Paper/Spigot-Server-Patches/0035-Optimize-explosions.patch

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From 983be83bdbd9f5a39c09dd55eee555a6438dc434 Mon Sep 17 00:00:00 2001
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From: Byteflux <byte@byteflux.net>
2016-03-01 00:09:49 +01:00
Date: Wed, 2 Mar 2016 11:59:48 -0600
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Subject: [PATCH] Optimize explosions
The process of determining an entity's exposure from explosions can be
expensive when there are hundreds or more entities in range.
This patch adds a per-tick cache that is used for storing and retrieving
an entity's exposure during an explosion.
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diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
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index 74d22f7..d022513 100644
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--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -193,4 +193,10 @@ public class PaperWorldConfig {
generateVillage = getBoolean("generator-settings.village", true);
generateFlatBedrock = getBoolean("generator-settings.flat-bedrock", false);
}
+
+ public boolean optimizeExplosions;
+ private void optimizeExplosions() {
+ optimizeExplosions = getBoolean("optimize-explosions", false);
+ log("Optimize explosions: " + optimizeExplosions);
+ }
}
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diff --git a/src/main/java/net/minecraft/server/Explosion.java b/src/main/java/net/minecraft/server/Explosion.java
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index 87e123c..afe402e 100644
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--- a/src/main/java/net/minecraft/server/Explosion.java
+++ b/src/main/java/net/minecraft/server/Explosion.java
@@ -129,7 +129,7 @@ public class Explosion {
d8 /= d11;
d9 /= d11;
d10 /= d11;
- double d12 = (double) this.world.a(vec3d, entity.getBoundingBox());
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+ double d12 = this.getBlockDensity(vec3d, entity.getBoundingBox()); // Paper - Optimize explosions
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double d13 = (1.0D - d7) * d12;
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// CraftBukkit start
@@ -296,4 +296,85 @@ public class Explosion {
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public List<BlockPosition> getBlocks() {
return this.blocks;
}
+
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+ // Paper start - Optimize explosions
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+ private float getBlockDensity(Vec3D vec3d, AxisAlignedBB aabb) {
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+ if (!this.world.paperConfig.optimizeExplosions) {
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+ return this.world.a(vec3d, aabb);
+ }
+ CacheKey key = new CacheKey(this, aabb);
+ Float blockDensity = this.world.explosionDensityCache.get(key);
+ if (blockDensity == null) {
+ blockDensity = this.world.a(vec3d, aabb);
+ this.world.explosionDensityCache.put(key, blockDensity);
+ }
+
+ return blockDensity;
+ }
+
+ static class CacheKey {
+ private final World world;
+ private final double posX, posY, posZ;
+ private final double minX, minY, minZ;
+ private final double maxX, maxY, maxZ;
+
+ public CacheKey(Explosion explosion, AxisAlignedBB aabb) {
+ this.world = explosion.world;
+ this.posX = explosion.posX;
+ this.posY = explosion.posY;
+ this.posZ = explosion.posZ;
+ this.minX = aabb.a;
+ this.minY = aabb.b;
+ this.minZ = aabb.c;
+ this.maxX = aabb.d;
+ this.maxY = aabb.e;
+ this.maxZ = aabb.f;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+
+ CacheKey cacheKey = (CacheKey) o;
+
+ if (Double.compare(cacheKey.posX, posX) != 0) return false;
+ if (Double.compare(cacheKey.posY, posY) != 0) return false;
+ if (Double.compare(cacheKey.posZ, posZ) != 0) return false;
+ if (Double.compare(cacheKey.minX, minX) != 0) return false;
+ if (Double.compare(cacheKey.minY, minY) != 0) return false;
+ if (Double.compare(cacheKey.minZ, minZ) != 0) return false;
+ if (Double.compare(cacheKey.maxX, maxX) != 0) return false;
+ if (Double.compare(cacheKey.maxY, maxY) != 0) return false;
+ if (Double.compare(cacheKey.maxZ, maxZ) != 0) return false;
+ return world.equals(cacheKey.world);
+ }
+
+ @Override
+ public int hashCode() {
+ int result;
+ long temp;
+ result = world.hashCode();
+ temp = Double.doubleToLongBits(posX);
+ result = 31 * result + (int) (temp ^ (temp >>> 32));
+ temp = Double.doubleToLongBits(posY);
+ result = 31 * result + (int) (temp ^ (temp >>> 32));
+ temp = Double.doubleToLongBits(posZ);
+ result = 31 * result + (int) (temp ^ (temp >>> 32));
+ temp = Double.doubleToLongBits(minX);
+ result = 31 * result + (int) (temp ^ (temp >>> 32));
+ temp = Double.doubleToLongBits(minY);
+ result = 31 * result + (int) (temp ^ (temp >>> 32));
+ temp = Double.doubleToLongBits(minZ);
+ result = 31 * result + (int) (temp ^ (temp >>> 32));
+ temp = Double.doubleToLongBits(maxX);
+ result = 31 * result + (int) (temp ^ (temp >>> 32));
+ temp = Double.doubleToLongBits(maxY);
+ result = 31 * result + (int) (temp ^ (temp >>> 32));
+ temp = Double.doubleToLongBits(maxZ);
+ result = 31 * result + (int) (temp ^ (temp >>> 32));
+ return result;
+ }
+ }
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+ // Paper end
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}
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index db425fb..733f8e7 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -863,6 +863,7 @@ public abstract class MinecraftServer implements Runnable, ICommandListener, IAs
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worldserver.timings.tracker.stopTiming(); // Spigot
this.methodProfiler.b();
this.methodProfiler.b();
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+ worldserver.explosionDensityCache.clear(); // Paper - Optimize explosions
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// } // CraftBukkit
// this.i[i][this.ticks % 100] = System.nanoTime() - j; // CraftBukkit
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
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index bbdfb3b..ee4642f 100644
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--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
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@@ -32,6 +32,7 @@ import org.bukkit.generator.ChunkGenerator;
// Paper start
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
+import java.util.HashMap;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
// Paper end
@@ -141,6 +142,7 @@ public abstract class World implements IBlockAccess {
private org.spigotmc.TickLimiter tileLimiter;
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private int tileTickPosition;
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public ExecutorService lightingExecutor = Executors.newSingleThreadExecutor(new ThreadFactoryBuilder().setNameFormat("Paper - Lighting Thread").build()); // Paper - Asynchronous lighting updates
+ public final Map<Explosion.CacheKey, Float> explosionDensityCache = new HashMap<Explosion.CacheKey, Float>(); // Paper - Optimize explosions
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public CraftWorld getWorld() {
return this.world;
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--
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2.7.2
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