Minor simplification of the Texture*dData traits
Minor simplification of the Texture*dData traits

TyOverby/glium,caldwell/glium,tomaka/glium,msiglreith/glium,binsoftware/glium,acolley/glium,glium/glium,bvssvni/glium,carbidegames/glium,cpjreynolds/glium,sdotz/glium,rozaliev/glium,christopheraugustus/glium,nicokoch/glium