vulkan-tutorial/examples/example03.hs

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{-# LANGUAGE RecordWildCards #-}
import Affection
import qualified SDL
import qualified GEGL as G
import qualified BABL as B
import qualified Data.Map.Strict as M
import Foreign.C.Types
import System.Random (randomRIO)
import Debug.Trace
main :: IO ()
main = do
conf <- return $ AffectionConfig
{ initComponents = All
, windowTitle = "Affection: example00"
, windowConfig = SDL.defaultWindow
, preLoop = drawInit
, drawLoop = draw
, updateLoop = update
, loadState = load
, cleanUp = clean
}
withAffection conf
data UserData = UserData
{ nodeGraph :: M.Map String G.GeglNode
, foreground :: G.GeglBuffer
, coordinates :: Maybe (Int, Int)
, partsys :: ParticleSystem
}
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"
buffer <- G.gegl_buffer_new (G.GeglRectangle 0 0 800 600) =<<
B.babl_format (B.PixelFormat B.RGBA B.CFfloat)
bufsrc <- G.gegl_node_new_child root $ G.bufferSourceOperation
[ G.Property "buffer" $ G.PropertyBuffer buffer
]
traceM "buffer-source"
G.gegl_node_link checkerboard over
G.gegl_node_connect_to bufsrc "output" over "aux"
traceM "connections made"
myMap <- return $ M.fromList
[ ("root" , root)
, ("over" , over)
, ("background" , checkerboard)
, ("foreground" , bufsrc)
]
traceM "loading complete"
return $ UserData
{ nodeGraph = myMap
, foreground = buffer
, coordinates = Nothing
, partsys = ParticleSystem [] over buffer
}
drawInit :: Affection UserData ()
drawInit = do
UserData{..} <- getAffection
present (nodeGraph M.! "over") foreground (GeglRectangle 0 0 800 600) True
draw :: Affection UserData ()
draw = do
traceM "drawing"
-- ad <- get
-- ud <- getAffection
-- drawParticles partDraw $ particles ud
-- SDL.V2 (CInt rw) (CInt rh) <- SDL.surfaceDimensions $ drawSurface ad
-- let (w, h) = (fromIntegral rw, fromIntegral rh)
-- liftIO $ clearArea (foreground ud) (GeglRectangle 0 0 w h)
-- maybe (return ()) (\(x, y) ->
-- drawRect
-- (foreground ud)
-- (nodeGraph ud M.! "over")
-- (G.RGBA 1 0 0 0.5)
-- (Line 7)
-- (G.GeglRectangle (x - 10) (y - 10) 20 20)
-- ) $ coordinates ud
update :: Double -> AffectionState (AffectionData UserData) IO ()
update sec = do
traceM "updating"
ad <- get
ud <- getAffection
-- let newPart = updateParticles sec partUpd $ particles ud
-- putAffection $ ud { particles = newPart }
traceM $ (show $ 1 / sec) ++ " FPS"
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ev <- liftIO $ SDL.pollEvents
mapM_ (\e ->
case SDL.eventPayload e of
SDL.MouseMotionEvent dat ->
if SDL.ButtonLeft `elem` SDL.mouseMotionEventState dat
then do
let (SDL.P (SDL.V2 x y)) = SDL.mouseMotionEventPos dat
vx <- liftIO $ randomRIO (-20, 20)
vy <- liftIO $ randomRIO (-20, 20)
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life <- liftIO $ randomRIO (1, 5)
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-- traceM $ "position is: " ++ show x ++ " " ++ show y
-- traceM $ "velocity is: " ++ show vx ++ " " ++ show vy
putAffection $ ud
{ coordinates = Just (fromIntegral x, fromIntegral y)
, partsys = (partsys ud)
{ psParts = (Particle
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{ particleLife = life
, particlePosition = (fromIntegral x, fromIntegral y)
, particleRotation = 0
, particleVelocity = (vx, vy)
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, particlePitchRate = 0
}) : (psParts $ partsys ud)
}
}
else
return ()
SDL.WindowClosedEvent _ -> do
traceM "seeya!"
put $ ad
{ quitEvent = True
}
_ ->
return ()
) ev
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ud2 <- getAffection
nps <- updateParticleSystem (partsys ud2) sec partUpd partDraw
putAffection $ ud2 { partsys = nps }
clean :: UserData -> IO ()
clean _ = return ()
partUpd :: Double -> Particle -> Particle
partUpd sec p@Particle{..} =
p
{ particlePosition = (newX, newY)
, particleLife = particleLife - sec
}
where
newX = (fst particlePosition) + sec * (fromIntegral $ fst particleVelocity)
newY = (snd particlePosition) + sec * (fromIntegral $ snd particleVelocity)
partDraw :: G.GeglBuffer -> G.GeglNode -> Particle -> Affection UserData ()
partDraw buf node Particle{..} = do
ud <- getAffection
drawRect
buf
node
(G.RGBA 1 0 0 0.5)
(Line 5)
(G.GeglRectangle ((floor $ fst particlePosition) - 10) ((floor $ snd particlePosition) -10) 20 20)