[HOpenGL] GLU NURBS rendered wrongly

[Jason Dagit]

On Tue, Oct 18, 2011 at 4:20 AM, Alexey Karakulov <ankarakulov at gmail.com> wrote:
> I suppose I found the reason. It's in the ControlPoint class. Attached the
> patch for Graphics/Rendering/OpenGL/GL/ControlPoint.hs

Thanks for the report and the patch.  Could I ask you to send a pull
request on github to this repository?
https://github.com/haskell-opengl/OpenGL

Thanks,
Jason

>
> On Tue, Oct 18, 2011 at 1:02 PM, Alexey Karakulov <ankarakulov at gmail.com>
> wrote:
>>
>> Description:
>> GLU NURBS are rendered wrongly with newer versions of OpenGL.
>> E.g. when the 9-point rectangular representation for a circle is used,
>> this picture is a result (instead of a proper circle):
>> http://i.stack.imgur.com/waoRm.png
>> There are other details at the
>> http://stackoverflow.com/questions/7798662/glu-nurbs-rendered-wrongly
>>
>> Versions:
>> The bug appears when OpenGL>=2.3 is used. With older versions the NURBS
>> for circle is rendered correctly:
>> $ ghc -package OpenGL-2.2.3.0 -package GLUT-2.1.2.1 --make Circle.hs &&
>> ./Circle
>>
>> Platforms tested:
>> ArchLinux 64-bit, Gentoo (don't know architecture).
>>
>> The Circle.hs file which draws the NURBS circle is attached.
>>
>
>
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