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Fog.cpp

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00001 //------------------------------------------------------------------------------
00002 // Lamp : Open source game middleware
00003 // Copyright (C) 2004  Junpei Ohtani ( Email : junpee@users.sourceforge.jp )
00004 //
00005 // This library is free software; you can redistribute it and/or
00006 // modify it under the terms of the GNU Lesser General Public
00007 // License as published by the Free Software Foundation; either
00008 // version 2.1 of the License, or (at your option) any later version.
00009 //
00010 // This library is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013 // Lesser General Public License for more details.
00014 //
00015 // You should have received a copy of the GNU Lesser General Public
00016 // License along with this library; if not, write to the Free Software
00017 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00018 //------------------------------------------------------------------------------
00019 
00020 /** @file
00021  * フォグ実装
00022  * @author Junpee
00023  */
00024 
00025 #include "LampBasic.h"
00026 #include "Graphics/Fog/Fog.h"
00027 
00028 namespace Lamp{
00029 
00030 // リミット値
00031 const float Fog::limitValue = 10000.f;// 微妙
00032 
00033 // 指数ドロップオフリミット係数
00034 const float Fog::exponentLimit = Math::log(64.f);// 256/4
00035 
00036 // 二乗の指数ドロップオフリミット係数
00037 const float Fog::exponent2Limit = Math::sqrt(Math::log(64.f));// 256/4
00038 
00039 //------------------------------------------------------------------------------
00040 // コンストラクタ
00041 Fog::Fog() : color_(128, 128, 128, 0), mode_(modeLinear),
00042     density_(0.5f), fogNear_(1.f), fogFar_(limitValue), enabled_(false){
00043 }
00044 //------------------------------------------------------------------------------
00045 // デストラクタ
00046 Fog::~Fog(){
00047 }
00048 //------------------------------------------------------------------------------
00049 // 限界値の取得
00050 float Fog::getLimit(){
00051     if(enabled_){
00052         if(mode_ == modeLinear){
00053             return fogFar_;
00054         }else if(mode_ == modeExponent){
00055             return (exponentLimit / density_);
00056         }else if(mode_ == modeExponent2){
00057             return (exponent2Limit / density_);
00058         }
00059     }
00060     return limitValue;
00061 }
00062 //------------------------------------------------------------------------------
00063 } // End of namespace Lamp
00064 //------------------------------------------------------------------------------

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