* Update release number to 81.
Public Issues:
* Fix missing "`valid`" phrasing in some obscure cases (public pull
request 605).
* Replace improper use of cannot: referring to the implementation in the
description of the
<<features-limits-maxUpdateAfterBindDescriptorsInAllPools,
pname:maxUpdateAfterBindDescriptorsInAllPools>> limit (public pull
request 738).
* Reorder description of bits in elink:VkPipelineStageFlagBits and the
<<synchronization-pipeline-stages-supported, Supported pipeline stage
flags>> table to match their definition order (public pull request 740).
* Add description of ename:VK_BUFFER_USAGE_CONDITIONAL_RENDERING_BIT_EXT
to elink:VkBufferUsageFlagBits (public pull request 741).
* Fix value usage statement for slink:VkSubpassDependency stage mask
parameters (public pull request 742).
* Fix visible markup in registry schema document (public pull request
#745).
Internal Issues:
* Make the <<geometry-invocations, geometry shader invocation
description>> and <<shaders-geometry-execution, Geometry Shader
Execution>> descriptions consistent with other pipeline stages (internal
issue 1325).
* Mark the `VK_NV_glsl_shader` extension as deprecated.
* Adjust the per-instance vertex attribute offset formula specified by
`VK_EXT_vertex_attribute_divisor` for
slink:VkVertexInputBindingDivisorDescriptionEXT so that the interaction
between pname:firstInstance and pname:divisor matches the OpenGL
convention (internal issue 1333).
* Update release number to 79.
Public Issues:
* Add a note to the <<features-required-format-support, Required Format
Support>> section clarifying that the required formats don't depend on
the used flags (public issue 671).
* Add a valid usage statement for flink:vkUpdateDescriptors that was
previously described for slink:VkImageSubresourceRange, but not as a
valid usage statement (public issue 713).
* Modify implicit valid usage generator script to not emit 'must: not be
0' for a parameter that is a pointer to a flags field, such as
pname:pPeerMemoryFeatures (public issue 729).
Internal Issues:
* Add definitions of "`obsoleted`" and "`deprecated`", and modify the
definition of "`promoted`" in the <<glossary, Glossary>> (internal issue
988).
* Add language for integer texel output conversions (the conversion is
undefined) to the <<textures-output-format-conversion]] Texel Output
Format Conversion>> section. Simplify and clarify the floating-point
conversion language in the <<fundamentals-general, General
Requirements>> section and the new <<fundamentals-fp-conversion,
Floating-Point Format Conversions>> section, and remove obsolete
language in the format-specific floating-point sections (internal issue
1275).
* Add the elink:VkVendorId enumerated type to the Vulkan API / XML /
header, so reserved Khronos vendor IDs can be referred to symbolically
by clients. Note that only Khronos vendor IDs (e.g. non-PCI vendor IDs)
are defined (internal issue 1299).
* Fix typo in the <<fig-non-strict-lines, Non strict lines>> table
(internal issue 1315).
* Clean up and simplify the
<<features-formats-requiring-sampler-ycbcr-conversion, YCbCr format
properties>> table and use symbols consistently with other tables. Add a
column for the number of planes.
* Add code:Float16 to the <<spirvenv-capabilities-table, List of optional
SPIR-V capabilities>> for the `VK_AMD_gpu_shader_half_float` extension.
* Update release number to 72.
Github Issues:
* Restructure the repository to put the specification `Makefile` and
associated spec source material at the top level, `vk.xml` and
associated scripts material in `xml/`, and generated include and source
files in `include/vulkan/` and `src/ext_loader/`, respectively (public
issue 436).
* Add missing bullet point markup to flink:vkCmdCopyImage valid usage
statement, so it gets a VUID assigned (public issue 627).
* Fix broken links in a couple of extension appendices (public pull
request 665).
* Add the \<platform> tag to the index in section 4.1 of the registry
schema documentation, and add the protect= attribute of \<extension>
tags to the comments in `registry.rnc` (public issues 673, 678).
* Add missing valid usage statements for sparse image interactions to
flink:VkImageCreateInfo (public pull request 675).
* Fix improper usage and grammar of "`can: not`" (public pull request
681).
* Remove duplicate spec language and NOTE on present layout between the
flink:vkAcquireNextImageKHR and flink:vkAcquireNextImage2KHR commands
(public pull request 685).
* Fix some typos and markup issues (public pull request 689; public issues
642, 667, 687).
* Fix typo etext:VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_FENCE_FD_BIT ->
ename:VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_SYNC_FD_BIT in the
<<external-semaphore-handle-types-compatibility, External semaphore
handle types compatibility>> table (public pull request 691).
Internal Issues:
* Remove the need for the "`noautovalidity`" attribute on extension
structures in `vk.xml`. It is now implied by the "`structextends`"
attribute instead (internal issue 942).
* Replace uses of "`currently bound`" with "`bound`", since "`currently`"
is redundant and distracting, and add a corresponding rule to the style
guide (internal issue 993).
* Fixed subtle issues with the last updates to flink:vkAcquireNextImageKHR
language that had resulted in ambiguities (internal issue 1178).
* Make it clear that only one query of a given type is allowed at a time
by reordering valid usage statements for flink:vkCmdBeginQuery and
flink:vkCmdEndQuery, and removing redundant ones (internal issue 1213).
* Swapped OL1 and OL3 in `tessparamUL.svg` to match previous version, and
fixed where "`(no edge)`" appears (internal issue 1215).
Other Issues:
* Fixed a minor problem with the valid usage statement extraction script,
and corresponding markup in the spec source.
New Extensions:
* `VK_AMD_shader_core_properties`
* `VK_EXT_descriptor_indexing`
* `VK_NV_shader_subgroup_partitioned`
associated material at the top level, vk.xml and associated material in
xml/, and generated include and source files in include/vulkan/ and
src/ext_loader/, respectively (public issue 436).
Jon Leech