120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This application is open source and may be redistributed and/or modified
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* freely and without restriction, both in commericial and non commericial applications,
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* as long as this copyright notice is maintained.
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*
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* This application is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include <osgDB/ReadFile>
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#include <osgUtil/Optimizer>
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#include <osgViewer/Viewer>
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#include <iostream>
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class MotionBlurOperation: public osg::Operation
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{
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public:
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MotionBlurOperation(double persistence):
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osg::Operation("MotionBlur",true),
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cleared_(false),
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persistence_(persistence)
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{
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}
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virtual void operator () (osg::Object* object)
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{
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osg::GraphicsContext* gc = dynamic_cast<osg::GraphicsContext*>(object);
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if (!gc) return;
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double t = gc->getState()->getFrameStamp()->getSimulationTime();
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if (!cleared_)
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{
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// clear the accumulation buffer
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glClearColor(0, 0, 0, 0);
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glClear(GL_ACCUM_BUFFER_BIT);
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cleared_ = true;
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t0_ = t;
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}
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double dt = fabs(t - t0_);
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t0_ = t;
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// compute the blur factor
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double s = powf(0.2, dt / persistence_);
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// scale, accumulate and return
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glAccum(GL_MULT, s);
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glAccum(GL_ACCUM, 1 - s);
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glAccum(GL_RETURN, 1.0f);
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}
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private:
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bool cleared_;
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double t0_;
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double persistence_;
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};
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int main( int argc, char **argv )
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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// set up the usage document, in case we need to print out how to use this program.
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arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
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arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is an OpenSceneGraph example that shows how to use the accumulation buffer to achieve a simple motion blur effect.");
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arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
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arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
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arguments.getApplicationUsage()->addCommandLineOption("-P or --persistence","Set the motion blur persistence time");
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// construct the viewer.
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osgViewer::Viewer viewer;
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// if user request help write it out to cout.
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if (arguments.read("-h") || arguments.read("--help"))
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{
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arguments.getApplicationUsage()->write(std::cout);
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return 1;
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}
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double persistence = 0.25;
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arguments.read("-P", persistence) || arguments.read("--persistence", persistence);
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// read the scene from the list of file specified commandline args.
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osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
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// if no model has been successfully loaded report failure.
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if (!loadedModel)
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{
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std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
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return 1;
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}
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// set the display settings we can to request, OsgCameraGroup will read this.
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osg::DisplaySettings::instance()->setMinimumNumAccumBits(8,8,8,8);
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// pass the loaded scene graph to the viewer.
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viewer.setSceneData(loadedModel.get());
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// create the windows and run the threads.
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viewer.realize();
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osgViewer::Viewer::Windows windows;
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viewer.getWindows(windows);
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for(osgViewer::Viewer::Windows::iterator itr = windows.begin();
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itr != windows.end();
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++itr)
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{
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(*itr)->add(new MotionBlurOperation(persistence));
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}
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return viewer.run();
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}
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