mirrors/PocketMine-MP
1
0
Fork 0
mirror of https://github.com/pmmp/PocketMine-MP.git synced 2025-07-25 12:23:48 +00:00
Code Issues Projects Releases Wiki Activity

More nibble array re-ordering optimisation

Browse Source
This commit is contained in:
Dylan K. Taylor 2016-11-29 12:36:19 +00:00
parent dd01407dd4
commit 5025b4aba1
1 changed files with 10 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
src/pocketmine/level/format/generic/GenericChunk.php
View File

@ -714,24 +714,19 @@ class GenericChunk implements Chunk{
public static final function reorderNibbleArray(string $array) : string{
$result = str_repeat("\x00", 2048);
$i = 0;
for($x = 0; $x < 16; ++$x){
for($x = 0; $x < 8; ++$x){
for($z = 0; $z < 16; ++$z){
$zx = (($z << 3) | ($x >> 1));
$zx = (($z << 3) | $x);
for($y = 0; $y < 8; ++$y){
$j = (($y << 8) | $zx);
$byte = ord($array{$j});
if(($x & 1) === 0){
$current = ($byte & 0x0f);
$byte = ord($array{$j | 0x80});
$current |= ($byte << 4);
}else{
$current = ($byte >> 4);
$byte = ord($array{$j | 0x80});
$current |= ($byte & 0xf0);
}
$result{$i++} = chr($current);
$result{$i++} = chr((ord($array{$j}) & 0x0f) | (ord($array{$j | 0x80}) << 4));
}
}
for($z = 0; $z < 16; ++$z){
$zx = (($z << 3) | $x);
for($y = 0; $y < 8; ++$y){
$j = (($y << 8) | $zx);
$result{$i++} = chr((ord($array{$j}) >> 4) | (ord($array{$j | 0x80}) & 0xf0));
}
}
}