pub type PFN_vkAcquireNextImageKHR = unsafe extern "system" fn(_device: Device, _swapchain: SwapchainKHR, _timeout: u64, _semaphore: Semaphore, _fence: Fence, _image_index: *mut u32) -> Result;
https://www.khronos.org/registry/vulkan/specs/latest/man/html/vkAcquireNextImageKHR.html