Paper/patches/server/0726-Configurable-feature-seeds.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Nassim Jahnke <nassim@njahnke.dev>
Date: Tue, 31 Aug 2021 17:05:27 +0200
Subject: [PATCH] Configurable feature seeds

Co-authored-by: Thonk <30448663+ExcessiveAmountsOfZombies@users.noreply.github.com>

diff --git a/src/main/java/co/aikar/timings/TimingsExport.java b/src/main/java/co/aikar/timings/TimingsExport.java
index 1080e1f67afe5574baca0df50cdb1d029a7a586a..a2f71a6d1a9e98133dff6cd0f625da9435a8af14 100644
--- a/src/main/java/co/aikar/timings/TimingsExport.java
+++ b/src/main/java/co/aikar/timings/TimingsExport.java
@@ -288,7 +288,7 @@ public class TimingsExport extends Thread {
         JSONObject object = new JSONObject();
         for (String key : config.getKeys(false)) {
             String fullKey = (parentKey != null ? parentKey + "." + key : key);
-            if (fullKey.equals("database") || fullKey.equals("settings.bungeecord-addresses") || TimingsManager.hiddenConfigs.contains(fullKey) || key.startsWith("seed-") || key.equals("worldeditregentempworld")) {
+            if (fullKey.equals("database") || fullKey.equals("settings.bungeecord-addresses") || TimingsManager.hiddenConfigs.contains(fullKey) || key.startsWith("seed-") || key.equals("worldeditregentempworld") || key.equals("feature-seeds")) {
                 continue;
             }
             final Object val = config.get(key);
diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java b/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
index b975cca39e18fd274702543066971fcf0cc24186..a2abdcd161bae048f1c7fd40b3a93d909ebbd0b4 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
@@ -431,7 +431,14 @@ public abstract class ChunkGenerator {
                                 return (String) optional.orElseGet(placedfeature::toString);
                             };
 
-                            seededrandom.setFeatureSeed(i, l1, l);
+                            // Paper start - change populationSeed used in random
+                            long featurePopulationSeed = i;
+                            final long configFeatureSeed = generatoraccessseed.getMinecraftWorld().paperConfig().featureSeeds.features.getLong(placedfeature.feature());
+                            if (configFeatureSeed != -1) {
+                                featurePopulationSeed = seededrandom.setDecorationSeed(configFeatureSeed, blockposition.getX(), blockposition.getZ()); // See seededrandom.setDecorationSeed from above
+                            }
+                            seededrandom.setFeatureSeed(featurePopulationSeed, l1, l);
+                            // Paper end
 
                             try {
                                 generatoraccessseed.setCurrentlyGenerating(supplier1);