root/OpenSceneGraph/trunk/examples/osgcamera/osgcamera.cpp @ 5874

Revision 5874, 6.5 kB (checked in by robert, 8 years ago)

Improved the robustness of thread start and cancellation

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
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1// C++ source file - (C) 2003 Robert Osfield, released under the OSGPL.
2//
3// Simple example of use of Producer::RenderSurface to create an OpenGL
4// graphics window, and OSG for rendering.
5
6
7#include <osgDB/ReadFile>
8#include <osgViewer/Viewer>
9#include <osgGA/TrackballManipulator>
10#include <osgGA/AnimationPathManipulator>
11#include <iostream>
12
13void singleWindowMultipleCameras(osgViewer::Viewer& viewer)
14{
15    osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();
16    if (!wsi)
17    {
18        osg::notify(osg::NOTICE)<<"View::setUpViewAcrossAllScreens() : Error, no WindowSystemInterface available, cannot create windows."<<std::endl;
19        return;
20    }
21   
22    unsigned int width, height;
23    wsi->getScreenResolution(osg::GraphicsContext::ScreenIdentifier(0), width, height);
24
25    osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
26    traits->x = 0;
27    traits->y = 0;
28    traits->width = width;
29    traits->height = height;
30#if 0
31    traits->windowDecoration = false;
32#else
33    traits->windowDecoration = true;
34#endif           
35    traits->doubleBuffer = true;
36    traits->sharedContext = 0;
37
38    osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
39
40    osgViewer::GraphicsWindow* gw = dynamic_cast<osgViewer::GraphicsWindow*>(gc.get());
41    if (gw)
42    {
43        osg::notify(osg::NOTICE)<<"  GraphicsWindow has been created successfully."<<gw<<std::endl;
44
45        gw->getEventQueue()->getCurrentEventState()->setWindowRectangle(0, 0, width, height );
46    }
47    else
48    {
49        osg::notify(osg::NOTICE)<<"  GraphicsWindow has not been created successfully."<<std::endl;
50    }
51
52    unsigned int numCameras = 2;
53    double aspectRatioScale = 1.0;///(double)numCameras;
54    for(unsigned int i=0; i<numCameras;++i)
55    {
56        osg::ref_ptr<osg::Camera> camera = new osg::Camera;
57        camera->setGraphicsContext(gc.get());
58        camera->setViewport(new osg::Viewport((i*width)/numCameras,(i*height)/numCameras, width/numCameras, height/numCameras));
59        GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
60        camera->setDrawBuffer(buffer);
61        camera->setReadBuffer(buffer);
62
63        viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd::scale(aspectRatioScale,1.0,1.0));
64    }
65
66    viewer.setUpRenderingSupport();
67    viewer.assignSceneDataToCameras();
68}
69
70void multipleWindowMultipleCameras(osgViewer::Viewer& viewer)
71{
72    osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();
73    if (!wsi)
74    {
75        osg::notify(osg::NOTICE)<<"View::setUpViewAcrossAllScreens() : Error, no WindowSystemInterface available, cannot create windows."<<std::endl;
76        return;
77    }
78   
79    unsigned int width, height;
80    wsi->getScreenResolution(osg::GraphicsContext::ScreenIdentifier(0), width, height);
81
82
83    unsigned int numCameras = 2;
84    double aspectRatioScale = (double)numCameras;
85    double translate_x = double(numCameras)-1;
86    for(unsigned int i=0; i<numCameras;++i, translate_x -= 2.0)
87    {
88        osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
89        traits->x = (i*width)/numCameras;
90        traits->y = 0;
91        traits->width = width/numCameras-1;
92        traits->height = height;
93    #if 1
94        traits->windowDecoration = false;
95    #else
96        traits->windowDecoration = true;
97    #endif           
98        traits->doubleBuffer = true;
99        traits->sharedContext = 0;
100
101        osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
102
103        osgViewer::GraphicsWindow* gw = dynamic_cast<osgViewer::GraphicsWindow*>(gc.get());
104        if (gw)
105        {
106            osg::notify(osg::NOTICE)<<"  GraphicsWindow has been created successfully."<<gw<<std::endl;
107
108            gw->getEventQueue()->getCurrentEventState()->setWindowRectangle(0, 0, traits->width, traits->height );
109        }
110        else
111        {
112            osg::notify(osg::NOTICE)<<"  GraphicsWindow has not been created successfully."<<std::endl;
113        }
114
115        osg::ref_ptr<osg::Camera> camera = new osg::Camera;
116        camera->setGraphicsContext(gc.get());
117        camera->setViewport(new osg::Viewport(0,0, width/numCameras, height));
118        GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
119        camera->setDrawBuffer(buffer);
120        camera->setReadBuffer(buffer);
121
122        viewer.addSlave(camera.get(), osg::Matrix::scale(aspectRatioScale, 1.0, 1.0)*osg::Matrix::translate(translate_x, 0.0, 0.0), osg::Matrix() );
123    }
124
125    viewer.setUpRenderingSupport();
126    viewer.assignSceneDataToCameras();
127}
128
129int main( int argc, char **argv )
130{
131    // use an ArgumentParser object to manage the program arguments.
132    osg::ArgumentParser arguments(&argc,argv);
133
134    if (argc<2)
135    {
136        std::cout << argv[0] <<": requires filename argument." << std::endl;
137        return 1;
138    }
139
140
141    std::string pathfile;
142    osg::ref_ptr<osgGA::AnimationPathManipulator> apm = 0;
143    while (arguments.read("-p",pathfile))
144    {
145        apm = new osgGA::AnimationPathManipulator(pathfile);
146        if(!apm.valid() || !(apm->valid()) )
147        {
148            apm = 0;
149        }
150    }
151
152    osg::DisplaySettings::instance()->setMaxNumberOfGraphicsContexts(2);
153    osg::Referenced::setThreadSafeReferenceCounting(true);
154
155    // load the scene.
156    osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
157    if (!loadedModel)
158    {
159        std::cout << argv[0] <<": No data loaded." << std::endl;
160        return 1;
161    }
162
163    osgViewer::Viewer viewer;
164   
165    while (arguments.read("-s")) { viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded); }
166    while (arguments.read("-g")) { viewer.setThreadingModel(osgViewer::Viewer::ThreadPerContext); }
167    while (arguments.read("-c")) { viewer.setThreadingModel(osgViewer::Viewer::ThreadPerCamera); }
168
169    viewer.setSceneData(loadedModel.get());
170
171    if (apm.valid()) viewer.setCameraManipulator(apm.get());
172    else viewer.setCameraManipulator( new osgGA::TrackballManipulator() );
173    viewer.getCamera()->setClearColor(osg::Vec4f(0.6f,0.6f,0.8f,1.0f));
174
175#if 0
176
177    // singleWindowMultipleCameras(viewer);
178   
179    multipleWindowMultipleCameras(viewer);
180   
181   
182#else
183
184    viewer.setUpViewAcrossAllScreens();
185
186#endif   
187   
188    viewer.realize();
189
190    bool limitNumberOfFrames = true;
191    unsigned int numFrames = 0;
192    unsigned int maxFrames = 10;
193
194    while(!viewer.done() && !(limitNumberOfFrames && numFrames>=maxFrames))
195    {
196        viewer.frame();
197        ++numFrames;
198    }
199
200    return 0;
201}
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