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Code Issues Releases Activity

Fast BiomeManager seed obfuscation

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HaHaWTH
2025-06-14 04:09:07 +14:00
parent 2d193b574b
commit 8e2099e975
2 changed files with 65 additions and 0 deletions
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31
leaf-server/minecraft-patches/features/0280-Fast-BiomeManager-seed-obfuscation.patch Normal file
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: HaHaWTH <102713261+HaHaWTH@users.noreply.github.com>
Date: Tue, 9 Nov 2077 00:00:00 +0800
Subject: [PATCH] Fast BiomeManager seed obfuscation
Pretty tiny optimization, but better than nothing
diff --git a/net/minecraft/world/level/biome/BiomeManager.java b/net/minecraft/world/level/biome/BiomeManager.java
index 00122472991ba0c1a0ea77053aad71cdfa92a7bd..2d3cfa8659d882585b9e698ac8edf5c704623b95 100644
--- a/net/minecraft/world/level/biome/BiomeManager.java
+++ b/net/minecraft/world/level/biome/BiomeManager.java
@@ -34,9 +34,18 @@ public class BiomeManager {
// Leaf end - cache getBiome
}
+ // Leaf start - Replace SHA-256 with XXHash
+ private static final net.jpountz.xxhash.XXHash64 XXHASH = net.jpountz.xxhash.XXHashFactory.fastestInstance().hash64();
public static long obfuscateSeed(long seed) {
- return Hashing.sha256().hashLong(seed).asLong();
+ if (org.dreeam.leaf.config.modules.opt.FastBiomeManagerSeedObfuscation.enabled) {
+ java.nio.ByteBuffer buf = java.nio.ByteBuffer.allocate(8);
+ buf.putLong(0, seed);
+ return XXHASH.hash(buf, org.dreeam.leaf.config.modules.opt.FastBiomeManagerSeedObfuscation.seedObfuscationKey);
+ } else {
+ return Hashing.sha256().hashLong(seed).asLong();
+ }
}
+ // Leaf end - Replace SHA-256 with XXHash
public BiomeManager withDifferentSource(BiomeManager.NoiseBiomeSource newSource) {
return new BiomeManager(newSource, this.biomeZoomSeed);

34
leaf-server/src/main/java/org/dreeam/leaf/config/modules/opt/FastBiomeManagerSeedObfuscation.java Normal file
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package org.dreeam.leaf.config.modules.opt;
import org.dreeam.leaf.config.ConfigModules;
import org.dreeam.leaf.config.EnumConfigCategory;
import org.dreeam.leaf.config.annotations.Experimental;
import java.util.concurrent.ThreadLocalRandom;
public class FastBiomeManagerSeedObfuscation extends ConfigModules {
public String getBasePath() {
return EnumConfigCategory.PERF.getBaseKeyName() + ".fast-biome-manager-seed-obfuscation";
}
@Experimental
public static boolean enabled = false;
public static long seedObfuscationKey = ThreadLocalRandom.current().nextLong();
@Override
public void onLoaded() {
enabled = config.getBoolean(getBasePath() + ".enabled", enabled,
config.pickStringRegionBased(
"""
**EXPERMIENTAL FEATURE**
Replace vanilla SHA-256 seed obfuscation in BiomeManager with XXHash.""",
"""
**实验性功能**
将原版 BiomeManager 的 SHA-256 种子混淆换成 XXHash."""));
seedObfuscationKey = config.getLong(getBasePath() + ".seed-obfuscation-key", seedObfuscationKey,
config.pickStringRegionBased(
"Seed obfuscation key for XXHash.",
"XXHash 的混淆种子."));
}
}