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SubChunk: reduce memory usage on fast-deserialized chunks

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this saves about 25MB RAM on an idle server on HEAD commit with 856 chunks loaded.
This commit is contained in:
Dylan K. Taylor 2019-06-10 15:52:07 +01:00
parent 261ba017a6
commit 419fc418fe
1 changed files with 12 additions and 8 deletions
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20
src/pocketmine/world/format/SubChunk.php
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@ -32,11 +32,13 @@ use function defined;
use function ord;
use function str_repeat;
use function strlen;
use function substr_count;
if(!defined(__NAMESPACE__ . '\ZERO_NIBBLE_ARRAY')){
define(__NAMESPACE__ . '\ZERO_NIBBLE_ARRAY', str_repeat("\x00", 2048));
}
if(!defined(__NAMESPACE__ . '\FIFTEEN_NIBBLE_ARRAY')){
define(__NAMESPACE__ . '\FIFTEEN_NIBBLE_ARRAY', str_repeat("\xff", 2048));
}
class SubChunk implements SubChunkInterface{
/** @var PalettedBlockArray[] */
@ -47,10 +49,12 @@ class SubChunk implements SubChunkInterface{
/** @var string */
protected $skyLight;
private static function assignData(&$target, string $data, int $length, string $value = "\x00") : void{
if(strlen($data) !== $length){
assert($data === "", "Invalid non-zero length given, expected $length, got " . strlen($data));
$target = str_repeat($value, $length);
private static function assignData(&$target, string $data, string $default) : void{
if($data === "" or $data === $default){
$target = $default;
}elseif(strlen($data) !== 2048){
assert(false, "Invalid length given, expected 2048, got " . strlen($data));
$target = $default;
}else{
$target = $data;
}
@ -66,8 +70,8 @@ class SubChunk implements SubChunkInterface{
public function __construct(array $blocks, string $skyLight = "", string $blockLight = ""){
$this->blockLayers = $blocks;
self::assignData($this->skyLight, $skyLight, 2048, "\xff");
self::assignData($this->blockLight, $blockLight, 2048);
self::assignData($this->skyLight, $skyLight, FIFTEEN_NIBBLE_ARRAY);
self::assignData($this->blockLight, $blockLight, ZERO_NIBBLE_ARRAY);
}
public function isEmpty(bool $checkLight = true) : bool{
@ -81,7 +85,7 @@ class SubChunk implements SubChunkInterface{
}
return
(!$checkLight or (
substr_count($this->skyLight, "\xff") === 2048 and
$this->skyLight === FIFTEEN_NIBBLE_ARRAY and
$this->blockLight === ZERO_NIBBLE_ARRAY
)
);