[Haskell-cafe] New OpenGL package: efficient way to convert datatypes?

[Roel van Dijk]

If you are *really* sure that the runtime representation is the same
you could use usafeCoerce. You could use a small test function for
profiling, something like:

convertGLfloat :: GLfloat -> Float
convertGLFloat = realToFrac
-- convertGLFloat = unsafeCoerce

and toggle between the two (assuming you won't get a segmentation fault).

Another option is to not convert at all but use the GL types
everywhere. Either explicitly or by exploiting polymorphism.