Thread: Problems in getting OpenGL to work

Hello,

I've been trying to get OpenGL to work for weeks now, and it's just not happening. Could someone please help me get it to work?

I am using the MinGW C compiler and have the following files in the correct folders within the MinGW folder:

opengl32.lib
glu32.lib
glut32.lib
gl.h
glu.h
glut.h

In system folder:
opengl32.dll
glu32.dll
glut32.dll

The following is the code that I am trying to get to work...

I'm fairly sure I'm not compiling it properly....but here it is anyway:

(This it not my code, it is from 'THE RED BOOK', and I just want to see if opengl is working before I start coding)

Code:

#include <windows.h>
#include <GL/glut.h>

void display(void)
{
/* clear all pixels  */
   glClear (GL_COLOR_BUFFER_BIT);

/* draw white polygon (rectangle) with corners at
 * (0.25, 0.25, 0.0) and (0.75, 0.75, 0.0)  
 */
   glColor3f (1.0, 1.0, 1.0);
   glBegin(GL_POLYGON);
      glVertex3f (0.25, 0.25, 0.0);
      glVertex3f (0.75, 0.25, 0.0);
      glVertex3f (0.75, 0.75, 0.0);
      glVertex3f (0.25, 0.75, 0.0);
   glEnd();

/* don't wait!  
 * start processing buffered OpenGL routines 
 */
   glFlush ();
}

void init (void) 
{
/* select clearing color 	*/
   glClearColor (0.0, 0.0, 0.0, 0.0);

/* initialize viewing values  */
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
}

/* 
 * Declare initial window size, position, and display mode
 * (single buffer and RGBA).  Open window with "hello"
 * in its title bar.  Call initialization routines.
 * Register callback function to display graphics.
 * Enter main loop and process events.
 */
int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
   glutInitWindowSize (250, 250); 
   glutInitWindowPosition (100, 100);
   glutCreateWindow ("hello");
   init ();
   glutDisplayFunc(display); 
   glutMainLoop();
   return 0;   /* ANSI C requires main to return int. */
}

Thanks in advance,

Stuart

I found that out the hard way when I was using DirectDraw. The stupid thing just wouldn't compile. I had no Internet at that time, so I used Microsoft technical support (ugh). You sit on the phone for ages, and then I felt so dumb when they told me to add the DirectX libraries to the link list.

I didn't put it in game programming,as I'm not going to be programming a game! But I see your point.

I compile using the following

gcc hello.c -o hello -lopengl32 -lglu32 -lglut32 -lglut

i still get 3 errors though, and can't work out what library I am missing.

Of course, not actually saying what the errors are will of course lead to a speedy answer

C:\DOCUM~1\EVESHA~1\LOCALS~1\Temp/ccIlbaaa.o(.text+0x1c):hello.c:
undefined reference to '__glutCreateWithExit@12'

C:\DOCUM~1\EVESHA~1\LOCALS~1\Temp/ccIlbaaa.o(.text+0x3c):hello.c:
undefined reference to '__glutCreateWindowsWithExit@8'


C:\DOCUM~1\EVESHA~1\LOCALS~1\Temp/ccIlbaaa.o(.text+0x5c):hello.c:
undefined reference to '__glutCreateMenuWithExit@8'

collect2: ld returned 1 exit status