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<h2>GL Driver</h2>
<p>This driver represents a basic driver for all system-dependent drivers
implemented in the X-Windows system using the <a href="http://www.opengl.org/">
OpenGL</a> SDK. The implementation uses the OpenGL, GLU and GLX API functions.
For the font support, this driver uses the
<a href="http://homepages.paradise.net.nz/henryj/code/index.html#FTGL">FTGL</a>
API functions, which it was written against the
<a href="http://www.freetype.org/">Free Type</a> library.</p>
<h3>Behavior of Functions</h3>
<h4>Control </h4>
<ul>
<li><a href="../func/other.html#cdPlay">
<font face="Courier"><strong>Play</strong></font></a>: does nothing, returns
<font face="Courier">CD_ERROR</font>. </li>
</ul>
<h4>Coordinate System and Clipping </h4>
<ul>
<li>
<a href="../func/coordinates.html#cdUpdateYAxis">
<font face="Courier"><strong>UpdateYAxis</strong></font></a>: does nothing.</li>
<li>
<strong>Clipping</strong>: only support rectangular areas.</li>
<li>
<b>Complex Regions</b>: not supported.</li>
</ul>
<h4>Primitives</h4>
<ul>
<li><a href="../func/lines.html#cdBegin">
<font face="Courier"><strong>Begin</strong></font></a>: <strong><tt>CD_PATH</tt></strong>
is simulated.</li>
<li>Floating point primitives are supported.</li>
</ul>
<h4>Client Images</h4>
<ul>
<li>Images are bitmaps, and cannot be directly rotated or scaled.</li>
</ul>
<h4>Attributes </h4>
<ul>
<li>
<a href="../func/lines.html#cdLineStyle">
<font face="Courier"><strong>LineStyle</strong></font></a>: in <strong><tt>
CD_CUSTOM</tt></strong>, style patterns more than 16 bits are not supported.</li>
<li>
<a href="../func/lines.html#cdLineCap">
<font face="Courier"><strong>LineCap</strong></font></a>: does nothing.</li>
<li>
<a href="../func/lines.html#cdLineJoin">
<font face="Courier"><strong>LineJoin</strong></font></a>: does nothing.</li>
<li class="style1">
<a href="../func/filled.html#cdStipple"><font face="Courier"><strong>Stipple</strong></font></a>:
does nothing. There is no support for patterns more than 16 bits.</li>
<li class="style1">
<a href="../func/filled.html#cdPattern"><font face="Courier"><strong>Pattern</strong></font></a>:
does nothing.</li>
<li class="style1">
<a href="../func/filled.html#cdFillMode"><font face="Courier"><strong>
FillMode</strong></font></a>: does nothing.</li>
<li>
<a href="../func/text.html#cdNativeFont">
<font face="Courier"><strong>NativeFont</strong></font></a>: also accepts the
X-Windows font string format.</li>
<li><a href="../func/text.html#cdFont">
<font face="Courier"><strong>Font</strong></font></a>: "Courier" is mapped to
"Courier New", "Helvetica" is mapped to "Arial", and "Times" is mapped to
"Times New Roman". Underline and Strikeout are NOT supported.</li>
</ul>
<h4>Colors </h4>
<ul>
<li>
<a href="http://www.tecgraf.puc-rio.br/cd/en/func/color.html#cdPalette">
<font face="Courier"><strong>Palette</strong></font></a>: does nothing.</li>
</ul>
<h4>Exclusive Attributes</h4>
<ul>
<li>"<b><font face="Courier">ROTATE</font></b>": allows the usage of 1
angle and 1 coordinate (x, y), that define a global rotation transformation
centered in the specified coordinate. Use 1 real and 2 integer values inside a
string ("%g %d %d" = angle x y).</li>
</ul>
<ul>
<li><b><font face="Courier">"GLVERSION": </font></b>returns a string with
the OpenGL version or release number. It is empty if the OpenGL is not available.</li>
</ul>
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