affection/src/Affection.hs

{-# LANGUAGE RecordWildCards #-}
module Affection
    ( withAffection
    , withWindow
    , withDefaultWindow
    , delaySec
    , module Affection.Render
    , module Types
    ) where

import qualified SDL
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.Monad.Reader
import Control.Concurrent.MVar

import Affection.Render
import Affection.Types as Types

withAffection :: AffectionConfig us -> IO ()
withAffection conf@AffectionConfig{..} = do
  case initComponents of
    All ->
      SDL.initializeAll
    Only is ->
      SDL.initialize is
  execTime <- newMVar =<< getTime Monotonic
  window <- SDL.createWindow windowTitle windowConfig
  surface <- SDL.getWindowSurface window
  initContainer <- return $ AffectionData
    { affectionConfig = conf
    , quitEvent       = False
    , userState       = userData
    , drawWindow      = window
    , drawSurface     = surface
    }
  state <- newMVar initContainer
  (res, nState) <- runStateT ( Types.runState $
    whileM_ (do
        current <- get
        return $ Types.quitEvent current
      )
      $ do
        now      <- liftIO $ getTime Monotonic
        lastTime <- liftIO $ fromMaybe now <$> tryReadMVar execTime
        drawLoop
        updateLoop $ (fromIntegral $ toNanoSecs $ diffTimeSpec lastTime now) /
          (fromIntegral 10 ^ 9)
        liftIO $ putMVar execTime $ now
    ) initContainer
  SDL.quit

withWindow :: Monad m => T.Text -> WindowConfig -> SDL.RendererConfig -> RenderT m a -> IO ()
withWindow title wconf rconf ops = do
  window <- SDL.createWindow title wconf
  -- I don't need a renderer here, i need a surface
  renderer <- SDL.createRenderer window (-1) rconf
  surface <- SDL.getWindowSurface window
  G.gegl_init
  -- I think I need some AffectionT or someting similar here and not a RenderT
  -- from SDL.
  inRender renderer $ ops
  G.gegl_exit
  SDL.destroyWindow window

withDefaultWindow :: Monad m => T.Text -> (RenderT m a) -> IO ()
withDefaultWindow title ops = withWindow title defaultWindow SDL.defaultRenderer ops

delaySec :: Int -> IO ()
delaySec dur = SDL.delay (fromIntegral $ dur * 1000)