/* gcc -o template -L/usr/X11R6/lib -lX11 -lXi -lXmu -lglut -lGL -lGLU -lm  template.c */
#include<GL/gl.h>
#include<GL/glu.h>
#include<GL/glut.h>
#include<stdlib.h>
    
    
               
void display()
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glPushMatrix();


    glPopMatrix();
    glutSwapBuffers();
}           

void init()
{
    glClearColor(0.0,0.0,0.0,0.0);
    glClearDepth(1.0);
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glColor4f(1.0,1.0,1.0,1.0);
    glShadeModel(GL_SMOOTH);
    glEnable(GL_DEPTH_TEST);
}

void reshape(int w,int h)
{
    glViewport(0,0,(GLsizei)w,(GLsizei)h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-(GLsizei)w/2,(GLsizei)w/2,-(GLsizei)h/2,(GLsizei)h/2,-500,500);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}                          

void keyboard(unsigned char key, int x, int y)
{
    if(key == 27)
        exit(0);
}

           
int main(int argc,char **argv)
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_DEPTH);
    glutInitWindowSize(800,600);
    glutInitWindowPosition(100,100);
    glutCreateWindow(argv[0]);
    init();
    glutReshapeFunc(reshape);
    glutDisplayFunc(display);
    glutKeyboardFunc(keyboard);
       
    glutMainLoop();
    return 0;
}