+/* === S Y N F I G ========================================================= */
+/*! \file quick_rng.h
+** \brief Template Header
+**
+** $Id: guid.h 335 2007-03-16 00:39:09Z dooglus $
+**
+** \legal
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+** Copyright (c) 2007 Chris Moore
+**
+** This package 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 2 of
+** the License, or (at your option) any later version.
+**
+** This package 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.
+** \endlegal
+*/
+/* ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __SYNFIG_QUICK_RNG_H
+#define __SYNFIG_QUICK_RNG_H
+
+/* === H E A D E R S ======================================================= */
+
+#include <stdint.h>
+
+/* === M A C R O S ========================================================= */
+
+/* === T Y P E D E F S ===================================================== */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+// A fast 32-bit linear congruential random number generator
+class quick_rng
+{
+ uint32_t next;
+public:
+ quick_rng(uint32_t seed=0):next(seed) { }
+
+ void set_seed(uint32_t x)
+ {
+ next=x;
+ }
+
+ uint32_t i32()
+ {
+ static const uint32_t a(1664525);
+ static const uint32_t c(1013904223);
+
+ return next=next*a+c;
+ }
+
+ uint32_t i16()
+ {
+ return i32()>>16;
+ }
+
+ float f()
+ {
+ static const float m(int(65535));
+
+ return float(i16())/m;
+ }
+
+ uint32_t operator()(const uint32_t& m)
+ {
+ if(m==65536)
+ return i16();
+ else
+ if(m<=65536)
+ return i16()%m;
+ else
+ return i32()%m;
+ }
+};
+
+/* === E N D =============================================================== */
+
+#endif