27. Antialiasing

• We have square pixels, which make the image look computer-generated

• The visual aspect of this is called "the jaggies"

• To eliminate, OpenGL uses blending of source with surrounding destination pixels:

  
      glEnable( GL_BLEND );
      glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
  
  

  Then:

  
      glEnable( GL_POINT_SMOOTH );
      glEnable( GL_LINE_SMOOTH );
      glEnable( GL_POYGON_SMOOTH );    // *** outdated and no longer supported