C++ HardwareVertexBufferSharedPtr::isNull方法代码示例

void OgreMeshAsset::CreateKdTree()
{
    meshData.Clear();
    normals.clear();
    uvs.clear();
    subMeshTriangleCounts.clear();
    for(unsigned short i = 0; i < ogreMesh->getNumSubMeshes(); ++i)
    {
        Ogre::SubMesh *submesh = ogreMesh->getSubMesh(i);
        assert(submesh);
        
        Ogre::VertexData *vertexData = submesh->useSharedVertices ? ogreMesh->sharedVertexData : submesh->vertexData;
        assert(vertexData);
        
        const Ogre::VertexElement *posElem = vertexData->vertexDeclaration->findElementBySemantic(Ogre::VES_POSITION);
        if (!posElem)
        {
            subMeshTriangleCounts.push_back(0);
            continue; // No position element. Ignore this submesh.
        }
        
        Ogre::HardwareVertexBufferSharedPtr vbufPos = vertexData->vertexBufferBinding->getBuffer(posElem->getSource());

        unsigned char *pos = (unsigned char*)vbufPos->lock(Ogre::HardwareBuffer::HBL_READ_ONLY);
        assert(pos);
        size_t posOffset = posElem->getOffset();
        size_t posSize = vbufPos->getVertexSize();
        
        // Texcoord element is not mandatory
        unsigned char *texCoord = 0;
        size_t texOffset = 0;
        size_t texSize = 0;
        Ogre::HardwareVertexBufferSharedPtr vbufTex;
        const Ogre::VertexElement *texElem = vertexData->vertexDeclaration->findElementBySemantic(Ogre::VES_TEXTURE_COORDINATES);
        if (texElem)
        {
            vbufTex = vertexData->vertexBufferBinding->getBuffer(texElem->getSource());
            // Check if the texcoord buffer is different than the position buffer, in that case lock it separately
            if (vbufTex != vbufPos)
                texCoord = static_cast<unsigned char*>(vbufTex->lock(Ogre::HardwareBuffer::HBL_READ_ONLY));
            else
                texCoord = pos;
            texOffset = texElem->getOffset();
            texSize = vbufTex->getVertexSize();
        }
        
        Ogre::IndexData *indexData = submesh->indexData;
        Ogre::HardwareIndexBufferSharedPtr ibuf = indexData->indexBuffer;

        u32 *pLong = (u32*)ibuf->lock(Ogre::HardwareBuffer::HBL_READ_ONLY);
        u16 *pShort = (u16*)pLong;
        const bool use32BitIndices = (ibuf->getType() == Ogre::HardwareIndexBuffer::IT_32BIT);
        
        for(unsigned j = 0; j+2 < indexData->indexCount; j += 3)
        {
            unsigned i0, i1, i2;
            if (use32BitIndices)
            {
                i0 = pLong[j];
                i1 = pLong[j+1];
                i2 = pLong[j+2];
            }
            else
            {
                i0 = pShort[j];
                i1 = pShort[j+1];
                i2 = pShort[j+2];
            }
            
            float3 v0 = *(float3*)(pos + posOffset + i0 * posSize);
            float3 v1 = *(float3*)(pos + posOffset + i1 * posSize);
            float3 v2 = *(float3*)(pos + posOffset + i2 * posSize);
            Triangle t(v0, v1, v2);
            meshData.AddObjects(&t, 1);

            if (texElem)
            {
                uvs.push_back(*((float2*)(texCoord + texOffset + i0 * texSize)));
                uvs.push_back(*((float2*)(texCoord + texOffset + i1 * texSize)));
                uvs.push_back(*((float2*)(texCoord + texOffset + i2 * texSize)));
            }

            float3 edge1 = v1 - v0;
            float3 edge2 = v2 - v0;
            float3 normal = edge1.Cross(edge2);
            normal.Normalize();
            normals.push_back(normal);
        }
        subMeshTriangleCounts.push_back((int)(indexData->indexCount / 3));
        
        vbufPos->unlock();
        if (!vbufTex.isNull() && vbufTex != vbufPos)
            vbufTex->unlock();
        ibuf->unlock();
    }

    {
        PROFILE(OgreMeshAsset_KdTree_Build);
        meshData.Build();
    }
//.........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;
}