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Re: Performance problem
- From: Andre Bleau <bleau at igb dot umontreal dot ca>
- To: cygwin at cygwin dot com
- Date: Wed, 09 Jul 2003 11:24:50 -0400
- Subject: Re: Performance problem
Vladimir Baltchev <vbaltch at orthosoft dot ca> wrote:
In fact you have 3 gl.h in cygwin but only one library - libGL, and it's
the X11 one...
Nope. There is also libopengl32.a (in /usr/lib/w32api). That's the one used
by the OpenGL package, and the one using hardware acceleration if available.
I understand what Andre is saying, but he said cygwin is offering an
opportunity to use a OpenGL package different from the X11 one.
In fact I am trying to use cygwin to avoid havy porting effort. Obviousely
OpenGL on cygwin is slow
Slow under X11 only.
and I'll forget about cygwin if I have to rewrite the application...
Anyways, thanks for the help
Larry Hall <cygwin-lh at cygwin dot com> wrote:
I think you're a little too fixated on the portability aspects such that
you're not really processing what Andre is saying. If you want
absolute minimal porting changes, the route you took is the proper one,
but you will suffer extreme performance degradation due to the fact that
all of the processing for GL will happen in software. If this isn't
acceptable to you, then you do need to do more porting so that you're
application works with Windows rather than X.
For that, you can go 100%
native Windows with your entire application
I think Larry means D3D here.
or you can use the OpenGL
package in Cygwin so that you only need to port the GL portion.
In fact, it's the converse. With the OpenGL package, the GL portion will be
100% compatible, so it won't need any porting. It is the window management
and user interface that will need to be ported.
no libGL with Windows implementation of GL or in the OpenGL package that
comes with Cygwin so I wouldn't waste any time trying to figure out why
you can't find one outside of the X package.
You may try to find some commercial, X11 server supporting hardware
acceleration for OpenGL. The XFree86 server of the Cygwin distribution is
not such a server.
The other way to build a portable application would be to use some OS
independent layer such as GLUT and its GLUI derivative. Both are part of
the OpenGL package.
André Bleau, Cygwin's OpenGL package maintainer.
email: bleau at igb dot umontreal dot ca
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