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Fix ruins of alph unown form check

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This commit is contained in:
Kurt 2024-03-09 23:10:01 -06:00
parent a143c9a2ab
commit 564025ae72
1 changed files with 12 additions and 14 deletions
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26
PKHeX.Core/Legality/RNG/ClassicEra/Gen4/RuinsOfAlph4.cs
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@ -64,11 +64,6 @@ public static class RuinsOfAlph4
private static bool IsFormValidInterior(byte form, uint rand)
{
// Eager-check the full set of forms, as most players will have unlocked all forms.
var full = rand % 26;
if (full == form)
return true;
// Let's have some fun: permute the combinations of unlocked forms & resulting form choice-s.
Span<byte> forms = stackalloc byte[26]; // A-Z
return Recurse(forms, form, rand, 0);
@ -86,16 +81,19 @@ public static class RuinsOfAlph4
if (Recurse(forms, form, rand, newCount, depth + 1))
return true;
// Try with the forms we added in this stack frame.
// Don't need to check the not-added case as earlier depths will check the same set when needed.
var roll = rand % newCount;
var expect = forms[(int)roll];
if (expect == form)
return true;
// Try checking without the added forms. No need to clear what we just added.
// Check this case before the nothing-else case, as players aren't likely to be missing many sets.
if (Recurse(forms, form, rand, count, depth + 1))
return true;
// Try with the forms we added in this stack frame.
// Don't need to check the not-added case as earlier depths will check the same set when needed.
var roll = rand % newCount;
var expect = forms[(int)roll];
return expect == form;
return false;
}
private static int AddForms(Span<byte> forms, int count, int depth)
@ -108,10 +106,10 @@ public static class RuinsOfAlph4
private static (byte Start, byte End) GetForms(int index) => index switch
{
0 => (00, 09), // A-J [00,09] = 10
1 => (10, 16), // K-Q [10,16] = 7
2 => (17, 21), // R-V [17,21] = 5
3 => (22, 25), // W-Z [22,25] = 4
0 => (00, 09), // A-J = 10
1 => (17, 21), // R-V = 5
2 => (10, 16), // K-Q = 7
3 => (22, 25), // W-Z = 4
_ => throw new ArgumentOutOfRangeException(nameof(index)),
};
}