affection/src/Affection.hs

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{-# LANGUAGE RecordWildCards #-}
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module Affection
( withAffection
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, getAffection
, putAffection
-- , withWindow
-- , withDefaultWindow
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, delaySec
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, get
, put
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, module A
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) where
import qualified SDL
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import qualified SDL.Internal.Numbered as SDL (toNumber)
import qualified SDL.Raw as Raw
import qualified GEGL as G
import qualified Data.Text as T
import Data.Maybe
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import System.Clock
import Control.Monad.Loops
import Control.Monad.State
import Control.Concurrent.MVar
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import Foreign.C.Types (CInt(..))
import Foreign.Storable (peek)
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import Debug.Trace
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import Affection.Types as A
import Affection.Draw as A
import Affection.Particle as A
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import qualified BABL as B
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-- | Main function which bootstraps everything else.
withAffection
:: AffectionConfig us -- ^ Configuration of the Game and its engine.
-> IO ()
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withAffection AffectionConfig{..} = do
case initComponents of
All ->
SDL.initializeAll
Only is ->
SDL.initialize is
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G.gegl_init
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execTime <- newMVar =<< getTime Monotonic
window <- SDL.createWindow windowTitle windowConfig
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-- let surface = (flip SDL.Surface Nothing) rawSurfacePtr
(oldSurf, surface) <- getSurfaces window
let bablFormat = B.PixelFormat B.RGBA B.CFu8
format <- B.babl_format bablFormat
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initContainer <- (\x -> AffectionData
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{ quitEvent = False
, userState = x
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, drawWindow = window
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, windowSurface = oldSurf
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, drawSurface = surface
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, drawFormat = format
, drawStack = []
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, elapsedTime = 0
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}) <$> loadState surface
(_, nState) <- runStateT ( A.runState $ do
preLoop
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liftIO $ SDL.surfaceBlit surface Nothing oldSurf Nothing
whileM_ (do
current <- get
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return $ not $ A.quitEvent current
)
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(do
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-- Measure time difference form last run
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now <- liftIO $ getTime Monotonic
lastTime <- liftIO $ fromMaybe now <$> tryReadMVar execTime
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-- get state
ad <- get
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-- clean draw requests from last run
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pixels <- SDL.surfacePixels $ drawSurface ad
(SDL.Surface ptr _) <- SDL.getWindowSurface window
rawSurfacePtr <- Raw.convertSurfaceFormat ptr (SDL.toNumber SDL.ABGR8888) 0
pixelFormat <- liftIO $ peek . Raw.surfaceFormat =<< peek rawSurfacePtr
SDL.V2 (CInt rw) (CInt rh) <- liftIO $ SDL.surfaceDimensions surface
let (w, h) = (fromIntegral rw, fromIntegral rh)
stride = fromIntegral (Raw.pixelFormatBytesPerPixel pixelFormat) * w
cpp = B.babl_components_per_pixel bablFormat
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mapM_ (invalidateDrawRequest pixels stride cpp) $ drawStack ad
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-- compute dt and update elapsedTime
let dt = (fromIntegral $ toNanoSecs $ diffTimeSpec lastTime now) / (fromIntegral 10 ^ 9)
put $ ad
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{ drawStack = []
, elapsedTime = elapsedTime ad + dt
}
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-- poll events
evs <- preHandleEvents =<< liftIO SDL.pollEvents
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-- execute user defined update loop
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updateLoop dt evs
-- execute user defined draw loop
drawLoop
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-- handle all new draw requests
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ad2 <- get
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clear <- catMaybes <$> mapM (handleDrawRequest pixels stride cpp) (drawStack ad2)
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-- save all draw requests to clear in next run
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put $ ad2
{ drawStack = clear }
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-- blit surface and update window
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liftIO $ SDL.surfaceBlit
(drawSurface ad2)
Nothing
(windowSurface ad2)
Nothing
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liftIO $ SDL.updateWindowSurface $ drawWindow ad2
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-- save new time
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_ <- liftIO $ swapMVar execTime $ now
return ()
)
) initContainer
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G.gegl_exit
cleanUp $ userState nState
SDL.quit
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getSurfaces :: SDL.Window -> IO (SDL.Surface, SDL.Surface)
getSurfaces window = do
oldSurf@(SDL.Surface ptr _) <- SDL.getWindowSurface window
rawSurfacePtr <- Raw.convertSurfaceFormat ptr (SDL.toNumber SDL.ABGR8888) 0
let surface = (flip SDL.Surface Nothing) rawSurfacePtr
return (oldSurf, surface)
preHandleEvents :: [SDL.Event] -> Affection us [SDL.Event]
preHandleEvents evs =
catMaybes <$> mapM handle evs
where
handle e =
case SDL.eventPayload e of
SDL.WindowMovedEvent _ -> do
liftIO $ traceIO "I was moved"
putNewSurface
return Nothing
_ ->
return $ Just e
putNewSurface = do
ad <- get
(oldSurf, surface) <- liftIO $ getSurfaces $ drawWindow ad
put ad
{ windowSurface = oldSurf
, drawSurface = surface
}
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-- | Return the userstate to the user
getAffection :: Affection us us
getAffection = do
ad <- get
return $ userState ad
-- | Put altered user state back
putAffection
:: us -- User state
-> Affection us ()
putAffection us = do
ad <- get
put $ ad
{ userState = us }
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-- | block a thread for a specified amount of time
delaySec
:: Int -- ^ Number of seconds
-> IO ()
delaySec dur = SDL.delay (fromIntegral $ dur * 1000)