/vr/ - Retro Games

>>6260413
>add positive(back layer) and negative(foreground layer) height offset depending on horizontal distance to the middle

also some outline (darken upper pixels of the foreground layer) and lighten surface a bit (pixels of the background layer that are above corresponding ones of the foreground)

I think the bubbles can be done as some static circles
The "pop" at the top may be expressed as several pixels rising up to make a splash, or just take a lava splash from Heretic/hexen and recolor it (or try to recreate with TEXTURE lump magic as you do everything else, you magnificent bastard)