Because GLfloat is simply a newtype wrapper for CFloat, which has a Random
instance, I would do:
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
deriving instance Random GLFloat
On Wed, May 2, 2012 at 6:29 PM, Mark Spezzano
<mark.spezz...@chariot.net.au>wrote:
> Hi Haskellers,
>
> I'm trying to generate a random vertex in OpenGL as follows.
>
> genPosition :: IO (Vertex3 GLfloat)
> genPosition = do x <- getStdRandom $ randomR (-1.6,1.6)
> y <- getStdRandom $ randomR (-1.0,1.0)
> return (Vertex3 x y (-1))
>
> Unfortunately the compiler complains about me having to implement an
> instance of Random for GLfloat.
>
> How do I do this (or avoid having to do this)?
>
> Cheers,
>
> Mark
>
>
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