Function vkAcquireNextImageKHR 

pub unsafe extern "system" fn vkAcquireNextImageKHR(
    device: VkDevice,
    swapchain: VkSwapchainKHR,
    timeout: u64,
    semaphore: Option<VkSemaphore>,
    fence: Option<VkFence>,
    pImageIndex: *mut u32,
) -> VkResult