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Add toggle for RNG manipulation

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Paper patches RNG maniplulation by using a shared (and locked) random source.
This comes with a performance gain, but technical players may prefer the ability to manipulate RNG.
This commit is contained in:
Encode42
2025-01-12 15:57:06 -08:00
committed by granny
parent 69b42fb1b5
commit db412df466
4 changed files with 32 additions and 54 deletions
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27
purpur-server/minecraft-patches/sources/net/minecraft/world/entity/Entity.java.patch
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@@ -9,15 +9,28 @@
// CraftBukkit start
private static final int CURRENT_LEVEL = 2;
public boolean preserveMotion = true; // Paper - Fix Entity Teleportation and cancel velocity if teleported; keep initial motion on first setPositionRotation
@@ -253,6 +_,7 @@
@@ -253,9 +_,10 @@
public double xOld;
public double yOld;
public double zOld;
+ public float maxUpStep; // Purpur - Add option to set armorstand step height
public boolean noPhysics;
private boolean wasOnFire;
public final RandomSource random = SHARED_RANDOM; // Paper - Share random for entities to make them more random
@@ -526,6 +_,12 @@
- public final RandomSource random = SHARED_RANDOM; // Paper - Share random for entities to make them more random
+ public final RandomSource random; // Paper - Share random for entities to make them more random // Add toggle for RNG manipulation
public int tickCount;
private int remainingFireTicks = -this.getFireImmuneTicks();
public boolean wasTouchingWater;
@@ -289,7 +_,7 @@
public PortalProcessor portalProcess;
public int portalCooldown;
private boolean invulnerable;
- protected UUID uuid = Mth.createInsecureUUID(this.random);
+ protected UUID uuid; // Purpur - Add toggle for RNG manipulation
protected String stringUUID = this.uuid.toString();
private boolean hasGlowingTag;
private final Set<String> tags = new io.papermc.paper.util.SizeLimitedSet<>(new it.unimi.dsi.fastutil.objects.ObjectOpenHashSet<>(), MAX_ENTITY_TAG_COUNT); // Paper - fully limit tag size - replace set impl
@@ -526,10 +_,20 @@
}
// Paper end - optimise entity tracker
@@ -30,6 +43,14 @@
public Entity(EntityType<?> entityType, Level level) {
this.type = entityType;
this.level = level;
this.dimensions = entityType.getDimensions();
+ // Purpur start - Add toggle for RNG manipulation
+ this.random = level == null || level.purpurConfig.entitySharedRandom ? SHARED_RANDOM : RandomSource.create();
+ this.uuid = Mth.createInsecureUUID(this.random);
+ // Purpur end - Add toggle for RNG manipulation
this.position = Vec3.ZERO;
this.blockPosition = BlockPos.ZERO;
this.chunkPosition = ChunkPos.ZERO;
@@ -1899,7 +_,7 @@
return this.isInWater() || flag;
}

7
purpur-server/minecraft-patches/sources/net/minecraft/world/entity/animal/Squid.java.patch
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@@ -1,6 +1,11 @@
--- a/net/minecraft/world/entity/animal/Squid.java
+++ b/net/minecraft/world/entity/animal/Squid.java
@@ -50,6 +_,25 @@
@@ -46,10 +_,29 @@
public Squid(EntityType<? extends Squid> entityType, Level level) {
super(entityType, level);
- //this.random.setSeed(this.getId()); // Paper - Share random for entities to make them more random
+ if (!level.purpurConfig.entitySharedRandom) this.random.setSeed(this.getId()); // Paper - Share random for entities to make them more random // Purpur - Add toggle for RNG manipulation
this.tentacleSpeed = 1.0F / (this.random.nextFloat() + 1.0F) * 0.2F;
}

2
purpur-server/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
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@@ -210,9 +210,11 @@ public class PurpurWorldConfig {
public int entityLifeSpan = 0;
public float entityLeftHandedChance = 0.05f;
public boolean entitySharedRandom = true;
private void entitySettings() {
entityLifeSpan = getInt("gameplay-mechanics.entity-lifespan", entityLifeSpan);
entityLeftHandedChance = (float) getDouble("gameplay-mechanics.entity-left-handed-chance", entityLeftHandedChance);
entitySharedRandom = getBoolean("settings.entity.shared-random", entitySharedRandom);
}
public boolean infinityWorksWithoutArrows = false;