Added osgdistortion demo.

Make/makedirdefs

@@ -130,6 +130,7 @@ EXAMPLE_DIRS = \
 	osgbillboard\
 	osgbluemarble\
 	osgdem\
+	osgdistortion\
 	osgcallback\
 	osgcameragroup\
 	osgclip\

examples/osgdistortion/GNUmakefile

@@ -0,0 +1,17 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs 
+
+CXXFILES =\
+	osgdistortion.cpp\
+
+LIBS     += -losgProducer -lProducer -losgText -losgGA -losgDB -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+INSTFILES = \
+	$(CXXFILES)\
+	GNUmakefile.inst=GNUmakefile
+
+EXEC = osgdistortion
+
+INC +=  $(X_INC)
+
+include $(TOPDIR)/Make/makerules 

examples/osgdistortion/GNUmakefile.inst

@@ -0,0 +1,14 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs
+
+CXXFILES =\
+	osgdistortion.cpp\
+
+LIBS     += -losgProducer -lProducer -losgDB -losgText -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+EXEC = osgdistortion
+
+INC += $(PRODUCER_INCLUDE_DIR) $(X_INC)
+LDFLAGS  += $(PRODUCER_LIB_DIR)
+
+include $(TOPDIR)/Make/makerules

examples/osgdistortion/osgdistortion.cpp

@@ -0,0 +1,330 @@
+#include <osg/GLExtensions>
+#include <osg/Node>
+#include <osg/Geometry>
+#include <osg/Notify>
+#include <osg/MatrixTransform>
+#include <osg/Texture2D>
+#include <osg/Stencil>
+#include <osg/ColorMask>
+#include <osg/Depth>
+#include <osg/Billboard>
+#include <osg/Material>
+#include <osg/Projection>
+
+#include <osgGA/TrackballManipulator>
+#include <osgGA/FlightManipulator>
+#include <osgGA/DriveManipulator>
+
+#include <osgUtil/TransformCallback>
+#include <osgUtil/RenderToTextureStage>
+#include <osgUtil/SmoothingVisitor>
+
+#include <osgDB/Registry>
+#include <osgDB/ReadFile>
+
+#include <osgProducer/Viewer>
+
+class DistortionNode : public osg::Group
+{
+public:
+
+    DistortionNode();
+    
+    DistortionNode(const DistortionNode& rhs,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
+        osg::Group(rhs,copyop) {}
+
+    META_Node(osgDistortion, DistortionNode);
+
+    virtual void traverse(osg::NodeVisitor& nv);
+
+protected:
+
+    void createHUDSubgraph();
+
+    void preRender(osgUtil::CullVisitor& nv);   
+
+    osg::ref_ptr<osg::Node>         _hudSubgraph;
+    osg::ref_ptr<osg::Texture2D>    _texture;    
+    osg::ref_ptr<osg::StateSet>     _localStateSet;
+    
+};
+
+
+DistortionNode::DistortionNode()
+{
+    createHUDSubgraph();
+}
+
+void DistortionNode::createHUDSubgraph()
+{
+    // create the quad to visualize.
+    osg::Geometry* polyGeom = new osg::Geometry();
+
+    polyGeom->setSupportsDisplayList(false);
+
+    osg::Vec3 origin(0.0f,0.0f,0.0f);
+    osg::Vec3 xAxis(1.0f,0.0f,0.0f);
+    osg::Vec3 yAxis(0.0f,1.0f,0.0f);
+    osg::Vec3 zAxis(0.0f,0.0f,1.0f);
+    float height = 1024.0f;
+    float width = 1280.0f;
+    int noSteps = 50;
+    
+    osg::Vec3Array* vertices = new osg::Vec3Array;
+    osg::Vec2Array* texcoords = new osg::Vec2Array;
+    osg::Vec4Array* colors = new osg::Vec4Array;
+
+    osg::Vec3 bottom = origin;
+    osg::Vec3 dx = xAxis*(width/((float)(noSteps-1)));
+    osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
+    
+    osg::Vec2 bottom_texcoord(0.0f,0.0f);
+    osg::Vec2 dx_texcoord(1.0f/(float)(noSteps-1),0.0f);
+    osg::Vec2 dy_texcoord(0.0f,1.0f/(float)(noSteps-1));
+    
+    osg::Vec3 cursor = bottom;
+    osg::Vec2 texcoord = bottom_texcoord;
+    int i,j;
+    for(i=0;i<noSteps;++i)
+    {
+        osg::Vec3 cursor = bottom+dy*(float)i;
+        osg::Vec2 texcoord = bottom_texcoord+dy_texcoord*(float)i;
+        for(j=0;j<noSteps;++j)
+        {
+            vertices->push_back(cursor);
+            texcoords->push_back(osg::Vec2((sin(texcoord.x()*osg::PI-osg::PI*0.5)+1.0f)*0.5f,(sin(texcoord.y()*osg::PI-osg::PI*0.5)+1.0f)*0.5f));
+            colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
+            
+            cursor += dx;
+            texcoord += dx_texcoord;
+        }
+    }
+
+    // pass the created vertex array to the points geometry object.
+    polyGeom->setVertexArray(vertices);
+
+    polyGeom->setColorArray(colors);
+    polyGeom->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
+
+    polyGeom->setTexCoordArray(0,texcoords);
+    
+
+    for(i=0;i<noSteps-1;++i)
+    {
+        osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::QUAD_STRIP);
+        for(j=0;j<noSteps;++j)
+        {
+            elements->push_back(j+(i+1)*noSteps);
+            elements->push_back(j+(i)*noSteps);
+        }
+        polyGeom->addPrimitiveSet(elements);
+    }
+
+
+    // new we need to add the texture to the Drawable, we do so by creating a 
+    // StateSet to contain the Texture StateAttribute.
+    osg::StateSet* stateset = new osg::StateSet;
+
+    osg::Texture2D* texture = new osg::Texture2D;
+//     texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::NEAREST);
+//     texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::NEAREST);
+    texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
+    texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
+    stateset->setTextureAttributeAndModes(0, texture,osg::StateAttribute::ON);
+    stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
+    polyGeom->setStateSet(stateset);
+    
+    _texture = texture;
+
+    osg::Geode* geode = new osg::Geode();
+    geode->addDrawable(polyGeom);
+
+    // create the hud.
+    osg::MatrixTransform* modelview_abs = new osg::MatrixTransform;
+    modelview_abs->setReferenceFrame(osg::Transform::RELATIVE_TO_ABSOLUTE);
+    modelview_abs->setMatrix(osg::Matrix::identity());
+    modelview_abs->addChild(geode);
+
+    osg::Projection* projection = new osg::Projection;
+    projection->setMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
+    projection->addChild(modelview_abs);
+
+    _hudSubgraph = projection;
+    
+    _localStateSet = new osg::StateSet;
+
+
+}
+
+
+void DistortionNode::traverse(osg::NodeVisitor& nv)
+{
+    if (nv.getVisitorType()==osg::NodeVisitor::CULL_VISITOR)
+    {
+        osgUtil::CullVisitor* cullVisitor = dynamic_cast<osgUtil::CullVisitor*>(&nv);
+        if (cullVisitor && _texture.valid() && _hudSubgraph.valid())
+        {
+            preRender(*cullVisitor);
+            
+            _hudSubgraph->accept(nv);
+            
+            return;
+        }
+    }
+    
+    Group::traverse(nv);
+}
+
+void DistortionNode::preRender(osgUtil::CullVisitor& cv)
+{   
+    // create the render to texture stage.
+    osg::ref_ptr<osgUtil::RenderToTextureStage> rtts = new osgUtil::RenderToTextureStage;
+
+    // set up lighting.
+    // currently ignore lights in the scene graph itself..
+    // will do later.
+    osgUtil::RenderStage* previous_stage = cv.getCurrentRenderBin()->_stage;
+
+    // set up the background color and clear mask.
+    rtts->setClearColor(osg::Vec4(0.1f,0.1f,0.3f,1.0f));
+    rtts->setClearMask(previous_stage->getClearMask());
+
+    // set up to charge the same RenderStageLighting is the parent previous stage.
+    rtts->setRenderStageLighting(previous_stage->getRenderStageLighting());
+
+
+    // record the render bin, to be restored after creation
+    // of the render to text
+    osgUtil::RenderBin* previousRenderBin = cv.getCurrentRenderBin();
+
+    // set the current renderbin to be the newly created stage.
+    cv.setCurrentRenderBin(rtts.get());
+
+    cv.pushStateSet(_localStateSet.get());
+
+    {
+
+        // traverse the subgraph
+        Group::traverse(cv);
+
+    }
+
+    cv.popStateSet();
+
+    // restore the previous renderbin.
+    cv.setCurrentRenderBin(previousRenderBin);
+
+    if (rtts->_renderGraphList.size()==0 && rtts->_bins.size()==0)
+    {
+        // getting to this point means that all the subgraph has been
+        // culled by small feature culling or is beyond LOD ranges.
+        return;
+    }
+
+    int height = 1024;
+    int width  = 1024;
+
+
+    const osg::Viewport& viewport = *cv.getViewport();
+
+    // offset the impostor viewport from the center of the main window
+    // viewport as often the edges of the viewport might be obscured by
+    // other windows, which can cause image/reading writing problems.
+    int center_x = viewport.x()+viewport.width()/2;
+    int center_y = viewport.y()+viewport.height()/2;
+
+    osg::Viewport* new_viewport = new osg::Viewport;
+    new_viewport->setViewport(center_x-width/2,center_y-height/2,width,height);
+    rtts->setViewport(new_viewport);
+    
+    _localStateSet->setAttribute(new_viewport);
+
+    // and the render to texture stage to the current stages
+    // dependancy list.
+    cv.getCurrentRenderBin()->_stage->addToDependencyList(rtts.get());
+
+    // if one exist attach texture to the RenderToTextureStage.
+    if (_texture.valid()) rtts->setTexture(_texture.get());
+}
+
+
+int main( int argc, char **argv )
+{
+    // use an ArgumentParser object to manage the program arguments.
+    osg::ArgumentParser arguments(&argc,argv);
+
+    // set up the usage document, in case we need to print out how to use this program.
+    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates pre rendering of scene to a texture, and then apply this texture to geometry.");
+    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
+    arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
+   
+    // construct the viewer.
+    osgProducer::Viewer viewer(arguments);
+
+    // set up the value with sensible default event handlers.
+    viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
+
+    // get details on keyboard and mouse bindings used by the viewer.
+    viewer.getUsage(*arguments.getApplicationUsage());
+
+    // if user request help write it out to cout.
+    if (arguments.read("-h") || arguments.read("--help"))
+    {
+        arguments.getApplicationUsage()->write(std::cout);
+        return 1;
+    }
+
+    // any option left unread are converted into errors to write out later.
+    arguments.reportRemainingOptionsAsUnrecognized();
+
+    // report any errors if they have occured when parsing the program aguments.
+    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;
+    }
+
+    
+    // load the nodes from the commandline arguments.
+    osg::Node* loadedModel = osgDB::readNodeFiles(arguments);
+    if (!loadedModel)
+    {
+//        write_usage(osg::notify(osg::NOTICE),argv[0]);
+        return 1;
+    }
+    
+    // create a transform to spin the model.
+    DistortionNode* distortionNode = new DistortionNode;
+    distortionNode->addChild(loadedModel);
+
+    // add model to the viewer.
+    viewer.setSceneData( distortionNode );
+
+    // create the windows and run the threads.
+    viewer.realize();
+
+    while( !viewer.done() )
+    {
+        // wait for all cull and draw threads to complete.
+        viewer.sync();
+
+        // update the scene by traversing it with the the update visitor which will
+        // call all node update callbacks and animations.
+        viewer.update();
+         
+        // fire off the cull and draw traversals of the scene.
+        viewer.frame();
+        
+    }
+    
+    // wait for all cull and draw threads to complete before exit.
+    viewer.sync();
+
+    return 0;
+}