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More nibble array re-ordering optimisation

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Dylan K. Taylor 2016-11-29 12:36:19 +00:00
parent dd01407dd4
commit 5025b4aba1
1 changed files with 10 additions and 15 deletions
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25
src/pocketmine/level/format/generic/GenericChunk.php
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@ -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));
}
}
}