private static bool GetIsHeightWeightMatch(PKM pk, Xoroshiro128Plus8b xoro)
{
// Check height/weight
if (pk is not IScaledSize s)
{
return(false);
}
var height = xoro.NextUInt(0x81) + xoro.NextUInt(0x80);
var weight = xoro.NextUInt(0x81) + xoro.NextUInt(0x80);
return(s.HeightScalar == height && s.WeightScalar == weight);
}
private static bool GetIsMatchEndWithCuteCharm(PKM pk, Xoroshiro128Plus8b xoro)
{
// Check that gender matches
// Assume that the gender is a match due to cute charm.
// Check that the nature matches
if (pk.Nature != (int)xoro.NextUInt(25))
{
return(false);
}
return(GetIsHeightWeightMatch(pk, xoro));
}
private static int GetFramesForward(ulong s0, ulong s1, ulong n0, ulong n1, int loop)
{
var rand = new Xoroshiro128Plus8b(s0, s1);
for (int i = 0; i < loop; i++)
{
_ = rand.Next();
if (rand.GetState() == (n0, n1))
{
return(i);
}
}
return(-1);
}
private static bool GetIsMatchEnd(PKM pk, Xoroshiro128Plus8b xoro)
{
// Check that gender matches
var genderRatio = PersonalTable.BDSP.GetFormEntry(pk.Species, pk.Form).Gender;
if (genderRatio == PersonalInfo.RatioMagicGenderless)
{
if (pk.Gender != (int)Gender.Genderless)
{
return(false);
}
}
else if (genderRatio == PersonalInfo.RatioMagicMale)
{
if (pk.Gender != (int)Gender.Male)
{
return(false);
}
}
else if (genderRatio == PersonalInfo.RatioMagicFemale)
{
if (pk.Gender != (int)Gender.Female)
{
return(false);
}
}
else
{
if (pk.Gender != (((int)xoro.NextUInt(253) + 1 < genderRatio) ? 1 : 0))
{
return(false);
}
}
// Check that the nature matches
if (pk.Nature != (int)xoro.NextUInt(25))
{
return(false);
}
return(GetIsHeightWeightMatch(pk, xoro));
}
private static bool TryApplyFromSeed(PKM pk, EncounterCriteria criteria, Shiny shiny, int flawless, uint seed)
{
var xoro = new Xoroshiro128Plus8b(seed);
// Encryption Constant
pk.EncryptionConstant = seed;
// PID
var fakeTID = xoro.NextUInt(); // fakeTID
var pid = xoro.NextUInt();
pid = GetRevisedPID(fakeTID, pid, pk);
if (shiny == Shiny.Never)
{
if (GetIsShiny(pk.TID, pk.SID, pid))
{
return(false);
}
}
else if (shiny != Shiny.Random)
{
if (!GetIsShiny(pk.TID, pk.SID, pid))
{
return(false);
}
if (shiny == Shiny.AlwaysSquare && pk.ShinyXor != 0)
{
return(false);
}
if (shiny == Shiny.AlwaysStar && pk.ShinyXor == 0)
{
return(false);
}
}
pk.PID = pid;
// Check IVs: Create flawless IVs at random indexes, then the random IVs for not flawless.
Span <int> ivs = stackalloc [] { UNSET, UNSET, UNSET, UNSET, UNSET, UNSET };
const int MAX = 31;
var determined = 0;
while (determined < flawless)
{
var idx = (int)xoro.NextUInt(6);
if (ivs[idx] != UNSET)
{
continue;
}
ivs[idx] = 31;
determined++;
}
for (var i = 0; i < ivs.Length; i++)
{
if (ivs[i] == UNSET)
{
ivs[i] = (int)xoro.NextUInt(MAX + 1);
}
}
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];
// Ability
pk.SetAbilityIndex((int)xoro.NextUInt(2));
// Remainder
var scale = (IScaledSize)pk;
scale.HeightScalar = (byte)((int)xoro.NextUInt(0x81) + (int)xoro.NextUInt(0x80));
scale.WeightScalar = (byte)((int)xoro.NextUInt(0x81) + (int)xoro.NextUInt(0x80));
return(true);
}
public static bool ValidateRoamingEncounter(PKM pk, Shiny shiny = Shiny.Random, int flawless = 0)
{
var seed = pk.EncryptionConstant;
if (seed == int.MaxValue)
{
return(false); // Unity's Rand is [int.MinValue, int.MaxValue)
}
var xoro = new Xoroshiro128Plus8b(seed);
// Check PID
var fakeTID = xoro.NextUInt(); // fakeTID
var pid = xoro.NextUInt();
pid = GetRevisedPID(fakeTID, pid, pk);
if (pk.PID != pid)
{
return(false);
}
// Check IVs: Create flawless IVs at random indexes, then the random IVs for not flawless.
Span <int> ivs = stackalloc [] { UNSET, UNSET, UNSET, UNSET, UNSET, UNSET };
var determined = 0;
while (determined < flawless)
{
var idx = (int)xoro.NextUInt(6);
if (ivs[idx] != UNSET)
{
continue;
}
ivs[idx] = 31;
determined++;
}
for (var i = 0; i < ivs.Length; i++)
{
if (ivs[i] == UNSET)
{
ivs[i] = (int)xoro.NextUInt(31 + 1);
}
}
if (ivs[0] != pk.IV_HP)
{
return(false);
}
if (ivs[1] != pk.IV_ATK)
{
return(false);
}
if (ivs[2] != pk.IV_DEF)
{
return(false);
}
if (ivs[3] != pk.IV_SPA)
{
return(false);
}
if (ivs[4] != pk.IV_SPD)
{
return(false);
}
if (ivs[5] != pk.IV_SPE)
{
return(false);
}
// Don't check Hidden ability, as roaming encounters are 1/2 only.
if (pk.AbilityNumber != (1 << (int)xoro.NextUInt(2)))
{
return(false);
}
return(GetIsMatchEnd(pk, xoro) || GetIsMatchEndWithCuteCharm(pk, xoro) || GetIsMatchEndWithSynchronize(pk, xoro));
}