affection/examples/example00.hs

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{-# LANGUAGE RecordWildCards #-}
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import Affection
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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
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import Control.Monad (when)
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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
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main :: IO ()
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main = do
conf <- return $ AffectionConfig
{ initComponents = All
, windowTitle = "Affection: example00"
, windowConfig = SDL.defaultWindow
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, preLoop = return ()
, eventLoop = handle
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, updateLoop = update
, drawLoop = draw
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, loadState = load
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, cleanUp = clean
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}
withAffection conf
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data UserData = UserData
{ nodeGraph :: M.Map String G.GeglNode
}
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load :: SDL.Surface -> IO UserData
load _ = do
traceM "loading"
root <- G.gegl_node_new
traceM "new root node"
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checkerboard <- G.gegl_node_new_child root $ G.checkerboardOperation $
props $ do
prop "color1" $ G.RGBA 0.4 0.4 0.4 1
prop "color2" $ G.RGBA 0.6 0.6 0.6 1
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traceM "checkerboard"
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over <- G.gegl_node_new_child root G.defaultOverOperation
traceM "over"
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text <- G.gegl_node_new_child root $ G.textOperation $
props $ do
prop "string" ("Hello world!"::String)
prop "color" $ G.RGBA 0 0 1 0.5
prop "size" (40::Int)
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traceM "text"
G.gegl_node_link checkerboard over
G.gegl_node_connect_to text "output" over "aux"
traceM "connections made"
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myMap <- return $ M.fromList
[ ("root" , root)
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, ("over" , over)
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, ("checkerboard", checkerboard)
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, ("text" , text)
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]
traceM "loading complete"
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return $ UserData
{ nodeGraph = myMap
}
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draw :: Affection UserData ()
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draw = do
traceM "drawing"
AffectionData{..} <- get
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let UserData{..} = userState
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liftIO $ SDL.lockSurface drawSurface
pixels <- liftIO $ SDL.surfacePixels drawSurface
let SDL.Surface rawSurfacePtr _ = drawSurface
rawSurface <- liftIO $ peek rawSurfacePtr
pixelFormat <- liftIO $ peek $ Raw.surfaceFormat rawSurface
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format <- liftIO $ (B.babl_format $ B.PixelFormat B.RGBA B.CFu8)
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SDL.V2 (CInt rw) (CInt rh) <- SDL.surfaceDimensions drawSurface
let (w, h) = (fromIntegral rw, fromIntegral rh)
liftIO $ G.gegl_node_blit
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(nodeGraph M.! "over" :: G.GeglNode)
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1
(G.GeglRectangle 0 0 w h)
format
pixels
(fromIntegral (Raw.pixelFormatBytesPerPixel pixelFormat) * w)
[G.GeglBlitDefault]
liftIO $ SDL.unlockSurface drawSurface
liftIO $ SDL.updateWindowSurface drawWindow
handle :: SDL.EventPayload -> Affection UserData ()
handle = const $ return ()
update :: Affection UserData ()
update = do
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traceM "updating"
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ad <- get
ud@UserData{..} <- getAffection
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sec <- getDelta
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traceM $ (show $ 1 / sec) ++ " FPS"
when (elapsedTime ad > 5) $
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put $ ad
{ quitEvent = True
}
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clean :: UserData -> IO ()
clean _ = return ()