source/base/base_rand.cpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

#define RAND_CONSTANT 6364136223846793005
internal u64 rand_u64(u64 constant)
{
 time_t current_time = time(0);
 constant            = current_time ^ constant;

 constant += 0x9e3779b97f4a7c15;

 u64 z = constant;
 z     = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
 z     = (z ^ (z >> 27)) * 0x94d049bb133111eb;
 z     = z ^ (z >> 31);

 return z;
}

// TODO: bah i don't know if this is good