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C++ OPENGL help wanted to port glbegin and end

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I have this code in openGL, which works, but I would like to eliminate the glbegin and glend to meet OpenGL ES standards.

Can anyone out there assist me on figuring out how to do this? Thanks


#include "painter.hpp"
#include "GL/glut.h"

void Painter::bar(int x1, int y1, int x2, int y2)
  glColor3f(0, 1, 0);
  glVertex2f(x1, y1);
  glVertex2f(x2, y1);
  glVertex2f(x2, y2);
  glVertex2f(x1, y2);

void Painter::circle(int x, int y, int radius)
  glColor3f(1, 0, 0);
  glVertex2f(x + radius, y);
  glVertex2f(x, y + radius);
  glVertex2f(x - radius, y); 
  glVertex2f(x, y - radius);


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