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time = Uniform "Time" :: Float
deg45 = 0.78539816339
deg60 = 1.0471975512
deg360 = 6.28318530718
phase = fract (time *! 0.2)
smoothPhase = phase *! phase *! (3 -! 2 *! phase)
rotate' v = rotMatrixY (4.1 +! smoothPhase *! deg360) *. rotMatrixZ (deg45 *! 3) *. v
-- x = right, y = up
--leftSide :: Vec 2 Float -> Vec 4 Float
leftSide p = V4 0 1 blue (if p%y > 0.75 then 0 else 1)
where
blue = dot p (V2 0.5 (-0.5)) +! 0.4
-- x = up, y = left
--rightSide :: Vec 2 Float -> Vec 4 Float
rightSide p = V4 (p%x * p%x) 1 ((1 - p%x) * (1 - p%x)) (if p%y > 0.75 then 0 else 1)
-- x = left, y = down
--topSide :: Vec 2 Float -> Vec 4 Float
topSide p = V4 red 1 0 (if line > (-0.25) && line < 0 then 0 else 1)
where
red = dot p (V2 (-0.5) 0.5) +! 0.4
line = dot p (V2 1 (-1))
len2 v = v%x*v%x + v%y*v%y + v%z*v%z
makeFrame (vertexstream :: PrimitiveStream Triangle ((Vec 4 Float)))
= imageFrame (emptyDepthImage 1, emptyColorImage white)
`overlay`
vertexstream
& mapPrimitives (\((x)) -> (scale (0.2 +! abs (0.5 -! smoothPhase) *! 0.6) . rotate' $ x, x))
& rasterizePrimitives (TriangleCtx CullNone PolygonFill NoOffset LastVertex) ((Smooth))
& mapFragments (\((pos)) -> --logo :: Vec 4 Float -> Vec 4 Float
((
if abs pos%x > 0.99999 then rightSide (pos%yz *! sign pos%x *! 0.5 +! 0.5) else
if abs pos%y > 0.99999 then topSide (pos%zx *! sign pos%y *! 0.5 +! 0.5) else
if abs pos%z > 0.99999 then leftSide (pos%xy *! sign pos%z *! 0.5 +! 0.5) else black
)))
& accumulateWith (DepthOp Less True, ColorOp NoBlending (V4 True True True True))
main = renderFrame $
makeFrame (fetch "stream4" ((Attribute "position4")))
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