ikeda++

10/ikdea-02.frag

@@ -0,0 +1,38 @@
+// Author @patriciogv - 2015
+// http://patriciogonzalezvivo.com
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform vec2 u_resolution;
+uniform vec2 u_mouse;
+uniform float u_time;
+
+float random (in vec2 _st) { 
+    return fract(sin(dot(_st.xy,
+                         vec2(12.9898,78.233)))* 
+        43758.5453123);
+}
+
+void main() {
+    vec2 st = gl_FragCoord.xy/u_resolution.xy;
+    st *= vec2(10.0,100.);
+
+    vec2 ivec = floor(st);  // integer
+    vec2 fvec = fract(st);  // fraction
+    
+    vec2 vel = floor(vec2(u_time*10.)); // time
+    vel *= vec2(-1.,0.); // direction
+    vel *= (step(1., mod(ivec.y,2.0))-0.5)*2.; 
+    
+    ivec += vel;
+
+    // Assign a random value base on the integer coord
+    vec3 color = vec3( step(.8,random( ivec ))); 
+
+    // Un comment to see the subdivided grid
+//     color = vec3(fvec,0.0);
+
+    gl_FragColor = vec4(color,1.0);
+}