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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>glVertexPointer</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glVertexPointer"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glVertexPointer — define an array of vertex coordinates</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">glVertexPointer</strong>(</code></td><td>GLint <var class="pdparam">size</var>, </td></tr><tr><td> </td><td>GLenum <var class="pdparam">type</var>, </td></tr><tr><td> </td><td>GLsizei <var class="pdparam">stride</var>, </td></tr><tr><td> </td><td>const GLvoid * <var class="pdparam">pointer</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>size</code></em>
                </span></dt><dd><p>Specifies the number of coordinates per vertex.
                    Must be 2, 3, or 4. The initial value is 4.</p></dd><dt><span class="term">
                    <em class="parameter"><code>type</code></em>
                </span></dt><dd><p>Specifies the data type of each vertex coordinate in the
                    array. Symbolic constants
                    <code class="constant">GL_BYTE</code>,
                    <code class="constant">GL_SHORT</code>, and
                    <code class="constant">GL_FIXED</code>, are accepted.
                    However, the initial value is
                    <code class="constant">GL_FLOAT</code>.</p><p>
                        The common profile accepts the symbolic constant
                        <code class="constant">GL_FLOAT</code> as well.
                    </p></dd><dt><span class="term">
                    <em class="parameter"><code>stride</code></em>
                </span></dt><dd><p>Specifies the byte offset between consecutive
                    vertices. If <em class="parameter"><code>stride</code></em>
                    is 0, the vertices are understood to be tightly packed in
                    the array. The initial value is 0.</p></dd><dt><span class="term">
                    <em class="parameter"><code>pointer</code></em>
                </span></dt><dd><p>Specifies a pointer to the first coordinate of the
                    first vertex in the array. The initial value is 0.</p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
        <code class="function">glVertexPointer</code>
        specifies the location and data of an array of vertex
        coordinates to use when rendering. <em class="parameter"><code>size</code></em>
        specifies the number of coordinates per vertex and
        <em class="parameter"><code>type</code></em> the data type of the coordinates.
        <em class="parameter"><code>stride</code></em>
        specifies the byte stride from one vertex to the next allowing
        vertices and attributes to be packed into a single array or
        stored in separate arrays. (Single-array storage may be more
        efficient on some implementations.)
        </p><p>
        When a vertex array is
        specified,
        <em class="parameter"><code>size</code></em>,
        <em class="parameter"><code>type</code></em>,
        <em class="parameter"><code>stride</code></em>, and
        <em class="parameter"><code>pointer</code></em> are saved as client-side state.</p><p>If the vertex array is enabled, it is used when
        <a class="citerefentry" href="glDrawArrays.xml"><span class="citerefentry"><span class="refentrytitle">glDrawArrays</span></span></a>,
        or
        <a class="citerefentry" href="glDrawElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawElements</span></span></a>
        is called.
        To enable and disable the vertex array, call
        <a class="citerefentry" href="glEnableClientState.xml"><span class="citerefentry"><span class="refentrytitle">glEnableClientState</span></span></a>
        and
        <a class="citerefentry" href="glDisableClientState.xml"><span class="citerefentry"><span class="refentrytitle">glDisableClientState</span></span></a>
        with the argument
        <code class="constant">GL_VERTEX_ARRAY</code>.
        The vertex array is initially disabled and isn't accessed when
        <a class="citerefentry" href="glDrawArrays.xml"><span class="citerefentry"><span class="refentrytitle">glDrawArrays</span></span></a> or
        <a class="citerefentry" href="glDrawElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawElements</span></span></a>
        is called.</p><p>Use
        <a class="citerefentry" href="glDrawArrays.xml"><span class="citerefentry"><span class="refentrytitle">glDrawArrays</span></span></a>
        to construct a sequence of primitives (all of the same type)
        from prespecified vertex and vertex attribute arrays. Use
        <a class="citerefentry" href="glDrawElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawElements</span></span></a>
        to construct a sequence of primitives by indexing vertices and
        vertex attributes.</p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>
        <code class="function">glVertexPointer</code>
        is typically implemented on the client side.</p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p><code class="constant">GL_INVALID_VALUE</code> is generated if
        <em class="parameter"><code>size</code></em> is not 2, 3, or 4.</p><p><code class="constant">GL_INVALID_ENUM</code> is generated if
        <em class="parameter"><code>type</code></em> is not an accepted value.</p><p><code class="constant">GL_INVALID_VALUE</code> is generated if
        <em class="parameter"><code>stride</code></em> is negative.</p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
        <a class="citerefentry" href="glColorPointer.xml"><span class="citerefentry"><span class="refentrytitle">glColorPointer</span></span></a>,
        <a class="citerefentry" href="glDrawArrays.xml"><span class="citerefentry"><span class="refentrytitle">glDrawArrays</span></span></a>,
        <a class="citerefentry" href="glDrawElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawElements</span></span></a>,
        <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,
        <a class="citerefentry" href="glNormalPointer.xml"><span class="citerefentry"><span class="refentrytitle">glNormalPointer</span></span></a>,
        <a class="citerefentry" href="glTexCoordPointer.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoordPointer</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>