OpenWalnut  1.4.0
WGEShaderAnimationCallback.h
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 #ifndef WGESHADERANIMATIONCALLBACK_H
00026 #define WGESHADERANIMATIONCALLBACK_H
00027 
00028 #include "stdint.h"
00029 
00030 #include "boost/date_time/posix_time/posix_time.hpp"
00031 
00032 #include <osg/Uniform>
00033 
00034 /**
00035  * This is a uniform callback setting the uniform to the current time in milliseconds, hundredth of a second or tenth of a second.
00036  */
00037 class WGEShaderAnimationCallback: public osg::Uniform::Callback
00038 {
00039 public:
00040     /**
00041      * Default constructor. Creates a new instance and sets the precision
00042      *
00043      * \param ticksPerSecond the uniform will increase by 1 every hundredth second if =100, every 10th second if =10 and every second if =1.
00044      */
00045     explicit WGEShaderAnimationCallback( int ticksPerSecond = 100 );
00046 
00047     /**
00048      * Destructor.
00049      */
00050     virtual ~WGEShaderAnimationCallback();
00051 
00052     /**
00053      * Operator called on uniform update.
00054      *
00055      * \param uniform the uniform to update
00056      * \param nv the visitor.
00057      */
00058     virtual void operator() ( osg::Uniform* uniform, osg::NodeVisitor* nv );
00059 
00060 protected:
00061     /**
00062      * Timer that stops the time hopefully OS independent
00063      */
00064     boost::posix_time::ptime m_start;
00065 
00066     /**
00067      * Number of ticks to count per second.
00068      */
00069     int m_ticksPerSec;
00070 
00071     /**
00072      * Ratio between milliseconds and m_ticksPerSec
00073      */
00074     double m_tickMillisecRatio;
00075 
00076 private:
00077 };
00078 
00079 #endif  // WGESHADERANIMATIONCALLBACK_H
00080