--- deliantra/server/include/util.h 2006/12/21 06:12:36 1.21
+++ deliantra/server/include/util.h 2007/07/13 15:54:40 1.53
@@ -1,18 +1,178 @@
+/*
+ * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
+ *
+ * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
+ *
+ * Crossfire TRT is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ *
+ * The authors can be reached via e-mail to
+ */
+
#ifndef UTIL_H__
#define UTIL_H__
+//#define PREFER_MALLOC
+
#if __GNUC__ >= 3
-# define is_constant(c) __builtin_constant_p (c)
+# define is_constant(c) __builtin_constant_p (c)
+# define expect(expr,value) __builtin_expect ((expr),(value))
+# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
#else
-# define is_constant(c) 0
+# define is_constant(c) 0
+# define expect(expr,value) (expr)
+# define prefetch(addr,rw,locality)
+#endif
+
+#if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4)
+# define decltype(x) typeof(x)
#endif
+// put into ifs if you are very sure that the expression
+// is mostly true or mosty false. note that these return
+// booleans, not the expression.
+#define expect_false(expr) expect ((expr) != 0, 0)
+#define expect_true(expr) expect ((expr) != 0, 1)
+
#include
+#include
+#include
+#include
#include
-// use a gcc extension for auto declarations until ISO C++ sanctifies them
-#define AUTODECL(var,expr) typeof(expr) var = (expr)
+#include
+#include
+
+// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
+#define auto(var,expr) decltype(expr) var = (expr)
+
+// very ugly macro that basicaly 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
+#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
+
+// in range including end
+#define IN_RANGE_INC(val,beg,end) \
+ ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
+
+// in range excluding end
+#define IN_RANGE_EXC(val,beg,end) \
+ ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))
+
+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 static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }
+template static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }
+template static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; }
+
+template static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
+
+template
+static inline T
+lerp (T val, T min_in, T max_in, T min_out, T max_out)
+{
+ return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out;
+}
+
+// lots of stuff taken from FXT
+
+/* Rotate right. This is used in various places for checksumming */
+//TODO: that sucks, use a better checksum algo
+static inline uint32_t
+rotate_right (uint32_t c, uint32_t count = 1)
+{
+ return (c << (32 - count)) | (c >> count);
+}
+
+static inline uint32_t
+rotate_left (uint32_t c, uint32_t count = 1)
+{
+ return (c >> (32 - count)) | (c << count);
+}
+
+// Return abs(a-b)
+// Both a and b must not have the most significant bit set
+static inline uint32_t
+upos_abs_diff (uint32_t a, uint32_t b)
+{
+ long d1 = b - a;
+ long d2 = (d1 & (d1 >> 31)) << 1;
+
+ return d1 - d2; // == (b - d) - (a + d);
+}
+
+// Both a and b must not have the most significant bit set
+static inline uint32_t
+upos_min (uint32_t a, uint32_t b)
+{
+ int32_t d = b - a;
+ d &= d >> 31;
+ return a + d;
+}
+
+// Both a and b must not have the most significant bit set
+static inline uint32_t
+upos_max (uint32_t a, uint32_t b)
+{
+ int32_t d = b - a;
+ d &= d >> 31;
+ return b - d;
+}
+
+// this is much faster than crossfires original algorithm
+// on modern cpus
+inline int
+isqrt (int n)
+{
+ return (int)sqrtf ((float)n);
+}
+
+// this is only twice as fast as naive sqrtf (dx*dy+dy*dy)
+#if 0
+// and has a max. error of 6 in the range -100..+100.
+#else
+// and has a max. error of 9 in the range -100..+100.
+#endif
+inline int
+idistance (int dx, int dy)
+{
+ unsigned int dx_ = abs (dx);
+ unsigned int dy_ = abs (dy);
+
+#if 0
+ return dx_ > dy_
+ ? (dx_ * 61685 + dy_ * 26870) >> 16
+ : (dy_ * 61685 + dx_ * 26870) >> 16;
+#else
+ return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
+#endif
+}
+
+/*
+ * 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).
+ */
+inline int
+absdir (int d)
+{
+ return ((d - 1) & 7) + 1;
+}
// makes dynamically allocated objects zero-initialised
struct zero_initialised
@@ -64,7 +224,11 @@
template
inline void sfree (T *ptr, int n = 1) throw ()
{
+#ifdef PREFER_MALLOC
+ free (ptr);
+#else
g_slice_free1 (n * sizeof (T), (void *)ptr);
+#endif
}
// a STL-compatible allocator that uses g_slice
@@ -122,21 +286,55 @@
}
};
-struct refcounted
+// 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
{
- refcounted () : refcnt (0) { }
-// virtual ~refcounted ();
- void refcnt_inc () { ++refcnt; }
- void refcnt_dec () { --refcnt; }
- bool dead () { return refcnt == 0; }
- mutable int refcnt;
-#if 0
-private:
- static refcounted *rc_first;
- refcounted *rc_next;
-#endif
+ // 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 ();
+
+ // uniform distribution
+ uint32_t operator ()(uint32_t num)
+ {
+ return is_constant (num)
+ ? (next () * (uint64_t)num) >> 32U
+ : get_range (num);
+ }
+
+ // 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 tausworthe_random_generator rand_gen;
+
+extern rand_gen rndm;
+
template
struct refptr
{
@@ -168,6 +366,12 @@
operator T *() const { return p; }
};
+typedef refptr maptile_ptr;
+typedef refptr