertexIdx + 2);
			indexBuffer[indexIdx++] = (unsigned short)(vertexIdx + 1);
			indexBuffer[indexIdx++] = (unsigned short)(vertexIdx + 1);
			indexBuffer[indexIdx++] = (unsigned short)(vertexIdx + 2);
			indexBuffer[indexIdx++] = (unsigned short)(vertexIdx + 3);
		}

		indexData->indexBuffer->unlock();
	}
}

void CDynamicLineDrawer::CreateVertexDeclaration()
{
	// Points
	Ogre::VertexDeclaration *Decl = mRenderOp.vertexData->vertexDeclaration;
	Decl->addElement(POSITION_BINDING, 0, Ogre::VET_FLOAT3, Ogre::VES_POSITION);

	// Colour
	Decl->addElement(COLOUR_BINDING, 0, Ogre::VET_COLOUR, Ogre::VES_DIFFUSE);
}

void NxTriangles::createVertexDeclaration()
{
	Ogre::VertexDeclaration* vdecl =  mRenderOp.vertexData-> vertexDeclaration;
	vdecl->addElement(0, 0, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
	vdecl->addElement(1, 0, Ogre::VET_FLOAT3, Ogre::VES_NORMAL);
	if(mUseVertexColour) {
		vdecl->addElement( 2, 0, VET_COLOUR, VES_DIFFUSE );
	}
	else {
	 
		vdecl->addElement( 2, 0, mUVW ? VET_FLOAT3 : VET_FLOAT2, VES_TEXTURE_COORDINATES );
	}
	 
}

    Selection2D::Selection2D(bool includeTextureCoords) 
    {
        // use identity projection and view matrices
        mUseIdentityProjection = true;
        mUseIdentityView = true;

        mRenderOp.vertexData = OGRE_NEW Ogre::VertexData();
        mRenderOp.indexData = 0;
        mRenderOp.vertexData->vertexCount = 5;
        mRenderOp.vertexData->vertexStart = 0;
        mRenderOp.operationType = Ogre::RenderOperation::OT_LINE_STRIP;
        mRenderOp.useIndexes = false;
        Ogre::VertexDeclaration* decl = mRenderOp.vertexData->vertexDeclaration;
        Ogre::VertexBufferBinding* bind = mRenderOp.vertexData->vertexBufferBinding;
        decl->addElement(0, 0, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
        Ogre::HardwareVertexBufferSharedPtr vbuf = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(
            decl->getVertexSize(0), mRenderOp.vertexData->vertexCount, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
        // Bind buffer
        bind->setBinding(0, vbuf);

        this->setCastShadows(false);
        this->setQueryFlags(0); // set a query flag to exlude from queries (if necessary).

        // set basic white material
        this->setMaterial("BaseWhiteNoLighting");
    }

PortalOutlineRenderable::PortalOutlineRenderable(Ogre::String matname, Ogre::ColourValue colour)
{

	mRenderOp.vertexData = OGRE_NEW Ogre::VertexData();
	mRenderOp.indexData = 0;
	mRenderOp.vertexData->vertexCount = 10;//8
	mRenderOp.vertexData->vertexStart = 0;
	mRenderOp.operationType = Ogre::RenderOperation::OT_LINE_LIST;
	mRenderOp.useIndexes = false;
	Ogre::VertexDeclaration* decl = mRenderOp.vertexData->vertexDeclaration;
	Ogre::VertexBufferBinding* bind = mRenderOp.vertexData->vertexBufferBinding;
	decl->addElement(0, 0, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
	Ogre::HardwareVertexBufferSharedPtr vbuf = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(
		decl->getVertexSize(0), mRenderOp.vertexData->vertexCount, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
	// Bind buffer
	bind->setBinding(0, vbuf);
	// setup material
	createPortalMaterials();
	//Ogre::ResourceManager::ResourceCreateOrRetrieveResult result = Ogre::MaterialManager::getSingleton().createOrRetrieve(matname, "General");
	//if(result.second)
	//{
	//	Ogre::MaterialPtr matptrOBBoxManualMaterial = result.first;
	//    matptrOBBoxManualMaterial->setReceiveShadows(false);
	//    matptrOBBoxManualMaterial->getTechnique(0)->setLightingEnabled(true);
	//    matptrOBBoxManualMaterial->getTechnique(0)->getPass(0)->setDiffuse(colour);
	//    matptrOBBoxManualMaterial->getTechnique(0)->getPass(0)->setAmbient(colour);
	//    matptrOBBoxManualMaterial->getTechnique(0)->getPass(0)->setSelfIllumination(colour);
	//}


    this->setCastShadows(false);
    this->setQueryFlags(0); // set a query flag to exlude from queries (if necessary).
	this->setMaterial("PortalOutlineMaterial");
}

void DebugLines::draw()
{
   if(_drawn) return;
   else _drawn = true;

   // Initialization stuff
   mRenderOp.indexData = 0;
   mRenderOp.vertexData->vertexCount = _points.size();
   mRenderOp.vertexData->vertexStart = 0;
   mRenderOp.operationType = RenderOperation::OT_LINE_LIST;
   mRenderOp.useIndexes = false;

   Ogre::VertexDeclaration *decl = mRenderOp.vertexData->vertexDeclaration;
   Ogre::VertexBufferBinding *bind = mRenderOp.vertexData->vertexBufferBinding;

   decl->addElement(0, 0, VET_FLOAT3, VES_POSITION);

   HardwareVertexBufferSharedPtr vbuf =
	   HardwareBufferManager::getSingleton().createVertexBuffer(
         decl->getVertexSize(0),
         mRenderOp.vertexData->vertexCount,
		 HardwareBuffer::HBU_STATIC_WRITE_ONLY);

   bind->setBinding(0, vbuf);

   // Drawing stuff
   size_t size = _points.size();
   Vector3 vaabMin = _points[0];
   Vector3 vaabMax = _points[0];

   Real *prPos = static_cast<Real*>(vbuf->lock(HardwareBuffer::HBL_DISCARD));

   for(size_t i = 0; i < size; i++)
   {
      *prPos++ = _points[i].x;
      *prPos++ = _points[i].y;
      *prPos++ = _points[i].z;

      if(_points[i].x < vaabMin.x)
         vaabMin.x = _points[i].x;
      if(_points[i].y < vaabMin.y)
         vaabMin.y = _points[i].y;
      if(_points[i].z < vaabMin.z)
         vaabMin.z = _points[i].z;

      if(_points[i].x > vaabMax.x)
         vaabMax.x = _points[i].x;
      if(_points[i].y > vaabMax.y)
         vaabMax.y = _points[i].y;
      if(_points[i].z > vaabMax.z)
         vaabMax.z = _points[i].z;
   }

   vbuf->unlock();

   mBox.setExtents(vaabMin, vaabMax);
}

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
        TerrainGridRenderable::initTerrainGrid(int vertexCount)
    {
        m_locked_data = 0;

        mRenderOp.vertexData = new Ogre::VertexData();
        mRenderOp.indexData = 0;

        mRenderOp.vertexData->vertexCount = mVertexCount;
        mRenderOp.vertexData->vertexStart = 0;

        mRenderOp.operationType = Ogre::RenderOperation::OT_LINE_LIST; 
        mRenderOp.useIndexes = false; 

        Ogre::VertexDeclaration* decl = mRenderOp.vertexData->vertexDeclaration;
        Ogre::VertexBufferBinding* bind = mRenderOp.vertexData->vertexBufferBinding;

        decl->addElement(0, 0, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
        decl->addElement(0, 3*sizeof(Ogre::Real), Ogre::VET_COLOUR, Ogre::VES_DIFFUSE);

        Ogre::HardwareVertexBufferSharedPtr vbuf = 
            Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(
            decl->getVertexSize(0),
            vertexCount,
            Ogre::HardwareBuffer::HBU_WRITE_ONLY);

        bind->setBinding(0, vbuf);

        // set basic white material
        this->setMaterial("BaseWhiteNoLighting");
        mBox.setExtents(-10,-10,-10,10,10,10);

        lock();
        drawGridLines();
        unlock();
        
	//	getMaterial()->setSceneBlending(Ogre::SBT_TRANSPARENT_ALPHA);
        setQueryFlags(0);
    }

    void DynamicLines::createVertexDeclaration()
    {
        // we define the meaning of each batch of vertices added to the buffer
        //http://grahamedgecombe.com/blog/custom-meshes-in-ogre3d
        Ogre::VertexDeclaration *decl = mRenderOp.vertexData->vertexDeclaration;
        size_t offset = 0;

        decl->addElement(POSITION_BINDING, offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
        offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
        // dynamic renderable only has 1 buffer
//         decl->addElement(POSITION_BINDING, offset, Ogre::VET_FLOAT4, Ogre::VES_POSITION);
//         offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT4);
    }