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lineVertices :: [Vec 3 Float]
lineVertices = concat [[V3 i 0 0,V3 (i+!1.0) 0 0] | i <- [(-2)..2]]
clear = FrameBuffer $ (DepthImage @1 1000, ColorImage @1 navy) -- ...
lines = LineCtx 1.0 LastVertex
colorFragmentCtx = (DepthOp Less True, ColorOp NoBlending (V4 True True True True))
cubeVertexStream = fetchArrays Line (lineVertices)
rasterizeWith = rasterizePrimitives
mapFragments2 s fs = accumulate colorFragmentCtx (\a -> fs a) s clear
transform s f = mapPrimitives (\(p) -> let v = v3FToV4F p in (f v, v)) s
rotate' v = (Uniform "MVP" :: Mat 4 4 Float) *. v
main = cubeVertexStream -- cube vertices
`transform` (scale 0.5 . rotate') -- scale them
& rasterizeWith lines Smooth -- rasterize
`mapFragments2` id
& ScreenOut -- draw into screen
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