Removed unnecessary IORef

1 files changed, 38 insertions, 44 deletions

diff --git a/src/Game.hs b/src/Game.hs
index d8ce8b6..2d8c23a 100644
--- a/src/Game.hs
+++ b/src/Game.hs
@@ -40,8 +40,8 @@ data Env = Env
   { window :: SDL.Window,
     renderer :: SDL.Renderer,
     canvas :: SDL.Texture,
-    fullscreen :: IORef Bool,
-    renderRect :: IORef (SDL.Rectangle CInt),
+    fullscreen :: Bool,
+    renderRect :: SDL.Rectangle CInt,
     controls :: IORef C.Controls,
     map :: M.Map,
     sprites :: S.SpriteSheet,
@@ -71,8 +71,6 @@ main = do
         }
   SDL.HintRenderScaleQuality $= SDL.ScaleNearest
   canvas <- SDL.createTexture renderer SDL.RGBA8888 SDL.TextureAccessTarget (V2 gameWidth gameHeight)
-  fullscreen <- newIORef False
-  renderRect <- newIORef defaultRenderRect
   tsTexture <- SDL.Image.loadTexture renderer "data/tiles.png"
   ssTexture <- SDL.Image.loadTexture renderer "data/sprites.png"
   bfTexture <- SDL.Image.loadTexture renderer "data/font.png"
@@ -97,8 +95,8 @@ main = do
       { window = window,
         renderer = renderer,
         canvas = canvas,
-        fullscreen = fullscreen,
-        renderRect = renderRect,
+        fullscreen = False,
+        renderRect = defaultRenderRect,
         controls = controls,
         map = map',
         sprites = sprites,
@@ -110,43 +108,40 @@ main = do
   SDL.destroyWindow window
   SDL.quit
 
-toggleFullscreen :: Env -> IO ()
-toggleFullscreen env = do
-  let fullscreen = env.fullscreen
-      renderRect = env.renderRect
-      renderer = env.renderer
-      window = env.window
-  fullscreen $~ not
-  fs <- SDL.get fullscreen
-  let mode = if fs then SDL.FullscreenDesktop else SDL.Windowed
-   in SDL.setWindowMode window mode
-
-  vp <- if fs then SDL.get $ SDL.rendererViewport renderer else pure Nothing
-  let newRenderRect = case vp of
-        Nothing -> defaultRenderRect
-        Just (SDL.Rectangle _ (V2 w h)) ->
-          SDL.Rectangle (SDL.P $ V2 rx ry) (V2 rw rh)
-          where
-            scale = min (w `div` gameWidth) (h `div` gameHeight)
-            rx = (w - (gameWidth * scale)) `div` 2
-            ry = (h - (gameHeight * scale)) `div` 2
-            rw = gameWidth * scale
-            rh = gameHeight * scale
-   in renderRect $= newRenderRect
+toggleFullscreen :: Env -> IO Env
+toggleFullscreen env =
+  do
+    let fullscreen = not env.fullscreen
+        renderer = env.renderer
+        window = env.window
+    let mode = if fullscreen then SDL.FullscreenDesktop else SDL.Windowed
+     in SDL.setWindowMode window mode
+
+    vp <- if fullscreen then SDL.get $ SDL.rendererViewport renderer else pure Nothing
+    let renderRect = case vp of
+          Nothing -> defaultRenderRect
+          Just (SDL.Rectangle _ (V2 w h)) -> SDL.Rectangle (SDL.P $ V2 rx ry) (V2 rw rh)
+            where
+              scale = min (w `div` gameWidth) (h `div` gameHeight)
+              rx = (w - (gameWidth * scale)) `div` 2
+              ry = (h - (gameHeight * scale)) `div` 2
+              rw = gameWidth * scale
+              rh = gameHeight * scale
+    pure env {fullscreen = fullscreen, renderRect = renderRect}
 
 gameLoop :: Env -> IO ()
-gameLoop env = do
+gameLoop e = do
+  events <- map SDL.eventPayload <$> SDL.pollEvents
+
+  -- F11 for fullscreen / windowed
+  env <- if fromMaybe False $ U.isPressed SDL.KeycodeF11 events then toggleFullscreen e else pure e
+
   let renderer = env.renderer
       canvas = env.canvas
       renderRect = env.renderRect
       controls = env.controls
       stateRef = env.state
 
-  events <- map SDL.eventPayload <$> SDL.pollEvents
-
-  -- F11 for fullscreen / windowed
-  when (fromMaybe False $ U.isPressed SDL.KeycodeF11 events) $ toggleFullscreen env
-
   -- ESC or close the window to quit
   let quit = fromMaybe False (U.isPressed SDL.KeycodeEscape events) || SDL.QuitEvent `elem` events
   unless quit $ do
@@ -163,8 +158,7 @@ gameLoop env = do
 
     SDL.rendererRenderTarget renderer $= Nothing
     SDL.clear renderer
-    rect <- SDL.get renderRect
-    SDL.copy renderer canvas Nothing (Just rect)
+    SDL.copy renderer canvas Nothing (Just renderRect)
 
     SDL.present renderer
 
@@ -172,10 +166,10 @@ gameLoop env = do
   where
     playLoop :: IO ()
     playLoop = do
-      let renderer = env.renderer
-          map' = env.map
-          entities = env.entities
-          hud = env.hud
+      let renderer = e.renderer
+          map' = e.map
+          entities = e.entities
+          hud = e.hud
 
       updated <- E.updateAll =<< readIORef entities
       entities $= updated
@@ -196,9 +190,9 @@ gameLoop env = do
 
     gameOverLoop :: IO ()
     gameOverLoop = do
-      let renderer = env.renderer
-          sprites = env.sprites
-          hud = env.hud
+      let renderer = e.renderer
+          sprites = e.sprites
+          hud = e.hud
 
       H.render renderer hud
       title <- S.get sprites "game-over"