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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_query
The definition of 'EXT_disjoint_timer_query' in that specification.
Working Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge No support NoFirefox No support 51 — 63
Notes
No support 51 — 63
Notes
Notes Removed due to the GLitch exploit.
IE ? Opera ? Safari ? WebView Android ? Chrome Android No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge Mobile No support NoFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support 5.0
createQueryEXTChrome No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge No support NoFirefox No support 51 — 63
Notes
No support 51 — 63
Notes
Notes Removed due to the GLitch exploit.
IE ? Opera ? Safari ? WebView Android ? Chrome Android No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge Mobile No support NoFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support 5.0
deleteQueryEXTChrome No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge No support NoFirefox No support 51 — 63
Notes
No support 51 — 63
Notes
Notes Removed due to the GLitch exploit.
IE ? Opera ? Safari ? WebView Android ? Chrome Android No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge Mobile No support NoFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support 5.0
isQueryEXTChrome No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge No support NoFirefox No support 51 — 63
Notes
No support 51 — 63
Notes
Notes Removed due to the GLitch exploit.
IE ? Opera ? Safari ? WebView Android ? Chrome Android No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge Mobile No support NoFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support 5.0
beginQueryEXTChrome No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge No support NoFirefox No support 51 — 63
Notes
No support 51 — 63
Notes
Notes Removed due to the GLitch exploit.
IE ? Opera ? Safari ? WebView Android ? Chrome Android No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge Mobile No support NoFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support 5.0
endQueryEXTChrome No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge No support NoFirefox No support 51 — 63
Notes
No support 51 — 63
Notes
Notes Removed due to the GLitch exploit.
IE ? Opera ? Safari ? WebView Android ? Chrome Android No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge Mobile No support NoFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support 5.0
queryCounterEXTChrome No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge No support NoFirefox No support 51 — 63
Notes
No support 51 — 63
Notes
Notes Removed due to the GLitch exploit.
IE ? Opera ? Safari ? WebView Android ? Chrome Android No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge Mobile No support NoFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support 5.0
getQueryEXTChrome No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge No support NoFirefox No support 51 — 63
Notes
No support 51 — 63
Notes
Notes Removed due to the GLitch exploit.
IE ? Opera ? Safari ? WebView Android ? Chrome Android No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge Mobile No support NoFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support 5.0
getQueryObjectEXTChrome No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge No support NoFirefox No support 51 — 63
Notes
No support 51 — 63
Notes
Notes Removed due to the GLitch exploit.
IE ? Opera ? Safari ? WebView Android ? Chrome Android No support 47 — 65
Notes
No support 47 — 65
Notes
Notes Removed due to the GLitch exploit.
Edge Mobile No support NoFirefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android Full support 5.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.

See also

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