1 | /* |
1 | /* |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
3 | * |
3 | * |
4 | * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
4 | * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
5 | * |
5 | * |
6 | * Deliantra is free software: you can redistribute it and/or modify |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
7 | * it under the terms of the GNU General Public License as published by |
7 | * the terms of the Affero GNU General Public License as published by the |
8 | * the Free Software Foundation, either version 3 of the License, or |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
9 | * (at your option) any later version. |
9 | * option) any later version. |
10 | * |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
14 | * GNU General Public License for more details. |
15 | * |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
16 | * You should have received a copy of the Affero GNU General Public License |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
17 | * and the GNU General Public License along with this program. If not, see |
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18 | * <http://www.gnu.org/licenses/>. |
18 | * |
19 | * |
19 | * The authors can be reached via e-mail to <support@deliantra.net> |
20 | * The authors can be reached via e-mail to <support@deliantra.net> |
20 | */ |
21 | */ |
21 | |
22 | |
22 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
23 | #define UTIL_H__ |
24 | #define UTIL_H__ |
24 | |
25 | |
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26 | #include <compiler.h> |
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27 | |
25 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
28 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
26 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
29 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
27 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
30 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
28 | |
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29 | #if __GNUC__ >= 3 |
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30 | # define is_constant(c) __builtin_constant_p (c) |
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31 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
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32 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
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33 | #else |
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34 | # define is_constant(c) 0 |
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35 | # define expect(expr,value) (expr) |
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36 | # define prefetch(addr,rw,locality) |
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37 | #endif |
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38 | |
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39 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
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40 | # define decltype(x) typeof(x) |
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41 | #endif |
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42 | |
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43 | // put into ifs if you are very sure that the expression |
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44 | // is mostly true or mosty false. note that these return |
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45 | // booleans, not the expression. |
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46 | #define expect_false(expr) expect ((expr) != 0, 0) |
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47 | #define expect_true(expr) expect ((expr) != 0, 1) |
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48 | |
31 | |
49 | #include <pthread.h> |
32 | #include <pthread.h> |
50 | |
33 | |
51 | #include <cstddef> |
34 | #include <cstddef> |
52 | #include <cmath> |
35 | #include <cmath> |
… | |
… | |
72 | #endif |
55 | #endif |
73 | |
56 | |
74 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
57 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
75 | #define auto(var,expr) decltype(expr) var = (expr) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
76 | |
59 | |
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60 | #if cplusplus_does_not_suck |
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61 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
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62 | template<typename T, int N> |
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63 | static inline int array_length (const T (&arr)[N]) |
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64 | { |
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65 | return N; |
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66 | } |
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67 | #else |
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68 | #define array_length(name) (sizeof (name) / sizeof (name [0])) |
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69 | #endif |
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70 | |
77 | // very ugly macro that basicaly declares and initialises a variable |
71 | // very ugly macro that basically declares and initialises a variable |
78 | // that is in scope for the next statement only |
72 | // that is in scope for the next statement only |
79 | // works only for stuff that can be assigned 0 and converts to false |
73 | // works only for stuff that can be assigned 0 and converts to false |
80 | // (note: works great for pointers) |
74 | // (note: works great for pointers) |
81 | // most ugly macro I ever wrote |
75 | // most ugly macro I ever wrote |
82 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
76 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
… | |
… | |
96 | // as a is often a constant while b is the variable. it is still a bug, though. |
90 | // as a is often a constant while b is the variable. it is still a bug, though. |
97 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
91 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
98 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
92 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
99 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
93 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
100 | |
94 | |
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95 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
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96 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
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97 | template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); } |
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98 | |
101 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
99 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
102 | |
100 | |
103 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
101 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
104 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
102 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
105 | |
103 | |
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104 | // sign returns -1 or +1 |
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105 | template<typename T> |
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106 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
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107 | // relies on 2c representation |
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108 | template<> |
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109 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
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110 | template<> |
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111 | inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); } |
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112 | template<> |
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113 | inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); } |
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114 | |
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115 | // sign0 returns -1, 0 or +1 |
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116 | template<typename T> |
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117 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
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118 | |
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119 | template<typename T, typename U> |
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120 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
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121 | |
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122 | // div* only work correctly for div > 0 |
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123 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
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124 | template<typename T> static inline T div (T val, T div) |
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125 | { |
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126 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
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127 | } |
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128 | |
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129 | template<> inline float div (float val, float div) { return val / div; } |
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130 | template<> inline double div (double val, double div) { return val / div; } |
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131 | |
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132 | // div, round-up |
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133 | template<typename T> static inline T div_ru (T val, T div) |
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134 | { |
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135 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
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136 | } |
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137 | // div, round-down |
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138 | template<typename T> static inline T div_rd (T val, T div) |
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139 | { |
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140 | return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
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141 | } |
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142 | |
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143 | // lerp* only work correctly for min_in < max_in |
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144 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
106 | template<typename T> |
145 | template<typename T> |
107 | static inline T |
146 | static inline T |
108 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
147 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
109 | { |
148 | { |
110 | return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
149 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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150 | } |
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151 | |
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152 | // lerp, round-down |
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153 | template<typename T> |
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154 | static inline T |
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155 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
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156 | { |
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157 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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158 | } |
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159 | |
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160 | // lerp, round-up |
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161 | template<typename T> |
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162 | static inline T |
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163 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
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164 | { |
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165 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
111 | } |
166 | } |
112 | |
167 | |
113 | // lots of stuff taken from FXT |
168 | // lots of stuff taken from FXT |
114 | |
169 | |
115 | /* Rotate right. This is used in various places for checksumming */ |
170 | /* Rotate right. This is used in various places for checksumming */ |
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153 | int32_t d = b - a; |
208 | int32_t d = b - a; |
154 | d &= d >> 31; |
209 | d &= d >> 31; |
155 | return b - d; |
210 | return b - d; |
156 | } |
211 | } |
157 | |
212 | |
158 | // this is much faster than crossfires original algorithm |
213 | // this is much faster than crossfire's original algorithm |
159 | // on modern cpus |
214 | // on modern cpus |
160 | inline int |
215 | inline int |
161 | isqrt (int n) |
216 | isqrt (int n) |
162 | { |
217 | { |
163 | return (int)sqrtf ((float)n); |
218 | return (int)sqrtf ((float)n); |
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219 | } |
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220 | |
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221 | // this is kind of like the ^^ operator, if it would exist, without sequence point. |
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222 | // more handy than it looks like, due to the implicit !! done on its arguments |
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223 | inline bool |
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224 | logical_xor (bool a, bool b) |
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225 | { |
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226 | return a != b; |
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227 | } |
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228 | |
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229 | inline bool |
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230 | logical_implies (bool a, bool b) |
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231 | { |
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232 | return a <= b; |
164 | } |
233 | } |
165 | |
234 | |
166 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
235 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
167 | #if 0 |
236 | #if 0 |
168 | // and has a max. error of 6 in the range -100..+100. |
237 | // and has a max. error of 6 in the range -100..+100. |
… | |
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193 | absdir (int d) |
262 | absdir (int d) |
194 | { |
263 | { |
195 | return ((d - 1) & 7) + 1; |
264 | return ((d - 1) & 7) + 1; |
196 | } |
265 | } |
197 | |
266 | |
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267 | // avoid ctz name because netbsd or freebsd spams it's namespace with it |
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268 | #if GCC_VERSION(3,4) |
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269 | static inline int least_significant_bit (uint32_t x) |
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270 | { |
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271 | return __builtin_ctz (x); |
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272 | } |
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273 | #else |
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274 | int least_significant_bit (uint32_t x); |
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275 | #endif |
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276 | |
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277 | #define for_all_bits_sparse_32(mask, idxvar) \ |
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278 | for (uint32_t idxvar, mask_ = mask; \ |
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279 | mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);) |
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280 | |
198 | extern ssize_t slice_alloc; // statistics |
281 | extern ssize_t slice_alloc; // statistics |
199 | |
282 | |
200 | void *salloc_ (int n) throw (std::bad_alloc); |
283 | void *salloc_ (int n) throw (std::bad_alloc); |
201 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
284 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
202 | |
285 | |
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351 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
434 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
352 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
435 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
353 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
436 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
354 | struct tausworthe_random_generator |
437 | struct tausworthe_random_generator |
355 | { |
438 | { |
356 | // generator |
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357 | uint32_t state [4]; |
439 | uint32_t state [4]; |
358 | |
440 | |
359 | void operator =(const tausworthe_random_generator &src) |
441 | void operator =(const tausworthe_random_generator &src) |
360 | { |
442 | { |
361 | state [0] = src.state [0]; |
443 | state [0] = src.state [0]; |
… | |
… | |
364 | state [3] = src.state [3]; |
446 | state [3] = src.state [3]; |
365 | } |
447 | } |
366 | |
448 | |
367 | void seed (uint32_t seed); |
449 | void seed (uint32_t seed); |
368 | uint32_t next (); |
450 | uint32_t next (); |
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451 | }; |
369 | |
452 | |
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453 | // Xorshift RNGs, George Marsaglia |
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454 | // http://www.jstatsoft.org/v08/i14/paper |
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455 | // this one is about 40% faster than the tausworthe one above (i.e. not much), |
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456 | // despite the inlining, and has the issue of only creating 2**32-1 numbers. |
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457 | // see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf |
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458 | struct xorshift_random_generator |
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459 | { |
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460 | uint32_t x, y; |
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461 | |
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462 | void operator =(const xorshift_random_generator &src) |
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463 | { |
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464 | x = src.x; |
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465 | y = src.y; |
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466 | } |
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467 | |
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468 | void seed (uint32_t seed) |
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469 | { |
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470 | x = seed; |
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471 | y = seed * 69069U; |
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472 | } |
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473 | |
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474 | uint32_t next () |
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475 | { |
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476 | uint32_t t = x ^ (x << 10); |
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477 | x = y; |
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478 | y = y ^ (y >> 13) ^ t ^ (t >> 10); |
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479 | return y; |
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480 | } |
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481 | }; |
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482 | |
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483 | template<class generator> |
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484 | struct random_number_generator : generator |
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485 | { |
370 | // uniform distribution, 0 .. max (0, num - 1) |
486 | // uniform distribution, [0 .. num - 1] |
371 | uint32_t operator ()(uint32_t num) |
487 | uint32_t operator ()(uint32_t num) |
372 | { |
488 | { |
373 | return is_constant (num) |
489 | return !is_constant (num) ? get_range (num) // non-constant |
374 | ? (next () * (uint64_t)num) >> 32U |
490 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
375 | : get_range (num); |
491 | : this->next () & (num - 1); // constant, power-of-two |
376 | } |
492 | } |
377 | |
493 | |
378 | // return a number within (min .. max) |
494 | // return a number within the closed interval [min .. max] |
379 | int operator () (int r_min, int r_max) |
495 | int operator () (int r_min, int r_max) |
380 | { |
496 | { |
381 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
497 | return is_constant (r_min <= r_max) && r_min <= r_max |
382 | ? r_min + operator ()(r_max - r_min + 1) |
498 | ? r_min + operator ()(r_max - r_min + 1) |
383 | : get_range (r_min, r_max); |
499 | : get_range (r_min, r_max); |
384 | } |
500 | } |
385 | |
501 | |
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502 | // return a number within the half-open interval [0..1[ |
386 | double operator ()() |
503 | double operator ()() |
387 | { |
504 | { |
388 | return this->next () / (double)0xFFFFFFFFU; |
505 | return this->next () / (double)0x100000000; |
389 | } |
506 | } |
390 | |
507 | |
391 | protected: |
508 | protected: |
392 | uint32_t get_range (uint32_t r_max); |
509 | uint32_t get_range (uint32_t r_max); |
393 | int get_range (int r_min, int r_max); |
510 | int get_range (int r_min, int r_max); |
394 | }; |
511 | }; |
395 | |
512 | |
396 | typedef tausworthe_random_generator rand_gen; |
513 | typedef random_number_generator<tausworthe_random_generator> rand_gen; |
397 | |
514 | |
398 | extern rand_gen rndm, rmg_rndm; |
515 | extern rand_gen rndm, rmg_rndm; |
399 | |
516 | |
400 | INTERFACE_CLASS (attachable) |
517 | INTERFACE_CLASS (attachable) |
401 | struct refcnt_base |
518 | struct refcnt_base |
… | |
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465 | typedef refptr<maptile> maptile_ptr; |
582 | typedef refptr<maptile> maptile_ptr; |
466 | typedef refptr<object> object_ptr; |
583 | typedef refptr<object> object_ptr; |
467 | typedef refptr<archetype> arch_ptr; |
584 | typedef refptr<archetype> arch_ptr; |
468 | typedef refptr<client> client_ptr; |
585 | typedef refptr<client> client_ptr; |
469 | typedef refptr<player> player_ptr; |
586 | typedef refptr<player> player_ptr; |
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587 | typedef refptr<region> region_ptr; |
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588 | |
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589 | #define STRHSH_NULL 2166136261 |
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590 | |
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591 | static inline uint32_t |
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592 | strhsh (const char *s) |
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593 | { |
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594 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
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595 | // it is about twice as fast as the one-at-a-time one, |
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596 | // with good distribution. |
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597 | // FNV-1a is faster on many cpus because the multiplication |
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598 | // runs concurrently with the looping logic. |
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599 | uint32_t hash = STRHSH_NULL; |
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600 | |
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601 | while (*s) |
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602 | hash = (hash ^ *s++) * 16777619U; |
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603 | |
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604 | return hash; |
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605 | } |
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606 | |
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607 | static inline uint32_t |
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608 | memhsh (const char *s, size_t len) |
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609 | { |
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610 | uint32_t hash = STRHSH_NULL; |
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611 | |
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612 | while (len--) |
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613 | hash = (hash ^ *s++) * 16777619U; |
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614 | |
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615 | return hash; |
|
|
616 | } |
470 | |
617 | |
471 | struct str_hash |
618 | struct str_hash |
472 | { |
619 | { |
473 | std::size_t operator ()(const char *s) const |
620 | std::size_t operator ()(const char *s) const |
474 | { |
621 | { |
475 | unsigned long hash = 0; |
|
|
476 | |
|
|
477 | /* use the one-at-a-time hash function, which supposedly is |
|
|
478 | * better than the djb2-like one used by perl5.005, but |
|
|
479 | * certainly is better then the bug used here before. |
|
|
480 | * see http://burtleburtle.net/bob/hash/doobs.html |
|
|
481 | */ |
|
|
482 | while (*s) |
|
|
483 | { |
|
|
484 | hash += *s++; |
|
|
485 | hash += hash << 10; |
|
|
486 | hash ^= hash >> 6; |
|
|
487 | } |
|
|
488 | |
|
|
489 | hash += hash << 3; |
|
|
490 | hash ^= hash >> 11; |
|
|
491 | hash += hash << 15; |
|
|
492 | |
|
|
493 | return hash; |
622 | return strhsh (s); |
|
|
623 | } |
|
|
624 | |
|
|
625 | std::size_t operator ()(const shstr &s) const |
|
|
626 | { |
|
|
627 | return strhsh (s); |
494 | } |
628 | } |
495 | }; |
629 | }; |
496 | |
630 | |
497 | struct str_equal |
631 | struct str_equal |
498 | { |
632 | { |
… | |
… | |
591 | erase (&obj); |
725 | erase (&obj); |
592 | } |
726 | } |
593 | }; |
727 | }; |
594 | |
728 | |
595 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
729 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
|
|
730 | // returns the number of bytes actually used (including \0) |
596 | void assign (char *dst, const char *src, int maxlen); |
731 | int assign (char *dst, const char *src, int maxsize); |
597 | |
732 | |
598 | // type-safe version of assign |
733 | // type-safe version of assign |
599 | template<int N> |
734 | template<int N> |
600 | inline void assign (char (&dst)[N], const char *src) |
735 | inline int assign (char (&dst)[N], const char *src) |
601 | { |
736 | { |
602 | assign ((char *)&dst, src, N); |
737 | return assign ((char *)&dst, src, N); |
603 | } |
738 | } |
604 | |
739 | |
605 | typedef double tstamp; |
740 | typedef double tstamp; |
606 | |
741 | |
607 | // return current time as timestamp |
742 | // return current time as timestamp |
608 | tstamp now (); |
743 | tstamp now (); |
609 | |
744 | |
610 | int similar_direction (int a, int b); |
745 | int similar_direction (int a, int b); |
611 | |
746 | |
612 | // like sprintf, but returns a "static" buffer |
747 | // like v?sprintf, but returns a "static" buffer |
613 | const char *format (const char *format, ...); |
748 | char *vformat (const char *format, va_list ap); |
|
|
749 | char *format (const char *format, ...) attribute ((format (printf, 1, 2))); |
|
|
750 | |
|
|
751 | // safety-check player input which will become object->msg |
|
|
752 | bool msg_is_safe (const char *msg); |
614 | |
753 | |
615 | ///////////////////////////////////////////////////////////////////////////// |
754 | ///////////////////////////////////////////////////////////////////////////// |
616 | // threads, very very thin wrappers around pthreads |
755 | // threads, very very thin wrappers around pthreads |
617 | |
756 | |
618 | struct thread |
757 | struct thread |