type
  VkXlibSurfaceCreateInfoKHR* = object
    sType*: VkStructureType
    pNext*: pointer
    flags*: VkXlibSurfaceCreateFlagsKHR
    dpy*: ptr Display
    window*: Window

  Display* {.header: "X11/Xlib.h".} = object
  VisualID* {.header: "X11/Xlib.h".} = object
  Window* {.header: "X11/Xlib.h".} = object

# extension VK_KHR_xlib_surface
var
  vkCreateXlibSurfaceKHR*: proc(
    instance: VkInstance,
    pCreateInfo: ptr VkXlibSurfaceCreateInfoKHR,
    pAllocator: ptr VkAllocationCallbacks,
    pSurface: ptr VkSurfaceKHR,
  ): VkResult {.stdcall.}
  vkGetPhysicalDeviceXlibPresentationSupportKHR*: proc(
    physicalDevice: VkPhysicalDevice,
    queueFamilyIndex: uint32,
    dpy: ptr Display,
    visualID: VisualID,
  ): VkBool32 {.stdcall.}
proc loadVK_KHR_xlib_surface*(instance: VkInstance) =
  loadVK_KHR_surface(instance)
  vkCreateXlibSurfaceKHR = cast[proc(
    instance: VkInstance,
    pCreateInfo: ptr VkXlibSurfaceCreateInfoKHR,
    pAllocator: ptr VkAllocationCallbacks,
    pSurface: ptr VkSurfaceKHR,
  ): VkResult {.stdcall.}](vkGetInstanceProcAddr(instance, "vkCreateXlibSurfaceKHR"))
  vkGetPhysicalDeviceXlibPresentationSupportKHR = cast[proc(
    physicalDevice: VkPhysicalDevice,
    queueFamilyIndex: uint32,
    dpy: ptr Display,
    visualID: VisualID,
  ): VkBool32 {.stdcall.}](vkGetInstanceProcAddr(
    instance, "vkGetPhysicalDeviceXlibPresentationSupportKHR"
  ))