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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Reflection.Emit;
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using HarmonyLib;
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using NitroxClient.MonoBehaviours.Cyclops;
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using NitroxModel.Helper;
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namespace NitroxPatcher.Patches.Dynamic;
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/// <summary>
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/// Registers the local player in the cyclops it enters.
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/// </summary>
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public sealed partial class SubRoot_OnPlayerEntered_Patch : NitroxPatch, IDynamicPatch
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{
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private static readonly MethodInfo TARGET_METHOD = Reflect.Method((SubRoot t) => t.OnPlayerEntered(default(Player)));
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private static readonly OpCode START_INJECTION_CODE = OpCodes.Ldarg_0;
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private static readonly OpCode START_INJECTION_CODE_INVINCIBLE = OpCodes.Stfld;
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private static readonly FieldInfo LIVEMIXIN_INVINCIBLE = Reflect.Field((LiveMixin t) => t.invincible);
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/* There is a bug, where Subroot.live is not loaded when starting in a cyclops. Therefore this codepiece needs to check that and jump accordingly if not present
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*
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* For this change
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*
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* this.live.invincible = false
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*
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* to
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*
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* if (this.live != null)
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* {
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* this.live.invincible = false
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* }
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*/
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public static IEnumerable<CodeInstruction> Transpiler(MethodBase original, IEnumerable<CodeInstruction> instructions, ILGenerator generator)
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{
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List<CodeInstruction> instructionList = instructions.ToList();
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int injectionPoint = 0;
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Label newJumpPoint = generator.DefineLabel();
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for (int i = 3; i < instructionList.Count; i++)
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{
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if (instructionList[i].opcode == START_INJECTION_CODE_INVINCIBLE &&
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Equals(instructionList[i].operand, LIVEMIXIN_INVINCIBLE))
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{
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if (instructionList[i - 3].opcode == START_INJECTION_CODE)
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{
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instructionList[i + 1].labels.Add(newJumpPoint);
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injectionPoint = i - 3;
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}
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}
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}
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if (injectionPoint != 0)
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{
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MethodInfo op_inequality_method = typeof(UnityEngine.Object).GetMethod("op_Inequality");
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List<CodeInstruction> injectedInstructions = new()
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{
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new CodeInstruction(OpCodes.Ldarg_0),
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new CodeInstruction(OpCodes.Ldfld, Reflect.Field((SubRoot t) => t.live)),
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new CodeInstruction(OpCodes.Ldnull),
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new CodeInstruction(OpCodes.Call, op_inequality_method),
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new CodeInstruction(OpCodes.Brfalse, newJumpPoint)
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};
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instructionList.InsertRange(injectionPoint, injectedInstructions);
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}
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return instructionList;
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}
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public static void Postfix(SubRoot __instance)
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{
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if (__instance.TryGetComponent(out NitroxCyclops nitroxCyclops))
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{
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nitroxCyclops.OnLocalPlayerEnter();
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}
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}
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}
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