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clear = FrameBuffer $ ColorImage @1 red -- ...
triangleRasterCtx = TriangleCtx CullNone PolygonFill NoOffset LastVertex
colorFragmentCtx = accumulationContext (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
transform s f = mapPrimitives (\v -> f v) s
rotate :: Float -> Vec 4 Float -> Vec 4 Float
rotate a v = M44F (V4 c (-s) 0 0) (V4 s c 0 0) (V4 0 0 1 0) (V4 0 0 0 1) `PrimMulMatVec` v
where
c = PrimCos a
s = PrimSin a
main = cubeVertexStream -- cube vertices
`transform` (scale 0.1 . rotate 3) -- scale them
& rasterizeWith triangles () -- rasterize
`mapFragments2` const blue -- set every pixel blue
& ScreenOut -- draw into screen
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