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Paper-Old/patches/server/0718-Optimise-collision-checking-in-player-move-packet-ha.patch
Nassim Jahnke e035fd7034
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:
cc9aa21a SPIGOT-6399, SPIGOT-7344: Clarify collidable behavior for player entities
f23325b6 Add API for per-world simulation distances
26e1774e Add API for per-world view distances
0b541e60 Add PlayerLoginEvent#getRealAddress
5f027d2d PR-949: Add Vector#fromJOML() overloads for read-only vector types

CraftBukkit Changes:
bcf56171a PR-1321: Clean up some stuff which got missed during previous PRs
7f833a2d1 SPIGOT-7462: Players no longer drop XP after dying near a Sculk Catalyst
752aac669 Implement APIs for per world view and simulation distances
57d7ef433 Preserve empty enchantment tags for glow effect
465ec3fb4 Remove connected check on setScoreboard
f90ce621e Use one PermissibleBase for all command blocks
5876cca44 SPIGOT-7550: Fix creation of Arrow instances
f03fc3aa3 SPIGOT-7549: ServerTickManager#setTickRate incorrect Precondition
9d7f49b01 SPIGOT-7548: Fix wrong spawn location for experience orb and dropped item

Spigot Changes:
ed9ba9a4 Drop no longer required patch ignoring -o option
86b5dd6a SPIGOT-7546: Fix hardcoded check for outdated client message
aa7cde7a Remove obsolete APIs for per world view and simulation distances
6dff577e Remove obsolete patch preserving empty `ench` tags
a3bf95b8 Remove obsolete PlayerLoginEvent#getRealAddress
1b02f5d6 Remove obsolete connected check on setScoreboard patch
acf717eb Remove obsolete command block PermissibleBase patch
053fa2a9 Remove redundant patch dealing with null tile entities
2023-12-26 00:18:13 +01:00

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Originalformat Blame Verlauf

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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
CHECK ME
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 0b745f852976611a12834101adccae52453d7dce..adc87248cbd7af37aec299f1d7c9a10965c9de30 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -537,7 +537,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
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
@@ -553,6 +553,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
}
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();
@@ -566,16 +567,24 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
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.send(new ClientboundMoveVehiclePacket(entity));
@@ -661,7 +670,32 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
}
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
@@ -1260,7 +1294,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
}
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());
}
@@ -1355,7 +1389,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
}
}
- AABB axisalignedbb = this.player.getBoundingBox();
+ AABB axisalignedbb = this.player.getBoundingBox(); // Paper - diff on change, should be old AABB
d6 = d0 - this.lastGoodX; // Paper - diff on change, used for checking large move vectors above
d7 = d1 - this.lastGoodY; // Paper - diff on change, used for checking large move vectors above
@@ -1397,6 +1431,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
this.player.move(MoverType.PLAYER, new Vec3(d6, d7, d8));
this.player.onGround = packet.isOnGround(); // CraftBukkit - SPIGOT-5810, SPIGOT-5835, SPIGOT-6828: reset by this.player.move
+ 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...
// Paper start - prevent position desync
if (this.awaitingPositionFromClient != null) {
return; // ... thanks Mojang for letting move calls teleport across dimensions.
@@ -1415,11 +1450,23 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
boolean flag2 = false;
if (!this.player.isChangingDimension() && d10 > 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());
}
- if (!this.player.noPhysics && !this.player.isSleeping() && (flag2 && worldserver.noCollision(this.player, axisalignedbb) || this.isPlayerCollidingWithAnythingNew(worldserver, axisalignedbb, d0, d1, d2))) {
+ // Paper start - optimise out extra getCubes
+ this.player.absMoveTo(d0, d1, d2, f, f1); // prevent desync by tping to the set position, dropped for unknown reasons by mojang
+ // 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.internalTeleport(d3, d4, d5, f, f1, Collections.emptySet()); // CraftBukkit - SPIGOT-1807: Don't call teleport event, when the client thinks the player is falling, because the chunks are not loaded on the client yet.
this.player.doCheckFallDamage(this.player.getX() - d3, this.player.getY() - d4, this.player.getZ() - d5, packet.isOnGround());
} else {
@@ -1505,6 +1552,33 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
}
}
+ // Paper start - optimise out extra getCubes
+ private boolean hasNewCollision(final ServerLevel world, final Entity entity, final AABB oldBox, final AABB newBox) {
+ final List<AABB> collisionsBB = new java.util.ArrayList<>();
+ final List<VoxelShape> collisionsVoxel = new java.util.ArrayList<>();
+ io.papermc.paper.util.CollisionUtil.getCollisions(
+ world, entity, newBox, collisionsVoxel, collisionsBB,
+ io.papermc.paper.util.CollisionUtil.COLLISION_FLAG_COLLIDE_WITH_UNLOADED_CHUNKS | io.papermc.paper.util.CollisionUtil.COLLISION_FLAG_CHECK_BORDER,
+ null, null
+ );
+
+ for (int i = 0, len = collisionsBB.size(); i < len; ++i) {
+ final AABB box = collisionsBB.get(i);
+ if (!io.papermc.paper.util.CollisionUtil.voxelShapeIntersect(box, oldBox)) {
+ return true;
+ }
+ }
+
+ for (int i = 0, len = collisionsVoxel.size(); i < len; ++i) {
+ final VoxelShape voxel = collisionsVoxel.get(i);
+ if (!io.papermc.paper.util.CollisionUtil.voxelShapeIntersectNoEmpty(voxel, oldBox)) {
+ return true;
+ }
+ }
+
+ return false;
+ }
+ // Paper end - optimise out extra getCubes
private boolean isPlayerCollidingWithAnythingNew(LevelReader world, AABB box, double newX, double newY, double newZ) {
AABB axisalignedbb1 = this.player.getBoundingBox().move(newX - this.player.getX(), newY - this.player.getY(), newZ - this.player.getZ());
Iterable<VoxelShape> iterable = world.getCollisions(this.player, axisalignedbb1.deflate(9.999999747378752E-6D));
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