The WebGL2RenderingContext.beginQuery() method of the WebGL 2 API starts an asynchronous query. The target parameter indicates which kind of query to begin.

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, but less accurate and faster version.

gl.TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN

Number of primitives that are written to transform feedback buffers.

query

A WebGLQuery object for which to start the querying.

None (undefined).

• WebGLQuery