Web/API/EXT disjoint timer query

The EXT_disjoint_timer_query extension is part of the WebGL API and provides a way to measure the duration of a set of GL commands, without stalling the rendering pipeline.

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions in the WebGL tutorial.

Availability: This extension should be available in WebGL1 contexts only. EXT_disjoint_timer_query_webgl2 is available in WebGL 2 contexts .

In WebGL 2, the getQueryObject was renamed to getQueryParameter. In WebGL 2, other queries (such as occlusion queries and primitive queries) are possible using WebGLQuery objects.

Types

This extension exposes a new type:

GLuint64EXT: Unsigned 64-bit integer number.

Constants

This extension exposes seven new constants.

ext.QUERY_COUNTER_BITS_EXT: A GLint indicating the number of bits used to hold the query result for the given target.
ext.CURRENT_QUERY_EXT: A WebGLQuery object, which is the currently active query for the given target.
ext.QUERY_RESULT_EXT: A GLuint64EXT containing the query result.
ext.QUERY_RESULT_AVAILABLE_EXT: A GLboolean indicating whether or not a query result is available.
ext.TIME_ELAPSED_EXT: Elapsed time (in nanoseconds).
ext.TIMESTAMP_EXT: The current time.
ext.GPU_DISJOINT_EXT: A GLboolean indicating whether or not the GPU performed any disjoint operation.

Methods

This extension exposes eight new methods.

ext.createQueryEXT(): Creates a new WebGLQuery.
ext.deleteQueryEXT(): Deletes a given WebGLQuery.
ext.isQueryEXT(): Returns true if a given object is a WebGLQuery.
ext.beginQueryEXT(): The timer starts when all commands prior to beginQueryEXT have been fully executed.
ext.endQueryEXT(): The timer stops when all commands prior to endQueryEXT have been fully executed.
ext.queryCounterEXT(): Records the current time into the corresponding query object.
ext.getQueryEXT(): Returns information about a query target.
ext.getQueryObjectEXT(): Return the state of a query object.

Examples

var ext = gl.getExtension('EXT_disjoint_timer_query');

Specifications

Specification	Status	Comment
EXT_disjoint_timer_queryThe definition of 'EXT_disjoint_timer_query' in that specification.	Working Draft	Initial definition.

Browser compatibility

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`EXT_disjoint_timer_query`	Chrome No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Edge No support No	Firefox No support 51 — 59 Notes' No support 51 — 59 Notes' Notes' Removed due to the GLitch exploit.	IE No support No	Opera No support 34 — 52 Notes' No support 34 — 52 Notes' Notes' Removed due to the GLitch exploit.	Safari No support No	WebView Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Chrome Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Firefox Android No support No	Opera Android No support 34 — 47 Notes' No support 34 — 47 Notes' Notes' Removed due to the GLitch exploit.	Safari iOS No support No	Samsung Internet Android No support 5.0 — 9.0 Notes' No support 5.0 — 9.0 Notes' Notes' Removed due to the GLitch exploit.
`beginQueryEXT`	Chrome No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Edge No support No	Firefox No support 51 — 59 Notes' No support 51 — 59 Notes' Notes' Removed due to the GLitch exploit.	IE No support No	Opera No support 34 — 52 Notes' No support 34 — 52 Notes' Notes' Removed due to the GLitch exploit.	Safari No support No	WebView Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Chrome Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Firefox Android No support No	Opera Android No support 34 — 47 Notes' No support 34 — 47 Notes' Notes' Removed due to the GLitch exploit.	Safari iOS No support No	Samsung Internet Android No support 5.0 — 9.0 Notes' No support 5.0 — 9.0 Notes' Notes' Removed due to the GLitch exploit.
`createQueryEXT`	Chrome No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Edge No support No	Firefox No support 51 — 59 Notes' No support 51 — 59 Notes' Notes' Removed due to the GLitch exploit.	IE No support No	Opera No support 34 — 52 Notes' No support 34 — 52 Notes' Notes' Removed due to the GLitch exploit.	Safari No support No	WebView Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Chrome Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Firefox Android No support No	Opera Android No support 34 — 47 Notes' No support 34 — 47 Notes' Notes' Removed due to the GLitch exploit.	Safari iOS No support No	Samsung Internet Android No support 5.0 — 9.0 Notes' No support 5.0 — 9.0 Notes' Notes' Removed due to the GLitch exploit.
`deleteQueryEXT`	Chrome No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Edge No support No	Firefox No support 51 — 59 Notes' No support 51 — 59 Notes' Notes' Removed due to the GLitch exploit.	IE No support No	Opera No support 34 — 52 Notes' No support 34 — 52 Notes' Notes' Removed due to the GLitch exploit.	Safari No support No	WebView Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Chrome Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Firefox Android No support No	Opera Android No support 34 — 47 Notes' No support 34 — 47 Notes' Notes' Removed due to the GLitch exploit.	Safari iOS No support No	Samsung Internet Android No support 5.0 — 9.0 Notes' No support 5.0 — 9.0 Notes' Notes' Removed due to the GLitch exploit.
`endQueryEXT`	Chrome No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Edge No support No	Firefox No support 51 — 59 Notes' No support 51 — 59 Notes' Notes' Removed due to the GLitch exploit.	IE No support No	Opera No support 34 — 52 Notes' No support 34 — 52 Notes' Notes' Removed due to the GLitch exploit.	Safari No support No	WebView Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Chrome Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Firefox Android No support No	Opera Android No support 34 — 47 Notes' No support 34 — 47 Notes' Notes' Removed due to the GLitch exploit.	Safari iOS No support No	Samsung Internet Android No support 5.0 — 9.0 Notes' No support 5.0 — 9.0 Notes' Notes' Removed due to the GLitch exploit.
`getQueryEXT`	Chrome No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Edge No support No	Firefox No support 51 — 59 Notes' No support 51 — 59 Notes' Notes' Removed due to the GLitch exploit.	IE No support No	Opera No support 34 — 52 Notes' No support 34 — 52 Notes' Notes' Removed due to the GLitch exploit.	Safari No support No	WebView Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Chrome Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Firefox Android No support No	Opera Android No support 34 — 47 Notes' No support 34 — 47 Notes' Notes' Removed due to the GLitch exploit.	Safari iOS No support No	Samsung Internet Android No support 5.0 — 9.0 Notes' No support 5.0 — 9.0 Notes' Notes' Removed due to the GLitch exploit.
`getQueryObjectEXT`	Chrome No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Edge No support No	Firefox No support 51 — 59 Notes' No support 51 — 59 Notes' Notes' Removed due to the GLitch exploit.	IE No support No	Opera No support 34 — 52 Notes' No support 34 — 52 Notes' Notes' Removed due to the GLitch exploit.	Safari No support No	WebView Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Chrome Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Firefox Android No support No	Opera Android No support 34 — 47 Notes' No support 34 — 47 Notes' Notes' Removed due to the GLitch exploit.	Safari iOS No support No	Samsung Internet Android No support 5.0 — 9.0 Notes' No support 5.0 — 9.0 Notes' Notes' Removed due to the GLitch exploit.
`isQueryEXT`	Chrome No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Edge No support No	Firefox No support 51 — 59 Notes' No support 51 — 59 Notes' Notes' Removed due to the GLitch exploit.	IE No support No	Opera No support 34 — 52 Notes' No support 34 — 52 Notes' Notes' Removed due to the GLitch exploit.	Safari No support No	WebView Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Chrome Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Firefox Android No support No	Opera Android No support 34 — 47 Notes' No support 34 — 47 Notes' Notes' Removed due to the GLitch exploit.	Safari iOS No support No	Samsung Internet Android No support 5.0 — 9.0 Notes' No support 5.0 — 9.0 Notes' Notes' Removed due to the GLitch exploit.
`queryCounterEXT`	Chrome No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Edge No support No	Firefox No support 51 — 59 Notes' No support 51 — 59 Notes' Notes' Removed due to the GLitch exploit.	IE No support No	Opera No support 34 — 52 Notes' No support 34 — 52 Notes' Notes' Removed due to the GLitch exploit.	Safari No support No	WebView Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Chrome Android No support 47 — 65 Notes' No support 47 — 65 Notes' Notes' Removed due to the GLitch exploit.	Firefox Android No support No	Opera Android No support 34 — 47 Notes' No support 34 — 47 Notes' Notes' Removed due to the GLitch exploit.	Safari iOS No support No	Samsung Internet Android No support 5.0 — 9.0 Notes' No support 5.0 — 9.0 Notes' Notes' Removed due to the GLitch exploit.

Legend

No support: No support
See implementation notes.': See implementation notes.