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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/XRWebGLBinding/getSubImage below:

XRWebGLBinding: getSubImage() method - Web APIs

Limited availability

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The getSubImage() method of the XRWebGLBinding interface returns a XRWebGLSubImage object representing the WebGL texture to render.

getSubImage(layer, frame)
getSubImage(layer, frame, eye)

layer

The XRCompositionLayer to use for rendering (can be all types of XRCompositionLayer objects except XRProjectionLayer, see XRWebGLBinding.getViewSubImage() for rendering projection layers).

frame

The XRFrame frame to use for rendering.

eye Optional

An optional XRView.eye indicating which view's eye to use for rendering. Possible values:

left

The XRView represents the point-of-view of the viewer's left eye.

right

The view represents the viewer's right eye.

none

The view describes a monoscopic view, or the view otherwise doesn't represent a particular eye's point-of-view. Defaults to none.

A XRWebGLSubImage object.

A TypeError is thrown,

• if layer is not in the session's layer array.
• if layer is a XRProjectionLayer.
• if the layer's layout property is default.
• if the layer's layout property is stereo and eye is none.

The following example renders an XRQuadLayer.

const xrGlBinding = new XRWebGLBinding(xrSession, gl);
const quadLayer = xrGlBinding.createQuadLayer({
  space: xrReferenceSpace,
  viewPixelWidth: 512,
  viewPixelHeight: 512,
});

// Position 2 meters away from the origin with a width and height of 1.5 meters
quadLayer.transform = new XRRigidTransform({ z: -2 });
quadLayer.width = 1.5;
quadLayer.height = 1.5;

const framebuffer = gl.createFramebuffer();
xrSession.updateRenderState({ layers: [quadLayer] });
xrSession.requestAnimationFrame(onXRFrame);

function onXRFrame(time, xrFrame) {
  xrSession.requestAnimationFrame(onXRFrame);

  gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
  let subImage = xrGlBinding.getSubImage(quadLayer, xrFrame);
  gl.framebufferTexture2D(
    gl.FRAMEBUFFER,
    gl.COLOR_ATTACHMENT0,
    subImage.colorTexture,
    0,
  );
  let viewport = subImage.viewport;
  gl.viewport(viewport.x, viewport.y, viewport.width, viewport.height);

  // Render content for the quad layer
}

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