SDL2

• Hackage: https://hackage.haskell.org/package/sdl2
• Source: https://github.com/haskell-game/sdl2

The package itself provides a nice introduction.

SDL (Simple DirectMedia Layer) is a library for cross-platform development of interactive applications. SDL provides routines for managing windows, rendering graphics, processing sound, collecting input data, and much more. The Haskell sdl2 library provides both a high- and low-level API to interface with SDL.

https://hackage.haskell.org/package/sdl2/docs/SDL.html

For an extended hands-on tutorial there is a Haskell port of LazyFoo’s SDL lessons.

https://github.com/palf/haskell-sdl2-examples

Minimal example

module Main where

import SDL
import Linear (V4(..))
import Control.Monad (unless)

main :: IO ()
main = do
  initializeAll
  window <- createWindow "My SDL Application" defaultWindow
  renderer <- createRenderer window (-1) defaultRenderer
  appLoop renderer
  destroyWindow window

appLoop :: Renderer -> IO ()
appLoop renderer = do
  events <- pollEvents
  let eventIsQPress event =
        case eventPayload event of
          KeyboardEvent keyboardEvent ->
            keyboardEventKeyMotion keyboardEvent == Pressed &&
            keysymKeycode (keyboardEventKeysym keyboardEvent) == KeycodeQ
          _ -> False
      qPressed = any eventIsQPress events
  rendererDrawColor renderer $= V4 0 0 255 255
  clear renderer
  present renderer
  unless qPressed (appLoop renderer)

Extras

• sdl2-gfx: Graphics primitives and surface functions.
• sdl2-image: Load images of various formats as SDL surfaces.
• sdl2-mixer: Multi-channel audio mixer.
• sdl2-ttf: FreeType wrapper to render text.