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# Timer.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  * タイマ実装
    00022  * @author Junpee
    00023  */
    00024
    00025 #include <windows.h>
    00026 #include "LampBasic.h"
    00027 #include "Core/Utility/Timer.h"
    00028 #include "Core/Debug/ErrorOutput.h"
    00029
    00030 namespace Lamp{
    00031
    00032 // 1msあたりのクロック数
    00033 float Timer::tickPerMillisecond_ = 0.f;
    00034
    00035 // 初期化済みフラグ
    00036 bool Timer::initialized_ = false;
    00037
    00038 //------------------------------------------------------------------------------
    00039 // 初期化
    00040 void Timer::initialize(){
    00041     if(initialized_){ return; }
    00042     Tick frequencyValue;
    00043     BOOL success = QueryPerformanceFrequency((LARGE_INTEGER*)&frequencyValue);
    00044     if(success){
    00045         tickPerMillisecond_ = (float)(frequencyValue.tick / 1000.f);
    00046     }else{
    00047         ErrorOut("高精度タイマの初期化に失敗しました。");
    00048         return;
    00049     }
    00050     initialized_ = true;
    00051 }
    00052 //------------------------------------------------------------------------------
    00053 // 時間の取得
    00054 Timer::Tick Timer::getTick(){
    00055     Tick tick;
    00056     QueryPerformanceCounter((LARGE_INTEGER*)&tick);
    00057     return tick;
    00058 }
    00059 //------------------------------------------------------------------------------
    00060 // 時間間隔の取得
    00061 float Timer::getInterval(const Tick& previousTick){
    00062     Tick nowTick = getTick();
    00063     return (nowTick.tick - previousTick.tick) / tickPerMillisecond_;
    00064 }
    00065 //------------------------------------------------------------------------------
    00066 // 時間間隔の取得
    00067 float Timer::getInterval(const Tick& previousTick, const Tick& afterTick){
    00068     return (afterTick.tick - previousTick.tick) / tickPerMillisecond_;
    00069 }
    00070 //------------------------------------------------------------------------------
    00071 } // End of namespace Lamp
    00072 //------------------------------------------------------------------------------