Parallel agents movement.

src/grid.rs

@@ -14,14 +14,10 @@ pub struct Grid {
     blur: Blur,
 }
 
-#[inline(always)]
-fn is_power_of_two(x: usize) -> bool {
-    (x & (x - 1)) == 0
-}
-
 impl Grid {
     /// Create a new grid filled with random floats in the [0.0..1.0) range.
     pub fn new(width: usize, height: usize) -> Self {
+        use crate::util::is_power_of_two;
         if !is_power_of_two(width) || !is_power_of_two(height) {
             panic!("Grid dimensitions must be a power of two.");
         }