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/*
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​
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    daily: 007
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    author: Will Stallwood
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    insta: https://www.instagram.com/willstall/
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*/
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​
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#ifdef GL_ES
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    precision mediump float;
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#endif
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​
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#define PI 3.14159265359
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#define HALF_PI 1.57079632675
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#define TWO_PI 6.283185307
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​
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uniform vec2 u_resolution;
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uniform vec2 u_mouse;
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uniform float u_time;
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​
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vec2 center(vec2 st)
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{
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    float aspect = u_resolution.x/u_resolution.y;
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    st.x = st.x * aspect - aspect * 0.5 + 0.5;
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    return st;
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}
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​
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float mmax(float d, float d1, float d2)
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{
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    return min(d,  max(d1,d2));
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}
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​
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void main() {
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    vec2 st = gl_FragCoord.xy / u_resolution.xy;
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    st = center( st );
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​
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    vec3 color = vec3(0.1);
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​
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    float d0 = length(st - vec2(0.5));
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    float d1 = length(st);
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    float d2 = length(st - vec2(1.0));
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    float d3 = length(st - vec2(1.0,0.0));
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    float d4 = length(st - vec2(0.0,1.0));
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​
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    float t = u_time * 5.0;
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    float d = 1.0;
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        d = mmax(d,d0,d1);
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        d = mmax(d,d0,d2);
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        d = mmax(d,d0,d3);
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        d = mmax(d,d0,d4);
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​
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    float g = smoothstep(0.3,0.4,sin(d*100.0+t));
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        g += smoothstep(-3.,1.0,sin(d*100.0+t))*.2*sin(t*1.0);
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        g *= smoothstep( .1, .2,sin(d*10.0+t*1.5));//-.1;
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        g -= smoothstep(-.1,.2,sin(d*10.0+t*1.5))*.2*sin(t*1.0);
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    color += g;
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​
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    // vignette
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    color *= 1.0-(length(st-0.5)-.3);
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​
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    gl_FragColor = vec4(color, 1.0);
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}