#include <GL/glut.h>

void init();
void display();
void reshape(int w,int h);

int main(){
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowPosition(100,100);
    glutInitWindowSize(500,500);
    glutCreateWindow("test");
    init();
    glutReshapeFunc(reshape);
    glutDisplayFunc(display);
    glutIdleFunc(display);

    glutMainLoop();

    return 0;
}

void init(){
    glClearColor (0.0, 0.90, 1.0, 0.0);
}

void reshape(int w, int h){
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glViewport(0,0,w,h);
    gluPerspective(45.0f, w/h, 0.1f, 100.0f);
    glMatrixMode(GL_MODELVIEW);
}

void display(){
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    glTranslatef(0.0f,0.0f,-6.0f);
    glColor3f(1.0f,0.0f,0.0f);
    glBegin(GL_QUADS);
        glVertex3f( -1.0f, 1.0f, -1.5f);
        glVertex3f( -1.0f, -1.0f, -1.5f);
        glVertex3f( 1.0f, -1.0f, -1.5f);
        glVertex3f( 1.0f, 1.0f, -1.5f);
    glEnd();
    glColor3f(1.0f,1.0f,0.0f);
    glBegin(GL_TRIANGLES);
        glVertex3f( 0.0f, 1.0f, 0.0f);
        glVertex3f( -1.0f, -1.0f, 0.0f);
        glVertex3f( 1.0f, -1.0f, 0.0f);
    glEnd();

    glutSwapBuffers();
}