glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glRotatef(90.0f,0.0f,0.0f,1.0f);
glColor3f(1.0f,1.0f,1.0f);
glBegin(GL_TRIANGLES); 
glVertex2f( 200, 600); 
glVertex2f(400,400); 
glVertex2f( 600,600); 
glEnd();