opengl - what is wrong in the program below -

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i trying compile using command gcc -lgl -lglut ex2_6.c -o ex2_6. error given below.i got code @ ihis link http://www.glprogramming.com/red/chapter02.html.see example 2-6 on link.

hemkar@ubuntu:~$ gcc -lgl -lglut ex2_6.c -o ex2_6 /tmp/ccrgl3y9.o:ex2_6.c:function reshape: error: undefined reference 'gluortho2d' collect2: ld returned 1 exit status

code:

#include <gl/gl.h> #include <gl/glut.h>  void display(void) {    glubyte fly[] = {       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,       0x03, 0x80, 0x01, 0xc0, 0x06, 0xc0, 0x03, 0x60,        0x04, 0x60, 0x06, 0x20, 0x04, 0x30, 0x0c, 0x20,        0x04, 0x18, 0x18, 0x20, 0x04, 0x0c, 0x30, 0x20,       0x04, 0x06, 0x60, 0x20, 0x44, 0x03, 0xc0, 0x22,        0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,        0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,       0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,        0x66, 0x01, 0x80, 0x66, 0x33, 0x01, 0x80, 0xcc,        0x19, 0x81, 0x81, 0x98, 0x0c, 0xc1, 0x83, 0x30,       0x07, 0xe1, 0x87, 0xe0, 0x03, 0x3f, 0xfc, 0xc0,        0x03, 0x31, 0x8c, 0xc0, 0x03, 0x33, 0xcc, 0xc0,        0x06, 0x64, 0x26, 0x60, 0x0c, 0xcc, 0x33, 0x30,       0x18, 0xcc, 0x33, 0x18, 0x10, 0xc4, 0x23, 0x08,        0x10, 0x63, 0xc6, 0x08, 0x10, 0x30, 0x0c, 0x08,        0x10, 0x18, 0x18, 0x08, 0x10, 0x00, 0x00, 0x08};    glubyte halftone[] = {       0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,        0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,        0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,       0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,        0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,        0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,       0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,        0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,        0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,       0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,        0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,        0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,       0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,        0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,        0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,       0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55};     glclear (gl_color_buffer_bit);    glcolor3f (1.0, 1.0, 1.0);  /*  draw 1 solid, unstippled rectangle,       */       /*  2 stippled rectangles                */    glrectf (25.0, 25.0, 125.0, 125.0);    glenable (gl_polygon_stipple);    glpolygonstipple (fly);    glrectf (125.0, 25.0, 225.0, 125.0);    glpolygonstipple (halftone);    glrectf (225.0, 25.0, 325.0, 125.0);    gldisable (gl_polygon_stipple);     glflush (); }  void init (void)  {    glclearcolor (0.0, 0.0, 0.0, 0.0);    glshademodel (gl_flat);     }  void reshape (int w, int h) {    glviewport (0, 0, (glsizei) w, (glsizei) h);    glmatrixmode (gl_projection);    glloadidentity ();    gluortho2d (0.0, (gldouble) w, 0.0, (gldouble) h); }  int main(int argc, char** argv) {    glutinit(&argc, argv);    glutinitdisplaymode (glut_single | glut_rgb);    glutinitwindowsize (350, 150);    glutcreatewindow (argv[0]);    init ();    glutdisplayfunc(display);    glutreshapefunc(reshape);    glutmainloop();    return 0;   }

you trying use gluortho2d() without linking against opengl utility library.

try this:

gcc ex2_6.c -o ex2_6 -lgl -lglut -lglu

or switch glortho() , sidestep whole issue.


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