[Webkit-unassigned] [Bug 219023] Blank glReadPixels since iOS 14.2

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219023

--- Comment #3 from paul at sketchfab.com ---
1) is it reading the default Framebuffer or user-defined Framebuffer?
It's user defined

2) What format is the texture attachment? Does the texture attachment have alpha?
yes

3) Anything out-of-ordinary with the framebuffer?
Nothing special RGBA unsigned byte buffer it is.
We go extra length to make sure the render is finished. (gl finisht etc.)

```

    var  canvasPixels = new Uint8Array(4 * width * height);
    var status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
    if (status !== gl.FRAMEBUFFER_COMPLETE) {
        return console.error('FRAMEBUFFER status invalid.', status);
    }
    gl.flush();
    gl.finish();
    gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, canvasPixels);
```

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