131 lines
4.4 KiB
C++
131 lines
4.4 KiB
C++
/* OpenSceneGraph example, osgmotionblur.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
|
|
#include <osgDB/ReadFile>
|
|
#include <osgUtil/Optimizer>
|
|
#include <osgViewer/Viewer>
|
|
#include <iostream>
|
|
|
|
class MotionBlurOperation: public osg::Operation
|
|
{
|
|
public:
|
|
MotionBlurOperation(double persistence):
|
|
osg::Operation("MotionBlur",true),
|
|
cleared_(false),
|
|
persistence_(persistence)
|
|
{
|
|
}
|
|
|
|
virtual void operator () (osg::Object* object)
|
|
{
|
|
osg::GraphicsContext* gc = dynamic_cast<osg::GraphicsContext*>(object);
|
|
if (!gc) return;
|
|
|
|
double t = gc->getState()->getFrameStamp()->getSimulationTime();
|
|
|
|
if (!cleared_)
|
|
{
|
|
// clear the accumulation buffer
|
|
glClearColor(0, 0, 0, 0);
|
|
glClear(GL_ACCUM_BUFFER_BIT);
|
|
cleared_ = true;
|
|
t0_ = t;
|
|
}
|
|
|
|
double dt = fabs(t - t0_);
|
|
t0_ = t;
|
|
|
|
// compute the blur factor
|
|
double s = powf(0.2, dt / persistence_);
|
|
|
|
// scale, accumulate and return
|
|
glAccum(GL_MULT, s);
|
|
glAccum(GL_ACCUM, 1 - s);
|
|
glAccum(GL_RETURN, 1.0f);
|
|
}
|
|
|
|
private:
|
|
bool cleared_;
|
|
double t0_;
|
|
double persistence_;
|
|
};
|
|
|
|
|
|
int main( int argc, char **argv )
|
|
{
|
|
|
|
// use an ArgumentParser object to manage the program arguments.
|
|
osg::ArgumentParser arguments(&argc,argv);
|
|
|
|
// set up the usage document, in case we need to print out how to use this program.
|
|
arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
|
|
arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is an OpenSceneGraph example that shows how to use the accumulation buffer to achieve a simple motion blur effect.");
|
|
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
|
|
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
|
|
arguments.getApplicationUsage()->addCommandLineOption("-P or --persistence","Set the motion blur persistence time");
|
|
|
|
|
|
// construct the viewer.
|
|
osgViewer::Viewer viewer;
|
|
|
|
// if user request help write it out to cout.
|
|
if (arguments.read("-h") || arguments.read("--help"))
|
|
{
|
|
arguments.getApplicationUsage()->write(std::cout);
|
|
return 1;
|
|
}
|
|
|
|
double persistence = 0.25;
|
|
arguments.read("-P", persistence) || arguments.read("--persistence", persistence);
|
|
|
|
// read the scene from the list of file specified commandline args.
|
|
osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
|
|
|
|
// if not loaded assume no arguments passed in, try use default mode instead.
|
|
if (!loadedModel) loadedModel = osgDB::readNodeFile("cow.osg");
|
|
|
|
// if no model has been successfully loaded report failure.
|
|
if (!loadedModel)
|
|
{
|
|
std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
|
|
return 1;
|
|
}
|
|
|
|
|
|
// set the display settings we can to request, OsgCameraGroup will read this.
|
|
osg::DisplaySettings::instance()->setMinimumNumAccumBits(8,8,8,8);
|
|
|
|
// pass the loaded scene graph to the viewer.
|
|
viewer.setSceneData(loadedModel.get());
|
|
|
|
// create the windows and run the threads.
|
|
viewer.realize();
|
|
|
|
osgViewer::Viewer::Windows windows;
|
|
viewer.getWindows(windows);
|
|
for(osgViewer::Viewer::Windows::iterator itr = windows.begin();
|
|
itr != windows.end();
|
|
++itr)
|
|
{
|
|
(*itr)->add(new MotionBlurOperation(persistence));
|
|
}
|
|
|
|
return viewer.run();
|
|
}
|