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clear = imageFrame (DepthImage @1 1000, ColorImage @1 black) -- ...
triangleRasterCtx = TriangleCtx CullNone PolygonFill NoOffset LastVertex
colorFragmentCtx = (DepthOp Less True, ColorOp NoBlending (V4 True True True True))
cubeVertexStream = fetch "stream4" Triangle (Attribute "position4" :: Vec 4 Float, Attribute "vertexUV" :: Vec 2 Float)
rotate' v = (Uniform "MVP" :: Mat 4 4 Float) *. v
setAlpha v = v * V4 1.0 1.0 1 0 + V4 0 0 0 1 --V4 v%x v%y v%z 1.0
cube' (n :: Float) fb =
clear
`overlay`
cubeVertexStream
& mapPrimitives (\(v, u) -> (rotate' $ scale 0.5 $ rotMatrixX (n/10) *. v, u))
& rasterizePrimitives triangleRasterCtx Smooth
& mapFragments (\a -> setAlpha $ (a%xyxx *! 0.7 + texture2D sampler a) *! 0.7)
& accumulateWith colorFragmentCtx
where sampler = Sampler LinearFilter MirroredRepeat $ Texture2D (V2 256 256) (PrjImageColor fb)
main :: Output
main = ScreenOut $ snd (iterate (\(n, f) -> (n+1, cube' n f)) (0, clear) !! 15)
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