Re: OpenGL and Cygwin

[Andre Bleau <bleau at igb dot umontreal dot ca>]

Suresh Venkatasubramanian wrote:


> Hi,
>   I apologize in advance if this duplicates questions already asked and
> answered: I have searched the cygwin/cygwin-apps mailing lists already,
> and there appears to be no clear answer, and most of the FAQs are a bit
> outdated.
>
> I have an opengl program that I wish to compile under the cygwin
> environment, but using NO mesa drivers, only the native windows drivers.
> This program uses GLU and GLUT, as well as opengl and nvidia extensions.
>
> Now I have downloaded the nvidia extensions headers, and am able to create
> object files correctly, after some experimenting (it appears that I need
> to use the -mno-cygwin flag to enable the _WIN32 macros).

Do "the nvidia extensions headers" you downloaded include gl.h ? If yes, 
that could be your problem.


> However, I have severe problems when linking using g++ *.o -lglu32
> -lglut32 -lopengl32 (as per the /usr/doc/opengl*/README file).

/usr/doc/opengl*/README says:

Add -lglut32 -lglu32 -lopengl32 to your link command (in that order).

>  Most of the
> stubs cannot be found. A sampling of the errors I get:
>
>
> ....undefined reference to `_glTexParameterf@12`
> ....undefined reference to`_glPixelStorei@8`
>
> A sign that I am probably missing some more basic libs is that I even get
> undefined references to __assert, as well as something mysterious called
> __imp__iob, which again looks like somethng unrelated to the opengl code I
> am compiling.
>
> I'd appreciate any help....

Try something simple, like compiling and linking the following example with
g++ -o helloGlut helloGlut.c -lglut32 -lglu32 -lopengl32

and report _all_ and _exact_ error messages to this list (not to me!).

---------------------- helloGlut.c ----------------------------
#include <GL/glut.h>

void display_func()
{
glClear(GL_COLOR_BUFFER_BIT);
}

int main(int argc, char* argv[])
{
glutInit(&argc, argv);
glutCreateWindow("Hello GLUT!");
glutDisplayFunc(display_func);
glutMainLoop();
return 0;
}
---------------------- helloGlut.c ----------------------------




André Bleau, Cygwin's OpenGL package maintainer.

Please address all questions and problem reports about Cygwin's OpenGL 
package to cygwin@cygwin.com . 


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