<p>
Since the Xlib driver <em>emulates</em> the GLX extension, it's not
-totally conformance with a true GLX implementation.
+totally conformant with a true GLX implementation.
The differences are fairly obscure, however.
</p>
</p>
-<H2>X Display Modes</H2>
+<H2>X Visual Selection</H2>
<p>
Mesa supports RGB(A) rendering into almost any X visual type and depth.
</p>
</pre>
-<H2>Double buffering</H2>
+<H2>Double Buffering</H2>
<p>
Mesa can use either an X Pixmap or XImage as the backbuffer when in
double buffer mode. Using GLX, the default is to use an XImage. The
</p>
-<H2>Gamma correction</H2>
+<H2>Gamma Correction</H2>
<p>
To compensate for the nonlinear relationship between pixel values
and displayed intensities, there is a gamma correction feature in
</pre>
-<H2>HPCR glClear(GL_COLOR_BUFFER_BIT) dithering</H2>
+<H2>HPCR Dithering</H2>
<p>
If you set the <b>MESA_HPCR_CLEAR</b> environment variable then dithering
will be used when clearing the color buffer. This is only applicable
to HP systems with the HPCR (Color Recovery) feature.
+This incurs a small performance penalty.
</p>