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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.107 by root, Sun May 2 14:46:56 2010 UTC vs.
Revision 1.118 by root, Tue Jan 3 11:25:33 2012 UTC

 /*
  * This file is part of Deliantra, the Roguelike Realtime MMORPG.
  *
- * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
+ * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 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.
 void cleanup (const char *cause, bool make_core = false);
 void fork_abort (const char *msg);
 // rationale for using (U) not (T) is to reduce signed/unsigned issues,
 // as a is often a constant while b is the variable. it is still a bug, though.
-template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }
+template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
-template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }
+template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
 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; }
 template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
 template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
 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); }
 // sign0 returns -1, 0 or +1
 template<typename T>
 static inline T sign0 (T v) { return v ? sign (v) : 0; }
+//clashes with C++0x
 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)
 #else
   return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
 #endif
 }
+// can be substantially faster than floor, if your value range allows for it
+template<typename T>
+inline T
+fastfloor (T x)
+{
+   return std::floor (x);
+}
+inline float
+fastfloor (float x)
+{
+  return sint32(x) - (x < 0);
+}
+inline double
+fastfloor (double x)
+{
+  return sint64(x) - (x < 0);
+}
 /*
  * absdir(int): Returns a number between 1 and 8, which represent
  * the "absolute" direction of a number (it actually takes care of
  * "overflow" in previous calculations of a direction).
  */
   if (expect_true (ptr))
     {
       slice_alloc -= n * sizeof (T);
       if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
       g_slice_free1 (n * sizeof (T), (void *)ptr);
-      assert (slice_alloc >= 0);//D
     }
 }
 // nulls the pointer
 template<typename T>
   {
     p->~Tp ();
   }
 };
-// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.
+// basically a memory area, but refcounted
-// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps
+struct refcnt_buf
-// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
-struct tausworthe_random_generator
 {
-  uint32_t state [4];
+  char *data;
-  void operator =(const tausworthe_random_generator &src)
+  refcnt_buf (size_t size = 0);
-  {
+  refcnt_buf (void *data, size_t size);
-    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);
+  refcnt_buf (const refcnt_buf &src)
-  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;
+    data = src.data;
-    y = src.y;
+    ++_refcnt ();
   }
-  void seed (uint32_t seed)
+  ~refcnt_buf ();
-  {
-    x = seed;
-    y = seed * 69069U;
-  }
-  uint32_t next ()
+  refcnt_buf &operator =(const refcnt_buf &src);
+  operator char *()
   {
-    uint32_t t = x ^ (x << 10);
-    x = y;
-    y = y ^ (y >> 13) ^ t ^ (t >> 10);
-    return y;
+    return data;
   }
-};
-template<class generator>
+  size_t size () const
-struct random_number_generator : generator
-{
-  // uniform distribution, [0 .. num - 1]
-  uint32_t operator ()(uint32_t num)
   {
-    return !is_constant (num) ? get_range (num)                        // non-constant
+    return _size ();
-         : 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 the closed interval [min .. max]
-  int operator () (int r_min, int r_max)
-  {
-    return is_constant (r_min <= r_max) && r_min <= r_max
-              ? r_min + operator ()(r_max - r_min + 1)
-              : get_range (r_min, r_max);
-  }
-  // return a number within the half-open interval [0..1[
-  double operator ()()
-  {
-    return this->next () / (double)0x100000000;
   }
 protected:
-  uint32_t get_range (uint32_t r_max);
+  enum {
-  int get_range (int r_min, int r_max);
+    overhead = sizeof (unsigned int) * 2
-};
+  };
-typedef random_number_generator<tausworthe_random_generator> rand_gen;
+  unsigned int &_size () const
+  {
+    return ((unsigned int *)data)[-2];
+  }
-extern rand_gen rndm, rmg_rndm;
+  unsigned int &_refcnt () const
+  {
+    return ((unsigned int *)data)[-1];
+  }
+  void _alloc (unsigned int size)
+  {
+    data = ((char *)salloc<char> (size + overhead)) + overhead;
+    _size   () = size;
+    _refcnt () = 1;
+  }
+  void dec ()
+  {
+    if (!--_refcnt ())
+      sfree<char> (data - overhead, size () + overhead);
+  }
+};
 INTERFACE_CLASS (attachable)
 struct refcnt_base
 {
   typedef int refcnt_t;
   // 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.
+  // we modify the hash a bit to improve its distribution
   uint32_t hash = STRHSH_NULL;
   while (*s)
     hash = (hash ^ *s++) * 16777619U;
-  return hash;
+  return hash ^ (hash >> 16);
 }
 static inline uint32_t
 memhsh (const char *s, size_t len)
 {
   {
     erase (&obj);
   }
 };
+/////////////////////////////////////////////////////////////////////////////
+// something like a vector or stack, but without
+// out of bounds checking
+template<typename T>
+struct fixed_stack
+{
+  T *data;
+  int size;
+  int max;
+  fixed_stack ()
+  : size (0), data (0)
+  {
+  }
+  fixed_stack (int max)
+  : size (0), max (max)
+  {
+    data = salloc<T> (max);
+  }
+  void reset (int new_max)
+  {
+    sfree (data, max);
+    size = 0;
+    max = new_max;
+    data = salloc<T> (max);
+  }
+  void free ()
+  {
+    sfree (data, max);
+    data = 0;
+  }
+  ~fixed_stack ()
+  {
+    sfree (data, max);
+  }
+  T &operator[](int idx)
+  {
+    return data [idx];
+  }
+  void push (T v)
+  {
+    data [size++] = v;
+  }
+  T &pop ()
+  {
+    return data [--size];
+  }
+  T remove (int idx)
+  {
+    T v = data [idx];
+    data [idx] = data [--size];
+    return v;
+  }
+};
+/////////////////////////////////////////////////////////////////////////////
 // basically does what strncpy should do, but appends "..." to strings exceeding length
 // returns the number of bytes actually used (including \0)
 int assign (char *dst, const char *src, int maxsize);
 // type-safe version of assign

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Comparing deliantra/server/include/util.h (file contents): Revision 1.107 by root, Sun May 2 14:46:56 2010 UTC vs. Revision 1.118 by root, Tue Jan 3 11:25:33 2012 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.107 by root, Sun May 2 14:46:56 2010 UTC vs.
Revision 1.118 by root, Tue Jan 3 11:25:33 2012 UTC