Function vkGetPhysicalDeviceExternalImageFormatPropertiesNV 

pub unsafe extern "system" fn vkGetPhysicalDeviceExternalImageFormatPropertiesNV(
    physicalDevice: VkPhysicalDevice,
    format: VkFormat,
    typ: VkImageType,
    tiling: VkImageTiling,
    usage: VkImageUsageFlags,
    flags: VkImageCreateFlags,
    externalHandleType: VkExternalMemoryHandleTypeFlagsNV,
    pExternalImageFormatProperties: *mut VkExternalImageFormatPropertiesNV,
) -> VkResult

Available if built with prototypes.