Paper/patches/server/0291-Add-Heightmap-API.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Tue, 1 Jan 2019 02:22:01 -0800
Subject: [PATCH] Add Heightmap API


diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index cbb7ffab637e640eb2cedfac63c13392147f7e12..c3cf58e297ca56d31bd4b1bcbef201afbcee0cb6 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -229,6 +229,29 @@ public class CraftWorld extends CraftRegionAccessor implements World {
         return CraftBlock.at(this.world, new BlockPos(x, y, z));
     }
 
+    // Paper start - Implement heightmap api
+    @Override
+    public int getHighestBlockYAt(final int x, final int z, final com.destroystokyo.paper.HeightmapType heightmap) throws UnsupportedOperationException {
+        this.getChunkAt(x >> 4, z >> 4); // heightmap will ret 0 on unloaded areas
+
+        switch (heightmap) {
+            case LIGHT_BLOCKING:
+                throw new UnsupportedOperationException(); // TODO
+                //return this.world.getHighestBlockY(HeightMap.Type.LIGHT_BLOCKING, x, z);
+            case ANY:
+                return this.world.getHeight(net.minecraft.world.level.levelgen.Heightmap.Types.WORLD_SURFACE, x, z);
+            case SOLID:
+                return this.world.getHeight(net.minecraft.world.level.levelgen.Heightmap.Types.OCEAN_FLOOR, x, z);
+            case SOLID_OR_LIQUID:
+                return this.world.getHeight(net.minecraft.world.level.levelgen.Heightmap.Types.MOTION_BLOCKING, x, z);
+            case SOLID_OR_LIQUID_NO_LEAVES:
+                return this.world.getHeight(net.minecraft.world.level.levelgen.Heightmap.Types.MOTION_BLOCKING_NO_LEAVES, x, z);
+            default:
+                throw new UnsupportedOperationException();
+        }
+    }
+    // Paper end
+
     @Override
     public Location getSpawnLocation() {
         BlockPos spawn = this.world.getSharedSpawnPos();