Merge pull request 'Add TPSWarpUtils' (#245) from TPSWarp into master

Reviewed-on: #245
Reviewed-by: Lixfel <lixfel@steamwar.de>

SpigotCore_19/src/de/steamwar/core/ProtocolWrapper19.java

@@ -22,6 +22,7 @@ package de.steamwar.core;
 import com.comphenix.tinyprotocol.Reflection;
 import com.mojang.authlib.GameProfile;
 import com.mojang.datafixers.util.Pair;
+import net.minecraft.SystemUtils;
 import net.minecraft.network.protocol.game.ClientboundPlayerInfoRemovePacket;
 import net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket;
 import net.minecraft.world.level.EnumGamemode;
@@ -30,6 +31,7 @@ import org.bukkit.GameMode;
 import java.util.Collections;
 import java.util.EnumSet;
 import java.util.List;
+import java.util.function.LongSupplier;
 
 public class ProtocolWrapper19 implements ProtocolWrapper {
 
@@ -54,4 +56,9 @@ public class ProtocolWrapper19 implements ProtocolWrapper {
         updatePlayers.set(packet, Collections.singletonList(new ClientboundPlayerInfoUpdatePacket.b(profile.getId(), profile, false, 0, EnumGamemode.a(mode.getValue()), null, null)));
         return packet;
     }
+
+    @Override
+    public void initTPSWarp(LongSupplier longSupplier) {
+        SystemUtils.a = () -> System.nanoTime() + longSupplier.getAsLong();
+    }
 }

SpigotCore_Main/src/de/steamwar/core/ProtocolWrapper.java

@@ -23,6 +23,8 @@ import com.comphenix.tinyprotocol.Reflection;
 import com.mojang.authlib.GameProfile;
 import org.bukkit.GameMode;
 
+import java.util.function.LongSupplier;
+
 public interface ProtocolWrapper {
 
     Class<?> itemStack = Reflection.getClass("{nms.world.item}.ItemStack");
@@ -42,6 +44,11 @@ public interface ProtocolWrapper {
 
     Object playerInfoPacketConstructor(PlayerInfoAction action, GameProfile profile, GameMode mode);
 
+    default void initTPSWarp(LongSupplier longSupplier) {
+        Class systemUtils = Reflection.getClass("{nms}.SystemUtils");
+        Reflection.getField(systemUtils, LongSupplier.class, 0).set(systemUtils, (LongSupplier) () -> System.nanoTime() + longSupplier.getAsLong());
+    }
+
     enum PlayerInfoAction {
         ADD,
         GAMEMODE,

SpigotCore_Main/src/de/steamwar/core/TPSWarpUtils.java

@@ -0,0 +1,56 @@
+/*
+ *   This file is a part of the SteamWar software.
+ *
+ *   Copyright (C) 2023  SteamWar.de-Serverteam
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU Affero General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU Affero General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Affero General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.core;
+
+import com.comphenix.tinyprotocol.Reflection;
+import de.steamwar.core.Core;
+import lombok.experimental.UtilityClass;
+import org.bukkit.Bukkit;
+import org.bukkit.scheduler.BukkitTask;
+
+import java.util.function.LongSupplier;
+
+@UtilityClass
+public class TPSWarpUtils {
+
+    private static long nanoOffset = 0;
+    private static long nanoDOffset = 0;
+    private static BukkitTask bukkitTask = null;
+
+    static {
+        ProtocolWrapper.impl.initTPSWarp(() -> nanoOffset);
+    }
+
+    public static void warp(double tps) {
+        double d = 50 - (50 / (tps / 20.0));
+        nanoDOffset = Math.max(0, (long) (d * 1000000));
+        if (nanoDOffset == 0) {
+            if (bukkitTask == null) return;
+            bukkitTask.cancel();
+            bukkitTask = null;
+        } else if (bukkitTask == null) {
+            bukkitTask = Bukkit.getScheduler().runTaskTimer(Core.getInstance(), () -> nanoOffset += nanoDOffset, 1, 1);
+        }
+    }
+
+    public static boolean isWarping() {
+        return nanoDOffset > 0;
+    }
+}