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59750fe4c7
* Update release number to 121.
Github Issues:
* Add missing `structextends` attribute in `vk.xml` for
slink:VkPhysicalDevicePipelineExecutablePropertiesFeaturesKHR (public
issue 1018).
* Change attributes of flink:vkCmdCopyAccelerationStructureNV,
flink:vkCmdWriteAccelerationStructuresPropertiesNV,
flink:vkCmdBuildAccelerationStructureNV, and flink:vkCmdTraceRaysNV to
require that these commands execute outside renderpasses (public issue
1021).
* Add an issue to the `<<VK_EXT_buffer_device_address>>` appendix
discussing the introduction of new names and aliasing by equivalent old
names (public pull request 1024).
Internal Issues:
* Protect the `VK_KHR_sampler_mirror_clamp_to_edge` extension with
asciidoctor conditionals, and remove it from the core-only specification
builds, where it had previously been force-included in the Makefile. It
is now treated like any other extension (internal issue 1776).
* Edit some asciidoctor anchor names starting with `features-features-` to
just start with `features-`, since the old chapters was split into 3
pieces. There are still some mild naming inconsistencies with anchors
which may be addressed in the future (internal issue 1792).
* Add `KHR` alias for the non-suffixed extension token
ename:VK_SAMPLER_ADDRESS_MODE_MIRROR_CLAMP_TO_EDGE, for compatibility
with naming rules for extensions (internal issue 1796).
* Clarify requirements for external memory in NOTEs for
sname:VkExternalMemoryBufferCreateInfo, and valid usage statements for
flink:vkBindBufferMemory, slink:VkBindBufferMemoryInfo,
flink:vkBindImageMemory, and slink:VkBindImageMemoryInfo (internal merge
request 3301).
* Make extension version numbers in `vk.xml` and extension appendices
consistent. In a few cases, we could not recover history at this
granularity, and left the summary of a version's change undefined
(internal merge request 3323).
* Fix invocation of `CodeInlineMacro` in the Ruby extension backing the
`code:` macro, which was delegating to the wrong base class (internal
merge request 3331).
* Modify `reg.py` to do a better job of recognizing equivalent <enum>
definitions.
* Add a `sortorder` attribute to XML feature and extension tags.
New Extensions
* `<<VK_AMD_device_coherent_memory>>`
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// Copyright (c) 2017-2019 Khronos Group. This work is licensed under a
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// Creative Commons Attribution 4.0 International License; see
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// http://creativecommons.org/licenses/by/4.0/
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include::meta/VK_EXT_headless_surface.txt[]
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*Last Modified Date*::
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2019-03-21
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*IP Status*::
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No known IP claims.
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*Contributors*::
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- Ray Smith, Arm
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The `VK_EXT_headless_surface` extension is an instance extension.
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It provides a mechanism to create slink:VkSurfaceKHR objects independently
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of any window system or display device.
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The presentation operation for a swapchain created from a headless surface
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is by default a no-op, resulting in no externally-visible result.
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Because there is no real presentation target, future extensions can layer on
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top of the headless surface to introduce arbitrary or customisable sets of
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restrictions or features.
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These could include features like saving to a file or restrictions to
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emulate a particular presentation target.
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This functionality is expected to be useful for application and driver
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development because it allows any platform to expose an arbitrary or
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customisable set of restrictions and features of a presentation engine.
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This makes it a useful portable test target for applications targeting a
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wide range of presentation engines where the actual target presentation
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engines might be scarce, unavailable or otherwise undesirable or
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inconvenient to use for general Vulkan application development.
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=== New Object Types
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None
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=== New Enum Constants
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* Extending elink:VkStructureType:
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** ename:VK_STRUCTURE_TYPE_HEADLESS_SURFACE_CREATE_INFO_EXT
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=== New Enums
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None
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=== New Structures
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* slink:VkHeadlessSurfaceCreateInfoEXT
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=== New Functions
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* flink:vkCreateHeadlessSurfaceEXT
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=== Issues
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None
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=== Version History
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* Revision 1, 2019-03-21 (Ray Smith)
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- Initial draft
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