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tetrahedron =
[ V3 0 0 0, V3 1 0 0, V3 0 1 0
, V3 1 0 0, V3 0 1 0, V3 0 0 1
, V3 0 1 0, V3 0 0 1, V3 0 0 0
, V3 0 0 1, V3 0 0 0, V3 1 0 0
]
f x = (x + sin x + sin (1.1 * x)) `mod` 4 * 2
makeFrame (time :: Float)
(vertexstream :: PrimitiveStream Triangle ((Vec 4 Float)))
= imageFrame (emptyDepthImage 1, emptyColorImage navy)
`overlay` accumulablefragments
where
projmat = perspective 0.1 100.0 (30 * pi / 180) 1.0
.*. lookat (V3 3.0 1.3 0.3) (V3 0.0 0.0 0.0) (V3 0.0 1.0 0.0)
.*. rotMatrixY (pi / 24.0 * time)
accumulablefragments
= vertexstream
& mapPrimitives (\((x)) -> (scale 0.5 (projmat *. x), x))
& rasterizePrimitives (TriangleCtx CullNone PolygonFill NoOffset LastVertex) ((Smooth))
& filterFragments (\((x)) -> True)
& mapFragments (\((x)) -> (((rotMatrixZ time *. rotMatrixY time *. x) *! f time)))
& accumulateWith (DepthOp Less True, ColorOp NoBlending (V4 True True True True))
main = renderFrame $
makeFrame (Uniform "Time")
tetrahedronStream
tetrahedronStream = fetchArrays ((map (\v -> V4 v%x v%y v%z 1) tetrahedron))
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