Anti-Aliasing

To enable Anti-Aliasing:

(1) Enable blending

glEnable(GL_BLEND);

(2) Set the blending function to be GL_ONE_MINUS_SRC_ALPHA

glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

(3) Set the blend equation to GL_FUNC_ADD

glBlendEquation(GL_FUNC_ADD);

(4) Call the antialis functions

glEnable(GL_POINT_SMOOTH);
glEnable(GL_LINE_SMOOTH);
glEnable(GL_POLYGON_SMOOTH);