Java Community | Help. Code. Learn.•3mo 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•3mo ago

⌛ This post has been reserved for your question.

Hey @𝓐pothicon! Please use /close or the Close Post button above when your problem is solved. Please remember to follow the help guidelines. This post will be automatically marked as dormant after 300 minutes of inactivity.

TIP: Narrow down your issue to simple and precise questions to maximize the chance that others will reply in here.

dan1st•3mo ago

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

𝓐pothiconOP•3mo ago

i do have a >> 16

dan1st•3mo ago

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

𝓐pothiconOP•3mo ago

wait i got it

𝓐pothiconOP•3mo ago

thanks

JavaBot•3mo ago

If you are finished with your post, please close it. If you are not, please ignore this message. Note that you will not be able to send further messages here after this post have been closed but you will be able to create new posts.

JavaBot•3mo ago

Post Closed

This post has been closed by <@465515365108154380>.

Gaming

Programming

Unpacking packed int

Did you find this page helpful?