mirror of
https://github.com/kwsch/PKHeX
synced 2024-09-20 22:32:00 +00:00
95fbf66a6e
In addition to the Method 1 (and other sibling PIDIV types) correlation, an encounter can only be triggered if the calls prior land on the Method {1} seed. The RNG community has dubbed these patterns as "Method J" (D/P/Pt), "Method K" (HG/SS), and "Method H" (Gen3, coined by yours truly). The basic gist of these is that they are pre-requisites, like the Shadow locks of Colosseum/XD.
Rename/re-type a bunch of properties to get the codebase more in line with correct property names & more obvious underlying types.
334 lines
10 KiB
C#
334 lines
10 KiB
C#
using System;
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namespace PKHeX.Core;
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/// <summary>
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/// Contains a collection of methods that mutate the input Pokémon object, usually to obtain a <see cref="PIDType"/> correlation.
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/// </summary>
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public static class PIDGenerator
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{
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private static void SetValuesFromSeedLCRNG(PKM pk, PIDType type, uint seed)
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{
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var A = LCRNG.Next(seed);
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var B = LCRNG.Next(A);
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var skipBetweenPID = type is PIDType.Method_3 or PIDType.Method_3_Unown;
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if (skipBetweenPID) // VBlank skip between PID rand() [RARE]
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B = LCRNG.Next(B);
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var swappedPIDHalves = type is >= PIDType.Method_1_Unown and <= PIDType.Method_4_Unown;
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if (swappedPIDHalves) // switched order of PID halves, "BA**"
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pk.PID = (A & 0xFFFF0000) | (B >> 16);
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else
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pk.PID = (B & 0xFFFF0000) | (A >> 16);
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var C = LCRNG.Next(B);
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var skipIV1Frame = type is PIDType.Method_2 or PIDType.Method_2_Unown;
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if (skipIV1Frame) // VBlank skip after PID
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C = LCRNG.Next(C);
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var D = LCRNG.Next(C);
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var skipIV2Frame = type is PIDType.Method_4 or PIDType.Method_4_Unown;
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if (skipIV2Frame) // VBlank skip between IVs
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D = LCRNG.Next(D);
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Span<int> IVs = stackalloc int[6];
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MethodFinder.GetIVsInt32(IVs, C >> 16, D >> 16);
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if (type == PIDType.Method_1_Roamer)
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{
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// Only store lowest 8 bits of IV data; zero out the other bits.
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IVs[1] &= 7;
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for (int i = 2; i < 6; i++)
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IVs[i] = 0;
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}
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pk.SetIVs(IVs);
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}
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private static void SetValuesFromSeedBACD(PKM pk, PIDType type, uint seed)
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{
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bool shiny = type is PIDType.BACD_R_S or PIDType.BACD_U_S;
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uint X = shiny ? LCRNG.Next(seed) : seed;
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var A = LCRNG.Next(X);
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var B = LCRNG.Next(A);
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var C = LCRNG.Next(B);
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var D = LCRNG.Next(C);
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if (shiny)
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{
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uint PID = (X & 0xFFFF0000) | ((X >> 16) ^ pk.TID16 ^ pk.SID16);
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PID &= 0xFFFFFFF8;
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PID |= (B >> 16) & 0x7; // lowest 3 bits
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pk.PID = PID;
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}
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else if (type is PIDType.BACD_R_AX or PIDType.BACD_U_AX)
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{
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uint low = B >> 16;
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pk.PID = ((A & 0xFFFF0000) ^ ((low ^ pk.TID16 ^ pk.SID16) << 16)) | low;
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}
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else
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{
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pk.PID = (A & 0xFFFF0000) | (B >> 16);
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}
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Span<int> IVs = stackalloc int[6];
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MethodFinder.GetIVsInt32(IVs, C >> 16, D >> 16);
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pk.SetIVs(IVs);
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bool antishiny = type is PIDType.BACD_R_A or PIDType.BACD_U_A;
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while (antishiny && pk.IsShiny)
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pk.PID = unchecked(pk.PID + 1);
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}
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private static void SetValuesFromSeedXDRNG(PKM pk, uint seed)
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{
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var species = pk.Species;
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switch (species)
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{
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case (int)Species.Umbreon or (int)Species.Eevee: // Colo Umbreon, XD Eevee
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pk.TID16 = (ushort)XDRNG.Next16(ref seed);
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pk.SID16 = (ushort)XDRNG.Next16(ref seed);
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seed = XDRNG.Next2(seed); // fake PID
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break;
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case (int)Species.Espeon: // Colo Espeon
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var tid = pk.TID16 = (ushort)XDRNG.Next16(ref seed);
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var sid = pk.SID16 = (ushort)XDRNG.Next16(ref seed);
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LockFinder.SkipValidColoStarter(ref seed, tid, sid);
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seed = XDRNG.Next2(seed); // fake PID
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break;
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}
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var A = XDRNG.Next(seed); // IV1
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var B = XDRNG.Next(A); // IV2
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var C = XDRNG.Next(B); // Ability
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if (species is (int)Species.Umbreon or (int)Species.Espeon)
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{
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// Reuse existing logic.
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pk.PID = LockFinder.GenerateStarterPID(ref C, pk.TID16, pk.SID16);
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}
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else
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{
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// Generate PID.
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var D = XDRNG.Next(C); // PID
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var E = XDRNG.Next(D); // PID
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pk.PID = (D & 0xFFFF0000) | (E >> 16);
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}
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Span<int> IVs = stackalloc int[6];
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MethodFinder.GetIVsInt32(IVs, A >> 16, B >> 16);
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pk.SetIVs(IVs);
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}
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public static void SetValuesFromSeedXDRNG_EReader(PKM pk, uint seed)
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{
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var D = XDRNG.Prev3(seed); // PID
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var E = XDRNG.Next(D); // PID
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pk.PID = (D & 0xFFFF0000) | (E >> 16);
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}
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private static void SetValuesFromSeedChannel(PKM pk, uint seed)
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{
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var O = XDRNG.Next(seed); // SID16
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var A = XDRNG.Next(O); // PID
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var B = XDRNG.Next(A); // PID
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var C = XDRNG.Next(B); // Held Item
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var D = XDRNG.Next(C); // Version
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var E = XDRNG.Next(D); // OT Gender
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const ushort TID16 = 40122;
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pk.ID32 = (O & 0xFFFF0000) | TID16;
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var SID16 = O >> 16;
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var pid1 = A >> 16;
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var pid2 = B >> 16;
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var pid = (pid1 << 16) | pid2;
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if ((pid2 > 7 ? 0 : 1) != (pid1 ^ SID16 ^ TID16))
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pid ^= 0x80000000;
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pk.PID = pid;
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pk.HeldItem = (ushort)(C >> 31) + 169; // 0-Ganlon, 1-Salac
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pk.Version = GameVersion.S + (byte)(D >> 31); // 0-Sapphire, 1-Ruby
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pk.OriginalTrainerGender = (byte)(E >> 31);
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Span<int> ivs = stackalloc int[6];
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XDRNG.GetSequentialIVsInt32(E, ivs);
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pk.SetIVs(ivs);
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}
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public static void SetValuesFromSeed(PKM pk, PIDType type, uint seed)
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{
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var method = GetGeneratorMethod(type);
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method(pk, seed);
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}
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private static Action<PKM, uint> GetGeneratorMethod(PIDType t)
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{
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switch (t)
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{
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case PIDType.Channel:
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return SetValuesFromSeedChannel;
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case PIDType.CXD:
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return SetValuesFromSeedXDRNG;
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case PIDType.Method_1 or PIDType.Method_2 or PIDType.Method_3 or PIDType.Method_4:
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case PIDType.Method_1_Unown or PIDType.Method_2_Unown or PIDType.Method_3_Unown or PIDType.Method_4_Unown:
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case PIDType.Method_1_Roamer:
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return (pk, seed) => SetValuesFromSeedLCRNG(pk, t, seed);
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case PIDType.BACD_R:
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case PIDType.BACD_R_A:
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case PIDType.BACD_R_S:
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case PIDType.BACD_R_AX:
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return (pk, seed) => SetValuesFromSeedBACD(pk, t, seed & 0xFFFF);
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case PIDType.BACD_U:
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case PIDType.BACD_U_A:
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case PIDType.BACD_U_S:
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case PIDType.BACD_U_AX:
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return (pk, seed) => SetValuesFromSeedBACD(pk, t, seed);
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case PIDType.PokeSpot:
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return SetRandomPokeSpotPID;
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case PIDType.G5MGShiny:
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return SetValuesFromSeedMG5Shiny;
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case PIDType.Pokewalker:
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return (pk, seed) =>
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{
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var pid = pk.PID = PokewalkerRNG.GetPID(pk.TID16, pk.SID16, seed % 24, pk.Gender, pk.PersonalInfo.Gender);
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pk.RefreshAbility((int)(pid & 1));
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};
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// others: unimplemented
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case PIDType.CuteCharm:
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break;
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case PIDType.ChainShiny:
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return SetRandomChainShinyPID;
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case PIDType.G4MGAntiShiny:
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break;
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}
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return (_, _) => { };
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}
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public static void SetRandomChainShinyPID(PKM pk, uint seed)
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{
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pk.PID = ClassicEraRNG.GetChainShinyPID(ref seed, pk.ID32);
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Span<int> IVs = stackalloc int[6];
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var rand1 = LCRNG.Next16(ref seed);
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var rand2 = LCRNG.Next16(ref seed);
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MethodFinder.GetIVsInt32(IVs, rand1, rand2);
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pk.SetIVs(IVs);
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}
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private static void SetRandomPokeSpotPID(PKM pk, uint seed)
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{
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var D = XDRNG.Next(seed); // PID
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var E = XDRNG.Next(D); // PID
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pk.PID = (D & 0xFFFF0000) | (E >> 16);
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}
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public static void SetRandomPokeSpotPID(PKM pk, Nature nature, byte gender, int ability, int slot)
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{
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var rnd = Util.Rand;
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while (true)
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{
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var seed = rnd.Rand32();
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if (!MethodFinder.IsPokeSpotActivation(slot, seed, out var newSeed))
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continue;
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SetRandomPokeSpotPID(pk, newSeed);
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pk.SetRandomIVs();
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if (!IsValidCriteria4(pk, nature, ability, gender))
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continue;
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return;
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}
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}
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public static uint GetMG5ShinyPID(uint gval, uint av, ushort TID16, ushort SID16)
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{
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uint PID = ((gval ^ TID16 ^ SID16) << 16) | gval;
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if ((PID & 0x10000) != av << 16)
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PID ^= 0x10000;
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return PID;
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}
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public static void SetValuesFromSeedMG5Shiny(PKM pk, uint seed)
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{
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var gv = seed >> 24;
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var av = seed & 1; // arbitrary choice
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pk.PID = GetMG5ShinyPID(gv, av, pk.TID16, pk.SID16);
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SetRandomIVs(pk);
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}
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public static uint SetRandomWildPID4(PKM pk, Nature nature, int ability, byte gender, PIDType type)
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{
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pk.RefreshAbility(ability);
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pk.Gender = gender;
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var method = GetGeneratorMethod(type);
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var rnd = Util.Rand;
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while (true)
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{
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var seed = rnd.Rand32();
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method(pk, seed);
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if (!IsValidCriteria4(pk, nature, ability, gender))
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continue;
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return seed;
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}
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}
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public static bool IsValidCriteria4(PKM pk, Nature nature, int ability, byte gender)
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{
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if (pk.GetSaneGender() != gender)
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return false;
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if (pk.Nature != nature)
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return false;
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if ((pk.EncryptionConstant & 1) != ability)
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return false;
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return true;
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}
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public static void SetRandomWildPID5(PKM pk, Nature nature, int ability, byte gender, PIDType specific = PIDType.None)
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{
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var tidbit = (pk.TID16 ^ pk.SID16) & 1;
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pk.RefreshAbility(ability);
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pk.Gender = gender;
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pk.Nature = nature;
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if (ability == 2)
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ability = 0;
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var rnd = Util.Rand;
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while (true)
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{
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uint seed = rnd.Rand32();
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if (specific == PIDType.G5MGShiny)
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{
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SetValuesFromSeedMG5Shiny(pk, seed);
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seed = pk.PID;
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}
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else
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{
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var bitxor = (seed >> 31) ^ (seed & 1);
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if (bitxor != tidbit)
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seed ^= 1;
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}
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if (((seed >> 16) & 1) != ability)
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continue;
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pk.PID = seed;
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if (pk.GetSaneGender() != gender)
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continue;
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return;
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}
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}
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private static void SetRandomIVs(PKM pk)
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{
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pk.SetRandomIVs();
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}
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}
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