Paper/patches/server/0749-Collision-API.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Wed, 6 Oct 2021 20:10:44 -0400
Subject: [PATCH] Collision API

Co-authored-by: Tamion <70228790+notTamion@users.noreply.github.com>

diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 4b54b3e121508fb1590654123e86c6c5de54a755..f8125c2319013241b48b818977fb1dc5d9050905 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -1907,6 +1907,7 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
         if (!this.isPassengerOfSameVehicle(entity)) {
             if (!entity.noPhysics && !this.noPhysics) {
                 if (this.level.paperConfig().collisions.onlyPlayersCollide && !(entity instanceof ServerPlayer || this instanceof ServerPlayer)) return; // Paper - Collision option for requiring a player participant
+                if (!new io.papermc.paper.event.entity.EntityCollideWithEntityEvent(this.getBukkitEntity(), entity.getBukkitEntity()).callEvent()) return; // Paper
                 double d0 = entity.getX() - this.getX();
                 double d1 = entity.getZ() - this.getZ();
                 double d2 = Mth.absMax(d0, d1);
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
index d1c265733941874002f6dfc7543917af88600659..72c275d7da798ee10a224bbd3f4c92abd82601e1 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
@@ -539,5 +539,12 @@ public abstract class CraftRegionAccessor implements RegionAccessor {
 
         return this.getHandle().clip(new net.minecraft.world.level.ClipContext(start, end, net.minecraft.world.level.ClipContext.Block.COLLIDER, net.minecraft.world.level.ClipContext.Fluid.NONE, net.minecraft.world.phys.shapes.CollisionContext.empty())).getType() == net.minecraft.world.phys.HitResult.Type.MISS;
     }
+
+    @Override
+    public boolean hasCollisionsIn(@org.jetbrains.annotations.NotNull org.bukkit.util.BoundingBox boundingBox) {
+        net.minecraft.world.phys.AABB aabb = new net.minecraft.world.phys.AABB(boundingBox.getMinX(), boundingBox.getMinY(), boundingBox.getMinZ(), boundingBox.getMaxX(), boundingBox.getMaxY(), boundingBox.getMaxZ());
+
+        return !this.getHandle().noCollision(aabb);
+    }
     // Paper end
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
index b6fef2ca5b564c293cb602cb8e300d35dba89b1f..92c80776273f6be43b40686c7ab7dd7371b1c06f 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
@@ -1174,4 +1174,20 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
         return this.getHandle().noPhysics;
     }
     // Paper end - missing entity api
+
+    // Paper start - Collision API
+    @Override
+    public boolean collidesAt(@org.jetbrains.annotations.NotNull Location location) {
+        net.minecraft.world.phys.AABB aabb = this.getHandle().getBoundingBoxAt(location.getX(), location.getY(), location.getZ());
+
+        return !this.getHandle().level().noCollision(this.getHandle(), aabb);
+    }
+
+    @Override
+    public boolean wouldCollideUsing(@org.jetbrains.annotations.NotNull BoundingBox boundingBox) {
+        net.minecraft.world.phys.AABB aabb = new AABB(boundingBox.getMinX(), boundingBox.getMinY(), boundingBox.getMinZ(), boundingBox.getMaxX(), boundingBox.getMaxY(), boundingBox.getMaxZ());
+
+        return !this.getHandle().level().noCollision(this.getHandle(), aabb);
+    }
+    // Paper end - Collision API
 }