Method next

deps/opencv/modules/core/src/rand.cpp:972–1012

}

unsigned cv::RNG_MT19937::next()
{
    /* mag01[x] = x * MATRIX_A  for x=0,1 */
    static unsigned mag01[2] = { 0x0U, /*MATRIX_A*/ 0x9908b0dfU};

    const unsigned UPPER_MASK = 0x80000000U;
    const unsigned LOWER_MASK = 0x7fffffffU;

    /* generate N words at one time */
    if (mti >= N)
    {
        int kk = 0;

        for (; kk < N - M; ++kk)
        {
            unsigned y = (state[kk] & UPPER_MASK) | (state[kk + 1] & LOWER_MASK);
            state[kk] = state[kk + M] ^ (y >> 1) ^ mag01[y & 0x1U];
        }

        for (; kk < N - 1; ++kk)
        {
            unsigned y = (state[kk] & UPPER_MASK) | (state[kk + 1] & LOWER_MASK);
            state[kk] = state[kk + (M - N)] ^ (y >> 1) ^ mag01[y & 0x1U];
        }

        unsigned y = (state[N - 1] & UPPER_MASK) | (state[0] & LOWER_MASK);
        state[N - 1] = state[M - 1] ^ (y >> 1) ^ mag01[y & 0x1U];

        mti = 0;
    }

    unsigned y = state[mti++];

    /* Tempering */
    y ^= (y >> 11);
    y ^= (y <<  7) & 0x9d2c5680U;
    y ^= (y << 15) & 0xefc60000U;
    y ^= (y >> 18);

    return y;
}

cv::RNG_MT19937::operator unsigned() { return next(); }