[HOpenGL] Important changes to OpenGLRaw

[Dan Haraj]

I like this change. The issues you brought up have been relevant to me. A
long while ago I had a severe performance bug because of coercions between
GL float types and C float types that went away when I replaced them with
unsafeCoercions.

Glancing at the source for Raw, does this mean that include/CTypes.h is no
longer required?

On Fri, Oct 26, 2012 at 1:25 AM, Jason Dagit <dagitj at gmail.com> wrote:

> Hello,
>
> At some point in the past, OpenGLRaw was converted to use newtype wrappers
> for the GLfoo types, such as GLenum. I think this makes a certain amount of
> sense. It's certainly makes type safety easier.  There have also been
> significant downsides to this:
>
>   * The CPP macros to make these definitions are borrowed verbatim from
> GHC sources and required updates with new GHC releases in order to stay
> compatible. Although, it hasn't been a problem yet, it's conceivable this
> will conflict with supporting different versions of GHC at some point.
>   * Optimization rules have to be written against these newtypes and
> forgetting them can lead to significant performance degradation or extra
> verbosity for people using the bindings.
>   * You have to reach pretty deep into GHC to make it possible for the
> newtypes to work in the unboxed vectors provided by the vector package.
> This is again, another missed opportunity for high performance code.
>
> If you look at the current HEAD of the master branch for the OpenGLRaw
> code on github: https://github.com/haskell-opengl/OpenGLRaw
>
> You will see some changes including:
>   * All of the newtypes mentioned above have been changed to type aliases
>   * Version bumped to 1.3.x
>   * TypesInternal module has gone away
>
> Thanks for these changes goes to Trevor Elliott.
>
> If you think this move to type aliases is an error, please let me know (on
> list or personal email is fine). I'd like to do a push to Hackage sometime
> soon, but I want to give people a chance to comment first. By this time
> next week, I would like to post a new release, unless someone has an
> objection.
>
> There is another wonderful set of changes you will find in HEAD. I
> received patches from "ozelis" to add support for the NVidia path rendering
> extension. Very cool!
>
> Thanks!
> Jason
>
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