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{-# LANGUAGE CPP #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
module Lazyfoo.Lesson43 (main) where
import Prelude hiding (any, mapM_)
import Control.Monad hiding (mapM_)
import Data.Foldable hiding (elem)
import Data.Maybe
import Foreign.C.Types
import SDL.Vect
import SDL (($=))
import qualified SDL
#if !MIN_VERSION_base(4,8,0)
import Control.Applicative
#endif
screenWidth, screenHeight :: CInt
(screenWidth, screenHeight) = (640, 480)
data Texture = Texture SDL.Texture (V2 CInt)
createBlank :: SDL.Renderer -> V2 CInt -> SDL.TextureAccess -> IO Texture
createBlank r sz access = Texture <$> SDL.createTexture r SDL.RGBA8888 access sz <*> pure sz
renderTexture :: SDL.Renderer -> Texture -> Point V2 CInt -> Maybe (SDL.Rectangle CInt) -> Maybe CDouble -> Maybe (Point V2 CInt) -> Maybe (V2 Bool) -> IO ()
renderTexture r (Texture t size) xy clip theta center flips =
let dstSize =
maybe size (\(SDL.Rectangle _ size') -> size') clip
in SDL.copyEx r
t
clip
(Just (SDL.Rectangle xy dstSize))
(fromMaybe 0 theta)
center
(fromMaybe (pure False) flips)
setAsRenderTarget :: SDL.Renderer -> Maybe Texture -> IO ()
setAsRenderTarget r Nothing = SDL.rendererRenderTarget r $= Nothing
setAsRenderTarget r (Just (Texture t _)) = SDL.rendererRenderTarget r $= Just t
main :: IO ()
main = do
SDL.initialize [SDL.InitVideo]
SDL.HintRenderScaleQuality $= SDL.ScaleLinear
do renderQuality <- SDL.get SDL.HintRenderScaleQuality
when (renderQuality /= SDL.ScaleLinear) $
putStrLn "Warning: Linear texture filtering not enabled!"
window <-
SDL.createWindow
"SDL Tutorial"
SDL.defaultWindow {SDL.windowInitialSize = V2 screenWidth screenHeight}
SDL.showWindow window
renderer <-
SDL.createRenderer
window
(-1)
SDL.RendererConfig
{ SDL.rendererType = SDL.AcceleratedVSyncRenderer
, SDL.rendererTargetTexture = False
}
SDL.rendererDrawColor renderer $= V4 maxBound maxBound maxBound maxBound
targetTexture <- createBlank renderer (V2 screenWidth screenHeight) SDL.TextureAccessTarget
let
screenCenter = P (V2 (screenWidth `div` 2) (screenHeight `div` 2))
loop theta = do
events <- map SDL.eventPayload <$> SDL.pollEvents
let quit = SDL.QuitEvent `elem` events
setAsRenderTarget renderer (Just targetTexture)
SDL.rendererDrawColor renderer $= V4 maxBound maxBound maxBound maxBound
SDL.clear renderer
SDL.rendererDrawColor renderer $= V4 maxBound 0 0 maxBound
SDL.fillRect renderer (Just $ SDL.Rectangle (P $ V2 (screenWidth `div` 4) (screenHeight `div` 4))
(V2 (screenWidth `div` 2) (screenHeight `div` 2)))
SDL.rendererDrawColor renderer $= V4 0 0 maxBound maxBound
SDL.drawRect renderer (Just (SDL.Rectangle (P $ V2 (screenWidth `div` 6) (screenHeight `div` 6))
(V2 (screenWidth * 2 `div` 3) (screenHeight * 2 `div` 3))))
SDL.rendererDrawColor renderer $= V4 0 maxBound 0 maxBound
SDL.drawLine renderer (P (V2 0 (screenHeight `div` 2))) (P (V2 screenWidth (screenHeight `div` 2)))
SDL.rendererDrawColor renderer $= V4 maxBound maxBound maxBound maxBound
for_ [0, 4 .. screenHeight] $ \i ->
SDL.drawPoint renderer (P (V2 (screenWidth `div` 2) i))
setAsRenderTarget renderer Nothing
renderTexture renderer targetTexture 0 Nothing (Just (fromIntegral theta)) (Just screenCenter) Nothing
SDL.present renderer
unless quit (loop (theta + 2 `mod` 360))
loop (0 :: Int)
SDL.destroyWindow window
SDL.quit
|
