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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 0d7a2812ec739dbde52b551834a88a7c516cea13..8346592e75e0d719cbec0e03bff0864990c0a47c 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 82042830979c5d7e39dc03f5ac4fe1c3199fdebb..f8a7ddeb70a1708805f22a1fd23e44f8906ea507 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 ada3364150e55273cc699889e3a98cf0b9680219..7342bdaa5f1cc0ae6a889149d45a97b6597a1e5b 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1106,6 +1106,32 @@ 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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