Start to separate VAO and VBO data types

src/Shader/Data.hs

@@ -12,6 +12,9 @@ module Shader.Data
 -- | Lens functions
     , vaoName
     , vaoVBO
+    , vaoAttribSizes
+    , vaoStride
+
     , vboName
     , vboPtr
     , vboAttribSizes
@@ -45,6 +48,8 @@ data FullShader = FullShader
 and its buffer targets.  -}
 data VAO = VAO
     { _vaoName  :: GLuint
+    , _vaoAttribSizes :: [Int]  -- ^ It is not clear to me if this is necessary to store or not
+    , _vaoStride      :: Int
     , _vaoVBO   :: VBO
     }
 {- | Vertex buffer object: contains the reference to the object,