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 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
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.
- pname
- A
GLenumspecifying 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
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | No support [2] | Nightly build [1] | No support | No support | No support |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | No support | No support | No support | No support | No support | No support |
[1] WebGL 2 is enabled by default in Firefox Nightly. To enable it in a release version of Firefox, set the preference webgl.enable-prototype-webgl2 to true in about:config.
[2] To use an experimental implementation of WebGL 2 in Chrome, you have to start Chrome with the runtime flag --enable-unsafe-es3-apis.