tweak

fields.js

@@ -0,0 +1,28 @@
+import { SIZE } from "./grid.js";
+
+export function createMapFields() {
+  const flowTo = new Int32Array(SIZE);
+  flowTo.fill(-1);
+
+  return {
+    elevation: new Float32Array(SIZE),
+    moisture: new Float32Array(SIZE),
+    slope: new Float32Array(SIZE),
+    sea: new Uint8Array(SIZE),
+    river: new Float32Array(SIZE),
+    floodplain: new Float32Array(SIZE),
+    plain: new Float32Array(SIZE),
+    agriculture: new Float32Array(SIZE),
+    ridgeField: new Float32Array(SIZE),
+    valleyField: new Float32Array(SIZE),
+    basinField: new Float32Array(SIZE),
+    coastalLowland: new Float32Array(SIZE),
+    flowAccum: new Float32Array(SIZE),
+    erosionField: new Float32Array(SIZE),
+    depositionField: new Float32Array(SIZE),
+    flowTo,
+    portSuitability: new Float32Array(SIZE),
+    crossingSuitability: new Float32Array(SIZE),
+    passSuitability: new Float32Array(SIZE),
+  };
+}