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render modelViewProj = let
emptyFB = FrameBuffer (colorImage1 (V4 0.5 0.0 0.4 1.0))
rasterCtx = LineCtx 1.0 LastVertex
fragmentCtx = accumulationContext (ColorOp NoBlending (V4 True True True True))
vertexShader v = (PrimMulMatVec (modelViewProj :: Mat 4 4 Float) v, v)
vertexStream = fetch "stream4" Line (Attribute "position4" :: Vec 4 Float)
primitiveStream = mapPrimitives vertexShader vertexStream
fragmentStream = rasterizePrimitives rasterCtx Flat primitiveStream
fragmentShader = \v -> v
frame = accumulate fragmentCtx fragmentShader fragmentStream emptyFB
in ScreenOut frame
main = render (Uniform "MVP" :: Mat 4 4 Float)
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