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PaperMC/patches/server/1052-Optimise-collision-checking-in-player-move-packet-ha.patch
Spottedleaf 8c5b837e05 Rework async chunk api implementation 
Firstly, the old methods all routed to the CompletableFuture method.
However, the CF method could not guarantee that if the caller
was off-main that the future would be "completed" on-main. Since
the callback methods used the CF one, this meant that the callback
methods did not guarantee that the callbacks were to be called on
the main thread.

Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb)
so that the methods with the callback are guaranteed to invoke
the callback on the main thread. The CF behavior remains unchanged;
it may still appear to complete on main if invoked off-main.

Secondly, remove the scheduleOnMain invocation in the async
chunk completion. This unnecessarily delays the callback
by 1 tick.

Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which
will load chunks within an area. This method is provided as a helper
as keeping all chunks loaded within an area can be complicated to
implement for plugins (due to the lacking ticket API), and is
already implemented internally anyways.

Fourthly, remove the ticket addition that occured with getChunkAt
and getChunkAtAsync. The ticket addition may delay the unloading
of the chunk unnecessarily. It also fixes a very rare timing bug
where the future/callback would be completed after the chunk
unloads.
2024-11-18 23:00:59 -08:00

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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
Feature patch
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index e3458038d56b7133f991a5198db26398a299bf30..d7ac001d53a083e9881f2320eb7fd5dcbd20416e 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -577,7 +577,7 @@ 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
@@ -593,6 +593,7 @@ 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();
@@ -606,15 +607,23 @@ 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)});
}
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));
@@ -697,7 +706,32 @@ 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
@@ -1398,7 +1432,7 @@ 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
@@ -1440,6 +1474,7 @@ 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.
@@ -1470,7 +1505,17 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
}
// Paper start - Add fail move event
- boolean teleportBack = !this.player.noPhysics && !this.player.isSleeping() && (movedWrongly && worldserver.noCollision(this.player, axisalignedbb) || this.isPlayerCollidingWithAnythingNew(worldserver, axisalignedbb, d0, d1, d2));
+ // Paper start - optimise out extra getCubes
+ boolean teleportBack = !this.player.noPhysics && !this.player.isSleeping() && movedWrongly;
+ this.player.absMoveTo(d0, d1, d2, f, f1); // prevent desync by tping to the set position, dropped for unknown reasons by mojang
+ 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?
+ }
+ // Paper end - optimise out extra getCubes
if (teleportBack) {
io.papermc.paper.event.player.PlayerFailMoveEvent event = fireFailMove(io.papermc.paper.event.player.PlayerFailMoveEvent.FailReason.CLIPPED_INTO_BLOCK,
toX, toY, toZ, toYaw, toPitch, false);
@@ -1594,7 +1639,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
private boolean updateAwaitingTeleport() {
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());
}
@@ -1607,6 +1652,33 @@ 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<>();
+ ca.spottedleaf.moonrise.patches.collisions.CollisionUtil.getCollisions(
+ world, entity, newBox, collisionsVoxel, collisionsBB,
+ ca.spottedleaf.moonrise.patches.collisions.CollisionUtil.COLLISION_FLAG_COLLIDE_WITH_UNLOADED_CHUNKS | ca.spottedleaf.moonrise.patches.collisions.CollisionUtil.COLLISION_FLAG_CHECK_BORDER,
+ null, null
+ );
+
+ for (int i = 0, len = collisionsBB.size(); i < len; ++i) {
+ final AABB box = collisionsBB.get(i);
+ if (!ca.spottedleaf.moonrise.patches.collisions.CollisionUtil.voxelShapeIntersect(box, oldBox)) {
+ return true;
+ }
+ }
+
+ for (int i = 0, len = collisionsVoxel.size(); i < len; ++i) {
+ final VoxelShape voxel = collisionsVoxel.get(i);
+ if (!ca.spottedleaf.moonrise.patches.collisions.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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