WebGL2RenderingContext: fenceSync() 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.

Note: This feature is available in Web Workers.

The WebGL2RenderingContext.fenceSync() method of the WebGL 2 API creates a new WebGLSync object and inserts it into the GL command stream.

fenceSync(condition, flags)

condition: A GLenum specifying the condition that must be met to set the sync object's state to signaled. Must be gl.SYNC_GPU_COMMANDS_COMPLETE.
flags: A GLbitfield specifying a bitwise combination of flags controlling the behavior of the sync object. Must be 0 (exists for extensions only).

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

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

Specification
WebGL 2.0 Specification # 3.7.14

BCD tables only load in the browser