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18f0f8d1ca
Paper/patches/server/0809-Optimise-collision-checking-in-player-move-packet-ha.patch
Nassim Jahnke 18f0f8d1ca
Updated Upstream (Bukkit/CraftBukkit/Spigot) 
Upstream has released updates that appear 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:
312281ea PR-742: Make World implement Keyed

CraftBukkit Changes:
2ac7fa7a SPIGOT-7014: getLootTable API should not persistently update loot table
7fdd7941 PR-1046: Make World implement Keyed
7bc728a6 PR-1045: Revert changes to persistence required checks

Spigot Changes:
b6d12d17 Rebuild patches
2022-05-09 11:03:07 +02:00

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Raw Blame History

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <spottedleaf@spottedleaf.dev>
Date: Thu, 2 Jul 2020 12:02:43 -0700
Subject: [PATCH] Optimise collision checking in player move packet handling
Move collision logic to just the hasNewCollision call instead of getCubes + hasNewCollision
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 7be8b98a61c3d92ef7c473983fe620047a137630..761a87be91e82841632f4f46dec799ae28f05887 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -587,7 +587,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
return;
}
- boolean flag = worldserver.noCollision(entity, entity.getBoundingBox().deflate(0.0625D));
+ AABB oldBox = entity.getBoundingBox(); // Paper - copy from player movement packet
d6 = d3 - this.vehicleLastGoodX; // Paper - diff on change, used for checking large move vectors above
d7 = d4 - this.vehicleLastGoodY - 1.0E-6D; // Paper - diff on change, used for checking large move vectors above
@@ -595,6 +595,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
boolean flag1 = entity.verticalCollisionBelow;
entity.move(MoverType.PLAYER, new Vec3(d6, d7, d8));
+ boolean didCollide = toX != entity.getX() || toY != entity.getY() || toZ != entity.getZ(); // Paper - needed here as the difference in Y can be reset - also note: this is only a guess at whether collisions took place, floating point errors can make this true when it shouldn't be...
double d11 = d7;
d6 = d3 - entity.getX();
@@ -608,16 +609,24 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
boolean flag2 = false;
if (d10 > org.spigotmc.SpigotConfig.movedWronglyThreshold) { // Spigot
- flag2 = true;
+ flag2 = true; // Paper - diff on change, this should be moved wrongly
ServerGamePacketListenerImpl.LOGGER.warn("{} (vehicle of {}) moved wrongly! {}", new Object[]{entity.getName().getString(), this.player.getName().getString(), Math.sqrt(d10)});
}
Location curPos = this.getCraftPlayer().getLocation(); // Spigot
entity.absMoveTo(d3, d4, d5, f, f1);
this.player.absMoveTo(d3, d4, d5, this.player.getYRot(), this.player.getXRot()); // CraftBukkit
- boolean flag3 = worldserver.noCollision(entity, entity.getBoundingBox().deflate(0.0625D));
- if (flag && (flag2 || !flag3)) {
+ // Paper start - optimise out extra getCubes
+ boolean teleportBack = flag2; // violating this is always a fail
+ if (!teleportBack) {
+ // note: only call after setLocation, or else getBoundingBox is wrong
+ AABB newBox = entity.getBoundingBox();
+ if (didCollide || !oldBox.equals(newBox)) {
+ teleportBack = this.hasNewCollision(worldserver, entity, oldBox, newBox);
+ } // else: no collision at all detected, why do we care?
+ }
+ if (teleportBack) { // Paper end - optimise out extra getCubes
entity.absMoveTo(d0, d1, d2, f, f1);
this.player.absMoveTo(d0, d1, d2, this.player.getYRot(), this.player.getXRot()); // CraftBukkit
this.connection.send(new ClientboundMoveVehiclePacket(entity));
@@ -703,7 +712,32 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
}
private boolean noBlocksAround(Entity entity) {
- return entity.level.getBlockStates(entity.getBoundingBox().inflate(0.0625D).expandTowards(0.0D, -0.55D, 0.0D)).allMatch(BlockBehaviour.BlockStateBase::isAir);
+ // Paper start - stop using streams, this is already a known fixed problem in Entity#move
+ AABB box = entity.getBoundingBox().inflate(0.0625D).expandTowards(0.0D, -0.55D, 0.0D);
+ int minX = Mth.floor(box.minX);
+ int minY = Mth.floor(box.minY);
+ int minZ = Mth.floor(box.minZ);
+ int maxX = Mth.floor(box.maxX);
+ int maxY = Mth.floor(box.maxY);
+ int maxZ = Mth.floor(box.maxZ);
+
+ Level world = entity.level;
+ BlockPos.MutableBlockPos pos = new BlockPos.MutableBlockPos();
+
+ for (int y = minY; y <= maxY; ++y) {
+ for (int z = minZ; z <= maxZ; ++z) {
+ for (int x = minX; x <= maxX; ++x) {
+ pos.set(x, y, z);
+ BlockState type = world.getBlockStateIfLoaded(pos);
+ if (type != null && !type.isAir()) {
+ return false;
+ }
+ }
+ }
+ }
+
+ return true;
+ // Paper end - stop using streams, this is already a known fixed problem in Entity#move
}
@Override
@@ -1251,7 +1285,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
}
if (this.awaitingPositionFromClient != null) {
- if (this.tickCount - this.awaitingTeleportTime > 20) {
+ if (false && this.tickCount - this.awaitingTeleportTime > 20) { // Paper - this will greatly screw with clients with > 1000ms RTT
this.awaitingTeleportTime = this.tickCount;
this.teleport(this.awaitingPositionFromClient.x, this.awaitingPositionFromClient.y, this.awaitingPositionFromClient.z, this.player.getYRot(), this.player.getXRot());
}
@@ -1345,7 +1379,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
}
}
- AABB axisalignedbb = this.player.getBoundingBox();
+ AABB axisalignedbb = this.player.getBoundingBox(); // Paper - diff on change, should be old AABB
d7 = d0 - this.lastGoodX; // Paper - diff on change, used for checking large move vectors above
d8 = d1 - this.lastGoodY; // Paper - diff on change, used for checking large move vectors above
@@ -1386,6 +1420,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
boolean flag1 = this.player.verticalCollisionBelow;
this.player.move(MoverType.PLAYER, new Vec3(d7, d8, d9));
+ boolean didCollide = toX != this.player.getX() || toY != this.player.getY() || toZ != this.player.getZ(); // Paper - needed here as the difference in Y can be reset - also note: this is only a guess at whether collisions took place, floating point errors can make this true when it shouldn't be...
this.player.onGround = packet.isOnGround(); // CraftBukkit - SPIGOT-5810, SPIGOT-5835, SPIGOT-6828: reset by this.player.move
// Paper start - prevent position desync
if (this.awaitingPositionFromClient != null) {
@@ -1405,12 +1440,23 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
boolean flag2 = false;
if (!this.player.isChangingDimension() && d11 > org.spigotmc.SpigotConfig.movedWronglyThreshold && !this.player.isSleeping() && !this.player.gameMode.isCreative() && this.player.gameMode.getGameModeForPlayer() != GameType.SPECTATOR) { // Spigot
- flag2 = true;
+ flag2 = true; // Paper - diff on change, this should be moved wrongly
ServerGamePacketListenerImpl.LOGGER.warn("{} moved wrongly!", this.player.getName().getString());
}
this.player.absMoveTo(d0, d1, d2, f, f1);
- if (!this.player.noPhysics && !this.player.isSleeping() && (flag2 && worldserver.noCollision(this.player, axisalignedbb) || this.isPlayerCollidingWithAnythingNew(worldserver, axisalignedbb))) {
+ // Paper start - optimise out extra getCubes
+ // Original for reference:
+ // boolean teleportBack = flag2 && worldserver.getCubes(this.player, axisalignedbb) || (didCollide && this.a((IWorldReader) worldserver, axisalignedbb));
+ boolean teleportBack = flag2; // violating this is always a fail
+ if (!this.player.noPhysics && !this.player.isSleeping() && !teleportBack) {
+ AABB newBox = this.player.getBoundingBox();
+ if (didCollide || !axisalignedbb.equals(newBox)) {
+ // note: only call after setLocation, or else getBoundingBox is wrong
+ teleportBack = this.hasNewCollision(worldserver, this.player, axisalignedbb, newBox);
+ } // else: no collision at all detected, why do we care?
+ }
+ if (!this.player.noPhysics && !this.player.isSleeping() && teleportBack) { // Paper end - optimise out extra getCubes
this.teleport(d3, d4, d5, f, f1);
} else {
// CraftBukkit start - fire PlayerMoveEvent
@@ -1496,6 +1542,27 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
}
}
+ // Paper start - optimise out extra getCubes
+ private boolean hasNewCollision(final ServerLevel world, final Entity entity, final AABB oldBox, final AABB newBox) {
+ final List<AABB> collisions = io.papermc.paper.util.CachedLists.getTempCollisionList();
+ try {
+ io.papermc.paper.util.CollisionUtil.getCollisions(world, entity, newBox, collisions, false, true,
+ true, false, null, null);
+
+ for (int i = 0, len = collisions.size(); i < len; ++i) {
+ final AABB box = collisions.get(i);
+ if (!io.papermc.paper.util.CollisionUtil.voxelShapeIntersect(box, oldBox)) {
+ return true;
+ }
+ }
+
+ return false;
+ } finally {
+ io.papermc.paper.util.CachedLists.returnTempCollisionList(collisions);
+ }
+ }
+ // Paper end - optimise out extra getCubes
+
private boolean isPlayerCollidingWithAnythingNew(LevelReader world, AABB box) {
Iterable<VoxelShape> iterable = world.getCollisions(this.player, this.player.getBoundingBox().deflate(9.999999747378752E-6D));
VoxelShape voxelshape = Shapes.create(box.deflate(9.999999747378752E-6D));
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