Improve gameplay

shared/src/helper/hsl.ts

@@ -0,0 +1,34 @@
+import { vec3 } from 'gl-matrix';
+import { rgb } from './rgb';
+
+export const hsl = (hue: number, saturation: number, lightness: number): vec3 => {
+  hue /= 360;
+  saturation /= 100;
+  lightness /= 100;
+  let r, g, b;
+
+  if (saturation == 0) {
+    r = g = b = lightness;
+  } else {
+    const hue2rgb = (p: number, q: number, t: number) => {
+      if (t < 0) t += 1;
+      if (t > 1) t -= 1;
+      if (t < 1 / 6) return p + (q - p) * 6 * t;
+      if (t < 1 / 2) return q;
+      if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
+      return p;
+    };
+
+    const q =
+      lightness < 0.5
+        ? lightness * (1 + saturation)
+        : lightness + saturation - lightness * saturation;
+    const p = 2 * lightness - q;
+
+    r = hue2rgb(p, q, hue + 1 / 3);
+    g = hue2rgb(p, q, hue);
+    b = hue2rgb(p, q, hue - 1 / 3);
+  }
+
+  return rgb(r, g, b);
+};