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renderer=
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"text/css" href=
"opengl-man.css" /><title>glGetAttribLocation
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.69.1" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glGetAttribLocation"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glGetAttribLocation — Returns the location of an attribute variable
</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">GLint
<b class=
"fsfunc">glGetAttribLocation
</b>(
</code></td><td>GLuint
</td><td><var class=
"pdparam">program
</var>,
</td></tr><tr><td> </td><td>const 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>Specifies the program object to be
5 queried.
</p></dd><dt><span class=
"term"><em class=
"parameter"><code>name
</code></em></span></dt><dd><p>Points to a null terminated string containing
6 the name of the attribute variable whose location is
7 to be queried.
</p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p><code class=
"function">glGetAttribLocation
</code> queries the
8 previously linked program object specified by
9 <em class=
"parameter"><code>program
</code></em> for the attribute variable
10 specified by
<em class=
"parameter"><code>name
</code></em> and returns the index
11 of the generic vertex attribute that is bound to that attribute
12 variable. If
<em class=
"parameter"><code>name
</code></em> is a matrix attribute
13 variable, the index of the first column of the matrix is
14 returned. If the named attribute variable is not an active
15 attribute in the specified program object or if
16 <em class=
"parameter"><code>name
</code></em> starts with the reserved prefix
17 "gl_", a value of -
1 is returned.
</p><p>The association between an attribute variable name and a
18 generic attribute index can be specified at any time by calling
19 <a href=
"glBindAttribLocation.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBindAttribLocation
</span></span></a>.
20 Attribute bindings do not go into effect until
21 <a href=
"glLinkProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glLinkProgram
</span></span></a>
22 is called. After a program object has been linked successfully,
23 the index values for attribute variables remain fixed until the
24 next link command occurs. The attribute values can only be
25 queried after a link if the link was successful.
26 <code class=
"function">glGetAttribLocation
</code> returns the binding
27 that actually went into effect the last time
28 <a href=
"glLinkProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glLinkProgram
</span></span></a>
29 was called for the specified program object. Attribute bindings
30 that have been specified since the last link operation are not
31 returned by
<code class=
"function">glGetAttribLocation
</code>.
</p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p><code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
32 <em class=
"parameter"><code>program
</code></em> is not a value generated by
33 OpenGL.
</p><p><code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
34 <em class=
"parameter"><code>program
</code></em> is not a program object.
</p><p><code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
35 <em class=
"parameter"><code>program
</code></em> has not been successfully
36 linked.
</p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"associatedgets"></a><h2>Associated Gets
</h2><p><a href=
"glGetActiveAttrib.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetActiveAttrib
</span></span></a>
37 with argument
<em class=
"parameter"><code>program
</code></em> and the index of an
38 active attribute
</p><p><a href=
"glIsProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glIsProgram
</span></span></a></p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p><a href=
"glBindAttribLocation.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBindAttribLocation
</span></span></a>,
39 <a href=
"glLinkProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glLinkProgram
</span></span></a>,
40 <a href=
"glVertexAttrib.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glVertexAttrib
</span></span></a>,
41 <a href=
"glVertexAttribPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glVertexAttribPointer
</span></span></a></p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
42 Copyright
<span class=
"trademark"></span>©
2003-
2005 3Dlabs Inc. Ltd.
43 This material may be distributed subject to the terms and conditions set forth in
44 the Open Publication License, v
1.0,
8 June
1999.
45 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
46 </p></div></div></body></html>
HCoop / clinton / guile-figl.git / blob