C++ (Cpp) RNG::getInt Examples

Example #1

File: Simplex.cpp Project: ryban/Noisy

// initialize the permuations to generate 
void Simplex::initPerm()
{
    RNG rng;
    rng.setSeed(m_seed);
    // each element from 0-255 inside the permutations, no duplicates
    for(int i = 0; i < 256; i++)
        perm[i] = i;
    // shuffle the array
    for(int i = 255; i > 0; i--)
    {
        int j = rng.getInt(0, i+1); // i+1 since the rng.getInt is not inclusive
        int hold = perm[i];
        perm[i] = perm[j];
        perm[j] = hold;
    }

    // copy the array to the top half
    // uses more memory but makes things easier
    for(int i = 256; i < 512; i++)
        perm[i] = perm[i&255];
}