Improve hardcore RNG

src/main/java/eu/m724/tweaks/TweaksConfig.java

@@ -45,7 +45,7 @@ public record TweaksConfig(
         boolean updaterEnabled,
 
         boolean hardcoreEnabled,
-        float hardcoreChance,
+        double hardcoreChance,
 
         boolean sleepEnabled,
         boolean sleepInstant,
@@ -117,7 +117,7 @@ public record TweaksConfig(
         boolean updaterEnabled = config.getBoolean("updater.enabled");
 
         boolean hardcoreEnabled = config.getBoolean("hardcore.enabled");
-        float hardcoreChance = (float) config.getDouble("hardcore.chance");
+        double hardcoreChance = config.getDouble("hardcore.chance");
 
         boolean sleepEnabled = config.getBoolean("sleep.enabled");
         boolean sleepInstant = config.getBoolean("sleep.instant");

src/main/java/eu/m724/tweaks/hardcore/HardcoreManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2024  Minecon724
+ * Copyright (C) 2025  Minecon724
  * Tweaks724 is licensed under the GNU General Public License. See the LICENSE.md file
  * in the project root for the full license text.
  */
@@ -8,14 +8,40 @@ package eu.m724.tweaks.hardcore;
 
 import com.comphenix.protocol.PacketType;
 import com.comphenix.protocol.ProtocolLibrary;
-import com.comphenix.protocol.events.*;
+import com.comphenix.protocol.events.ListenerPriority;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+import eu.m724.tweaks.DebugLogger;
 import eu.m724.tweaks.TweaksConfig;
+import net.minecraft.world.level.levelgen.RandomSupport;
+import net.minecraft.world.level.levelgen.Xoroshiro128PlusPlus;
 import org.bukkit.plugin.Plugin;
 
+import java.math.BigDecimal;
+import java.math.BigInteger;
+
+// how we do it is much faster than any Random
 public class HardcoreManager {
-    private final float chance = TweaksConfig.getConfig().hardcoreChance();
+    private final double chance = TweaksConfig.getConfig().hardcoreChance();
+
+    private final long chanceLong = BigInteger.valueOf(Long.MIN_VALUE)
+            .add(
+                    new BigDecimal(
+                            BigInteger.valueOf(Long.MAX_VALUE).subtract(BigInteger.valueOf(Long.MIN_VALUE))
+                    ).multiply(
+                            BigDecimal.valueOf(chance)
+                    ).toBigInteger()
+            ).longValue();
+
+    private final Xoroshiro128PlusPlus rng = new Xoroshiro128PlusPlus(
+            RandomSupport.generateUniqueSeed(),
+            RandomSupport.generateUniqueSeed()
+    );
 
     public void init(Plugin plugin) {
+        DebugLogger.fine("Chance long: " + chanceLong);
+
         ProtocolLibrary.getProtocolManager().addPacketListener(new PacketAdapter(
                 plugin,
                 ListenerPriority.NORMAL,
@@ -24,9 +50,8 @@ public class HardcoreManager {
             @Override
             public void onPacketSending(PacketEvent event) {
                 PacketContainer packet = event.getPacket();
-                int entityId = packet.getIntegers().read(0);
 
-                if (chance > ((48271 * entityId) % 65537) / 65537f) // gotta be fast
+                if (rng.nextLong() < chanceLong)
                     // the "is hardcore" boolean https://wiki.vg/Protocol#Login_.28play.29
                     packet.getBooleans().write(0, true);
             }