port and adaptation of Vorticity confinement by davidar https://www.shadertoy.com/view/MlSfRR

right click to reset left click to blur

finally understood how to convert texcoord to fragcoord that a lot of shadertoy patches use - essential in some buffer feedback/manipulation patches

huge thanks to pandur for needed feedback and explanation

texcoord is simply multiplied by resolution inside the main function to get fragcoordinates

threw the resulting shader onto a sphere and some checked out specular matcap - nothing special

tested on desktop, probably melts