pa/eqemu-server
2
0
Fork 0
mirror of https://github.com/EQEmu/Server.git synced 2026-09-04 22:56:37 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add some knobs to our RNG class

Browse Source 
Also included is an additive lagged fibonacci generator that should is
very similar to EQ's. Also added BIASED_INT_DIST in case someone wants
to use "bad" int distribution to more closely match EQ as well.

An option to set a custom engine (just in case people would like to play
with other std engines) is available.

There is also support for GCC's SIMD accelerated extension to std random
engines.

All these options are hidden behind advanced options in CMake since
they're rather advanced knobs.
This commit is contained in:
Michael Cook (mackal)
2021-07-16 21:50:46 -04:00
parent 8a2a1b152e
commit ddb14187b0
4 changed files with 228 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
common/random.h
+39 -7
View File
@@ -1,5 +1,5 @@
/* EQEMu: Everquest Server Emulator
Copyright (C) 2001-2014 EQEMu Development Team (http://eqemulator.net)
Copyright (C) 2001-2021 EQEMu Development Team (http://eqemulator.net)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -25,10 +25,24 @@
#include <iterator>
#include <type_traits>
/* This uses mt19937 seeded with the std::random_device
* The idea is to have this be included as a member of another class
* so mocking out for testing is easier
* If you need to reseed random.Reseed()
#ifdef USE_SFMT19937
// only GCC supports, so lets turn it off
#ifndef __GNUC__
#undef USE_SFMT19937
#endif
#ifdef __clang__
#undef USE_SFMT19937
#endif
#endif
#ifdef USE_ADDITIVE_LFIB_PRNG
#include "additive_lagged_fibonacci_engine.h"
#elif defined(USE_SFMT19937)
#include <ext/random>
#endif
/* This uses mt19937 (or other compatible engine) seeded with the std::random_device. The idea is to have this be
* included as a member of another class so mocking out for testing is easier If you need to reseed random.Reseed()
* Eventually this should be derived from an abstract base class
*/
@@ -40,7 +54,12 @@ namespace EQ {
{
if (low > high)
std::swap(low, high);
// EQ uses biased int distribution, so I guess we can support it :P
#ifdef BIASED_INT_DIST
return low + m_gen() % (high - low + 1);
#else
return int_dist(m_gen, int_param_t(low, high)); // [low, high]
#endif
}
// AKA old MakeRandomFloat
@@ -98,11 +117,24 @@ namespace EQ {
}
private:
#ifndef BIASED_INT_DIST
typedef std::uniform_int_distribution<int>::param_type int_param_t;
typedef std::uniform_real_distribution<double>::param_type real_param_t;
std::mt19937 m_gen;
std::uniform_int_distribution<int> int_dist;
#endif
typedef std::uniform_real_distribution<double>::param_type real_param_t;
std::uniform_real_distribution<double> real_dist;
// define USE_CUSTOM_PRNG_ENGINE to any supported random engine like:
// #define USE_CUSTOM_PRNG_ENGINE std::default_random_engine
#ifdef USE_ADDITIVE_LFIB_PRNG
EQRand
#elif defined(USE_SFMT19937)
__gnu_cxx::sfmt19937
#elif defined(USE_CUSTOM_PRNG_ENGINE)
USE_CUSTOM_PRNG_ENGINE
#else
std::mt19937
#endif
m_gen;
};
}