From 307778fc7003e487b1b4a107470eb96890fb4593 Mon Sep 17 00:00:00 2001
From: Owen <23108066+Owen1212055@users.noreply.github.com>
Date: Sun, 31 Jul 2022 11:30:34 -0400
Subject: [PATCH] Collision API (#6736)

---
 patches/api/0390-Collision-API.patch    | 57 +++++++++++++++++++++++++
 patches/server/0929-Collision-API.patch | 47 ++++++++++++++++++++
 2 files changed, 104 insertions(+)
 create mode 100644 patches/api/0390-Collision-API.patch
 create mode 100644 patches/server/0929-Collision-API.patch

diff --git a/patches/api/0390-Collision-API.patch b/patches/api/0390-Collision-API.patch
new file mode 100644
index 0000000000..8ab9ca750f
--- /dev/null
+++ b/patches/api/0390-Collision-API.patch
@@ -0,0 +1,57 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
+Date: Wed, 6 Oct 2021 20:10:36 -0400
+Subject: [PATCH] Collision API
+
+
+diff --git a/src/main/java/org/bukkit/RegionAccessor.java b/src/main/java/org/bukkit/RegionAccessor.java
+index 3f7e860de4e28745fcdf8d2f41f4a8c210f48909..39fa4c65e0f61450901662ff5c08d54a5d9841b2 100644
+--- a/src/main/java/org/bukkit/RegionAccessor.java
++++ b/src/main/java/org/bukkit/RegionAccessor.java
+@@ -424,5 +424,15 @@ public interface RegionAccessor extends Keyed { // Paper
+      * @return whether a line of sight exists between {@code from} and {@code to}
+      */
+     public boolean lineOfSightExists(@NotNull Location from, @NotNull Location to);
++
++    /**
++     * Checks if the world collides with the given boundingbox.
++     * This will check for any colliding hard entities (boats, shulkers) / worldborder / blocks.
++     * Does not load chunks that are within the bounding box.
++     *
++     * @param boundingBox the box to check collisions in
++     * @return collides or not
++     */
++    boolean hasCollisionsIn(@NotNull org.bukkit.util.BoundingBox boundingBox);
+     // Paper end
+ }
+diff --git a/src/main/java/org/bukkit/entity/Entity.java b/src/main/java/org/bukkit/entity/Entity.java
+index 03b35d3ba8ba00c0fa0272450f19355244a014ea..4d4a0d15876cc48c9c0456b9f11a5dda37fd56ce 100644
+--- a/src/main/java/org/bukkit/entity/Entity.java
++++ b/src/main/java/org/bukkit/entity/Entity.java
+@@ -897,4 +897,26 @@ public interface Entity extends Metadatable, CommandSender, Nameable, Persistent
+      */
+     boolean isInPowderedSnow();
+     // Paper end
++
++    // Paper Start - Collision API
++    /**
++     * Checks for any collisions with the entity's bounding box at the provided location.
++     * This will check for any colliding entities (boats, shulkers) / worldborder / blocks.
++     * Does not load chunks that are within the bounding box at the specified location.
++     *
++     * @param location the location to check collisions in
++     * @return collides or not
++     */
++    boolean collidesAt(@NotNull Location location);
++
++    /**
++     * This checks using the given boundingbox as the entity's boundingbox if the entity would collide with anything.
++     * This will check for any colliding entities (boats, shulkers) / worldborder / blocks.
++     * Does not load chunks that are within the bounding box.
++     *
++     * @param boundingBox the box to check collisions in
++     * @return collides or not
++     */
++    boolean wouldCollideUsing(@NotNull BoundingBox boundingBox);
++    // Paper End - Collision API
+ }
diff --git a/patches/server/0929-Collision-API.patch b/patches/server/0929-Collision-API.patch
new file mode 100644
index 0000000000..510fa23e1a
--- /dev/null
+++ b/patches/server/0929-Collision-API.patch
@@ -0,0 +1,47 @@
+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
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
+index 6445c2e4c97860e1c98f5263188d309cf55936f0..62bca85da6c5d9877e21fecb702370506ddf671c 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
+@@ -962,5 +962,12 @@ public abstract class CraftRegionAccessor implements RegionAccessor {
+ 
+         return this.getHandle().clip(new net.minecraft.world.level.ClipContext(vec3d, vec3d1, net.minecraft.world.level.ClipContext.Block.COLLIDER, net.minecraft.world.level.ClipContext.Fluid.NONE, null)).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 AABB(boundingBox.getMinX(), boundingBox.getMinY(), boundingBox.getMinZ(), boundingBox.getMaxX(), boundingBox.getMaxY(), boundingBox.getMaxZ(), false);
++
++        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 b80cc0938b2b3928f4450f1314a9fbd7ea9c116b..6549ade8e19807c523e5a1dc68b66585aad438b1 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+@@ -1340,4 +1340,19 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
+         return getHandle().isInPowderSnow || getHandle().wasInPowderSnow; // depending on the location in the entity "tick" either could be needed.
+     }
+     // Paper end
++    // 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(), false);
++
++        return !this.getHandle().level.noCollision(this.getHandle(), aabb);
++    }
++    // Paper End - Collision API
+ }