void OnPostRender()
{
    if (_uiRenderer != null)
    {
        StartCoroutine(EndOfFrameRender());
    }
}

IEnumerator EndOfFrameRender()
{
    yield return new WaitForEndOfFrame();
    _uiRenderer.PostRender();
}

private void UpdateSettings(Noesis.AntialiasingMode aaMode,
    Noesis.TessellationMode tessMode, Noesis.TessellationQuality tessQuality,
    Noesis.RendererFlags flags)
{
    // update renderer size
    if (_texture == null)
    {
        // ...

        if (_isGraphicsDeviceDirectX)
        {
            // ...

            if (camera != null &&
                camera.actualRenderingPath == UnityEngine.RenderingPath.DeferredLighting)
            {
                // vvv   H E R E   vvv
                //flags |= RendererFlags.FlipY;
            }
        }
    }
    else // Render to Texture
    {
        // ...
    }

    // ...
}