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<?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>glPointParameter</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><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"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glPointParameterf</strong>(</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 border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glPointParameterx</strong>(</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"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><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"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glPointParameterfv</strong>(</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 border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glPointParameterxv</strong>(</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"><a id="parameters2"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><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"><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 class="variablelist"><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"><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"><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"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
        <a class="citerefentry" href="glGet.xml"><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.xml"><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.xml"><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.xml"><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"><a id="seealso"></a><h2>See Also</h2><p>
            <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,
            <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>,
            <a class="citerefentry" href="glLight.xml"><span class="citerefentry"><span class="refentrytitle">glLight</span></span></a>,
            <a class="citerefentry" href="glLightModel.xml"><span class="citerefentry"><span class="refentrytitle">glLightModel</span></span></a>
        </p></div><div class="refsect1"><a id="copyright"></a><h2>Copyright</h2><p>
            Copyright <span class="trademark"></span>© 2003-2004
            Silicon Graphics, Inc. This document is licensed under the SGI
            Free Software B License. For details, see
            <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
        </p></div></div></body></html>