Piglin portal spawn modifier

Allows changing the modifier for the piglin spawn chance from a portal block based on the world difficulty.

For example, with the default vanilla value of 2000 there is a 2 out of 2000 chance for a piglin to spawn in a portal block each tick in normal mode.

Equation: random.nextInt(modifier) < difficulty

Difficulties:
0 - peaceful
1 - easy
2 - normal
3 - hard

patches/server/0149-Piglin-portal-spawn-modifier.patch

@@ -1,52 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: William Blake Galbreath <Blake.Galbreath@GMail.com>
-Date: Tue, 13 Apr 2021 11:19:35 -0500
-Subject: [PATCH] Piglin portal spawn modifier
-
-Allows changing the modifier for the piglin spawn chance from a portal block
-based on the world difficulty.
-
-For example, with the default vanilla value of 2000 there is a 2 out of 2000 chance
-for a piglin to spawn in a portal block each tick in normal mode.
-
-Equation: random.nextInt(modifier) < difficulty
-
-Difficulties:
-0 - peaceful
-1 - easy
-2 - normal
-3 - hard
-
-diff --git a/net/minecraft/world/level/block/NetherPortalBlock.java b/net/minecraft/world/level/block/NetherPortalBlock.java
-index 5169cba4c43d80ce3597c57bf7d40bd0148ec8a0..2d53c57c961fa8977e37931775863665381595eb 100644
---- a/net/minecraft/world/level/block/NetherPortalBlock.java
-+++ b/net/minecraft/world/level/block/NetherPortalBlock.java
-@@ -78,7 +78,7 @@ public class NetherPortalBlock extends Block implements Portal {
- 
-     @Override
-     protected void randomTick(BlockState state, ServerLevel world, BlockPos pos, RandomSource random) {
--        if (world.spigotConfig.enableZombiePigmenPortalSpawns && world.dimensionType().natural() && world.getGameRules().getBoolean(GameRules.RULE_DOMOBSPAWNING) && random.nextInt(2000) < world.getDifficulty().getId()) { // Spigot
-+        if (world.spigotConfig.enableZombiePigmenPortalSpawns && world.dimensionType().natural() && world.getGameRules().getBoolean(GameRules.RULE_DOMOBSPAWNING) && random.nextInt(world.purpurConfig.piglinPortalSpawnModifier) < world.getDifficulty().getId()) { // Spigot // Purpur
-             while (world.getBlockState(pos).is((Block) this)) {
-                 pos = pos.below();
-             }
-diff --git a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
-index e85eb5d3dbf35c89295302db5431a7b3cb2d3ba1..be247fe9ca24407350044b020db613ce9a70ff26 100644
---- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
-+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
-@@ -1715,6 +1715,7 @@ public class PurpurWorldConfig {
-     public double piglinScale = 1.0D;
-     public boolean piglinBypassMobGriefing = false;
-     public boolean piglinTakeDamageFromWater = false;
-+    public int piglinPortalSpawnModifier = 2000;
-     private void piglinSettings() {
-         piglinRidable = getBoolean("mobs.piglin.ridable", piglinRidable);
-         piglinRidableInWater = getBoolean("mobs.piglin.ridable-in-water", piglinRidableInWater);
-@@ -1728,6 +1729,7 @@ public class PurpurWorldConfig {
-         piglinScale = Mth.clamp(getDouble("mobs.piglin.attributes.scale", piglinScale), 0.0625D, 16.0D);
-         piglinBypassMobGriefing = getBoolean("mobs.piglin.bypass-mob-griefing", piglinBypassMobGriefing);
-         piglinTakeDamageFromWater = getBoolean("mobs.piglin.takes-damage-from-water", piglinTakeDamageFromWater);
-+        piglinPortalSpawnModifier = getInt("mobs.piglin.portal-spawn-modifier", piglinPortalSpawnModifier);
-     }
- 
-     public boolean piglinBruteRidable = false;

purpur-server/minecraft-patches/sources/net/minecraft/world/level/block/NetherPortalBlock.java.patch

@@ -0,0 +1,11 @@
+--- a/net/minecraft/world/level/block/NetherPortalBlock.java
++++ b/net/minecraft/world/level/block/NetherPortalBlock.java
+@@ -72,7 +_,7 @@
+     protected void randomTick(BlockState state, ServerLevel level, BlockPos pos, RandomSource random) {
+         if (level.spigotConfig.enableZombiePigmenPortalSpawns && level.dimensionType().natural() // Spigot
+             && level.getGameRules().getBoolean(GameRules.RULE_DOMOBSPAWNING)
+-            && random.nextInt(2000) < level.getDifficulty().getId()) {
++            && random.nextInt(level.purpurConfig.piglinPortalSpawnModifier) < level.getDifficulty().getId()) { // Purpur - Piglin portal spawn modifier
+             while (level.getBlockState(pos).is(this)) {
+                 pos = pos.below();
+             }

purpur-server/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java

@@ -1707,6 +1707,7 @@ public class PurpurWorldConfig {
     public double piglinScale = 1.0D;
     public boolean piglinBypassMobGriefing = false;
     public boolean piglinTakeDamageFromWater = false;
+    public int piglinPortalSpawnModifier = 2000;
     private void piglinSettings() {
         piglinRidable = getBoolean("mobs.piglin.ridable", piglinRidable);
         piglinRidableInWater = getBoolean("mobs.piglin.ridable-in-water", piglinRidableInWater);
@@ -1720,6 +1721,7 @@ public class PurpurWorldConfig {
         piglinScale = Mth.clamp(getDouble("mobs.piglin.attributes.scale", piglinScale), 0.0625D, 16.0D);
         piglinBypassMobGriefing = getBoolean("mobs.piglin.bypass-mob-griefing", piglinBypassMobGriefing);
         piglinTakeDamageFromWater = getBoolean("mobs.piglin.takes-damage-from-water", piglinTakeDamageFromWater);
+        piglinPortalSpawnModifier = getInt("mobs.piglin.portal-spawn-modifier", piglinPortalSpawnModifier);
     }
 
     public boolean piglinBruteRidable = false;