perform y-inversion
perform y-inversion

cbratschi/aminogfx-gl,joshmarinacci/aminogfx-gl,joshmarinacci/aminogfx-gl,cbratschi/aminogfx-gl,joshmarinacci/aminogfx-gl,cbratschi/aminogfx-gl,cbratschi/aminogfx-gl,cbratschi/aminogfx-gl,joshmarinacci/aminogfx-gl,joshmarinacci/aminogfx-gl