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dark = V4 0.1 0.0 0.2 1
clear = FrameBuffer $ (DepthImage @1 1000, ColorImage @1 dark) -- ...
triangleRasterCtx = TriangleCtx CullNone PolygonFill NoOffset LastVertex
colorFragmentCtx = (DepthOp Less True, ColorOp NoBlending (V4 True True True True))
rasterizeWith = rasterizePrimitives
triangles = triangleRasterCtx
cubeVertexStream = fetch "stream4" Triangle (Attribute "position4" :: Vec 4 Float)
mapFragments2 s fs = accumulate colorFragmentCtx (\a -> fs a) s clear
rotate' v = (Uniform "MVP" :: Mat 4 4 Float) `PrimMulMatVec` v
main = cubeVertexStream -- cube vertices
& mapPrimitives (\v -> (scale 0.5 . rotate' $ v, v))
& rasterizeWith triangles Smooth -- rasterize
`mapFragments2` id -- set every pixel blue
& ScreenOut -- draw into screen
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