stalking comet
#ifdef GL_ES
precision mediump float;
#endif
uniform float time;uniform vec2 mouse;uniform vec2 resolution;uniform sampler2D
bb;float a(vec2 c){return fract(sin(dot(c.xy,vec2(12.9898,78.233)))*43758.5453)
;}void main(void){float t=0.001*time;float pi=3.1415;vec2 r=resolution;vec2 f=
gl_FragCoord.xy;vec4 b=texture2D(bb,(f/r))*0.84;vec2 p=(f-.5*r)/min(r.x,r.y);
vec3 c=vec3(0);vec2 m=(mouse-.5)*1.2;for(int i=0;i<111;++i){vec2 pos=m+vec2(.1
*cos(t*2.*pi*float(i)/47.),.1*sin(t*2.*pi*float(i)/47.));c+=(0.002/length(p-pos
*a(pos)))*vec3(1);}gl_FragColor=vec4(normalize(vec3(0.7+0.5*m,.7))*c-b.rgb,1);}
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