1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
module Graphics.Rendering.Rect.Backgrounds(Backgrounds(..), renderBackgrounds) where
import Graphics.Rendering.Rect.CSS.Backgrounds
import Graphics.Rendering.Rect.Types
import Graphics.Rendering.Rect.Image (Texture)
import qualified Data.ByteString.Char8 as B8
import Linear (M44)
import Control.Monad.IO.Class (MonadIO(..))
import Data.Maybe (fromMaybe, listToMaybe)
import Control.Monad (forM)
baseFragmentShader = B8.pack $ unlines [
"#version 330 core",
"out vec4 fcolour;",
"uniform vec4 colour;",
"void main() { fcolour = colour; }"
]
imageFragmentShader = B8.pack $ unlines [
"#version 330 core",
"in vec2 coord;",
"out vec4 fcolour;",
"uniform sampler2D image;",
"void main() { fcolour = texture(image, coord/textureSize(image, 0)); }"
]
renderBackgrounds :: (MonadIO m, MonadIO n) =>
n (Backgrounds Texture -> Rects -> M44 Float -> m ())
renderBackgrounds = do
base <- renderRectWith baseFragmentShader ["colour"]
layer <- renderRectWith imageFragmentShader []
return $ \self a b -> do
base [] [c $ background self] (headDef borderBox $ clip self) a b
let layers = image self `zip` (clip self ++ repeat borderBox)
forM layers $ \(img0, clip0) ->
layer [img0] [] clip0 a b
return ()
headDef def = fromMaybe def . listToMaybe