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clear' = FrameBuffer $ (DepthImage @1 1000, ColorImage @1 navy) -- ...
clear = FrameBuffer $ (DepthImage @1 1000, ColorImage @1 maroon) -- ...
triangleRasterCtx = TriangleCtx CullNone PolygonFill NoOffset LastVertex
colorFragmentCtx = accumulationContext (DepthOp Less True, ColorOp NoBlending (V4 True True True True))
rasterizeWith = rasterizePrimitives
triangles = triangleRasterCtx
cubeVertexStream = fetch "stream4" (Attribute "position4" :: Vec 4 Float, Attribute "vertexUV" :: Vec 2 Float)
mapFragments2 s fs = accumulate colorFragmentCtx ( \((a)) -> ((fs a))) s clear
mapFragments22 s fs = accumulate colorFragmentCtx ( \((a)) -> ((fs a))) s clear'
transform s f = mapPrimitives (\(v,u) -> (f v, u)) s
rotate' v = (Uniform "MVP" :: Mat 4 4 Float) `PrimMulMatVec` v
cube fb = cubeVertexStream -- cube vertices
`transform` (scale 0.5 . rotate') -- scale them
& rasterizeWith triangles ((Smooth)) -- rasterize
`mapFragments23` (\a -> a%xyxy)
where mapFragments23 s fs = accumulate colorFragmentCtx ( \((a)) -> ((fs a))) s fb
cube' fb = cubeVertexStream -- cube vertices
`transform` (scale 1.0 . rotate') -- scale them
& rasterizeWith triangles ((Smooth)) -- rasterize
`mapFragments2` (\a -> texture2D sampler a * V4 0.7 0.7 0.7 1)
where sampler = Sampler LinearFilter MirroredRepeat $ Texture2D (V2 1024 768) (PrjImageColor fb)
main = ScreenOut $ cube' $ cube' $ cube' $ cube' $ cube' $ cube clear
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