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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>glEdgeFlagPointer</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glEdgeFlagPointer"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glEdgeFlagPointer — define an array of edge flags</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glEdgeFlagPointer</b>(</code></td><td>GLsizei  </td><td><var class="pdparam">stride</var>, </td></tr><tr><td> </td><td>const GLvoid *  </td><td><var class="pdparam">pointer</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>stride</code></em></span></dt><dd><p>
                    Specifies the byte offset between consecutive edge flags.
                    If <em class="parameter"><code>stride</code></em> is 0, the edge flags 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 edge flag in the array. The initial
                    value is 0.
                </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
            <code class="function">glEdgeFlagPointer</code> specifies the location and data format of an array of boolean edge
            flags to use when rendering. <em class="parameter"><code>stride</code></em> specifies the byte stride from one
            edge flag to the next, allowing vertices and attributes
            to be packed into a single array or stored in separate arrays.
        </p><p>
            If a non-zero named buffer object is bound to the <code class="constant">GL_ARRAY_BUFFER</code> target 
            (see <a class="citerefentry" href="glBindBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>) while an edge flag array is
            specified, <em class="parameter"><code>pointer</code></em> is treated as a byte offset into the buffer object's data store.
            Also, the buffer object binding (<code class="constant">GL_ARRAY_BUFFER_BINDING</code>) is saved as edge flag vertex array
            client-side state (<code class="constant">GL_EDGE_FLAG_ARRAY_BUFFER_BINDING</code>).
        </p><p>
            When an edge flag array is
            specified, <em class="parameter"><code>stride</code></em> and <em class="parameter"><code>pointer</code></em> are saved as client-side
            state, in addition to the current vertex array buffer object binding.
        </p><p>
            To enable and disable the edge flag 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_EDGE_FLAG_ARRAY</code>. If
            enabled, the edge flag array is used
            when <a class="citerefentry" href="glDrawArrays.xml"><span class="citerefentry"><span class="refentrytitle">glDrawArrays</span></span></a>, <a class="citerefentry" href="glMultiDrawArrays.xml"><span class="citerefentry"><span class="refentrytitle">glMultiDrawArrays</span></span></a>, <a class="citerefentry" href="glDrawElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawElements</span></span></a>,
            <a class="citerefentry" href="glMultiDrawElements.xml"><span class="citerefentry"><span class="refentrytitle">glMultiDrawElements</span></span></a>, <a class="citerefentry" href="glDrawRangeElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawRangeElements</span></span></a>, or
            <a class="citerefentry" href="glArrayElement.xml"><span class="citerefentry"><span class="refentrytitle">glArrayElement</span></span></a> is called.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
            <code class="function">glEdgeFlagPointer</code> is available only if the GL version is 1.1 or greater.
        </p><p>
            Edge flags are not supported for interleaved vertex array formats
            (see <a class="citerefentry" href="glInterleavedArrays.xml"><span class="citerefentry"><span class="refentrytitle">glInterleavedArrays</span></span></a>).
        </p><p>
            The edge flag array is initially disabled and isn't accessed when
            <a class="citerefentry" href="glArrayElement.xml"><span class="citerefentry"><span class="refentrytitle">glArrayElement</span></span></a>, <a class="citerefentry" href="glDrawElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawElements</span></span></a>, <a class="citerefentry" href="glDrawRangeElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawRangeElements</span></span></a>,
            <a class="citerefentry" href="glDrawArrays.xml"><span class="citerefentry"><span class="refentrytitle">glDrawArrays</span></span></a>, <a class="citerefentry" href="glMultiDrawArrays.xml"><span class="citerefentry"><span class="refentrytitle">glMultiDrawArrays</span></span></a>, or <a class="citerefentry" href="glMultiDrawElements.xml"><span class="citerefentry"><span class="refentrytitle">glMultiDrawElements</span></span></a>
            is called.
        </p><p>
            Execution of <code class="function">glEdgeFlagPointer</code> is not allowed between the execution of
            <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>,
            but an error may or may not be generated. If no error is generated,
            the operation is undefined.
        </p><p>
            <code class="function">glEdgeFlagPointer</code> is typically implemented on the client side.
        </p><p>
            Edge flag array parameters are client-side state and are therefore
            not saved or restored by <a class="citerefentry" href="glPushAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPushAttrib</span></span></a> and <a class="citerefentry" href="glPopAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPopAttrib</span></span></a>.
            Use <a class="citerefentry" href="glPushClientAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPushClientAttrib</span></span></a> and
            <a class="citerefentry" href="glPopClientAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPopClientAttrib</span></span></a> instead.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
            <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>stride</code></em> is negative.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
            <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_EDGE_FLAG_ARRAY</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_EDGE_FLAG_ARRAY_STRIDE</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_EDGE_FLAG_ARRAY_BUFFER_BINDING</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_ARRAY_BUFFER_BINDING</code>
        </p><p>
            <a class="citerefentry" href="glGetPointerv.xml"><span class="citerefentry"><span class="refentrytitle">glGetPointerv</span></span></a> with argument <code class="constant">GL_EDGE_FLAG_ARRAY_POINTER</code>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
            <a class="citerefentry" href="glArrayElement.xml"><span class="citerefentry"><span class="refentrytitle">glArrayElement</span></span></a>,
            <a class="citerefentry" href="glBindBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>,
            <a class="citerefentry" href="glColorPointer.xml"><span class="citerefentry"><span class="refentrytitle">glColorPointer</span></span></a>,
            <a class="citerefentry" href="glDisableClientState.xml"><span class="citerefentry"><span class="refentrytitle">glDisableClientState</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="glDrawRangeElements.xml"><span class="citerefentry"><span class="refentrytitle">glDrawRangeElements</span></span></a>,
            <a class="citerefentry" href="glEdgeFlag.xml"><span class="citerefentry"><span class="refentrytitle">glEdgeFlag</span></span></a>,
            <a class="citerefentry" href="glEnableClientState.xml"><span class="citerefentry"><span class="refentrytitle">glEnableClientState</span></span></a>,
            <a class="citerefentry" href="glFogCoordPointer.xml"><span class="citerefentry"><span class="refentrytitle">glFogCoordPointer</span></span></a>,
            <a class="citerefentry" href="glIndexPointer.xml"><span class="citerefentry"><span class="refentrytitle">glIndexPointer</span></span></a>,
            <a class="citerefentry" href="glInterleavedArrays.xml"><span class="citerefentry"><span class="refentrytitle">glInterleavedArrays</span></span></a>,
            <a class="citerefentry" href="glMultiDrawArrays.xml"><span class="citerefentry"><span class="refentrytitle">glMultiDrawArrays</span></span></a>,
            <a class="citerefentry" href="glMultiDrawElements.xml"><span class="citerefentry"><span class="refentrytitle">glMultiDrawElements</span></span></a>,
            <a class="citerefentry" href="glNormalPointer.xml"><span class="citerefentry"><span class="refentrytitle">glNormalPointer</span></span></a>,
            <a class="citerefentry" href="glPopClientAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPopClientAttrib</span></span></a>,
            <a class="citerefentry" href="glPushClientAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glPushClientAttrib</span></span></a>,
            <a class="citerefentry" href="glSecondaryColorPointer.xml"><span class="citerefentry"><span class="refentrytitle">glSecondaryColorPointer</span></span></a>,
            <a class="citerefentry" href="glTexCoordPointer.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoordPointer</span></span></a>,
            <a class="citerefentry" href="glVertexAttribPointer.xml"><span class="citerefentry"><span class="refentrytitle">glVertexAttribPointer</span></span></a>,
            <a class="citerefentry" href="glVertexPointer.xml"><span class="citerefentry"><span class="refentrytitle">glVertexPointer</span></span></a>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
            Copyright <span class="trademark"></span>© 1991-2006
            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>
