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1ca0ea1ef0
* Bump API patch number and header version number to 22 for this update.
Github Issues:
* Translate the subpass self-dependency language into concrete
validity statements, and added a validity statement about the
restrictions on layout parameters (public issue 267).
* Add validity requirement that
slink:VkAttachmentDescription::pname:finalLayout and
slink:VkAttachmentReference::pname:layout must not be
ename:VK_IMAGE_LAYOUT_UNDEFINED or
ename:VK_IMAGE_LAYOUT_PREINITIALIZED (public issue 268).
* Clarify that slink:VkSubpassDescription::pname:pResolveAttachments
layouts are used. Make language consistent with other attachment
arrays (public issue 270).
* Changed 64-bit definition for
dname:VK_DEFINE_NON_DISPATCHABLE_HANDLE to work for x32 platform in
+vk.xml+ and the resulting +vulkan.h+ (public issue 282).
* Add missing error return code for
flink:vkEnumerateInstanceExtensionProperties and
flink:vkEnumerateDeviceExtensionProperties (public issue 285)
* Fix several cases of stext::VkStructName.memberName markup to
stext::VkStructName::pname:memberName, to match other usage in the
spec, and describe this markup in the style guide (public issue
286).
* Modified validity language generation script to avoid redundant
common ancestor language if covered by generic parent language, and
used `Both' instead of `Each' when appropriate (public issue 288).
Internal Issues:
* Add language about behavior of flink:vkAllocateDescriptorSets when
allocation fails due to fragmentation, a new error
ename:VK_ERROR_FRAGMENTED_POOL, and a Note explaining the situation
(internal issue 309).
* For the features of code:PointSize, code:ClipDistance, and
code:CullDistance, the SPIR-V capability is required to be declared
on use (read or write) rather than on decoration (internal issue
359).
* Have desktop versions of GLSL respect precision qualification
(code:mediump and code:lowp) when compiling for Vulkan. These will
get translated to SPIR-V's code:RelaxedPrecision decoration as they
do with OpenGL ES versions of GLSL (ESSL). The default precision of
all types is code:highp when using a desktop version (internal issue
360).
* Add validity statement for slink:VkImageCreateInfo specifying that
multisampled images must be two-dimensional, optimally tiled, and
with a single mipmap level (internal issue 369).
* Add validity statements to slink:VkImageViewCreateInfo disallowing
creation of images or image views with no supported features. Made
some slink:VkImageViewCreateInfo validity statements more precise
and consistent. Added a Note to the <<features,features>> chapter
about formats with no features (internal issue 371).
* Remove +manpages+ from default build targets. Nroff outputs
containing imbedded latexmath will not render properly. Fixing this
is a lot of work for limited use cases (internal issue 401).
Other Commits:
* Fix flink:vkRenderPassBeginInfo::pname:clearValueCount validity
statement to be based on attachment indices rather than the number
of cleared attachments
(Vulkan-LoaderAndValidationLayers/issues/601).
* Convert registry documentation from LaTeX to asciidoc source and
rename from +src/spec/readme.tex+ to +src/spec/registry.txt+.
* Fix lack of Oxford commas in validity language.
* Lots of cleanup of generator scripts and Makefiles to move extension
list for generator into the script arguments instead of the body of
genvk.py, and express better dependencies between XML, scripts, and
generated files.
103 lines
3.6 KiB
Plaintext
103 lines
3.6 KiB
Plaintext
// Copyright (c) 2014-2016 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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VkSubpassDependency(3)
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======================
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Name
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----
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VkSubpassDependency - Structure specifying a subpass dependency
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C Specification
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---------------
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// refBegin VkSubpassDependency - Structure specifying a subpass dependency
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The sname:VkSubpassDependency structure is defined as:
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include::../api/structs/VkSubpassDependency.txt[]
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Members
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-------
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* pname:srcSubpass and pname:dstSubpass are the subpass indices of the
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producer and consumer subpasses, respectively. pname:srcSubpass and
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pname:dstSubpass can: also have the special value
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ename:VK_SUBPASS_EXTERNAL. The source subpass must: always be a lower
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numbered subpass than the destination subpass (excluding external
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subpasses and
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<<synchronization-pipeline-barriers-subpass-self-dependencies,
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self-dependencies>>), so that the order of subpass descriptions is a
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valid execution ordering, avoiding cycles in the dependency graph.
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* pname:srcStageMask, pname:dstStageMask, pname:srcAccessMask,
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pname:dstAccessMask, and pname:dependencyFlags describe an
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<<synchronization-execution-and-memory-dependencies,execution and memory
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dependency>> between subpasses. The bits that can: be included in
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pname:dependencyFlags are:
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+
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--
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// refBegin VkDependencyFlagBits - Bitmask specifying dependencies between subpasses
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include::../api/enums/VkDependencyFlagBits.txt[]
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--
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** If pname:dependencyFlags contains ename:VK_DEPENDENCY_BY_REGION_BIT,
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then the dependency is by-region as defined in
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<<synchronization-execution-and-memory-dependencies,Execution And Memory
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Dependencies>>.
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Description
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-----------
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Each subpass dependency defines an execution and memory dependency
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between two sets of commands, with the second set depending on the first
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set. When pname:srcSubpass does not equal pname:dstSubpass then the first
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set of commands is:
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* All commands in the subpass indicated by pname:srcSubpass, if
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pname:srcSubpass is not ename:VK_SUBPASS_EXTERNAL.
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* All commands before the render pass instance, if pname:srcSubpass is
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ename:VK_SUBPASS_EXTERNAL.
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While the corresponding second set of commands is:
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* All commands in the subpass indicated by pname:dstSubpass, if
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pname:dstSubpass is not ename:VK_SUBPASS_EXTERNAL.
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* All commands after the render pass instance, if pname:dstSubpass is
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ename:VK_SUBPASS_EXTERNAL.
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When pname:srcSubpass equals pname:dstSubpass then the first set consists of
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commands in the subpass before a call to flink:vkCmdPipelineBarrier and the
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second set consists of commands in the subpass following that same call as
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described in the
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<<synchronization-pipeline-barriers-subpass-self-dependencies, Subpass
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Self-dependency>> section.
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The pname:srcStageMask, pname:dstStageMask, pname:srcAccessMask,
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pname:dstAccessMask, and pname:dependencyFlags parameters of the dependency
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are interpreted the same way as for other dependencies, as described in
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<<synchronization, Synchronization and Cache Control>>.
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include::../validity/structs/VkSubpassDependency.txt[]
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See Also
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--------
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elink:VkAccessFlags, elink:VkDependencyFlags, elink:VkPipelineStageFlags, slink:VkRenderPassCreateInfo
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Document Notes
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--------------
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For more information, see the Vulkan Specification at URL
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https://www.khronos.org/registry/vulkan/specs/1.0/xhtml/vkspec.html#VkSubpassDependency
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This page is extracted from the Vulkan Specification.
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Fixes and changes should be made to the Specification,not directly.
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include::footer.txt[]
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