# getStateFromMeta, getMetaFromState in BlockSapling algorithm

## Recommended Posts

I was working on implementing my own trees, wood and whatnot and while l was looking at the BlockSapling class I noticed it has two properties, and the algorithms for converting the two properties into one meta data value and back is as follows:

To convert to meta:

```int i = 0;
i = i | ((Integer)state.getValue(STAGE)).intValue() << 3;
return i;
```

To convert back:

```this.getDefaultState().withProperty(TYPE, BlockPlanks.EnumType.byMetadata(meta & 7)).withProperty(STAGE, Integer.valueOf((meta &  >> 3));
```

When I first saw this I was a bit perplexed, but then I did the bit-wise operations on paper with some random meta and state values and it worked. So I understand that it works, but I am still curious about how it works. I imagine this did not just pop out of someones head when they needed one meta value to represent multiple pieces of data, or maybe it did? The values being compared against are seemingly arbitrary?. Is there a name for operations that give the operands from the base operation? Is there an algorithm being followed here, if so what algorithm? I am very curious about the thought process behind this code, any information would be wonderful. Again, I am asking about the logic within these functions, not the functions themselves.

##### Share on other sites

http://minecraft.gamepedia.com/Sapling#Block_state

The 4th bit of the metadata component number is the "stage."  Saplings need to receive two block updates in order to turn into trees, rather than 1.  That bit stores whether or not its already "grown" once (it's similar to crop's AGE state value).

The bitwise operators are just a fast way of composing and decomposing the state into/outof metadata integers.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

DO NOT PM ME WITH PROBLEMS. No help will be given.

##### Share on other sites

I see now, thanks!

##### Share on other sites

Feel free to also have a look over my project on github as I have created a fully working wood set: log, leaves, sapling with tree gen, plank, door, slab and stairs.

Well almost fully the only missing piece of the puzzle is fence and gate.

I understand my methods are different from what most people do. I like to reduce the amount of clutter by using  multipurpose classes and avoid using sub blocks or packing sub blocks into one block like for ex Log or NewLog does this. I use a custom WoodType enum found in my custom plank class and is used by everything wood including doors.

For ex my Sapling block class

https://github.com/trollworkout/technorcery/blob/master/src/main/java/com/technorcery/common/blocks/SaplingBlock.java

I think I could not extend original Sapling class because it had a constructor for VARIANT or TYPE meta in the sapling which contractor cannot be overriden so I had to make my own. is been a few weeks so I don't fully remember now. but it works!

Disclaimer:  I been told to keep my opinions to myself, to shut up and that I am spreading lies and misinformation or even that my methods are unorthodox and or too irregular. Here are my suggestions take it or leave it.

## Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.

×   Pasted as rich text.   Restore formatting

Only 75 emoji are allowed.

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

• ### Posts

• I have been having a problem with minecraft forge. Any version. Everytime I try to launch it it always comes back with error code 1. I have tried launching from curseforge, from the minecraft launcher. I have also tried resetting my computer to see if that would help. It works on my other computer but that one is too old to run it properly. I have tried with and without mods aswell. Fabric works, optifine works, and MultiMC works aswell but i want to use forge. If you can help with this issue please DM on discord my # is Haole_Dawg#6676
• Situs slot gacor hari ini resmi terupdate

• ### Who's Online (See full list)

×

• #### Activity

×
• Create New...