mirror of
https://github.com/kwsch/PKHeX
synced 2024-12-24 03:13:18 +00:00
324 lines
10 KiB
C#
324 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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public static class Encounter9RNG
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{
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public static bool TryApply32<TEnc>(this TEnc enc, PK9 pk, in ulong init, in GenerateParam9 param, EncounterCriteria criteria)
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where TEnc : IEncounterTemplate, ITeraRaid9
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{
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const int maxCtr = 100_000;
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var rand = new Xoroshiro128Plus(init);
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for (int ctr = 0; ctr < maxCtr; ctr++)
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{
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uint seed = (uint)rand.NextInt(uint.MaxValue);
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if (!enc.CanBeEncountered(seed))
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continue;
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if (!GenerateData(pk, param, criteria, seed, param.IVs.IsSpecified))
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continue;
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var type = Tera9RNG.GetTeraType(seed, enc.TeraType, enc.Species, enc.Form);
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pk.TeraTypeOriginal = (MoveType)type;
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if (criteria.TeraType != -1 && type != criteria.TeraType)
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pk.SetTeraType(type); // sets the override type
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return true; // done.
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}
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return false;
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}
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public static bool TryApply64<TEnc>(this TEnc enc, PK9 pk, in ulong init, in GenerateParam9 param, EncounterCriteria criteria, bool ignoreIVs)
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where TEnc : ISpeciesForm, IGemType
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{
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var rand = new Xoroshiro128Plus(init);
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const int maxCtr = 100_000;
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for (int ctr = 0; ctr < maxCtr; ctr++)
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{
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ulong seed = rand.Next(); // fake cryptosecure
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if (!GenerateData(pk, param, criteria, seed, ignoreIVs))
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continue;
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var type = Tera9RNG.GetTeraType(seed, enc.TeraType, enc.Species, enc.Form);
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pk.TeraTypeOriginal = (MoveType)type;
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if (criteria.TeraType != -1 && type != criteria.TeraType)
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pk.SetTeraType(type); // sets the override type
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return true; // done.
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}
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return false;
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}
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/// <summary>
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/// Fills out an entity with details from the provided encounter template.
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/// </summary>
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/// <returns>False if the seed cannot generate data matching the criteria.</returns>
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public static bool GenerateData(PK9 pk, in GenerateParam9 enc, EncounterCriteria criteria, in ulong seed, bool ignoreIVs = false)
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{
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var rand = new Xoroshiro128Plus(seed);
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pk.EncryptionConstant = (uint)rand.NextInt(uint.MaxValue);
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var fakeTID = (uint)rand.NextInt();
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uint pid = (uint)rand.NextInt();
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bool isShiny;
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uint xor;
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if (enc.Shiny == Shiny.Random) // let's decide if it's shiny or not!
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{
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xor = GetShinyXor(pid, fakeTID);
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isShiny = xor < 16;
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if (isShiny && xor != 0)
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xor = 1;
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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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xor = 0;
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isShiny = enc.Shiny == Shiny.Always;
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}
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ForceShinyState(pk, isShiny, ref pid, xor);
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pk.PID = pid;
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const int UNSET = -1;
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Span<int> ivs = stackalloc[] { UNSET, UNSET, UNSET, UNSET, UNSET, UNSET };
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if (enc.IVs.IsSpecified)
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{
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enc.IVs.CopyToSpeedLast(ivs);
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}
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else
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{
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const int MAX = 31;
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for (int i = 0; i < enc.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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}
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if (!ignoreIVs && !criteria.IsIVsCompatible(ivs, 9))
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return false;
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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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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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int abil = enc.Ability switch
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{
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AbilityPermission.Any12H => (int)rand.NextInt(3) << 1,
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AbilityPermission.Any12 => (int)rand.NextInt(2) << 1,
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_ => (int)enc.Ability,
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};
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pk.RefreshAbility(abil >> 1);
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var gender_ratio = enc.GenderRatio;
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int gender = gender_ratio 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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_ => GetGender(gender_ratio, rand.NextInt(100)),
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};
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if (criteria.Gender != -1 && gender != criteria.Gender)
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return false;
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pk.Gender = gender;
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byte nature = enc.Nature != Nature.Random ? (byte)enc.Nature : pk.Species == (int)Species.Toxtricity
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? ToxtricityUtil.GetRandomNature(ref rand, pk.Form)
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: (byte)rand.NextInt(25);
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if (criteria.Nature != Nature.Random && nature != (int)criteria.Nature)
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return false;
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pk.Nature = pk.StatNature = nature;
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pk.HeightScalar = enc.Height != 0 ? enc.Height : (byte)(rand.NextInt(0x81) + rand.NextInt(0x80));
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pk.WeightScalar = enc.Weight != 0 ? enc.Weight : (byte)(rand.NextInt(0x81) + rand.NextInt(0x80));
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pk.Scale = enc.Scale != 0 ? enc.Scale : (byte)(rand.NextInt(0x81) + rand.NextInt(0x80));
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return true;
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}
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public static bool IsMatch(PKM pk, in GenerateParam9 enc, in ulong seed)
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{
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// same as above method
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var rand = new Xoroshiro128Plus(seed);
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if (pk.EncryptionConstant != (uint)rand.NextInt(uint.MaxValue))
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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;
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uint xor;
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if (enc.Shiny == Shiny.Random) // let's decide if it's shiny or not!
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{
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int i = 1;
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while (true)
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{
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xor = GetShinyXor(pid, fakeTID);
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isShiny = xor < 16;
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if (isShiny)
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{
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if (xor != 0)
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xor = 1;
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break;
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}
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if (i >= enc.RollCount)
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break;
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pid = (uint)rand.NextInt();
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i++;
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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 = enc.Shiny == Shiny.Always;
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xor = 0;
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}
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ForceShinyState(pk, isShiny, ref pid, xor);
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if (pk.PID != pid)
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return false;
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const int UNSET = -1;
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Span<int> ivs = stackalloc[] { UNSET, UNSET, UNSET, UNSET, UNSET, UNSET };
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if (enc.IVs.IsSpecified)
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{
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enc.IVs.CopyToSpeedLast(ivs);
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}
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else
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{
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const int MAX = 31;
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for (int i = 0; i < enc.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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}
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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 = enc.Ability switch
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{
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AbilityPermission.Any12H => (int)rand.NextInt(3) << 1,
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AbilityPermission.Any12 => (int)rand.NextInt(2) << 1,
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_ => (int)enc.Ability,
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};
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var gender_ratio = enc.GenderRatio;
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int gender = gender_ratio 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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_ => GetGender(gender_ratio, rand.NextInt(100)),
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};
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if (pk.Gender != gender)
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return false;
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byte nature = enc.Nature != Nature.Random ? (byte)enc.Nature : pk.Species == (int)Species.Toxtricity
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? ToxtricityUtil.GetRandomNature(ref rand, pk.Form)
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: (byte)rand.NextInt(25);
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if (pk.Nature != nature)
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return false;
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if (enc.Height == 0)
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{
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var value = (int)rand.NextInt(0x81) + (int)rand.NextInt(0x80);
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if (pk is IScaledSize s && s.HeightScalar != value)
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return false;
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}
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if (enc.Weight == 0)
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{
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var value = (int)rand.NextInt(0x81) + (int)rand.NextInt(0x80);
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if (pk is IScaledSize s && s.WeightScalar != value)
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return false;
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}
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if (enc.Scale == 0)
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{
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var value = (int)rand.NextInt(0x81) + (int)rand.NextInt(0x80);
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if (pk is IScaledSize3 s && s.Scale != value)
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return false;
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}
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return true;
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}
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public static int GetGender(in int ratio, in ulong rand100) => ratio switch
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{
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0x1F => rand100 < 12 ? 1 : 0, // 12.5%
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0x3F => rand100 < 25 ? 1 : 0, // 25%
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0x7F => rand100 < 50 ? 1 : 0, // 50%
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0xBF => rand100 < 75 ? 1 : 0, // 75%
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0xE1 => rand100 < 89 ? 1 : 0, // 87.5%
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_ => throw new ArgumentOutOfRangeException(nameof(ratio)),
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};
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void ForceShinyState(PKM pk, in bool isShiny, ref uint pid, uint xor)
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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, (int)xor);
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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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private static uint GetShinyPID(in int tid, in int sid, in uint pid, in 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(in int tid, in int sid, in uint pid)
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{
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return GetShinyXor(tid, sid, pid) < 16;
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}
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private static uint GetShinyXor(in int tid, in int sid, in uint pid)
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{
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return GetShinyXor(pid, (uint)((sid << 16) | tid));
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}
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private static uint GetShinyXor(in uint pid, in 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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public interface ITeraRaid9 : IGemType
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{
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bool IsDistribution { get; }
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byte Index { get; }
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byte Stars { get; }
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byte RandRate { get; }
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bool CanBeEncountered(uint seed);
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}
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