WebGL2RenderingContext: isSync() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2021.

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

isSync(sync)

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.

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

// …

gl.isSync(sync);

Specification
WebGL 2.0 Specification # 3.7.14

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