Some demo on Amiga shows colored tube,
quickly i have made my first shader ... <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">
All deformation are made with shader you must know here 0 "zero" events on C2.
So after finishing 
newt request shader i will developpe some old school fx used on various machines
like My best preferred Amiga, Atari C64 Etc... So, these machines will never be forgotten thanks to people like me <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">
Quick example with 0 events!
http://gigatron3k.free.fr/html5/C2/FX/tubefx
btw: Virgill on Air: Physical Presence from Jogeir Liljedahl date: 1994 from: Love of Virtual Dreams / Fairlight (demo ...)
My shader lab is shadertoy : https://www.shadertoy.com/view/XdcXRj
you can play this shader...