affection/examples/example00.hs
nek0 678c830e33 example now working with the right colours
This was an issue with the default surface created by sdl, which had
the wrong color format. For the future it is advised to use the RGBA
CFu8 format from babl, or things may break again.
2016-11-08 04:31:51 +01:00

115 lines
3.1 KiB
Haskell

{-# LANGUAGE RecordWildCards #-}
import Affection
import qualified SDL
import qualified SDL.Raw as Raw
import qualified GEGL as G
import qualified BABL as B
import qualified Data.Map.Strict as M
import Foreign.Storable (peek)
import Foreign.C.Types (CInt(..))
import Debug.Trace
-- main :: IO ()
-- main = withAllAffection $
-- withDefaultWindow "test" $ do
-- changeColor $ RGBA 255 255 255 255
-- clear
-- present
-- liftIO $ delaySec 2
main :: IO ()
main = do
conf <- return $ AffectionConfig
{ initComponents = All
, windowTitle = "Affection: example00"
, windowConfig = SDL.defaultWindow
, drawLoop = draw
, updateLoop = update
, loadState = load
}
withAffection conf
data UserData = UserData
{ nodeGraph :: M.Map String G.GeglNode
, elapsedTime :: Double
}
load :: SDL.Surface -> IO UserData
load _ = do
traceM "loading"
root <- G.gegl_node_new
traceM "new root node"
checkerboard <- G.gegl_node_new_child root $ G.checkerboardOperation
[ G.Property "color1" $ G.PropertyColor $ G.RGBA 0.4 0.4 0.4 1
, G.Property "color2" $ G.PropertyColor $ G.RGBA 0.6 0.6 0.6 1
]
traceM "checkerboard"
over <- G.gegl_node_new_child root G.defaultOverOperation
traceM "over"
text <- G.gegl_node_new_child root $ G.textOperation
[ G.Property "string" $ G.PropertyString "Hello world!"
, G.Property "color" $ G.PropertyColor $ G.RGBA 0 0 1 0.1
, G.Property "size" $ G.PropertyDouble 40
]
traceM "text"
G.gegl_node_link checkerboard over
G.gegl_node_connect_to text "output" over "aux"
traceM "connections made"
myMap <- return $ M.fromList
[ ("root" , root)
, ("over" , over)
, ("checkerboard", checkerboard)
, ("text" , text)
]
traceM "loading complete"
return $ UserData
{ nodeGraph = myMap
, elapsedTime = 0
}
draw :: AffectionState (AffectionData UserData) IO ()
draw = do
traceM "drawing"
AffectionData{..} <- get
let UserData{..} = userState
liftIO $ SDL.lockSurface drawSurface
pixels <- liftIO $ SDL.surfacePixels drawSurface
let SDL.Surface rawSurfacePtr _ = drawSurface
rawSurface <- liftIO $ peek rawSurfacePtr
pixelFormat <- liftIO $ peek $ Raw.surfaceFormat rawSurface
format <- liftIO $ (B.babl_format $ B.PixelFormat B.RGBA B.CFu8)
SDL.V2 (CInt rw) (CInt rh) <- SDL.surfaceDimensions drawSurface
let (w, h) = (fromIntegral rw, fromIntegral rh)
liftIO $ G.gegl_node_blit
(nodeGraph M.! "over" :: G.GeglNode)
1
(G.GeglRectangle 0 0 w h)
format
pixels
(fromIntegral (Raw.pixelFormatBytesPerPixel pixelFormat) * w)
[G.GeglBlitDefault]
liftIO $ SDL.unlockSurface drawSurface
liftIO $ SDL.updateWindowSurface drawWindow
update :: Double -> AffectionState (AffectionData UserData) IO ()
update sec = do
traceM "updating"
-- liftIO $ delaySec 5
ad@AffectionData{..} <- get
let ud@UserData{..} = userState
traceM $ show elapsedTime
if elapsedTime < 5
then
put $ ad
{ userState = ud
{ elapsedTime = elapsedTime + sec
}
}
else
put $ ad
{ quitEvent = True
}