This document, referred to as the “Vulkan Specification” or just the “Specification” hereafter, describes the Vulkan Application Programming Interface (API). Vulkan is a C99 API designed for explicit control of low-level graphics and compute functionality.
The canonical version of the Specification is available in the official Vulkan Registry (http://www.khronos.org/registry/vulkan/). The source files used to generate the Vulkan specification are stored in the 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.
1.1. 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, Valid Usage sections only address application developers). Any requirements, prohibitions, recommendations or options defined by normative terminology are imposed only on the audience of that text.
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.
1.1.1. Normative Terminology
Within this specification, the key words must, required, should, recommended, may, and optional are to be interpreted as described in 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:
This word means that the application is able to perform the action described.
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.
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.
1.1.2. 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 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 definitions. When a term defined in the 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).
1.1.3. Normative References
References to external documents are considered normative references if the Specification uses any of the normative terms defined in 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 Standard for Floating-Point Arithmetic, IEEE Std 754-2008, http://dx.doi.org/10.1109/IEEESTD.2008.4610935, August, 2008.
A. Garrard, Khronos Data Format Specification, version 1.2, https://www.khronos.org/registry/DataFormat/specs/1.2/dataformat.1.2.html, September, 2017.
J. Kessenich, SPIR-V Extended Instructions for GLSL, Version 1.00, https://www.khronos.org/registry/spir-v/, February 10, 2016.
J. Kessenich, B. Ouriel, and R. Krisch, SPIR-V Specification, Version 1.3, Revision 2, Unified, https://www.khronos.org/registry/spir-v/, May 11, 2018.
J. Leech and T. Hector, Vulkan Documentation and Extensions: Procedures and Conventions, https://www.khronos.org/registry/vulkan/specs/1.1/styleguide.html
Vulkan Loader Specification and Architecture Overview, https://github.com/KhronosGroup/Vulkan-Loader/blob/master/loader/LoaderAndLayerInterface.md, August, 2016.