From 6e88b4fa1ec88be3dd08e2050582760929ea6e88 Mon Sep 17 00:00:00 2001
From: TrollyLoki <trollyloki@gmail.com>
Date: Sat, 4 Nov 2023 17:32:10 -0400
Subject: [PATCH] Add API to get the collision shape of a block before it's
 placed (#9821)

* Add API to get the collision shape of a block before it's placed

* Tweak API documentation

* Clarify behavior

* Rebase

* Rebase
---
 ...he-collision-shape-of-a-block-before.patch | 31 ++++++++++++++++++
 ...he-collision-shape-of-a-block-before.patch | 32 +++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 patches/api/Add-API-to-get-the-collision-shape-of-a-block-before.patch
 create mode 100644 patches/server/Add-API-to-get-the-collision-shape-of-a-block-before.patch

diff --git a/patches/api/Add-API-to-get-the-collision-shape-of-a-block-before.patch b/patches/api/Add-API-to-get-the-collision-shape-of-a-block-before.patch
new file mode 100644
index 0000000000..a6ea0ac298
--- /dev/null
+++ b/patches/api/Add-API-to-get-the-collision-shape-of-a-block-before.patch
@@ -0,0 +1,31 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: TrollyLoki <trollyloki@gmail.com>
+Date: Wed, 11 Oct 2023 00:45:54 -0400
+Subject: [PATCH] Add API to get the collision shape of a block before it's
+ placed
+
+
+diff --git a/src/main/java/org/bukkit/block/data/BlockData.java b/src/main/java/org/bukkit/block/data/BlockData.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/block/data/BlockData.java
++++ b/src/main/java/org/bukkit/block/data/BlockData.java
+@@ -0,0 +0,0 @@ public interface BlockData extends Cloneable {
+      */
+     boolean isFaceSturdy(@NotNull BlockFace face, @NotNull BlockSupport support);
+ 
++    // Paper start
++    /**
++     * Calculates the collision shape this block data would have at a particular location.
++     * <p>
++     * This does not take into account any block updates that may occur if the block was to be actually placed in the world.
++     *
++     * @param location the location to calculate the collision shape at
++     *
++     * @return a {@link org.bukkit.util.VoxelShape} representing the collision shape of this block data.
++     */
++    @NotNull org.bukkit.util.VoxelShape getCollisionShape(@NotNull Location location);
++    // Paper end
++
+     /**
+      * Gets the material that a player would use to place this block.
+      * <p>
diff --git a/patches/server/Add-API-to-get-the-collision-shape-of-a-block-before.patch b/patches/server/Add-API-to-get-the-collision-shape-of-a-block-before.patch
new file mode 100644
index 0000000000..99c377b01c
--- /dev/null
+++ b/patches/server/Add-API-to-get-the-collision-shape-of-a-block-before.patch
@@ -0,0 +1,32 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: TrollyLoki <trollyloki@gmail.com>
+Date: Wed, 11 Oct 2023 00:45:53 -0400
+Subject: [PATCH] Add API to get the collision shape of a block before it's
+ placed
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
++++ b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
+@@ -0,0 +0,0 @@ public class CraftBlockData implements BlockData {
+         return this.state.isFaceSturdy(EmptyBlockGetter.INSTANCE, BlockPos.ZERO, CraftBlock.blockFaceToNotch(face), CraftBlockSupport.toNMS(support));
+     }
+ 
++    // Paper start
++    @Override
++    public org.bukkit.util.VoxelShape getCollisionShape(Location location) {
++        Preconditions.checkArgument(location != null, "location must not be null");
++
++        CraftWorld world = (CraftWorld) location.getWorld();
++        Preconditions.checkArgument(world != null, "location must not have a null world");
++
++        BlockPos position = CraftLocation.toBlockPosition(location);
++        net.minecraft.world.phys.shapes.VoxelShape shape = this.state.getCollisionShape(world.getHandle(), position);
++        return new org.bukkit.craftbukkit.util.CraftVoxelShape(shape);
++    }
++    // Paper end
++
+     @Override
+     public Material getPlacementMaterial() {
+         return CraftMagicNumbers.getMaterial(this.state.getBlock().asItem());