add rule optimizeFakePlayerSpawn

Author: OptiJava

src/main/java/io/github/optijava/opt_carpet_addition/OptCarpetSettings.java

@@ -152,5 +152,11 @@ public class OptCarpetSettings {
             category = RuleCategory.BUGFIX
     )
     public static boolean dropperCrashFix = false;
+
+    @Rule(
+            desc = "Always spawn offline fake player to reduce lagging",
+            category = RuleCategory.OPTIMIZATION
+    )
+    public static boolean optimizeFakePlayerSpawn = false;
 }
 

src/main/java/io/github/optijava/opt_carpet_addition/mixins/rule/optimizeFakePlayerSpawn/EntityPlayerMPFake_Mixin.java

@@ -0,0 +1,28 @@
+package io.github.optijava.opt_carpet_addition.mixins.rule.optimizeFakePlayerSpawn;
+
+import carpet.patches.EntityPlayerMPFake;
+import com.mojang.authlib.GameProfile;
+import io.github.optijava.opt_carpet_addition.OptCarpetSettings;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.util.UserCache;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import java.util.Optional;
+
+@Mixin(EntityPlayerMPFake.class)
+public abstract class EntityPlayerMPFake_Mixin {
+
+    @Redirect(
+            method = "createFake",
+            at = @At(value = "INVOKE", target = "Lnet/minecraft/util/UserCache;findByName(Ljava/lang/String;)Ljava/util/Optional;")
+    )
+    private static Optional<GameProfile> redirectCreateFake(UserCache instance, String playerName) {
+        if (OptCarpetSettings.optimizeFakePlayerSpawn) {
+            return Optional.of(new GameProfile(PlayerEntity.getOfflinePlayerUuid(playerName), playerName));
+        } else {
+            return instance.findByName(playerName);
+        }
+    }
+}

src/main/java/io/github/optijava/opt_carpet_addition/mixins/rule/optimizeFakePlayerSpawn/PlayerCommand_Mixin.java

@@ -0,0 +1,28 @@
+package io.github.optijava.opt_carpet_addition.mixins.rule.optimizeFakePlayerSpawn;
+
+import carpet.commands.PlayerCommand;
+import com.mojang.authlib.GameProfile;
+import io.github.optijava.opt_carpet_addition.OptCarpetSettings;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.util.UserCache;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import java.util.Optional;
+
+@Mixin(PlayerCommand.class)
+public abstract class PlayerCommand_Mixin {
+
+    @Redirect(
+            method = "cantSpawn",
+            at = @At(value = "INVOKE", target = "Lnet/minecraft/util/UserCache;findByName(Ljava/lang/String;)Ljava/util/Optional;")
+    )
+    private static Optional<GameProfile> redirectFindByName(UserCache instance, String playerName) {
+        if (OptCarpetSettings.optimizeFakePlayerSpawn) {
+            return Optional.of(new GameProfile(PlayerEntity.getOfflinePlayerUuid(playerName), playerName));
+        } else {
+            return instance.findByName(playerName);
+        }
+    }
+}

src/main/resources/opt-carpet-addition.mixins.json

@@ -22,7 +22,9 @@
     "rule.disabledNetherPortalSpawn.NetherPortalBlock_Mixin",
     "rule.disabledUpdateSuppressionErrorStackTrace.ThreadExecutor_Mixin",
     "rule.dropperCrashFix.DispenserBlock_Mixin",
-    "rule.dropperCrashFix.DropperBlock_Mixin"
+    "rule.dropperCrashFix.DropperBlock_Mixin",
+    "rule.optimizeFakePlayerSpawn.EntityPlayerMPFake_Mixin",
+    "rule.optimizeFakePlayerSpawn.PlayerCommand_Mixin"
   ],
   "client": [
     "rule.unescapeChatMessage.ChatMessageC2SPacket_Mixin",