Open GL 기본틀(노랑바탕에 빨강 사각형)

// 컴퓨터그래픽스 교재 P174 예제

#include<glut.h>
#include<gl.h>
#include<glu.h>

void MyDisplay(){
 glClear(GL_COLOR_BUFFER_BIT);
 glColor3f(1.0,0.0,0.0);
 glBegin(GL_POLYGON);
  glVertex3f(-0.5,-0.5,0.0);
  glVertex3f(0.5,-0.5,0.0);
  glVertex3f(0.5,0.5,0.0);
  glVertex3f(-0.5,0.5,0.0);
  glEnd();
  glFlush();
}
int main()
{
 glutCreateWindow("OpenGL Drawing Example");
 glClearColor(255,255,0.0,0.0);
 glutDisplayFunc(MyDisplay);
 glutMainLoop();
 return 0;
}