This is a code golf with the help of Dr. Neyret and coyote.
Demo
Code
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// forked from my: https://www.shadertoy.com/view/lsSfWV // taken Dr. Neyret and coyote's advices void mainImage( out vec4 O, vec2 u ) { vec2 R = iResolution.xy, M = iMouse.xy / R, S = ( M.y < 1e-3 ? 6. : mix(3., 5.5, M.x/M.y) ) / R; O = vec4( length( M= mod( u/R, S) - S*.5 ) < dot( texture(iChannel0, u/R - M), vec4( .21, .72, .07, 0) ) * S.x * ( 1. + .3 * sin(iTime) ) ); } |
