Add voronoi.glsl

voronoi.glsl

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+//Modified from: https://www.shadertoy.com/view/MslGD8
+
+// Created by inigo quilez - iq/2013
+// License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
+
+#ifdef GL_ES
+precision mediump float;
+#extension GL_OES_standard_derivatives : enable
+#endif
+
+uniform float time;
+uniform vec2 mouse;
+uniform vec2 resolution;
+
+vec2 hash( vec2 p ) { p=vec2(dot(p,vec2(127.1,311.7)),dot(p,vec2(269.5,183.3))); return fract(sin(p)*18.5453); }
+
+// return distance, and cell id
+vec2 voronoi( in vec2 x )
+{
+    vec2 n = floor( x );
+    vec2 f = fract( x );
+
+	vec3 m = vec3( 8.0 );
+    for( int j=-1; j<=1; j++ )
+    for( int i=-1; i<=1; i++ )
+    {
+        vec2  g = vec2( float(i), float(j) );
+        vec2  o = hash( n + g );
+        vec2  r = g - f + (0.5+0.5*tan(time+6.2831-o));
+	float d = dot( r, r );
+        if( d<m.x )
+            m = vec3( d, o );
+    }
+
+    return vec2( sqrt(m.x), m.y+m.z );
+}
+
+void main()
+{
+    vec2 p = gl_FragCoord.xy/max(resolution.x,resolution.y);
+    
+    // computer voronoi patterm
+    vec2 c = voronoi( (14.0+6.0*sin(0.2*time))*p );
+
+    // colorize
+    vec3 col = 0.5 + 0.5*cos( c.y*6.2831 + vec3(0.0,1.0,2.0) );	
+	
+    gl_FragColor = vec4( col, 1.0 );
+}