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#include <math.h>
#include "math.h"
#include "random.h"
namespace JinEngine
{
namespace Math
{
RandomGenerator::RandomGenerator(uint32 seed)
: mSeed(seed)
{
}
uint32 RandomGenerator::rand()
{
unsigned int next = mSeed;
uint32 result;
next *= 1103515245;
next += 12345;
result = (unsigned int)(next / 65536) % 2048;
next *= 1103515245;
next += 12345;
result <<= 10;
result ^= (unsigned int)(next / 65536) % 1024;
next *= 1103515245;
next += 12345;
result <<= 10;
result ^= (unsigned int)(next / 65536) % 1024;
mSeed = next;
return result;
}
uint32 RandomGenerator::rand(uint32 min, uint32 max)
{
uint32 n = rand();
return n % (max - min + 1) + min;
}
float RandomGenerator::randf(float min, float max, int ac)
{
float floor = 0, ceil = max + reverse<float>(min);
uint32 a = pow(10.f, ac);
uint32 n = rand(floor*a, ceil*a);
return (float)n / a + min;
}
}
}
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