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 (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
4 | * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
5 | * |
5 | * |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
7 | * the terms of the Affero GNU General Public License as published by the |
7 | * the terms of the Affero GNU General Public License as published by the |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
9 | * 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 Affero GNU General Public License |
16 | * You should have received a copy of the Affero GNU General Public License |
17 | * and the GNU General Public License along with this program. If not, see |
17 | * and the GNU General Public License along with this program. If not, see |
18 | * <http://www.gnu.org/licenses/>. |
18 | * <http://www.gnu.org/licenses/>. |
19 | * |
19 | * |
20 | * 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> |
21 | */ |
21 | */ |
22 | |
22 | |
23 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
24 | #define UTIL_H__ |
24 | #define UTIL_H__ |
… | |
… | |
55 | #endif |
55 | #endif |
56 | |
56 | |
57 | // 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) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
59 | |
59 | |
60 | #if cplusplus_does_not_suck |
60 | #if cplusplus_does_not_suck /* still sucks in codesize with gcc 6, although local types work now */ |
61 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
61 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
62 | template<typename T, int N> |
62 | template<typename T, int N> |
63 | static inline int array_length (const T (&arr)[N]) |
63 | static inline int array_length (const T (&arr)[N]) |
64 | { |
64 | { |
65 | return N; |
65 | return N; |
… | |
… | |
86 | void cleanup (const char *cause, bool make_core = false); |
86 | void cleanup (const char *cause, bool make_core = false); |
87 | void fork_abort (const char *msg); |
87 | void fork_abort (const char *msg); |
88 | |
88 | |
89 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
89 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
90 | // 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. |
91 | 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 a < (T)b ? a : (T)b; } |
92 | 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 a > (T)b ? a : (T)b; } |
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; } |
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; } |
94 | |
94 | |
95 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
95 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
96 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
96 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
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); } |
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); } |
… | |
… | |
237 | #if 0 |
237 | #if 0 |
238 | // and has a max. error of 6 in the range -100..+100. |
238 | // and has a max. error of 6 in the range -100..+100. |
239 | #else |
239 | #else |
240 | // and has a max. error of 9 in the range -100..+100. |
240 | // and has a max. error of 9 in the range -100..+100. |
241 | #endif |
241 | #endif |
242 | inline int |
242 | inline int |
243 | idistance (int dx, int dy) |
243 | idistance (int dx, int dy) |
244 | { |
244 | { |
245 | unsigned int dx_ = abs (dx); |
245 | unsigned int dx_ = abs (dx); |
246 | unsigned int dy_ = abs (dy); |
246 | unsigned int dy_ = abs (dy); |
247 | |
247 | |
248 | #if 0 |
248 | #if 0 |
249 | return dx_ > dy_ |
249 | return dx_ > dy_ |
… | |
… | |
252 | #else |
252 | #else |
253 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
253 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
254 | #endif |
254 | #endif |
255 | } |
255 | } |
256 | |
256 | |
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257 | // can be substantially faster than floor, if your value range allows for it |
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258 | template<typename T> |
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259 | inline T |
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260 | fastfloor (T x) |
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261 | { |
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262 | return std::floor (x); |
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263 | } |
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264 | |
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265 | inline float |
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266 | fastfloor (float x) |
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267 | { |
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268 | return sint32(x) - (x < 0); |
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269 | } |
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270 | |
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271 | inline double |
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272 | fastfloor (double x) |
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273 | { |
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274 | return sint64(x) - (x < 0); |
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275 | } |
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276 | |
257 | /* |
277 | /* |
258 | * absdir(int): Returns a number between 1 and 8, which represent |
278 | * absdir(int): Returns a number between 1 and 8, which represent |
259 | * the "absolute" direction of a number (it actually takes care of |
279 | * the "absolute" direction of a number (it actually takes care of |
260 | * "overflow" in previous calculations of a direction). |
280 | * "overflow" in previous calculations of a direction). |
261 | */ |
281 | */ |
… | |
… | |
304 | if (expect_true (ptr)) |
324 | if (expect_true (ptr)) |
305 | { |
325 | { |
306 | slice_alloc -= n * sizeof (T); |
326 | slice_alloc -= n * sizeof (T); |
307 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
327 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
308 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
328 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
309 | assert (slice_alloc >= 0);//D |
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310 | } |
329 | } |
311 | } |
330 | } |
312 | |
331 | |
313 | // nulls the pointer |
332 | // nulls the pointer |
314 | template<typename T> |
333 | template<typename T> |
… | |
… | |
388 | typedef const Tp *const_pointer; |
407 | typedef const Tp *const_pointer; |
389 | typedef Tp &reference; |
408 | typedef Tp &reference; |
390 | typedef const Tp &const_reference; |
409 | typedef const Tp &const_reference; |
391 | typedef Tp value_type; |
410 | typedef Tp value_type; |
392 | |
411 | |
393 | template <class U> |
412 | template <class U> |
394 | struct rebind |
413 | struct rebind |
395 | { |
414 | { |
396 | typedef slice_allocator<U> other; |
415 | typedef slice_allocator<U> other; |
397 | }; |
416 | }; |
398 | |
417 | |
… | |
… | |
427 | } |
446 | } |
428 | |
447 | |
429 | void destroy (pointer p) |
448 | void destroy (pointer p) |
430 | { |
449 | { |
431 | p->~Tp (); |
450 | p->~Tp (); |
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451 | } |
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452 | }; |
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453 | |
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454 | // basically a memory area, but refcounted |
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455 | struct refcnt_buf |
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456 | { |
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457 | char *data; |
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458 | |
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459 | refcnt_buf (size_t size = 0); |
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460 | refcnt_buf (void *data, size_t size); |
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461 | |
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462 | refcnt_buf (const refcnt_buf &src) |
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463 | { |
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464 | data = src.data; |
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465 | inc (); |
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466 | } |
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467 | |
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468 | ~refcnt_buf (); |
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469 | |
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470 | refcnt_buf &operator =(const refcnt_buf &src); |
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471 | |
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472 | operator char *() |
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473 | { |
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474 | return data; |
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475 | } |
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476 | |
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477 | size_t size () const |
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478 | { |
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479 | return _size (); |
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480 | } |
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481 | |
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482 | protected: |
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483 | enum { |
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484 | overhead = sizeof (uint32_t) * 2 |
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485 | }; |
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486 | |
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487 | uint32_t &_size () const |
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488 | { |
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489 | return ((unsigned int *)data)[-2]; |
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490 | } |
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491 | |
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492 | uint32_t &_refcnt () const |
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493 | { |
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494 | return ((unsigned int *)data)[-1]; |
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495 | } |
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496 | |
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497 | void _alloc (uint32_t size) |
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498 | { |
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499 | data = ((char *)salloc<char> (size + overhead)) + overhead; |
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500 | _size () = size; |
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501 | _refcnt () = 1; |
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502 | } |
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503 | |
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504 | void _dealloc (); |
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505 | |
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506 | void inc () |
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507 | { |
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508 | ++_refcnt (); |
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509 | } |
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510 | |
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511 | void dec () |
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512 | { |
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513 | if (!--_refcnt ()) |
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514 | _dealloc (); |
432 | } |
515 | } |
433 | }; |
516 | }; |
434 | |
517 | |
435 | INTERFACE_CLASS (attachable) |
518 | INTERFACE_CLASS (attachable) |
436 | struct refcnt_base |
519 | struct refcnt_base |
… | |
… | |
514 | // with good distribution. |
597 | // with good distribution. |
515 | // FNV-1a is faster on many cpus because the multiplication |
598 | // FNV-1a is faster on many cpus because the multiplication |
516 | // runs concurrently with the looping logic. |
599 | // runs concurrently with the looping logic. |
517 | // we modify the hash a bit to improve its distribution |
600 | // we modify the hash a bit to improve its distribution |
518 | uint32_t hash = STRHSH_NULL; |
601 | uint32_t hash = STRHSH_NULL; |
519 | |
602 | |
520 | while (*s) |
603 | while (*s) |
521 | hash = (hash ^ *s++) * 16777619U; |
604 | hash = (hash ^ *s++) * 16777619U; |
522 | |
605 | |
523 | return hash ^ (hash >> 16); |
606 | return hash ^ (hash >> 16); |
524 | } |
607 | } |
525 | |
608 | |
526 | static inline uint32_t |
609 | static inline uint32_t |
527 | memhsh (const char *s, size_t len) |
610 | memhsh (const char *s, size_t len) |
528 | { |
611 | { |
529 | uint32_t hash = STRHSH_NULL; |
612 | uint32_t hash = STRHSH_NULL; |
530 | |
613 | |
531 | while (len--) |
614 | while (len--) |
532 | hash = (hash ^ *s++) * 16777619U; |
615 | hash = (hash ^ *s++) * 16777619U; |
533 | |
616 | |
534 | return hash; |
617 | return hash; |
535 | } |
618 | } |
… | |
… | |
578 | } |
661 | } |
579 | }; |
662 | }; |
580 | |
663 | |
581 | // This container blends advantages of linked lists |
664 | // This container blends advantages of linked lists |
582 | // (efficiency) with vectors (random access) by |
665 | // (efficiency) with vectors (random access) by |
583 | // by using an unordered vector and storing the vector |
666 | // using an unordered vector and storing the vector |
584 | // index inside the object. |
667 | // index inside the object. |
585 | // |
668 | // |
586 | // + memory-efficient on most 64 bit archs |
669 | // + memory-efficient on most 64 bit archs |
587 | // + O(1) insert/remove |
670 | // + O(1) insert/remove |
588 | // + free unique (but varying) id for inserted objects |
671 | // + free unique (but varying) id for inserted objects |
… | |
… | |
625 | insert (&obj); |
708 | insert (&obj); |
626 | } |
709 | } |
627 | |
710 | |
628 | void erase (T *obj) |
711 | void erase (T *obj) |
629 | { |
712 | { |
630 | unsigned int pos = obj->*indexmember; |
713 | object_vector_index pos = obj->*indexmember; |
631 | obj->*indexmember = 0; |
714 | obj->*indexmember = 0; |
632 | |
715 | |
633 | if (pos < this->size ()) |
716 | if (pos < this->size ()) |
634 | { |
717 | { |
635 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
718 | (*this)[pos - 1] = (*this)[this->size () - 1]; |