WebGL2RenderingContext.isSync()

The WebGL2RenderingContext.isSync() method of the WebGL 2 API returns true if the passed object is a valid WebGLSync object.

sync

A WebGLSync object to test.

A GLboolean indicating whether the given object is a valid WebGLSync object (true) or not (false).

gl must be a WebGL2RenderingContext. WebGLSync objects are not available in WebGL 1.

var sync = gl.fenceSync(gl.SYNC_GPU_COMMANDS_COMPLETE, 0);

// ...

gl.isSync(sync);

• WebGLSync