| 1 |
/* |
| 2 |
* This file is part of Deliantra, the Roguelike Realtime MMORPG. |
| 3 |
* |
| 4 |
* Copyright (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team |
| 5 |
* Copyright (©) 2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
| 6 |
* |
| 7 |
* Deliantra is free software: you can redistribute it and/or modify it under |
| 8 |
* the terms of the Affero GNU General Public License as published by the |
| 9 |
* Free Software Foundation, either version 3 of the License, or (at your |
| 10 |
* option) any later version. |
| 11 |
* |
| 12 |
* This program is distributed in the hope that it will be useful, |
| 13 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 |
* GNU General Public License for more details. |
| 16 |
* |
| 17 |
* You should have received a copy of the Affero GNU General Public License |
| 18 |
* and the GNU General Public License along with this program. If not, see |
| 19 |
* <http://www.gnu.org/licenses/>. |
| 20 |
* |
| 21 |
* The authors can be reached via e-mail to <support@deliantra.net> |
| 22 |
*/ |
| 23 |
|
| 24 |
#include <cmath> |
| 25 |
|
| 26 |
#include <global.h> |
| 27 |
|
| 28 |
rand_gen rndm, rmg_rndm; |
| 29 |
|
| 30 |
ecb_noinline void |
| 31 |
tausworthe_rng::seed (uint32_t seed) |
| 32 |
{ |
| 33 |
state [0] = seed * 69069U; if (state [0] < 2U) state [0] += 2U; |
| 34 |
state [1] = state [0] * 69069U; if (state [1] < 8U) state [1] += 8U; |
| 35 |
state [2] = state [1] * 69069U; if (state [2] < 16U) state [2] += 16U; |
| 36 |
state [3] = state [2] * 69069U; if (state [3] < 128U) state [3] += 128U; |
| 37 |
|
| 38 |
for (int i = 11; --i; ) |
| 39 |
next (); |
| 40 |
} |
| 41 |
|
| 42 |
uint32_t |
| 43 |
tausworthe_rng::next () |
| 44 |
{ |
| 45 |
state [0] = ((state [0] & 0xFFFFFFFEU) << 18U) ^ (((state [0] << 6U) ^ state [0]) >> 13U); |
| 46 |
state [1] = ((state [1] & 0xFFFFFFF8U) << 2U) ^ (((state [1] << 2U) ^ state [1]) >> 27U); |
| 47 |
state [2] = ((state [2] & 0xFFFFFFF0U) << 7U) ^ (((state [2] << 13U) ^ state [2]) >> 21U); |
| 48 |
state [3] = ((state [3] & 0xFFFFFF80U) << 13U) ^ (((state [3] << 3U) ^ state [3]) >> 12U); |
| 49 |
|
| 50 |
return state [0] ^ state [1] ^ state [2] ^ state [3]; |
| 51 |
} |
| 52 |
|
| 53 |
ecb_noinline void |
| 54 |
r250521_rng::seed (uint32_t seed) |
| 55 |
{ |
| 56 |
xorshift_rng rng; |
| 57 |
|
| 58 |
rng.seed (seed); |
| 59 |
|
| 60 |
r250.seed_rng (rng); |
| 61 |
r521.seed_rng (rng); |
| 62 |
} |
| 63 |
|
| 64 |
uint32_t |
| 65 |
r250521_rng::next () |
| 66 |
{ |
| 67 |
return r250.next () ^ r521.next (); |
| 68 |
} |
| 69 |
|
| 70 |
template<class generator> |
| 71 |
uint32_t |
| 72 |
random_number_generator<generator>::get_range (uint32_t num) |
| 73 |
{ |
| 74 |
return (this->next () * (uint64_t)num) >> 32U; |
| 75 |
} |
| 76 |
|
| 77 |
template<class generator> |
| 78 |
ecb_noinline uint32_t |
| 79 |
random_number_generator<generator>::get_u32 () |
| 80 |
{ |
| 81 |
return generator::next (); |
| 82 |
} |
| 83 |
|
| 84 |
template<class generator> |
| 85 |
ecb_noinline uint64_t |
| 86 |
random_number_generator<generator>::get_u64 () |
| 87 |
{ |
| 88 |
return (uint64_t (get_u32 ()) << 32U) | get_u32 (); |
| 89 |
} |
| 90 |
|
| 91 |
template<class generator> |
| 92 |
ecb_noinline float |
| 93 |
random_number_generator<generator>::get_float () |
| 94 |
{ |
| 95 |
return this->next () / (float)0x100000000ULL; |
| 96 |
} |
| 97 |
|
| 98 |
template<class generator> |
| 99 |
ecb_noinline double |
| 100 |
random_number_generator<generator>::get_double () |
| 101 |
{ |
| 102 |
return this->next () / (double)0x100000000ULL; |
| 103 |
} |
| 104 |
|
| 105 |
// return a number within (min .. max) |
| 106 |
template<class generator> |
| 107 |
int |
| 108 |
random_number_generator<generator>::get_range (int r_min, int r_max) |
| 109 |
{ |
| 110 |
return r_min + get_range (max (r_max - r_min + 1, 0)); |
| 111 |
} |
| 112 |
|
| 113 |
template<class generator> |
| 114 |
uint32_t |
| 115 |
random_number_generator<generator>::poisson (double mean) |
| 116 |
{ |
| 117 |
double g = std::exp (-mean); |
| 118 |
uint32_t em = 0; |
| 119 |
|
| 120 |
double t = get_double (); |
| 121 |
|
| 122 |
while (t > g) |
| 123 |
{ |
| 124 |
++em; |
| 125 |
t *= get_double (); |
| 126 |
} |
| 127 |
|
| 128 |
return em; |
| 129 |
} |
| 130 |
|
| 131 |
template struct random_number_generator<bcpl_rng>; |
| 132 |
template struct random_number_generator<borosh_niederreiter_rng>; |
| 133 |
template struct random_number_generator<tausworthe_rng>; |
| 134 |
template struct random_number_generator<xorshift_rng>; |
| 135 |
template struct random_number_generator<freeciv_rng>; |
| 136 |
template struct random_number_generator<r250_rng>; |
| 137 |
template struct random_number_generator<r521_rng>; |
| 138 |
template struct random_number_generator<r250521_rng>; |
| 139 |
|
