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Comparing deliantra/server/include/util.h (file contents):
Revision 1.72 by root, Wed Apr 30 16:26:28 2008 UTC vs.
Revision 1.94 by root, Sun Nov 8 16:13:45 2009 UTC

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 Marc Alexander Lehmann / Robin Redeker / the Deliantra team 4 * Copyright (©) 2005,2006,2007,2008 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
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
26#include <compiler.h>
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
29#if __GNUC__ >= 3
30# define is_constant(c) __builtin_constant_p (c)
31# define expect(expr,value) __builtin_expect ((expr),(value))
32# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
33#else
34# define is_constant(c) 0
35# define expect(expr,value) (expr)
36# define prefetch(addr,rw,locality)
37#endif
38
39#if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4)
40# define decltype(x) typeof(x)
41#endif
42
43// put into ifs if you are very sure that the expression
44// is mostly true or mosty false. note that these return
45// booleans, not the expression.
46#define expect_false(expr) expect ((expr) != 0, 0)
47#define expect_true(expr) expect ((expr) != 0, 1)
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
77// very ugly macro that basicaly declares and initialises a variable 60// very ugly macro that basically declares and initialises a variable
78// that is in scope for the next statement only 61// that is in scope for the next statement only
79// works only for stuff that can be assigned 0 and converts to false 62// works only for stuff that can be assigned 0 and converts to false
80// (note: works great for pointers) 63// (note: works great for pointers)
81// most ugly macro I ever wrote 64// most ugly macro I ever wrote
82#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) 65#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. 79// as a is often a constant while b is the variable. it is still a bug, though.
97template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } 80template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }
98template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } 81template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }
99template<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; } 82template<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 83
84template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
85template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
86template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); }
87
101template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } 88template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
102 89
103template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } 90template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); }
104template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } 91template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
105 92
93// sign returns -1 or +1
94template<typename T>
95static inline T sign (T v) { return v < 0 ? -1 : +1; }
96// relies on 2c representation
97template<>
98inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
99
100// sign0 returns -1, 0 or +1
101template<typename T>
102static inline T sign0 (T v) { return v ? sign (v) : 0; }
103
104// div* only work correctly for div > 0
105// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
106template<typename T> static inline T div (T val, T div)
107{
108 return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
109}
110// div, round-up
111template<typename T> static inline T div_ru (T val, T div)
112{
113 return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
114}
115// div, round-down
116template<typename T> static inline T div_rd (T val, T div)
117{
118 return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div;
119}
120
121// lerp* only work correctly for min_in < max_in
122// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
106template<typename T> 123template<typename T>
107static inline T 124static inline T
108lerp (T val, T min_in, T max_in, T min_out, T max_out) 125lerp (T val, T min_in, T max_in, T min_out, T max_out)
109{ 126{
110 return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; 127 return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
128}
129
130// lerp, round-down
131template<typename T>
132static inline T
133lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
134{
135 return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
136}
137
138// lerp, round-up
139template<typename T>
140static inline T
141lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
142{
143 return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
111} 144}
112 145
113// lots of stuff taken from FXT 146// lots of stuff taken from FXT
114 147
115/* Rotate right. This is used in various places for checksumming */ 148/* Rotate right. This is used in various places for checksumming */
… …
153 int32_t d = b - a; 186 int32_t d = b - a;
154 d &= d >> 31; 187 d &= d >> 31;
155 return b - d; 188 return b - d;
156} 189}
157 190
158// this is much faster than crossfires original algorithm 191// this is much faster than crossfire's original algorithm
159// on modern cpus 192// on modern cpus
160inline int 193inline int
161isqrt (int n) 194isqrt (int n)
162{ 195{
163 return (int)sqrtf ((float)n); 196 return (int)sqrtf ((float)n);
197}
198
199// this is kind of like the ^^ operator, if it would exist, without sequence point.
200// more handy than it looks like, due to the implicit !! done on its arguments
201inline bool
202logical_xor (bool a, bool b)
203{
204 return a != b;
205}
206
207inline bool
208logical_implies (bool a, bool b)
209{
210 return a <= b;
164} 211}
165 212
166// this is only twice as fast as naive sqrtf (dx*dy+dy*dy) 213// this is only twice as fast as naive sqrtf (dx*dy+dy*dy)
167#if 0 214#if 0
168// and has a max. error of 6 in the range -100..+100. 215// and has a max. error of 6 in the range -100..+100.
… …
262 { 309 {
263 sfree ((char *)p, s); 310 sfree ((char *)p, s);
264 } 311 }
265}; 312};
266 313
314// makes dynamically allocated objects zero-initialised
315struct slice_allocated
316{
317 void *operator new (size_t s, void *p)
318 {
319 return p;
320 }
321
322 void *operator new (size_t s)
323 {
324 return salloc<char> (s);
325 }
326
327 void *operator new[] (size_t s)
328 {
329 return salloc<char> (s);
330 }
331
332 void operator delete (void *p, size_t s)
333 {
334 sfree ((char *)p, s);
335 }
336
337 void operator delete[] (void *p, size_t s)
338 {
339 sfree ((char *)p, s);
340 }
341};
342
267// a STL-compatible allocator that uses g_slice 343// a STL-compatible allocator that uses g_slice
268// boy, this is verbose 344// boy, this is verbose
269template<typename Tp> 345template<typename Tp>
270struct slice_allocator 346struct slice_allocator
271{ 347{
… …
322// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. 398// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.
323// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps 399// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps
324// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps 400// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
325struct tausworthe_random_generator 401struct tausworthe_random_generator
326{ 402{
327 // generator
328 uint32_t state [4]; 403 uint32_t state [4];
329 404
330 void operator =(const tausworthe_random_generator &src) 405 void operator =(const tausworthe_random_generator &src)
331 { 406 {
332 state [0] = src.state [0]; 407 state [0] = src.state [0];
… …
335 state [3] = src.state [3]; 410 state [3] = src.state [3];
336 } 411 }
337 412
338 void seed (uint32_t seed); 413 void seed (uint32_t seed);
339 uint32_t next (); 414 uint32_t next ();
415};
340 416
341 // uniform distribution 417// Xorshift RNGs, George Marsaglia
418// http://www.jstatsoft.org/v08/i14/paper
419// this one is about 40% faster than the tausworthe one above (i.e. not much),
420// despite the inlining, and has the issue of only creating 2**32-1 numbers.
421// see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf
422struct xorshift_random_generator
423{
424 uint32_t x, y;
425
426 void operator =(const xorshift_random_generator &src)
427 {
428 x = src.x;
429 y = src.y;
430 }
431
432 void seed (uint32_t seed)
433 {
434 x = seed;
435 y = seed * 69069U;
436 }
437
438 uint32_t next ()
439 {
440 uint32_t t = x ^ (x << 10);
441 x = y;
442 y = y ^ (y >> 13) ^ t ^ (t >> 10);
443 return y;
444 }
445};
446
447template<class generator>
448struct random_number_generator : generator
449{
450 // uniform distribution, 0 .. max (0, num - 1)
342 uint32_t operator ()(uint32_t num) 451 uint32_t operator ()(uint32_t num)
343 { 452 {
344 return is_constant (num) 453 return !is_constant (num) ? get_range (num) // non-constant
345 ? (next () * (uint64_t)num) >> 32U 454 : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
346 : get_range (num); 455 : this->next () & (num - 1); // constant, power-of-two
347 } 456 }
348 457
349 // return a number within (min .. max) 458 // return a number within (min .. max)
350 int operator () (int r_min, int r_max) 459 int operator () (int r_min, int r_max)
351 { 460 {
… …
362protected: 471protected:
363 uint32_t get_range (uint32_t r_max); 472 uint32_t get_range (uint32_t r_max);
364 int get_range (int r_min, int r_max); 473 int get_range (int r_min, int r_max);
365}; 474};
366 475
367typedef tausworthe_random_generator rand_gen; 476typedef random_number_generator<tausworthe_random_generator> rand_gen;
368 477
369extern rand_gen rndm; 478extern rand_gen rndm, rmg_rndm;
370 479
371INTERFACE_CLASS (attachable) 480INTERFACE_CLASS (attachable)
372struct refcnt_base 481struct refcnt_base
373{ 482{
374 typedef int refcnt_t; 483 typedef int refcnt_t;
… …
441 550
442struct str_hash 551struct str_hash
443{ 552{
444 std::size_t operator ()(const char *s) const 553 std::size_t operator ()(const char *s) const
445 { 554 {
446 unsigned long hash = 0; 555#if 0
556 uint32_t hash = 0;
447 557
448 /* use the one-at-a-time hash function, which supposedly is 558 /* use the one-at-a-time hash function, which supposedly is
449 * better than the djb2-like one used by perl5.005, but 559 * better than the djb2-like one used by perl5.005, but
450 * certainly is better then the bug used here before. 560 * certainly is better then the bug used here before.
451 * see http://burtleburtle.net/bob/hash/doobs.html 561 * see http://burtleburtle.net/bob/hash/doobs.html
… …
458 } 568 }
459 569
460 hash += hash << 3; 570 hash += hash << 3;
461 hash ^= hash >> 11; 571 hash ^= hash >> 11;
462 hash += hash << 15; 572 hash += hash << 15;
573#else
574 // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
575 // it is about twice as fast as the one-at-a-time one,
576 // with good distribution.
577 // FNV-1a is faster on many cpus because the multiplication
578 // runs concurrent with the looping logic.
579 uint32_t hash = 2166136261;
580
581 while (*s)
582 hash = (hash ^ *s++) * 16777619;
583#endif
463 584
464 return hash; 585 return hash;
465 } 586 }
466}; 587};
467 588
… …
562 erase (&obj); 683 erase (&obj);
563 } 684 }
564}; 685};
565 686
566// basically does what strncpy should do, but appends "..." to strings exceeding length 687// basically does what strncpy should do, but appends "..." to strings exceeding length
688// returns the number of bytes actually used (including \0)
567void assign (char *dst, const char *src, int maxlen); 689int assign (char *dst, const char *src, int maxsize);
568 690
569// type-safe version of assign 691// type-safe version of assign
570template<int N> 692template<int N>
571inline void assign (char (&dst)[N], const char *src) 693inline int assign (char (&dst)[N], const char *src)
572{ 694{
573 assign ((char *)&dst, src, N); 695 return assign ((char *)&dst, src, N);
574} 696}
575 697
576typedef double tstamp; 698typedef double tstamp;
577 699
578// return current time as timestamp 700// return current time as timestamp
579tstamp now (); 701tstamp now ();
580 702
581int similar_direction (int a, int b); 703int similar_direction (int a, int b);
582 704
583// like sprintf, but returns a "static" buffer 705// like v?sprintf, but returns a "static" buffer
584const char *format (const char *format, ...); 706char *vformat (const char *format, va_list ap);
707char *format (const char *format, ...) attribute ((format (printf, 1, 2)));
708
709// safety-check player input which will become object->msg
710bool msg_is_safe (const char *msg);
585 711
586///////////////////////////////////////////////////////////////////////////// 712/////////////////////////////////////////////////////////////////////////////
587// threads, very very thin wrappers around pthreads 713// threads, very very thin wrappers around pthreads
588 714
589struct thread 715struct thread

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