From cd02f1e4be16deba003c8629326d53ce8919ae0b Mon Sep 17 00:00:00 2001
From: "Dylan K. Taylor" <odigiman@gmail.com>
Date: Fri, 30 Jun 2017 17:31:41 +0100
Subject: [PATCH] Minor performance improvement to explosions This improves
 calculation time by 20-25% per explosion on flat terrain.

---
 src/pocketmine/block/Block.php     |  4 ++++
 src/pocketmine/level/Explosion.php | 14 +++++++++-----
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/src/pocketmine/block/Block.php b/src/pocketmine/block/Block.php
index 197b3a29c0..3fcf7824a3 100644
--- a/src/pocketmine/block/Block.php
+++ b/src/pocketmine/block/Block.php
@@ -58,6 +58,8 @@ class Block extends Position implements BlockIds, Metadatable{
 	public static $transparent = null;
 	/** @var \SplFixedArray<bool> */
 	public static $diffusesSkyLight = null;
+	/** @var \SplFixedArray */
+	public static $blastResistance = null;
 
 	/**
 	 * Initializes the block factory. By default this is called only once on server start, however you may wish to use
@@ -75,6 +77,7 @@ class Block extends Position implements BlockIds, Metadatable{
 			self::$hardness = new \SplFixedArray(256);
 			self::$transparent = new \SplFixedArray(256);
 			self::$diffusesSkyLight = new \SplFixedArray(256);
+			self::$blastResistance = new \SplFixedArray(256);
 
 			self::registerBlock(new Air());
 			self::registerBlock(new Stone());
@@ -366,6 +369,7 @@ class Block extends Position implements BlockIds, Metadatable{
 		self::$light[$id] = $block->getLightLevel();
 		self::$lightFilter[$id] = $block->getLightFilter() + 1; //opacity plus 1 standard light filter
 		self::$diffusesSkyLight[$id] = $block->diffusesSkyLight();
+		self::$blastResistance[$id] = $block->getBlastResistance();
 	}
 
 	/**
diff --git a/src/pocketmine/level/Explosion.php b/src/pocketmine/level/Explosion.php
index 85099ea414..c822fee9ca 100644
--- a/src/pocketmine/level/Explosion.php
+++ b/src/pocketmine/level/Explosion.php
@@ -89,23 +89,27 @@ class Explosion{
 							$vBlock->x = $pointerX >= $x ? $x : $x - 1;
 							$vBlock->y = $pointerY >= $y ? $y : $y - 1;
 							$vBlock->z = $pointerZ >= $z ? $z : $z - 1;
+
 							if(!$this->level->isInWorld($vBlock->x, $vBlock->y, $vBlock->z)){
 								break;
 							}
-							$block = $this->level->getBlock($vBlock);
 
-							if($block->getId() !== 0){
-								$blastForce -= ($block->getBlastResistance() / 5 + 0.3) * $this->stepLen;
+							$blockId = $this->level->getBlockIdAt($vBlock->x, $vBlock->y, $vBlock->z);
+
+							if($blockId !== 0){
+								$blastForce -= (Block::$blastResistance[$blockId] / 5 + 0.3) * $this->stepLen;
 								if($blastForce > 0){
-									if(!isset($this->affectedBlocks[$index = Level::blockHash($block->x, $block->y, $block->z)])){
-										$this->affectedBlocks[$index] = $block;
+									if(!isset($this->affectedBlocks[$index = Level::blockHash($vBlock->x, $vBlock->y, $vBlock->z)])){
+										$this->affectedBlocks[$index] = $this->level->getBlock($vBlock);
 									}
 								}
 							}
+
 							$pointerX += $vector->x;
 							$pointerY += $vector->y;
 							$pointerZ += $vector->z;
 						}
+
 					}
 				}
 			}