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Paper/Spigot-Server-Patches/0455-Optimise-entity-hard-collision-checking.patch
Prof-Bloodstone 42433c2626
Updated Upstream (Bukkit/CraftBukkit) (#3980) 
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
09f10fd9 SPIGOT-5950: Add PrepareSmithingEvent event

CraftBukkit Changes:
7c03d257 SPIGOT-6011: End Gateways do not work on Non-Main End Worlds
d492e363 SPIGOT-6015: Small Armor Stand doesn't drop items
5db13eea SPIGOT-5950: Add PrepareSmithingEvent event
2020-07-22 19:35:44 -04:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Wed, 15 Apr 2020 18:08:53 -0700
Subject: [PATCH] Optimise entity hard collision checking
Very few entities actually hard collide, so store them in their own
entity slices and provide a special getEntites type call just for them.
This reduces entity collision checking impact (in my testing) by 25%
for crammed entities (shove 130 cows into an 8x6 area in one chunk).
Less crammed entities are likely to show significantly less benefit.
Effectively, this patch optimises crammed entity situations.
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index cb24f27bc443880b18ffc36236f6ec7174c9d493..b65ae2d6919a67498d0646c5522735086fec00c1 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -91,6 +91,54 @@ public class Chunk implements IChunkAccess {
private final int[] inventoryEntityCounts = new int[16];
// Paper end
+ // Paper start - optimise hard collision handling
+ final com.destroystokyo.paper.util.maplist.EntityList[] hardCollidingEntities = new com.destroystokyo.paper.util.maplist.EntityList[16];
+
+ {
+ for (int i = 0, len = this.hardCollidingEntities.length; i < len; ++i) {
+ this.hardCollidingEntities[i] = new com.destroystokyo.paper.util.maplist.EntityList();
+ }
+ }
+
+ public final void getHardCollidingEntities(@Nullable Entity entity, AxisAlignedBB axisalignedbb, List<Entity> into, Predicate<Entity> predicate) {
+ // copied from getEntities
+ int min = MathHelper.floor((axisalignedbb.minY - 2.0D) / 16.0D);
+ int max = MathHelper.floor((axisalignedbb.maxY + 2.0D) / 16.0D);
+
+ min = MathHelper.clamp(min, 0, this.hardCollidingEntities.length - 1);
+ max = MathHelper.clamp(max, 0, this.hardCollidingEntities.length - 1);
+
+ for (int k = min; k <= max; ++k) {
+ com.destroystokyo.paper.util.maplist.EntityList entityList = this.hardCollidingEntities[k];
+ Entity[] entities = entityList.getRawData();
+
+ for (int i = 0, len = entityList.size(); i < len; ++i) {
+ Entity entity1 = entities[i];
+ if (entity1.shouldBeRemoved) continue; // Paper
+
+ if (entity1 != entity && entity1.getBoundingBox().intersects(axisalignedbb) && (predicate == null || predicate.test(entity1))) {
+ into.add(entity1);
+
+ if (!(entity1 instanceof EntityEnderDragon)) {
+ continue;
+ }
+
+ EntityComplexPart[] aentitycomplexpart = ((EntityEnderDragon) entity1).getComplexParts();
+ int l = aentitycomplexpart.length;
+
+ for (int i1 = 0; i1 < l; ++i1) {
+ EntityComplexPart entitycomplexpart = aentitycomplexpart[i1];
+
+ if (entitycomplexpart != entity && entitycomplexpart.getBoundingBox().intersects(axisalignedbb) && (predicate == null || predicate.test(entitycomplexpart))) {
+ into.add(entitycomplexpart);
+ }
+ }
+ }
+ }
+ }
+ }
+ // Paper end - optimise hard collision handling
+
public Chunk(World world, ChunkCoordIntPair chunkcoordintpair, BiomeStorage biomestorage, ChunkConverter chunkconverter, TickList<Block> ticklist, TickList<FluidType> ticklist1, long i, @Nullable ChunkSection[] achunksection, @Nullable Consumer<Chunk> consumer) {
this.sections = new ChunkSection[16];
this.e = Maps.newHashMap();
@@ -546,7 +594,7 @@ public class Chunk implements IChunkAccess {
entity.chunkY = k;
entity.chunkZ = this.loc.z;
this.entities.add(entity); // Paper - per chunk entity list
- this.entitySlices[k].add(entity);
+ this.entitySlices[k].add(entity); if (entity.hardCollides()) this.hardCollidingEntities[k].add(entity); // Paper - optimise hard colliding entities
// Paper start
if (entity instanceof EntityItem) {
itemCounts[k]++;
@@ -583,7 +631,7 @@ public class Chunk implements IChunkAccess {
entity.entitySlice = null;
entity.inChunk = false;
}
- if (!this.entitySlices[i].remove(entity)) {
+ if (entity.hardCollides()) this.hardCollidingEntities[i].remove(entity); if (!this.entitySlices[i].remove(entity)) { // Paper - optimise hard colliding entities
return;
}
if (entity instanceof EntityItem) {
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 152f613159ef88977de867c0deec94bfa4353f7a..a0249d7a60c1381ebd7131d735a73fa2e9250543 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -211,6 +211,40 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
}
// CraftBukkit end
+ // Paper start
+ /**
+ * Overriding this field will cause memory leaks.
+ */
+ private final boolean hardCollides;
+
+ private static final java.util.Map<Class<? extends Entity>, Boolean> cachedOverrides = java.util.Collections.synchronizedMap(new java.util.WeakHashMap<>());
+ {
+ Boolean hardCollides = cachedOverrides.get(this.getClass());
+ if (hardCollides == null) {
+ try {
+ Object getHardCollisionBoxMethod = Entity.class.getMethod("ay");
+ Object getHardCollisionBoxEntityMethod = Entity.class.getMethod("j", Entity.class);
+ if (!this.getClass().getMethod("ay").equals(getHardCollisionBoxMethod)) {
+ hardCollides = Boolean.TRUE;
+ } else if (!this.getClass().getMethod("j", Entity.class).equals(getHardCollisionBoxEntityMethod)) {
+ hardCollides = Boolean.TRUE;
+ } else {
+ hardCollides = Boolean.FALSE;
+ }
+ cachedOverrides.put(this.getClass(), hardCollides);
+ } catch (Throwable thr) {
+ // shouldn't happen, just explode
+ throw new RuntimeException(thr);
+ }
+ }
+ this.hardCollides = hardCollides.booleanValue();
+ }
+
+ public final boolean hardCollides() {
+ return this.hardCollides;
+ }
+ // Paper end
+
public Entity(EntityTypes<?> entitytypes, World world) {
this.id = Entity.entityCount.incrementAndGet();
this.passengers = Lists.newArrayList();
diff --git a/src/main/java/net/minecraft/server/EntityEnderDragon.java b/src/main/java/net/minecraft/server/EntityEnderDragon.java
index 96f898acdeae1917a4aaf99ec4a48bccf3904488..73e9859e675902d9fc5942547966b52426a496a2 100644
--- a/src/main/java/net/minecraft/server/EntityEnderDragon.java
+++ b/src/main/java/net/minecraft/server/EntityEnderDragon.java
@@ -844,6 +844,7 @@ public class EntityEnderDragon extends EntityInsentient implements IMonster {
@Override
public void checkDespawn() {}
+ public final EntityComplexPart[] getComplexParts() { return this.eK(); } // Paper - OBFHELPER
public EntityComplexPart[] eK() {
return this.children;
}
diff --git a/src/main/java/net/minecraft/server/IEntityAccess.java b/src/main/java/net/minecraft/server/IEntityAccess.java
index 74d4c28246e7db850e6d993e07a84b2a6ca24ce2..267a6baae89c181eed545e6758fac7115eb3882f 100644
--- a/src/main/java/net/minecraft/server/IEntityAccess.java
+++ b/src/main/java/net/minecraft/server/IEntityAccess.java
@@ -53,24 +53,36 @@ public interface IEntityAccess {
return this.b(oclass, axisalignedbb, IEntitySelector.g);
}
+ // Paper start - optimise hard collision
+ /**
+ * Not guaranteed to only return hard colliding entites
+ */
+ default List<Entity> getHardCollidingEntities(@Nullable Entity entity, AxisAlignedBB axisalignedbb, Predicate<Entity> predicate) {
+ return this.getEntities(entity, axisalignedbb, predicate);
+ }
+ // Paper end - optimise hard collision
+
default Stream<VoxelShape> c(@Nullable Entity entity, AxisAlignedBB axisalignedbb, Predicate<Entity> predicate) {
if (axisalignedbb.a() < 1.0E-7D) {
return Stream.empty();
} else {
AxisAlignedBB axisalignedbb1 = axisalignedbb.g(1.0E-7D);
- return this.getEntities(entity, axisalignedbb1, predicate.and((entity1) -> {
+ // Paper start
+ Predicate<Entity> effectivePredicate = predicate.and((entity1) -> {
return entity == null || !entity.isSameVehicle(entity1);
- })).stream().flatMap((entity1) -> {
+ });
+
+ return ((entity != null && entity.hardCollides()) ? this.getEntities(entity, axisalignedbb, effectivePredicate) : this.getHardCollidingEntities(entity, axisalignedbb1, effectivePredicate)).stream().flatMap((entity1) -> {
if (entity != null) {
- AxisAlignedBB axisalignedbb2 = entity.j(entity1);
+ AxisAlignedBB axisalignedbb2 = entity.j(entity1); // Paper - diff on change, hard collision box method
if (axisalignedbb2 != null && axisalignedbb2.c(axisalignedbb1)) {
return Stream.of(entity1.ay(), axisalignedbb2);
}
}
- return Stream.of(entity1.ay());
+ return Stream.of(entity1.ay()); // Paper - diff on change, hard collision box method
}).filter(Objects::nonNull).map(VoxelShapes::a);
}
}
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index bcfa630ae8d7a1454ea2f8e6e88b8902cb586467..24047e02c0232217be6ced5708daef754d74e280 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1111,6 +1111,32 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
return this.getChunkAt(i, j, ChunkStatus.FULL, false);
}
+ // Paper start - optimise hard collision handling
+ @Override
+ public List<Entity> getHardCollidingEntities(@Nullable Entity entity, AxisAlignedBB axisalignedbb, Predicate<Entity> predicate) {
+ // copied from below
+ List<Entity> list = Lists.newArrayList();
+ int i = MathHelper.floor((axisalignedbb.minX - 2.0D) / 16.0D);
+ int j = MathHelper.floor((axisalignedbb.maxX + 2.0D) / 16.0D);
+ int k = MathHelper.floor((axisalignedbb.minZ - 2.0D) / 16.0D);
+ int l = MathHelper.floor((axisalignedbb.maxZ + 2.0D) / 16.0D);
+
+ ChunkProviderServer chunkProvider = ((WorldServer)this).getChunkProvider();
+
+ for (int i1 = i; i1 <= j; ++i1) {
+ for (int j1 = k; j1 <= l; ++j1) {
+ Chunk chunk = chunkProvider.getChunkAtIfLoadedMainThread(i1, j1);
+
+ if (chunk != null) {
+ chunk.getHardCollidingEntities(entity, axisalignedbb, list, predicate);
+ }
+ }
+ }
+
+ return list;
+ }
+ // Paper end - optimise hard collision handling
+
@Override
public List<Entity> getEntities(@Nullable Entity entity, AxisAlignedBB axisalignedbb, @Nullable Predicate<? super Entity> predicate) {
this.getMethodProfiler().c("getEntities");
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