From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sat, 1 Dec 2018 19:00:36 -0800
Subject: [PATCH] Add Heightmap API

Changed to use upstream's heightmap API - Machine_Maker

diff --git a/src/main/java/com/destroystokyo/paper/HeightmapType.java b/src/main/java/com/destroystokyo/paper/HeightmapType.java
new file mode 100644
index 0000000000000000000000000000000000000000..1c832d69bb3717dcfccf21e45f6f060a64eb4f11
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/HeightmapType.java
@@ -0,0 +1,39 @@
+package com.destroystokyo.paper;
+
+import org.jetbrains.annotations.ApiStatus;
+
+/**
+ * Enumeration of different heightmap types maintained by the server. Generally using these maps is much faster
+ * than using an iterative search for a block in a given x, z coordinate.
+ *
+ * @deprecated Upstream has added their own API for using the game heightmaps. See {@link org.bukkit.HeightMap} and the
+ * non-deprecated getHighestBlock methods on World such as {@link org.bukkit.World#getHighestBlockAt(org.bukkit.Location, org.bukkit.HeightMap)}.
+ */
+@Deprecated(forRemoval = true) @ApiStatus.ScheduledForRemoval(inVersion = "1.21")
+public enum HeightmapType {
+
+    /**
+     * The highest block used for lighting in the world. Also the block returned by {@link org.bukkit.World#getHighestBlockYAt(int, int)}}
+     */
+    LIGHT_BLOCKING,
+
+    /**
+     * References the highest block in the world.
+     */
+    ANY,
+
+    /**
+     * References the highest solid block in a world.
+     */
+    SOLID,
+
+    /**
+     * References the highest solid or liquid block in a world.
+     */
+    SOLID_OR_LIQUID,
+
+    /**
+     * References the highest solid or liquid block in a world, excluding leaves.
+     */
+    SOLID_OR_LIQUID_NO_LEAVES;
+}
diff --git a/src/main/java/org/bukkit/Location.java b/src/main/java/org/bukkit/Location.java
index 2b9a117804a8ca54b47e51e23359bd6e01087641..1a60a18e15780128a1914826daa952ffacb92e9e 100644
--- a/src/main/java/org/bukkit/Location.java
+++ b/src/main/java/org/bukkit/Location.java
@@ -640,6 +640,47 @@ public class Location implements Cloneable, ConfigurationSerializable, io.paperm
         return centerLoc;
     }
 
+    // Paper start - Add heightmap api
+
+    /**
+     * Returns a copy of this location except with y = getWorld().getHighestBlockYAt(this.getBlockX(), this.getBlockZ())
+     * @return A copy of this location except with y = getWorld().getHighestBlockYAt(this.getBlockX(), this.getBlockZ())
+     * @throws NullPointerException if {{@link #getWorld()}} is {@code null}
+     */
+    @NotNull
+    public Location toHighestLocation() {
+        return this.toHighestLocation(HeightMap.WORLD_SURFACE);
+    }
+
+    /**
+     * Returns a copy of this location except with y = getWorld().getHighestBlockYAt(this.getBlockX(), this.getBlockZ(), heightmap)
+     * @param heightmap The heightmap to use for finding the highest y location.
+     * @return A copy of this location except with y = getWorld().getHighestBlockYAt(this.getBlockX(), this.getBlockZ(), heightmap)
+     * @throws NullPointerException if {{@link #getWorld()}} is {@code null}
+     * @throws UnsupportedOperationException if {@link World#getHighestBlockYAt(int, int, com.destroystokyo.paper.HeightmapType)} does not support the specified heightmap
+     * @deprecated Use {@link org.bukkit.Location#toHighestLocation(HeightMap)}
+     */
+    @NotNull
+    @Deprecated(forRemoval = true) @org.jetbrains.annotations.ApiStatus.ScheduledForRemoval(inVersion = "1.21")
+    public Location toHighestLocation(@NotNull final com.destroystokyo.paper.HeightmapType heightmap) {
+        final Location ret = this.clone();
+        ret.setY(this.getWorld().getHighestBlockYAt(this, heightmap));
+        return ret;
+    }
+
+    /**
+     * Returns a copy of this location except with y = getWorld().getHighestBlockYAt(this.getBlockX(), this.getBlockZ(), heightMap)
+     * @param heightMap The heightmap to use for finding the highest y location.
+     * @return A copy of this location except with y = getWorld().getHighestBlockYAt(this.getBlockX(), this.getBlockZ(), heightMap)
+     */
+    @NotNull
+    public Location toHighestLocation(@NotNull final HeightMap heightMap) {
+        final Location ret = this.clone();
+        ret.setY(this.getWorld().getHighestBlockYAt(this, heightMap));
+        return ret;
+    }
+    // Paper end
+
     /**
      * Creates explosion at this location with given power
      *
diff --git a/src/main/java/org/bukkit/World.java b/src/main/java/org/bukkit/World.java
index 31fc272b0e82e4eef6d9bf01dd25d39513d354b3..0c5ce79c04e8193db248a221f519d80a944ef6ba 100644
--- a/src/main/java/org/bukkit/World.java
+++ b/src/main/java/org/bukkit/World.java
@@ -150,6 +150,87 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
     @NotNull
     public Block getHighestBlockAt(@NotNull Location location);
 
+    // Paper start - Add heightmap API
+    /**
+     * Returns the highest block's y-coordinate at the specified block coordinates that match the specified heightmap's conditions.
+     * <p>
+     * <b>implNote:</b> Implementations are recommended to use an iterative search as a fallback before resorting to
+     * throwing an {@code UnsupportedOperationException}.
+     * </p>
+     *
+     * @param x The block's x-coordinate.
+     * @param z The block's z-coordinate.
+     * @param heightmap The specified heightmap to use. See {@link com.destroystokyo.paper.HeightmapType}
+     * @return The highest block's y-coordinate at (x, z) that matches the specified heightmap's conditions.
+     * @throws UnsupportedOperationException If the heightmap type is not supported.
+     * @deprecated Upstream has added support for this, use {@link World#getHighestBlockYAt(int, int, HeightMap)}
+     *
+     * @see com.destroystokyo.paper.HeightmapType
+     */
+    @Deprecated(forRemoval = true) @org.jetbrains.annotations.ApiStatus.ScheduledForRemoval(inVersion = "1.21")
+    public int getHighestBlockYAt(int x, int z, @NotNull com.destroystokyo.paper.HeightmapType heightmap) throws UnsupportedOperationException;
+
+    /**
+     * Returns the highest block's y-coordinate at the specified block coordinates that match the specified heightmap's conditions.
+     * Note that the y-coordinate of the specified location is ignored.
+     * <p>
+     * <b>implNote:</b> Implementations are recommended to use an iterative search as a fallback before resorting to
+     * throwing an {@code UnsupportedOperationException}.
+     * </p>
+     *
+     * @param location The specified block coordinates.
+     * @param heightmap The specified heightmap to use. See {@link com.destroystokyo.paper.HeightmapType}
+     * @return The highest block's y-coordinate at {@code location} that matches the specified heightmap's conditions.
+     * @throws UnsupportedOperationException If the heightmap type is not supported.
+     * @deprecated Upstream has added support for this, use {@link World#getHighestBlockYAt(Location, HeightMap)}
+     * @see com.destroystokyo.paper.HeightmapType
+     */
+    @Deprecated(forRemoval = true) @org.jetbrains.annotations.ApiStatus.ScheduledForRemoval(inVersion = "1.21")
+    default int getHighestBlockYAt(@NotNull Location location, @NotNull com.destroystokyo.paper.HeightmapType heightmap) throws UnsupportedOperationException {
+        return this.getHighestBlockYAt(location.getBlockX(), location.getBlockZ(), heightmap);
+    }
+
+    /**
+     * Returns the highest {@link Block} at the specified block coordinates that match the specified heightmap's conditions.
+     * <p>
+     * <b>implNote:</b> Implementations are recommended to use an iterative search as a fallback before resorting to
+     * throwing an {@code UnsupportedOperationException}.
+     * </p>
+     * @param x The block's x-coordinate.
+     * @param z The block's z-coordinate.
+     * @param heightmap The specified heightmap to use. See {@link com.destroystokyo.paper.HeightmapType}
+     * @return The highest {@link Block} at (x, z) that matches the specified heightmap's conditions.
+     * @throws UnsupportedOperationException If the heightmap type is not supported.
+     * @deprecated Upstream has added support for this, use {@link World#getHighestBlockAt(int, int, HeightMap)}
+     * @see com.destroystokyo.paper.HeightmapType
+     */
+    @Deprecated(forRemoval = true) @org.jetbrains.annotations.ApiStatus.ScheduledForRemoval(inVersion = "1.21")
+    @NotNull
+    default Block getHighestBlockAt(int x, int z, @NotNull com.destroystokyo.paper.HeightmapType heightmap) throws UnsupportedOperationException {
+        return this.getBlockAt(x, this.getHighestBlockYAt(x, z, heightmap), z);
+    }
+
+    /**
+     * Returns the highest {@link Block} at the specified block coordinates that match the specified heightmap's conditions.
+     * Note that the y-coordinate of the specified location is ignored.
+     * <p>
+     * <b>implNote:</b> Implementations are recommended to use an iterative search as a fallback before resorting to
+     * throwing an {@code UnsupportedOperationException}.
+     * </p>
+     * @param location The specified block coordinates.
+     * @param heightmap The specified heightmap to use. See {@link com.destroystokyo.paper.HeightmapType}
+     * @return The highest {@link Block} at {@code location} that matches the specified heightmap's conditions.
+     * @throws UnsupportedOperationException If the heightmap type is not supported.
+     * @deprecated Upstream has added support for this, use {@link World#getHighestBlockAt(Location, HeightMap)}
+     * @see com.destroystokyo.paper.HeightmapType
+     */
+    @Deprecated(forRemoval = true) @org.jetbrains.annotations.ApiStatus.ScheduledForRemoval(inVersion = "1.21")
+    @NotNull
+    default Block getHighestBlockAt(@NotNull Location location, @NotNull com.destroystokyo.paper.HeightmapType heightmap) throws UnsupportedOperationException {
+        return this.getHighestBlockAt(location.getBlockX(), location.getBlockZ(), heightmap);
+    }
+    // Paper end
+
     /**
      * Gets the highest block corresponding to the {@link HeightMap} at the
      * given coordinates.