ensure_cpu()

void MayaFlux::Kakshya::TextureContainer::ensure_cpu ( uint32_t  layer ) const

private

Download a GPU-held layer into m_data before a CPU read.

Definition at line 155 of file TextureContainer.cpp.

{
    if (layer >= m_cpu_stale.size() || !m_cpu_stale[layer].load(std::memory_order_acquire))
        return;
 
    std::shared_ptr<Core::VKImage> image;
    {
        Memory::SerializedSeqlockWriteGuard image_guard(m_image_cache_lock);
        image = m_layer_image_cache[layer].image;
    }
 
    const size_t element_count = static_cast<size_t>(m_width) * m_height * m_channels;
 
    Memory::SerializedSeqlockWriteGuard g(m_slot_locks[layer]);
    if (!m_cpu_stale[layer].load(std::memory_order_acquire))
        return;
 
    m_data[layer] = make_empty_storage(m_format, element_count);
    auto [ptr, bytes] = variant_bytes_mutable(m_data[layer]);
    if (image && image->is_initialized() && ptr && bytes == byte_size()) {
        TextureLoom::instance().download_data(image, ptr, bytes, nullptr);
    } else {
        MF_ERROR(Journal::Component::Kakshya, Journal::Context::ContainerProcessing,
            "TextureContainer: GPU-held layer {} could not be downloaded", layer);
    }
 
    m_cpu_stale[layer].store(false, std::memory_order_release);
    m_normalised_dirty[layer].store(true, std::memory_order_release);
}

References byte_size(), MayaFlux::Journal::ContainerProcessing, MayaFlux::Portal::Graphics::TextureLoom::download_data(), image, MayaFlux::Portal::Graphics::TextureLoom::instance(), MayaFlux::Journal::Kakshya, m_channels, m_cpu_stale, m_data, m_format, m_height, m_image_cache_lock, m_layer_image_cache, m_normalised_dirty, m_slot_locks, m_width, MayaFlux::Kakshya::make_empty_storage(), MF_ERROR, ptr, and MayaFlux::Kakshya::variant_bytes_mutable().

Referenced by as_float(), as_normalised_float(), as_uint16(), as_uint8(), channel_data(), ensure_cpu_all(), get_frames_typed_as(), get_raw_data(), get_region_data(), get_value_impl(), pixel_bytes(), pixel_bytes(), set_region_data(), set_value_impl(), and upload_image().

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