mirror of
https://github.com/patriciogonzalezvivo/thebookofshaders
synced 2024-11-03 23:15:23 +00:00
33 lines
720 B
GLSL
33 lines
720 B
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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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 box(in vec2 st, in vec2 size){
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size = vec2(0.5) - size*0.5;
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vec2 uv = smoothstep(size,
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size+vec2(0.001),
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st);
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uv *= smoothstep(size,
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size+vec2(0.001),
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vec2(1.0)-st);
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return uv.x*uv.y;
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}
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float cross(in vec2 st, float size){
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return box(st, vec2(size,size/4.)) +
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box(st, vec2(size/4.,size));
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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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gl_FragColor = vec4( vec3( cross(st,0.4) ) ,1.0);
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}
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