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77 lines
1.7 KiB
GLSL
77 lines
1.7 KiB
GLSL
// Author @patriciogv - 2015
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// http://patriciogonzalezvivo.com
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#ifdef GL_ES
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precision mediump float;
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#endif
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#define PI 3.1415926535897932384626433832795
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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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float random (in vec2 _st) {
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return fract(sin(dot(_st.xy,
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vec2(12.9898,78.233)))*
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43758.5453123);
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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 circle(vec2 _st, float _radius){
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vec2 pos = vec2(0.5)-_st;
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_radius *= 0.75;
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return 1.-smoothstep(_radius-(_radius*0.01),_radius+(_radius*0.01),dot(pos,pos)*3.14);
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}
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float box(vec2 _st, vec2 _size){
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_size = vec2(0.5)-_size*0.5;
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vec2 uv = smoothstep(_size-vec2(0.0001),_size,_st);
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uv *= smoothstep(_size-vec2(0.0001),_size,vec2(1.0)-_st);
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return uv.x*uv.y;
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}
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vec3 pattern(inout vec2 st){
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st *= 5.0;
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st.x += u_time*0.5;
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vec3 normal = vec3(0.0);
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vec2 ivec = floor(st); // integer
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vec2 fvec = fract(st); // fraction
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vec2 pos = fvec;
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float index = random(ivec);
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if(index > 0.5){
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normal.x = step(0.5,pos.y)*2.-1.;
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normal *= (1.0-vec3(box(fvec,vec2(1.0,0.95))));
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} else {
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normal.y = step(0.5,pos.x)*2.-1.;
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normal *= (1.0-vec3(box(fvec,vec2(0.95,1.))));
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}
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st = fvec;
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return normal;
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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.x *= u_resolution.x/u_resolution.y;
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vec3 normal = pattern(st);
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st = tile(st,2.);
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vec2 pos = st-0.5;
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float a = atan(pos.y,pos.x);
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normal += vec3(cos(a),sin(a),0.)*circle(st,0.4);
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normal *= 1.0-circle(st,0.26);
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normal.b = 1.0;
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gl_FragColor = vec4(normal*0.5+0.5,1.0);
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} |