[ViewVC] Diff of: cvs/deliantra/server/include/util.h

Comparing deliantra/server/include/util.h (file contents):
Revision 1.94 by root, Sun Nov 8 16:13:45 2009 UTC vs.
Revision 1.110 by root, Fri Jul 2 02:00:47 2010 UTC

 /*
  * This file is part of Deliantra, the Roguelike Realtime MMORPG.
  *
- * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
+ * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
  *
  * Deliantra is free software: you can redistribute it and/or modify it under
  * the terms of the Affero GNU General Public License as published by the
  * Free Software Foundation, either version 3 of the License, or (at your
  * option) any later version.
 #endif
 // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
 #define auto(var,expr) decltype(expr) var = (expr)
+#if cplusplus_does_not_suck
+// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
+template<typename T, int N>
+static inline int array_length (const T (&arr)[N])
+{
+  return N;
+}
+#else
+#define array_length(name) (sizeof (name) / sizeof (name [0]))
+#endif
 // very ugly macro that basically declares and initialises a variable
 // that is in scope for the next statement only
 // works only for stuff that can be assigned 0 and converts to false
 // (note: works great for pointers)
 // most ugly macro I ever wrote
 // sign returns -1 or +1
 template<typename T>
 static inline T sign (T v) { return v < 0 ? -1 : +1; }
 // relies on 2c representation
 template<>
-inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
+inline sint8  sign (sint8  v) { return 1 - (sint8  (uint8  (v) >>  7) * 2); }
+template<>
+inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); }
+template<>
+inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); }
 // sign0 returns -1, 0 or +1
 template<typename T>
 static inline T sign0 (T v) { return v ? sign (v) : 0; }
+template<typename T, typename U>
+static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
 // div* only work correctly for div > 0
 // div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
 template<typename T> static inline T div    (T val, T div)
 {
   return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
 }
+template<> inline float  div (float  val, float  div) { return val / div; }
+template<> inline double div (double val, double div) { return val / div; }
 // div, round-up
 template<typename T> static inline T div_ru (T val, T div)
 {
   return expect_false (val < 0) ? - ((-val                ) / div) : (val + div - 1) / div;
 }
 absdir (int d)
 {
   return ((d - 1) & 7) + 1;
 }
+// avoid ctz name because netbsd or freebsd spams it's namespace with it
+#if GCC_VERSION(3,4)
+static inline int least_significant_bit (uint32_t x)
+{
+  return __builtin_ctz (x);
+}
+#else
+int least_significant_bit (uint32_t x);
+#endif
+#define for_all_bits_sparse_32(mask, idxvar)      \
+  for (uint32_t idxvar, mask_ = mask;   \
+       mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
 extern ssize_t slice_alloc; // statistics
 void *salloc_ (int n)            throw (std::bad_alloc);
 void *salloc_ (int n, void *src) throw (std::bad_alloc);
   {
     p->~Tp ();
   }
 };
-// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.
-// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps
-// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
-struct tausworthe_random_generator
-{
-  uint32_t state [4];
-  void operator =(const tausworthe_random_generator &src)
-  {
-    state [0] = src.state [0];
-    state [1] = src.state [1];
-    state [2] = src.state [2];
-    state [3] = src.state [3];
-  }
-  void seed (uint32_t seed);
-  uint32_t next ();
-};
-// Xorshift RNGs, George Marsaglia
-// http://www.jstatsoft.org/v08/i14/paper
-// this one is about 40% faster than the tausworthe one above (i.e. not much),
-// despite the inlining, and has the issue of only creating 2**32-1 numbers.
-// see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf
-struct xorshift_random_generator
-{
-  uint32_t x, y;
-  void operator =(const xorshift_random_generator &src)
-  {
-    x = src.x;
-    y = src.y;
-  }
-  void seed (uint32_t seed)
-  {
-    x = seed;
-    y = seed * 69069U;
-  }
-  uint32_t next ()
-  {
-    uint32_t t = x ^ (x << 10);
-    x = y;
-    y = y ^ (y >> 13) ^ t ^ (t >> 10);
-    return y;
-  }
-};
-template<class generator>
-struct random_number_generator : generator
-{
-  // uniform distribution, 0 .. max (0, num - 1)
-  uint32_t operator ()(uint32_t num)
-  {
-    return !is_constant (num) ? get_range (num)                        // non-constant
-         : num & (num - 1)    ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
-         :                      this->next () & (num - 1);             // constant, power-of-two
-  }
-  // return a number within (min .. max)
-  int operator () (int r_min, int r_max)
-  {
-    return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
-              ? r_min + operator ()(r_max - r_min + 1)
-              : get_range (r_min, r_max);
-  }
-  double operator ()()
-  {
-    return this->next () / (double)0xFFFFFFFFU;
-  }
-protected:
-  uint32_t get_range (uint32_t r_max);
-  int get_range (int r_min, int r_max);
-};
-typedef random_number_generator<tausworthe_random_generator> rand_gen;
-extern rand_gen rndm, rmg_rndm;
 INTERFACE_CLASS (attachable)
 struct refcnt_base
 {
   typedef int refcnt_t;
   mutable refcnt_t ACC (RW, refcnt);
 typedef refptr<maptile>   maptile_ptr;
 typedef refptr<object>    object_ptr;
 typedef refptr<archetype> arch_ptr;
 typedef refptr<client>    client_ptr;
 typedef refptr<player>    player_ptr;
+typedef refptr<region>    region_ptr;
+#define STRHSH_NULL 2166136261
+static inline uint32_t
+strhsh (const char *s)
+{
+  // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
+  // it is about twice as fast as the one-at-a-time one,
+  // with good distribution.
+  // FNV-1a is faster on many cpus because the multiplication
+  // runs concurrently with the looping logic.
+  uint32_t hash = STRHSH_NULL;
+  while (*s)
+    hash = (hash ^ *s++) * 16777619U;
+  return hash;
+}
+static inline uint32_t
+memhsh (const char *s, size_t len)
+{
+  uint32_t hash = STRHSH_NULL;
+  while (len--)
+    hash = (hash ^ *s++) * 16777619U;
+  return hash;
+}
 struct str_hash
 {
   std::size_t operator ()(const char *s) const
   {
-#if 0
-    uint32_t hash = 0;
-    /* use the one-at-a-time hash function, which supposedly is
-     * better than the djb2-like one used by perl5.005, but
-     * certainly is better then the bug used here before.
-     * see http://burtleburtle.net/bob/hash/doobs.html
-     */
-    while (*s)
-      {
-        hash += *s++;
-        hash += hash << 10;
-        hash ^= hash >>  6;
-      }
-    hash += hash <<  3;
-    hash ^= hash >> 11;
-    hash += hash << 15;
-#else
-    // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
-    // it is about twice as fast as the one-at-a-time one,
-    // with good distribution.
-    // FNV-1a is faster on many cpus because the multiplication
-    // runs concurrent with the looping logic.
-    uint32_t hash = 2166136261;
-    while (*s)
-      hash = (hash ^ *s++) * 16777619;
-#endif
-    return hash;
+    return strhsh (s);
+  }
+  std::size_t operator ()(const shstr &s) const
+  {
+    return strhsh (s);
   }
 };
 struct str_equal
 {

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Comparing deliantra/server/include/util.h (file contents): Revision 1.94 by root, Sun Nov 8 16:13:45 2009 UTC vs. Revision 1.110 by root, Fri Jul 2 02:00:47 2010 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.94 by root, Sun Nov 8 16:13:45 2009 UTC vs.
Revision 1.110 by root, Fri Jul 2 02:00:47 2010 UTC