tutorial: add some cosmetic white noise.

tutorial/03_noise.lolfx

@@ -88,7 +88,10 @@ float noise3d(vec3 p)
 void main(void)
 {
     vec2 tmp = pass_Rotation * pass_Position;
-    float test = tmp.x * tmp.y + 0.75 * sin(3.0 * u_Time);
+    float test = tmp.x * tmp.y + sin(3.0 * u_Time);
+
+    /* Add some garbage noise */
+    test += fract(sin(test * 938.437) * 137.0) / 2.0;
 
     vec3 points[4] = (test > 0.0) ? fire : water;