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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>glGetShaderInfoLog - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glGetShaderInfoLog"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetShaderInfoLog — Returns the information log for a shader object</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glGetShaderInfoLog</strong>(</code></td><td>GLuint <var class="pdparam">shader</var>, </td></tr><tr><td> </td><td>GLsizei <var class="pdparam">maxLength</var>, </td></tr><tr><td> </td><td>GLsizei *<var class="pdparam">length</var>, </td></tr><tr><td> </td><td>GLchar *<var class="pdparam">infoLog</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>shader</code></em></span></dt><dd><p>Specifies the shader object whose information
log is to be queried.</p></dd><dt><span class="term"><em class="parameter"><code>maxLength</code></em></span></dt><dd><p>Specifies the size of the character buffer for
storing the returned information log.</p></dd><dt><span class="term"><em class="parameter"><code>length</code></em></span></dt><dd><p>Returns the length of the string returned in
<em class="parameter"><code>infoLog</code></em> (excluding the null
terminator).</p></dd><dt><span class="term"><em class="parameter"><code>infoLog</code></em></span></dt><dd><p>Specifies an array of characters that is used
to return the information log.</p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p><code class="function">glGetShaderInfoLog</code> returns the
information log for the specified shader object. The information
log for a shader object is modified when the shader is compiled.
The string that is returned will be null terminated.</p><p><code class="function">glGetShaderInfoLog</code> returns in
<em class="parameter"><code>infoLog</code></em> as much of the information log as
it can, up to a maximum of <em class="parameter"><code>maxLength</code></em>
characters. The number of characters actually returned,
excluding the null termination character, is specified by
<em class="parameter"><code>length</code></em>. If the length of the returned
string is not required, a value of <code class="constant">NULL</code> can
be passed in the <em class="parameter"><code>length</code></em> argument. The
size of the buffer required to store the returned information
log can be obtained by calling
<a class="citerefentry" href="glGetShader.xml"><span class="citerefentry"><span class="refentrytitle">glGetShader</span></span></a>
with the value <code class="constant">GL_INFO_LOG_LENGTH</code>.</p><p>The information log for a shader object is a string that
may contain diagnostic messages, warning messages, and other
information about the last compile operation. When a shader
object is created, its information log will be a string of
length 0.</p></div><div class="refsect1"><a id="notes"></a><h2>Notes</h2><p>The information log for a shader object is the OpenGL
implementer's primary mechanism for conveying information about
the compilation process. Therefore, the information log can be
helpful to application developers during the development
process, even when compilation is successful. Application
developers should not expect different OpenGL implementations to
produce identical information logs.</p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p><code class="constant">GL_INVALID_VALUE</code> is generated if
<em class="parameter"><code>shader</code></em> is not a value generated by
OpenGL.</p><p><code class="constant">GL_INVALID_OPERATION</code> is generated if
<em class="parameter"><code>shader</code></em> is not a shader object.</p><p><code class="constant">GL_INVALID_VALUE</code> is generated if
<em class="parameter"><code>maxLength</code></em> is less than 0.</p></div><div class="refsect1"><a id="associatedgets"></a><h2>Associated Gets</h2><p><a class="citerefentry" href="glGetShader.xml"><span class="citerefentry"><span class="refentrytitle">glGetShader</span></span></a>
with argument <code class="constant">GL_INFO_LOG_LENGTH</code></p><p><a class="citerefentry" href="glIsShader.xml"><span class="citerefentry"><span class="refentrytitle">glIsShader</span></span></a></p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p><a class="citerefentry" href="glCompileShader.xml"><span class="citerefentry"><span class="refentrytitle">glCompileShader</span></span></a>,
<a class="citerefentry" href="glGetProgramInfoLog.xml"><span class="citerefentry"><span class="refentrytitle">glGetProgramInfoLog</span></span></a>,
<a class="citerefentry" href="glLinkProgram.xml"><span class="citerefentry"><span class="refentrytitle">glLinkProgram</span></span></a>,
<a class="citerefentry" href="glValidateProgram.xml"><span class="citerefentry"><span class="refentrytitle">glValidateProgram</span></span></a></p></div><div class="refsect1"><a id="Copyright"></a><h2>Copyright</h2><p>
Copyright <span class="trademark"></span>© 2003-2005 3Dlabs Inc. Ltd.
Copyright <span class="trademark"></span>© 2010-2013 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 class="ulink" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
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