Move to Renderer V2

packages/utils/src/NumberBank.ts

@@ -0,0 +1,54 @@
+export class NumberBank
+{
+    private _reservedNumbers: number[];
+    private _freeNumbers: number[];
+
+    constructor(k: number)
+    {
+        if(k < 0) k = 0;
+
+        this._reservedNumbers = [];
+        this._freeNumbers = [];
+
+        let i = 0;
+
+        while(i < k)
+        {
+            this._freeNumbers.push(i);
+
+            i++;
+        }
+    }
+
+    public dispose(): void
+    {
+        this._reservedNumbers = null;
+        this._freeNumbers = null;
+    }
+
+    public reserveNumber(): number
+    {
+        if(this._freeNumbers.length > 0)
+        {
+            const k = this._freeNumbers.pop();
+
+            this._reservedNumbers.push(k);
+
+            return k;
+        }
+
+        return -1;
+    }
+
+    public freeNumber(k: number): void
+    {
+        const i = this._reservedNumbers.indexOf(k);
+
+        if(i >= 0)
+        {
+            this._reservedNumbers.splice(i, 1);
+
+            this._freeNumbers.push(k);
+        }
+    }
+}