migrate blocks interaction (scripting) to global chunks storage (WIP)

src/maths/voxmaths.hpp

@@ -1,7 +1,5 @@
 #pragma once
 
-#include "typedefs.hpp"
-
 inline constexpr int floordiv(int a, int b) {
     if (a < 0 && a % b) {
         return (a / b) - 1;
@@ -9,6 +7,23 @@ inline constexpr int floordiv(int a, int b) {
     return a / b;
 }
 
+inline constexpr bool is_pot(int a) {
+    return (a > 0) && ((a & (a - 1)) == 0);
+}
+
+inline constexpr unsigned floorlog2(unsigned x) {
+    return x == 1 ? 0 : 1 + floorlog2(x >> 1);
+}
+
+template<int b>
+inline constexpr int floordiv(int a) {
+    if constexpr (is_pot(b)) {
+        return a >> floorlog2(b);
+    } else {
+        return floordiv(a, b);
+    }
+}
+
 inline constexpr int ceildiv(int a, int b) {
     if (a > 0 && a % b) {
         return a / b + 1;