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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" /><link rel="stylesheet" type="text/css" href="opengl-man.css" /><title>glDebugMessageCallback - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glDebugMessageCallback"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glDebugMessageCallback — specify a callback to receive debugging messages from the GL</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">glDebugMessageCallback</b>(</code></td><td>DEBUGPROC </td><td><var class="pdparam">callback</var>, </td></tr><tr><td> </td><td>void * </td><td><var class="pdparam">userParam</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>callback</code></em></span></dt><dd><p>
+ The address of a callback function that will be called when a debug message is generated.
+ </p></dd><dt><span class="term"><em class="parameter"><code>userParam</code></em></span></dt><dd><p>
+ A user supplied pointer that will be passed on each invocation of <em class="parameter"><code>callback</code></em>.
+ </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
+ <code class="function">glDebugMessageInsert</code> sets the current debug output callback function to
+ the function whose address is given in <em class="parameter"><code>callback</code></em>. The callback function
+ should have the following prototype (in C), or be otherwise compatible with such a prototype:
+ </p><pre class="programlisting"> typedef void (APIENTRY *DEBUGPROC)(GLenum source,
+ GLenum type,
+ GLuint id,
+ GLenum severity,
+ GLsizei length,
+ const GLchar* message,
+ void* userParam);</pre><p>
+ This function is defined to have the same calling convention as the GL API functions. In
+ most cases this is defined as <code class="code">APIENTRY</code>, although it will vary depending
+ on platform, language and compiler.
+ </p><p>
+ Each time a debug message is generated the debug callback function will be invoked
+ with <em class="parameter"><code>source</code></em>, <em class="parameter"><code>type</code></em>, <em class="parameter"><code>id</code></em>, and
+ <em class="parameter"><code>severity</code></em> associated with the message, and <em class="parameter"><code>length</code></em> set to
+ the length of debug message whose character string is in the array pointed to by <em class="parameter"><code>message</code></em>
+ <em class="parameter"><code>userParam</code></em> will be set to the value passed in the
+ <em class="parameter"><code>userParam</code></em> parameter to the most recent call to <code class="function">glDebugMessageInsert</code>.
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
+ When the GL is in use remotely, the server may not be able to call functions in the client's address space.
+ In such cases, the callback function may not be invoked and the user should retrieve debug messages from
+ the context's debug message log by calling <a href="glGetDebugMessageLog.xml"><span class="citerefentry"><span class="refentrytitle">glGetDebugMessageLog</span></span></a>.
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
+ <a href="glDebugMessageControl.xml"><span class="citerefentry"><span class="refentrytitle">glDebugMessageControl</span></span></a>,
+ <a href="glDebugMessageInsert.xml"><span class="citerefentry"><span class="refentrytitle">glDebugMessageInsert</span></span></a>,
+ <a href="glGetDebugMessageLog.xml"><span class="citerefentry"><span class="refentrytitle">glGetDebugMessageLog</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>© 2012 Khronos Group.
+ This material may be distributed subject to the terms and conditions set forth in
+ the Open Publication License, v 1.0, 8 June 1999.
+ <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
+ </p></div></div></body></html>
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