pituicat/src/Affection.hs
2017-02-17 17:15:06 +01:00

170 lines
5 KiB
Haskell

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