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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) 2014-2019 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_KHR_sampler_mirror_clamp_to_edge.txt[]
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*Last Modified Date*::
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2019-08-17
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*Contributors*::
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- Tobias Hector, Imagination Technologies
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- Jon Leech, Khronos
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`VK_KHR_sampler_mirror_clamp_to_edge` extends the set of sampler address
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modes to include an additional mode
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(ename:VK_SAMPLER_ADDRESS_MODE_MIRROR_CLAMP_TO_EDGE) that effectively uses a
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texture map twice as large as the original image in which the additional
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half of the new image is a mirror image of the original image.
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This new mode relaxes the need to generate images whose opposite edges match
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by using the original image to generate a matching "`mirror image`".
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This mode allows the texture to be mirrored only once in the negative s, t,
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and r directions.
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=== New Enum Constants
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* Extending elink:VkSamplerAddressMode:
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** ename:VK_SAMPLER_ADDRESS_MODE_MIRROR_CLAMP_TO_EDGE
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=== Example
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Creating a sampler with the new address mode in each dimension
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[source,c++]
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----------------------------------------
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VkSamplerCreateInfo createInfo =
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{
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VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO // sType
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// Other members set to application-desired values
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};
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createInfo.addressModeU = VK_SAMPLER_ADDRESS_MODE_MIRROR_CLAMP_TO_EDGE;
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createInfo.addressModeV = VK_SAMPLER_ADDRESS_MODE_MIRROR_CLAMP_TO_EDGE;
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createInfo.addressModeW = VK_SAMPLER_ADDRESS_MODE_MIRROR_CLAMP_TO_EDGE;
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VkSampler sampler;
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VkResult result = vkCreateSampler(
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device,
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&createInfo,
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&sampler);
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----------------------------------------
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=== Issues
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1) Why are both KHR and core versions of the
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ename:VK_SAMPLER_ADDRESS_MODE_MIRROR_CLAMP_TO_EDGE token present?
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*RESOLVED*: This functionality was intended to be required in Vulkan 1.0.
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We realized shortly before public release that not all implementations could
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support it, and moved the functionality into an optional extension, but did
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not apply the KHR extension suffix.
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Adding a KHR-suffixed alias of the non-suffixed enum has been done to comply
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with our own naming rules.
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In a related change, before spec revision 1.1.121 this extension was
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hardwiring into the spec Makefile so it was always included with the
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Specification, even in the core-only versions.
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This has now been reverted, and it is treated as any other extension.
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=== Version History
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* Revision 1, 2016-02-16 (Tobias Hector)
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- Initial draft
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* Revision 2, 2019-08-14 (Jon Leech)
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- Add KHR-suffixed alias of non-suffixed enum.
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* Revision 3, 2019-08-17 (Jon Leech)
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- Add an issue explaining the reason for the extension API not being
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suffixed with KHR.
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