From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Brokkonaut <hannos17@gmx.de>
Date: Sat, 18 Dec 2021 08:26:55 +0100
Subject: [PATCH] Make water animal spawn height configurable


diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index b2d9dbf4e006899a932bd6bed40228d4f744d865..100de7e366c4ea8ce158b0fc0258e4db0ee83249 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -426,6 +426,24 @@ public class PaperWorldConfig {
         mobSpawnerTickRate = getInt("mob-spawner-tick-rate", 1);
     }
 
+    public Integer waterAnimalMaxSpawnHeight;
+    private void waterAnimalMaxSpawnHeight() {
+        String v = getString("wateranimal-spawn-height.maximum", "default");
+        try {
+            waterAnimalMaxSpawnHeight = Integer.parseInt(v);
+        } catch (NumberFormatException ignored) {
+        }
+    }
+
+    public Integer waterAnimalMinSpawnHeight;
+    private void waterAnimalMinSpawnHeight() {
+        String v = getString("wateranimal-spawn-height.minimum", "default");
+        try {
+            waterAnimalMinSpawnHeight = Integer.parseInt(v);
+        } catch (NumberFormatException ignored) {
+        }
+    }
+
     public int containerUpdateTickRate;
     private void containerUpdateTickRate() {
         containerUpdateTickRate = getInt("container-update-tick-rate", 1);
diff --git a/src/main/java/net/minecraft/world/entity/animal/WaterAnimal.java b/src/main/java/net/minecraft/world/entity/animal/WaterAnimal.java
index 522abd880c1e7f7c9026f0ab6457bc649f11802c..1b6d426b44e200b3634c0a9ac7c3a315841ada40 100644
--- a/src/main/java/net/minecraft/world/entity/animal/WaterAnimal.java
+++ b/src/main/java/net/minecraft/world/entity/animal/WaterAnimal.java
@@ -79,6 +79,10 @@ public abstract class WaterAnimal extends PathfinderMob {
     public static boolean checkSurfaceWaterAnimalSpawnRules(EntityType<? extends WaterAnimal> type, LevelAccessor world, MobSpawnType reason, BlockPos pos, RandomSource random) {
         int i = world.getSeaLevel();
         int j = i - 13;
+        // Paper start
+        i = world.getMinecraftWorld().paperConfig.waterAnimalMaxSpawnHeight != null ? world.getMinecraftWorld().paperConfig.waterAnimalMaxSpawnHeight : i;
+        j = world.getMinecraftWorld().paperConfig.waterAnimalMinSpawnHeight != null ? world.getMinecraftWorld().paperConfig.waterAnimalMinSpawnHeight : j;
+        // Paper end
         return pos.getY() >= j && pos.getY() <= i && world.getFluidState(pos.below()).is(FluidTags.WATER) && world.getBlockState(pos.above()).is(Blocks.WATER);
     }
 }