mirror of
https://github.com/status-im/Vulkan-Docs.git
synced 2025-02-17 08:46:32 +00:00
ce60b9c887
* Vulkan 1.1 initial release. Bump API patch number and header version
number to 70 for this update. The patch number will be used for both
Vulkan 1.1 and Vulkan 1.0 updates, and continues to increment
continuously from the previous Vulkan 1.0.69 update.
NOTE: We are not publishing an updated 1.0.70 specification, or 1.1
reference pages, along with 1.1.70. There are still minor issues to work
out with those build targets. However, we will soon generate all three
types of documents as part of the regular spec update cycle.
NOTE: The GitHub KhronosGroup/Vulkan-Docs repository now maintains the
current specification in the `master` branch. The `1.0` branch is out of
date and will not be maintained, since we will be generating both 1.1
and 1.0 specifications from the `master` branch in the future.
Github Issues:
* Clarify how mapped memory ranges are flushed in
flink:vkFlushMappedMemoryRanges (public issue 127).
* Specify that <<synchronization-pipeline-stages, Pipeline Stages>> are a
list of tasks that each command performs, rather than necessarily being
discrete pieces of hardware that one task flows through. Add a
"`synchronization command`" pipeline type which all synchronization
command execute (it's just TOP + BOTTOM), with an explanatory note
(public issue 554).
Internal Issues:
* Regenerate all images used in the spec in Inkscape with a consistent
look-and-feel, and adjust image size attributes so they're all legible,
and not too large with respect to the spec body text (internal issue
701).
* Document in the <<extensions,extensions>> appendix and in the style
guide that `KHX` extensions are no longer supported or used in the
Vulkan 1.1 timeframe (internal issue 714).
* Remove the leftover equations_temp directory after PDF build completes
(internal issue 925).
* Update the <<credits, Credits (Informative)>> appendix to include
contributors to Vulkan 1.1, and to list them according to the API
version(s) they contributed to (internal issue 987).
* Add a NOTE to the introduction explaining that interfaces defined by
extensions which were promoted to Vulkan 1.1 are now expressed as
aliases of the Vulkan 1.1 type (internal issue 991).
* Instrument spec source conditionals so spec can be built with 1.1
features, extensions promoted to 1.1, or both (internal issues 992,
998).
* Modify the XML schema and tools to support explicit aliasing of types,
structures, and commands, and use this to express the promotion of 1.0
extensions to 1.1 core features, by making the extension interfaces
aliases of the core features they were promoted to. Mark up promoted
interfaces to allow still generating 1.0 + extension specifications
(internal issue 991).
* Platform names, along with corresponding preprocessor symbols to enable
extensions specific to those platforms, are now reserved in vk.xml using
the <platform> tag. Update the registry schema and schema specification
to match (internal issue 1011).
* Updated the <<textures-texel-replacement, Texel Replacement>> section to
clarify that reads from invalid texels for image resources result in
undefined values (internal issue 1014).
* Modify description of patch version so it continues to increment across
minor version changes (internal issue 1033).
* Clarify and unify language describing physical device-level core and
extension functionality in the <<fundamentals-validusage-extensions,
Valid Usage for Extensions>>, <<fundamentals-validusage-versions, Valid
Usage for Newer Core Versions>>, <<initialization-functionpointers
Command Function Pointers>>, <<initialization-phys-dev-extensions,
Extending Physical Device From Device Extensions>>
<<extended-functionality-instance-extensions-and-devices, Instance
Extensions and Device Extensions>> sections and for
flink:vkGetPhysicalDeviceImageFormatProperties2. This documents that
instance-level functionality is tied to the loader, and independent of
the ICD; physical device-level functionality is tied to the ICD, and
associated with device extensions; physical devices are treated more
uniformly between core and extensions; and instance and physical
versions can be different (internal issue 1048).
* Updated the <<commandbuffers-lifecycle, Command Buffer Lifecycle>>
section to clarify the ability for pending command buffers to transition
to the invalid state after submission, and add a command buffer
lifecycle diagram (internal issue 1050).
* Clarify that some flink:VkDescriptorUpdateTemplateCreateInfo parameters
are ignored when push descriptors are not supported (internal issue
1054).
* Specify that flink:vkCreateImage will return an error if the image is
too large, in a NOTE in the slink:VkImageFormatProperties description
(internal issue 1078).
* Remove near-duplicate NOTEs about when to query function pointers
dynamically in the <<initialization, Initialization>> chapter and
replace by extending the NOTE in the <<fundamentals-abi, Application
Binary Interface>> section (internal issue 1085).
* Restore missing references to "`Sparse Resource Features`" in the
flink:VkBufferCreateFlagBits description (internal issue 1086).
* Tidy up definitions of descriptor types in the `GL_KHR_vulkan_glsl`
specification, the <<descriptorsets, Resource Descriptors>> section and
its subsections, and the <<interfaces-resources-descset, Descriptor Set
Interface>> for consistency, reduction of duplicate information, and
removal of GLSL correspondance/examples (internal issue 1090).
* Correctly describe code:PrimitiveId as an Input for tessellation control
and evaluation shaders, not an Output (internal issue 1109).
* Relax the requirements on chroma offsets for nearest filtering in
<<textures-implict-reconstruction, Implicit Reconstruction>> (internal
issue 1116).
Other Issues:
* Clarify the intended relationship between specification language and
certain terms defined in the Khronos Intellectual Property Rights
policy. Specific changes include:
** Rewrote IP/Copyright preamble and introduction to better agree with
normative language both as laid out in the introduction, and the
Khronos IPR policy.
** Added notion of fully informative sections, which are now tagged with
"`(Informative)`" in their titles.
** Removed non-normative uses of the phrase "`not required`"
** Clarified the distinction between terms "`optional`" and "`not
required:`" as they relate to the IPR Policy, and updated specification
text to use terms consistent with the intent.
** Reduced additions to RFC 2119, and ensured the specification agreed
with the leaner language.
** Removed the terms "`hardware`", "`software`", "`CPU`", and "`GPU`" from
normative text.
** Moved several paragraphs that should not have been normative to
informative notes.
** Clarified a number of definitions in the Glossary.
** Updated the document writing guide to match new terminology changes.
* Explicitly state in the <<fundamentals-objectmodel-lifetime-acquire,
application memory lifetime>> language that that for objects other than
descriptor sets, a slink:VkDescriptorSetLayout object used in the
creation of another object (such as slink:VkPipelineLayout or
slink:VkDescriptorUpdateTemplateKHR) is only in use during the creation
of that object and can be safely destroyed afterwards.
* Updated the <<textures-scale-factor, Scale Factor Operation>> section to
use the ratio of anisotropy, rather than the integer sample rate, to
perform the LOD calculation. The spec still allows use of the sample
rate as the value used to calculate the LOD, but no longer requires it.
* Update `vulkan_ext.c` to include all platform-related definitions from
the Vulkan platform headers, following the split of the headers into
platform-specific and non-platform-specific files.
* Fix bogus anchor name in the <<commandbuffers, Command Buffers>> chapter
which accidentally duplicated an anchor in the pipelines chapter. There
were no reference to this anchor, fortunately.
* Add valid usage statement for slink:VkWriteDescriptorSet and
slink:VkCopyDescriptorSet requiring that the slink:VkDescriptorSetLayout
used to allocate the source and destination sets must not have been
destroyed at the time flink:vkUpdateDescriptorSets is called.
* Document mapping of subgroup barrier functions to SPIR-V, and clarify a
place where subgroupBarrier sounds like it's execution-only in the
standalone `GL_KHR_shader_subgroup` specification.
* Use an HTML stylesheet derived from the Asciidoctor `colony` theme, with
the default Arial font family replaced by the sans-serif Noto font
family.
* Numerous minor updates to README.adoc, build scripts, Makefiles, and
registry and style guide specifications to support Vulkan 1.1 outputs,
use them as defaults, and remove mention of `KHX` extensions, which are
no longer supported.
New Extensions:
* `VK_EXT_vertex_attrib_divisor`
152 lines
6.0 KiB
Plaintext
152 lines
6.0 KiB
Plaintext
// Copyright (c) 2015-2018 Khronos Group. This work is licensed under a
|
|
// Creative Commons Attribution 4.0 International License; see
|
|
// http://creativecommons.org/licenses/by/4.0/
|
|
|
|
|
|
[[introduction]]
|
|
= Introduction
|
|
|
|
This document, referred to as the "`Vulkan Specification`" or just the
|
|
"`Specification`" hereafter, describes the Vulkan Application Programming
|
|
Interface (API).
|
|
Vulkan is a http://www.open-std.org/jtc1/sc22/wg14/www/standards[C99] API
|
|
designed for explicit control of low-level graphics and compute
|
|
functionality.
|
|
|
|
The canonical version of the Specification is available in the official
|
|
http://www.khronos.org/registry/vulkan/[Vulkan Registry]
|
|
(http://www.khronos.org/registry/vulkan/).
|
|
The source files used to generate the Vulkan specification are stored in the
|
|
https://github.com/KhronosGroup/Vulkan-Docs[Vulkan Documentation Repository]
|
|
(https://github.com/KhronosGroup/Vulkan-Docs).
|
|
The source repository additionally has a public issue tracker and allows the
|
|
submission of pull requests that improve the specification.
|
|
|
|
|
|
[[introduction-conventions]]
|
|
== Document Conventions
|
|
|
|
The Vulkan specification is intended for use by both implementors of the API
|
|
and application developers seeking to make use of the API, forming a
|
|
contract between these parties.
|
|
Specification text may address either party; typically the intended audience
|
|
can be inferred from context, though some sections are defined to address
|
|
only one of these parties.
|
|
(For example, <<fundamentals-validusage>> sections only address application
|
|
developers).
|
|
Any requirements, prohibitions, recommendations or options defined by
|
|
<<introduction-normative-terminology, normative terminology>> are imposed
|
|
only on the audience of that text.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
Structure and enumerated types defined in extensions that were promoted to
|
|
core in Vulkan 1.1 are now defined in terms of the equivalent Vulkan 1.1
|
|
interfaces.
|
|
This affects the Vulkan Specification, the Vulkan header files, and the
|
|
corresponding XML Registry.
|
|
====
|
|
|
|
|
|
[[introduction-normative-terminology]]
|
|
=== Normative Terminology
|
|
|
|
Within this specification, the key words *must*, *required*, *should*,
|
|
*recommended*, *may*, and *optional* are to be interpreted as described in
|
|
http://www.ietf.org/rfc/rfc2119.txt[RFC 2119 - Key words for use in RFCs to
|
|
Indicate Requirement Levels] (http://www.ietf.org/rfc/rfc2119.txt).
|
|
These key words are highlighted in the specification for clarity.
|
|
In text addressing application developers, their use expresses requirements
|
|
that apply to application behavior.
|
|
In text addressing implementors, their use expresses requirements that apply
|
|
to implementations.
|
|
|
|
In text addressing application developers, the additional key words *can*
|
|
and *cannot* are to be interpreted as describing the capabilities of an
|
|
application, as follows:
|
|
|
|
*can*::
|
|
This word means that the application is able to perform the action
|
|
described.
|
|
|
|
*cannot*::
|
|
This word means that the API and/or the execution environment provide no
|
|
mechanism through which the application can express or accomplish the action
|
|
described.
|
|
|
|
These key words are never used in text addressing implementors.
|
|
|
|
[NOTE]
|
|
.Note
|
|
==================
|
|
There is an important distinction between *cannot* and *must not*, as used
|
|
in this Specification.
|
|
*Cannot* means something the application literally is unable to express or
|
|
accomplish through the API, while *must not* means something that the
|
|
application is capable of expressing through the API, but that the
|
|
consequences of doing so are undefined and potentially unrecoverable for the
|
|
implementation.
|
|
==================
|
|
|
|
Unless otherwise noted in the section heading, all sections and appendices
|
|
in this document are normative.
|
|
|
|
|
|
[[introduction-technical-terminology]]
|
|
=== Technical Terminology
|
|
|
|
The Vulkan Specification makes use of common engineering and graphics terms
|
|
such as *Pipeline*, *Shader*, and *Host* to identify and describe Vulkan API
|
|
constructs and their attributes, states, and behaviors.
|
|
The <<glossary,Glossary>> defines the basic meanings of these terms in the
|
|
context of the Specification.
|
|
The Specification text provides fuller definitions of the terms and may
|
|
elaborate, extend, or clarify the <<glossary,Glossary>> definitions.
|
|
When a term defined in the <<glossary,Glossary>> is used in normative
|
|
language within the Specification, the definitions within the Specification
|
|
govern and supersede any meanings the terms may have in other technical
|
|
contexts (i.e. outside the Specification).
|
|
|
|
|
|
[[introduction-normative-references]]
|
|
=== Normative References
|
|
|
|
References to external documents are considered normative references if the
|
|
Specification uses any of the normative terms defined in
|
|
<<introduction-normative-terminology>> to refer to them or their
|
|
requirements, either as a whole or in part.
|
|
|
|
The following documents are referenced by normative sections of the
|
|
specification:
|
|
|
|
[[ieee-754]]
|
|
_IEEE Standard for Floating-Point Arithmetic_, IEEE Std 754-2008,
|
|
http://dx.doi.org/10.1109/IEEESTD.2008.4610935, August, 2008.
|
|
|
|
[[data-format]] A. Garrard, _Khronos Data Format Specification, version
|
|
1.2_,
|
|
https://www.khronos.org/registry/DataFormat/specs/1.2/dataformat.1.2.html,
|
|
September, 2017.
|
|
|
|
// If the author name is placed on a standalone line, we see the mysterious
|
|
// asciidoc error 'list item index: expected 2 got 10'. Apparently the 'A.'
|
|
// of the previous paragraph and the 'J.' of this one get misinterpreted.
|
|
|
|
[[spirv-extended]] J. Kessenich, _SPIR-V Extended Instructions for GLSL,
|
|
Version 1.00_, https://www.khronos.org/registry/spir-v/, February 10, 2016.
|
|
|
|
[[spirv-spec]] J. Kessenich and B. Ouriel, _The Khronos SPIR-V
|
|
Specification, Version 1.00_, https://www.khronos.org/registry/spir-v/,
|
|
February 10, 2016.
|
|
|
|
[[vulkan-styleguide]] J. Leech and T. Hector, _Vulkan Documentation and
|
|
Extensions: Procedures and Conventions_,
|
|
https://www.khronos.org/registry/vulkan/, July 11, 2016
|
|
|
|
[[LoaderAndValidationLayers]]
|
|
_Vulkan Loader Specification and Architecture Overview_,
|
|
https://github.com/KhronosGroup/Vulkan-LoaderAndValidationLayers/blob/master/loader/LoaderAndLayerInterface.md,
|
|
August, 2016.
|
|
|