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Comparing deliantra/server/include/util.h (file contents):
Revision 1.70 by root, Sun Apr 20 05:24:55 2008 UTC vs.
Revision 1.87 by root, Mon Jan 12 03:40:21 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
7 * it under the terms of the GNU General Public License as published by 7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or 8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version. 9 * (at your option) any later version.
… …
20 */ 20 */
21 21
22#ifndef UTIL_H__ 22#ifndef UTIL_H__
23#define UTIL_H__ 23#define UTIL_H__
24 24
25#define DEBUG_POISON 0xaa // poison memory before freeing it if != 0 25#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
26#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs 26#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
27#define PREFER_MALLOC 0 // use malloc and not the slice allocator 27#define PREFER_MALLOC 0 // use malloc and not the slice allocator
28 28
29#if __GNUC__ >= 3 29#if __GNUC__ >= 3
30# define is_constant(c) __builtin_constant_p (c) 30# define is_constant(c) __builtin_constant_p (c)
31# define expect(expr,value) __builtin_expect ((expr),(value)) 31# define expect(expr,value) __builtin_expect ((expr),(value))
32# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) 32# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
33# define noinline __attribute__((__noinline__))
33#else 34#else
34# define is_constant(c) 0 35# define is_constant(c) 0
35# define expect(expr,value) (expr) 36# define expect(expr,value) (expr)
36# define prefetch(addr,rw,locality) 37# define prefetch(addr,rw,locality)
38# define noinline
37#endif 39#endif
38 40
39#if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) 41#if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4)
40# define decltype(x) typeof(x) 42# define decltype(x) typeof(x)
41#endif 43#endif
42 44
43// put into ifs if you are very sure that the expression 45// put into ifs if you are very sure that the expression
44// is mostly true or mosty false. note that these return 46// is mostly true or mosty false. note that these return
45// booleans, not the expression. 47// booleans, not the expression.
46#define expect_false(expr) expect ((expr) != 0, 0) 48#define expect_false(expr) expect ((expr) ? 1 : 0, 0)
47#define expect_true(expr) expect ((expr) != 0, 1) 49#define expect_true(expr) expect ((expr) ? 1 : 0, 1)
48 50
49#include <pthread.h> 51#include <pthread.h>
50 52
51#include <cstddef> 53#include <cstddef>
52#include <cmath> 54#include <cmath>
… …
72#endif 74#endif
73 75
74// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) 76// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
75#define auto(var,expr) decltype(expr) var = (expr) 77#define auto(var,expr) decltype(expr) var = (expr)
76 78
77// very ugly macro that basicaly declares and initialises a variable 79// very ugly macro that basically declares and initialises a variable
78// that is in scope for the next statement only 80// that is in scope for the next statement only
79// works only for stuff that can be assigned 0 and converts to false 81// works only for stuff that can be assigned 0 and converts to false
80// (note: works great for pointers) 82// (note: works great for pointers)
81// most ugly macro I ever wrote 83// most ugly macro I ever wrote
82#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) 84#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. 98// 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; } 99template<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; } 100template<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; } 101template<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; }
100 102
103template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
104template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
105template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); }
106
101template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } 107template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
102 108
103template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } 109template<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)); } 110template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
105 111
112// sign returns -1 or +1
113template<typename T>
114static inline T sign (T v) { return v < 0 ? -1 : +1; }
115// relies on 2c representation
116template<>
117inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
118
119// sign0 returns -1, 0 or +1
120template<typename T>
121static inline T sign0 (T v) { return v ? sign (v) : 0; }
122
123// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
124template<typename T> static inline T div (T val, T div) { return (val + div / 2) / div; }
125// div, round-up
126template<typename T> static inline T div_ru (T val, T div) { return (val + div - 1) / div; }
127// div, round-down
128template<typename T> static inline T div_rd (T val, T div) { return (val ) / div; }
129
106template<typename T> 130template<typename T>
107static inline T 131static inline T
108lerp (T val, T min_in, T max_in, T min_out, T max_out) 132lerp (T val, T min_in, T max_in, T min_out, T max_out)
109{ 133{
110 return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; 134 return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
135}
136
137// lerp, round-down
138template<typename T>
139static inline T
140lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
141{
142 return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
143}
144
145// lerp, round-up
146template<typename T>
147static inline T
148lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
149{
150 return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
111} 151}
112 152
113// lots of stuff taken from FXT 153// lots of stuff taken from FXT
114 154
115/* Rotate right. This is used in various places for checksumming */ 155/* Rotate right. This is used in various places for checksumming */
… …
224 g_slice_free1 (n * sizeof (T), (void *)ptr); 264 g_slice_free1 (n * sizeof (T), (void *)ptr);
225 assert (slice_alloc >= 0);//D 265 assert (slice_alloc >= 0);//D
226 } 266 }
227} 267}
228 268
269// nulls the pointer
270template<typename T>
271inline void sfree0 (T *&ptr, int n = 1) throw ()
272{
273 sfree<T> (ptr, n);
274 ptr = 0;
275}
276
229// makes dynamically allocated objects zero-initialised 277// makes dynamically allocated objects zero-initialised
230struct zero_initialised 278struct zero_initialised
231{ 279{
232 void *operator new (size_t s, void *p) 280 void *operator new (size_t s, void *p)
233 { 281 {
… …
241 } 289 }
242 290
243 void *operator new[] (size_t s) 291 void *operator new[] (size_t s)
244 { 292 {
245 return salloc0<char> (s); 293 return salloc0<char> (s);
294 }
295
296 void operator delete (void *p, size_t s)
297 {
298 sfree ((char *)p, s);
299 }
300
301 void operator delete[] (void *p, size_t s)
302 {
303 sfree ((char *)p, s);
304 }
305};
306
307// makes dynamically allocated objects zero-initialised
308struct slice_allocated
309{
310 void *operator new (size_t s, void *p)
311 {
312 return p;
313 }
314
315 void *operator new (size_t s)
316 {
317 return salloc<char> (s);
318 }
319
320 void *operator new[] (size_t s)
321 {
322 return salloc<char> (s);
246 } 323 }
247 324
248 void operator delete (void *p, size_t s) 325 void operator delete (void *p, size_t s)
249 { 326 {
250 sfree ((char *)p, s); 327 sfree ((char *)p, s);
… …
314// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. 391// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.
315// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps 392// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps
316// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps 393// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
317struct tausworthe_random_generator 394struct tausworthe_random_generator
318{ 395{
319 // generator
320 uint32_t state [4]; 396 uint32_t state [4];
321 397
322 void operator =(const tausworthe_random_generator &src) 398 void operator =(const tausworthe_random_generator &src)
323 { 399 {
324 state [0] = src.state [0]; 400 state [0] = src.state [0];
… …
327 state [3] = src.state [3]; 403 state [3] = src.state [3];
328 } 404 }
329 405
330 void seed (uint32_t seed); 406 void seed (uint32_t seed);
331 uint32_t next (); 407 uint32_t next ();
408};
332 409
333 // uniform distribution 410// Xorshift RNGs, George Marsaglia
411// http://www.jstatsoft.org/v08/i14/paper
412// this one is about 40% faster than the tausworthe one above (i.e. not much),
413// despite the inlining, and has the issue of only creating 2**32-1 numbers.
414// see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf
415struct xorshift_random_generator
416{
417 uint32_t x, y;
418
419 void operator =(const xorshift_random_generator &src)
420 {
421 x = src.x;
422 y = src.y;
423 }
424
425 void seed (uint32_t seed)
426 {
427 x = seed;
428 y = seed * 69069U;
429 }
430
431 uint32_t next ()
432 {
433 uint32_t t = x ^ (x << 10);
434 x = y;
435 y = y ^ (y >> 13) ^ t ^ (t >> 10);
436 return y;
437 }
438};
439
440template<class generator>
441struct random_number_generator : generator
442{
443 // uniform distribution, 0 .. max (0, num - 1)
334 uint32_t operator ()(uint32_t num) 444 uint32_t operator ()(uint32_t num)
335 { 445 {
336 return is_constant (num) 446 return !is_constant (num) ? get_range (num) // non-constant
337 ? (next () * (uint64_t)num) >> 32U 447 : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
338 : get_range (num); 448 : this->next () & (num - 1); // constant, power-of-two
339 } 449 }
340 450
341 // return a number within (min .. max) 451 // return a number within (min .. max)
342 int operator () (int r_min, int r_max) 452 int operator () (int r_min, int r_max)
343 { 453 {
… …
354protected: 464protected:
355 uint32_t get_range (uint32_t r_max); 465 uint32_t get_range (uint32_t r_max);
356 int get_range (int r_min, int r_max); 466 int get_range (int r_min, int r_max);
357}; 467};
358 468
359typedef tausworthe_random_generator rand_gen; 469typedef random_number_generator<tausworthe_random_generator> rand_gen;
360 470
361extern rand_gen rndm; 471extern rand_gen rndm, rmg_rndm;
362 472
363INTERFACE_CLASS (attachable) 473INTERFACE_CLASS (attachable)
364struct refcnt_base 474struct refcnt_base
365{ 475{
366 typedef int refcnt_t; 476 typedef int refcnt_t;
… …
433 543
434struct str_hash 544struct str_hash
435{ 545{
436 std::size_t operator ()(const char *s) const 546 std::size_t operator ()(const char *s) const
437 { 547 {
438 unsigned long hash = 0; 548#if 0
549 uint32_t hash = 0;
439 550
440 /* use the one-at-a-time hash function, which supposedly is 551 /* use the one-at-a-time hash function, which supposedly is
441 * better than the djb2-like one used by perl5.005, but 552 * better than the djb2-like one used by perl5.005, but
442 * certainly is better then the bug used here before. 553 * certainly is better then the bug used here before.
443 * see http://burtleburtle.net/bob/hash/doobs.html 554 * see http://burtleburtle.net/bob/hash/doobs.html
… …
450 } 561 }
451 562
452 hash += hash << 3; 563 hash += hash << 3;
453 hash ^= hash >> 11; 564 hash ^= hash >> 11;
454 hash += hash << 15; 565 hash += hash << 15;
566#else
567 // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
568 // it is about twice as fast as the one-at-a-time one,
569 // with good distribution.
570 // FNV-1a is faster on many cpus because the multiplication
571 // runs concurrent with the looping logic.
572 uint32_t hash = 2166136261;
573
574 while (*s)
575 hash = (hash ^ *s++) * 16777619;
576#endif
455 577
456 return hash; 578 return hash;
457 } 579 }
458}; 580};
459 581
… …
554 erase (&obj); 676 erase (&obj);
555 } 677 }
556}; 678};
557 679
558// basically does what strncpy should do, but appends "..." to strings exceeding length 680// basically does what strncpy should do, but appends "..." to strings exceeding length
681// returns the number of bytes actually used (including \0)
559void assign (char *dst, const char *src, int maxlen); 682int assign (char *dst, const char *src, int maxsize);
560 683
561// type-safe version of assign 684// type-safe version of assign
562template<int N> 685template<int N>
563inline void assign (char (&dst)[N], const char *src) 686inline int assign (char (&dst)[N], const char *src)
564{ 687{
565 assign ((char *)&dst, src, N); 688 return assign ((char *)&dst, src, N);
566} 689}
567 690
568typedef double tstamp; 691typedef double tstamp;
569 692
570// return current time as timestamp 693// return current time as timestamp

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