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From:	=?iso-8859-1?B?QW5kcukgQmxlYXU=?= <andre_bleau AT hotmail DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	Re: OpenGL linking problems
Date:	Sat, 4 Sep 2010 12:29:39 -0400
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David Doria wrote:
=20
> I'm trying to build a library (VTK) in Cygwin. I am getting a lot of
> errors like this
>=20
> undefined reference to `_glDepthMask'
> undefined reference to?`_glGetIntegerv'
> undefined reference to?`_glMatrixMode'
>=20
> I installed ALL of the cygwin packages to try to avoid problems like
> this. I also added
>=20
> export LD_LIBRARY_PATH=3D$LD_LIBRARY_PATH:/lib
>=20
> to my ~/.bash_profile
>=20
> Anyone know how to get something to link against OpenGL in cygwin?
=20
Well, we need more info to help us help you. What kind of application are y=
ou trying to build? X11 or native? There are 2 ways to build OpenGL-related=
 programs:
=20
1- Using native OpenGL, with driver supported hardware acceleration. For th=
at, you need some way to=20
get a graphic device context. One portable way to do that is to use the GLU=
T library, provided by=20
the opengl package that I maintain. Look at the doc in /usr/share/doc/openg=
l-1.1.0 to learn how to=20
do that.
=20
The OpenGL implementation in that case is provided by Window's opengl32.dll=
. Cygwin's w32api package=20
provides the headers and link library for that version of OpenGL.
=20
LD_LIBRARY_PATH has no effect if you go that way.
=20
2- Using X11, which provides an opengl implementation. At one point, there =
was support for hardware=20
acceleration; then, it went away; I don't know if it came back or if it is =
coming back "soon". I will let the maintainer of the libGL* packages answer=
 questions you may have about it. You would better send them to cygwin-xfre=
e at cygwin dot com .
=20
>=20
> Thanks,
>=20
> David
>=20
=20
- Andr=E9 Bleau, Cygwin's opengl package maintainer.

Please send any question or comment about the opengl package to cygwin at c=
ygwin dot com,
not directly to me.
=20=20=09=09=20=09=20=20=20=09=09=20=20

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