Hi Panagiotis
I attach a osgviewer based example of use of multisample
You can switch on/off multisample with the key 'm'
Cheers
David
2007/10/14, Panagiotis Papadakos <[EMAIL PROTECTED]>:
>
> Hi David
>
> On Tue, 9 Oct 2007, David Callu wrote:
>
> > Hi Panagiotis
> >
> > 2007/10/6, Panagiotis Papadakos <[EMAIL PROTECTED]>:
> >>
> >> Hi.
> >>
> >> I want to add an option of using multisampling for my app. So I have
> setup
> >> DisplaySettings with setNumMultiSamples(4). The user is able to
> >> enable/disable multisampling as he feels in the app, by
> enabling/disabling
> >>
> >> the GL_MULTISAMPLE_ARB in the root stateset. My problem now is that
> >> initially I want to have multisampling disabled, which I can't figure
> out
> >> how to do. I have tried setting GL_MULTISAMPLE_ARB OFF in the root
> >> stateset, but this doesn't seem to help. Any ideas?
> >
> >
>
> > This seem to be the good method.
> > you can try
> >
> > 1) do root->getOrCreateStateSet()->setMode(GLL_MULTISAMPLE_ARB,
> > osg::StateAttribut::OFF | osg::StateAttribut::OVERRIDE)
>
> This is what I've been trying. More specifically
> root->getOrCreateStateSet()->setMode(GL_MULTISAMPLE_ARB,
> osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED |
> osg::StateAttribute::OVERRIDE);
>
> after the viewer has been realized.
>
> > 2) I think that number of sample is define when the OpenGL context is
> > created
> > so recreate a context on each switch of the number os sample you
> want.
> >
> Why should I recreate a context? I think I should be able to
> enable/disable Multisampling with setting the state mode ON/OFF.
>
> > How did you know that multisample is enabling/disabling.
> > Did you look the render ?
> Yep, that is the case. I saw the render.
>
> > Did you do a request to OpenGL about multisample ?
> >
> >
> > David
> >
> >
> > Thanks
> >> Panagiotis Papadakos
> >> _______________________________________________
> >> osg-users mailing list
> >> [email protected]
> >>
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> >>
> >
>
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This application is open source and may be redistributed and/or modified
* freely and without restriction, both in commericial and non commericial applications,
* as long as this copyright notice is maintained.
*
* This application is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <osgDB/ReadFile>
#include <osgUtil/Optimizer>
#include <osg/CoordinateSystemNode>
#include <osg/Multisample>
#include <osg/Switch>
#include <osgText/Text>
#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>
#include <osgGA/TrackballManipulator>
#include <osgGA/FlightManipulator>
#include <osgGA/DriveManipulator>
#include <osgGA/KeySwitchMatrixManipulator>
#include <osgGA/StateSetManipulator>
#include <osgGA/AnimationPathManipulator>
#include <osgGA/TerrainManipulator>
#include <iostream>
class SwitchMultisampleHandler : public osgGA::GUIEventHandler
{
public:
SwitchMultisampleHandler(osg::StateSet * ss) :
_useMultisample(false), _ss(ss)
{
_ss->setAttributeAndModes(new osg::Multisample, osg::StateAttribute::ON);
_ss->setMode(GL_MULTISAMPLE, osg::StateAttribute::OFF | osg::StateAttribute::OVERRIDE);
}
bool handle(const osgGA::GUIEventAdapter &ea, osgGA::GUIActionAdapter &)
{
if (ea.getHandled())
return false;
switch (ea.getEventType())
{
case (osgGA::GUIEventAdapter::KEYUP):
{
if (ea.getKey() == 'm')
{
if (_useMultisample == false)
{
_ss->setMode(GL_MULTISAMPLE, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
_useMultisample = true;
}
else
{
_ss->setMode(GL_MULTISAMPLE, osg::StateAttribute::OFF | osg::StateAttribute::OVERRIDE);
_useMultisample = false;
}
return true;
}
break;
}
default:
break;
}
return false;
}
private:
bool _useMultisample;
osg::ref_ptr<osg::StateSet> _ss;
};
int main(int argc, char** argv)
{
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(&argc,argv);
arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the standard OpenSceneGraph example which loads and visualises 3d models.");
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
arguments.getApplicationUsage()->addCommandLineOption("--image <filename>","Load an image and render it on a quad");
arguments.getApplicationUsage()->addCommandLineOption("--dem <filename>","Load an image/DEM and render it on a HeightField");
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display command line parameters");
arguments.getApplicationUsage()->addCommandLineOption("--help-env","Display environmental variables available");
arguments.getApplicationUsage()->addCommandLineOption("--help-keys","Display keyboard & mouse bindings available");
arguments.getApplicationUsage()->addCommandLineOption("--help-all","Display all command line, env vars and keyboard & mouse bindings.");
arguments.getApplicationUsage()->addCommandLineOption("--SingleThreaded","Select SingleThreaded threading model for viewer.");
arguments.getApplicationUsage()->addCommandLineOption("--CullDrawThreadPerContext","Select CullDrawThreadPerContext threading model for viewer.");
arguments.getApplicationUsage()->addCommandLineOption("--DrawThreadPerContext","Select DrawThreadPerContext threading model for viewer.");
arguments.getApplicationUsage()->addCommandLineOption("--CullThreadPerCameraDrawThreadPerContext","Select CullThreadPerCameraDrawThreadPerContext threading model for viewer.");
// if user request help write it out to cout.
bool helpAll = arguments.read("--help-all");
unsigned int helpType = ((helpAll || arguments.read("-h") || arguments.read("--help"))? osg::ApplicationUsage::COMMAND_LINE_OPTION : 0 ) |
((helpAll || arguments.read("--help-env"))? osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE : 0 ) |
((helpAll || arguments.read("--help-keys"))? osg::ApplicationUsage::KEYBOARD_MOUSE_BINDING : 0 );
if (helpType)
{
arguments.getApplicationUsage()->write(std::cout, helpType);
return 1;
}
osgViewer::Viewer viewer(arguments);
// report any errors if they have occurred when parsing the program arguments.
if (arguments.errors())
{
arguments.writeErrorMessages(std::cout);
return 1;
}
if (arguments.argc()<=1)
{
arguments.getApplicationUsage()->write(std::cout,osg::ApplicationUsage::COMMAND_LINE_OPTION);
return 1;
}
// set up the camera manipulators.
{
osg::ref_ptr<osgGA::KeySwitchMatrixManipulator> keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;
keyswitchManipulator->addMatrixManipulator( '1', "Trackball", new osgGA::TrackballManipulator() );
keyswitchManipulator->addMatrixManipulator( '2', "Flight", new osgGA::FlightManipulator() );
keyswitchManipulator->addMatrixManipulator( '3', "Drive", new osgGA::DriveManipulator() );
keyswitchManipulator->addMatrixManipulator( '4', "Terrain", new osgGA::TerrainManipulator() );
std::string pathfile;
char keyForAnimationPath = '5';
while (arguments.read("-p",pathfile))
{
osgGA::AnimationPathManipulator* apm = new osgGA::AnimationPathManipulator(pathfile);
if (apm || !apm->valid())
{
unsigned int num = keyswitchManipulator->getNumMatrixManipulators();
keyswitchManipulator->addMatrixManipulator( keyForAnimationPath, "Path", apm );
keyswitchManipulator->selectMatrixManipulator(num);
++keyForAnimationPath;
}
}
viewer.setCameraManipulator( keyswitchManipulator.get() );
}
// add the state manipulator
viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );
// add the state manipulator
viewer.addEventHandler( new SwitchMultisampleHandler(viewer.getCamera()->getOrCreateStateSet()) );
// add the thread model handler
viewer.addEventHandler(new osgViewer::ThreadingHandler);
// add the window size toggle handler
viewer.addEventHandler(new osgViewer::WindowSizeHandler);
// add the stats handler
viewer.addEventHandler(new osgViewer::StatsHandler);
// add the help handler
viewer.addEventHandler(new osgViewer::HelpHandler(arguments.getApplicationUsage()));
// add the record camera path handler
viewer.addEventHandler(new osgViewer::RecordCameraPathHandler);
// load the data
osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
if (!loadedModel)
{
std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
return 1;
}
// any option left unread are converted into errors to write out later.
arguments.reportRemainingOptionsAsUnrecognized();
// report any errors if they have occurred when parsing the program arguments.
if (arguments.errors())
{
arguments.writeErrorMessages(std::cout);
return 1;
}
// optimize the scene graph, remove redundant nodes and state etc.
osgUtil::Optimizer optimizer;
optimizer.optimize(loadedModel.get());
viewer.setSceneData( loadedModel.get() );
viewer.realize();
viewer.run();
}
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