mirror of
https://github.com/kwsch/PKHeX
synced 2024-12-14 14:42:35 +00:00
273 lines
9.4 KiB
C#
273 lines
9.4 KiB
C#
using System;
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namespace PKHeX.Core
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{
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/// <summary>
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/// Contains logic for the Generation 8b (BD/SP) roaming spawns.
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/// </summary>
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/// <remarks>
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/// Roaming encounters use the pokemon's 32-bit <see cref="PKM.EncryptionConstant"/> as RNG seed.
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/// </remarks>
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public static class Roaming8bRNG
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{
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private const int UNSET = -1;
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public static void ApplyDetails(PKM pk, EncounterCriteria criteria, Shiny shiny = Shiny.FixedValue, int flawless = -1)
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{
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if (shiny == Shiny.FixedValue)
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shiny = criteria.Shiny is Shiny.Random or Shiny.Never ? Shiny.Never : Shiny.Always;
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if (flawless == -1)
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flawless = 0;
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int ctr = 0;
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const int maxAttempts = 50_000;
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var rnd = Util.Rand;
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do
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{
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var seed = Util.Rand32(rnd);
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if (seed == int.MaxValue)
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continue; // Unity's Rand is [int.MinValue, int.MaxValue)
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if (TryApplyFromSeed(pk, criteria, shiny, flawless, seed))
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return;
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} while (++ctr != maxAttempts);
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TryApplyFromSeed(pk, EncounterCriteria.Unrestricted, shiny, flawless, Util.Rand32(rnd));
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}
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private static bool TryApplyFromSeed(PKM pk, EncounterCriteria criteria, Shiny shiny, int flawless, uint seed)
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{
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var xoro = new Xoroshiro128Plus8b(seed);
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// Encryption Constant
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pk.EncryptionConstant = seed;
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// PID
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var fakeTID = xoro.NextUInt(); // fakeTID
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var pid = xoro.NextUInt();
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pid = GetRevisedPID(fakeTID, pid, pk);
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if (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 (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 (shiny == Shiny.AlwaysSquare && pk.ShinyXor != 0)
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return false;
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if (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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// Check IVs: Create flawless IVs at random indexes, then the random IVs for not flawless.
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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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var determined = 0;
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while (determined < flawless)
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{
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var idx = (int)xoro.NextUInt(6);
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if (ivs[idx] != UNSET)
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continue;
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ivs[idx] = 31;
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determined++;
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}
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for (var 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)xoro.NextUInt(MAX + 1);
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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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// Ability
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pk.SetAbilityIndex((int)xoro.NextUInt(2));
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// Remainder
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var scale = (IScaledSize)pk;
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scale.HeightScalar = (byte)((int)xoro.NextUInt(0x81) + (int)xoro.NextUInt(0x80));
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scale.WeightScalar = (byte)((int)xoro.NextUInt(0x81) + (int)xoro.NextUInt(0x80));
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return true;
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}
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public static bool ValidateRoamingEncounter(PKM pk, Shiny shiny = Shiny.Random, int flawless = 0)
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{
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var seed = pk.EncryptionConstant;
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if (seed == int.MaxValue)
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return false; // Unity's Rand is [int.MinValue, int.MaxValue)
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var xoro = new Xoroshiro128Plus8b(seed);
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// Check PID
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var fakeTID = xoro.NextUInt(); // fakeTID
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var pid = xoro.NextUInt();
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pid = GetRevisedPID(fakeTID, pid, pk);
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if (pk.PID != pid)
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return false;
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// Check IVs: Create flawless IVs at random indexes, then the random IVs for not flawless.
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Span<int> ivs = stackalloc [] { UNSET, UNSET, UNSET, UNSET, UNSET, UNSET };
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var determined = 0;
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while (determined < flawless)
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{
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var idx = (int)xoro.NextUInt(6);
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if (ivs[idx] != UNSET)
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continue;
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ivs[idx] = 31;
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determined++;
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}
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for (var 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)xoro.NextUInt(31 + 1);
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}
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if (ivs[0] != pk.IV_HP ) return false;
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if (ivs[1] != pk.IV_ATK) return false;
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if (ivs[2] != pk.IV_DEF) return false;
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if (ivs[3] != pk.IV_SPA) return false;
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if (ivs[4] != pk.IV_SPD) return false;
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if (ivs[5] != pk.IV_SPE) return false;
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// Don't check Hidden ability, as roaming encounters are 1/2 only.
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if (pk.AbilityNumber != (1 << (int)xoro.NextUInt(2)))
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return false;
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return GetIsMatchEnd(pk, xoro) || GetIsMatchEndWithCuteCharm(pk, xoro) || GetIsMatchEndWithSynchronize(pk, xoro);
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}
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private static bool GetIsMatchEnd(PKM pk, Xoroshiro128Plus8b xoro)
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{
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// Check that gender matches
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var genderRatio = PersonalTable.BDSP.GetFormEntry(pk.Species, pk.Form).Gender;
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if (genderRatio == PersonalInfo.RatioMagicGenderless)
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{
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if (pk.Gender != (int)Gender.Genderless)
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return false;
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}
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else if (genderRatio == PersonalInfo.RatioMagicMale)
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{
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if (pk.Gender != (int)Gender.Male)
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return false;
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}
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else if (genderRatio == PersonalInfo.RatioMagicFemale)
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{
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if (pk.Gender != (int)Gender.Female)
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return false;
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}
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else
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{
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if (pk.Gender != (((int)xoro.NextUInt(253) + 1 < genderRatio) ? 1 : 0))
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return false;
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}
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// Check that the nature matches
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if (pk.Nature != (int)xoro.NextUInt(25))
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return false;
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return GetIsHeightWeightMatch(pk, xoro);
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}
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private static bool GetIsMatchEndWithCuteCharm(PKM pk, Xoroshiro128Plus8b xoro)
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{
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// Check that gender matches
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// Assume that the gender is a match due to cute charm.
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// Check that the nature matches
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if (pk.Nature != (int)xoro.NextUInt(25))
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return false;
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return GetIsHeightWeightMatch(pk, xoro);
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}
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private static bool GetIsMatchEndWithSynchronize(PKM pk, Xoroshiro128Plus8b xoro)
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{
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// Check that gender matches
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var genderRatio = PersonalTable.BDSP.GetFormEntry(pk.Species, pk.Form).Gender;
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if (genderRatio == PersonalInfo.RatioMagicGenderless)
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{
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if (pk.Gender != (int)Gender.Genderless)
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return false;
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}
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else if (genderRatio == PersonalInfo.RatioMagicMale)
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{
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if (pk.Gender != (int)Gender.Male)
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return false;
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}
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else if (genderRatio == PersonalInfo.RatioMagicFemale)
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{
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if (pk.Gender != (int)Gender.Female)
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return false;
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}
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else
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{
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if (pk.Gender != (((int)xoro.NextUInt(253) + 1 < genderRatio) ? 1 : 0))
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return false;
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}
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// Assume that the nature is a match due to synchronize.
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return GetIsHeightWeightMatch(pk, xoro);
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}
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private static bool GetIsHeightWeightMatch(PKM pk, Xoroshiro128Plus8b xoro)
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{
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// Check height/weight
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if (pk is not IScaledSize s)
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return false;
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var height = xoro.NextUInt(0x81) + xoro.NextUInt(0x80);
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var weight = xoro.NextUInt(0x81) + xoro.NextUInt(0x80);
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return s.HeightScalar == height && s.WeightScalar == weight;
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}
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private static uint GetRevisedPID(uint fakeTID, uint pid, ITrainerID tr)
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{
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var xor = GetShinyXor(pid, fakeTID);
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var newXor = GetShinyXor(pid, (uint)(tr.TID | (tr.SID << 16)));
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var fakeRare = GetRareType(xor);
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var newRare = GetRareType(newXor);
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if (fakeRare == newRare)
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return pid;
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var isShiny = xor < 16;
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if (isShiny)
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return (((uint)(tr.TID ^ tr.SID) ^ (pid & 0xFFFF) ^ (xor == 0 ? 0u : 1u)) << 16) | (pid & 0xFFFF); // force same shiny star type
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return pid ^ 0x1000_0000;
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}
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private static Shiny GetRareType(uint xor) => xor switch
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{
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0 => Shiny.AlwaysSquare,
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< 16 => Shiny.AlwaysStar,
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_ => Shiny.Never,
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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 GetIsShiny(pid, (uint)((sid << 16) | tid));
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}
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private static bool GetIsShiny(uint pid, uint oid) => GetShinyXor(pid, oid) < 16;
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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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}
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}
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