SakuraMC/patches/server/0010-Load-Chunks-on-Movement.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samsuik <kfian294ma4@gmail.com>
Date: Sat, 11 Sep 2021 19:19:41 +0100
Subject: [PATCH] Load Chunks on Movement


diff --git a/src/main/java/io/papermc/paper/util/CollisionUtil.java b/src/main/java/io/papermc/paper/util/CollisionUtil.java
index ee0331a6bc40cdde08d926fd8eb1dc642630c2e5..57ca8212991d0660dd41b70350f59830d4fd09f3 100644
--- a/src/main/java/io/papermc/paper/util/CollisionUtil.java
+++ b/src/main/java/io/papermc/paper/util/CollisionUtil.java
@@ -1569,6 +1569,7 @@ public final class CollisionUtil {
     public static final int COLLISION_FLAG_COLLIDE_WITH_UNLOADED_CHUNKS = 1 << 1;
     public static final int COLLISION_FLAG_CHECK_BORDER = 1 << 2;
     public static final int COLLISION_FLAG_CHECK_ONLY = 1 << 3;
+    public static final int COLLISION_FLAG_ADD_TICKET = 1 << 4; // Sakura
 
     public static boolean getCollisionsForBlocksOrWorldBorder(final Level world, final Entity entity, final AABB aabb,
                                                               final List<VoxelShape> intoVoxel, final List<AABB> intoAABB,
@@ -1619,11 +1620,20 @@ public final class CollisionUtil {
         final int maxChunkZ = maxBlockZ >> 4;
 
         final boolean loadChunks = (collisionFlags & COLLISION_FLAG_LOAD_CHUNKS) != 0;
+        final boolean addTicket  = (collisionFlags & COLLISION_FLAG_ADD_TICKET) != 0; // Sakura
         final ServerChunkCache chunkSource = (ServerChunkCache)world.getChunkSource();
 
         for (int currChunkZ = minChunkZ; currChunkZ <= maxChunkZ; ++currChunkZ) {
             for (int currChunkX = minChunkX; currChunkX <= maxChunkX; ++currChunkX) {
                 final ChunkAccess chunk = loadChunks ? chunkSource.getChunk(currChunkX, currChunkZ, ChunkStatus.FULL, true) : chunkSource.getChunkAtIfLoadedImmediately(currChunkX, currChunkZ);
+                // Sakura start - keep chunks loaded on movement
+                if (addTicket) {
+                    chunkSource.chunkMap.getDistanceManager().getChunkHolderManager().addTicketAtLevel(net.minecraft.server.level.TicketType.ENTITY_MOVEMENT, currChunkX, currChunkZ, 33, CoordinateUtils.getChunkKey(currChunkX, currChunkZ));
+                    // This is known to work, uncomment if any issues
+                    // var pos = new net.minecraft.world.level.ChunkPos(currChunkX, currChunkZ);
+                    // chunkSource.addTicketAtLevel(net.minecraft.server.level.TicketType.ENTITY_MOVEMENT, pos, 33, pos.toLong());
+                }
+                // Sakura end
 
                 if (chunk == null) {
                     if ((collisionFlags & COLLISION_FLAG_COLLIDE_WITH_UNLOADED_CHUNKS) != 0) {
diff --git a/src/main/java/net/minecraft/server/level/TicketType.java b/src/main/java/net/minecraft/server/level/TicketType.java
index 658e63ebde81dc14c8ab5850fb246dc0aab25dea..f1ff1a67fee37ee7b241ceaa164fa4ee64d3767b 100644
--- a/src/main/java/net/minecraft/server/level/TicketType.java
+++ b/src/main/java/net/minecraft/server/level/TicketType.java
@@ -37,6 +37,7 @@ public class TicketType<T> {
     public static final TicketType<Long> NON_FULL_SYNC_LOAD = create("non_full_sync_load", Long::compareTo);
     public static final TicketType<ChunkPos> DELAY_UNLOAD = create("delay_unload", Comparator.comparingLong(ChunkPos::toLong), 1);
     // Paper end - rewrite chunk system
+    public static final TicketType<Long> ENTITY_MOVEMENT = create("entity_movement", Long::compareTo, 10 * 20); // Sakura
 
     public static <T> TicketType<T> create(String name, Comparator<T> argumentComparator) {
         return new TicketType<>(name, argumentComparator, 0L);
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 4ffa96f7eeefd6a2a07458f68458cdbf4369340f..583f94cd4f517f17909da43f546e8c9e4580d3ad 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -537,6 +537,19 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S
     // Paper end - make end portalling safe
     public boolean isPrimedTNT; // Sakura
     public boolean isFallingBlock; // Sakura
+    // Sakura start
+    protected boolean loadChunks = false;
+
+    private int getExtraCollisionFlags() {
+        int flags = 0;
+        
+        if (this.loadChunks) {
+            flags |= io.papermc.paper.util.CollisionUtil.COLLISION_FLAG_LOAD_CHUNKS | io.papermc.paper.util.CollisionUtil.COLLISION_FLAG_ADD_TICKET;
+        }
+
+        return flags;
+    }
+    // Sakura end
 
     public boolean isLegacyTrackingEntity = false;
 
@@ -1494,7 +1507,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S
 
         io.papermc.paper.util.CollisionUtil.getCollisions(
                 world, this, collisionBox, potentialCollisionsVoxel, potentialCollisionsBB,
-                io.papermc.paper.util.CollisionUtil.COLLISION_FLAG_CHECK_BORDER,
+                io.papermc.paper.util.CollisionUtil.COLLISION_FLAG_CHECK_BORDER | this.getExtraCollisionFlags(), // Sakura
                 null, null
         );
 
@@ -4875,7 +4888,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S
 
     @Override
     public boolean isAlwaysTicking() {
-        return false;
+        return this.loadChunks; // Sakura - always tick in chunks
     }
 
     public boolean mayInteract(Level world, BlockPos pos) {
diff --git a/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java b/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
index ec8488a2ab16950052a3bff04be6e3ecc3b44891..1a018e1d2b6dd93be5e6209a2d52eade0b356f58 100644
--- a/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
+++ b/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
@@ -74,6 +74,7 @@ public class FallingBlockEntity extends Entity {
         this.dropItem = true;
         this.fallDamageMax = 40;
         this.isFallingBlock = true; // Sakura
+        this.loadChunks = world.sakuraConfig().cannons.sand.loadsChunks; // Sakura - load chunks
     }
 
     public FallingBlockEntity(Level world, double x, double y, double z, BlockState block) {
diff --git a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
index c187a2714d5580a2d8db54d270999aa618c4c878..0be7c39fbb19a0cdca3f5dc779c2690df5f08647 100644
--- a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
+++ b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
@@ -39,6 +39,7 @@ public class PrimedTnt extends Entity implements TraceableEntity {
         super(type, world);
         this.blocksBuilding = true;
         this.isPrimedTNT = true; // Sakura
+        this.loadChunks = world.sakuraConfig().cannons.tnt.loadsChunks; // Sakura - load chunks
     }
 
     public PrimedTnt(Level world, double x, double y, double z, @Nullable LivingEntity igniter) {