#include <GL/glut.h>

void ohinit(void)
{
　　glClearColor(0.0,0.0,0.4,0.0);
　　glFrontFace(GL_CW);
　　glEnable(GL_CULL_FACE);
　　glCullFace(GL_BACK);
}

void ohreshape(int w,int h)
{
　　glViewport(0,0,(GLsizei)w,(GLsizei)h);
　　glMatrixMode(GL_PROJECTION);
　　glLoadIdentity();
　　gluOrtho2D(-1.2,1.2,-1.2,1.2);
　　glMatrixMode(GL_MODELVIEW);
}

void ohdraw(void)
{
　　glBegin(GL_TRIANGLE_FAN);
　　glColor3f(0.0,0.0,1.0); glVertex3f(0.0,0.0,1.0);
　　glColor3f(1.0,0.0,0.0); glVertex3f(1.0,0.0,0.0);
　　glColor3f(0.0,1.0,0.0); glVertex3f(0.0,1.0,0.0);
　　glColor3f(0.0,1.0,1.0); glVertex3f(-1.0,0.0,0.0);
　　glColor3f(1.0,0.0,1.0); glVertex3f(0.0,-1.0,0.0);
　　glColor3f(1.0,0.0,0.0); glVertex3f(1.0,0.0,0.0);
　　glEnd();

　　glBegin(GL_TRIANGLE_FAN);
　　glColor3f(1.0,1.0,0.0); glVertex3f(0.0,0.0,-1.0);
　　glColor3f(1.0,0.0,0.0); glVertex3f(1.0,0.0,0.0);
　　glColor3f(1.0,0.0,1.0); glVertex3f(0.0,-1.0,0.0);
　　glColor3f(0.0,1.0,1.0); glVertex3f(-1.0,0.0,0.0);
　　glColor3f(0.0,1.0,0.0); glVertex3f(0.0,1.0,0.0);
　　glColor3f(1.0,0.0,0.0); glVertex3f(1.0,0.0,0.0);
　　glEnd();
}