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/Explosion.java b/src/main/java/net/minecraft/world/level/Explosion.java
index 3ad6f5f19c9fae2f00c662971eaa613c1a0ddbcf..da423a9211dd72bc531d7f0f65aab08b5c44f39c 100644
--- a/src/main/java/net/minecraft/world/level/Explosion.java
+++ b/src/main/java/net/minecraft/world/level/Explosion.java
@@ -353,6 +353,22 @@ public class 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.x, this.y, this.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 static DamageSource getDefaultDamageSource(Level world, @Nullable Entity source) {
         return world.damageSources().explosion(source, Explosion.getIndirectSourceEntityInternal(source));
@@ -486,7 +502,7 @@ public class Explosion {
 
         // Paper start - collision optimisations
         // Sakura start - optimise paper explosions
-        if (initialCache.resistance <= (this.radius * 1.3f) && this.interactsWithBlocks()) {
+        if (initialCache.resistance <= (this.radius * 1.3f) && this.interactsWithBlocks() && this.isRegionUnprotected()) { // Sakura - optimise protected explosions
             this.searchForBlocks(blockCache, initialCache);
         }
         this.locateAndImpactEntities(blockCache);