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https://github.com/patriciogonzalezvivo/thebookofshaders
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28 lines
629 B
GLSL
28 lines
629 B
GLSL
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// By Hang Do Thi Duc ( http://22-8miles.com )
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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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uniform vec2 u_resolution;
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uniform vec2 u_mouse;
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uniform float u_time;
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void main(){
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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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vec2 pos = vec2(0.5)-st;
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float r = length(pos)*2.0;
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float a = atan(pos.y,pos.x);
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float f = abs(cos(a*12. + sin(u_time * 0.2))*sin(a*3. + cos(u_time * 0.3)))*.8+.1;
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float b = 1.-smoothstep( f, f+0.2, sin(r * 2.));
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color = vec3( b );
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gl_FragColor = vec4(color, 1.0);
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}
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