pokeemerald/src/random.c

#include "global.h"
#include "random.h"

// The number 1103515245 comes from the example implementation of rand and srand
// in the ISO C standard.

EWRAM_DATA static u8 sUnknown = 0;
EWRAM_DATA static u32 sRandCount = 0;

// IWRAM common
IWRAM_DATA u32 gRngValue;
IWRAM_DATA u32 gRng2Value;

u16 Random(void)
{
    gRngValue = 1103515245 * gRngValue + 24691;
    sRandCount++;
    return gRngValue >> 16;
}

void SeedRng(u16 seed)
{
    gRngValue = seed;
    sUnknown = 0;
}

void SeedRng2(u16 seed)
{
    gRng2Value = seed;
}

u16 Random2(void)
{
    gRng2Value = 1103515245 * gRng2Value + 24691;
    return gRng2Value >> 16;
}