Paper/patches/server/0444-Reduce-allocation-of-Vec3D-by-entity-tracker.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <spottedleaf@spottedleaf.dev>
Date: Mon, 27 Apr 2020 00:04:16 -0700
Subject: [PATCH] Reduce allocation of Vec3D by entity tracker
diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
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index 1b2e7af2824cecc5010f2beefa4f5b838c5ca09d..a1529fef41543486d29271b1de62a6246d07d384 100644
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--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
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@@ -2147,9 +2147,14 @@ Sections go from 0..16. Now whenever a section is not empty, it can potentially
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public void updatePlayer(ServerPlayer player) {
org.spigotmc.AsyncCatcher.catchOp("player tracker update"); // Spigot
if (player != this.entity) {
- Vec3 vec3d = player.position().subtract(this.entity.position()); // MC-155077, SPIGOT-5113
+ // Paper start - remove allocation of Vec3D here
+ //Vec3D vec3d = entityplayer.getPositionVector().d(this.tracker.getPositionVector()); // MC-155077, SPIGOT-5113
+ double vec3d_dx = player.getX() - this.entity.getX();
+ double vec3d_dy = player.getY() - this.entity.getY();
+ double vec3d_dz = player.getZ() - this.entity.getZ();
+ // Paper end - remove allocation of Vec3D here
int i = Math.min(this.getEffectiveRange(), (ChunkMap.this.viewDistance - 1) * 16);
- boolean flag = vec3d.x >= (double) (-i) && vec3d.x <= (double) i && vec3d.z >= (double) (-i) && vec3d.z <= (double) i && this.entity.broadcastToPlayer(player);
+ boolean flag = vec3d_dx >= (double) (-i) && vec3d_dx <= (double) i && vec3d_dz >= (double) (-i) && vec3d_dz <= (double) i && this.entity.broadcastToPlayer(player); // Paper - remove allocation of Vec3D here
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// CraftBukkit start - respect vanish API
if (this.entity instanceof ServerPlayer) {
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diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
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index 58cae4202e61cded7d5dfa9652bbfb9735927f7e..2f3e69ad809199ffc2661d524bb627ec8dbc2e80 100644
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--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
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@@ -144,8 +144,12 @@ public class ServerEntity {
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++this.teleportDelay;
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i = Mth.floor(this.entity.getYRot() * 256.0F / 360.0F);
j = Mth.floor(this.entity.getXRot() * 256.0F / 360.0F);
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- Vec3 vec3d = this.entity.position().subtract(ClientboundMoveEntityPacket.packetToEntity(this.xp, this.yp, this.zp));
- boolean flag1 = vec3d.lengthSqr() >= 7.62939453125E-6D;
+ // Paper start - reduce allocation of Vec3D here
+ double vec3d_dx = this.entity.getX() - 2.44140625E-4D*(this.xp);
+ double vec3d_dy = this.entity.getY() - 2.44140625E-4D*(this.yp);
+ double vec3d_dz = this.entity.getZ() - 2.44140625E-4D*(this.zp);
+ boolean flag1 = (vec3d_dx * vec3d_dx + vec3d_dy * vec3d_dy + vec3d_dz * vec3d_dz) >= 7.62939453125E-6D;
+ // Paper end - reduce allocation of Vec3D here
Packet<?> packet1 = null;
boolean flag2 = flag1 || this.tickCount % 60 == 0;
boolean flag3 = Math.abs(i - this.yRotp) >= 1 || Math.abs(j - this.xRotp) >= 1;
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@@ -162,9 +166,11 @@ public class ServerEntity {
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// CraftBukkit end
if (this.tickCount > 0 || this.entity instanceof AbstractArrow) {
- long k = ClientboundMoveEntityPacket.entityToPacket(vec3d.x);
- long l = ClientboundMoveEntityPacket.entityToPacket(vec3d.y);
- long i1 = ClientboundMoveEntityPacket.entityToPacket(vec3d.z);
+ // Paper start - remove allocation of Vec3D here
+ long k = ClientboundMoveEntityPacket.entityToPacket(vec3d_dx);
+ long l = ClientboundMoveEntityPacket.entityToPacket(vec3d_dy);
+ long i1 = ClientboundMoveEntityPacket.entityToPacket(vec3d_dz);
+ // Paper end - remove allocation of Vec3D here
boolean flag4 = k < -32768L || k > 32767L || l < -32768L || l > 32767L || i1 < -32768L || i1 > 32767L;
if (!flag4 && this.teleportDelay <= 400 && !this.wasRiding && this.wasOnGround == this.entity.isOnGround()) {