aboutsummaryrefslogtreecommitdiff
path: root/src/Game/Map.hs
blob: dbb0e6c0e410c19f1bb83d66de6fef4a26cff0d8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
{-# OPTIONS_GHC -Wno-orphans #-}

module Game.Map
  ( Map (..),
    Object (..),
    objects,
    totalBatteries,
    loadMapList,
    load,
    render,
    update,
    isBlocked,
    isBlockedDeadly,
    isPlayer,
    Viewport (..),
    viewport,
  )
where

import Control.Applicative ((<|>))
import Control.Monad
import Data.Maybe (fromMaybe)
import Data.Vector (Vector)
import Data.Vector qualified as Vector
import Game.Entities.Types (Dir (..))
import Game.Utils qualified as U
import SDL (($=))
import SDL qualified
import Text.JSON
import Text.JSON.Types

frameDelay :: Int
frameDelay = 6

deadlyTileId :: Int
deadlyTileId = 29

data Tileset = Tileset
  { cols :: Int,
    width :: Int,
    height :: Int,
    firstGid :: Int,
    tilecount :: Int,
    tiles :: Vector Tile
  }
  deriving (Show)

data Layer
  = TileLayer
      {name :: String, tiles :: Vector Int}
  | ObjectLayer
      {name :: String, objects :: Vector Object}
  deriving (Show)

data PropertyValue = PropertyValueBool Bool | PropertyValueInt Int | PropertyValueString String

data Property = Property String PropertyValue

-- | The object types in the map.
data Object
  = PlayerEntity Int Int
  | BatteryEntity Int Int
  | SlimeEntity Int Int Dir
  | RobotEntity Int Int Dir
  | ShooterEntity Int Int Dir
  | RunnerEntity Int Int Dir
  | TrackerEntity Int Int Dir
  deriving (Show, Eq, Ord)

data JsonMapData = JsonMapData
  { width :: Int,
    height :: Int,
    tilesets :: Vector Tileset,
    layers :: Vector Layer
  }
  deriving (Show)

newtype Frame = Frame Int deriving (Show)

data Tile = Tile
  {id :: Int, animation :: Vector Frame}
  deriving (Show)

instance (JSON a) => JSON (Vector a) where
  showJSON = undefined
  readJSON obj = fmap Vector.fromList (readJSON obj)

instance JSON Property where
  showJSON = undefined
  readJSON (JSObject obj) = do
    Property
      <$> valFromObj "name" obj
      <*> case get_field obj "type" of
        Just "bool" -> PropertyValueBool <$> valFromObj "value" obj
        Just "int" -> PropertyValueInt <$> valFromObj "value" obj
        Just "string" -> PropertyValueString <$> valFromObj "value" obj
        _ -> Error "unsupported property value type"
  readJSON _ = mzero

instance JSON Frame where
  showJSON = undefined
  readJSON (JSObject obj) = do
    Frame <$> valFromObj "tileid" obj
  readJSON _ = mzero

instance JSON Tile where
  showJSON = undefined
  readJSON (JSObject obj) = do
    Tile
      <$> valFromObj "id" obj
      <*> valFromObj "animation" obj
  readJSON _ = mzero

instance JSON Tileset where
  showJSON = undefined
  readJSON (JSObject obj) = do
    Tileset
      <$> valFromObj "columns" obj
      <*> valFromObj "tilewidth" obj
      <*> valFromObj "tileheight" obj
      <*> valFromObj "firstgid" obj
      <*> valFromObj "tilecount" obj
      <*> (valFromObj "tiles" obj <|> pure Vector.empty)
  readJSON _ = mzero

instance JSON Layer where
  showJSON = undefined
  readJSON (JSObject obj) =
    case get_field obj "type" of
      Just "tilelayer" ->
        TileLayer <$> valFromObj "name" obj <*> valFromObj "data" obj
      Just "objectgroup" ->
        ObjectLayer <$> valFromObj "name" obj <*> valFromObj "objects" obj
      _ -> Error "unsupported layer type"
  readJSON _ = mzero

-- Gets the "flip" custom property; if present and set, the entity will face left.
-- Only takes into account the first "flip" property found.
getPropertyDir :: JSObject JSValue -> Result Dir
getPropertyDir obj = do
  props <- valFromObj "properties" obj <|> pure Vector.empty
  pure $ case Vector.find flipProp props of
    Just _ -> DirLeft
    Nothing -> DirRight
  where
    flipProp :: Property -> Bool
    flipProp (Property "flip" (PropertyValueBool True)) = True
    flipProp _ = False

instance JSON Object where
  showJSON = undefined
  readJSON (JSObject obj) =
    case get_field obj "name" of
      Just "Player" ->
        PlayerEntity <$> valFromObj "x" obj <*> valFromObj "y" obj
      Just "Battery" ->
        BatteryEntity <$> valFromObj "x" obj <*> valFromObj "y" obj
      Just "Slime" ->
        SlimeEntity <$> valFromObj "x" obj <*> valFromObj "y" obj <*> getPropertyDir obj
      Just "Robot" ->
        RobotEntity <$> valFromObj "x" obj <*> valFromObj "y" obj <*> getPropertyDir obj
      Just "Shooter" ->
        ShooterEntity <$> valFromObj "x" obj <*> valFromObj "y" obj <*> getPropertyDir obj
      Just "Runner" ->
        RunnerEntity <$> valFromObj "x" obj <*> valFromObj "y" obj <*> getPropertyDir obj
      Just "Tracker" ->
        TrackerEntity <$> valFromObj "x" obj <*> valFromObj "y" obj <*> getPropertyDir obj
      Just (JSString (JSONString s)) -> Error $ "unsupported entity " ++ show s
      e -> Error $ "unsupported entity in " ++ show e
  readJSON _ = mzero

instance JSON JsonMapData where
  showJSON = undefined
  readJSON (JSObject obj) =
    JsonMapData
      <$> valFromObj "width" obj
      <*> valFromObj "height" obj
      <*> valFromObj "tilesets" obj
      <*> valFromObj "layers" obj
  readJSON _ = mzero

data MapData = MapData
  { width :: Int,
    height :: Int,
    tilesets :: Vector Tileset,
    tileLayers :: Vector (Vector Int),
    blocked :: Vector Int,
    objects :: Vector Object
  }
  deriving (Show)

data Viewport = Viewport Int Int Int Int

data MapState = MapState
  { delay :: Int,
    step :: Int
  }

data Map = Map MapData SDL.Texture MapState

-- | Loads a list of maps from JSON file.
loadMapList :: String -> IO [String]
loadMapList filename = do
  d <- readFile filename
  case decode d :: Result [String] of
    Ok s -> pure s
    Error e -> error e

-- | Loads a map from a JSON file.
load :: String -> SDL.Texture -> IO Map
load filename tex = do
  d <- readFile filename
  case decode d :: Result JsonMapData of
    Ok s -> do
      let tileLayers = Vector.mapMaybe (filterTileLayer (\l -> l.name /= "Blocked")) s.layers
          blockedLayers = Vector.mapMaybe (filterTileLayer (\l -> l.name == "Blocked")) s.layers
      blockedLayer <- Vector.headM blockedLayers
      pure $
        Map
          MapData
            { width = s.width,
              height = s.height,
              tilesets = s.tilesets,
              tileLayers = tileLayers,
              blocked = blockedLayer,
              objects = join $ Vector.mapMaybe filterObjectLayer s.layers
            }
          tex
          (MapState 0 0)
    Error e -> error e
  where
    filterTileLayer :: (Layer -> Bool) -> Layer -> Maybe (Vector Int)
    filterTileLayer f l = case l of
      TileLayer _ tiles -> if f l then Just tiles else Nothing
      _ -> Nothing
    filterObjectLayer :: Layer -> Maybe (Vector Object)
    filterObjectLayer l = case l of
      ObjectLayer _ objs -> Just objs
      _ -> Nothing

-- | Check for collision detection vs "Blocked" TileLayer.
-- x and y in pixels.
isBlocked :: Map -> Int -> Int -> Bool
isBlocked (Map (MapData mapWidth _ tilesets _ blocked _) _ _) x y =
  blocked Vector.! ((x `div` ts.width) + (y `div` ts.height) * mapWidth) >= ts.firstGid
  where
    ts = Vector.head tilesets

-- | Check for collision detection vs deadly tiles in "Blocked" TileLayer.
-- x and y in pixels.
isBlockedDeadly :: Map -> Int -> Int -> Bool
isBlockedDeadly (Map (MapData mapWidth _ tilesets _ blocked _) _ _) x y =
  blocked Vector.! ((x `div` ts.width) + (y `div` ts.height) * mapWidth) == deadlyTileId + ts.firstGid
  where
    ts = Vector.head tilesets

-- | Return the objects in a map.
objects :: Map -> [Object]
objects (Map md _ _) = Vector.toList md.objects

isPlayer :: Object -> Bool
isPlayer (PlayerEntity _ _) = True
isPlayer _ = False

-- | Return the number of batteries in a map.
totalBatteries :: Map -> Int
totalBatteries (Map md _ _) = Vector.length $ Vector.filter isBattery md.objects
  where
    isBattery :: Object -> Bool
    isBattery (BatteryEntity _ _) = True
    isBattery _ = False

-- | Set the SDL viewport based on the map and the provided viewport coordinates.
-- It returns the viewport to be used by render.
-- Optionally an offset can be provided.
viewport :: SDL.Renderer -> Map -> Int -> Int -> Int -> Int -> Maybe (Int, Int) -> IO Viewport
viewport renderer (Map mapData _ _) vx vy vw vh offs = do
  SDL.rendererViewport renderer $= Just mapRect
  pure $ Viewport newx newy vw vh
  where
    tileset = Vector.head mapData.tilesets
    mapWidth = mapData.width * tileset.width
    mapHeight = mapData.height * tileset.height

    halfViewportWidth = vw `div` 2
    halfViewportHeight = vh `div` 2

    -- the coords are the center focus
    fx = max (vx - halfViewportWidth) 0
    fy = max (vy - halfViewportHeight) 0

    newx = min (if fx + halfViewportWidth > mapWidth then mapWidth - vw else fx) (mapWidth - vw)
    newy = min (if fy + halfViewportHeight > mapHeight then mapHeight - vh else fy) (mapHeight - vh)

    (offsx, offsy) = fromMaybe (0, 0) offs
    mapRect = U.rect (offsx - newx) (offsy - newy) (newx + vw) (newy + vh)

-- | Render a map.
-- Requires a Viewport from viewport.
render :: SDL.Renderer -> Map -> Viewport -> IO ()
render renderer (Map mapData tex (MapState _ step)) (Viewport vx vy vw vh) = do
  Vector.mapM_
    ( \layer ->
        Vector.mapM_
          ( \(x, y) ->
              -- clipping because we draw one extra row/col because the scroll
              when (x >= 0 && y >= 0 && x < mapData.width && y < mapData.height) $
                renderTile x y (layer Vector.! (x + (y * mapData.width)))
          )
          index
    )
    mapData.tileLayers
  where
    tileset = Vector.head mapData.tilesets
    tileWidth = tileset.width
    tileHeight = tileset.height

    -- origin x, y in tiles
    ox = vx `div` tileWidth - 1
    oy = vy `div` tileHeight - 1

    -- viewport size in tiles
    drawWidth = 1 + vw `div` tileWidth
    drawHeight = 1 + vh `div` tileHeight

    -- we draw one extra row/col
    index = Vector.fromList [(x, y) | x <- [ox .. ox + drawWidth], y <- [oy .. oy + drawHeight]]

    -- XXX: performance of this?
    findTileset :: Int -> Maybe Tileset
    findTileset tile = Vector.find (\t -> t.firstGid + t.tilecount > tile && t.firstGid <= tile) mapData.tilesets

    findTile :: Tileset -> Int -> Int
    findTile ts tile = case Vector.find (\t -> t.id == tile - ts.firstGid) ts.tiles of
      Nothing -> tile - ts.firstGid
      Just (Tile _ frames) -> fmap (\(Frame i) -> i) frames Vector.! (step `mod` Vector.length frames)

    renderTile :: Int -> Int -> Int -> IO ()
    renderTile x y tile =
      case findTileset tile of
        Nothing -> pure ()
        Just ts -> do
          let tsTile = findTile ts tile
              tx = tsTile `rem` ts.cols
              ty = tsTile `div` ts.cols
              src = U.rect (tx * ts.width) (ty * ts.height) ts.width ts.height
              dst = U.rect (x * tileWidth) (y * tileHeight) ts.width ts.height
          SDL.copy renderer tex (Just src) (Just dst)

-- | Update the state of the map.
update :: Map -> Map
update (Map mapData texture state)
  | state.delay < frameDelay = Map mapData texture state {delay = state.delay + 1}
  | otherwise = Map mapData texture state {delay = 0, step = state.step + 1}