WebGL2RenderingContext.beginQuery()
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
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.
Return value
None.
Examples
var 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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