WebGL2RenderingContext.getQuery

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 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 above, but less accurate and faster version.
• gl.TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN: Number of primitives that are written to transform feedback buffers.

pname

A GLenum specifying the query object target. Must be gl.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

See also

• WebGLQuery