#include <GL/glut.h>

void display(void)
{
    glClearColor(0, 0, 0, 0);
    glClear(GL_COLOR_BUFFER_BIT);

    glColor3f(0,0,0);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(-2, 2, -2, 2);

    glBegin(GL_POINTS);
        glVertex2f(-0.5, -0.5);
        glVertex2f(-0.5, 0.5);
        glVertex2f(0.5,0.5);
    glEnd();



}

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(500, 500);
    glutCreateWindow("GLUT: Exercicio 1");
    
    glutDisplayFunc(display);
    glutMainLoop();
    
    return 0;
}