calculate_buffer_size()

size_t MayaFlux::Buffers::NetworkGeometryBuffer::calculate_buffer_size ( const std::shared_ptr< Nodes::Network::NodeNetwork > &  network, float  over_allocate_factor  )

staticprivate

Calculate initial buffer size based on network node count.

Definition at line 143 of file NetworkGeometryBuffer.cpp.

{
    if (!network) {
        return 0;
    }
 
    size_t node_count = network->get_node_count();
    if (node_count == 0) {
        MF_WARN(Journal::Component::Buffers, Journal::Context::BufferManagement,
            "NodeNetwork has zero nodes. Buffer will be created with minimum size.");
        return 4096;
    }
 
    size_t base_size = 0;
 
    if (auto* operator_ptr = network->get_operator()) {
        if (auto graphics_op = dynamic_cast<Nodes::Network::GraphicsOperator*>(operator_ptr)) {
            size_t vertex_count = graphics_op->get_vertex_count();
            auto layout = graphics_op->get_vertex_layout();
 
            if (vertex_count > 0 && layout.stride_bytes > 0) {
                base_size = vertex_count * layout.stride_bytes;
 
                MF_DEBUG(Journal::Component::Buffers, Journal::Context::BufferManagement,
                    "Network geometry buffer sizing: {} vertices × {} bytes = {} bytes (operator: {})",
                    vertex_count, layout.stride_bytes, base_size, operator_ptr->get_type_name());
            }
        }
    }
 
    if (base_size == 0) {
        size_t vertex_size = sizeof(Nodes::PointVertex);
        base_size = node_count * vertex_size;
 
        MF_DEBUG(Journal::Component::Buffers, Journal::Context::BufferManagement,
            "Network geometry buffer fallback sizing: {} nodes × {} bytes = {} bytes",
            node_count, vertex_size, base_size);
    }
 
    auto allocated_size = static_cast<size_t>(
        static_cast<float>(base_size) * over_allocate_factor);
 
    if (over_allocate_factor > 1.0F) {
        MF_DEBUG(Journal::Component::Buffers, Journal::Context::BufferManagement,
            "Over-allocated by {}x: {} → {} bytes",
            over_allocate_factor, base_size, allocated_size);
    }
 
    return allocated_size;
}

References MayaFlux::Journal::BufferManagement, MayaFlux::Journal::Buffers, MF_DEBUG, and MF_WARN.