m_random.c

#include <stdlib.h>
#include "m_random.h"

static const unsigned char rndtable[256] = {
    0, 8, 109, 220, 222, 241, 149, 107, 75, 248, 254, 140, 16, 66, 74, 21,
    211, 47, 80, 242, 154, 27, 205, 128, 161, 89, 77, 36, 95, 110, 85, 48,
    212, 140, 211, 249, 22, 79, 200, 50, 28, 188, 52, 140, 202, 120, 68, 145,
    62, 70, 184, 190, 91, 197, 152, 224, 149, 104, 25, 178, 252, 182, 202, 182,
    141, 197, 4, 81, 181, 242, 145, 42, 39, 227, 156, 198, 225, 193, 219, 93,
    122, 175, 249, 0, 175, 143, 70, 239, 46, 246, 163, 53, 163, 109, 168, 135,
    2, 235, 25, 92, 20, 145, 138, 77, 69, 166, 78, 176, 173, 212, 166, 113,
    94, 161, 41, 50, 239, 49, 111, 164, 70, 60, 2, 37, 171, 75, 136, 156,
    11, 56, 42, 146, 138, 229, 73, 146, 77, 61, 98, 196, 135, 106, 63, 197,
    195, 86, 96, 203, 113, 101, 170, 247, 181, 113, 80, 250, 108, 7, 255, 237,
    129, 226, 79, 107, 112, 166, 103, 241, 24, 223, 239, 120, 198, 58, 60, 82,
    128, 3, 184, 66, 143, 224, 145, 224, 81, 206, 163, 45, 63, 90, 168, 114,
    59, 33, 159, 95, 28, 139, 123, 98, 125, 196, 15, 70, 194, 253, 54, 14,
    109, 226, 71, 17, 161, 93, 186, 87, 244, 138, 20, 52, 123, 251, 26, 36,
    17, 46, 52, 231, 232, 76, 31, 221, 84, 37, 216, 165, 212, 106, 197, 242,
    98, 43, 39, 175, 254, 145, 190, 84, 118, 222, 187, 136, 120, 163, 236, 249
};

rng_t rng;

int P_Random(pr_class_t pr_class)
{

    unsigned long boom;

    if (pr_class != pr_misc)
        pr_class = pr_all_in_one;

    boom = rng.seed[pr_class];
    rng.seed[pr_class] = boom * 1664525ul + 221297ul + pr_class * 2;
    boom >>= 20;

    return boom & 255;

}

void M_ClearRandom(unsigned long rngseed)
{

    int i;
    unsigned long seed = rngseed * 2 + 1;

    for (i = 0; i < NUMPRCLASS; i++)
        rng.seed[i] = seed *= 69069ul;

    rng.prndindex = rng.rndindex = 0;

}