implementation(int index, const video_format_desc& format_desc, ogl_device& ogl) \r
: context_(index, ogl, format_desc)\r
, diag_(diagnostics::create_graph(narrow(print())))\r
implementation(int index, const video_format_desc& format_desc, ogl_device& ogl) \r
: context_(index, ogl, format_desc)\r
, diag_(diagnostics::create_graph(narrow(print())))\r