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vertices :: [(Vec 3 Float,Vec 4 Float)]
vertices = concat [[v i,v (i+!1.0)] | i <- [(-2)..2]]
where v x = (V3 x 0.0 0.0,red)
clear = FrameBuffer $ (DepthImage @1 1000, ColorImage @1 navy) -- ...
lines = LineCtx 1.0 LastVertex
points = PointCtx (ProgramPointSize $ \_ -> 30.0) 1.0 LowerLeft
colorFragmentCtx = (DepthOp Less True, ColorOp NoBlending (V4 True True True True))
cubeVertexStream = fetchArrays Point (unzip vertices)
mapFragments2 s fs = accumulate colorFragmentCtx (\a -> fs a) s clear
rotate' v = (Uniform "MVP" :: Mat 4 4 Float) *. v
main = cubeVertexStream -- cube vertices
& mapPrimitives (\(p,c) -> (scale 0.5 . rotate' $ v3FToV4F p, c))
& rasterizePrimitives points Smooth -- rasterize
`mapFragments2` id
& ScreenOut -- draw into screen
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