Easily load images, videos, etc. into quads

[rpavlik]

Some code from Node* osgDB::readNodeFiles(osg::ArgumentParser& arguments,const ReaderWriter::Options* options):

 while (arguments.read("--image",filename))
 {
 osg::ref_ptr<osg::Image> image = readImageFile(filename.c_str(), options);
 if (image.valid())
 {
 osg::Geode* geode = osg::createGeodeForImage(image.get());

 if (image->isImageTranslucent())
 {
 osg::notify()<<"Image "<<image->getFileName()<<" is translucent; setting up blending."<<std::endl;
 geode->getOrCreateStateSet()->setMode(GL_BLEND, osg::StateAttribute::ON);
 geode->getOrCreateStateSet()->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
 }

 nodeList.push_back(geode);
 }
 }

 while (arguments.read("--movie",filename))
 {
 osg::ref_ptr<osg::Image> image = readImageFile(filename.c_str(), options);
 osg::ref_ptr<osg::ImageStream> imageStream = dynamic_cast<osg::ImageStream*>(image.get());
 if (imageStream.valid())
 {
 // start the stream playing.
 imageStream->play();

 osg::ref_ptr<osg::Geometry> pictureQuad = 0;

 bool useTextureRectangle = true;
 if (useTextureRectangle)
 {
 pictureQuad = osg::createTexturedQuadGeometry(osg::Vec3(0.0f,0.0f,0.0f),
 osg::Vec3(image->s(),0.0f,0.0f),
 osg::Vec3(0.0f,0.0f,image->t()),
 0.0f,image->t(), image->s(),0.0f);

 pictureQuad->getOrCreateStateSet()->setTextureAttributeAndModes(0,
 new osg::TextureRectangle(image.get()),
 osg::StateAttribute::ON);
 }
 else
 {
 pictureQuad = osg::createTexturedQuadGeometry(osg::Vec3(0.0f,0.0f,0.0f),
 osg::Vec3(image->s(),0.0f,0.0f),
 osg::Vec3(0.0f,0.0f,image->t()),
 0.0f,0.0f, 1.0f,1.0f);

 pictureQuad->getOrCreateStateSet()->setTextureAttributeAndModes(0,
 new osg::Texture2D(image.get()),
 osg::StateAttribute::ON);
 }

 if (pictureQuad.valid())
 {
 osg::ref_ptr<osg::Geode> geode = new osg::Geode;
 geode->addDrawable(pictureQuad.get());
 nodeList.push_back(geode.get());

 }
 }
 else if (image.valid())
 {
 nodeList.push_back(osg::createGeodeForImage(image.get()));
 }
 }

 while (arguments.read("--dem",filename))
 {
 osg::HeightField* hf = readHeightFieldFile(filename.c_str(), options);
 if (hf)
 {
 osg::Geode* geode = new osg::Geode;
 geode->addDrawable(new osg::ShapeDrawable(hf));
 nodeList.push_back(geode);
 }
 }