161a499c76
git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@14865 54d463be-8e91-2dee-dedb-b68131a5f0ec
84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
// Copyright (c) Athena Dev Teams - Licensed under GNU GPL
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// For more information, see LICENCE in the main folder
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#include "../common/timer.h" // gettick
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#include "random.h"
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#if defined(WIN32)
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#elif defined(HAVE_GETPID) || defined(HAVE_GETTID)
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#include <sys/types.h>
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#include <unistd.h>
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#endif
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#include <time.h> // time
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#include <mt19937ar.h> // init_genrand, genrand_int32, genrand_res53
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/// Initializes the random number generator with an appropriate seed.
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void rnd_init(void)
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{
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uint32 seed = gettick();
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seed += (uint32)time(NULL);
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#if defined(WIN32)
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seed += GetCurrentProcessId();
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seed += GetCurrentThreadId();
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#else
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#if defined(HAVE_GETPID)
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seed += (uint32)getpid();
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#endif // HAVE_GETPID
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#if defined(HAVE_GETTID)
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seed += (uint32)gettid();
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#endif // HAVE_GETTID
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#endif
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init_genrand(seed);
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}
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/// Initializes the random number generator.
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void rnd_seed(uint32 seed)
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{
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init_genrand(seed);
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}
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/// Generates a random number in the interval [0, UINT32_MAX]
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uint32 rnd(void)
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{
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return (uint32)genrand_int32();
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}
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/// Generates a random number in the interval [0, dice_faces)
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/// NOTE: interval is open ended, so dice_faces is excluded (unless it's 0)
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uint32 rnd_roll(uint32 dice_faces)
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{
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return (uint32)(rnd_uniform()*dice_faces);
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}
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/// Generates a random number in the interval [min, max]
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/// Returns min if range is invalid.
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int32 rnd_value(int32 min, int32 max)
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{
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if( min >= max )
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return min;
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return min + (int32)(rnd_uniform()*(max-min+1));
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}
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/// Generates a random number in the interval [0.0, 1.0)
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/// NOTE: interval is open ended, so 1.0 is excluded
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double rnd_uniform(void)
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{
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return ((uint32)genrand_int32())*(1.0/4294967296.0);// divided by 2^32
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}
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/// Generates a random number in the interval [0.0, 1.0) with 53-bit resolution
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/// NOTE: interval is open ended, so 1.0 is excluded
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/// NOTE: 53 bits is the maximum precision of a double
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double rnd_uniform53(void)
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{
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return genrand_res53();
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}
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