 of the open-source X.org DRI
    hardware drivers.
</li>
<li>Mesa is quite portable and allows OpenGL to be used on systems
    that have no other OpenGL solution.
</li>
<li>Software rendering with Mesa serves as a reference for validating the
    hardware drivers.
</li>
<li>A software implementation of OpenGL is useful for experimentation,
    such as testing new rendering techniques.
</li>
<li>Mesa can render images with deep color channels: 16-bit integer
    and 32-bit floating point color channels are