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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "System/UnsyncedRNG.h"
#include "Sim/Misc/GlobalConstants.h"
#include <limits.h>
UnsyncedRNG::UnsyncedRNG()
: randSeed(0)
#ifdef USE_BOOST_RNG
, distInt(0, RANDINT_MAX)
, distSphere(3)
, gen01(rng, dist01)
, genInt(rng, distInt)
, genSphere(rng, distSphere)
#endif
{
}
void UnsyncedRNG::operator=(const UnsyncedRNG& urng)
{
randSeed = urng.randSeed;
Seed(randSeed);
}
void UnsyncedRNG::Seed(unsigned seed)
{
randSeed = seed;
#ifdef USE_BOOST_RNG
rng.seed(seed);
#endif
}
int UnsyncedRNG::RandInt()
{
#ifdef USE_BOOST_RNG
return genInt();
#else
randSeed = (randSeed * 214013L + 2531011L);
return (randSeed >> 16) & RANDINT_MAX;
#endif
}
float UnsyncedRNG::RandFloat()
{
#ifdef USE_BOOST_RNG
return gen01();
#else
randSeed = (randSeed * 214013L + 2531011L);
return float((randSeed >> 16) & RANDINT_MAX) / RANDINT_MAX;
#endif
}
float3 UnsyncedRNG::RandVector()
{
#ifdef USE_BOOST_RNG
float3 ret(&genSphere()[0]);
ret *= RandFloat();
#else
float3 ret;
do {
ret.x = RandFloat() * 2 - 1;
ret.y = RandFloat() * 2 - 1;
ret.z = RandFloat() * 2 - 1;
} while (ret.SqLength() > 1);
#endif
return ret;
}
float3 UnsyncedRNG::RandVector2D()
{
float3 ret;
do {
ret.x = RandFloat() * 2 - 1;
ret.z = RandFloat() * 2 - 1;
} while (ret.SqLength() > 1);
return ret;
}
int UnsyncedRNG::operator()(int n)
{
return RandInt() * n / ((INT_MAX & RANDINT_MAX) + 1); // the range of RandInt() is limited to (INT_MAX & 0x7FFF)
}
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