1 files changed, 72 insertions, 0 deletions

diff --git a/CubeMap.hs b/CubeMap.hs
new file mode 100644
index 0000000..337881f
--- /dev/null
+++ b/CubeMap.hs
@@ -0,0 +1,72 @@
+module CubeMap
+    ( loadSkyboxes
+    , Skyboxes(..)
+    ) where
+
+import LambdaCube.GL as LC
+import LambdaCube.GL.Mesh as LC
+import LambdaCube.GL.Data (uploadCubeMapToGPU)
+
+import Data.Maybe
+import Control.Monad
+import Data.List
+import System.Directory
+import System.FilePath
+import Codec.Archive.Zip
+import qualified Data.ByteString.Lazy as Lazy
+import Codec.Picture as Juicy
+
+image_names_xyz_dir :: [String]
+image_names_xyz_dir =
+    [ "xforward"
+    , "xreverse"
+    , "yforward"
+    , "yreverse"
+    , "zforward"
+    , "zreverse" ]
+
+image_names_np_xyz :: [String]
+image_names_np_xyz =
+    [ "negx"
+    , "negy"
+    , "negz"
+    , "posx"
+    , "posy"
+    , "posz" ]
+
+
+filterImageNames :: [String] -> [String]
+filterImageNames fns = map snd $ sortOn fst
+                        $ go (zip [0..] image_names_xyz_dir)
+                             (zip [1,3,5,0,2,4] image_names_np_xyz)
+                             $ sort fns
+ where
+    go ((n,x):xs) ys         (fn:fns) | x `isPrefixOf` fn = (n,fn) : go xs ys fns
+    go xs         ((n,y):ys) (fn:fns) | y `isPrefixOf` fn = (n,fn) : go xs ys fns
+    go xs         ys         ( _:fns)                     = go xs ys fns
+    go xs         ys         []                           = []
+
+
+data Skyboxes = Skyboxes
+    { skyboxCount :: Int
+    , skyboxNames :: [String]
+    , skyboxLoad  :: Int -> IO (Either String [DynamicImage])
+    }
+
+loadSkyboxes :: IO Skyboxes
+loadSkyboxes = do
+    let dir = "./skyboxes"
+    zips <- listDirectory dir
+    let len = length zips
+    return Skyboxes
+        { skyboxCount = len
+        , skyboxNames = zips
+        , skyboxLoad  = \n -> do
+                let fn = zips !! mod n len
+                archive <- toArchive <$> Lazy.readFile (dir </> fn)
+                let es = mapMaybe (`findEntryByPath` archive) $ filterImageNames (filesInArchive archive)
+                imgs <- forM es $ \entry -> do
+                    return $ Juicy.decodeImage $ Lazy.toStrict $ fromEntry entry
+                return $ sequence imgs
+        }
+