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.spezzano@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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