#include "Random.h"
#include <limits.h>

/* rand() is not fast, or random, or the same across systems. So here is RANROT-B PRNG. */

static int low = 0, high = ~0;

#define FIRST_RUN_ITERATIONS 50

void sdrand(int seed) {
  int iteration;
  
  low = seed;
  high = ~seed;
  
  for (iteration = 0; iteration < FIRST_RUN_ITERATIONS; iteration++) {
    irand();
  }
}

unsigned int uirand() {
  high = ((high << 16) + (high >> 16));
  high += low;
  low += high;
  return (high & INT_MAX);
}

int irand() {
  high = ((high << 16) + (high >> 16));
  high += low;
  low += high;
  return high;
}

float ufrand(float range) {
  return ((range * uirand()) / (float) INT_MAX);
}

float frand(float range) {
  return ((range * irand()) / (float) INT_MAX);
}