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{-# LANGUAGE OverloadedStrings #-}
module Lazyfoo.Lesson08 (main) where
import Control.Monad
import Data.Foldable (for_)
import Foreign.C.Types
import SDL.Vect
import SDL (($=))
import qualified SDL
screenWidth, screenHeight :: CInt
(screenWidth, screenHeight) = (640, 480)
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.AcceleratedRenderer
, SDL.rendererTargetTexture = False
}
SDL.rendererDrawColor renderer $= V4 maxBound maxBound maxBound maxBound
let loop = do
events <- SDL.pollEvents
let quit = elem SDL.QuitEvent $ map SDL.eventPayload events
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))
SDL.present renderer
unless quit loop
loop
SDL.destroyRenderer renderer
SDL.destroyWindow window
SDL.quit
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