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7<title>glGetActiveAttrib</title>
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10<h1>glGetActiveAttrib Function</h1>
11<h2>Syntax</h2>
12    <div class="section">
13      <pre class="definition">
14GL_APICALL void GL_APIENTRY glGetActiveAttrib(
15     GLuint program,
16     GLuint index,
17     GLsizei bufsize,
18     GLsizei * length,
19     GLint * size,
20     GLenum * type,
21     char * name
22);
23</pre>
24    </div>
25<h2>Parameters</h2>
26    <div class="section">
27      <table class="arguments">
28        <thead>
29          <tr>
30            <td width="15" />
31<th>Name</th>
32<td>Description</td>
33          </tr>
34        </thead>
35        <tr>
36<td>in</td>
37<th>program</th>
38<td>Program object</td>
39        </tr>
40        <tr>
41<td>in</td>
42<th>index</th>
43<td>Vertex attribute index</td>
44        </tr>
45        <tr>
46<td>in</td>
47<th>bufsize</th>
48<td>Size of the buffer specified by <span class="argument">name</span></td>
49        </tr>
50        <tr>
51<td>out</td>
52<th>length</th>
53<td>Region storing the number of bytes in the string written to <span class="argument">name</span></td>
54        </tr>
55        <tr>
56<td>out</td>
57<th>size</th>
58<td>Region storing the vertex attribute size</td>
59        </tr>
60        <tr>
61<td>out</td>
62<th>type</th>
63<td>Region storing the vertex attribute type</td>
64        </tr>
65        <tr>
66<td>out</td>
67<th>name</th>
68<td>Array storing the vertex attribute name</td>
69        </tr> </table>
70    </div>
71<h2>Return Values</h2>
72<div class="section">No values are returned. </div>
73<h2>Description</h2>
74    <div class="section">
75<p>Gets information about an active vertex attribute.</p><P>
76Set <span class="argument">program</span> to the program object.
77            </P><P>
78Set <span class="argument">index</span> to a value that is greater than or equal to 0 and is at least one less than the value that can be obtained from <code>glGetProgramiv</code> with <code>GL_ACTIVE_ATTRIBUTES</code> specified.
79            </P><P>
80Set <span class="argument">bufsize</span> to the size of the buffer specified in <span class="argument">name</span>.
81            </P><P>
82The name, size (number of components), and data type of the active vertex attribute specified by <span class="argument">index</span> in the object given by <span class="argument">program</span> are stored in <span class="argument">name</span>, <span class="argument">size</span>, and <span class="argument">type</span>, respectively.
83            </P><P>
84The <span class="argument">length</span> argument stores the size (in bytes) of the string saved in <span class="argument">name</span>.
85            </P><P>
86If the number of characters in the vertex attribute name exceeds <span class="argument">bufsize</span>, then <span class="argument">bufsize</span>-1 characters are copied into <span class="argument">name</span> and NULL is inserted at the end.
87            </P><P>
88This function generates the following errors.
89<TABLE><TR><TH>GL_INVALID_VALUE</TH><TD>The <span class="argument">program</span> or <span class="argument">index</span> argument was set to an invalid value, or <span class="argument">bufsize</span> was set to a negative value.</TD></TR><TR><TH>GL_INVALID_OPERATION</TH><TD>The <span class="argument">program</span> argument is not linked correctly.</TD></TR></TABLE><!-- source                                      program、indexに不正な値を指定した場合、bufsizeに負の値を指定した場合エラーGL_INVALID_VALUEを生成します。 programが正しくリンクされていない場合エラーGL_INVALID_OPERATIONを生成します。                 --></P></div>
90<h2>Revision History</h2>
91    <div class="section">
92      <dl class="history">
93        <dt>2010/01/07</dt>
94<dd>Initial version.<br />
95        </dd>
96      </dl>
97    </div>
98  <hr><p>CONFIDENTIAL</p></body>
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