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34 lines
1.4 KiB
C
34 lines
1.4 KiB
C
#ifndef PMDSKY_DG_RANDOM_H
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#define PMDSKY_DG_RANDOM_H
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#include "util.h"
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typedef struct prng_state {
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bool8 use_secondary;
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u32 seq_num_primary;
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u32 preseed;
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u32 last_value_primary;
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s32 idx_secondary;
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} prng_state;
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void InitDungeonRng(u32 seed);
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u16 DungeonRand16Bit(void);
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// Compute a pseudorandom integer under a given maximum value using the dungeon PRNG.
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// pseudorandom integer on the interval [0, end - 1]
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s32 DungeonRandInt(s32 end);
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// Compute a pseudorandom value between two integers using the dungeon PRNG.
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// If both input integers are the same, the first is returned.
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// return: pseudorandom integer on the interval [min(from, to), max(from, to) - 1], or from if from == to.
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s32 DungeonRandRange(s32 from, s32 to);
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// Returns the result of a possibly biased coin flip (a Bernoulli random variable) with some success probability p, using the dungeon PRNG.
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// percentChance: success percentage (100*p)
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// return: true with probability p, false with probability (1-p)
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bool8 DungeonRandOutcome__022EAB20(s32 percentChance);
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// Returns the result of a possibly biased coin flip (a Bernoulli random variable) with some success probability p, using the dungeon PRNG.
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// percentChance: success percentage (100*p)
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// return: true with probability p, false with probability (1-p)
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bool8 DungeonRandOutcome__022EAB50(s32 percentChance);
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#endif //PMDSKY_DG_RANDOM_H
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