From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sun, 10 May 2020 22:49:05 -0400
Subject: [PATCH] Optimize WorldBorder collision checks and air


diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index c81b9d814d50a026872d2711f76649c00d65888b..e0ab058bf947ea10b37eadf6122292e708bd3809 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -845,7 +845,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
         AxisAlignedBB axisalignedbb = this.getBoundingBox();
         VoxelShapeCollision voxelshapecollision = VoxelShapeCollision.a(this);
         VoxelShape voxelshape = this.world.getWorldBorder().a();
-        Stream<VoxelShape> stream = VoxelShapes.c(voxelshape, VoxelShapes.a(axisalignedbb.shrink(1.0E-7D)), OperatorBoolean.AND) ? Stream.empty() : Stream.of(voxelshape);
+        Stream<VoxelShape> stream = !this.world.getWorldBorder().isInBounds(axisalignedbb) ? Stream.empty() : Stream.of(this.world.getWorldBorder().a()); // Paper
         Stream<VoxelShape> stream1 = this.world.b(this, axisalignedbb.a(vec3d), (Set) ImmutableSet.of());
         StreamAccumulator<VoxelShape> streamaccumulator = new StreamAccumulator<>(Stream.concat(stream1, stream));
         Vec3D vec3d1 = vec3d.g() == 0.0D ? vec3d : a(this, vec3d, axisalignedbb, this.world, voxelshapecollision, streamaccumulator);
diff --git a/src/main/java/net/minecraft/server/ICollisionAccess.java b/src/main/java/net/minecraft/server/ICollisionAccess.java
index 0295e563aa027be5ca1a7eb78727aacf18729025..dae8dd67bb7a94132ff421eff40fed73aa649c67 100644
--- a/src/main/java/net/minecraft/server/ICollisionAccess.java
+++ b/src/main/java/net/minecraft/server/ICollisionAccess.java
@@ -98,12 +98,12 @@ public interface ICollisionAccess extends IBlockAccess {
             if (true) { //public boolean tryAdvance(Consumer<? super VoxelShape> consumer) {*/ // Paper
                 if (entity != null) {
                     // Paper end
-                    VoxelShape voxelshape1 = ICollisionAccess.this.getWorldBorder().a();
-                    boolean flag = VoxelShapes.c(voxelshape1, VoxelShapes.a(entity.getBoundingBox().shrink(1.0E-7D)), OperatorBoolean.AND);
-                    boolean flag1 = VoxelShapes.c(voxelshape1, VoxelShapes.a(entity.getBoundingBox().g(1.0E-7D)), OperatorBoolean.AND);
+                    //VoxelShape voxelshape1 = ICollisionAccess.this.getWorldBorder().a(); // Paper - only make if collides
+                    boolean flag = !ICollisionAccess.this.getWorldBorder().isInBounds(entity.getBoundingBox().shrink(1.0E-7D)); // Paper
+                    boolean flag1 = !ICollisionAccess.this.getWorldBorder().isInBounds(entity.getBoundingBox().g(1.0E-7D)); // Paper
 
                     if (!flag && flag1) {
-                        collisions.add(voxelshape1);// Paper
+                        collisions.add(ICollisionAccess.this.getWorldBorder().a());// Paper
                         if (returnFast) return collisions;
                     }
                 }
@@ -136,7 +136,7 @@ public interface ICollisionAccess extends IBlockAccess {
                             //IBlockData iblockdata = iblockaccess.getType(blockposition_mutableblockposition); // moved up
                             // Paper end
 
-                            if ((j2 != 1 || iblockdata.f()) && (j2 != 2 || iblockdata.getBlock() == Blocks.MOVING_PISTON)) {
+                            if (!iblockdata.isAir() && (j2 != 1 || iblockdata.f()) && (j2 != 2 || iblockdata.getBlock() == Blocks.MOVING_PISTON)) { // Paper - fast track air
                                 VoxelShape voxelshape2 = iblockdata.b((IBlockAccess) ICollisionAccess.this, blockposition_mutableblockposition, voxelshapecollision);
 
                                 // Paper start - Lithium Collision Optimizations
diff --git a/src/main/java/net/minecraft/server/WorldBorder.java b/src/main/java/net/minecraft/server/WorldBorder.java
index 4c20db5a3f9e159997a9851691aca421241d6d95..535d08ffb1d20570b19307c8619cfd39b4541356 100644
--- a/src/main/java/net/minecraft/server/WorldBorder.java
+++ b/src/main/java/net/minecraft/server/WorldBorder.java
@@ -40,6 +40,7 @@ public class WorldBorder {
         return (double) chunkcoordintpair.f() > this.c() && (double) chunkcoordintpair.d() < this.e() && (double) chunkcoordintpair.g() > this.d() && (double) chunkcoordintpair.e() < this.f();
     }
 
+    public final boolean isInBounds(AxisAlignedBB aabb) { return this.a(aabb); } // Paper - OBFHELPER
     public boolean a(AxisAlignedBB axisalignedbb) {
         return axisalignedbb.maxX > this.c() && axisalignedbb.minX < this.e() && axisalignedbb.maxZ > this.d() && axisalignedbb.minZ < this.f();
     }