This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The WebGL2RenderingContext.beginQuery() method of the WebGL 2 API starts an asynchronous query. The target parameter indicates which kind of query to begin.
Syntax
void gl.beginQuery(target, query);
Parameters
- target
- A
GLenumspecifying 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.
query- A
WebGLQueryobject for which to start the querying.
Return value
None.
Examples
var query = gl.createQuery(); gl.beginQuery(gl.ANY_SAMPLES_PASSED, query); // ...
Specifications
| Specification | Status | Comment |
|---|---|---|
| WebGL 2.0 The definition of 'beginQuery' in that specification. |
Editor's Draft | Initial definition. |
| OpenGL ES 3.0 The definition of 'glBeginQuery' 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.
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 56 | No | 51 | No | 43 | No |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | 58 | 58 | No | 51 | 43 | No | 7.0 |