mirror of
https://github.com/kwsch/PKHeX
synced 2024-11-26 22:10:21 +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.
92 lines
3.2 KiB
C#
92 lines
3.2 KiB
C#
namespace PKHeX.Core;
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/// <summary>
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/// Generation 3 & 4 RNG logic.
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/// </summary>
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public static class ClassicEraRNG
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{
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/// <summary>
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/// Generate a chain shiny PID for the provided trainer ID.
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/// </summary>
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/// <param name="seed">Seed to use for the RNG.</param>
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/// <param name="id32">Trainer ID to use for the PID generation.</param>
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/// <returns>Shiny PID.</returns>
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/// <remarks>Consumes 15 RNG calls</remarks>
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public static uint GetChainShinyPID(ref uint seed, in uint id32)
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{
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// 1 3-bit for lower
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// 1 3-bit for upper
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// 13 rand bits
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uint lower = LCRNG.Next16(ref seed) & 7;
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uint upper = LCRNG.Next16(ref seed) & 7;
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for (int i = 3; i < 16; i++)
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lower |= (LCRNG.Next16(ref seed) & 1) << i;
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var tid16 = (ushort)(id32 & 0xFFFFu);
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var sid16 = (ushort)(id32 >> 16);
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upper = ((lower ^ tid16 ^ sid16) & 0xFFF8) | (upper & 0x7);
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return (upper << 16) | lower;
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}
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/// <summary>
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/// Rolls the RNG forward twice to get the usual Method 1 call-ordered PID.
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/// </summary>
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/// <param name="seed">Seed right before the first PID call.</param>
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/// <returns>32-bit value containing the PID (high | low).</returns>
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public static uint GetSequentialPID(ref uint seed)
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{
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var rand1 = LCRNG.Next16(ref seed);
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var rand2 = LCRNG.Next16(ref seed);
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return (rand2 << 16) | rand1;
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}
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/// <summary>
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/// Rolls the RNG forward twice to get the usual Method 1 call-ordered PID.
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/// </summary>
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/// <param name="seed">Seed right before the first PID call.</param>
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/// <returns>32-bit value containing the PID (high | low).</returns>
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public static uint GetSequentialPID(uint seed)
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{
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var rand1 = LCRNG.Next16(ref seed);
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var rand2 = LCRNG.Next16(ref seed);
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return (rand2 << 16) | rand1;
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}
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/// <summary>
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/// Rolls the RNG forward twice to get the reverse Method 1 call-ordered PID.
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/// </summary>
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/// <param name="seed">Seed right before the first PID call.</param>
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/// <remarks>Generation 3 Unown</remarks>
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/// <returns>32-bit value containing the PID (high | low).</returns>
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public static uint GetReversePID(ref uint seed)
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{
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var rand1 = LCRNG.Next16(ref seed);
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var rand2 = LCRNG.Next16(ref seed);
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return (rand2 << 16) | rand1;
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}
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/// <summary>
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/// Rolls the RNG forward twice to get the reverse Method 1 call-ordered PID.
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/// </summary>
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/// <param name="seed">Seed right before the first PID call.</param>
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/// <remarks>Generation 3 Unown</remarks>
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/// <returns>32-bit value containing the PID (high | low).</returns>
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public static uint GetReversePID(uint seed)
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{
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var rand1 = LCRNG.Next16(ref seed);
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var rand2 = LCRNG.Next16(ref seed);
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return (rand1 << 16) | rand2;
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}
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/// <summary>
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/// Generates IVs for a given seed.
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/// </summary>
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/// <param name="seed">Seed to use for the RNG.</param>
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/// <returns>32-bit value containing the IVs (HABSCD, low->high).</returns>
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public static uint GetSequentialIVs(ref uint seed)
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{
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var rand1 = LCRNG.Next16(ref seed);
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var rand2 = LCRNG.Next16(ref seed);
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return (rand2 << 15) | rand1;
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}
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}
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