Add the empty, empty_with_mipmaps and empty_with_format functions
Add the empty, empty_with_mipmaps and empty_with_format functions

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