From fc20aae36dfa150795967c46048abc8581b37d48 Mon Sep 17 00:00:00 2001
From: Joe Crayne <joe@jerkface.net>
Date: Fri, 14 Jun 2019 21:17:01 -0400
Subject: Switched to homegrown wavefront parser.

---
 LoadMesh.hs      | 14 ++++++++------
 lambda-gtk.cabal |  2 +-
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/LoadMesh.hs b/LoadMesh.hs
index 69e66d6..affadba 100644
--- a/LoadMesh.hs
+++ b/LoadMesh.hs
@@ -12,23 +12,25 @@ import Data.Map (Map)
 import qualified Data.Map as Map
 import qualified Data.Vector as V
 import qualified Data.ByteString as SB
+import qualified Data.ByteString.Lazy.Char8 as L
 import Data.Text (unpack,Text)
 import Data.List (groupBy,nub)
 
 import Codec.Picture as Juicy
-import Codec.Wavefront
+import Wavefront
+import Wavefront.Types
 import Data.Aeson
 
 type MeshData = ([(Mesh,Maybe Text)],MtlLib)
 
 loadOBJ :: String -> IO (Either String MeshData)
-loadOBJ fname = fromFile fname >>= \case -- load geometry
-  Left err -> putStrLn err >> return (Left err)
-  Right obj@WavefrontOBJ{..} -> do
+loadOBJ fname = L.readFile fname >>= \bs -> do
+    let  obj@OBJ{..} = parse bs
     -- load materials
     mtlLib <- mconcat . V.toList <$> mapM (readMtl . unpack) objMtlLibs
     return $ Right (objToMesh obj,mtlLib)
 
+
 uploadOBJToGPU :: MeshData -> IO ([(GPUMesh, Maybe Text)], MtlLib)
 uploadOBJToGPU (subModels,mtlLib) = do
     gpuSubModels <- forM subModels $ \(mesh,mat) -> LambdaCubeGL.uploadMeshToGPU mesh >>= \a -> return (a,mat)
@@ -50,7 +52,7 @@ uploadMtlLib mtlLib = do
   return $ (\a -> (a, maybe whiteTex (fromMaybe checkerTex . flip Map.lookup textureLib) . mtl_map_Kd $ a)) <$> mtlLib
 
 objToMesh :: WavefrontOBJ -> [(Mesh,Maybe Text)]
-objToMesh WavefrontOBJ{..} = [(toMesh faceGroup, elMtl . head $ faceGroup) | faceGroup <- faces] where
+objToMesh OBJ{..} = [(toMesh faceGroup, elMtl . head $ faceGroup) | faceGroup <- faces] where
   faces = groupBy (\a b -> elMtl a == elMtl b) (V.toList objFaces)
   toMesh l = Mesh
     { mAttributes   = Map.fromList
@@ -66,7 +68,7 @@ objToMesh WavefrontOBJ{..} = [(toMesh faceGroup, elMtl . head $ faceGroup) | fac
         defaultPosition = Location 0 0 0 0
         defaultNormal = Normal 0 0 0
         defaultTexCoord = TexCoord 0 0 0
-        v !- i = v V.!? (i-1)
+        v !- i = v V.!? i
         toVertex FaceIndex{..} = ( let Location x y z w = fromMaybe defaultPosition (objLocations !- faceLocIndex)            in V4 x y z w
                                  , let Normal x y z     = fromMaybe defaultNormal ((objNormals !-) =<< faceNorIndex)          in V3 x y z
                                  , let TexCoord x y z   = fromMaybe defaultTexCoord ((objTexCoords !-) =<< faceTexCoordIndex) in V3 x y z
diff --git a/lambda-gtk.cabal b/lambda-gtk.cabal
index 86269e5..75bcdfc 100644
--- a/lambda-gtk.cabal
+++ b/lambda-gtk.cabal
@@ -61,7 +61,7 @@ executable meshsketch
                        -- writer monad
                        mtl,
                        -- rendering
-                       lambdacube-ir, lambdacube-gl >=0.5.3, OpenGL, wavefront,
+                       lambdacube-ir, lambdacube-gl >=0.5.3, OpenGL, wavefront-obj,
                        -- GUI
                        gi-gdk , gi-glib , gi-gobject , gi-gtk , haskell-gi-base
 
-- 
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