This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The WebGL2RenderingContext.getQuery()
method of the WebGL 2 API returns the currently active WebGLQuery
for the target
, or null
.
Syntax
WebGLQuery gl.getQuery(target, pname);
Parameters
- target
- A
GLenum
specifying the target of the query. Possible values:gl.ANY_SAMPLES_PASSED
: Specifies an occlusion query: these queries detect whether an object is visible (whether the scoped drawing commands pass the depth test and if so, how many samples pass).gl.ANY_SAMPLES_PASSED_CONSERVATIVE
: Same as above above, but less accurate and faster version.gl.TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN
: Number of primitives that are written to transform feedback buffers.
- pname
- A
GLenum
specifying the query object target. Must begl.CURRENT_QUERY
.
Return value
A WebGLQuery
object.
Examples
var currentQuery = gl.getQuery(gl.ANY_SAMPLES_PASSED, gl.CURRENT_QUERY);
Specifications
Specification | Status | Comment |
---|---|---|
WebGL 2.0 The definition of 'getQuery' in that specification. |
Editor's Draft | Initial definition. |
OpenGL ES 3.0 The definition of 'glGetQueryiv' in that specification. |
Standard | Man page of the (similar) OpenGL API. |
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.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
getQuery | Chrome Full support 56 | Edge Full support 79 | Firefox Full support 51 | IE No support No | Opera Full support 43 | Safari No support No | WebView Android Full support 58 | Chrome Android Full support 58 | Firefox Android Full support 51 | Opera Android Full support 43 | Safari iOS No support No | Samsung Internet Android Full support 7.0 |
Legend
- Full support
- Full support
- No support
- No support