OpenWalnut
1.4.0
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00001 //--------------------------------------------------------------------------- 00002 // 00003 // Project: OpenWalnut ( http://www.openwalnut.org ) 00004 // 00005 // Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS 00006 // For more information see http://www.openwalnut.org/copying 00007 // 00008 // This file is part of OpenWalnut. 00009 // 00010 // OpenWalnut is free software: you can redistribute it and/or modify 00011 // it under the terms of the GNU Lesser General Public License as published by 00012 // the Free Software Foundation, either version 3 of the License, or 00013 // (at your option) any later version. 00014 // 00015 // OpenWalnut is distributed in the hope that it will be useful, 00016 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00018 // GNU Lesser General Public License for more details. 00019 // 00020 // You should have received a copy of the GNU Lesser General Public License 00021 // along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>. 00022 // 00023 //--------------------------------------------------------------------------- 00024 00025 #include <ctime> 00026 #include <iostream> 00027 00028 #include "boost/date_time/posix_time/posix_time.hpp" 00029 00030 #include "WGEShaderAnimationCallback.h" 00031 00032 WGEShaderAnimationCallback::WGEShaderAnimationCallback( int ticksPerSecond ): 00033 osg::Uniform::Callback(), 00034 m_start( boost::posix_time::microsec_clock::local_time() ), 00035 m_ticksPerSec( ticksPerSecond ), 00036 m_tickMillisecRatio( static_cast< double >( ticksPerSecond ) / 1000.0 ) 00037 { 00038 } 00039 00040 WGEShaderAnimationCallback::~WGEShaderAnimationCallback() 00041 { 00042 // cleanup 00043 } 00044 00045 void WGEShaderAnimationCallback::operator() ( osg::Uniform* uniform, osg::NodeVisitor* /*nv*/ ) 00046 { 00047 // according to boost doc, this is available on windows too! From boost doc "Get the local time using a sub second resolution clock. On Unix 00048 // systems this is implemented using GetTimeOfDay. On most Win32 platforms it is implemented using ftime. Win32 systems often do not achieve 00049 // microsecond resolution via this API. If higher resolution is critical to your application test your platform to see the achieved resolution. 00050 // -> fortunately, millisecond resolution is enough here. 00051 boost::posix_time::ptime t = boost::posix_time::microsec_clock::local_time(); 00052 00053 boost::posix_time::time_duration td = t - m_start; 00054 int ticks = static_cast< int >( static_cast< double >( td.total_milliseconds() ) * m_tickMillisecRatio ); 00055 00056 uniform->set( ticks ); 00057 } 00058