download_host_visible()

MAYAFLUX_API void MayaFlux::Buffers::download_host_visible	(	const std::shared_ptr< VKBuffer > &	source,
		const std::shared_ptr< VKBuffer > &	target
	)

Download data from a host-visible buffer.

Parameters

source	Source VKBuffer to download data from
target	Target VKBuffer to store the downloaded data

This function handles downloading data from a host-visible VKBuffer. It maps the buffer memory, copies the data into a CPU-accessible format, and updates the associated target buffer.

Definition at line 215 of file StagingUtils.cpp.

{
    auto& source_resources = source->get_buffer_resources();
    void* mapped = source_resources.mapped_ptr;
    if (!mapped) {
        error<std::runtime_error>(
            Journal::Component::Buffers,
            Journal::Context::BufferProcessing,
            std::source_location::current(),
            "Host-visible buffer has no mapped pointer");
    }
 
    source->mark_invalid_range(0, source->get_size_bytes());
 
    auto buffer_service = Registry::BackendRegistry::instance()
                              .get_service<Registry::Service::BufferService>();
 
    if (!buffer_service) {
        error<std::runtime_error>(
            Journal::Component::Buffers,
            Journal::Context::BufferProcessing,
            std::source_location::current(),
            "upload_host_visible requires a valid buffer service");
    }
 
    auto invalid_ranges = source->get_and_clear_invalid_ranges();
    for (auto& [offset, size] : invalid_ranges) {
        buffer_service->invalidate_range(
            source_resources.memory,
            offset,
            size);
    }
 
    std::vector<uint8_t> raw_bytes(source->get_size_bytes());
    std::memcpy(raw_bytes.data(), mapped, source->get_size_bytes());
 
    std::dynamic_pointer_cast<VKBuffer>(target)->set_data({ raw_bytes });
}

References MayaFlux::Journal::BufferProcessing, MayaFlux::Journal::Buffers, MayaFlux::Registry::BackendRegistry::get_service(), MayaFlux::Registry::BackendRegistry::instance(), offset, and size.

Referenced by download_from_gpu(), and MayaFlux::Buffers::BufferDownloadProcessor::download_host_visible().

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