vulkan-tutorial/examples/example00.hs

{-# LANGUAGE RecordWildCards #-}

import Affection
import qualified SDL
import qualified SDL.Raw as Raw
import qualified GEGL as G
import qualified BABL as B
import qualified Data.Map.Strict as M

import Control.Monad (when)

import Foreign.Storable (peek)
import Foreign.C.Types  (CInt(..))

import Debug.Trace

-- main :: IO ()
-- main = withAllAffection $
--   withDefaultWindow "test" $ do
--     changeColor $ RGBA 255 255 255 255
--     clear
--     present
--     liftIO $ delaySec 2

main :: IO ()
main = do
  conf <- return $ AffectionConfig
    { initComponents = All
    , windowTitle    = "Affection: example00"
    , windowConfig   = SDL.defaultWindow
    , preLoop        = return ()
    , drawLoop       = draw
    , updateLoop     = update
    , loadState      = load
    , cleanUp        = clean
    }
  withAffection conf

data UserData = UserData
  { nodeGraph   :: M.Map String G.GeglNode
  }

load :: SDL.Surface -> IO UserData
load _ = do
  traceM "loading"
  root <- G.gegl_node_new
  traceM "new root node"
  checkerboard <- G.gegl_node_new_child root $ G.checkerboardOperation
    [ G.Property "color1" $ G.PropertyColor $ G.RGBA 0.4 0.4 0.4 1
    , G.Property "color2" $ G.PropertyColor $ G.RGBA 0.6 0.6 0.6 1
    ]
  traceM "checkerboard"
  over <- G.gegl_node_new_child root G.defaultOverOperation
  traceM "over"
  text <- G.gegl_node_new_child root $ G.textOperation
    [ G.Property "string" $ G.PropertyString "Hello world!"
    , G.Property "color"  $ G.PropertyColor $ G.RGBA 0 0 1 0.5
    , G.Property "size"   $ G.PropertyDouble 40
    ]
  traceM "text"
  G.gegl_node_link checkerboard over
  G.gegl_node_connect_to text "output" over "aux"
  traceM "connections made"
  myMap <- return $ M.fromList
    [ ("root"        , root)
    , ("over"        , over)
    , ("checkerboard", checkerboard)
    , ("text"        , text)
    ]
  traceM "loading complete"
  return $ UserData
    { nodeGraph = myMap
    }

draw :: Affection UserData ()
draw = do
  traceM "drawing"
  AffectionData{..} <- get
  let UserData{..} = userState
  liftIO $ SDL.lockSurface drawSurface
  pixels <- liftIO $ SDL.surfacePixels drawSurface
  let SDL.Surface rawSurfacePtr _ = drawSurface
  rawSurface <- liftIO $ peek rawSurfacePtr
  pixelFormat <- liftIO $ peek $ Raw.surfaceFormat rawSurface
  format <- liftIO $ (B.babl_format $ B.PixelFormat B.RGBA B.CFu8)
  SDL.V2 (CInt rw) (CInt rh) <- SDL.surfaceDimensions drawSurface
  let (w, h) = (fromIntegral rw, fromIntegral rh)
  liftIO $ G.gegl_node_blit
    (nodeGraph M.! "over" :: G.GeglNode)
    1
    (G.GeglRectangle 0 0 w h)
    format
    pixels
    (fromIntegral (Raw.pixelFormatBytesPerPixel pixelFormat) * w)
    [G.GeglBlitDefault]
  liftIO $ SDL.unlockSurface drawSurface
  liftIO $ SDL.updateWindowSurface drawWindow

update :: Double -> [SDL.Event] -> Affection UserData ()
update sec _ = do
  traceM "updating"
  ad <- get
  ud@UserData{..} <- getAffection
  traceM $ (show $ 1 / sec) ++ " FPS"
  when (elapsedTime ad > 5) $
    put $ ad
      { quitEvent = True
      }

clean :: UserData -> IO ()
clean _ = return ()