processing_function()

void MayaFlux::Buffers::GeometryBindingsProcessor::processing_function ( const std::shared_ptr< Buffer > &  buffer )

overridevirtual

BufferProcessor interface - uploads all bound geometries.

Parameters

buffer

The buffer this processor is attached to

Uploads all geometry nodes to their target vertex buffers. Uses staging buffers for device-local targets.

Implements MayaFlux::Buffers::BufferProcessor.

Definition at line 110 of file GeometryBindingsProcessor.cpp.

{
    if (m_bindings.empty()) {
        return;
    }
 
    auto vk_buffer = std::dynamic_pointer_cast<VKBuffer>(buffer);
    if (!vk_buffer) {
        MF_RT_ERROR(Journal::Component::Buffers, Journal::Context::BufferProcessing,
            "GeometryBindingsProcessor requires VKBuffer, got different buffer type");
        return;
    }
 
    for (auto& [name, binding] : m_bindings) {
        if (!binding.node->needs_gpu_update()) {
            MF_TRACE(Journal::Component::Buffers, Journal::Context::BufferProcessing,
                "Geometry '{}' unchanged, skipping upload", name);
            continue;
        }
 
        auto vertices = binding.node->get_vertex_data();
 
        if (vertices.empty()) {
            if (binding.gpu_vertex_buffer->is_host_visible()) {
                binding.gpu_vertex_buffer->clear();
            }
 
            if (binding.node->get_vertex_layout()) {
                binding.gpu_vertex_buffer->set_vertex_layout(
                    binding.node->get_vertex_layout().value());
            }
 
            MF_RT_TRACE(Journal::Component::Buffers, Journal::Context::BufferProcessing,
                "Geometry '{}' cleared", name);
            continue;
        }
 
        size_t required_size = vertices.size_bytes();
        size_t available_size = binding.gpu_vertex_buffer->get_size_bytes();
 
        if (required_size > available_size) {
            auto new_size = static_cast<size_t>(required_size * 1.5F);
 
            MF_RT_TRACE(Journal::Component::Buffers, Journal::Context::BufferProcessing,
                "Geometry '{}' growing: resizing GPU buffer from {} → {} bytes",
                name, available_size, new_size);
 
            binding.gpu_vertex_buffer->resize(new_size, false);
            available_size = new_size;
 
            if (binding.staging_buffer) {
                binding.staging_buffer->resize(new_size, false);
                MF_RT_TRACE(Journal::Component::Buffers, Journal::Context::BufferProcessing,
                    "Resized staging buffer for '{}' to {} bytes", name, new_size);
            }
        }
 
        size_t upload_size = std::min<size_t>(required_size, available_size);
 
        upload_to_gpu(
            vertices.data(),
            upload_size,
            binding.gpu_vertex_buffer,
            binding.staging_buffer);
 
        if (binding.node->get_vertex_layout()) {
            binding.gpu_vertex_buffer->set_vertex_layout(
                binding.node->get_vertex_layout().value());
 
            MF_RT_TRACE(Journal::Component::Buffers, Journal::Context::BufferProcessing,
                "Set vertex layout for '{}' ({} vertices, {} attributes)",
                name,
                binding.node->get_vertex_count(),
                binding.node->get_vertex_layout()->attributes.size());
        } else {
            MF_RT_WARN(Journal::Component::Buffers, Journal::Context::BufferProcessing,
                "Geometry node '{}' has no vertex layout. "
                "RenderProcessor may fail without layout info.",
                name);
        }
        binding.node->clear_gpu_update_flag();
    }
 
    bool attached_is_target = false;
    for (const auto& [name, binding] : m_bindings) {
        if (binding.gpu_vertex_buffer == vk_buffer) {
            attached_is_target = true;
            break;
        }
    }
 
    if (!attached_is_target && !m_bindings.empty()) {
        auto& first_binding = m_bindings.begin()->second;
        if (first_binding.node->needs_gpu_update()) {
            auto vertices = first_binding.node->get_vertex_data();
 
            if (!vertices.empty()) {
                size_t required_size = vertices.size_bytes();
                size_t available_size = vk_buffer->get_size_bytes();
 
                if (required_size > available_size) {
                    auto new_size = static_cast<size_t>(required_size * 1.5F);
 
                    MF_INFO(Journal::Component::Buffers, Journal::Context::BufferProcessing,
                        "Fallback geometry growing: resizing GPU buffer from {} → {} bytes",
                        available_size, new_size);
 
                    vk_buffer->resize(new_size, false);
                    available_size = new_size;
                }
 
                size_t upload_size = std::min<size_t>(required_size, available_size);
 
                std::shared_ptr<VKBuffer> staging = vk_buffer->is_host_visible() ? nullptr : first_binding.staging_buffer;
 
                upload_to_gpu(
                    vertices.data(),
                    upload_size,
                    vk_buffer,
                    staging);
 
                if (first_binding.node->get_vertex_layout()) {
                    vk_buffer->set_vertex_layout(
                        first_binding.node->get_vertex_layout().value());
                }
            }
            first_binding.node->clear_gpu_update_flag();
        }
    }
}

References MayaFlux::Journal::BufferProcessing, MayaFlux::Journal::Buffers, m_bindings, MF_INFO, MF_RT_ERROR, MF_RT_TRACE, MF_RT_WARN, MF_TRACE, and MayaFlux::Buffers::upload_to_gpu().

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