235 lines
7.5 KiB
C++
235 lines
7.5 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library 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. See the
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* OpenSceneGraph Public License for more details.
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*/
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#include <osgUtil/Optimizer>
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#include <osgDB/ReadFile>
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#include <osgProducer/Viewer>
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#include <osg/Material>
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#include <osg/Geode>
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#include <osg/BlendFunc>
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#include <osg/Depth>
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#include <osg/Projection>
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#include <osg/PolygonOffset>
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#include <osg/MatrixTransform>
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#include <osgText/Text>
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osg::Node* createHUD()
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{
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osg::Geode* geode = new osg::Geode();
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std::string timesFont("fonts/arial.ttf");
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// turn lighting off for the text and disable depth test to ensure its always ontop.
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osg::StateSet* stateset = geode->getOrCreateStateSet();
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stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
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#if 0
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// to ensure the hud appears on top we can either use osg::Depth to force the
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// depth fragments to be placed at the front of the screen.
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stateset->setAttribute(new osg::Depth(osg::Depth::LESS,0.0,0.0001));
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#else
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// or disable depth test, and make sure that the hud is drawn after everything
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// else so that it always appears ontop.
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stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
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stateset->setRenderBinDetails(11,"RenderBin");
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#endif
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osg::Vec3 position(150.0f,800.0f,0.0f);
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osg::Vec3 delta(0.0f,-120.0f,0.0f);
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{
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osgText::Text* text = new osgText::Text;
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geode->addDrawable( text );
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text->setFont(timesFont);
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text->setPosition(position);
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text->setText("Head Up Displays are simple :-)");
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position += delta;
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}
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{
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osgText::Text* text = new osgText::Text;
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geode->addDrawable( text );
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text->setFont(timesFont);
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text->setPosition(position);
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text->setText("All you need to do is create your text in a subgraph.");
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position += delta;
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}
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{
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osgText::Text* text = new osgText::Text;
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geode->addDrawable( text );
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text->setFont(timesFont);
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text->setPosition(position);
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text->setText("Disable depth test in this subgraph to ensure its always ontop.");
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position += delta;
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}
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{
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osgText::Text* text = new osgText::Text;
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geode->addDrawable( text );
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text->setFont(timesFont);
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text->setPosition(position);
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text->setText("Then place an osg::Projection node above the subgraph\nto create an orthographic projection.");
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position += delta;
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}
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{
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osgText::Text* text = new osgText::Text;
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geode->addDrawable( text );
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text->setFont(timesFont);
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text->setPosition(position);
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text->setText("And add an osg::ModelViewMatrix set to ABSOLUTE_RF to ensure\nit remains independent from any external model view matrices.");
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position += delta;
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}
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{
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osg::BoundingBox bb;
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for(unsigned int i=0;i<geode->getNumDrawables();++i)
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{
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bb.expandBy(geode->getDrawable(i)->getBound());
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}
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osg::Geometry* geom = new osg::Geometry;
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osg::Vec3Array* vertices = new osg::Vec3Array;
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float depth = bb.zMin()-0.1;
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vertices->push_back(osg::Vec3(bb.xMin(),bb.yMax(),depth));
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vertices->push_back(osg::Vec3(bb.xMin(),bb.yMin(),depth));
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vertices->push_back(osg::Vec3(bb.xMax(),bb.yMin(),depth));
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vertices->push_back(osg::Vec3(bb.xMax(),bb.yMax(),depth));
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geom->setVertexArray(vertices);
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osg::Vec3Array* normals = new osg::Vec3Array;
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normals->push_back(osg::Vec3(0.0f,0.0f,1.0f));
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geom->setNormalArray(normals);
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geom->setNormalBinding(osg::Geometry::BIND_OVERALL);
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osg::Vec4Array* colors = new osg::Vec4Array;
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colors->push_back(osg::Vec4(1.0f,1.0,0.8f,0.2f));
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geom->setColorArray(colors);
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geom->setColorBinding(osg::Geometry::BIND_OVERALL);
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geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS,0,4));
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osg::StateSet* stateset = geom->getOrCreateStateSet();
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stateset->setMode(GL_BLEND,osg::StateAttribute::ON);
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//stateset->setAttribute(new osg::PolygonOffset(1.0f,1.0f),osg::StateAttribute::ON);
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stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
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geode->addDrawable(geom);
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}
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// create the hud.
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osg::MatrixTransform* modelview_abs = new osg::MatrixTransform;
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modelview_abs->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
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modelview_abs->setMatrix(osg::Matrix::identity());
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modelview_abs->addChild(geode);
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osg::Projection* projection = new osg::Projection;
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projection->setMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
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projection->addChild(modelview_abs);
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return projection;
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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()->setDescription(arguments.getApplicationName()+" is the example which demonstrates how to do Head Up Displays.");
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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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// construct the viewer.
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osgProducer::Viewer viewer(arguments);
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// set up the value with sensible default event handlers.
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viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
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// get details on keyboard and mouse bindings used by the viewer.
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viewer.getUsage(*arguments.getApplicationUsage());
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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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// any option left unread are converted into errors to write out later.
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arguments.reportRemainingOptionsAsUnrecognized();
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// report any errors if they have occured when parsing the program aguments.
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if (arguments.errors())
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{
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arguments.writeErrorMessages(std::cout);
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return 1;
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}
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// read the scene from the list of file specified commandline args.
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osg::ref_ptr<osg::Node> scene = osgDB::readNodeFiles(arguments);
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osg::ref_ptr<osg::Group> group = new osg::Group;
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// add the HUD subgraph.
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if (scene.valid()) group->addChild(scene.get());
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group->addChild(createHUD());
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// set the scene to render
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viewer.setSceneData(group.get());
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// create the windows and run the threads.
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viewer.realize();
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while( !viewer.done() )
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{
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// wait for all cull and draw threads to complete.
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viewer.sync();
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// update the scene by traversing it with the the update visitor which will
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// call all node update callbacks and animations.
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viewer.update();
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// fire off the cull and draw traversals of the scene.
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viewer.frame();
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}
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// wait for all cull and draw threads to complete before exit.
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viewer.sync();
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return 0;
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}
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