pituicat/src/Map.hs

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{-# LANGUAGE OverloadedStrings #-}
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module Map where
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import qualified Graphics.Rendering.OpenGL as GL
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import Linear
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import Codec.Picture
import qualified Data.Vector as V
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import Control.Monad (foldM)
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-- internal imports
import Types
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constructMap :: LevelDescriptor -> GL.GLuint -> IO LevelMap
constructMap desc tilemapSlot = do
(layers, dimensions) <- foldM
(\(layers, dims) descTup -> do
(nlayer, ndims) <- readLayer descTup
if not (null layers) && ndims /= dims
then error ("Map Layer dimensions mismatch in: " <> snd descTup)
else return (layers ++ [nlayer], ndims)
)
([], V2 0 0)
(V.fromList $ levelLayerPath desc)
tilemap <- uncurry TileMap <$> newTexture (levelTileMap desc) tilemapSlot
LevelMap
<$> pure (V.fromList layers)
<*> pure (levelWalkLayer desc)
<*> pure (fmap fromIntegral dimensions)
<*> pure tilemap
<*> pure (V2 (fst $ levelStartPos desc) (snd $ levelStartPos desc))
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readLayer
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:: (Word, FilePath) -- | index and path of the layer descriptor image
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-> IO (MapLayer, V2 Int)
readLayer (idx, path) = do
img <- either error convertRGBA8 <$> readImage path
let width = imageWidth img
height = imageHeight img
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layer = V.foldl
(\acc (py, px) -> case (pixelAt img px py) of
(PixelRGBA8 r g b _) -> if r >= 253
then
acc `V.snoc` Tile
(V2 (255 - fromIntegral g) (255 - fromIntegral b))
(case r of
255 -> Solid
254 -> Platform
_ -> Decoration
)
else
acc
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)
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V.empty
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(V.fromList ((,) <$> [0 .. height - 1] <*> [0 .. width - 1]))
return (MapLayer layer, V2 width height)