#include <gl/gl.h>
#include <gl/glut.h>


bool init()
{
    glClearColor(0.93f, 0.93f, 0.93f, 0.0f);
    glColor3f(0.0f, 0.0f, 0.0f);

    return true;
}

void display()
{
    glClear(GL_COLOR_BUFFER_BIT);
    glBegin(GL_QUADS);
        glVertex2f(-0.5, 0.5);
        glVertex2f(-0.5, -0.5);
        glVertex2f(0.5, -0.5);
        glVertex2f(0.5, 0.5);
    glEnd();
    glFlush();
    glutSwapBuffers();
}

int main(int argc, char *argv[])
{
glutInit(&argc, argv);
glutInitWindowPosition(50, 50);
glutInitWindowSize(500, 500);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    
glutCreateWindow("Drawing using GLUT");

glutDisplayFunc(display);

if (!init())
    return 1;

glutMainLoop();

return 0;
}

glMatrixMode (GL_PROJECTION);
gluOrtho2D (0.0, 400.0, 0.0, 300.0);