C++ Geometry::GetVertexStart方法代码示例

bool CustomGeometry::DrawOcclusion(OcclusionBuffer* buffer)
{
    bool success = true;

    for (unsigned i = 0; i < batches_.Size(); ++i)
    {
        Geometry* geometry = GetLodGeometry(i, 0);
        if (!geometry)
            continue;

        // Check that the material is suitable for occlusion (default material always is) and set culling mode
        Material* material = batches_[i].material_;
        if (material)
        {
            if (!material->GetOcclusion())
                continue;
            buffer->SetCullMode(material->GetCullMode());
        }
        else
            buffer->SetCullMode(CULL_CCW);

        const unsigned char* vertexData;
        unsigned vertexSize;
        const unsigned char* indexData;
        unsigned indexSize;
        unsigned elementMask;

        geometry->GetRawData(vertexData, vertexSize, indexData, indexSize, elementMask);
        // Check for valid geometry data
        if (!vertexData)
            continue;

        // Draw and check for running out of triangles
        success = buffer->Draw(node_->GetWorldTransform(), vertexData, vertexSize, geometry->GetVertexStart(),
            geometry->GetVertexCount());

        if (!success)
            break;
    }

    return success;
}

ConvexData::ConvexData(CustomGeometry* custom)
{
    PODVector<Vector3> vertices;
    unsigned numGeometries = custom->GetNumGeometries();
    
    for (unsigned i = 0; i < numGeometries; ++i)
    {
        Geometry* geom = custom->GetLodGeometry(i, 0);
        if (!geom)
        {
            LOGWARNING("Skipping null geometry for convex hull collision");
            continue;
        }
        
        const unsigned char* vertexData;
        const unsigned char* indexData;
        unsigned vertexSize;
        unsigned indexSize;
        unsigned elementMask;
        
        geom->GetRawData(vertexData, vertexSize, indexData, indexSize, elementMask);
        if (!vertexData)
        {
            LOGWARNING("Skipping geometry with no CPU-side geometry data for convex hull collision - no vertex data");
            continue;
        }
        
        unsigned vertexStart = geom->GetVertexStart();
        unsigned vertexCount = geom->GetVertexCount();
        
        // Copy vertex data
        for (unsigned j = 0; j < vertexCount; ++j)
        {
            const Vector3& v = *((const Vector3*)(&vertexData[(vertexStart + j) * vertexSize]));
            vertices.Push(v);
        }
    }
    
    BuildHull(vertices);
}

SharedPtr<Model> Model::Clone(const String& cloneName) const
{
    SharedPtr<Model> ret(new Model(context_));

    ret->SetName(cloneName);
    ret->boundingBox_ = boundingBox_;
    ret->skeleton_ = skeleton_;
    ret->geometryBoneMappings_ = geometryBoneMappings_;
    ret->geometryCenters_ = geometryCenters_;
    ret->morphs_ = morphs_;
    ret->morphRangeStarts_ = morphRangeStarts_;
    ret->morphRangeCounts_ = morphRangeCounts_;

    // Deep copy vertex/index buffers
    HashMap<VertexBuffer*, VertexBuffer*> vbMapping;
    for (Vector<SharedPtr<VertexBuffer> >::ConstIterator i = vertexBuffers_.Begin(); i != vertexBuffers_.End(); ++i)
    {
        VertexBuffer* origBuffer = *i;
        SharedPtr<VertexBuffer> cloneBuffer;

        if (origBuffer)
        {
            cloneBuffer = new VertexBuffer(context_);
            cloneBuffer->SetSize(origBuffer->GetVertexCount(), origBuffer->GetElementMask(), origBuffer->IsDynamic());
            cloneBuffer->SetShadowed(origBuffer->IsShadowed());
            if (origBuffer->IsShadowed())
                cloneBuffer->SetData(origBuffer->GetShadowData());
            else
            {
                void* origData = origBuffer->Lock(0, origBuffer->GetVertexCount());
                if (origData)
                    cloneBuffer->SetData(origData);
                else
                    URHO3D_LOGERROR("Failed to lock original vertex buffer for copying");
            }
            vbMapping[origBuffer] = cloneBuffer;
        }

        ret->vertexBuffers_.Push(cloneBuffer);
    }

    HashMap<IndexBuffer*, IndexBuffer*> ibMapping;
    for (Vector<SharedPtr<IndexBuffer> >::ConstIterator i = indexBuffers_.Begin(); i != indexBuffers_.End(); ++i)
    {
        IndexBuffer* origBuffer = *i;
        SharedPtr<IndexBuffer> cloneBuffer;

        if (origBuffer)
        {
            cloneBuffer = new IndexBuffer(context_);
            cloneBuffer->SetSize(origBuffer->GetIndexCount(), origBuffer->GetIndexSize() == sizeof(unsigned),
                origBuffer->IsDynamic());
            cloneBuffer->SetShadowed(origBuffer->IsShadowed());
            if (origBuffer->IsShadowed())
                cloneBuffer->SetData(origBuffer->GetShadowData());
            else
            {
                void* origData = origBuffer->Lock(0, origBuffer->GetIndexCount());
                if (origData)
                    cloneBuffer->SetData(origData);
                else
                    URHO3D_LOGERROR("Failed to lock original index buffer for copying");
            }
            ibMapping[origBuffer] = cloneBuffer;
        }

        ret->indexBuffers_.Push(cloneBuffer);
    }

    // Deep copy all the geometry LOD levels and refer to the copied vertex/index buffers
    ret->geometries_.Resize(geometries_.Size());
    for (unsigned i = 0; i < geometries_.Size(); ++i)
    {
        ret->geometries_[i].Resize(geometries_[i].Size());
        for (unsigned j = 0; j < geometries_[i].Size(); ++j)
        {
            SharedPtr<Geometry> cloneGeometry;
            Geometry* origGeometry = geometries_[i][j];

            if (origGeometry)
            {
                cloneGeometry = new Geometry(context_);
                cloneGeometry->SetIndexBuffer(ibMapping[origGeometry->GetIndexBuffer()]);
                unsigned numVbs = origGeometry->GetNumVertexBuffers();
                for (unsigned k = 0; k < numVbs; ++k)
                {
                    cloneGeometry->SetVertexBuffer(k, vbMapping[origGeometry->GetVertexBuffer(k)]);
                }
                cloneGeometry->SetDrawRange(origGeometry->GetPrimitiveType(), origGeometry->GetIndexStart(),
                    origGeometry->GetIndexCount(), origGeometry->GetVertexStart(), origGeometry->GetVertexCount(), false);
                cloneGeometry->SetLodDistance(origGeometry->GetLodDistance());
            }

            ret->geometries_[i][j] = cloneGeometry;
        }
    }


    // Deep copy the morph data (if any) to allow modifying it
    for (Vector<ModelMorph>::Iterator i = ret->morphs_.Begin(); i != ret->morphs_.End(); ++i)
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    unsigned positionStride = 0;
    unsigned normalStride = 0;
    unsigned skinningStride = 0;
    unsigned indexStride = 0;

    IndexBuffer* ib = geometry->GetIndexBuffer();
    if (ib)
    {
        indexData = ib->GetShadowData();
        indexStride = ib->GetIndexSize();
    }

    // For morphed models positions, normals and skinning may be in different buffers
    for (unsigned i = 0; i < geometry->GetNumVertexBuffers(); ++i)
    {
        VertexBuffer* vb = geometry->GetVertexBuffer(i);
        if (!vb)
            continue;

        unsigned elementMask = vb->GetElementMask();
        unsigned char* data = vb->GetShadowData();
        if (!data)
            continue;

        if (elementMask & MASK_POSITION)
        {
            positionData = data;
            positionStride = vb->GetVertexSize();
        }
        if (elementMask & MASK_NORMAL)
        {
            normalData = data + vb->GetElementOffset(SEM_NORMAL);
            normalStride = vb->GetVertexSize();
        }
        if (elementMask & MASK_BLENDWEIGHTS)
        {
            skinningData = data + vb->GetElementOffset(SEM_BLENDWEIGHTS);
            skinningStride = vb->GetVertexSize();
        }
    }

    // Positions and indices are needed
    if (!positionData)
    {
        // As a fallback, try to get the geometry's raw vertex/index data
        const PODVector<VertexElement>* elements;
        geometry->GetRawData(positionData, positionStride, indexData, indexStride, elements);
        if (!positionData)
        {
            URHO3D_LOGWARNING("Can not add decal, target drawable has no CPU-side geometry data");
            return;
        }
    }

    if (indexData)
    {
        unsigned indexStart = geometry->GetIndexStart();
        unsigned indexCount = geometry->GetIndexCount();

        // 16-bit indices
        if (indexStride == sizeof(unsigned short))
        {
            const unsigned short* indices = ((const unsigned short*)indexData) + indexStart;
            const unsigned short* indicesEnd = indices + indexCount;

            while (indices < indicesEnd)
            {
                GetFace(faces, target, batchIndex, indices[0], indices[1], indices[2], positionData, normalData, skinningData,
                    positionStride, normalStride, skinningStride, frustum, decalNormal, normalCutoff);
                indices += 3;
            }
        }
        else
        // 32-bit indices
        {
            const unsigned* indices = ((const unsigned*)indexData) + indexStart;
            const unsigned* indicesEnd = indices + indexCount;

            while (indices < indicesEnd)
            {
                GetFace(faces, target, batchIndex, indices[0], indices[1], indices[2], positionData, normalData, skinningData,
                    positionStride, normalStride, skinningStride, frustum, decalNormal, normalCutoff);
                indices += 3;
            }
        }
    }
    else
    {
        // Non-indexed geometry
        unsigned indices = geometry->GetVertexStart();
        unsigned indicesEnd = indices + geometry->GetVertexCount();

        while (indices + 2 < indicesEnd)
        {
            GetFace(faces, target, batchIndex, indices, indices + 1, indices + 2, positionData, normalData, skinningData,
                positionStride, normalStride, skinningStride, frustum, decalNormal, normalCutoff);
            indices += 3;
        }
    }
}