// Copyright (c) 2014-2018 Khronos Group. This work is licensed under a
// Creative Commons Attribution 4.0 International License; see
// http://creativecommons.org/licenses/by/4.0/

[[platformCreateSurface_win32,platformCreateSurface_win32]]

=== Win32 Platform

[open,refpage='vkCreateWin32SurfaceKHR',desc='Create a slink:VkSurfaceKHR object for an Win32 native window',type='protos']
--

To create a sname:VkSurfaceKHR object for a Win32 window, call:

include::../../api/protos/vkCreateWin32SurfaceKHR.txt[]

  * pname:instance is the instance to associate the surface with.
  * pname:pCreateInfo is a pointer to an instance of the
    sname:VkWin32SurfaceCreateInfoKHR structure containing parameters
    affecting the creation of the surface object.
  * pname:pAllocator is the allocator used for host memory allocated for the
    surface object when there is no more specific allocator available (see
    <<memory-allocation,Memory Allocation>>).
  * pname:pSurface points to a slink:VkSurfaceKHR handle in which the
    created surface object is returned.

include::../../validity/protos/vkCreateWin32SurfaceKHR.txt[]
--

[open,refpage='VkWin32SurfaceCreateInfoKHR',desc='Structure specifying parameters of a newly created Win32 surface object',type='structs']
--

The sname:VkWin32SurfaceCreateInfoKHR structure is defined as:

include::../../api/structs/VkWin32SurfaceCreateInfoKHR.txt[]

  * pname:sType is the type of this structure.
  * pname:pNext is `NULL` or a pointer to an extension-specific structure.
  * pname:flags is reserved for future use.
  * pname:hinstance and pname:hwnd are the Win32 code:HINSTANCE and
    code:HWND for the window to associate the surface with.

.Valid Usage
****
  * [[VUID-VkWin32SurfaceCreateInfoKHR-hinstance-01307]]
    pname:hinstance must: be a valid Win32 code:HINSTANCE.
  * [[VUID-VkWin32SurfaceCreateInfoKHR-hwnd-01308]]
    pname:hwnd must: be a valid Win32 code:HWND.
****

include::../../validity/structs/VkWin32SurfaceCreateInfoKHR.txt[]
--

With Win32, pname:minImageExtent, pname:maxImageExtent, and
pname:currentExtent must: always equal the window size.

The pname:currentExtent of a Win32 surface must: have both pname:width and
pname:height greater than 0, or both of them 0.

[NOTE]
.Note
====
Due to above restrictions, it is only possible to create a new swapchain on
this platform with pname:imageExtent being equal to the current size of the
window.

The window size may: become [eq]#(0, 0)# on this platform (e.g. when the
window is minimized), and so a swapchain cannot: be created until the size
changes.
====