C++ osg::Drawable类代码示例

void SimpleDotVisitor::handle(osg::Drawable &drawable, int id)
{
    std::stringstream label;

    label << "<top> " << drawable.className();
    if (!drawable.getName().empty())
    {
        label << "| " << drawable.getName();
    }

    drawNode(id, "record", "solid", label.str(), "blue", "white");
}

    void apply(osg::Drawable& geom)
    {
        if (_hardware) {
            osgAnimation::RigGeometry* rig = dynamic_cast<osgAnimation::RigGeometry*>(&geom);
            if (rig)
                rig->setRigTransformImplementation(new MyRigTransformHardware);
        }

#if 0
        if (geom.getName() != std::string("BoundingBox")) // we disable compute of bounding box for all geometry except our bounding box
            geom.setComputeBoundingBoxCallback(new osg::Drawable::ComputeBoundingBoxCallback);
//            geom.setInitialBound(new osg::Drawable::ComputeBoundingBoxCallback);
#endif
    }

void GLObjectsVisitor::apply(osg::Drawable& drawable)
{
    if (_drawablesAppliedSet.count(&drawable)!=0) return;

    if (_checkGLErrors==osg::State::ONCE_PER_ATTRIBUTE) _renderInfo.getState()->checkGLErrors("start of Drawable::apply(osg::Drawable& drawable)");

    _drawablesAppliedSet.insert(&drawable);

    if (drawable.getStateSet())
    {
        apply(*(drawable.getStateSet()));
    }

    if (_mode&SWITCH_OFF_DISPLAY_LISTS)
    {
        drawable.setUseDisplayList(false);
    }

    if (_mode&SWITCH_ON_DISPLAY_LISTS)
    {
        drawable.setUseDisplayList(true);
    }

    if (_mode&SWITCH_ON_VERTEX_BUFFER_OBJECTS)
    {
        drawable.setUseVertexBufferObjects(true);
    }

    if (_mode&SWITCH_OFF_VERTEX_BUFFER_OBJECTS)
    {
        drawable.setUseVertexBufferObjects(false);
    }

    if (_mode&COMPILE_DISPLAY_LISTS && _renderInfo.getState() &&
        (drawable.getUseDisplayList() || drawable.getUseVertexBufferObjects()))
    {

        drawable.compileGLObjects(_renderInfo);

        if (_checkGLErrors==osg::State::ONCE_PER_ATTRIBUTE) _renderInfo.getState()->checkGLErrors("after drawable.compileGLObjects() call in Drawable::apply(osg::Drawable& drawable)  ");
    }


    if (_mode&RELEASE_DISPLAY_LISTS)
    {
        drawable.releaseGLObjects(_renderInfo.getState());
    }
}

void
VertexCacheOptimizer::apply(osg::Drawable& drawable)
{
    if (drawable.getDataVariance() == osg::Object::DYNAMIC)
        return;

    osg::Geometry* geom = drawable.asGeometry();

    if ( geom )
    {
        if ( geom->getDataVariance() == osg::Object::DYNAMIC )
            return;

        // vertex cache optimizations currently only support surface geometries.
        // all or nothing in the geode.
        osg::Geometry::PrimitiveSetList& psets = geom->getPrimitiveSetList();
        for( osg::Geometry::PrimitiveSetList::iterator i = psets.begin(); i != psets.end(); ++i )
        {
            switch( (*i)->getMode() )
            {
            case GL_TRIANGLES:
            case GL_TRIANGLE_FAN:
            case GL_TRIANGLE_STRIP:
            case GL_QUADS:
            case GL_QUAD_STRIP:
            case GL_POLYGON:
                break;

            default:
                return;
            }
        }
    }

    //OE_NOTICE << LC << "VC optimizing..." << std::endl;

    // passed the test; run the optimizer.
    osgUtil::VertexCacheVisitor vcv;
    drawable.accept( vcv );
    vcv.optimizeVertices();

    osgUtil::VertexAccessOrderVisitor vaov;
    drawable.accept( vaov );
    vaov.optimizeOrder();

    traverse( drawable );
}

// decompose Drawable primitives into triangles, print out these triangles and computed normals.
void printTriangles(const std::string& name, osg::Drawable& drawable)
{
    std::cout<<name<<std::endl;

    osg::TriangleFunctor<NormalPrint> tf;
    drawable.accept(tf);

    std::cout<<std::endl;
}

void GLObjectsVisitor::apply(osg::Drawable& drawable)
{
    if (_drawablesAppliedSet.count(&drawable)!=0) return;

    _drawablesAppliedSet.insert(&drawable);

    if (_mode&SWITCH_OFF_DISPLAY_LISTS)
    {
        drawable.setUseDisplayList(false);
    }

    if (_mode&SWITCH_ON_DISPLAY_LISTS)
    {
        drawable.setUseDisplayList(true);
    }

    if (_mode&SWITCH_ON_VERTEX_BUFFER_OBJECTS)
    {
        drawable.setUseVertexBufferObjects(true);
    }

    if (_mode&SWITCH_OFF_VERTEX_BUFFER_OBJECTS)
    {
        drawable.setUseVertexBufferObjects(false);
    }

    if (_mode&COMPILE_DISPLAY_LISTS && _renderInfo.getState() &&
        (drawable.getUseDisplayList() || drawable.getUseVertexBufferObjects()))
    {
        drawable.compileGLObjects(_renderInfo);
    }

    if (_mode&RELEASE_DISPLAY_LISTS)
    {
        drawable.releaseGLObjects(_renderInfo.getState());
    }

    if (drawable.getStateSet())
    {
        apply(*(drawable.getStateSet()));
    }
}

CullVisitor::value_type CullVisitor::computeNearestPointInFrustum(const osg::Matrix& matrix, const osg::Polytope::PlaneList& planes,const osg::Drawable& drawable)
{
    // OSG_WARN<<"CullVisitor::computeNearestPointInFrustum("<<getTraversalNumber()<<"\t"<<planes.size()<<std::endl;

    osg::TriangleFunctor<ComputeNearestPointFunctor> cnpf;
    cnpf.set(_computed_znear, matrix, &planes);
    
    drawable.accept(cnpf);

    return cnpf._znear;
}

    virtual void apply(osg::Drawable &drawable)
    {
        if (!mTriangleMesh)
            mTriangleMesh.reset(new btTriangleMesh);

        osg::Matrixf worldMat = osg::computeLocalToWorld(getNodePath());
        osg::TriangleFunctor<GetTriangleFunctor> functor;
        functor.setTriMesh(mTriangleMesh.get());
        functor.setMatrix(worldMat);
        drawable.accept(functor);
    }

void ShaderGenVisitor::apply(osg::Drawable &drawable)
{
    osg::StateSet *stateSet = drawable.getStateSet();
    if (stateSet)
        _state->pushStateSet(stateSet);

    update(&drawable);

    if (stateSet)
        _state->popStateSet();
}

void StatsVisitor::apply(osg::Drawable& drawable)
{
    if (drawable.getStateSet())
    {
        ++_numInstancedStateSet;
        _statesetSet.insert(drawable.getStateSet());
    }

    ++_numInstancedDrawable;

    drawable.accept(_instancedStats);

    _drawableSet.insert(&drawable);

    osg::Geometry* geometry = dynamic_cast<osg::Geometry*>(&drawable);
    if (geometry)
    {
        ++_numInstancedGeometry;
        _geometrySet.insert(geometry);
    }
}

void
BuildTopologyVisitor::apply(osg::Drawable& drawable)
{
    osg::Geometry* geom = drawable.asGeometry();
    if (geom)
    {
        osg::Vec3Array* verts = dynamic_cast<osg::Vec3Array*>(geom->getVertexArray());
        if (verts)
        {
            apply(&drawable, verts);
        }
    }
}

    void ShaderVisitor::apply(osg::Drawable& drawable)
    {
        // non-Geometry drawable (e.g. particle system)
        bool needPop = (drawable.getStateSet() != NULL);

        if (drawable.getStateSet())
        {
            pushRequirements();
            applyStateSet(drawable.getStateSet(), drawable);
        }

        if (!mRequirements.empty())
        {
            const ShaderRequirements& reqs = mRequirements.back();
            // TODO: find a better place for the stateset
            if (reqs.mShaderRequired || mForceShaders)
                createProgram(reqs, drawable);
        }

        if (needPop)
            popRequirements();
    }

void
AllocateAndMergeBufferObjectsVisitor::apply(osg::Drawable& drawable)
{
    osg::Geometry* geom = drawable.asGeometry();
    if ( geom )
    {
        // We disable vbo's and then re-enable them to enable sharing of all the arrays.
        geom->setUseDisplayList( false );
        geom->setUseVertexBufferObjects( false );
        geom->setUseVertexBufferObjects( true );
    }
    traverse(drawable);
}

void StatsVisitor::apply(osg::Drawable& drawable)
{
    if (drawable.getStateSet())
    {
        apply(*drawable.getStateSet());
    }

    ++_numInstancedDrawable;

    drawable.accept(_instancedStats);

    _drawableSet.insert(&drawable);

    osg::Geometry* geometry = drawable.asGeometry();
    if (geometry)
    {
        ++_numInstancedGeometry;
        _geometrySet.insert(geometry);

        ++_numInstancedFastGeometry;
        _fastGeometrySet.insert(geometry);
    }
}

bool CullVisitor::updateCalculatedNearFar(const osg::Matrix& matrix,const osg::Drawable& drawable, bool isBillboard)
{
    const osg::BoundingBox& bb = drawable.getBound();

    value_type d_near, d_far;

    if (isBillboard)
    {
    
#ifdef TIME_BILLBOARD_NEAR_FAR_CALCULATION    
        static unsigned int lastFrameNumber = getTraversalNumber();
        static unsigned int numBillboards = 0;
        static double elapsed_time = 0.0;
        if (lastFrameNumber != getTraversalNumber())
        {
            OSG_NOTICE<<"Took "<<elapsed_time<<"ms to test "<<numBillboards<<" billboards"<<std::endl;
            numBillboards = 0;
            elapsed_time = 0.0;
            lastFrameNumber = getTraversalNumber();
        }
        osg::Timer_t start_t = osg::Timer::instance()->tick();
#endif
        
        osg::Vec3 lookVector(-matrix(0,2),-matrix(1,2),-matrix(2,2));

        unsigned int bbCornerFar = (lookVector.x()>=0?1:0) +
                       (lookVector.y()>=0?2:0) +
                       (lookVector.z()>=0?4:0);

        unsigned int bbCornerNear = (~bbCornerFar)&7;

        d_near = distance(bb.corner(bbCornerNear),matrix);
        d_far = distance(bb.corner(bbCornerFar),matrix);

        OSG_NOTICE.precision(15);

        if (false)
        {

            OSG_NOTICE<<"TESTING Billboard near/far computation"<<std::endl;

             // OSG_WARN<<"Checking corners of billboard "<<std::endl;
            // deprecated brute force way, use all corners of the bounding box.
            value_type nd_near, nd_far;
            nd_near = nd_far = distance(bb.corner(0),matrix);
            for(unsigned int i=0;i<8;++i)
            {
                value_type d = distance(bb.corner(i),matrix);
                if (d<nd_near) nd_near = d;
                if (d>nd_far) nd_far = d;
                OSG_NOTICE<<"\ti="<<i<<"\td="<<d<<std::endl;
            }

            if (nd_near==d_near && nd_far==d_far)
            {
                OSG_NOTICE<<"\tBillboard near/far computation correct "<<std::endl;
            }
            else
            {
                OSG_NOTICE<<"\tBillboard near/far computation ERROR\n\t\t"<<d_near<<"\t"<<nd_near
                                        <<"\n\t\t"<<d_far<<"\t"<<nd_far<<std::endl;
            }

        }

#ifdef TIME_BILLBOARD_NEAR_FAR_CALCULATION    
        osg::Timer_t end_t = osg::Timer::instance()->tick();
        
        elapsed_time += osg::Timer::instance()->delta_m(start_t,end_t);
        ++numBillboards;
#endif
    }
    else
    {
        // efficient computation of near and far, only taking into account the nearest and furthest
        // corners of the bounding box.
        d_near = distance(bb.corner(_bbCornerNear),matrix);
        d_far = distance(bb.corner(_bbCornerFar),matrix);
    }
    
    if (d_near>d_far)
    {
        std::swap(d_near,d_far);
        if ( !EQUAL_F(d_near, d_far) ) 
        {
            OSG_WARN<<"Warning: CullVisitor::updateCalculatedNearFar(.) near>far in range calculation,"<< std::endl;
            OSG_WARN<<"         correcting by swapping values d_near="<<d_near<<" dfar="<<d_far<< std::endl;
        }
    }

    if (d_far<0.0)
    {
        // whole object behind the eye point so discard
        return false;
    }

    if (d_near<_computed_znear) 
    {
        if (_computeNearFar==COMPUTE_NEAR_FAR_USING_PRIMITIVES)
        {
//.........这里部分代码省略.........