/* gcc -Wall -o test test.c -lGL -lglut */
#include <GL/gl.h>
#include <GL/glut.h>

void render()
{
    GLfloat x, y, z;
    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);

    glColor3f(1.0f, 1.0f, 1.0f);
    glBegin(GL_LINES);
        for (z=0.0f; z <= 100.0f; z += 1.0f) {
            for (y=0.0f; y <= 100.0f; y += 1.0f) {
                for (x=0.0f; x <= 100.0f; x += 1.0f) {
                    glVertex3f(-x, -y, -z);
                    glVertex3f(x, y, z);
                }
            }
        }
    glEnd();
    glutSwapBuffers();
}

void changesize(GLsizei w, GLsizei h)
{
    glViewport(0,0,w,h);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-100.0f, 100.0f, -100.0f, 100.0f, -100.0f, 100.0f);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

int main(int argc, char *argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowSize(800,800);
    glutCreateWindow("Test");
    glutDisplayFunc(render);
    glutReshapeFunc(changesize);
    glutMainLoop();
    return 0;
}