title: How to use alpha transparency in OpenGL?
body: <p>Here's my code:</p>
  
  <pre><code>void display(void);
  
  int main(int argc, char** argv)
  {
      glutInit(&amp;argc, argv);
      glutInitDisplayMode(GLUT_SINGLE|GLUT_RGBA);
      glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
      glEnable( GL_BLEND );
      glutInitWindowSize(600,600);
      glutInitWindowPosition(200,50);
      glutCreateWindow("glut test");
      glutDisplayFunc(display);
      glutMainLoop();
      return 0;
  }
  
  void display()
  {
      glClear(GL_COLOR_BUFFER_BIT);
      glPointSize(8);
      glBegin(GL_POINTS);
      glColor4f(.23,.78,.32,1.0);
      glVertex2f(0,0);
      glColor4f(.23,.78,.32,0.1);
      glVertex2f(0.1,0);
      glEnd();
      glFlush();
  }
  </code></pre>
  
  <p>The problem is that these two points appear identical (even when I set the alpha to 0). Is there something I missed to enable alpha transparency?</p>