OpenGL

[Walter Valenti <waltervalenti@yahoo.it>]

Sto provando a cimentarmicon la programmazione OpenGL.
Ho installato i vari pacchetti "dev":

libglut3-dev,freeglut3-dev,libgl1-mesa-dev,libglu1-mesa-dev,mesa-common-dev.

Ho iniziato con un piccolo esempio preso dalla documentazione stessa.

#include <GL/gl.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)
         * OpenGL Programming Guide (Addison-Wesley Publishing Company)
         *
http://heron.cc.ukans.edu/ebt-bin/nph-dweb/dyna...G/@Generic__BookTextView/622;cs=fullhtml;pt=532
(10 of 16) [4/28/2000 9:44:16 PM]
         * */
        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 (background) 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; /* ISO C requires main to return int. */
}


Provando a compilarlo ho il seguente errore:
/tmp/ccIutZkT.o: In function `display':esempio.c:(.text+0xe): undefined
referenc e to `glClear'
:esempio.c:(.text+0x2d): undefined reference to `glColor3f'
:esempio.c:(.text+0x39): undefined reference to `glBegin'
:esempio.c:(.text+0x58): undefined reference to `glVertex3f'
:esempio.c:(.text+0x77): undefined reference to `glVertex3f'
:esempio.c:(.text+0x96): undefined reference to `glVertex3f'
:esempio.c:(.text+0xb5): undefined reference to `glVertex3f'
:esempio.c:(.text+0xba): undefined reference to `glEnd'
:esempio.c:(.text+0xbf): undefined reference to `glFlush'
/tmp/ccIutZkT.o: In function `init':esempio.c:(.text+0xef): undefined reference
to `glClearColor'
:esempio.c:(.text+0xfb): undefined reference to `glMatrixMode'
:esempio.c:(.text+0x100): undefined reference to `glLoadIdentity'
:esempio.c:(.text+0x12c): undefined reference to `glOrtho'
/tmp/ccIutZkT.o: In function `main':esempio.c:(.text+0x14e): undefined
reference  to `glutInit'
:esempio.c:(.text+0x15a): undefined reference to `glutInitDisplayMode'
:esempio.c:(.text+0x16e): undefined reference to `glutInitWindowSize'
:esempio.c:(.text+0x182): undefined reference to `glutInitWindowPosition'
:esempio.c:(.text+0x18e): undefined reference to `glutCreateWindow'
:esempio.c:(.text+0x19f): undefined reference to `glutDisplayFunc'
:esempio.c:(.text+0x1a4): undefined reference to `glutMainLoop'
collect2: ld returned 1 exit status


Qualcuno sa aiutarmi ?

Grazie
Walter


--
Per favore non inviatemi allegati in formato MS Office.
Utilizza alternativamente documenti in formato OpenDocument.

Software is like sex, it is better when it is free
--Linus B. Torvalds

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