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/src/main/java/net/minecraft/world/level/block/NetherPortalBlock.java b/src/main/java/net/minecraft/world/level/block/NetherPortalBlock.java
index 2c085c4a154cb0f8a1d38453f43474a764398784..589b437e7c97c846410f293e2f014bdcd7cb333e 100644
--- a/src/main/java/net/minecraft/world/level/block/NetherPortalBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/NetherPortalBlock.java
@@ -52,7 +52,7 @@ public class NetherPortalBlock extends Block {
 
     @Override
     public 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 ec1d28071b7525273fedf338d0107fbb47312bdd..aa9ce2a40144906de402e287d4cb5e6bf33fd94f 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -1653,6 +1653,7 @@ public class PurpurWorldConfig {
     public double piglinMaxHealth = 16.0D;
     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);
@@ -1665,6 +1666,7 @@ public class PurpurWorldConfig {
         piglinMaxHealth = getDouble("mobs.piglin.attributes.max_health", piglinMaxHealth);
         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;