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glPointParameter.xhtml
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<div class="refentry" title="glPointParameter"><a id="glPointParameter"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glPointParameter — specify parameters for point rasterization</p></div><div class="refsynopsisdiv" title="C Specification"><h2>C Specification</h2><div class="funcsynopsis"><table class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glPointParameterf</b>(</code></td><td>GLenum <var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLfloat <var class="pdparam">param</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glPointParameterx</b>(</code></td><td>GLenum <var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLfixed <var class="pdparam">param</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Parameters"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term">
<em class="parameter"><code>pname</code></em>
</span></dt><dd><p>
Specifies the single-valued parameter to be updated.
Can be either
<code class="constant">GL_POINT_SIZE_MIN</code>,
<code class="constant">GL_POINT_SIZE_MAX</code>, or
<code class="constant">GL_POINT_FADE_THRESHOLD_SIZE</code>.
</p></dd><dt><span class="term">
<em class="parameter"><code>param</code></em>
</span></dt><dd><p>
Specifies the value that the parameter will be set to.
</p></dd></dl></div></div><div class="refsynopsisdiv" title="C Specification"><h2>C Specification</h2><div class="funcsynopsis"><table class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glPointParameterfv</b>(</code></td><td>GLenum <var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>const GLfloat * <var class="pdparam">params</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glPointParameterxv</b>(</code></td><td>GLenum <var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>const GLfixed * <var class="pdparam">params</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Parameters"><a id="parameters2"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term">
<em class="parameter"><code>pname</code></em>
</span></dt><dd><p>
Specifies the parameter to be updated.
Can be either
<code class="constant">GL_POINT_SIZE_MIN</code>,
<code class="constant">GL_POINT_SIZE_MAX</code>,
<code class="constant">GL_POINT_FADE_THRESHOLD_SIZE</code>, or
<code class="constant">GL_POINT_DISTANCE_ATTENUATION</code>.
</p></dd><dt><span class="term">
<em class="parameter"><code>params</code></em>
</span></dt><dd><p>
Specifies a pointer to the value or values that
<em class="parameter"><code>pname</code></em>
will be set to.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="description"></a><h2>Description</h2><p>
<code class="function">glPointParameter</code>
assigns values to point parameters.
</p><p>
<code class="function">glPointParameter</code>
takes two arguments.
<em class="parameter"><code>pname</code></em>,
specifies which of several parameters will be modified.
<em class="parameter"><code>params</code></em>,
specifies what value or values will be assigned to the
specified parameter.
</p><p>
The parameters that can be specified using
<code class="function">glPointParameter</code>,
and their interpretations are as follows:
</p><div class="variablelist"><dl><dt><span class="term">
<code class="constant">GL_POINT_SIZE_MIN</code>
</span></dt><dd><p>
<em class="parameter"><code>param</code></em> specifies,
or <em class="parameter"><code>params</code></em>
points to the lower bound to which
the derived point size is clamped.
</p></dd><dt><span class="term">
<code class="constant">GL_POINT_SIZE_MAX</code>
</span></dt><dd><p>
<em class="parameter"><code>param</code></em> specifies,
or <em class="parameter"><code>params</code></em>
points to the upper bound to which
the derived point size is clamped.
</p></dd><dt><span class="term">
<code class="constant">GL_POINT_FADE_THRESHOLD_SIZE</code>
</span></dt><dd><p>
<em class="parameter"><code>param</code></em> specifies,
or <em class="parameter"><code>params</code></em>
points to the point fade threshold.
</p></dd><dt><span class="term">
<code class="constant">GL_POINT_DISTANCE_ATTENUATION</code>
</span></dt><dd><p>
<em class="parameter"><code>params</code></em>
points to the distance attenuation function coefficients
<code class="constant">a</code>,
<code class="constant">b</code>, and
<code class="constant">c</code>.
</p></dd></dl></div></div><div class="refsect1" title="Notes"><a id="notes"></a><h2>Notes</h2><p>
If the point size lower bound is greater than the upper bound,
then the point size after clamping is undefined.
</p></div><div class="refsect1" title="Errors"><a id="errors"></a><h2>Errors</h2><p>
<code class="constant">GL_INVALID_ENUM</code> is generated if
<em class="parameter"><code>pname</code></em>
is not an accepted value.
</p><p>
<code class="constant">GL_INVALID_VALUE</code> is generated
if assigned values for
<code class="constant">GL_POINT_SIZE_MIN</code>,
<code class="constant">GL_POINT_SIZE_MAX</code>, or
<code class="constant">GL_POINT_FADE_THRESHOLD_SIZE</code>
are less then <code class="constant">zero</code>.
</p></div><div class="refsect1" title="Associated Gets"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>
with argument <code class="constant">GL_POINT_DISTANCE_ATTENUATION</code></p><p>
<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>
with argument <code class="constant">GL_POINT_FADE_THRESHOLD_SIZE</code></p><p>
<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>
with argument <code class="constant">GL_POINT_SIZE_MAX</code></p><p>
<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>
with argument <code class="constant">GL_POINT_SIZE_MIN</code></p></div><div class="refsect1" title="See Also"><a id="seealso"></a><h2>See Also</h2><p>
<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,
<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>,
<a class="citerefentry" href="glLight"><span class="citerefentry"><span class="refentrytitle">glLight</span></span></a>,
<a class="citerefentry" href="glLightModel"><span class="citerefentry"><span class="refentrytitle">glLightModel</span></span></a>
</p></div><div class="refsect1" title="Copyright"><a id="copyright"></a><h2>Copyright</h2><p>
Copyright © 2003-2004
Silicon Graphics, Inc. This document is licensed under the SGI
Free Software B License. For details, see
<a class="ulink" href="https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/" target="_top">https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/</a>.
</p></div></div>