uniform float time;
uniform float seed;
uniform vec2 resolution;
#pragma glslify:noise=require('../../includes/noise/simplex-3d')
#pragma glslify:palette=require('../../includes/palettes/iq-4')
const int iterations=20;
void main(){
vec2 uv=gl_FragCoord.xy/resolution.xy;
vec2 uv0=uv;
uv-=vec2(.5);
uv*=min(vec2(resolution.x/resolution.y,1.),vec2(1.,resolution.y/resolution.x));
float a=40.;
mat2 rot=mat2(cos(a),sin(a),-sin(a),cos(a));
float ot=1.;
float l=length(uv);
vec2 r=vec2(0.);
float st=120.+time*.1;
for(int i=0;i<iterations;++i){
uv=abs(uv*rot)*1.3-1.;
r=uv+vec2(sin(st),cos(st))*.5;
ot=min(ot,abs(dot(r,r)-l*.015-.5));
}
float c=pow(ot,.1)+l*3.;
vec3 col=palette(max(c,.75))*(2.-c);
gl_FragColor=vec4(col,1.);
}
