* Bump API patch number and header version number to 68 for this update.
Github Issues:
* Added more details in the
<<extended-functionality-extensions-compatibility, Extension
Compatibility>> section, allowing explicit incompatibilities, and
simplify corresponding language in the style guide, which now defers to
the API Specification on this point (public issue 638).
* Fix typo in description of slink:VkCommandBufferLevel::pname:level
(public issue 651).
* Only include extension-dependent valid usage statement for
slink:VkImageSubresourceRange, and note that the extension names for
header files described in the <<boilerplate-wsi-header, Window
System-Specific Header Control>> section are only valid links, when the
specification being viewed is built with the corresponding extensions
enabled (public issue 652).
Internal Issues:
* Add language to elink:VkResult specifying that when commands return an
error, output parameter contents are undefined instead of unmodified
(except for pname:sType and pname:pNext). Note that this is a behavior
change. Add notes calling out slink:VkImageFormatProperties as an
exception (internal issue 1118).
* Add "`general-purpose`" to the style guide, and correct existing uses of
"`general purpose`" as an adjective (internal issue 1121).
* Add the ename:VK_DEBUG_REPORT_OBJECT_TYPE_VALIDATION_CACHE_EXT_EXT token
for the `VK_EXT_validation_cache` extension, following the same naming
pattern as other tokens in the extension, but keep the old
ename:VK_DEBUG_REPORT_OBJECT_TYPE_VALIDATION_CACHE_EXT token around for
backwards compatibility (internal issue 1126).
Other Issues:
* Specify that flink:vkCmdSetDiscardRectangleEXT does not affect copies or
clears, matching existing language for the scissor rectangle test.
* Move the <<boilerplate-sType, pname:sType>> definition from the
boilerplate appendix to the Fundamentals chapter, putting it together
with the valid usage of pname:sType rather than having the definition
split across two places.
* Inline all of the etext:Vk*Flags definitions, moving each one from the
boilerplate appendix to appear either after the corresponding
etext:Vk*FlagBits value if one is defined, or after the first structure
that includes them if not.
* Bump API patch number and header version number to 64 for this update.
Github Issues:
* Add chapter name to the PDF page footer (public pull request 458).
* Fix several mistaken references to the nonexistent etext:VK_DEVICE_LOST
status to etext:VK_ERROR_DEVICE_LOST (public pull request 502).
* Fix description of the tlink:PFN_vkDebugReportCallbackEXT debug report
callback function pointer to match the validation layer behavior (public
issue 534).
* Document experimental KHX extensions and alternate vendor author IDs
also ending in X in more detail in the <<extensions, Layers &
Extensions>> appendix, the extensions section of the style guide, and
the registry schema description document (public issues 536, 580).
* Fix references to ptext:pDepthStencil to properly refer to
pname:pDepthStencilState or pname:pRasterizationState as appropriate in
the slink:VkGraphicsPipelineCreateInfo description (public issue 542).
* Fix wrong parameter name in slink:VkPipelineMultisampleStateCreateInfo
valid usage (public pull request 571).
Internal Issues:
* Update the style guide to describe how to write LaTeX math expressions
in table cells (internal issue 908).
* Define how framebuffer-local dependencies work between subpasses with
the same or different numbers of samples, in the
slink:VkSubpassDescription and <<synchronization-framebuffer-regions,
Framebuffer Region Dependencies>> sections. This clarifies which samples
in an input attachment you are allowed to access after a
framebuffer-local dependency (internal issue 915).
* Specify which storage classes can have an initializer in the
<<spirvenv-module-validation, Validation Rules within a Module>> section
(internal issue 1023).
* Use "LOD" consistently for "level-of-detail", to eliminate spelling
inconsistencies. The term is already standardized in the Glossary
(internal issue 1027).
Other Issues:
* Fix false positives in Makefile dependencies when rules fail, by
deleting partially-made targets.
New Extensions:
* `VK_AMD_shader_info`
Jon Leech