RE: Experiencing problems with OpenGL

[André Bleau <andre_bleau at hotmail dot com>]

Julian Moorsm wrote:

> Hi everybody,
> ?

Hi Julian,

Welcome to the Cygwin list.

> First and foremost I have to say that I am so happy with the concept of
> Cygwin and to the Cygwin volunteers ?Keep up with the good work. It is
> so much appreciated?. I am having a little problem with compiling an
> OpenGL sourcefile.
> ?
> Here's what I've done so far:
> ?
> Installed Cygwin using setup.exe to c:\cygwin using default settings
> onto Windows XP SP 2 OS.
> Installed make, g++ and nano by running setup.exe again.
> Read the readme file located under /usr/share/opengl1-1-0.
> Little confused about what switches I should use when compiling .cpp
> file and whether to use a makefile or not.
> Ran the OpenGL examples to test if it?s possible to run the .exe files
> compiled and linked under Cygwin. All examples ran successfully.
> Tried to compile the following .cpp file whilst using -lglu32 -lopengl32
> switches with g++:

So, you have done some homework; that's good. Now, it would have been easier 
to help you if you had written in your help request the _exact command line_ 
you had typed to invoke g++, along with the _exact error messages_ you 
received.

> ...
>
> An example program
>
> ...
>
> This .cpp source file compiles perfectly under Visual Studio 6.0, but as
> I don?t have it anymore I?m unable to compile it now. Is there anyway I
> can compile this source under Cygwin or will I have to rewrite it and
> make use of the GLUI and GLUX libraries. If so could you explain this
> process for me with compile/linker command line switches. Thanks for
> your help.
>
> Julian

I just copied your example code to a file I named julian.cpp and compiled 
and linked it with:

g++ -o julian julian.cpp -lglu32 -lopengl32 -lgdi32

I got 3 warnings but no error. julian.exe is runable. While it is true that 
most people developing Windows native OpenGL applications with Cygwin use a 
toolkit such as GLUT or GLUI, it is certainly possible to do without; just 
add -lgdi32 at the end of your command line to resolve calls to the M$ 
Graphics Device Interface library. If you use other functions from M$ libs, 
you will have to add the approriate -l arguments. See /usr/lib/w32api to see 
what's available.

Regards,

André Bleau,
Cygwin's OpenGL package maintainer.

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