Java Community | Help. Code. Learn.•13h ago

Unpacking packed int

I came up with these methods to pack and unpack ints:

public static int packInts(int first4, int last4) {
        return (first4 << 16) | last4;
}
public static Vector2i unpackInt(int all8) {
    return new Vector2i(all8 << 16, all8 >> 16);
}

public static int packInts(int first4, int last4) {
        return (first4 << 16) | last4;
}
public static Vector2i unpackInt(int all8) {
    return new Vector2i(all8 << 16, all8 >> 16);
}

However when I unpack the packed int I get an unepxected result. For example if I pack (3, 2) then unpack it I get (131072, 3)

8 Replies

JavaBot•12h ago

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dan1st•12h ago

that's because the unpack method doesn't... unpack that if you want to revert the << 16, you'd need >> 16

𝓐pothiconOP•12h ago

i do have a >> 16

dan1st•12h ago

and to revert the |/get the second part back, you'd need & 0xFFFF

𝓐pothiconOP•12h ago

wait i got it

𝓐pothiconOP•12h ago

thanks

JavaBot•12h ago

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JavaBot•12h ago

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Unpacking packed int