invsqrt()

minetest-api.d.ts

@@ -1749,6 +1749,7 @@ declare global {
     // And this (required to D/Java style float to int truncation)
     function truncate(floating: number): number;
     function fma(x: number, y: number, z: number): number;
+    function invsqrt(r: number): number;
   }
 
   namespace string {

source/utility/math.ts

@@ -60,4 +60,8 @@ namespace utility {
     return (x * y) + z;
   };
 
+  math.invsqrt = function (r: number): number {
+    return 1.0 / sqrt(r);
+  };
+
 }