[andreuboada]

Hi!

I´m Andreu and I´m getting started with OpenGL. My operating system is Mac OS 10.6 and I´m using Netbeans to write my C++ code.

I found this code in a Computer Graphics textbook. However, I have many compilation errors and I´ve been surfing literally a myriad of forums and I don´t know what to do.

#include <iostream>
#include <stdio.h>
#include <OpenGL/gl.h>

void myinit(){
    glClearColor(1.0,1.0,1.0,1.0);
    glColor3f(1.0,0.0,0.0);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0.0,50.0,0.0,50.0);
    glMatrixMode(GL_MODELVIEW);
}

void display(){
    GLfloat vertices[3][2]={{0.0,0.0},{25.0,50.0},{50.0,0.0}};
    int i, j, k;
    int rand();
    GLfloat p[2]={7.5,5.0};
    glClear(GL_COLOR_BUFFER_BIT);
    glBegin(GL_POINTS);

    for(k=0; k<5000; k++){
        j=rand()*3;
        p[0]=(p[0]+vertices[j][0])/2.0;
        p[1]=(p[1]+vertices[j][1])/2.0;
        glVertex2fv(p);
    }

    glEnd();
    glFlush();
}


int main(int argc, char** argv) {
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(500,500);
    glutInitWindowPosition(0,0);
    glutCreateWindow("Sierpinski Gasket");
    glutDisplayFunc(display);
    myinit();
    glutMainLoop();
}

My compilation errors are:

main.cpp: In function 'void myinit()':
main.cpp:13: error: 'gluOrtho2D' was not declared in this scope
main.cpp: In function 'int main(int, char**)':
main.cpp:38: error: 'glutInit' was not declared in this scope
main.cpp:39: error: 'GLUT_SINGLE' was not declared in this scope
main.cpp:39: error: 'GLUT_RGB' was not declared in this scope
main.cpp:39: error: 'glutInitDisplayMode' was not declared in this scope
main.cpp:40: error: 'glutInitWindowSize' was not declared in this scope
main.cpp:41: error: 'glutInitWindowPosition' was not declared in this scope
main.cpp:42: error: 'glutCreateWindow' was not declared in this scope
main.cpp:43: error: 'glutDisplayFunc' was not declared in this scope
main.cpp:45: error: 'glutMainLoop' was not declared in this scope
make[2]: *** [build/Debug/GNU-MacOSX/main.o] Error 1
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2

I´d appreciate your help very much. I will attach my code in case it is necessary.

Thank you.