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-rw-r--r--patches/server/0990-Optimize-Collision-to-not-load-chunks.patch109
1 files changed, 109 insertions, 0 deletions
diff --git a/patches/server/0990-Optimize-Collision-to-not-load-chunks.patch b/patches/server/0990-Optimize-Collision-to-not-load-chunks.patch
new file mode 100644
index 0000000000..17286aaa99
--- /dev/null
+++ b/patches/server/0990-Optimize-Collision-to-not-load-chunks.patch
@@ -0,0 +1,109 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <[email protected]>
+Date: Thu, 2 Apr 2020 02:37:57 -0400
+Subject: [PATCH] Optimize Collision to not load chunks
+
+The collision code takes an AABB and generates a cuboid of checks rather
+than a cylinder, so at high velocity this can generate a lot of chunk checks.
+
+Treat an unloaded chunk as a collision for entities, and also for players if
+the "prevent moving into unloaded chunks" setting is enabled.
+
+If that serting is not enabled, collisions will be ignored for players, since
+movement will load only the chunk the player enters anyways and avoids loading
+massive amounts of surrounding chunks due to large AABB lookups.
+
+diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
+index 8f1a2de2a5542929f8a2fdd4d38de141eda985b2..29b35b8c0a6001d626e327a82eaff26d068660db 100644
+--- a/src/main/java/net/minecraft/server/players/PlayerList.java
++++ b/src/main/java/net/minecraft/server/players/PlayerList.java
+@@ -934,6 +934,7 @@ public abstract class PlayerList {
+ entityplayer1.setShiftKeyDown(false);
+ entityplayer1.forceSetPositionRotation(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
+
++ worldserver1.getChunkSource().addRegionTicket(net.minecraft.server.level.TicketType.POST_TELEPORT, new net.minecraft.world.level.ChunkPos(location.getBlockX() >> 4, location.getBlockZ() >> 4), 1, entityplayer.getId()); // Paper
+ while (avoidSuffocation && !worldserver1.noCollision((Entity) entityplayer1) && entityplayer1.getY() < (double) worldserver1.getMaxBuildHeight()) {
+ // CraftBukkit end
+ entityplayer1.setPos(entityplayer1.getX(), entityplayer1.getY() + 1.0D, entityplayer1.getZ());
+diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
+index a13edd1165a5ba4dd3f5c323e454926e7fe75c07..b57644317b5085d74d11ac6ba858c3747d703a47 100644
+--- a/src/main/java/net/minecraft/world/entity/Entity.java
++++ b/src/main/java/net/minecraft/world/entity/Entity.java
+@@ -245,6 +245,7 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
+ public org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason spawnReason; // Paper - Entity#getEntitySpawnReason
+
+ public com.destroystokyo.paper.loottable.PaperLootableInventoryData lootableData; // Paper
++ public boolean collisionLoadChunks = false; // Paper
+ private CraftEntity bukkitEntity;
+
+ public @org.jetbrains.annotations.Nullable net.minecraft.server.level.ChunkMap.TrackedEntity tracker; // Paper
+diff --git a/src/main/java/net/minecraft/world/level/BlockCollisions.java b/src/main/java/net/minecraft/world/level/BlockCollisions.java
+index 1c10835b59aaefa3a65ff64f784620bdc54ddcdc..cd89623a44f02d7db77f0d0f87545cf80841f403 100644
+--- a/src/main/java/net/minecraft/world/level/BlockCollisions.java
++++ b/src/main/java/net/minecraft/world/level/BlockCollisions.java
+@@ -66,18 +66,37 @@ public class BlockCollisions<T> extends AbstractIterator<T> {
+ @Override
+ protected T computeNext() {
+ while (this.cursor.advance()) {
+- int i = this.cursor.nextX();
+- int j = this.cursor.nextY();
+- int k = this.cursor.nextZ();
++ int i = this.cursor.nextX(); final int x = i; // Paper - OBFHELPER
++ int j = this.cursor.nextY(); final int y = j; // Paper - OBFHELPER
++ int k = this.cursor.nextZ(); final int z = k; // Paper - OBFHELPER
+ int l = this.cursor.getNextType();
+ if (l != 3) {
+- BlockGetter blockGetter = this.getChunk(i, k);
+- if (blockGetter != null) {
+- this.pos.set(i, j, k);
+- BlockState blockState = blockGetter.getBlockState(this.pos);
+- if ((!this.onlySuffocatingBlocks || blockState.isSuffocating(blockGetter, this.pos))
+- && (l != 1 || blockState.hasLargeCollisionShape())
+- && (l != 2 || blockState.is(Blocks.MOVING_PISTON))) {
++ // Paper start - ensure we don't load chunks
++ // BlockGetter blockGetter = this.getChunk(i, k);
++ if (true) {
++ final @Nullable Entity source = this.context instanceof net.minecraft.world.phys.shapes.EntityCollisionContext entityContext ? entityContext.getEntity() : null;
++ boolean far = source != null && io.papermc.paper.util.MCUtil.distanceSq(source.getX(), y, source.getZ(), x, y, z) > 14;
++ this.pos.set(x, y, z);
++ BlockState blockState;
++ if (this.collisionGetter instanceof net.minecraft.server.level.WorldGenRegion) {
++ BlockGetter blockGetter = this.getChunk(x, z);
++ if (blockGetter == null) {
++ continue;
++ }
++ blockState = blockGetter.getBlockState(this.pos);
++ } else if ((!far && source instanceof net.minecraft.server.level.ServerPlayer) || (source != null && source.collisionLoadChunks)) {
++ blockState = this.collisionGetter.getBlockState(this.pos);
++ } else {
++ blockState = this.collisionGetter.getBlockStateIfLoaded(this.pos);
++ }
++ if (blockState == null) {
++ if (!(source instanceof net.minecraft.server.level.ServerPlayer) || source.level().paperConfig().chunks.preventMovingIntoUnloadedChunks) {
++ return this.resultProvider.apply(new BlockPos.MutableBlockPos(x, y, z), Shapes.create(far ? source.getBoundingBox() : new AABB(new BlockPos(x, y, z))));
++ }
++ continue;
++ }
++ if (/*(!this.onlySuffocatingBlocks || blockState.isSuffocating(blockGetter, this.pos)) &&*/ (l != 1 || blockState.hasLargeCollisionShape()) && (l != 2 || blockState.is(Blocks.MOVING_PISTON))) { // Paper - onlySuffocatingBlocks is only true on the client, so we don't care about it here
++ // Paper end
+ VoxelShape voxelShape = blockState.getCollisionShape(this.collisionGetter, this.pos, this.context);
+ if (voxelShape == Shapes.block()) {
+ if (this.box.intersects((double)i, (double)j, (double)k, (double)i + 1.0, (double)j + 1.0, (double)k + 1.0)) {
+diff --git a/src/main/java/net/minecraft/world/level/CollisionGetter.java b/src/main/java/net/minecraft/world/level/CollisionGetter.java
+index e57cb7fe53e915d24246e44c7f49971f5b2ab2cf..1ad0c976c6e2d6d31397dff850a9de7c16d16fba 100644
+--- a/src/main/java/net/minecraft/world/level/CollisionGetter.java
++++ b/src/main/java/net/minecraft/world/level/CollisionGetter.java
+@@ -44,11 +44,13 @@ public interface CollisionGetter extends BlockGetter {
+ }
+
+ default boolean noCollision(@Nullable Entity entity, AABB box) {
++ try { if (entity != null) entity.collisionLoadChunks = true; // Paper
+ for (VoxelShape voxelShape : this.getBlockCollisions(entity, box)) {
+ if (!voxelShape.isEmpty()) {
+ return false;
+ }
+ }
++ } finally { if (entity != null) entity.collisionLoadChunks = false; } // Paper
+
+ if (!this.getEntityCollisions(entity, box).isEmpty()) {
+ return false;