<div class="refentry" title="glVertexPointer"><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" title="C Specification"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glVertexPointer</b>(</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" title="Parameters"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><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" title="Description"><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"><span class="citerefentry"><span class="refentrytitle">glDrawArrays</span></span></a>,

or

<a class="citerefentry" href="glDrawElements"><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"><span class="citerefentry"><span class="refentrytitle">glEnableClientState</span></span></a>

and

<a class="citerefentry" href="glDisableClientState"><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"><span class="citerefentry"><span class="refentrytitle">glDrawArrays</span></span></a> or

<a class="citerefentry" href="glDrawElements"><span class="citerefentry"><span class="refentrytitle">glDrawElements</span></span></a>

is called.</p><p>Use

<a class="citerefentry" href="glDrawArrays"><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"><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" title="Notes"><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" title="Errors"><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 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" title="See Also"><a id="seealso"></a><h2>See Also</h2><p>

<a class="citerefentry" href="glColorPointer"><span class="citerefentry"><span class="refentrytitle">glColorPointer</span></span></a>,

<a class="citerefentry" href="glDrawArrays"><span class="citerefentry"><span class="refentrytitle">glDrawArrays</span></span></a>,

<a class="citerefentry" href="glDrawElements"><span class="citerefentry"><span class="refentrytitle">glDrawElements</span></span></a>,

<a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,

<a class="citerefentry" href="glNormalPointer"><span class="citerefentry"><span class="refentrytitle">glNormalPointer</span></span></a>,

<a class="citerefentry" href="glTexCoordPointer"><span class="citerefentry"><span class="refentrytitle">glTexCoordPointer</span></span></a>

</p></div><div class="refsect1" title="Copyright"><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>