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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>glGetDebugMessageLog - 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="glGetDebugMessageLog"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetDebugMessageLog — retrieve messages from the debug message log</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">GLuint <b class="fsfunc">glGetDebugMessageLog</b>(</code></td><td>GLuint  </td><td><var class="pdparam">count</var>, </td></tr><tr><td> </td><td>GLsizei  </td><td><var class="pdparam">bufSize</var>, </td></tr><tr><td> </td><td>GLenum * </td><td><var class="pdparam">sources</var>, </td></tr><tr><td> </td><td>Glenum * </td><td><var class="pdparam">types</var>, </td></tr><tr><td> </td><td>GLuint * </td><td><var class="pdparam">ids</var>, </td></tr><tr><td> </td><td>GLenum * </td><td><var class="pdparam">severities</var>, </td></tr><tr><td> </td><td>GLsizei * </td><td><var class="pdparam">lengths</var>, </td></tr><tr><td> </td><td>GLchar * </td><td><var class="pdparam">messageLog</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>count</code></em></span></dt><dd><p>
                    The number of debug messages to retrieve from the log.
                </p></dd><dt><span class="term"><em class="parameter"><code>bufSize</code></em></span></dt><dd><p>
                    The size of the buffer whose address is given by <em class="parameter"><code>messageLog</code></em>.
                </p></dd><dt><span class="term"><em class="parameter"><code>sources</code></em></span></dt><dd><p>
                    The address of an array of variables to receive the sources of the retrieved messages.
                </p></dd><dt><span class="term"><em class="parameter"><code>types</code></em></span></dt><dd><p>
                    The address of an array of variables to receive the types of the retrieved messages.
                </p></dd><dt><span class="term"><em class="parameter"><code>ids</code></em></span></dt><dd><p>
                    The address of an array of unsigned integers to receive the ids of the retrieved messages.
                </p></dd><dt><span class="term"><em class="parameter"><code>severities</code></em></span></dt><dd><p>
                    The address of an array of variables to receive the severites of the retrieved messages.
                </p></dd><dt><span class="term"><em class="parameter"><code>lengths</code></em></span></dt><dd><p>
                    The address of an array of variables to receive the lengths of the received messages.
                </p></dd><dt><span class="term"><em class="parameter"><code>messageLog</code></em></span></dt><dd><p>
                    The address of an array of characters that will receive the messages.
                </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
            <code class="function">glGetDebugMessageLog</code> retrieves messages from the debug message log. A maximum of
            <em class="parameter"><code>count</code></em> messages are retrieved from the log. If <em class="parameter"><code>sources</code></em>
            is not NULL then the source of each message is written into up to <em class="parameter"><code>count</code></em> elements
            of the array. If <em class="parameter"><code>types</code></em>
            is not NULL then the type of each message is written into up to <em class="parameter"><code>count</code></em> elements
            of the array. If <em class="parameter"><code>id</code></em>
            is not NULL then the identifier of each message is written into up to <em class="parameter"><code>count</code></em> elements
            of the array. If <em class="parameter"><code>severities</code></em>
            is not NULL then the severity of each message is written into up to <em class="parameter"><code>count</code></em> elements
            of the array. If <em class="parameter"><code>lengths</code></em>
            is not NULL then the length of each message is written into up to <em class="parameter"><code>count</code></em> elements
            of the array.
        </p><p>
            <em class="parameter"><code>messageLog</code></em> specifies the address of a character array into which the debug messages
            will be written. Each message will be concatenated onto the array starting at the first element of <em class="parameter"><code>messageLog</code></em>.
            <em class="parameter"><code>bufSize</code></em> specifies the size of the array <em class="parameter"><code>messageLog</code></em>. If a message will not
            fit into the remaining space in <em class="parameter"><code>messageLog</code></em> then the function terminates and returns the number
            of messages written so far, which may be zero.
        </p><p>
            If <code class="function">glGetDebugMessageLog</code> returns zero then no messages are present in the debug log, or there
            was not enough space in <em class="parameter"><code>messageLog</code></em> to retrieve the first message in the queue. If <em class="parameter"><code>messageLog</code></em>
            is NULL then no messages are written and the value of <em class="parameter"><code>bufSize</code></em> is ignored.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
            Although debug messages may be enabled in a non-debug context, the quantity and detail of such messages may be substantially
            inferior to those in a debug context. In particular, a valid implementation of the debug message queue in a non-debug context
            may produce no messages at all.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>count</code></em> or <em class="parameter"><code>bufSize</code></em> is negative.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
            <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_DEBUG_LOGGED_MESSAGES</code>
        </p><p>
            <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_DEBUG_NEXT_LOGGED_MESSAGE_LENGTH</code>
        </p><p>
            <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAX_DEBUG_MESSAGE_LENGTH</code>
        </p><p>
            <a href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAX_DEBUG_LOGGED_MESSAGES</code>
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
            <a href="glDebugMessageInsert.xml"><span class="citerefentry"><span class="refentrytitle">glDebugMessageInsert</span></span></a>,
            <a href="glDebugMessageCallback.xml"><span class="citerefentry"><span class="refentrytitle">glDebugMessageCallback</span></span></a>,
            <a href="glDebugMessageControl.xml"><span class="citerefentry"><span class="refentrytitle">glDebugMessageControl</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>
