petrockblog/RetroPie-Setup — pull request #269 by gizmo98 (2014-02-18 19:30:10+00:00)
Title: Enable threaded_video, change default shaders...

...let shader preset decide if bilinear filtering (video_smooth) is necessary.

And please add the newer brighter phosphor.glslp:
http://blog.petrockblock.com/forums/topic/video-filters-scanlinesntsc/#post-4996