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57 lines
1.7 KiB
GLSL
57 lines
1.7 KiB
GLSL
// Author @patriciogv - 2015
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// Title: Matrix
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#ifdef GL_ES
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precision mediump float;
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#endif
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// Copyright (c) Patricio Gonzalez Vivo, 2015 - http://patriciogonzalezvivo.com/
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// I am the sole copyright owner of this Work.
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//
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// You cannot host, display, distribute or share this Work in any form,
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// including physical and digital. You cannot use this Work in any
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// commercial or non-commercial product, website or project. You cannot
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// sell this Work and you cannot mint an NFTs of it.
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// I share this Work for educational purposes, and you can link to it,
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// through an URL, proper attribution and unmodified screenshot, as part
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// of your educational material. If these conditions are too restrictive
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// please contact me and we'll definitely work it out.
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uniform vec2 u_resolution;
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uniform float u_time;
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float random(in float x){ return fract(sin(x)*43758.5453); }
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float random(in vec2 st){ return fract(sin(dot(st.xy ,vec2(12.9898,78.233))) * 43758.5453); }
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float randomChar(vec2 outer,vec2 inner){
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float grid = 5.;
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vec2 margin = vec2(.2,.05);
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vec2 borders = step(margin,inner)*step(margin,1.-inner);
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vec2 ipos = floor(inner*grid);
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vec2 fpos = fract(inner*grid);
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return step(.5,random(outer*64.+ipos)) * borders.x * borders.y * step(0.01,fpos.x) * step(0.01,fpos.y);
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}
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void main(){
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vec2 st = gl_FragCoord.st/u_resolution.xy;
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st.y *= u_resolution.y/u_resolution.x;
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vec3 color = vec3(0.0);
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float rows = 1.0;
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// rows = 3.0;
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// rows = 12.0;
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// rows = 24.0;
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vec2 ipos = floor(st*rows);
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vec2 fpos = fract(st*rows);
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ipos += vec2(0.,floor(u_time*20.*random(ipos.x+1.)));
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float pct = 1.0;
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pct *= randomChar(ipos,fpos);
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// pct *= random(ipos);
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color = vec3(pct);
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gl_FragColor = vec4( color , 1.0);
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}
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