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 ead8ddd7fd9941d4349b9b94ad313bf9d46bdc0b..d7e8dd148098de080c5bc0f76b36207501e1089f 100644
--- a/src/main/java/net/minecraft/world/level/Explosion.java
+++ b/src/main/java/net/minecraft/world/level/Explosion.java
@@ -416,6 +416,21 @@ public class Explosion {
         return (float)missedRays / (float)totalRays;
     }
     // Paper end - optimise collisions
+    // Sakura start - optimise protected explosions
+    protected final boolean isRegionUnprotected() {
+        // As an optimisation, check if a plugin has cancelled or cleared the blockList.
+        // This is relatively sane on factions and cannon servers, but mileage may vary.
+        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 = new EntityExplodeEvent(this.source.getBukkitEntity(), location, blocks, 0.0f);
+            return event.callEvent() && !event.blockList().isEmpty();
+        }
+
+        return true;
+    }
+    // Sakura end - optimise protected explosions
 
     private ExplosionDamageCalculator makeDamageCalculator(@Nullable Entity entity) {
         return (ExplosionDamageCalculator) (entity == null ? Explosion.EXPLOSION_DAMAGE_CALCULATOR : new EntityBasedExplosionDamageCalculator(entity));
@@ -507,7 +522,7 @@ public class Explosion {
             initialCache = this.getOrCacheExplosionBlock(blockX, blockY, blockZ, key, true);
         }
         // 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);