WebGL2RenderingContext: beginQuery() method
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2021.
The WebGL2RenderingContext.beginQuery() method of the WebGL 2 API starts an asynchronous query. The
target parameter indicates which kind of query to begin.
Syntax
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, 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 (undefined).
Examples
const query = gl.createQuery();
gl.beginQuery(gl.ANY_SAMPLES_PASSED, query);
// …
Specifications
| Specification |
|---|
| WebGL 2.0 Specification # 3.7.12 |
Browser compatibility
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