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 8ef317a79db184db69b2a699c280b5c7c2663259..cf9dd1ffdacdfe1c26ca15ca17a20fe46a81b20d 100644
--- a/src/main/java/net/minecraft/world/level/Explosion.java
+++ b/src/main/java/net/minecraft/world/level/Explosion.java
@@ -289,6 +289,22 @@ public class Explosion {
         }
     }
 
+    // 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.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) {
         if (entity instanceof net.minecraft.world.entity.item.PrimedTnt) {
             return EXPLOSION_DAMAGE_CALCULATOR;
@@ -358,7 +374,7 @@ public class Explosion {
         BlockPos explosionBlockPos = new BlockPos(this.x, this.y, this.z);
         BlockState blockstate = this.level.getBlockState(explosionBlockPos);
         float resistance = blockstate.getBlock().getExplosionResistance();
-        if ((resistance + 0.3f) * 0.3f < (this.radius * 1.3f) && this.blockInteraction != Explosion.BlockInteraction.NONE) {
+        if ((resistance + 0.3f) * 0.3f < (this.radius * 1.3f) && this.blockInteraction != Explosion.BlockInteraction.NONE && this.isRegionUnprotected()) { // Sakura - optimise protected explosions
             this.searchForBlocks();
         }