<div class="refentry" title="glPointSizePointerOES"><a id="glPointSizePointerOES"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glPointSizePointerOES — define an array of point sizes</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">glPointSizePointerOES</b>(</code></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>type</code></em>

</span></dt><dd><p>

Specifies the data type of each point size in the

array. Symbolic constant

<code class="constant">GL_FIXED</code> is accepted.

However, the common profile also accepts the symbolic constant

<code class="constant">GL_FLOAT</code>.

The initial value is

<code class="constant">GL_FIXED</code> for the common lite profile,

or <code class="constant">GL_FLOAT</code> for the common profile.

</p></dd><dt><span class="term">

<em class="parameter"><code>stride</code></em>

</span></dt><dd><p>

Specifies the byte offset between consecutive

point sizes. If <em class="parameter"><code>stride</code></em>

is 0, the point sizes are understood to be tightly packed in

the array.

The initial value is <code class="constant">0</code>.

</p></dd><dt><span class="term">

<em class="parameter"><code>pointer</code></em>

</span></dt><dd><p>

Specifies a pointer to the point size of the

first vertex in the array.

The initial value is <code class="constant">0</code>.

</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="description"></a><h2>Description</h2><p>

<code class="function">glPointSizePointerOES</code>

specifies the location and data of an array of point sizes

to use when rendering points.

<em class="parameter"><code>type</code></em> specifies the data type of the coordinates.

<em class="parameter"><code>stride</code></em>

specifies the byte stride from one point size 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>

The point sizes supplied in the

point size arrays will be the sizes used to render

both points and point sprites.

</p><p>

Distance-based attenuation works in conjunction with

<code class="constant">GL_POINT_SIZE_ARRAY_OES</code>.

If distance-based attenuation is enabled

the point size from the point size array will be attenuated as defined by

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

to compute the final point size.

</p><p>

When a point size array is

specified,

<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 point size array is enabled, it is used to control

the sizes used to render points and point sprites.

To enable and disable the point size 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_POINT_SIZE_ARRAY_OES</code>.

The point size array is initially disabled.

</p></div><div class="refsect1" title="Notes"><a id="notes"></a><h2>Notes</h2><p>

<code class="function">glPointSizePointerOES</code> is only supported

if the OpenGL ES version number is 1.1 or greater.

</p><p>

If point size array is enabled, the point

size defined by

<code class="function">glPointSize</code>

is ignored.

</p><p>

<code class="function">glPointSizePointerOES</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_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="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="glPointParameter"><span class="citerefentry"><span class="refentrytitle">glPointParameter</span></span></a>,

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