mirror of
https://github.com/patriciogonzalezvivo/thebookofshaders
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27 lines
539 B
GLSL
27 lines
539 B
GLSL
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// Author @patriciogv - 2015 - patricio.io
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#ifdef GL_ES
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precision mediump float;
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#endif
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const float 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 stripes(vec2 st){
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return step(.2,abs(sin(st.x*PI)));
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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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vec2 pos = vec2(0.5)-st;
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float a = atan(pos.y,pos.x);
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float r = length(pos);
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vec3 color = vec3(stripes(vec2(a,r)*50.));
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gl_FragColor = vec4(color, 1.0);
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}
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