| 1 |
/* |
| 2 |
* This file is part of Deliantra, the Roguelike Realtime MMORPG. |
| 3 |
* |
| 4 |
* Copyright (©) 2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
| 5 |
* |
| 6 |
* Deliantra is free software: you can redistribute it and/or modify it under |
| 7 |
* the terms of the Affero GNU General Public License as published by the |
| 8 |
* Free Software Foundation, either version 3 of the License, or (at your |
| 9 |
* option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the Affero GNU General Public License |
| 17 |
* and the GNU General Public License along with this program. If not, see |
| 18 |
* <http://www.gnu.org/licenses/>. |
| 19 |
* |
| 20 |
* The authors can be reached via e-mail to <support@deliantra.net> |
| 21 |
*/ |
| 22 |
|
| 23 |
#include <global.h> |
| 24 |
|
| 25 |
rand_gen rndm, rmg_rndm; |
| 26 |
|
| 27 |
void noinline |
| 28 |
tausworthe_random_generator::seed (uint32_t seed) |
| 29 |
{ |
| 30 |
state [0] = seed * 69069U; if (state [0] < 2U) state [0] += 2U; |
| 31 |
state [1] = state [0] * 69069U; if (state [1] < 8U) state [1] += 8U; |
| 32 |
state [2] = state [1] * 69069U; if (state [2] < 16U) state [2] += 16U; |
| 33 |
state [3] = state [2] * 69069U; if (state [3] < 128U) state [3] += 128U; |
| 34 |
|
| 35 |
for (int i = 11; --i; ) |
| 36 |
next (); |
| 37 |
} |
| 38 |
|
| 39 |
uint32_t |
| 40 |
tausworthe_random_generator::next () |
| 41 |
{ |
| 42 |
state [0] = ((state [0] & 0xFFFFFFFEU) << 18U) ^ (((state [0] << 6U) ^ state [0]) >> 13U); |
| 43 |
state [1] = ((state [1] & 0xFFFFFFF8U) << 2U) ^ (((state [1] << 2U) ^ state [1]) >> 27U); |
| 44 |
state [2] = ((state [2] & 0xFFFFFFF0U) << 7U) ^ (((state [2] << 13U) ^ state [2]) >> 21U); |
| 45 |
state [3] = ((state [3] & 0xFFFFFF80U) << 13U) ^ (((state [3] << 3U) ^ state [3]) >> 12U); |
| 46 |
|
| 47 |
return state [0] ^ state [1] ^ state [2] ^ state [3]; |
| 48 |
} |
| 49 |
|
| 50 |
void noinline |
| 51 |
r250521_random_generator::seed (uint32_t seed) |
| 52 |
{ |
| 53 |
xorshift_random_generator rng; |
| 54 |
|
| 55 |
rng.seed (seed); |
| 56 |
|
| 57 |
r250.seed_rng (rng); |
| 58 |
r521.seed_rng (rng); |
| 59 |
} |
| 60 |
|
| 61 |
uint32_t |
| 62 |
r250521_random_generator::next () |
| 63 |
{ |
| 64 |
return r250.next () ^ r521.next (); |
| 65 |
} |
| 66 |
|
| 67 |
template<class generator> |
| 68 |
uint32_t |
| 69 |
random_number_generator<generator>::get_range (uint32_t num) |
| 70 |
{ |
| 71 |
return (this->next () * (uint64_t)num) >> 32U; |
| 72 |
} |
| 73 |
|
| 74 |
template<class generator> |
| 75 |
uint32_t noinline |
| 76 |
random_number_generator<generator>::get_u32 () |
| 77 |
{ |
| 78 |
return generator::next (); |
| 79 |
} |
| 80 |
|
| 81 |
template<class generator> |
| 82 |
uint64_t noinline |
| 83 |
random_number_generator<generator>::get_u64 () |
| 84 |
{ |
| 85 |
return (uint64_t (get_u32 ()) << 32U) | get_u32 (); |
| 86 |
} |
| 87 |
|
| 88 |
// return a number within (min .. max) |
| 89 |
template<class generator> |
| 90 |
int |
| 91 |
random_number_generator<generator>::get_range (int r_min, int r_max) |
| 92 |
{ |
| 93 |
return r_min + get_range (max (r_max - r_min + 1, 0)); |
| 94 |
} |
| 95 |
|
| 96 |
template struct random_number_generator<tausworthe_random_generator>; |
| 97 |
template struct random_number_generator<xorshift_random_generator>; |
| 98 |
template struct random_number_generator<freeciv_random_generator>; |
| 99 |
template struct random_number_generator<r250_random_generator>; |
| 100 |
template struct random_number_generator<r521_random_generator>; |
| 101 |
template struct random_number_generator<r250521_random_generator>; |
| 102 |
|
