OSG RTT 渲染到纹理

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1. #include <osg/Camera>  
2. #include <osg/Group>  
3. #include <osg/Geometry>  
4. #include <osgDB/ReadFile>  
5. #include <osgViewer/Viewer>  
6. #include <osg/Texture2D>  
7. #include <osgViewer/ViewerEventHandlers>  
8. #include <osg/GraphicsContext>  
9.   
10. #include <iostream>  
11.   
12.   
13. using namespace std;  
14.   
15.   
16. void CreateTexture(osgViewer::Viewer *viewer){  
17.   if(!viewer)  
18.     return;  
19.   
20.   osg::GraphicsContext::WindowingSystemInterface *wsi= osg::GraphicsContext::getWindowingSystemInterface();  
21.   if(!wsi){  
22.     cout<<"wsi is NULL"<<endl;  
23.     return;  
24.   }  
25.   unsigned int width,height;  
26.   wsi->getScreenResolution(osg::GraphicsContext::ScreenIdentifier(0), width, height);  
27.   
28.   osg::ref_ptr<osg::GraphicsContext::Traits>traits=new osg::GraphicsContext::Traits;  
29.   traits->x=0;  
30.   traits->y=0;  
31.   traits->width=width;  
32.   traits->height=height;  
33.   traits->windowDecoration=false;  
34.   traits->doubleBuffer=true;  
35.   traits->sharedContext=0;  
36.   
37.   osg::ref_ptr<osg::GraphicsContext>gc=osg::GraphicsContext::createGraphicsContext(traits);  
38.   if(!gc.valid()){  
39.     cout<<"gc is NULL" <<endl;  
40.     return;  
41.   }  
42.   osg::ref_ptr<osg::Camera>master=new osg::Camera;  
43.   master->setGraphicsContext(gc);  
44.   master->setViewport(0, 0, width, height);  
45.   viewer->addSlave(master.get());  
46.   cout<<height<<"  ,  "<<width<<endl;  
47.   
48.   osg::ref_ptr<osg::Camera>rttCamera=new osg::Camera;  
49.   rttCamera->setRenderOrder(osg::Camera::PRE_RENDER);//最先渲染  
50.   rttCamera->setGraphicsContext(gc);  
51.   rttCamera->setViewport(0, 0, width, height);  
52.   rttCamera->addChild(osgDB::readNodeFile("ceep.ive"));  
53.   viewer->addSlave(rttCamera,false);  
54.   
55.   
56.   
57.   
58.   osg::ref_ptr<osg::Group>root=new osg::Group;  
59.   osg::ref_ptr<osg::Geode>geode=new osg::Geode;  
60.   root->addChild(geode);  
61.   
62.   osg::ref_ptr<osg::Geometry>gm=new osg::Geometry;  
63.   geode->addDrawable(gm);  
64.   
65.   osg::ref_ptr<osg::Vec3Array>vertex=new osg::Vec3Array;  
66.   vertex->push_back(osg::Vec3(-400,200,-300));  
67.   vertex->push_back(osg::Vec3(400,200,-300));  
68.   vertex->push_back(osg::Vec3(400,200,300));  
69.   vertex->push_back(osg::Vec3(-400,200,300));  
70.   gm->setVertexArray(vertex);  
71.   
72.   osg::ref_ptr<osg::Vec3Array>norm=new osg::Vec3Array;  
73.   norm->push_back(osg::Vec3(0,-1,0));  
74.   gm->setNormalArray(norm);  
75.   gm->setNormalBinding(osg::Geometry::BIND_OVERALL);  
76.   
77.   osg::ref_ptr<osg::Vec2Array>coord=new osg::Vec2Array;  
78.   coord->push_back(osg::Vec2(0,0));  
79.   coord->push_back(osg::Vec2(1,0));  
80.   coord->push_back(osg::Vec2(1,1));  
81.   coord->push_back(osg::Vec2(0,1));  
82.   gm->setTexCoordArray(0, coord);  
83.   gm->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4));  
84.   gm->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF);  
85.   
86.   osg::ref_ptr<osg::Texture2D>t2d=new osg::Texture2D;  
87. /*  osg::ref_ptr<osg::Image>image=osgDB::readImageFile("Images/blueFlowers.png"); 
88.   if(!image){ 
89.     cout<<"image is NULL"<<endl; 
90.     return; 
91.   } 
92.   t2d->setImage(0,image); 
93. */  
94.   
95.   t2d->setInternalFormat(GL_RGBA);  
96. //  viewer->getCamera()->attach(osg::Camera::COLOR_BUFFER, t2d);  
97.   
98.   rttCamera->attach(osg::Camera::COLOR_BUFFER,t2d);  
99.   
100.   gm->getOrCreateStateSet()->setTextureAttributeAndModes(0, t2d,osg::StateAttribute::ON);  
101.   
102.   root->addChild(osgDB::readNodeFile("ceep.ive"));  
103.   
104.   viewer->setSceneData(root);  
105.   return;  
106.   
107. }  
108. int main(int argc, char *argv[])  
109. {  
110.   osg::ref_ptr<osgViewer::Viewer>viewer=new osgViewer::Viewer;  
111.   CreateTexture(viewer);  
112.   
113.   viewer->addEventHandler(new osgViewer::WindowSizeHandler);  
114.   viewer->addEventHandler(new osgViewer::ScreenCaptureHandler);  
115.   return viewer->run();  
116.   return 0;  
117. }  

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