From c3eaa827e323c4181089a8087e883f118c1c7fa4 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Sun, 31 Jul 2022 11:30:34 -0400
Subject: [PATCH] Collision API (#6736)

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

diff --git a/patches/api/Collision-API.patch b/patches/api/Collision-API.patch
new file mode 100644
index 0000000000..f4133df27f
--- /dev/null
+++ b/patches/api/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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/RegionAccessor.java
++++ b/src/main/java/org/bukkit/RegionAccessor.java
+@@ -0,0 +0,0 @@ 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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/entity/Entity.java
++++ b/src/main/java/org/bukkit/entity/Entity.java
+@@ -0,0 +0,0 @@ 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/Collision-API.patch b/patches/server/Collision-API.patch
new file mode 100644
index 0000000000..d1ed5db60e
--- /dev/null
+++ b/patches/server/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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
+@@ -0,0 +0,0 @@ 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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+@@ -0,0 +0,0 @@ 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
+ }