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{-# LANGUAGE CPP #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE MultiWayIf #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE PatternSynonyms #-}
module Lazyfoo.Lesson15 (main) where
import Control.Monad
import Data.Monoid
import Data.Maybe
import Foreign.C.Types
import SDL.Vect
import SDL (($=))
import qualified SDL
import Paths_sdl2 (getDataFileName)
#if !MIN_VERSION_base(4,8,0)
import Control.Applicative
import Data.Foldable
#endif
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) -> 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)
textureSize :: Texture -> V2 CInt
textureSize (Texture _ sz) = sz
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
arrowTexture <- loadTexture renderer "examples/lazyfoo/arrow.bmp"
let loop theta flips = do
events <- SDL.pollEvents
let (Any quit, Sum phi, Last newFlips) =
foldMap (\case
SDL.QuitEvent -> (Any True, mempty, mempty)
SDL.KeyboardEvent e ->
(\(x,y) -> (mempty, x,y)) $
if | SDL.keyboardEventKeyMotion e == SDL.Pressed ->
case SDL.keysymScancode (SDL.keyboardEventKeysym e) of
SDL.ScancodeQ -> (mempty, Last (Just (V2 True False)))
SDL.ScancodeW -> (mempty, Last (Just (V2 False False)))
SDL.ScancodeE -> (mempty, Last (Just (V2 False True)))
SDL.ScancodeA -> (Sum (-60), mempty)
SDL.ScancodeD -> (Sum 60, mempty)
_ -> mempty
| otherwise -> mempty
_ -> mempty) $
map SDL.eventPayload events
SDL.rendererDrawColor renderer $= V4 maxBound maxBound maxBound maxBound
SDL.clear renderer
let theta' = theta + phi
flips' = fromMaybe flips newFlips
renderTexture renderer arrowTexture (P (fmap (`div` 2) (V2 screenWidth screenHeight) - fmap (`div` 2) (textureSize arrowTexture))) Nothing (Just theta') Nothing (Just flips')
SDL.present renderer
unless quit (loop theta' flips')
loop 0 (pure False)
SDL.destroyRenderer renderer
SDL.destroyWindow window
SDL.quit
|
