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116 lines
3.7 KiB
C++
116 lines
3.7 KiB
C++
// ==============================================================
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// This file is part of MegaGlest Shared Library (www.megaglest.org)
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//
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// Copyright (C) 2012 Mark Vejvoda, Titus Tscharntke
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// 2001-2008 Martiño Figueroa
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//
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// You can redistribute this code and/or modify it under
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// the terms of the GNU General Public License as published
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// by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version
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// ==============================================================
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#include "randomgen.h"
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#include <cassert>
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#include "util.h"
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#include <stdexcept>
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#include "platform_util.h"
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#include "leak_dumper.h"
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using namespace std;
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namespace Shared { namespace Util {
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// =====================================================
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// class RandomGen
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// =====================================================
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const int RandomGen::m= 714025;
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const int RandomGen::a= 1366;
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const int RandomGen::b= 150889;
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RandomGen::RandomGen(){
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//#ifdef USE_STREFLOP
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// lastNumber = streflop::RandomInit(0); // streflop
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//#else
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lastNumber= 0;
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//#endif
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//SystemFlags::OutputDebug(SystemFlags::debugSystem,"In [%s::%s Line: %d] lastNumber = %d\n",__FILE__,__FUNCTION__,__LINE__,lastNumber);
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}
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void RandomGen::init(int seed){
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//#ifdef USE_STREFLOP
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// lastNumber = streflop::RandomInit(seed); // streflop
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//#else
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lastNumber= seed % m;
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//#endif
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//SystemFlags::OutputDebug(SystemFlags::debugSystem,"In [%s::%s Line: %d] seed = %d, lastNumber = %d\n",__FILE__,__FUNCTION__,__LINE__,seed,lastNumber);
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}
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int RandomGen::rand() {
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//SystemFlags::OutputDebug(SystemFlags::debugSystem,"In [%s::%s Line: %d] lastNumber = %d\n",__FILE__,__FUNCTION__,__LINE__,lastNumber);
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lastNumber= (a*lastNumber + b) % m;
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//SystemFlags::OutputDebug(SystemFlags::debugSystem,"In [%s::%s Line: %d] lastNumber = %d\n",__FILE__,__FUNCTION__,__LINE__,lastNumber);
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return lastNumber;
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}
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int RandomGen::randRange(int min, int max){
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assert(min<=max);
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if(min > max) {
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char szBuf[1024]="";
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sprintf(szBuf,"In [%s::%s Line: %d] min > max, min = %d, max = %d",__FILE__,__FUNCTION__,__LINE__,min,max);
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throw megaglest_runtime_error(szBuf);
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}
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//#ifdef USE_STREFLOP
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// int res = streflop::Random<true, false, float>(min, max); // streflop
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//#else
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int diff= max-min;
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int res= min + static_cast<int>(static_cast<float>(diff+1)*RandomGen::rand() / m);
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//#endif
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assert(res>=min && res<=max);
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if(res < min || res > max) {
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char szBuf[1024]="";
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sprintf(szBuf,"In [%s::%s Line: %d] res < min || res > max, min = %d, max = %d, res = %d",__FILE__,__FUNCTION__,__LINE__,min,max,res);
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throw megaglest_runtime_error(szBuf);
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}
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//SystemFlags::OutputDebug(SystemFlags::debugSystem,"In [%s::%s Line: %d] min = %d, max = %d, res = %d\n",__FILE__,__FUNCTION__,__LINE__,min,max,res);
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return res;
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}
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float RandomGen::randRange(float min, float max){
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assert(min<=max);
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if(min > max) {
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char szBuf[1024]="";
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sprintf(szBuf,"In [%s::%s Line: %d] min > max, min = %f, max = %f",__FILE__,__FUNCTION__,__LINE__,min,max);
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throw megaglest_runtime_error(szBuf);
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}
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//#ifdef USE_STREFLOP
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// float res = streflop::Random<true, false, float>(min, max, randomState); // streflop
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//#else
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float rand01= static_cast<float>(RandomGen::rand())/(m-1);
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float res= min+(max-min)*rand01;
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//#endif
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assert(res>=min && res<=max);
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if(res < min || res > max) {
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char szBuf[1024]="";
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sprintf(szBuf,"In [%s::%s Line: %d] res < min || res > max, min = %f, max = %f, res = %f",__FILE__,__FUNCTION__,__LINE__,min,max,res);
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throw megaglest_runtime_error(szBuf);
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}
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//SystemFlags::OutputDebug(SystemFlags::debugSystem,"In [%s::%s Line: %d] min = %f, max = %f, res = %f\n",__FILE__,__FUNCTION__,__LINE__,min,max,res);
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return res;
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}
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}}//end namespace
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