Fix deprecations (#48)

Author: femtocleaner[bot]

src/core.jl

@@ -52,4 +52,4 @@ end
 Create a new rectangle with x,y == 0,0 while taking the widths from the original
 Rectangle
 """
-zeroposition{T}(r::SimpleRectangle{T}) = SimpleRectangle(zero(T), zero(T), r.w, r.h)
+zeroposition(r::SimpleRectangle{T}) where {T} = SimpleRectangle(zero(T), zero(T), r.w, r.h)

src/events.jl

@@ -95,7 +95,7 @@ Selection of random objects on the screen is realized by rendering an
 object id + plus an arbitrary index into the framebuffer.
 The index can be used for e.g. instanced geometries.
 """
-immutable SelectionID{T <: Integer} <: FieldVector{2, T}
+struct SelectionID{T <: Integer} <: FieldVector{2, T}
     id::T
     index::T
     # function SelectionID(args::NTuple{2, T})

src/screen.jl

@@ -552,7 +552,7 @@ function abs_area(s::Screen)
     area
 end
 
-function Base.push!{Pre}(screen::Screen, robj::RenderObject{Pre})
+function Base.push!(screen::Screen, robj::RenderObject{Pre}) where Pre
     # since fxaa is the default, if :fxaa not in uniforms --> needs fxaa
     sym = Bool(get(robj.uniforms, :fxaa, true)) ? :renderlist_fxaa : :renderlist
     # find renderlist specialized to current prerender function

src/types.jl

@@ -75,7 +75,7 @@ function postprocess(color, color_luma, framebuffer_size)
     (pass1, pass2, pass3)
 end
 
-function attach_framebuffer{T}(t::Texture{T, 2}, attachment)
+function attach_framebuffer(t::Texture{T, 2}, attachment) where T
     glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, GL_TEXTURE_2D, t.id, 0)
 end