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1 | /* |
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2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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5 | * |
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6 | * Deliantra is free software: you can redistribute it and/or modify it under |
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7 | * the terms of the Affero GNU General Public License as published by the |
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8 | * Free Software Foundation, either version 3 of the License, or (at your |
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9 | * option) any later version. |
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10 | * |
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11 | * This program is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | * GNU General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the Affero GNU General Public License |
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17 | * and the GNU General Public License along with this program. If not, see |
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18 | * <http://www.gnu.org/licenses/>. |
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19 | * |
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20 | * The authors can be reached via e-mail to <support@deliantra.net> |
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21 | */ |
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22 | |
1 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
2 | #define UTIL_H__ |
24 | #define UTIL_H__ |
3 | |
25 | |
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26 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
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27 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
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28 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
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29 | |
4 | #if __GNUC__ >= 3 |
30 | #if __GNUC__ >= 3 |
5 | # define is_constant(c) __builtin_constant_p (c) |
31 | # define is_constant(c) __builtin_constant_p (c) |
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32 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
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33 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
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34 | # define noinline __attribute__((__noinline__)) |
6 | #else |
35 | #else |
7 | # define is_constant(c) 0 |
36 | # define is_constant(c) 0 |
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37 | # define expect(expr,value) (expr) |
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38 | # define prefetch(addr,rw,locality) |
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39 | # define noinline |
8 | #endif |
40 | #endif |
9 | |
41 | |
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42 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
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43 | # define decltype(x) typeof(x) |
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44 | #endif |
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45 | |
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46 | // put into ifs if you are very sure that the expression |
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47 | // is mostly true or mosty false. note that these return |
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48 | // booleans, not the expression. |
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49 | #define expect_false(expr) expect ((expr) ? 1 : 0, 0) |
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50 | #define expect_true(expr) expect ((expr) ? 1 : 0, 1) |
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51 | |
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52 | #include <pthread.h> |
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53 | |
10 | #include <cstddef> |
54 | #include <cstddef> |
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55 | #include <cmath> |
11 | #include <new> |
56 | #include <new> |
12 | #include <vector> |
57 | #include <vector> |
13 | |
58 | |
14 | #include <glib.h> |
59 | #include <glib.h> |
15 | |
60 | |
16 | #include <shstr.h> |
61 | #include <shstr.h> |
17 | #include <traits.h> |
62 | #include <traits.h> |
18 | |
63 | |
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64 | #if DEBUG_SALLOC |
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65 | # define g_slice_alloc0(s) debug_slice_alloc0(s) |
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66 | # define g_slice_alloc(s) debug_slice_alloc(s) |
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67 | # define g_slice_free1(s,p) debug_slice_free1(s,p) |
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68 | void *g_slice_alloc (unsigned long size); |
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69 | void *g_slice_alloc0 (unsigned long size); |
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70 | void g_slice_free1 (unsigned long size, void *ptr); |
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71 | #elif PREFER_MALLOC |
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72 | # define g_slice_alloc0(s) calloc (1, (s)) |
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73 | # define g_slice_alloc(s) malloc ((s)) |
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74 | # define g_slice_free1(s,p) free ((p)) |
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75 | #endif |
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76 | |
19 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
77 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
20 | #define AUTODECL(var,expr) typeof(expr) var = (expr) |
78 | #define auto(var,expr) decltype(expr) var = (expr) |
21 | |
79 | |
22 | // very ugly macro that basicaly declares and initialises a variable |
80 | // very ugly macro that basically declares and initialises a variable |
23 | // that is in scope for the next statement only |
81 | // that is in scope for the next statement only |
24 | // works only for stuff that can be assigned 0 and converts to false |
82 | // works only for stuff that can be assigned 0 and converts to false |
25 | // (note: works great for pointers) |
83 | // (note: works great for pointers) |
26 | // most ugly macro I ever wrote |
84 | // most ugly macro I ever wrote |
27 | #define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
85 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
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86 | |
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87 | // in range including end |
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88 | #define IN_RANGE_INC(val,beg,end) \ |
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89 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
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90 | |
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91 | // in range excluding end |
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92 | #define IN_RANGE_EXC(val,beg,end) \ |
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93 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
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94 | |
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95 | void cleanup (const char *cause, bool make_core = false); |
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96 | void fork_abort (const char *msg); |
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97 | |
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98 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
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99 | // as a is often a constant while b is the variable. it is still a bug, though. |
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100 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
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101 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
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102 | 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; } |
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103 | |
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104 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
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105 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
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106 | 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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107 | |
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108 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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109 | |
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110 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
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111 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
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112 | |
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113 | // sign returns -1 or +1 |
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114 | template<typename T> |
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115 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
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116 | // relies on 2c representation |
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117 | template<> |
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118 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
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119 | |
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120 | // sign0 returns -1, 0 or +1 |
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121 | template<typename T> |
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122 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
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123 | |
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124 | // div* only work correctly for div > 0 |
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125 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
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126 | template<typename T> static inline T div (T val, T div) |
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127 | { |
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128 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
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129 | } |
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130 | // div, round-up |
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131 | template<typename T> static inline T div_ru (T val, T div) |
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132 | { |
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133 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
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134 | } |
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135 | // div, round-down |
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136 | template<typename T> static inline T div_rd (T val, T div) |
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137 | { |
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138 | return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
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139 | } |
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140 | |
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141 | // lerp* only work correctly for min_in < max_in |
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142 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
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143 | template<typename T> |
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144 | static inline T |
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145 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
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146 | { |
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147 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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148 | } |
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149 | |
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150 | // lerp, round-down |
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151 | template<typename T> |
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152 | static inline T |
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153 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
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154 | { |
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155 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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156 | } |
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157 | |
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158 | // lerp, round-up |
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159 | template<typename T> |
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160 | static inline T |
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161 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
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162 | { |
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163 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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164 | } |
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165 | |
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166 | // lots of stuff taken from FXT |
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167 | |
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168 | /* Rotate right. This is used in various places for checksumming */ |
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169 | //TODO: that sucks, use a better checksum algo |
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170 | static inline uint32_t |
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171 | rotate_right (uint32_t c, uint32_t count = 1) |
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172 | { |
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173 | return (c << (32 - count)) | (c >> count); |
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174 | } |
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175 | |
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176 | static inline uint32_t |
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177 | rotate_left (uint32_t c, uint32_t count = 1) |
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178 | { |
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179 | return (c >> (32 - count)) | (c << count); |
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180 | } |
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181 | |
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182 | // Return abs(a-b) |
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183 | // Both a and b must not have the most significant bit set |
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184 | static inline uint32_t |
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185 | upos_abs_diff (uint32_t a, uint32_t b) |
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186 | { |
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187 | long d1 = b - a; |
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188 | long d2 = (d1 & (d1 >> 31)) << 1; |
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189 | |
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190 | return d1 - d2; // == (b - d) - (a + d); |
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191 | } |
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192 | |
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193 | // Both a and b must not have the most significant bit set |
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194 | static inline uint32_t |
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195 | upos_min (uint32_t a, uint32_t b) |
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196 | { |
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197 | int32_t d = b - a; |
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198 | d &= d >> 31; |
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199 | return a + d; |
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200 | } |
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201 | |
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202 | // Both a and b must not have the most significant bit set |
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203 | static inline uint32_t |
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204 | upos_max (uint32_t a, uint32_t b) |
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205 | { |
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206 | int32_t d = b - a; |
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207 | d &= d >> 31; |
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208 | return b - d; |
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209 | } |
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210 | |
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211 | // this is much faster than crossfires original algorithm |
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212 | // on modern cpus |
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213 | inline int |
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214 | isqrt (int n) |
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215 | { |
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216 | return (int)sqrtf ((float)n); |
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217 | } |
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218 | |
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219 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
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220 | #if 0 |
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221 | // and has a max. error of 6 in the range -100..+100. |
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222 | #else |
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223 | // and has a max. error of 9 in the range -100..+100. |
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224 | #endif |
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225 | inline int |
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226 | idistance (int dx, int dy) |
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227 | { |
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228 | unsigned int dx_ = abs (dx); |
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229 | unsigned int dy_ = abs (dy); |
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230 | |
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231 | #if 0 |
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232 | return dx_ > dy_ |
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233 | ? (dx_ * 61685 + dy_ * 26870) >> 16 |
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234 | : (dy_ * 61685 + dx_ * 26870) >> 16; |
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235 | #else |
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236 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
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237 | #endif |
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238 | } |
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239 | |
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240 | /* |
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241 | * absdir(int): Returns a number between 1 and 8, which represent |
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242 | * the "absolute" direction of a number (it actually takes care of |
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243 | * "overflow" in previous calculations of a direction). |
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244 | */ |
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245 | inline int |
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246 | absdir (int d) |
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247 | { |
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248 | return ((d - 1) & 7) + 1; |
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249 | } |
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250 | |
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251 | extern ssize_t slice_alloc; // statistics |
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252 | |
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253 | void *salloc_ (int n) throw (std::bad_alloc); |
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254 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
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255 | |
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256 | // strictly the same as g_slice_alloc, but never returns 0 |
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257 | template<typename T> |
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258 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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259 | |
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260 | // also copies src into the new area, like "memdup" |
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261 | // if src is 0, clears the memory |
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262 | template<typename T> |
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263 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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264 | |
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265 | // clears the memory |
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266 | template<typename T> |
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267 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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268 | |
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269 | // for symmetry |
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270 | template<typename T> |
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271 | inline void sfree (T *ptr, int n = 1) throw () |
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272 | { |
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273 | if (expect_true (ptr)) |
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274 | { |
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275 | slice_alloc -= n * sizeof (T); |
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276 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
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277 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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278 | assert (slice_alloc >= 0);//D |
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279 | } |
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280 | } |
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281 | |
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282 | // nulls the pointer |
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283 | template<typename T> |
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284 | inline void sfree0 (T *&ptr, int n = 1) throw () |
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285 | { |
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286 | sfree<T> (ptr, n); |
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287 | ptr = 0; |
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288 | } |
28 | |
289 | |
29 | // makes dynamically allocated objects zero-initialised |
290 | // makes dynamically allocated objects zero-initialised |
30 | struct zero_initialised |
291 | struct zero_initialised |
31 | { |
292 | { |
32 | void *operator new (size_t s, void *p) |
293 | void *operator new (size_t s, void *p) |
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35 | return p; |
296 | return p; |
36 | } |
297 | } |
37 | |
298 | |
38 | void *operator new (size_t s) |
299 | void *operator new (size_t s) |
39 | { |
300 | { |
40 | return g_slice_alloc0 (s); |
301 | return salloc0<char> (s); |
41 | } |
302 | } |
42 | |
303 | |
43 | void *operator new[] (size_t s) |
304 | void *operator new[] (size_t s) |
44 | { |
305 | { |
45 | return g_slice_alloc0 (s); |
306 | return salloc0<char> (s); |
46 | } |
307 | } |
47 | |
308 | |
48 | void operator delete (void *p, size_t s) |
309 | void operator delete (void *p, size_t s) |
49 | { |
310 | { |
50 | g_slice_free1 (s, p); |
311 | sfree ((char *)p, s); |
51 | } |
312 | } |
52 | |
313 | |
53 | void operator delete[] (void *p, size_t s) |
314 | void operator delete[] (void *p, size_t s) |
54 | { |
315 | { |
55 | g_slice_free1 (s, p); |
316 | sfree ((char *)p, s); |
56 | } |
317 | } |
57 | }; |
318 | }; |
58 | |
319 | |
59 | void *salloc_ (int n) throw (std::bad_alloc); |
320 | // makes dynamically allocated objects zero-initialised |
60 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
321 | struct slice_allocated |
61 | |
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62 | // strictly the same as g_slice_alloc, but never returns 0 |
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63 | template<typename T> |
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64 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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65 | |
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66 | // also copies src into the new area, like "memdup" |
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67 | // if src is 0, clears the memory |
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68 | template<typename T> |
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69 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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70 | |
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71 | // clears the memory |
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72 | template<typename T> |
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73 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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74 | |
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75 | // for symmetry |
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76 | template<typename T> |
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77 | inline void sfree (T *ptr, int n = 1) throw () |
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78 | { |
322 | { |
79 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
323 | void *operator new (size_t s, void *p) |
80 | } |
324 | { |
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325 | return p; |
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326 | } |
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327 | |
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328 | void *operator new (size_t s) |
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329 | { |
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330 | return salloc<char> (s); |
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331 | } |
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332 | |
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333 | void *operator new[] (size_t s) |
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334 | { |
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335 | return salloc<char> (s); |
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336 | } |
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337 | |
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338 | void operator delete (void *p, size_t s) |
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339 | { |
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340 | sfree ((char *)p, s); |
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341 | } |
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342 | |
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343 | void operator delete[] (void *p, size_t s) |
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344 | { |
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345 | sfree ((char *)p, s); |
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346 | } |
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347 | }; |
81 | |
348 | |
82 | // a STL-compatible allocator that uses g_slice |
349 | // a STL-compatible allocator that uses g_slice |
83 | // boy, this is verbose |
350 | // boy, this is verbose |
84 | template<typename Tp> |
351 | template<typename Tp> |
85 | struct slice_allocator |
352 | struct slice_allocator |
… | |
… | |
97 | { |
364 | { |
98 | typedef slice_allocator<U> other; |
365 | typedef slice_allocator<U> other; |
99 | }; |
366 | }; |
100 | |
367 | |
101 | slice_allocator () throw () { } |
368 | slice_allocator () throw () { } |
102 | slice_allocator (const slice_allocator &o) throw () { } |
369 | slice_allocator (const slice_allocator &) throw () { } |
103 | template<typename Tp2> |
370 | template<typename Tp2> |
104 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
371 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
105 | |
372 | |
106 | ~slice_allocator () { } |
373 | ~slice_allocator () { } |
107 | |
374 | |
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116 | void deallocate (pointer p, size_type n) |
383 | void deallocate (pointer p, size_type n) |
117 | { |
384 | { |
118 | sfree<Tp> (p, n); |
385 | sfree<Tp> (p, n); |
119 | } |
386 | } |
120 | |
387 | |
121 | size_type max_size ()const throw () |
388 | size_type max_size () const throw () |
122 | { |
389 | { |
123 | return size_t (-1) / sizeof (Tp); |
390 | return size_t (-1) / sizeof (Tp); |
124 | } |
391 | } |
125 | |
392 | |
126 | void construct (pointer p, const Tp &val) |
393 | void construct (pointer p, const Tp &val) |
… | |
… | |
131 | void destroy (pointer p) |
398 | void destroy (pointer p) |
132 | { |
399 | { |
133 | p->~Tp (); |
400 | p->~Tp (); |
134 | } |
401 | } |
135 | }; |
402 | }; |
|
|
403 | |
|
|
404 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
|
|
405 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
|
|
406 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
|
|
407 | struct tausworthe_random_generator |
|
|
408 | { |
|
|
409 | uint32_t state [4]; |
|
|
410 | |
|
|
411 | void operator =(const tausworthe_random_generator &src) |
|
|
412 | { |
|
|
413 | state [0] = src.state [0]; |
|
|
414 | state [1] = src.state [1]; |
|
|
415 | state [2] = src.state [2]; |
|
|
416 | state [3] = src.state [3]; |
|
|
417 | } |
|
|
418 | |
|
|
419 | void seed (uint32_t seed); |
|
|
420 | uint32_t next (); |
|
|
421 | }; |
|
|
422 | |
|
|
423 | // Xorshift RNGs, George Marsaglia |
|
|
424 | // http://www.jstatsoft.org/v08/i14/paper |
|
|
425 | // this one is about 40% faster than the tausworthe one above (i.e. not much), |
|
|
426 | // despite the inlining, and has the issue of only creating 2**32-1 numbers. |
|
|
427 | // see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf |
|
|
428 | struct xorshift_random_generator |
|
|
429 | { |
|
|
430 | uint32_t x, y; |
|
|
431 | |
|
|
432 | void operator =(const xorshift_random_generator &src) |
|
|
433 | { |
|
|
434 | x = src.x; |
|
|
435 | y = src.y; |
|
|
436 | } |
|
|
437 | |
|
|
438 | void seed (uint32_t seed) |
|
|
439 | { |
|
|
440 | x = seed; |
|
|
441 | y = seed * 69069U; |
|
|
442 | } |
|
|
443 | |
|
|
444 | uint32_t next () |
|
|
445 | { |
|
|
446 | uint32_t t = x ^ (x << 10); |
|
|
447 | x = y; |
|
|
448 | y = y ^ (y >> 13) ^ t ^ (t >> 10); |
|
|
449 | return y; |
|
|
450 | } |
|
|
451 | }; |
|
|
452 | |
|
|
453 | template<class generator> |
|
|
454 | struct random_number_generator : generator |
|
|
455 | { |
|
|
456 | // uniform distribution, 0 .. max (0, num - 1) |
|
|
457 | uint32_t operator ()(uint32_t num) |
|
|
458 | { |
|
|
459 | return !is_constant (num) ? get_range (num) // non-constant |
|
|
460 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
|
|
461 | : this->next () & (num - 1); // constant, power-of-two |
|
|
462 | } |
|
|
463 | |
|
|
464 | // return a number within (min .. max) |
|
|
465 | int operator () (int r_min, int r_max) |
|
|
466 | { |
|
|
467 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
|
|
468 | ? r_min + operator ()(r_max - r_min + 1) |
|
|
469 | : get_range (r_min, r_max); |
|
|
470 | } |
|
|
471 | |
|
|
472 | double operator ()() |
|
|
473 | { |
|
|
474 | return this->next () / (double)0xFFFFFFFFU; |
|
|
475 | } |
|
|
476 | |
|
|
477 | protected: |
|
|
478 | uint32_t get_range (uint32_t r_max); |
|
|
479 | int get_range (int r_min, int r_max); |
|
|
480 | }; |
|
|
481 | |
|
|
482 | typedef random_number_generator<tausworthe_random_generator> rand_gen; |
|
|
483 | |
|
|
484 | extern rand_gen rndm, rmg_rndm; |
|
|
485 | |
|
|
486 | INTERFACE_CLASS (attachable) |
|
|
487 | struct refcnt_base |
|
|
488 | { |
|
|
489 | typedef int refcnt_t; |
|
|
490 | mutable refcnt_t ACC (RW, refcnt); |
|
|
491 | |
|
|
492 | MTH void refcnt_inc () const { ++refcnt; } |
|
|
493 | MTH void refcnt_dec () const { --refcnt; } |
|
|
494 | |
|
|
495 | refcnt_base () : refcnt (0) { } |
|
|
496 | }; |
|
|
497 | |
|
|
498 | // to avoid branches with more advanced compilers |
|
|
499 | extern refcnt_base::refcnt_t refcnt_dummy; |
136 | |
500 | |
137 | template<class T> |
501 | template<class T> |
138 | struct refptr |
502 | struct refptr |
139 | { |
503 | { |
|
|
504 | // p if not null |
|
|
505 | refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } |
|
|
506 | |
|
|
507 | void refcnt_dec () |
|
|
508 | { |
|
|
509 | if (!is_constant (p)) |
|
|
510 | --*refcnt_ref (); |
|
|
511 | else if (p) |
|
|
512 | --p->refcnt; |
|
|
513 | } |
|
|
514 | |
|
|
515 | void refcnt_inc () |
|
|
516 | { |
|
|
517 | if (!is_constant (p)) |
|
|
518 | ++*refcnt_ref (); |
|
|
519 | else if (p) |
|
|
520 | ++p->refcnt; |
|
|
521 | } |
|
|
522 | |
140 | T *p; |
523 | T *p; |
141 | |
524 | |
142 | refptr () : p(0) { } |
525 | refptr () : p(0) { } |
143 | refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } |
526 | refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); } |
144 | refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } |
527 | refptr (T *p) : p(p) { refcnt_inc (); } |
145 | ~refptr () { if (p) p->refcnt_dec (); } |
528 | ~refptr () { refcnt_dec (); } |
146 | |
529 | |
147 | const refptr<T> &operator =(T *o) |
530 | const refptr<T> &operator =(T *o) |
148 | { |
531 | { |
|
|
532 | // if decrementing ever destroys we need to reverse the order here |
149 | if (p) p->refcnt_dec (); |
533 | refcnt_dec (); |
150 | p = o; |
534 | p = o; |
151 | if (p) p->refcnt_inc (); |
535 | refcnt_inc (); |
152 | |
|
|
153 | return *this; |
536 | return *this; |
154 | } |
537 | } |
155 | |
538 | |
156 | const refptr<T> &operator =(const refptr<T> o) |
539 | const refptr<T> &operator =(const refptr<T> &o) |
157 | { |
540 | { |
158 | *this = o.p; |
541 | *this = o.p; |
159 | return *this; |
542 | return *this; |
160 | } |
543 | } |
161 | |
544 | |
162 | T &operator * () const { return *p; } |
545 | T &operator * () const { return *p; } |
163 | T *operator ->() const { return p; } |
546 | T *operator ->() const { return p; } |
164 | |
547 | |
165 | operator T *() const { return p; } |
548 | operator T *() const { return p; } |
166 | }; |
549 | }; |
167 | |
550 | |
168 | typedef refptr<maptile> maptile_ptr; |
551 | typedef refptr<maptile> maptile_ptr; |
… | |
… | |
173 | |
556 | |
174 | struct str_hash |
557 | struct str_hash |
175 | { |
558 | { |
176 | std::size_t operator ()(const char *s) const |
559 | std::size_t operator ()(const char *s) const |
177 | { |
560 | { |
178 | unsigned long hash = 0; |
561 | #if 0 |
|
|
562 | uint32_t hash = 0; |
179 | |
563 | |
180 | /* use the one-at-a-time hash function, which supposedly is |
564 | /* use the one-at-a-time hash function, which supposedly is |
181 | * better than the djb2-like one used by perl5.005, but |
565 | * better than the djb2-like one used by perl5.005, but |
182 | * certainly is better then the bug used here before. |
566 | * certainly is better then the bug used here before. |
183 | * see http://burtleburtle.net/bob/hash/doobs.html |
567 | * see http://burtleburtle.net/bob/hash/doobs.html |
… | |
… | |
190 | } |
574 | } |
191 | |
575 | |
192 | hash += hash << 3; |
576 | hash += hash << 3; |
193 | hash ^= hash >> 11; |
577 | hash ^= hash >> 11; |
194 | hash += hash << 15; |
578 | hash += hash << 15; |
|
|
579 | #else |
|
|
580 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
|
|
581 | // it is about twice as fast as the one-at-a-time one, |
|
|
582 | // with good distribution. |
|
|
583 | // FNV-1a is faster on many cpus because the multiplication |
|
|
584 | // runs concurrent with the looping logic. |
|
|
585 | uint32_t hash = 2166136261; |
|
|
586 | |
|
|
587 | while (*s) |
|
|
588 | hash = (hash ^ *s++) * 16777619; |
|
|
589 | #endif |
195 | |
590 | |
196 | return hash; |
591 | return hash; |
197 | } |
592 | } |
198 | }; |
593 | }; |
199 | |
594 | |
… | |
… | |
203 | { |
598 | { |
204 | return !strcmp (a, b); |
599 | return !strcmp (a, b); |
205 | } |
600 | } |
206 | }; |
601 | }; |
207 | |
602 | |
|
|
603 | // Mostly the same as std::vector, but insert/erase can reorder |
|
|
604 | // the elements, making append(=insert)/remove O(1) instead of O(n). |
|
|
605 | // |
|
|
606 | // NOTE: only some forms of erase are available |
208 | template<class T> |
607 | template<class T> |
209 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
608 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
210 | { |
609 | { |
211 | typedef typename unordered_vector::iterator iterator; |
610 | typedef typename unordered_vector::iterator iterator; |
212 | |
611 | |
… | |
… | |
222 | { |
621 | { |
223 | erase ((unsigned int )(i - this->begin ())); |
622 | erase ((unsigned int )(i - this->begin ())); |
224 | } |
623 | } |
225 | }; |
624 | }; |
226 | |
625 | |
227 | template<class T, int T::* index> |
626 | // This container blends advantages of linked lists |
|
|
627 | // (efficiency) with vectors (random access) by |
|
|
628 | // by using an unordered vector and storing the vector |
|
|
629 | // index inside the object. |
|
|
630 | // |
|
|
631 | // + memory-efficient on most 64 bit archs |
|
|
632 | // + O(1) insert/remove |
|
|
633 | // + free unique (but varying) id for inserted objects |
|
|
634 | // + cache-friendly iteration |
|
|
635 | // - only works for pointers to structs |
|
|
636 | // |
|
|
637 | // NOTE: only some forms of erase/insert are available |
|
|
638 | typedef int object_vector_index; |
|
|
639 | |
|
|
640 | template<class T, object_vector_index T::*indexmember> |
228 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
641 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
229 | { |
642 | { |
|
|
643 | typedef typename object_vector::iterator iterator; |
|
|
644 | |
|
|
645 | bool contains (const T *obj) const |
|
|
646 | { |
|
|
647 | return obj->*indexmember; |
|
|
648 | } |
|
|
649 | |
|
|
650 | iterator find (const T *obj) |
|
|
651 | { |
|
|
652 | return obj->*indexmember |
|
|
653 | ? this->begin () + obj->*indexmember - 1 |
|
|
654 | : this->end (); |
|
|
655 | } |
|
|
656 | |
|
|
657 | void push_back (T *obj) |
|
|
658 | { |
|
|
659 | std::vector<T *, slice_allocator<T *> >::push_back (obj); |
|
|
660 | obj->*indexmember = this->size (); |
|
|
661 | } |
|
|
662 | |
230 | void insert (T *obj) |
663 | void insert (T *obj) |
231 | { |
664 | { |
232 | assert (!(obj->*index)); |
|
|
233 | push_back (obj); |
665 | push_back (obj); |
234 | obj->*index = this->size (); |
|
|
235 | } |
666 | } |
236 | |
667 | |
237 | void insert (T &obj) |
668 | void insert (T &obj) |
238 | { |
669 | { |
239 | insert (&obj); |
670 | insert (&obj); |
240 | } |
671 | } |
241 | |
672 | |
242 | void erase (T *obj) |
673 | void erase (T *obj) |
243 | { |
674 | { |
244 | assert (obj->*index); |
|
|
245 | int pos = obj->*index; |
675 | unsigned int pos = obj->*indexmember; |
246 | obj->*index = 0; |
676 | obj->*indexmember = 0; |
247 | |
677 | |
248 | if (pos < this->size ()) |
678 | if (pos < this->size ()) |
249 | { |
679 | { |
250 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
680 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
251 | (*this)[pos - 1]->*index = pos; |
681 | (*this)[pos - 1]->*indexmember = pos; |
252 | } |
682 | } |
253 | |
683 | |
254 | this->pop_back (); |
684 | this->pop_back (); |
255 | } |
685 | } |
256 | |
686 | |
257 | void erase (T &obj) |
687 | void erase (T &obj) |
258 | { |
688 | { |
259 | errase (&obj); |
689 | erase (&obj); |
260 | } |
690 | } |
261 | }; |
691 | }; |
262 | |
|
|
263 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
|
|
264 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
|
|
265 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; } |
|
|
266 | |
|
|
267 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
|
|
268 | |
692 | |
269 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
693 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
|
|
694 | // returns the number of bytes actually used (including \0) |
270 | void assign (char *dst, const char *src, int maxlen); |
695 | int assign (char *dst, const char *src, int maxsize); |
271 | |
696 | |
272 | // type-safe version of assign |
697 | // type-safe version of assign |
273 | template<int N> |
698 | template<int N> |
274 | inline void assign (char (&dst)[N], const char *src) |
699 | inline int assign (char (&dst)[N], const char *src) |
275 | { |
700 | { |
276 | assign ((char *)&dst, src, N); |
701 | return assign ((char *)&dst, src, N); |
277 | } |
702 | } |
278 | |
703 | |
279 | typedef double tstamp; |
704 | typedef double tstamp; |
280 | |
705 | |
281 | // return current time as timestampe |
706 | // return current time as timestamp |
282 | tstamp now (); |
707 | tstamp now (); |
283 | |
708 | |
284 | int similar_direction (int a, int b); |
709 | int similar_direction (int a, int b); |
285 | |
710 | |
|
|
711 | // like v?sprintf, but returns a "static" buffer |
|
|
712 | char *vformat (const char *format, va_list ap); |
|
|
713 | char *format (const char *format, ...); |
|
|
714 | |
|
|
715 | // safety-check player input which will become object->msg |
|
|
716 | bool msg_is_safe (const char *msg); |
|
|
717 | |
|
|
718 | ///////////////////////////////////////////////////////////////////////////// |
|
|
719 | // threads, very very thin wrappers around pthreads |
|
|
720 | |
|
|
721 | struct thread |
|
|
722 | { |
|
|
723 | pthread_t id; |
|
|
724 | |
|
|
725 | void start (void *(*start_routine)(void *), void *arg = 0); |
|
|
726 | |
|
|
727 | void cancel () |
|
|
728 | { |
|
|
729 | pthread_cancel (id); |
|
|
730 | } |
|
|
731 | |
|
|
732 | void *join () |
|
|
733 | { |
|
|
734 | void *ret; |
|
|
735 | |
|
|
736 | if (pthread_join (id, &ret)) |
|
|
737 | cleanup ("pthread_join failed", 1); |
|
|
738 | |
|
|
739 | return ret; |
|
|
740 | } |
|
|
741 | }; |
|
|
742 | |
|
|
743 | // note that mutexes are not classes |
|
|
744 | typedef pthread_mutex_t smutex; |
|
|
745 | |
|
|
746 | #if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) |
|
|
747 | #define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP |
|
|
748 | #else |
|
|
749 | #define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER |
286 | #endif |
750 | #endif |
287 | |
751 | |
|
|
752 | #define SMUTEX(name) smutex name = SMUTEX_INITIALISER |
|
|
753 | #define SMUTEX_LOCK(name) pthread_mutex_lock (&(name)) |
|
|
754 | #define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name)) |
|
|
755 | |
|
|
756 | typedef pthread_cond_t scond; |
|
|
757 | |
|
|
758 | #define SCOND(name) scond name = PTHREAD_COND_INITIALIZER |
|
|
759 | #define SCOND_SIGNAL(name) pthread_cond_signal (&(name)) |
|
|
760 | #define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name)) |
|
|
761 | #define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex)) |
|
|
762 | |
|
|
763 | #endif |
|
|
764 | |