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 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 | Status | Comment |
---|---|---|
WebGL 2.0 The definition of 'beginQuery' in that specification. |
Editor's Draft | Initial definition. |
OpenGL ES 3.0 The definition of 'glBeginQuery' in that specification. |
Standard | Man page of the (similar) OpenGL API. |
Browser compatibility
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