affection/examples/example01.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
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 = const $ return ()
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, updateLoop = update
, drawLoop = draw
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, loadState = load
, cleanUp = clean
}
withAffection conf
data UserData = UserData
{ nodeGraph :: M.Map String G.GeglNode
, foreground :: G.GeglBuffer
, lastTick :: Double
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}
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"
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buffer <- G.gegl_buffer_new (Just $ G.GeglRectangle 0 0 800 600) =<<
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B.babl_format (B.PixelFormat B.RGBA B.CFfloat)
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sink <- G.gegl_node_new_child root $ G.Operation "gegl:copy-buffer"
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[ G.Property "buffer" $ G.PropertyBuffer buffer
]
traceM "buffer-source"
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nop <- G.gegl_node_new_child root $ G.Operation "gegl:nop" []
traceM "nop"
crop <- G.gegl_node_new_child root $ G.Operation "gegl:crop"
[ G.Property "width" $ G.PropertyDouble 800
, G.Property "height" $ G.PropertyDouble 600
]
G.gegl_node_link_many [checkerboard, over, crop, sink]
G.gegl_node_connect_to nop "output" over "aux"
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traceM "connections made"
myMap <- return $ M.fromList
[ ("root" , root)
, ("over" , over)
, ("background" , checkerboard)
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, ("sink" , sink)
, ("nop" , nop)
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]
let roi = G.GeglRectangle 0 0 20 20
traceM "loading complete"
return $ UserData
{ nodeGraph = myMap
, foreground = buffer
, lastTick = 0
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}
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draw :: Affection UserData ()
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draw = do
traceM "drawing"
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UserData{..} <- getAffection
drawRect (nodeGraph M.! "nop") (G.RGB 1 0 0) Fill (G.GeglRectangle 10 10 500 500) foreground
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liftIO $ G.gegl_node_process $ nodeGraph M.! "sink"
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update :: Affection UserData ()
update = do
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traceM "updating"
ud <- getAffection
let last = lastTick ud
tick <- getTick
putAffection $ ud { lastTick = tick }
let dt = tick - last
traceM $ (show $ 1 / dt) ++ " FPS"
when (tick > 20) $
quit
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clean :: UserData -> IO ()
clean _ = return ()