diff options
author | Juan J. Martinez <jjm@usebox.net> | 2023-02-23 12:21:24 +0000 |
---|---|---|
committer | Juan J. Martinez <jjm@usebox.net> | 2023-02-23 12:21:24 +0000 |
commit | ce13d7eaa45b59647325b97e40906c54dbcf4b38 (patch) | |
tree | 7de8d3ddf19313c54f892fb9024d161835921354 /src | |
parent | 3312d78396821bf8fee9e158066fde05bde77a9e (diff) | |
download | space-plat-hs-ce13d7eaa45b59647325b97e40906c54dbcf4b38.tar.gz space-plat-hs-ce13d7eaa45b59647325b97e40906c54dbcf4b38.zip |
Bitmap font
Diffstat (limited to 'src')
-rw-r--r-- | src/Game.hs | 7 | ||||
-rw-r--r-- | src/Game/BitmapFont.hs | 49 |
2 files changed, 56 insertions, 0 deletions
diff --git a/src/Game.hs b/src/Game.hs index 1e0245b..53be0ad 100644 --- a/src/Game.hs +++ b/src/Game.hs @@ -5,6 +5,7 @@ import Data.IORef import Data.Maybe (fromMaybe) import Data.Text (pack) import Foreign.C.Types (CInt) +import qualified Game.BitmapFont as BF import qualified Game.Controller as C import qualified Game.Entities as E import qualified Game.Hud as H @@ -44,6 +45,7 @@ data Env = Env controls :: IORef C.Controls, map :: M.Map, sprites :: S.SpriteSheet, + font :: BF.BitmapFont, entities :: IORef E.Entities, hud :: H.Hud, state :: IORef GS.State @@ -73,9 +75,11 @@ main = do renderRect <- newIORef defaultRenderRect tsTexture <- SDL.Image.loadTexture renderer "data/tiles.png" ssTexture <- SDL.Image.loadTexture renderer "data/sprites.png" + bfTexture <- SDL.Image.loadTexture renderer "data/font.png" controls <- newIORef =<< C.init map' <- M.load "data/map.json" tsTexture sprites <- S.load "data/sprites.json" ssTexture + font <- BF.load "data/font.json" bfTexture state <- newIORef GS.State @@ -98,6 +102,7 @@ main = do controls = controls, map = map', sprites = sprites, + font = font, entities = entities, hud = hud, state = state @@ -140,6 +145,7 @@ gameLoop = do map' = env.map entities = env.entities hud = env.hud + font = env.font events <- map SDL.eventPayload <$> SDL.pollEvents @@ -163,6 +169,7 @@ gameLoop = do M.render renderer map' H.render renderer hud E.render renderer updated + BF.renderText renderer font 120 178 "This is a test!" SDL.rendererRenderTarget renderer $= Nothing SDL.clear renderer diff --git a/src/Game/BitmapFont.hs b/src/Game/BitmapFont.hs new file mode 100644 index 0000000..d42f293 --- /dev/null +++ b/src/Game/BitmapFont.hs @@ -0,0 +1,49 @@ +module Game.BitmapFont (BitmapFont, load, renderText) where + +import Control.Monad +import Data.Map (Map) +import qualified Data.Map as Map +import Data.Maybe (fromMaybe) +import Foreign.C.Types (CInt) +import qualified Game.Utils as U +import qualified SDL +import Text.JSON + +data FontDesc = FontDesc Int Int (Map Char (SDL.Rectangle CInt)) + +data BitmapFont = BitmapFont FontDesc SDL.Texture + +instance JSON FontDesc where + showJSON = undefined + readJSON (JSObject obj) = do + w <- valFromObj "width" obj + h <- valFromObj "height" obj + m <- valFromObj "map" obj + pure $ FontDesc w h $ Map.fromList (zipWith (curry (toRect w h)) m [0 ..]) + where + -- we store a Map from char to the SDL rect containing the glyph + toRect :: Int -> Int -> (Char, Int) -> (Char, SDL.Rectangle CInt) + toRect w h (c, i) = (c, U.rect (i * w) 0 w h) + readJSON _ = mzero + +-- | Load a bitmap font description from a JSON file. +-- +-- The texture is expected to have the glyphs in a single line plus a special one at the end to be used when a character is not found in the font map. +load :: String -> SDL.Texture -> IO BitmapFont +load filename tex = do + d <- readFile filename + case decode d :: Result FontDesc of + Ok desc -> pure $ BitmapFont desc tex + Error e -> error e + +-- | Render a string at position x, y using the prodided bitmap font. +renderText :: SDL.Renderer -> BitmapFont -> Int -> Int -> String -> IO () +renderText renderer (BitmapFont (FontDesc w h m) tex) x y text = mapM_ renderOne (zip [0 ..] text) + where + renderOne :: (Int, Char) -> IO () + renderOne (i, c) = + SDL.copy renderer tex (Just src) (Just dst) + where + -- find the glyph or render the special one as error + src = fromMaybe (U.rect (length m * w) 0 w h) (Map.lookup c m) + dst = U.rect (x + i * w) y w h |