The Khronos registry contains specifications, header files, extension specifications, enumerant and function registries, and other related documentation for Khronos APIs, Languages, and related products.
The Khronos API Implementers Guide, available in HTML and PDF versions, provides guidelines for implementers of OpenGL ES, OpenVG and other API standards specified by the Khronos Group. The aim of these hints is to provide commonality between implementations to ease the logistical problems faced by developers using multiple different implementations of an API. One of the primary goals is to allow an application binary to run on top of multiple different OpenGL ES / OpenVG / EGL implementations on the same platform. Implementers are strongly urged to comply with these guidelines.
The registry is broken down into separate sections for each API. These sections include:
WebGL™ Registry (Note: the related TypedArray Registry defined functionality that is now part of the ECMAScript 2015 Language Specification, and has been removed from the Khronos website. Links to that registry now redirect to the corresponding section of the ECMAScript Specification.)
As of March 2017, we are no longer providing a single package containing collected header files. This package was usually long out of date in any event, and the individual APIs publish header files in their respective registry pages, or in github repositories linked from those pages. Normally header files are shipped as part of SDK and/or driver packages provided by operating system and/or hardware vendors.
Note that if you download individual header files, several of the APIs depend on the shared header file <KHR/khrplatform.h> , which defines common datatypes and calling convention macros.