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Optimize Collision Chunk lookup and avoid loading far chunks

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Try to use a faster chunk lookup for collision detection, and only
fall back to the original for nearby chunks.

The collision code takes an AABB and generates a cuboid of checks rather
than a cylinder, so at high velocity this can generate a lot of chunk checks.
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Aikar 2020-04-02 02:42:24 -04:00
parent d5c6dbee56
commit 1dc7c308aa
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From 7e9f51ff89183c8c78b1136528ca5e760e70aa1f Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 2 Apr 2020 02:37:57 -0400
Subject: [PATCH] Optimize Collision Chunk lookup and avoid loading far chunks
Try to use a faster chunk lookup for collision detection, and only
fall back to the original for nearby chunks.
The collision code takes an AABB and generates a cuboid of checks rather
than a cylinder, so at high velocity this can generate a lot of chunk checks.
diff --git a/src/main/java/net/minecraft/server/ICollisionAccess.java b/src/main/java/net/minecraft/server/ICollisionAccess.java
index f851ed11df..d154487294 100644
--- a/src/main/java/net/minecraft/server/ICollisionAccess.java
+++ b/src/main/java/net/minecraft/server/ICollisionAccess.java
@@ -83,15 +83,19 @@ public interface ICollisionAccess extends IBlockAccess {
}
while (cursorposition.a()) {
- int k1 = cursorposition.b();
- int l1 = cursorposition.c();
- int i2 = cursorposition.d();
+ int k1 = cursorposition.b();int x = k1; // Paper
+ int l1 = cursorposition.c();int y = l1; // Paper
+ int i2 = cursorposition.d();int z = i2; // Paper
int j2 = cursorposition.e();
if (j2 != 3) {
int k2 = k1 >> 4;
int l2 = i2 >> 4;
- IBlockAccess iblockaccess = ICollisionAccess.this.c(k2, l2);
+ // Paper start - ensure we don't load chunks for far away chunks
+ boolean far = entity != null && MCUtil.distance(entity.locX(), entity.locY(), entity.locZ(), x, y, z) > 32;
+ IBlockAccess iblockaccess = ICollisionAccess.this instanceof WorldServer ? ((WorldServer) ICollisionAccess.this).getChunkProvider().getChunkAtIfLoadedMainThread(k2, l2) : null;
+ if (!far && iblockaccess == null) iblockaccess = ICollisionAccess.this.c(k2, l2);
+ // Paper end
if (iblockaccess != null) {
blockposition_mutableblockposition.d(k1, l1, i2);
--
2.25.1