Fix packed asset never power of two

Since setting power of two is never used anywhere, add logic check and process power of two for texture size.

packages/assetpack/src/texture-packer/packer/fitTextureToPacker.ts

@@ -1,6 +1,6 @@
 import type { PackTexturesOptions, PixiPacker } from './packTextures.js';
 
-export function fitTextureToPacker(bin: PixiPacker, { width, height, fixedSize, padding }: PackTexturesOptions)
+export function fitTextureToPacker(bin: PixiPacker, { width, height, fixedSize, padding, powerOfTwo }: PackTexturesOptions)
 {
     if (!fixedSize)
     {
@@ -27,6 +27,21 @@ export function fitTextureToPacker(bin: PixiPacker, { width, height, fixedSize,
         height += padding ?? 0;
         width += padding ?? 0;
     }
-
+
+    if (powerOfTwo) 
+    {
+        height = nearestPowerOf2(height);
+        width = nearestPowerOf2(width);
+    }
+
     return { width, height } as { width: number, height: number};
 }
+
+function nearestPowerOf2(x) {
+    if (x <= 1) return 1;
+    let power = 1;
+    while (power < x) {
+        power <<= 1;
+    }
+    return power;
+}