mirror of
https://github.com/patriciogonzalezvivo/thebookofshaders
synced 2024-11-09 19:10:24 +00:00
37 lines
824 B
GLSL
37 lines
824 B
GLSL
// By Jaskirat Randhawa ( http://jaskirat.me/ )
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// For Shader Studio Course https://github.com/patriciogonzalezvivo/ss2015
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#ifdef GL_ES
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precision mediump float;
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#endif
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#define TWO_PI 6.28318530718
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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 circle ( float posX, float posY, float rad){
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vec2 st = gl_FragCoord.xy/u_resolution;
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// st -=.5;
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st.x -=posX;
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st.y -=posY;
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float pct = 1. - length(st)*2.;
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rad = 1./rad;
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pct = fract(pct*3.);
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pct = step(.988,pct);
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return pct;
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}
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void main(){
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vec3 color = vec3(0.0);
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float c1 = circle( .5,.5,1.1);
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c1 += circle( sin(u_time)/2.+.5, cos(u_time)/2.+.5,1.1);
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c1 += circle( sin(u_time+5.)/2.+.5, cos(u_time+5.)/2.+.5,1.1);
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color = vec3(c1);
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gl_FragColor = vec4(color,1.0);
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} |