image_at() [2/2]

std::shared_ptr< Core::VKImage > MayaFlux::Kakshya::WindowContainer::image_at	(	uint32_t	frame_index,
		const std::shared_ptr< Buffers::VKBuffer > &	staging
	)		const

Upload m_data[frame_index] reusing a caller-supplied staging buffer.

Parameters

frame_index	Index into m_data in [0, frame_capacity).
staging	Host-visible VKBuffer sized to at least w * h * bpp.

Definition at line 246 of file WindowContainer.cpp.

{
    if (frame_index >= m_data.size()) {
        MF_RT_WARN(Journal::Component::Kakshya, Journal::Context::ContainerProcessing,
            "WindowContainer::image_at(staging, {}) : out of range (capacity={})",
            frame_index, m_frame_capacity);
        return nullptr;
    }
 
    const uint64_t written = m_frames_written.load(std::memory_order_acquire);
    const uint32_t head = m_write_head.load(std::memory_order_acquire);
    const bool ring_full = written >= m_frame_capacity;
    if (!ring_full && frame_index >= head) {
        MF_RT_WARN(Journal::Component::Kakshya, Journal::Context::ContainerProcessing,
            "WindowContainer::image_at(staging, {}) : frame index is ahead of write head ({}), data may be stale or uninitialized",
            frame_index, head);
        return nullptr;
    }
 
    auto pixels = snapshot_pixels(frame_index);
    if (!pixels)
        return nullptr;
 
    const auto format = get_image_format();
    Memory::SerializedSeqlockWriteGuard image_guard(m_image_cache_lock);
    return Portal::Graphics::TextureLoom::instance().refresh_cached_image(
        m_frame_images[frame_index], sampled_image_key(pixels->width, pixels->height, format),
        pixels->pixels, staging);
}

References MayaFlux::Journal::ContainerProcessing, format, get_image_format(), MayaFlux::Portal::Graphics::TextureLoom::instance(), MayaFlux::Journal::Kakshya, m_data, m_frame_capacity, m_frame_images, m_frames_written, m_image_cache_lock, m_write_head, MF_RT_WARN, pixels, MayaFlux::Portal::Graphics::TextureLoom::refresh_cached_image(), and snapshot_pixels().

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