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61 lines
1.7 KiB
GLSL
61 lines
1.7 KiB
GLSL
// Author @patriciogv ( patriciogonzalezvivo.com ) - 2015
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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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#define PI 3.14159265358979323846
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vec2 rotate2D(vec2 _st, float _angle){
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_st -= 0.5;
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_st = mat2(cos(_angle),-sin(_angle),
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sin(_angle),cos(_angle)) * _st;
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_st += 0.5;
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return _st;
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}
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vec2 tile(vec2 _st, float _zoom){
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_st *= _zoom;
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return fract(_st);
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}
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float box(vec2 _st, vec2 _size, float _smoothEdges){
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_size = vec2(0.5)-_size*0.5;
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vec2 aa = vec2(_smoothEdges*0.5);
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vec2 uv = smoothstep(_size,_size+aa,_st);
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uv *= smoothstep(_size,_size+aa,vec2(1.0)-_st);
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return uv.x*uv.y;
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}
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void main(void){
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vec2 st = gl_FragCoord.xy/u_resolution.xy;
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vec3 color = vec3(0.0);
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// Divide the space in 4
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st = tile(st,4.);
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// Use a matrix to rotate the space 45 degrees
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st = rotate2D(st,PI*0.25);
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// Draw a square
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color = vec3(box(st,vec2(0.7),0.01));
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// color = vec3(st,0.0);
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gl_FragColor = vec4(color,1.0);
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}
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