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{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
module Lazyfoo.Lesson14 (main) where
import Control.Monad
import Foreign.C.Types
import SDL.Vect
import SDL (($=))
import qualified SDL
import Paths_sdl2 (getDataFileName)
screenWidth, screenHeight :: CInt
(screenWidth, screenHeight) = (640, 480)
data Texture = Texture SDL.Texture (V2 CInt)
loadTexture :: SDL.Renderer -> FilePath -> IO Texture
loadTexture r filePath = do
surface <- getDataFileName filePath >>= SDL.loadBMP
size <- SDL.surfaceDimensions surface
let key = V4 0 maxBound maxBound maxBound
SDL.surfaceColorKey surface $= Just key
t <- SDL.createTextureFromSurface r surface
SDL.freeSurface surface
return (Texture t size)
renderTexture :: SDL.Renderer -> Texture -> Point V2 CInt -> Maybe (SDL.Rectangle CInt) -> IO ()
renderTexture r (Texture t size) xy clip =
let dstSize = maybe size (\(SDL.Rectangle _ size') -> size') clip
in SDL.copy r t clip (Just (SDL.Rectangle xy dstSize))
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
spriteSheetTexture <- loadTexture renderer "examples/lazyfoo/animation.bmp"
let spriteSize = V2 64 205
clip1 = SDL.Rectangle (P (V2 0 0)) spriteSize
clip2 = SDL.Rectangle (P (V2 64 0)) spriteSize
clip3 = SDL.Rectangle (P (V2 128 0)) spriteSize
clip4 = SDL.Rectangle (P (V2 196 0)) spriteSize
let loop [] = return ()
loop (frame:frames) = do
events <- SDL.pollEvents
let quit = elem SDL.QuitEvent $ map SDL.eventPayload events
SDL.rendererDrawColor renderer $= V4 maxBound maxBound maxBound maxBound
SDL.clear renderer
renderTexture renderer spriteSheetTexture (P (fmap (`div` 2) (V2 screenWidth screenHeight) - fmap (`div` 2) spriteSize)) (Just frame)
SDL.present renderer
unless quit (loop frames)
loop (cycle ([clip1, clip2, clip3, clip4] >>= replicate 4))
SDL.destroyRenderer renderer
SDL.destroyWindow window
SDL.quit
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