00001 00002 /* 00003 pbrt source code Copyright(c) 1998-2010 Matt Pharr and Greg Humphreys. 00004 00005 This file is part of pbrt. 00006 00007 pbrt is free software; you can redistribute it and/or modify 00008 it under the terms of the GNU General Public License as published by 00009 the Free Software Foundation; either version 2 of the License, or 00010 (at your option) any later version. Note that the text contents of 00011 the book "Physically Based Rendering" are *not* licensed under the 00012 GNU GPL. 00013 00014 pbrt is distributed in the hope that it will be useful, 00015 but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00017 GNU General Public License for more details. 00018 00019 You should have received a copy of the GNU General Public License 00020 along with this program. If not, see <http://www.gnu.org/licenses/>. 00021 00022 */ 00023 00024 #if defined(_MSC_VER) 00025 #pragma once 00026 #endif 00027 00028 #ifndef PBRT_CORE_RNG_H 00029 #define PBRT_CORE_RNG_H 00030 00031 // core/rng.h* 00032 #include "pbrt.h" 00033 #include "probes.h" 00034 00035 // Random Number Declarations 00036 class RNG { 00037 public: 00038 RNG(uint32_t seed = 5489UL) { 00039 mti = N+1; /* mti==N+1 means mt[N] is not initialized */ 00040 Seed(seed); 00041 } 00042 00043 void Seed(uint32_t seed) const; 00044 float RandomFloat() const; 00045 unsigned long RandomUInt() const; 00046 00047 private: 00048 static const int N = 624; 00049 mutable unsigned long mt[N]; /* the array for the state vector */ 00050 mutable int mti; 00051 }; 00052 00053 00054 00055 #endif // PBRT_CORE_RNG_H