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makeFrame (time :: Float)
(vertexstream :: PrimitiveStream Triangle ((Vec 4 Float)))
= foldl' overlay (imageFrame (emptyDepthImage 1, emptyColorImage navy))
$ map (f . (/10)) [ 1 .. 10 ]
where
f sc =
vertexstream
& mapPrimitives (\((x)) -> (scale sc x, x))
& rasterizePrimitives (TriangleCtx CullNone PolygonFill NoOffset LastVertex) ((Smooth))
& filterFragments ffilter
& mapFragments (\((x)) -> ((V4 sc' sc' sc' 1)))
& accumulateWith (DepthOp Less True, ColorOp NoBlending (V4 True True True True))
where
sc' = 1 - sc
ffilter ((v)) = sin (10 * (rotMatrixY (time) *. rotMatrixZ (time * sc) *. v)%x) > 0.5
main = renderFrame $
makeFrame (Uniform "Time")
(fetch "stream4" (Attribute "position4"))
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