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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The WebGLQuery interface is part of the WebGL 2 API and provides ways to asynchronously query for information. By default, occlusion queries and primitive queries are available.
Another kind of queries are disjoint timer queries, which allow you to measure performance and profiling of your GPU. Disjoint timer queries are available with the EXT_disjoint_timer_query extension only.
When working with WebGLQuery objects, the following methods of the WebGL2RenderingContext are useful:
WebGL2RenderingContext.createQuery()WebGL2RenderingContext.deleteQuery()WebGL2RenderingContext.isQuery()WebGL2RenderingContext.beginQuery()WebGL2RenderingContext.endQuery()WebGL2RenderingContext.getQuery()WebGL2RenderingContext.getQueryParameter()
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Examples
Creating a WebGLQuery object
in this example, gl must be a WebGL2RenderingContext. WebGLQuery objects are not available in WebGL 1.
var query = gl.createQuery();
Specifications
| Specification | Status | Comment |
|---|---|---|
| WebGL 2.0 The definition of 'WebGLQuery' in that specification. |
Editor's 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.
| Feature | Chrome | Firefox | Edge | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic Support | 56 | 51.0 | (No) | (No) | 43 | (No) |
| Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
| Basic Support | (No) | (No) | (No) | (No) | (No) | (No) | (No) |