blob: 838857bfeadf9441cec5d8efc909077d215e7917 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
time = Uniform "Time" :: Float
clear = FrameBuffer $ ColorImage @1 $ V4 1 0 0 0.5
triangleRasterCtx = TriangleCtx CullNone PolygonFill NoOffset LastVertex
colorFragmentCtx = accumulationContext ((ColorOp NoBlending (V4 True True True True)))
rasterizeWith = Rasterize
triangles = triangleRasterCtx
quadVertexStream = fetch "quad" Triangle (Attribute "position" :: ((Vec 4 Float)))
transform s f = Transform (\v -> VertexOut (f v) 1 () (Smooth v)) s
mapFragments s fs = accumulate colorFragmentCtx PassAll (FragmentShader $ \((a)) -> ((fs a))) s clear
render f = quadVertexStream -- id vertices
`transform` id
& rasterizeWith triangles -- rasterize
`mapFragments` f
& ScreenOut -- draw into screen
fun x = if x < 0 then 0 else x +! fun (x -! 0.3)
main' = render $ \c -> if fun time < 0.5 then c else blue
|
