281 lines
8.4 KiB
C++
281 lines
8.4 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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 <osgViewer/Viewer>
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#include <osgViewer/CompositeViewer>
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#include <osgGA/TrackballManipulator>
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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/PolygonOffset>
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#include <osg/MatrixTransform>
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#include <osg/Camera>
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#include <osgText/Text>
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osg::Camera* createHUD()
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{
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// create a camera to set up the projection and model view matrices, and the subgraph to drawn in the HUD
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osg::Camera* camera = new osg::Camera;
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// set the projection matrix
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camera->setProjectionMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
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// set the view matrix
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camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
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camera->setViewMatrix(osg::Matrix::identity());
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// only clear the depth buffer
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camera->setClearMask(GL_DEPTH_BUFFER_BIT);
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// draw subgraph after main camera view.
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camera->setRenderOrder(osg::Camera::POST_RENDER);
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// we don't want the camera to grab event focus from the viewers main camera(s).
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camera->setAllowEventFocus(false);
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// add to this camera a subgraph to render
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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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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("Then place an osg::Camera above the subgraph\n"
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"to create an orthographic projection.\n");
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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("Set the Camera's ReferenceFrame to ABSOLUTE_RF to ensure\n"
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"it 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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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 set the Camera's clear mask to just clear the depth buffer.");
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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 finally set the Camera's RenderOrder to POST_RENDER\n"
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"to make sure its drawn last.");
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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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camera->addChild(geode);
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}
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return camera;
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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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// 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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if (!scene)
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{
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osg::notify(osg::NOTICE)<<"No model loaded"<<std::endl;
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return 1;
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}
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if (arguments.read("--Viewer"))
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{
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// construct the viewer.
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osgViewer::Viewer viewer;
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// create a HUD as slave camera attached to the master view.
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viewer.setUpViewAcrossAllScreens();
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osgViewer::Viewer::Windows windows;
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viewer.getWindows(windows);
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if (windows.empty()) return 1;
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osg::Camera* hudCamera = createHUD();
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// set up cameras to rendering on the first window available.
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hudCamera->setGraphicsContext(windows[0]);
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hudCamera->setViewport(0,0,windows[0]->getTraits()->width, windows[0]->getTraits()->height);
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viewer.addSlave(hudCamera, false);
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// set the scene to render
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viewer.setSceneData(scene.get());
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return viewer.run();
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}
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if (arguments.read("--CompositeViewer"))
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{
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// construct the viewer.
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osgViewer::CompositeViewer viewer;
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// create the main 3D view
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osgViewer::View* view = new osgViewer::View;
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viewer.addView(view);
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view->setSceneData(scene.get());
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view->setUpViewAcrossAllScreens();;
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view->setCameraManipulator(new osgGA::TrackballManipulator);
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// now create the HUD camera's view
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osgViewer::Viewer::Windows windows;
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viewer.getWindows(windows);
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if (windows.empty()) return 1;
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osg::Camera* hudCamera = createHUD();
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// set up cameras to rendering on the first window available.
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hudCamera->setGraphicsContext(windows[0]);
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hudCamera->setViewport(0,0,windows[0]->getTraits()->width, windows[0]->getTraits()->height);
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osgViewer::View* hudView = new osgViewer::View;
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hudView->setCamera(hudCamera);
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viewer.addView(hudView);
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return viewer.run();
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}
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else
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{
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// construct the viewer.
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osgViewer::Viewer viewer;
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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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return viewer.run();
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}
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}
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