mirror of
https://github.com/kwsch/PKHeX
synced 2024-12-30 06:13:11 +00:00
335 lines
10 KiB
C#
335 lines
10 KiB
C#
using System;
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using System.Runtime.CompilerServices;
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namespace PKHeX.Core;
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/// <summary>
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/// Contains logic for the Generation 8 (Legends: Arceus) overworld spawns that walk around the overworld.
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/// </summary>
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public static class Overworld8aRNG
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{
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private static uint GetShinyPID(int tid, int sid, uint pid, int type)
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{
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return (uint)(((tid ^ sid ^ (pid & 0xFFFF) ^ type) << 16) | (pid & 0xFFFF));
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}
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private static bool GetIsShiny(int tid, int sid, uint pid)
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{
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return GetShinyXor(pid, (uint)((sid << 16) | tid)) < 16;
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}
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private static uint GetShinyXor(uint pid, uint oid)
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{
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var xor = pid ^ oid;
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return (xor ^ (xor >> 16)) & 0xFFFF;
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}
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private const int UNSET = -1;
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public static (ulong GroupSeed, ulong SlotSeed) ApplyDetails(PKM pk, EncounterCriteria criteria, in OverworldParam8a para, bool giveAlphaMove)
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{
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int ctr = 0;
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const int maxAttempts = 50_000;
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var fakeRand = new Xoroshiro128Plus(Util.Rand.Rand64());
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Xoroshiro128Plus groupRand;
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ulong groupSeed;
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ulong slotSeed;
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do
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{
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groupSeed = fakeRand.Next();
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groupRand = new Xoroshiro128Plus(groupSeed);
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slotSeed = groupRand.Next();
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var slotRand = new Xoroshiro128Plus(slotSeed);
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_ = slotRand.Next();
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var entitySeed = slotRand.Next();
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var result = TryApplyFromSeed(pk, criteria, para, entitySeed);
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if (result)
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break;
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} while (++ctr != maxAttempts);
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// Failed, fall back to Unrestricted and just put whatever.
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if (ctr >= maxAttempts)
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{
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groupSeed = fakeRand.Next();
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groupRand = new Xoroshiro128Plus(groupSeed);
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var slotRand = new Xoroshiro128Plus(slotSeed);
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_ = slotRand.Next();
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var entitySeed = slotRand.Next();
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TryApplyFromSeed(pk, EncounterCriteria.Unrestricted, para, entitySeed);
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}
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if (giveAlphaMove)
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ApplyRandomAlphaMove(pk, groupRand.Next());
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return (groupSeed, slotSeed);
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}
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public static (ulong EntitySeed, ulong SlotRand) ApplyDetails(PKM pk, in OverworldParam8a para, bool giveAlphaMove, ref Xoroshiro128Plus groupRand)
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{
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var slotSeed = groupRand.Next();
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var alphaSeed = groupRand.Next();
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var slotRand = new Xoroshiro128Plus(slotSeed);
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var slotRoll = slotRand.Next();
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var entitySeed = slotRand.Next();
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TryApplyFromSeed(pk, EncounterCriteria.Unrestricted, para, entitySeed);
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if (giveAlphaMove)
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ApplyRandomAlphaMove(pk, alphaSeed);
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return (entitySeed, slotRoll);
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}
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private static void ApplyRandomAlphaMove(PKM pk, ulong seed)
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{
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var pi = (PersonalInfoLA)PersonalTable.LA.GetFormEntry(pk.Species, pk.Form);
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var count = pi.GetMoveShopCount();
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if (count == 0 || pk is not PA8 pa8)
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return;
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var index = GetRandomAlphaMoveIndex(seed, count);
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var alphaIndex = pi.GetMoveShopIndex(index);
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var alphaMove = Legal.MoveShop8_LA[alphaIndex];
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pa8.AlphaMove = alphaMove;
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}
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private static int GetRandomAlphaMoveIndex(ulong alphaSeed, int count)
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{
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var alphaRand = new Xoroshiro128Plus(alphaSeed);
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return (int)alphaRand.NextInt((uint)count);
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}
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public static bool TryApplyFromSeed(PKM pk, EncounterCriteria criteria, in OverworldParam8a para, ulong seed)
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{
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var rand = new Xoroshiro128Plus(seed);
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// Encryption Constant
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pk.EncryptionConstant = (uint)rand.NextInt();
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// PID
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var fakeTID = (uint)rand.NextInt();
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uint pid = (uint)rand.NextInt();
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bool isShiny = false;
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if (para.Shiny == Shiny.Random) // let's decide if it's shiny or not!
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{
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for (int i = 1; i < para.RollCount; i++)
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{
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isShiny = GetShinyXor(pid, fakeTID) < 16;
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if (isShiny)
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break;
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pid = (uint)rand.NextInt();
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}
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}
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else
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{
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// no need to calculate a fake trainer
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isShiny = para.Shiny == Shiny.Always;
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}
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ForceShinyState(pk, isShiny, ref pid);
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if (para.Shiny == Shiny.Never)
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{
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if (GetIsShiny(pk.TID, pk.SID, pid))
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return false;
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}
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else if (para.Shiny != Shiny.Random)
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{
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if (!GetIsShiny(pk.TID, pk.SID, pid))
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return false;
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if (para.Shiny == Shiny.AlwaysSquare && pk.ShinyXor != 0)
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return false;
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if (para.Shiny == Shiny.AlwaysStar && pk.ShinyXor == 0)
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return false;
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}
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pk.PID = pid;
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Span<int> ivs = stackalloc[] { UNSET, UNSET, UNSET, UNSET, UNSET, UNSET };
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const int MAX = 31;
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for (int i = 0; i < para.FlawlessIVs; i++)
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{
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int index;
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do { index = (int)rand.NextInt(6); }
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while (ivs[index] != UNSET);
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ivs[index] = MAX;
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}
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for (int i = 0; i < ivs.Length; i++)
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{
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if (ivs[i] == UNSET)
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ivs[i] = (int)rand.NextInt(32);
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}
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if (!criteria.IsIVsCompatible(ivs, 8))
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return false;
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pk.IV_HP = ivs[0];
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pk.IV_ATK = ivs[1];
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pk.IV_DEF = ivs[2];
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pk.IV_SPA = ivs[3];
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pk.IV_SPD = ivs[4];
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pk.IV_SPE = ivs[5];
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pk.RefreshAbility((int)rand.NextInt(2));
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int gender = para.GenderRatio switch
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{
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PersonalInfo.RatioMagicGenderless => 2,
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PersonalInfo.RatioMagicFemale => 1,
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PersonalInfo.RatioMagicMale => 0,
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_ => (int)rand.NextInt(252) + 1 < para.GenderRatio ? 1 : 0,
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};
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if (gender != criteria.Gender && criteria.Gender != -1)
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return false;
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pk.Gender = gender;
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int nature = (int)rand.NextInt(25);
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pk.StatNature = pk.Nature = nature;
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var (height, weight) = para.IsAlpha
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? (byte.MaxValue, byte.MaxValue)
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: ((byte)((int)rand.NextInt(0x81) + (int)rand.NextInt(0x80)),
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(byte)((int)rand.NextInt(0x81) + (int)rand.NextInt(0x80)));
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if (pk is IScaledSize s)
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{
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s.HeightScalar = height;
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s.WeightScalar = weight;
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if (pk is IScaledSizeValue a)
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{
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a.ResetHeight();
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a.ResetWeight();
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}
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}
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return true;
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}
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public static bool Verify(PKM pk, ulong seed, in OverworldParam8a para)
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{
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var rand = new Xoroshiro128Plus(seed);
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var ec = (uint)rand.NextInt();
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if (ec != pk.EncryptionConstant)
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return false;
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var fakeTID = (uint)rand.NextInt();
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uint pid = (uint)rand.NextInt();
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bool isShiny = false;
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if (para.Shiny == Shiny.Random) // let's decide if it's shiny or not!
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{
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for (int i = 1; i < para.RollCount; i++)
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{
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isShiny = GetShinyXor(pid, fakeTID) < 16;
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if (isShiny)
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break;
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pid = (uint)rand.NextInt();
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}
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}
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else
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{
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// no need to calculate a fake trainer
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isShiny = para.Shiny == Shiny.Always;
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}
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ForceShinyState(pk, isShiny, ref pid);
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if (pk.PID != pid)
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return false;
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Span<int> ivs = stackalloc[] { UNSET, UNSET, UNSET, UNSET, UNSET, UNSET };
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const int MAX = 31;
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for (int i = 0; i < para.FlawlessIVs; i++)
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{
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int index;
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do { index = (int)rand.NextInt(6); }
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while (ivs[index] != UNSET);
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ivs[index] = MAX;
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}
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for (int i = 0; i < 6; i++)
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{
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if (ivs[i] == UNSET)
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ivs[i] = (int)rand.NextInt(32);
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}
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if (pk.IV_HP != ivs[0])
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return false;
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if (pk.IV_ATK != ivs[1])
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return false;
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if (pk.IV_DEF != ivs[2])
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return false;
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if (pk.IV_SPA != ivs[3])
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return false;
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if (pk.IV_SPD != ivs[4])
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return false;
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if (pk.IV_SPE != ivs[5])
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return false;
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int abil = (int)rand.NextInt(2);
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abil <<= 1; // 1/2/4
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var current = pk.AbilityNumber;
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if (abil == 4 && current != 4)
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return false;
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// else, for things that were made Hidden Ability, defer to Ability Checks (Ability Patch)
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int gender = para.GenderRatio switch
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{
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PersonalInfo.RatioMagicGenderless => 2,
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PersonalInfo.RatioMagicFemale => 1,
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PersonalInfo.RatioMagicMale => 0,
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_ => (int)rand.NextInt(252) + 1 < para.GenderRatio ? 1 : 0,
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};
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if (pk.Gender != gender)
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return false;
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var nature = (int)rand.NextInt(25);
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if (pk.Nature != nature)
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return false;
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var (height, weight) = para.IsAlpha
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? (byte.MaxValue, byte.MaxValue)
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: ((byte)((int)rand.NextInt(0x81) + (int)rand.NextInt(0x80)),
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(byte)((int)rand.NextInt(0x81) + (int)rand.NextInt(0x80)));
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if (pk is IScaledSize s)
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{
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if (s.HeightScalar != height)
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return false;
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if (s.WeightScalar != weight)
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return false;
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}
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return true;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void ForceShinyState(PKM pk, bool isShiny, ref uint pid)
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{
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if (isShiny)
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{
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if (!GetIsShiny(pk.TID, pk.SID, pid))
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pid = GetShinyPID(pk.TID, pk.SID, pid, 0);
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}
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else
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{
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if (GetIsShiny(pk.TID, pk.SID, pid))
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pid ^= 0x1000_0000;
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}
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}
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public static int GetRandomLevel(ulong slotSeed, byte LevelMin, byte LevelMax)
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{
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var delta = LevelMax - LevelMin;
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var xoro = new Xoroshiro128Plus(slotSeed);
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xoro.Next();
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xoro.Next(); // slot, entitySeed
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var amp = (int)xoro.NextInt((ulong)delta + 1);
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return LevelMin + amp;
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}
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}
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public readonly record struct OverworldParam8a(bool IsAlpha, byte GenderRatio, byte FlawlessIVs, byte RollCount, Shiny Shiny = Shiny.Random);
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