Updated from OpenSceneGraph-Data/shaders/text_sdf.frag to add support for SHADOW
Updated from OpenSceneGraph-Data/shaders/text_sdf.frag to add support for SHADOW

openscenegraph/osg,scrawl/osg,scrawl/osg,scrawl/osg,openscenegraph/osg,openscenegraph/osg,scrawl/osg,openscenegraph/osg