include::meta/VK_NN_vi_surface.txt[]

*Last Modified Date*::
    2016-12-02
*IP Status*::
    No known IP claims.
*Contributors*::
  - Mathias Heyer, NVIDIA
  - Michael Chock, NVIDIA
  - Yasuhiro Yoshioka, Nintendo
  - Daniel Koch, NVIDIA

The `VK_NN_vi_surface` extension is an instance extension.
It provides a mechanism to create a slink:VkSurfaceKHR object (defined by
the `<<VK_KHR_surface>>` extension) associated with an
code:nn::code:vi::code:Layer.

=== New Object Types

None

=== New Enum Constants

  * Extending elink:VkStructureType:
  ** ename:VK_STRUCTURE_TYPE_VI_SURFACE_CREATE_INFO_NN

=== New Enums

None

=== New Structures

  * slink:VkViSurfaceCreateInfoNN

=== New Functions

  * flink:vkCreateViSurfaceNN

=== Issues

1) Does VI need a way to query for compatibility between a particular
physical device (and queue family?) and a specific VI display?

*RESOLVED*: No.
It is currently always assumed that the device and display will always be
compatible.

2) slink:VkViSurfaceCreateInfoNN::pname:pWindow is intended to store an
code:nn::code:vi::code:NativeWindowHandle, but its declared type is a bare
code:void* to store the window handle.
Why the discrepancy?

*RESOLVED*: It is for C compatibility.
The definition for the VI native window handle type is defined inside the
code:nn::code:vi C++ namespace.
This prevents its use in C source files.
code:nn::code:vi::code:NativeWindowHandle is always defined to be
code:void*, so this extension uses code:void* to match.

=== Version History

 * Revision 1, 2016-12-2 (Michael Chock)
   - Initial draft.