public static bool ValidateOverworldEncounter(PKM pk, uint seed, Shiny shiny = Shiny.FixedValue, int flawless = -1)
{
// is the seed Xoroshiro determined, or just truncated state?
if (seed == uint.MaxValue)
{
return(false);
}
var xoro = new Xoroshiro128Plus(seed);
var ec = (uint)xoro.NextInt(uint.MaxValue);
if (ec != pk.EncryptionConstant)
{
return(false);
}
var pid = (uint)xoro.NextInt(uint.MaxValue);
if (!IsPIDValid(pk, pid, shiny))
{
return(false);
}
var actualCount = flawless == -1 ? GetIsMatchEnd(pk, xoro) : GetIsMatchEnd(pk, xoro, flawless, flawless);
return(actualCount != NoMatchIVs);
}
/// <summary>
/// Obtains the original seed for the Generation 8 overworld wild encounter.
/// </summary>
/// <param name="pk">Entity to check for</param>
/// <returns>Seed</returns>
public static uint GetOriginalSeed(PKM pk)
{
var seed = pk.EncryptionConstant - unchecked ((uint)Xoroshiro128Plus.XOROSHIRO_CONST);
if (seed == 0xD5B9C463) // Collision seed with the 0xFFFFFFFF re-roll.
{
var xoro = new Xoroshiro128Plus(seed);
/* ec */ xoro.NextInt(uint.MaxValue);
var pid = xoro.NextInt(uint.MaxValue);
if (pid != pk.PID)
{
return(0xDD6295A4);
}
}
return(seed);
}
private static bool TryApplyFromSeed(PKM pk, EncounterCriteria criteria, Shiny shiny, int flawless, uint seed)
{
var xoro = new Xoroshiro128Plus(seed);
// Encryption Constant
pk.EncryptionConstant = (uint)xoro.NextInt(uint.MaxValue);
// PID
var pid = (uint)xoro.NextInt(uint.MaxValue);
if (shiny == Shiny.Never)
{
if (GetIsShiny(pk.TID, pk.SID, pid))
{
pid ^= 0x1000_0000;
}
}
else if (shiny != Shiny.Random)
{
if (!GetIsShiny(pk.TID, pk.SID, pid))
{
pid = GetShinyPID(pk.TID, pk.SID, pid, 0);
}
if (shiny == Shiny.AlwaysSquare && pk.ShinyXor != 0)
{
return(false);
}
if (shiny == Shiny.AlwaysStar && pk.ShinyXor == 0)
{
return(false);
}
}
pk.PID = pid;
// IVs
Span <int> ivs = stackalloc[] { UNSET, UNSET, UNSET, UNSET, UNSET, UNSET };
const int MAX = 31;
for (int i = 0; i < flawless; i++)
{
int index;
do
{
index = (int)xoro.NextInt(6);
}while (ivs[index] != UNSET);
ivs[index] = MAX;
}
for (int i = 0; i < ivs.Length; i++)
{
if (ivs[i] == UNSET)
{
ivs[i] = (int)xoro.NextInt(32);
}
}
if (!criteria.IsIVsCompatible(ivs, 8))
{
return(false);
}
pk.IV_HP = ivs[0];
pk.IV_ATK = ivs[1];
pk.IV_DEF = ivs[2];
pk.IV_SPA = ivs[3];
pk.IV_SPD = ivs[4];
pk.IV_SPE = ivs[5];
// Remainder
var scale = (IScaledSize)pk;
scale.HeightScalar = (byte)((int)xoro.NextInt(0x81) + (int)xoro.NextInt(0x80));
scale.WeightScalar = (byte)((int)xoro.NextInt(0x81) + (int)xoro.NextInt(0x80));
return(true);
}
private static int GetIsMatchEnd(PKM pk, Xoroshiro128Plus xoro, int start = 0, int end = 3)
{
bool skip1 = start == 0 && end == 3;
for (int iv_count = start; iv_count <= end; iv_count++)
{
if (skip1 && iv_count == 1)
{
continue;
}
var copy = xoro;
Span <int> ivs = stackalloc [] { UNSET, UNSET, UNSET, UNSET, UNSET, UNSET };
const int MAX = 31;
for (int i = 0; i < iv_count; i++)
{
int index;
do
{
index = (int)copy.NextInt(6);
} while (ivs[index] != UNSET);
ivs[index] = MAX;
}
for (var i = 0; i < ivs.Length; i++)
{
if (ivs[i] == UNSET)
{
ivs[i] = (int)copy.NextInt(31 + 1);
}
}
if (ivs[0] != pk.IV_HP)
{
continue;
}
if (ivs[1] != pk.IV_ATK)
{
continue;
}
if (ivs[2] != pk.IV_DEF)
{
continue;
}
if (ivs[3] != pk.IV_SPA)
{
continue;
}
if (ivs[4] != pk.IV_SPD)
{
continue;
}
if (ivs[5] != pk.IV_SPE)
{
continue;
}
if (pk is not IScaledSize s)
{
continue;
}
var height = (int)copy.NextInt(0x81) + (int)copy.NextInt(0x80);
if (s.HeightScalar != height)
{
continue;
}
var weight = (int)copy.NextInt(0x81) + (int)copy.NextInt(0x80);
if (s.WeightScalar != weight)
{
continue;
}
return(iv_count);
}
return(NoMatchIVs);
}
public bool Equals(Xoroshiro128Plus obj) => obj.s0 == s0 && obj.s1 == s1;