From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samsuik <kfian294ma4@gmail.com>
Date: Fri, 3 May 2024 15:18:58 +0100
Subject: [PATCH] Optimise explosions in protected regions


diff --git a/src/main/java/net/minecraft/world/level/ServerExplosion.java b/src/main/java/net/minecraft/world/level/ServerExplosion.java
index 10432b31acd047ac2aa8581f2ee863254ec8d1eb..b07c2eb8cc3cc54e8ab72c5ed3d6d7623416e7fb 100644
--- a/src/main/java/net/minecraft/world/level/ServerExplosion.java
+++ b/src/main/java/net/minecraft/world/level/ServerExplosion.java
@@ -345,6 +345,22 @@ public class ServerExplosion implements Explosion {
         return rays;
     }
     // Sakura end - optimise paper explosions
+    // Sakura start - optimise explosion protected regions
+    protected final boolean isRegionUnprotected() {
+        // optimisation: We check if a plugin has cancelled the event or cleared the blockList.
+        // It tells us if the result was thrown away, so we can avoid the block searching logic.
+        // As a side effect the event is called twice which may interfere with some plugins.
+        if (this.source != null && this.level.sakuraConfig().cannons.explosion.optimiseProtectedRegions) {
+            Location location = new Location(this.level.getWorld(), this.center.x, this.center.y, this.center.z);
+            List<org.bukkit.block.Block> blocks = new ObjectArrayList<>(1);
+            blocks.add(location.getBlock());
+            EntityExplodeEvent event = CraftEventFactory.callEntityExplodeEvent(this.source, blocks, 0.0f, this.blockInteraction);
+            return !event.isCancelled() && !event.blockList().isEmpty();
+        }
+
+        return true;
+    }
+    // Sakura end - optimise explosion protected regions
 
     public ServerExplosion(ServerLevel world, @Nullable Entity entity, @Nullable DamageSource damageSource, @Nullable ExplosionDamageCalculator behavior, Vec3 pos, float power, boolean createFire, Explosion.BlockInteraction destructionType) {
         this.level = world;
@@ -441,6 +457,11 @@ public class ServerExplosion implements Explosion {
             return ret;
         }
         // Sakura end - optimise paper explosions
+        // Sakura start - optimise protected explosions
+        if (!this.isRegionUnprotected()) {
+            return ret;
+        }
+        // Sakura end - optimise protected explosions
 
         // only ~1/3rd of the loop iterations in vanilla will result in a ray, as it is iterating the perimeter of
         // a 16x16x16 cube