Re: [HOpenGL] Important changes to OpenGLRaw

On Fri, Oct 26, 2012 at 1:02 PM, Dan Haraj wrote:

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.

Great.

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

Good point. The easiest thing is to try removing it and see if anything requires it. We're using travis-ci to build all the OpenGL packages now which helps with this sort of testing. Thanks, Jason

On Fri, Oct 26, 2012 at 1:25 AM, Jason Dagit 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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