From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: DoctaEnkoda <bierquejason@gmail.com>
Date: Tue, 11 May 2021 00:28:13 +0200
Subject: [PATCH] Optimize collisions


diff --git a/src/main/java/net/minecraft/server/level/WorldServer.java b/src/main/java/net/minecraft/server/level/WorldServer.java
index 7e943d9ba04abd964850d9b0109c5c6c9a1e5611..0ec132efc49880d9b230e176bce79732b7231765 100644
--- a/src/main/java/net/minecraft/server/level/WorldServer.java
+++ b/src/main/java/net/minecraft/server/level/WorldServer.java
@@ -678,16 +678,10 @@ public class WorldServer extends World implements GeneratorAccessSeed {
             }
         }
 
-        int minBlockX = MathHelper.floor(axisalignedbb.minX - MCUtil.COLLISION_EPSILON) - 1;
-        int maxBlockX = MathHelper.floor(axisalignedbb.maxX + MCUtil.COLLISION_EPSILON) + 1;
-
+        // Purpur Start Rebase - Calculate when needed only
         int minBlockY = MathHelper.floor(axisalignedbb.minY - MCUtil.COLLISION_EPSILON) - 1;
         int maxBlockY = MathHelper.floor(axisalignedbb.maxY + MCUtil.COLLISION_EPSILON) + 1;
 
-        int minBlockZ = MathHelper.floor(axisalignedbb.minZ - MCUtil.COLLISION_EPSILON) - 1;
-        int maxBlockZ = MathHelper.floor(axisalignedbb.maxZ + MCUtil.COLLISION_EPSILON) + 1;
-
-
         BlockPosition.MutableBlockPosition mutablePos = new BlockPosition.MutableBlockPosition();
         net.minecraft.world.phys.shapes.VoxelShapeCollision collisionShape = null;
 
@@ -697,6 +691,13 @@ public class WorldServer extends World implements GeneratorAccessSeed {
             return ret;
         }
 
+        int minBlockX = MathHelper.floor(axisalignedbb.minX - MCUtil.COLLISION_EPSILON) - 1;
+        int maxBlockX = MathHelper.floor(axisalignedbb.maxX + MCUtil.COLLISION_EPSILON) + 1;
+
+        int minBlockZ = MathHelper.floor(axisalignedbb.minZ - MCUtil.COLLISION_EPSILON) - 1;
+        int maxBlockZ = MathHelper.floor(axisalignedbb.maxZ + MCUtil.COLLISION_EPSILON) + 1;
+        // Purpur End
+
         int minYIterate = Math.max(0, minBlockY);
         int maxYIterate = Math.min(255, maxBlockY);
 
diff --git a/src/main/java/net/minecraft/world/level/ChunkCache.java b/src/main/java/net/minecraft/world/level/ChunkCache.java
index b547eb352f90f68cf36ffb82e43ad7acb1892f6a..456ef170f8885ad42c3c2bd2a54c5bc46bfe30cd 100644
--- a/src/main/java/net/minecraft/world/level/ChunkCache.java
+++ b/src/main/java/net/minecraft/world/level/ChunkCache.java
@@ -60,16 +60,10 @@ public class ChunkCache implements IBlockAccess, ICollisionAccess {
             }
         }
 
-        int minBlockX = net.minecraft.util.MathHelper.floor(axisalignedbb.minX - net.minecraft.server.MCUtil.COLLISION_EPSILON) - 1;
-        int maxBlockX = net.minecraft.util.MathHelper.floor(axisalignedbb.maxX + net.minecraft.server.MCUtil.COLLISION_EPSILON) + 1;
-
+        // Purpur Rebase - Calculate when needed only
         int minBlockY = net.minecraft.util.MathHelper.floor(axisalignedbb.minY - net.minecraft.server.MCUtil.COLLISION_EPSILON) - 1;
         int maxBlockY = net.minecraft.util.MathHelper.floor(axisalignedbb.maxY + net.minecraft.server.MCUtil.COLLISION_EPSILON) + 1;
-
-        int minBlockZ = net.minecraft.util.MathHelper.floor(axisalignedbb.minZ - net.minecraft.server.MCUtil.COLLISION_EPSILON) - 1;
-        int maxBlockZ = net.minecraft.util.MathHelper.floor(axisalignedbb.maxZ + net.minecraft.server.MCUtil.COLLISION_EPSILON) + 1;
-
-
+        
         BlockPosition.MutableBlockPosition mutablePos = new BlockPosition.MutableBlockPosition();
         net.minecraft.world.phys.shapes.VoxelShapeCollision collisionShape = null;
 
@@ -79,6 +73,13 @@ public class ChunkCache implements IBlockAccess, ICollisionAccess {
             return ret;
         }
 
+        int minBlockX = net.minecraft.util.MathHelper.floor(axisalignedbb.minX - net.minecraft.server.MCUtil.COLLISION_EPSILON) - 1;
+        int maxBlockX = net.minecraft.util.MathHelper.floor(axisalignedbb.maxX + net.minecraft.server.MCUtil.COLLISION_EPSILON) + 1;
+
+        int minBlockZ = net.minecraft.util.MathHelper.floor(axisalignedbb.minZ - net.minecraft.server.MCUtil.COLLISION_EPSILON) - 1;
+        int maxBlockZ = net.minecraft.util.MathHelper.floor(axisalignedbb.maxZ + net.minecraft.server.MCUtil.COLLISION_EPSILON) + 1;
+        // Purpur End
+
         int minYIterate = Math.max(0, minBlockY);
         int maxYIterate = Math.min(255, maxBlockY);