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nux  3.0.0
GLTimer.cpp
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00001 /*
00002  * Copyright 2010 Inalogic® Inc.
00003  *
00004  * This program is free software: you can redistribute it and/or modify it
00005  * under the terms of the GNU Lesser General Public License, as
00006  * published by the  Free Software Foundation; either version 2.1 or 3.0
00007  * of the License.
00008  *
00009  * This program is distributed in the hope that it will be useful, but
00010  * WITHOUT ANY WARRANTY; without even the implied warranties of
00011  * MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
00012  * PURPOSE.  See the applicable version of the GNU Lesser General Public
00013  * License for more details.
00014  *
00015  * You should have received a copy of both the GNU Lesser General Public
00016  * License along with this program. If not, see <http://www.gnu.org/licenses/>
00017  *
00018  * Authored by: Jay Taoko <jaytaoko@inalogic.com>
00019  *
00020  */
00021 
00022 
00023 #include "NuxCore/NuxCore.h"
00024 #include "GLResource.h"
00025 #include "GLTimer.h"
00026 
00027 namespace nux
00028 {
00029   GLTimer::GLTimer()
00030   {
00031 #if defined(NUX_OS_WINDOWS)
00032     LARGE_INTEGER freq;
00033     QueryPerformanceFrequency(&freq);
00034     QueryPerformanceCounter(&now);
00035     res = (float) (1.0f / (double) freq.QuadPart);
00036 #elif defined(NUX_OS_LINUX)
00037     gettimeofday(&m_last_time, NULL);
00038 #endif
00039   }
00040 
00041   GLTimer::~GLTimer()
00042   {
00043   }
00044 
00045   void GLTimer::Reset(void)
00046   {
00047 #if defined(NUX_OS_WINDOWS)
00048     QueryPerformanceCounter(&now);
00049 #elif defined(NUX_OS_LINUX)
00050     gettimeofday(&m_last_time, NULL);
00051 #endif
00052   }
00053 
00054   float GLTimer::PassedMilliseconds(void)
00055   {
00056 #if defined(NUX_OS_WINDOWS)
00057     LARGE_INTEGER temp;
00058     QueryPerformanceCounter(&temp);
00059     double elapsedTime = (temp.QuadPart - now.QuadPart) * res * 1000.0f;
00060     //now.QuadPart = temp.QuadPart;
00061     return elapsedTime;
00062 
00063 #elif defined(NUX_OS_LINUX)
00064     timeval current_time;
00065     float elapsedTime;
00066 
00067     gettimeofday(&current_time, NULL);
00068 
00069     elapsedTime = (current_time.tv_sec - m_last_time.tv_sec) * 1000.0f;      // seconds to millisecond
00070     elapsedTime += (current_time.tv_usec - m_last_time.tv_usec) / 1000.0f;   // micro seconds to millisecond
00071     return elapsedTime;
00072 #endif
00073   }
00074 
00075 // float GLTimer::PassedFrac(void)
00076 // {
00077 //     LARGE_INTEGER temp;
00078 //     QueryPerformanceCounter(&temp);
00079 //     return(temp.QuadPart - now.QuadPart) * res;
00080 // }
00081 }