use vulkanalia::prelude::v1_0::*;
    // The Vulkan handles and associated properties used by our Vulkan app.
#[derive(Clone, Debug, Default)]
pub struct AppData {
    pub surface: vk::SurfaceKHR,
    pub messenger: vk::DebugUtilsMessengerEXT,
    pub physical_device: vk::PhysicalDevice,
    pub graphics_queue: vk::Queue,
    pub present_queue: vk::Queue,

    pub swapchain_format: vk::Format,
    pub swapchain_extent: vk::Extent2D,
    pub swapchain: vk::SwapchainKHR,
    pub swapchain_images: Vec<vk::Image>,

    pub swapchain_image_views: Vec<vk::ImageView>,

    pub pipeline_layout: vk::PipelineLayout,
    pub render_pass: vk::RenderPass,
    pub pipeline: vk::Pipeline,
    pub framebuffers: Vec<vk::Framebuffer>,
    pub command_pool: vk::CommandPool,
    pub command_buffers: Vec<vk::CommandBuffer>,

    pub image_available_semaphores: Vec<vk::Semaphore>,
    pub render_finished_semaphores: Vec<vk::Semaphore>,

    pub in_flight_fences: Vec<vk::Fence>,
    pub images_in_flight: Vec<vk::Fence>,

    pub vertex_buffer: vk::Buffer,
    pub vertex_buffer_memory: vk::DeviceMemory,
}