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This commit is contained in:
NuclearW 2012-07-06 17:58:43 -04:00
parent 7d372af51e
commit 21d2229572
1 changed files with 25 additions and 0 deletions
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src/main/java/com/gmail/nossr50/util/blockmeta/PrimitiveChunkletStore.java
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@ -84,6 +84,31 @@ public class PrimitiveChunkletStore implements ChunkletStore {
}
}
/*
* The column: An array of 9 bytes which represent all y values for a given (x,z) Chunklet-coordinate
*
* The first byte is an address byte, this provides the x and z values.
* The next 8 bytes are all y values from 0 to 63, with each byte containing 8 bits of true/false data
*
* Each of these 8 bytes address to a y value from right to left
*
* Examples:
* 00000001 represents that the lowest y value in this byte is true, all others are off
* 10000000 represents that the highest y value in this byte is true, all others are off
* 10000001 represents that the lowest and highest y values in this byte are true, all others are off
*
* Full columns:
* See comment on Address byte for information on how to use that byte
*
* Example:
* ADDRESS_BYTE 10000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000
* - x, z from ADDRESS_BYTE
* - The next byte contains data from 0 to 7
* - 1 is set in the highest bit position, this is 7 in y coordinate
* - The next byte contains data from 8 to 15
* - 1 is set in the lowest bit position, this is 8 in the y coordinate
* Therefore, for this column: There are true values at (x, 7, z) and (x, 8, z)
*/
private byte[] constructColumn(int x, int z) {
byte[] column = new byte[9];
int index = 1;