OpenGL States

On/off (e.g., depth buffer test)

1. glEnable( GLenum )
2. glDisable( GLenum )
3. Examples:
4. glEnable(GL_DEPTH_TEST);
5. glDisable(GL_LIGHTING);

Mode States

1. Once the mode is set the effect stays until reset

     Examples:
    glShadeModel(GL_FLAT) or glShadeModel(GL_SMOOTH)
    glLightModel(…) etc.