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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=
"glGetActiveSubroutineName"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glGetActiveSubroutineName — query the name of an active shader subroutine
</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">glGetActiveSubroutineName
</b>(
</code></td><td>GLuint
</td><td><var class=
"pdparam">program
</var>,
</td></tr><tr><td> </td><td>GLenum
</td><td><var class=
"pdparam">shadertype
</var>,
</td></tr><tr><td> </td><td>GLuint
</td><td><var class=
"pdparam">index
</var>,
</td></tr><tr><td> </td><td>GLsizei
</td><td><var class=
"pdparam">bufsize
</var>,
</td></tr><tr><td> </td><td>GLsizei *
</td><td><var class=
"pdparam">length
</var>,
</td></tr><tr><td> </td><td>GLchar *
</td><td><var class=
"pdparam">name
</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>program
</code></em></span></dt><dd><p>
5 Specifies the name of the program containing the subroutine.
6 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>shadertype
</code></em></span></dt><dd><p>
7 Specifies the shader stage from which to query the subroutine name.
8 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>index
</code></em></span></dt><dd><p>
9 Specifies the index of the shader subroutine uniform.
10 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>bufsize
</code></em></span></dt><dd><p>
11 Specifies the size of the buffer whose address is given in
<em class=
"parameter"><code>name
</code></em>.
12 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>length
</code></em></span></dt><dd><p>
13 Specifies the address of a variable which is to receive the length of the shader subroutine uniform name.
14 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>name
</code></em></span></dt><dd><p>
15 Specifies the address of an array into which the name of the shader subroutine uniform will be written.
16 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
17 <code class=
"function">glGetActiveSubroutineName
</code> queries the name of an active shader subroutine uniform from the
18 program object given in
<em class=
"parameter"><code>program
</code></em>.
<em class=
"parameter"><code>index
</code></em> specifies the index of
19 the shader subroutine uniform within the shader stage given by
<em class=
"parameter"><code>stage
</code></em>, and must between
20 zero and the value of
<code class=
"constant">GL_ACTIVE_SUBROUTINES
</code> minus one for the shader stage.
22 The name of the selected subroutine is returned as a null-terminated string in
<em class=
"parameter"><code>name
</code></em>. The
23 actual number of characters written into
<em class=
"parameter"><code>name
</code></em>, not including the null-terminator, is
24 is returned in
<em class=
"parameter"><code>length
</code></em>. If
<em class=
"parameter"><code>length
</code></em> is
<code class=
"constant">NULL
</code>,
25 no length is returned. The maximum number of characters that may be written into
<em class=
"parameter"><code>name
</code></em>,
26 including the null-terminator, is given in
<em class=
"parameter"><code>bufsize
</code></em>.
27 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
28 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if
<em class=
"parameter"><code>index
</code></em> is greater than or equal to
29 the value of
<code class=
"constant">GL_ACTIVE_SUBROUTINES
</code>.
31 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if
<em class=
"parameter"><code>program
</code></em> is not the name of an
32 existing program object.
33 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"associatedgets"></a><h2>Associated Gets
</h2><p>
34 <a href=
"glGetProgramStage.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetProgramStage
</span></span></a> with argument
<code class=
"constant">GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH
</code>
35 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
36 <a href=
"glGetSubroutineIndex.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetSubroutineIndex
</span></span></a>,
37 <a href=
"glGetActiveSubroutineUniform.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetActiveSubroutineUniform
</span></span></a>,
38 <a href=
"glGetProgramStage.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetProgramStage
</span></span></a>
39 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
40 Copyright
<span class=
"trademark"></span>©
2010 Khronos Group.
41 This material may be distributed subject to the terms and conditions set forth in
42 the Open Publication License, v
1.0,
8 June
1999.
43 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
44 </p></div></div></body></html>
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