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Vulkan-Docs/doc/specs/vulkan/appendices/VK_KHR_surface.txt
Jon Leech b7b1c3a65d Change log for January 5, 2018 Vulkan 1.0.67 spec update: 
* Bump API patch number and header version number to 67 for this update.
  * Update copyright dates to 2018

Github Issues:

  * Fix texture lookup functions in `GL_KHR_vulkan_glsl` specification
    (public pull request 363).
  * Clarify the state waited semaphores are left in when a call to
    flink:vkQueuePresentKHR fails (public issue 572).
  * Cleanup descriptions of slink:VkObjectTablePushConstantEntryNVX and
    slink:VkObjectTableDescriptorSetEntryNVX (public issue 583)
  * Remove redundant flink:vkCmdSetDiscardRectangleEXT valid usage
    statements (public pull 586).
  * Make dynamic state array length valid usage statements implicit for
    flink:vkCmdSetViewportWScalingNV, flink:vkCmdSetDiscardRectangleEXT, and
    flink:vkCmdSetViewport (public pull 589).
  * Clarify meaning of window extent (0,0) in slink:VkSwapchainKHR for the
    Windows and X11 platforms, in their respective extensions (public issue
    590).
  * Allow flink:vkGetPastPresentationTimingGOOGLE to return
    ename:VK_INCOMPLETE (public issue 604).
  * Add synchronization valid usage statements to flink:vkAcquireNextImage
    (public pull 611).
  * Fix some broken external links and internal xrefs (public pull 613).
  * Clean up slink:VkViewport valid usage statements in the presence or
    absence of relevant extensions (public pull 623).
  * Remove
    ename:VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_STENCIL_ATTACHMENT_OPTIMAL_KHR
    token from VK_KHR_maintenance2 from the non-extension VU path for
    slink:VkGraphicsPipelineCreateInfo (public issue 628).
  * Miscellaneous minor markup fixes - extension name strings (public pull
    631), Notes (pull 633), queue names emitted by generator scripts (pull
    634), block formatting in slink:VkDescriptorUpdateTemplateEntryKHR (pull
    635), ename:VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_CUBIC_BIT_IMG (pull
    641), quotes and apostrophes (pull 643),
  * Miscellaneous minor grammar fixes (public pull 644).
  * Fix markup macros so usage like ptext:*Src* works (public pull 647).

Internal Issues:

  * Clarify in the `VK_KHR_surface` and `VK_KHR_swapchain` extensions that
    parameter combinations which aren't supported for normal images are also
    unsupported for presentable images, even if the parameter values are
    individually supported as reported by the surface capability queries
    (internal issue 1029).
  * Fixed XML typo in the valid value field of the pname:sType member of
    slink:VkPhysicalDeviceExternalMemoryHostPropertiesEXT (internal issue
    1100).

Other Issues:

  * Add memory semantics validity rules to the <<spirvenv-module-validation,
    Validation Rules within a Module>> section of the SPIR-V environment
    appendix, and specify that sequentiality consistency is not supported.
    This forbids certain cases like "`Load+Release`" that we don't expect to
    ever be meaningful.
  * Document mapping of OpenGL Shading Language barriers to SPIR-V scope and
    semantics in the `GL_KHR_vulkan_glsl` specification.

New Extensions:

  * `VK_EXT_conservative_rasterization`
2018-01-05 17:39:15 -08:00

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// 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/
include::meta/VK_KHR_surface.txt[]
*Last Modified Date*::
2016-08-25
*IP Status*::
No known IP claims.
*Contributors*::
- Patrick Doane, Blizzard
- Ian Elliott, LunarG
- Jesse Hall, Google
- James Jones, NVIDIA
- David Mao, AMD
- Norbert Nopper, Freescale
- Alon Or-bach, Samsung
- Daniel Rakos, AMD
- Graham Sellers, AMD
- Jeff Vigil, Qualcomm
- Chia-I Wu, LunarG
- Jason Ekstrand, Intel
The `VK_KHR_surface` extension is an instance extension.
It introduces slink:VkSurfaceKHR objects, which abstract native platform
surface or window objects for use with Vulkan.
It also provides a way to determine whether a queue family in a physical
device supports presenting to particular surface.
Separate extensions for each platform provide the mechanisms for creating
slink:VkSurfaceKHR objects, but once created they may be used in this and
other platform-independent extensions, in particular the
`<<VK_KHR_swapchain>>` extension.
=== New Object Types
* slink:VkSurfaceKHR
=== New Enum Constants
* Extending elink:VkResult:
** ename:VK_ERROR_SURFACE_LOST_KHR
** ename:VK_ERROR_NATIVE_WINDOW_IN_USE_KHR
=== New Enums
* elink:VkSurfaceTransformFlagBitsKHR
* elink:VkPresentModeKHR
* elink:VkColorSpaceKHR
* elink:VkCompositeAlphaFlagBitsKHR
=== New Structures
* slink:VkSurfaceCapabilitiesKHR
* slink:VkSurfaceFormatKHR
=== New Functions
* flink:vkDestroySurfaceKHR
* flink:vkGetPhysicalDeviceSurfaceSupportKHR
* flink:vkGetPhysicalDeviceSurfaceCapabilitiesKHR
* flink:vkGetPhysicalDeviceSurfaceFormatsKHR
* flink:vkGetPhysicalDeviceSurfacePresentModesKHR
=== Examples
[NOTE]
.Note
====
The example code for the `VK_KHR_surface` and `<<VK_KHR_swapchain>>`
extensions was removed from the appendix after revision 1.0.29.
This WSI example code was ported to the cube demo that is shipped with the
official Khronos SDK, and is being kept up-to-date in that location (see:
https://github.com/KhronosGroup/Vulkan-LoaderAndValidationLayers/blob/master/demos/cube.c).
====
=== Issues
1) Should this extension include a method to query whether a physical device
supports presenting to a specific window or native surface on a given
platform?
*RESOLVED*: Yes.
Without this, applications would need to create a device instance to
determine whether a particular window can be presented to.
Knowing that a device supports presentation to a platform in general is not
sufficient, as a single machine might support multiple seats, or instances
of the platform that each use different underlying physical devices.
Additionally, on some platforms, such as the X Window System, different
drivers and devices might be used for different windows depending on which
section of the desktop they exist on.
2) Should the flink:vkGetPhysicalDeviceSurfaceCapabilitiesKHR,
flink:vkGetPhysicalDeviceSurfaceFormatsKHR, and
flink:vkGetPhysicalDeviceSurfacePresentModesKHR functions from
`<<VK_KHR_swapchain>>` be modified to operate on physical devices and moved
to this extension to implement the resolution of issue 1?
*RESOLVED*: No, separate query functions are needed, as the purposes served
are similar but incompatible.
The ftext:vkGetPhysicalDeviceSurface*KHR functions return information that
could potentially depend on an initialized device.
For example, the formats supported for presentation to the surface might
vary depending on which device extensions are enabled.
The query introduced to resolve issue 1 should be used only to query generic
driver or platform properties.
The physical device parameter is intended to serve only as an identifier
rather than a stateful object.
3) Should Vulkan include support Xlib or XCB as the API for accessing the X
Window System platform?
*RESOLVED*: Both.
XCB is a more modern and efficient API, but Xlib usage is deeply ingrained
in many applications and likely will remain in use for the foreseeable
future.
Not all drivers necessarily need to support both, but including both as
options in the core specification will probably encourage support, which
should in turn ease adoption of the Vulkan API in older codebases.
Additionally, the performance improvements possible with XCB likely will not
have a measurable impact on the performance of Vulkan presentation and other
minimal window system interactions defined here.
4) Should the GBM platform be included in the list of platform enums?
*RESOLVED*: Deferred, and will be addressed with a platform-specific
extension to be written in the future.
=== Version History
* Revision 1, 2015-05-20 (James Jones)
- Initial draft, based on LunarG KHR spec, other KHR specs, patches
attached to bugs.
* Revision 2, 2015-05-22 (Ian Elliott)
- Created initial Description section.
- Removed query for whether a platform requires the use of a queue for
presentation, since it was decided that presentation will always be
modeled as being part of the queue.
- Fixed typos and other minor mistakes.
* Revision 3, 2015-05-26 (Ian Elliott)
- Improved the Description section.
* Revision 4, 2015-05-27 (James Jones)
- Fixed compilation errors in example code.
* Revision 5, 2015-06-01 (James Jones)
- Added issues 1 and 2 and made related spec updates.
* Revision 6, 2015-06-01 (James Jones)
- Merged the platform type mappings table previously removed from
VK_KHR_swapchain with the platform description table in this spec.
- Added issues 3 and 4 documenting choices made when building the initial
list of native platforms supported.
* Revision 7, 2015-06-11 (Ian Elliott)
- Updated table 1 per input from the KHR TSG.
- Updated issue 4 (GBM) per discussion with Daniel Stone.
He will create a platform-specific extension sometime in the future.
* Revision 8, 2015-06-17 (James Jones)
- Updated enum-extending values using new convention.
- Fixed the value of VK_SURFACE_PLATFORM_INFO_TYPE_SUPPORTED_KHR.
* Revision 9, 2015-06-17 (James Jones)
- Rebased on Vulkan API version 126.
* Revision 10, 2015-06-18 (James Jones)
- Marked issues 2 and 3 resolved.
* Revision 11, 2015-06-23 (Ian Elliott)
- Examples now show use of function pointers for extension functions.
- Eliminated extraneous whitespace.
* Revision 12, 2015-07-07 (Daniel Rakos)
- Added error section describing when each error is expected to be
reported.
- Replaced the term "queue node index" with "queue family index" in the
spec as that is the agreed term to be used in the latest version of the
core header and spec.
- Replaced bool32_t with VkBool32.
* Revision 13, 2015-08-06 (Daniel Rakos)
- Updated spec against latest core API header version.
* Revision 14, 2015-08-20 (Ian Elliott)
- Renamed this extension and all of its enumerations, types, functions,
etc.
This makes it compliant with the proposed standard for Vulkan
extensions.
- Switched from "revision" to "version", including use of the
VK_MAKE_VERSION macro in the header file.
- Did miscellaneous cleanup, etc.
* Revision 15, 2015-08-20 (Ian Elliott--porting a 2015-07-29 change from
James Jones)
- Moved the surface transform enums here from VK_WSI_swapchain so they
could be re-used by VK_WSI_display.
* Revision 16, 2015-09-01 (James Jones)
- Restore single-field revision number.
* Revision 17, 2015-09-01 (James Jones)
- Fix example code compilation errors.
* Revision 18, 2015-09-26 (Jesse Hall)
- Replaced VkSurfaceDescriptionKHR with the VkSurfaceKHR object, which is
created via layered extensions.
Added VkDestroySurfaceKHR.
* Revision 19, 2015-09-28 (Jesse Hall)
- Renamed from VK_EXT_KHR_swapchain to VK_EXT_KHR_surface.
* Revision 20, 2015-09-30 (Jeff Vigil)
- Add error result VK_ERROR_SURFACE_LOST_KHR.
* Revision 21, 2015-10-15 (Daniel Rakos)
- Updated the resolution of issue #2 and include the surface capability
queries in this extension.
- Renamed SurfaceProperties to SurfaceCapabilities as it better reflects
that the values returned are the capabilities of the surface on a
particular device.
- Other minor cleanup and consistency changes.
* Revision 22, 2015-10-26 (Ian Elliott)
- Renamed from VK_EXT_KHR_surface to VK_KHR_surface.
* Revision 23, 2015-11-03 (Daniel Rakos)
- Added allocation callbacks to vkDestroySurfaceKHR.
* Revision 24, 2015-11-10 (Jesse Hall)
- Removed VkSurfaceTransformKHR.
Use VkSurfaceTransformFlagBitsKHR instead.
- Rename VkSurfaceCapabilitiesKHR member maxImageArraySize to
maxImageArrayLayers.
* Revision 25, 2016-01-14 (James Jones)
- Moved VK_ERROR_NATIVE_WINDOW_IN_USE_KHR from the VK_KHR_android_surface
to the VK_KHR_surface extension.
* 2016-08-23 (Ian Elliott)
- Update the example code, to not have so many characters per line, and
to split out a new example to show how to obtain function pointers.
* 2016-08-25 (Ian Elliott)
- A note was added at the beginning of the example code, stating that it
will be removed from future versions of the appendix.
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