#include #include #include #include #include #include #include #include #include using namespace osg; using namespace osgUtil; SceneView::SceneView(DisplaySettings* ds) { _displaySettings = ds; _calc_nearfar = true; _backgroundColor.set(0.2f, 0.2f, 0.4f, 1.0f); _near_plane = 1.0f; _far_plane = 1.0f; _lodBias = 1.0f; _lightingMode=HEADLIGHT; _prioritizeTextures = false; _viewport = new Viewport; _initCalled = false; } SceneView::~SceneView() { } void SceneView::setDefaults() { _globalState = new osg::StateSet; _lightingMode=HEADLIGHT; _light = new osg::Light; _light->setLightNum(0); _light->setAmbient(Vec4(0.00f,0.0f,0.00f,1.0f)); _light->setDiffuse(Vec4(0.8f,0.8f,0.8f,1.0f)); _light->setSpecular(Vec4(1.0f,1.0f,1.0f,1.0f)); _state = new State; _camera = new Camera(_displaySettings.get()); _rendergraph = new RenderGraph; _renderStage = new RenderStage; #ifndef __sgi // sgi's IR graphics has a problem with lighting and display lists, as it seems to store // lighting state with the display list, and the display list visitor doesn't currently apply // state before creating display lists. So will disable the init visitor default, this won't // affect functionality since the display lists will be created as and when needed. DisplayListVisitor* dlv = new DisplayListVisitor(); dlv->setState(_state.get()); _initVisitor = dlv; #endif _appVisitor = new AppVisitor; _cullVisitor = new CullVisitor; _cullVisitor->setRenderGraph(_rendergraph.get()); _cullVisitor->setRenderStage(_renderStage.get()); _globalState->setGlobalDefaults(); // enable lighting by default. _globalState->setMode(GL_LIGHTING, osg::StateAttribute::ON); _light->setStateSetModes(*_globalState,osg::StateAttribute::ON); // enable depth testing by default. _globalState->setMode(GL_DEPTH_TEST, osg::StateAttribute::ON); // set up an alphafunc by default to speed up blending operations. osg::AlphaFunc* alphafunc = new osg::AlphaFunc; alphafunc->setFunction(osg::AlphaFunc::GREATER,0.0f); _globalState->setAttributeAndModes(alphafunc, osg::StateAttribute::ON); // set up an alphafunc by default to speed up blending operations. osg::TexEnv* texenv = new osg::TexEnv; texenv->setMode(osg::TexEnv::MODULATE); _globalState->setAttributeAndModes(texenv, osg::StateAttribute::ON); _backgroundColor.set(0.2f, 0.2f, 0.4f, 1.0f); } void SceneView::init() { _initCalled = true; if (_sceneData.valid() && _initVisitor.valid()) { _initVisitor->reset(); _initVisitor->setFrameStamp(_frameStamp.get()); if (_frameStamp.valid()) { _initVisitor->setTraversalNumber(_frameStamp->getFrameNumber()); } _sceneData->accept(*_initVisitor.get()); } } void SceneView::app() { if (!_initCalled) init(); if (_sceneData.valid() && _appVisitor.valid()) { _appVisitor->reset(); _appVisitor->setFrameStamp(_frameStamp.get()); // use the frame number for the traversal number. if (_frameStamp.valid()) { _appVisitor->setTraversalNumber(_frameStamp->getFrameNumber()); } _sceneData->accept(*_appVisitor.get()); } } void SceneView::cull() { if (_displaySettings.valid() && _displaySettings->getStereo()) { _camera->setScreenDistance(_displaySettings->getScreenDistance()); _cameraLeft = new osg::Camera(*_camera); _cameraRight = new osg::Camera(*_camera); float iod = _displaySettings->getEyeSeperation(); _cameraLeft->adjustEyeOffsetForStereo(osg::Vec3(-iod*0.5,0.0f,0.0f)); _cameraRight->adjustEyeOffsetForStereo(osg::Vec3(iod*0.5,0.0f,0.0f)); if (!_cullVisitorLeft.valid()) _cullVisitorLeft = dynamic_cast(_cullVisitor->cloneType()); if (!_rendergraphLeft.valid()) _rendergraphLeft = dynamic_cast(_rendergraph->cloneType()); if (!_renderStageLeft.valid()) _renderStageLeft = dynamic_cast(_renderStage->cloneType()); if (!_cullVisitorRight.valid()) _cullVisitorRight = dynamic_cast(_cullVisitor->cloneType()); if (!_rendergraphRight.valid()) _rendergraphRight = dynamic_cast(_rendergraph->cloneType()); if (!_renderStageRight.valid()) _renderStageRight = dynamic_cast(_renderStage->cloneType()); cullStage(_cameraLeft.get(),_cullVisitorLeft.get(),_rendergraphLeft.get(),_renderStageLeft.get()); cullStage(_cameraRight.get(),_cullVisitorRight.get(),_rendergraphRight.get(),_renderStageRight.get()); } else { cullStage(_camera.get(),_cullVisitor.get(),_rendergraph.get(),_renderStage.get()); } } void SceneView::cullStage(osg::Camera* camera, osgUtil::CullVisitor* cullVisitor, osgUtil::RenderGraph* rendergraph, osgUtil::RenderStage* renderStage) { if (!_sceneData || !_viewport->valid()) return; if (!_initCalled) init(); camera->adjustAspectRatio(_viewport->aspectRatio()); cullVisitor->reset(); cullVisitor->setFrameStamp(_frameStamp.get()); // use the frame number for the traversal number. if (_frameStamp.valid()) { cullVisitor->setTraversalNumber(_frameStamp->getFrameNumber()); } // get the camera's modelview osg::Matrix* modelview = new osg::Matrix(camera->getModelViewMatrix()); // take a copy of camera, and init it home osg::Camera* local_camera = new Camera(*camera); local_camera->home(); local_camera->attachTransform(osg::Camera::NO_ATTACHED_TRANSFORM); cullVisitor->setLODBias(_lodBias); cullVisitor->setCamera(*local_camera); cullVisitor->setViewport(_viewport.get()); cullVisitor->setEarthSky(NULL); // reset earth sky on each frame. cullVisitor->setRenderGraph(rendergraph); cullVisitor->setRenderStage(renderStage); // SandB //now make it compute "clipping directions" needed for detailed culling if(cullVisitor->getDetailedCulling()) cullVisitor->calcClippingDirections();//only once pre frame renderStage->reset(); // comment out reset of rendergraph since clean is more efficient. // rendergraph->reset(); // use clean of the rendergraph rather than reset, as it is able to // reuse the structure on the rendergraph in the next frame. This // achieves a certain amount of frame cohereancy of memory allocation. rendergraph->clean(); renderStage->setViewport(_viewport.get()); renderStage->setCamera(local_camera); renderStage->setClearColor(_backgroundColor); switch(_lightingMode) { case(HEADLIGHT): renderStage->addLight(_light.get(),NULL); break; case(SKY_LIGHT): renderStage->addLight(_light.get(),modelview); break; case(NO_SCENEVIEW_LIGHT): break; } if (_globalState.valid()) cullVisitor->pushStateSet(_globalState.get()); cullVisitor->pushCullViewState(modelview); // traverse the scene graph to generate the rendergraph. _sceneData->accept(*cullVisitor); if (_globalState.valid()) cullVisitor->popStateSet(); cullVisitor->popCullViewState(); const osg::EarthSky* earthSky = cullVisitor->getEarthSky(); if (earthSky) { if (earthSky->getRequiresClear()) { renderStage->setClearColor(earthSky->getClearColor()); renderStage->setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); // really should set clear mask here, but what to? Need // to consider the stencil and accumulation buffers.. // will defer to later. Robert Osfield. October 2001. } else { // we have an earth sky implementation to do the work for use // so we don't need to clear. renderStage->setClearMask(0); } } if (_calc_nearfar) { _near_plane = cullVisitor->getCalculatedNearPlane(); _far_plane = cullVisitor->getCalculatedFarPlane(); if (_near_plane<=_far_plane) { // shift the far plane slight further away from the eye point. // and shift the near plane slightly near the eye point, this // will give a little space betwenn the near and far planes // and the model, crucial when the naer and far planes are // coincedent. _far_plane *= 1.05; _near_plane *= 0.95; // if required clamp the near plane to prevent negative or near zero // near planes. if(!cullVisitor->getDetailedCulling()) { float min_near_plane = _far_plane*0.0005f; if (_near_planesetNearFar(_near_plane,_far_plane); camera->setNearFar(_near_plane,_far_plane); } // prune out any empty RenderGraph children. // note, this would be not required if the rendergraph had been // reset at the start of each frame (see top of this method) but // a clean has been used instead to try to minimize the amount of // allocation and deleteing of the RenderGraph nodes. rendergraph->prune(); } void SceneView::draw() { if (_displaySettings.valid() && _displaySettings->getStereo()) { _camera->setScreenDistance(_displaySettings->getScreenDistance()); switch(_displaySettings->getStereoMode()) { case(osg::DisplaySettings::QUAD_BUFFER): { glDrawBuffer(GL_BACK_LEFT); drawStage(_renderStageLeft.get()); glDrawBuffer(GL_BACK_RIGHT); drawStage(_renderStageRight.get()); } break; case(osg::DisplaySettings::ANAGLYPHIC): { osg::ref_ptr red = new osg::ColorMask; osg::ref_ptr green = new osg::ColorMask; red->setMask(true,false,false,true); green->setMask(false,true,true,true); // draw left eye. _globalState->setAttribute(red.get()); _renderStageLeft->setColorMask(red.get()); drawStage(_renderStageLeft.get()); // draw right eye. _globalState->setAttribute(green.get()); _renderStageRight->setColorMask(green.get()); drawStage(_renderStageRight.get()); } break; default: { osg::notify(osg::NOTICE)<<"Warning: stereo camera mode not implemented yet."<< std::endl; drawStage(_renderStageLeft.get()); } break; } } else { // bog standard draw. drawStage(_renderStage.get()); } } void SceneView::drawStage(osgUtil::RenderStage* renderStage) { if (!_sceneData || !_viewport->valid()) return; if (!_state) { osg::notify(osg::WARN) << "Warning: no valid osgUtil::SceneView::_state"<< std::endl; osg::notify(osg::WARN) << " creating a state automatically."<< std::endl; // note the constructor for osg::State will set ContextID to 0. _state = new osg::State; } // we in theory should be able to _state->reset(); _state->setFrameStamp(_frameStamp.get()); _state->setDisplaySettings(_displaySettings.get()); // note, to support multi-pipe systems the deletion of OpenGL display list // and texture objects is deferred until the OpenGL context is the correct // context for when the object were originally created. Here we know what // context we are in so can flush the appropriate caches. osg::Drawable::flushDeletedDisplayLists(_state->getContextID()); osg::Texture::flushDeletedTextureObjects(_state->getContextID()); RenderLeaf* previous = NULL; renderStage->draw(*_state,previous); GLenum errorNo = glGetError(); if (errorNo!=GL_NO_ERROR) { osg::notify(WARN)<<"Warning: detected OpenGL error '"<unproject(window,*_viewport,object); } /** Calculate, via glUnProject, the object coordinates of a window x,y when projected onto the near and far planes. Note, current implementation requires that SceneView::draw() has been previously called for projectWindowIntoObject to produce valid values. As per OpenGL windows coordinates are calculated relative to the bottom left of the window.*/ bool SceneView::projectWindowXYIntoObject(int x,int y,osg::Vec3& near_point,osg::Vec3& far_point) const { bool result_near = _camera->unproject(Vec3(x,y,0.0f),*_viewport,near_point); bool result_far = _camera->unproject(Vec3(x,y,1.0f),*_viewport,far_point); return result_near & result_far; } /** Calculate, via glProject, the object coordinates of a window. Note, current implementation requires that SceneView::draw() has been previously called for projectWindowIntoObject to produce valid values. As per OpenGL windows coordinates are calculated relative to the bottom left of the window.*/ bool SceneView::projectObjectIntoWindow(const osg::Vec3& object,osg::Vec3& window) const { return _camera->project(object,*_viewport,window); }