Xgl [1] was released in the same year and had quite similar capabilities [2]. Xgl, in turn, lead to Compiz/Beryl which is the technical ancestor of the most popular window managers we run on Linux desktops nowadays (e.g., Kwin in KDE).
So to some extent, we still use the tech which was developed back then, the effects are just a lot more subtle.
There's acryllic everywhere too, which is blurry transparency, but you might not notice it either.
That said: I miss Compiz wobbly windows. They were cool.
Last I checked, Kwin still had that functionnality.
That said, I just found https://www.stardock.com/products/windowfx/
Because I get the impression this (not-C, not-Rust, not-stereotypically-fast) code is what's running at 60(?)fps, doing the actual deformation animation.
Nice.
Alas, the improvement that should really be made is to encode both n and n+1 in the same update and interpolate in the vertex shader, not hard here but I was lazy..
The difference is that both Looking Glass and Xgl works as an proxy X server. While AIGLX was an effort to make client-side libgl implementations usable from the X server itself, which is good for Acceleration of GLX in Indirect mode (hence AIGLX) but also as a general HW acceleration backend for things like XRender and XVideo (for example intel driver emulates XVideo in terms of OpenGL) and with addition of one simple OpenGL extension (ability to create GL texture from contents of X11 window/pixmap) allows all the 3D window manager tricks.