affection/examples/example04.hs

{-# LANGUAGE RecordWildCards #-}

import Affection
import qualified SDL
import qualified GEGL as G
import qualified BABL as B
import qualified Data.Map.Strict as M
import Data.List as L
import Data.Maybe (fromJust)
import Control.Monad (when)
import qualified Control.Monad.Parallel as MP

import Debug.Trace

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

data UserData = UserData
  { nodeGraph    :: M.Map String G.GeglNode
  , actors       :: M.Map String (Actor String)
  , foreground   :: G.GeglBuffer
  , lastTick     :: Double
  , updateActors :: [Actor String]
  }

load :: SDL.Surface -> IO UserData
load _ = do
  traceM "loading"
  root <- G.gegl_node_new
  traceM "new root node"
  let bgProps = props $ prop "path" ("examples/example04/panorama.jpg" :: String)
  bg <- G.gegl_node_new_child root $ G.Operation "gegl:jpg-load" bgProps
  bgScaleProps <- return $  props $ do
    prop "y" (600 :: Double)
    prop "sampler" (fromEnum G.GeglSamplerCubic)
  bgScale <- G.gegl_node_new_child root $
    G.Operation "gegl:scale-size-keepaspect" bgScaleProps
  bgTransProps <- return $ props $ do
    prop "x" (0 :: Double)
    prop "y" (0 :: Double)
    prop "sampler" (fromEnum G.GeglSamplerCubic)
  bgTrans <- G.gegl_node_new_child root $ G.Operation "gegl:translate" bgTransProps
  traceM "background"
  over <- G.gegl_node_new_child root G.defaultOverOperation
  traceM "over"
  buffer <- G.gegl_buffer_new (Just $ G.GeglRectangle 0 0 800 600) =<<
    B.babl_format (B.PixelFormat B.RGBA B.CFfloat)
  sink <- G.gegl_node_new_child root $ G.Operation "gegl:copy-buffer" $
    props $
    prop "buffer" buffer
  traceM "buffer-sink"
  rectProps <- return $ props $ do
    prop "x" (50 :: Double)
    prop "y" (290 :: Double)
    prop "width" (20::Double)
    prop "height" (20::Double)
    prop "color" $ G.RGBA 1 0 0 0.5
  rect <- G.gegl_node_new_child root $ G.Operation "gegl:rectangle" rectProps
  traceM "rect"
  crop <- G.gegl_node_new_child root $ G.Operation "gegl:crop" $
    props $ do
      prop "width" (800::Double)
      prop "height" (600::Double)
  G.gegl_node_link_many [bg, bgTrans, bgScale, over, crop, sink]
  _ <- G.gegl_node_connect_to rect "output" over "aux"
  rectActor <- return $ Actor (map
    (\p -> ActorProperty
      (G.propertyName p)
      (G.propertyValue p)
      (Just "rect")
      )rectProps
    ) (M.singleton "rect" rect)
  bgActor <- return $ Actor (map
    (\p -> ActorProperty
      (G.propertyName p)
      (G.propertyValue p)
      (Just "bg")
      )bgProps ++
    map (\p -> ActorProperty
      (G.propertyName p)
      (G.propertyValue p)
      (Just "scale")
      ) bgScaleProps ++
    map (\p -> ActorProperty
      (G.propertyName p)
      (G.propertyValue p)
      (Just "trans")
      ) bgTransProps
    ) (M.fromList
      [ ("bg", bg)
      , ("trans", bgTrans)
      , ("scale", bgScale)
      ])
  traceM "connections made"
  myMap <- return $ M.fromList
    [ ("root"        , root)
    , ("over"        , over)
    , ("background"  , bg)
    , ("sink"        , sink)
    , ("rect"        , rect)
    , ("crop"        , crop)
    ]
  traceM "loading complete"
  actorMap <- return $ M.fromList
    [ ("rect", rectActor)
    , ("background", bgActor)
    ]
  return UserData
    { nodeGraph    = myMap
    , actors       = actorMap
    , foreground   = buffer
    , lastTick     = 0
    , updateActors = []
    }

-- drawInit :: Affection UserData ()
-- drawInit = do
--   UserData{..} <- getAffection
--   present (GeglRectangle 0 0 800 600) foreground True

draw :: Affection UserData ()
draw = do
  ud@UserData{..} <- getAffection
  MP.mapM_ applyProperties updateActors
  putAffection ud
    { updateActors = []
    }
  process (nodeGraph M.! "sink")
  present (GeglRectangle 0 0 800 600) foreground True

update :: Affection UserData ()
update = do
  traceM "updating"

  tick <- getElapsedTime
  ud <- getAffection
  putAffection $ ud { lastTick = tick }

  let dt = tick - lastTick ud
  return ()
  traceM $ show (1 / dt) ++ " FPS"

handle :: SDL.EventPayload -> Affection UserData ()
handle (SDL.KeyboardEvent dat) =
  when (SDL.keyboardEventKeyMotion dat == SDL.Pressed) $ do
    ud <- getAffection
    (G.PropertyDouble xpos) <-
      return $ apValue $ fromJust $ L.find (\a -> "x" == apName a) $
        actorProperties $ actors ud M.! "rect"
    if xpos >= 40 && xpos <= 760
    then do
      nmap <- return $ M.adjust
        (updateProperties $ props $ prop "x" $
          case SDL.keysymKeycode $ SDL.keyboardEventKeysym dat of
            SDL.KeycodeLeft -> xpos - 20
            SDL.KeycodeRight -> xpos + 20
            _ -> xpos
          )
        "rect"
        (actors ud)
      putAffection ud
        { actors = nmap
        , updateActors = (nmap M.! "rect") : updateActors ud
        }
    else do
      (G.PropertyDouble bgPos) <-
        return $ apValue $ fromJust $ L.find (\a -> "x" == apName a) $
          actorProperties $ actors ud M.! "background"
      nmap <- return $ M.adjust
        (updateProperties $ props $ prop "x" $
          if xpos < 40
          then
            case SDL.keysymKeycode $ SDL.keyboardEventKeysym dat of
              SDL.KeycodeLeft ->
                if bgPos <= 0 then bgPos + 20 else bgPos
              SDL.KeycodeRight ->
                bgPos
              _ -> bgPos
          else
            case SDL.keysymKeycode $ SDL.keyboardEventKeysym dat of
              SDL.KeycodeLeft ->
                bgPos
              SDL.KeycodeRight ->
                if bgPos >= -2489 then bgPos - 20 else bgPos
              _ -> bgPos
          )
        "background"
        (actors ud)
      nmap2 <- return $ M.adjust
        (updateProperties $ props $ prop "x" $
          case SDL.keysymKeycode $ SDL.keyboardEventKeysym dat of
            SDL.KeycodeLeft ->
              if xpos < 40
              then
                xpos
              else
                xpos - 20
            SDL.KeycodeRight ->
              if xpos < 40
              then
                xpos + 20
              else
                xpos
            _ -> xpos
          )
        "rect"
        nmap
      putAffection ud
        { actors = nmap2
        , updateActors = (nmap2 M.! "background") : (nmap2 M.! "rect") : updateActors ud
        }

handle (SDL.WindowClosedEvent _) = do
  traceM "seeya!"
  quit

handle _ =
  return ()

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