OpenGL Lesson 1

#if defined(linux) || defined(_WIN32)
#include <GL/glut.h>    /*Для Linux и Windows*/
#else
#include <GLUT/GLUT.h>  /*Для Mac OS*/
#endif

void reshape(int w, int h)
{
    glViewport(0, 0, w, h);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0, w, 0, h);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

void display()
{
    glClear(GL_COLOR_BUFFER_BIT);

    glBegin(GL_QUADS);
    glColor3f(1.0, 1.0, 1.0);
    glVertex2i(250, 450);
    glColor3f(0.0, 0.0, 1.0);
    glVertex2i(250, 150);
    glColor3f(0.0, 1.0, 0.0);
    glVertex2i(550, 150);
    glColor3f(1.0, 0.0, 0.0);
    glVertex2i(550, 450);
    glEnd();

    glutSwapBuffers();
}

int main (int argc, char * argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA);

    glutInitWindowSize(800, 600);
    glutCreateWindow("OpenGL lesson 1");

    glutReshapeFunc(reshape);
    glutDisplayFunc(display);

    glutMainLoop();

    return 0;
}