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3 | <?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" /><title>glGetVertexAttrib</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glGetVertexAttrib"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetVertexAttrib — Return a generic vertex attribute parameter</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">void <b class="fsfunc">glGetVertexAttribdv</b>(</code></td><td>GLuint </td><td><var class="pdparam">index</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLdouble * </td><td><var class="pdparam">params</var><code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em"><tr><td><code class="funcdef">void <b class="fsfunc">glGetVertexAttribfv</b>(</code></td><td>GLuint </td><td><var class="pdparam">index</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLfloat * </td><td><var class="pdparam">params</var><code>)</code>;</td></tr></table><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glGetVertexAttribiv</b>(</code></td><td>GLuint </td><td><var class="pdparam">index</var>, </td></tr><tr><td> </td><td>GLenum </td><td><var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLint * </td><td><var class="pdparam">params</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>index</code></em></span></dt><dd><p>Specifies the generic vertex attribute | |
4 | parameter to be queried.</p></dd><dt><span class="term"><em class="parameter"><code>pname</code></em></span></dt><dd><p>Specifies the symbolic name of the vertex | |
5 | attribute parameter to be queried. Accepted values are | |
6 | <code class="constant">GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING</code>, | |
7 | <code class="constant">GL_VERTEX_ATTRIB_ARRAY_ENABLED</code>, | |
8 | <code class="constant">GL_VERTEX_ATTRIB_ARRAY_SIZE</code>, | |
9 | <code class="constant">GL_VERTEX_ATTRIB_ARRAY_STRIDE</code>, | |
10 | <code class="constant">GL_VERTEX_ATTRIB_ARRAY_TYPE</code>, | |
11 | <code class="constant">GL_VERTEX_ATTRIB_ARRAY_NORMALIZED</code>, or | |
12 | <code class="constant">GL_CURRENT_VERTEX_ATTRIB</code>.</p></dd><dt><span class="term"><em class="parameter"><code>params</code></em></span></dt><dd><p>Returns the requested data.</p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p><code class="function">glGetVertexAttrib</code> returns in | |
13 | <em class="parameter"><code>params</code></em> the value of a generic vertex | |
14 | attribute parameter. The generic vertex attribute to be queried | |
15 | is specified by <em class="parameter"><code>index</code></em>, and the parameter | |
16 | to be queried is specified by <em class="parameter"><code>pname</code></em>.</p><p>The accepted parameter names are as follows:</p><div class="variablelist"><dl><dt><span class="term"><code class="constant">GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING</code></span></dt><dd><p> | |
17 | </p><p> <em class="parameter"><code>params</code></em> returns a | |
18 | single value, the name of the buffer object currently bound to | |
19 | the binding point corresponding to generic vertex attribute array | |
20 | <em class="parameter"><code>index</code></em>. If no buffer object is bound, | |
21 | 0 is returned. The initial value is 0.</p></dd><dt><span class="term"><code class="constant">GL_VERTEX_ATTRIB_ARRAY_ENABLED</code></span></dt><dd><p> | |
22 | </p><p> <em class="parameter"><code>params</code></em> returns a | |
23 | single value that is non-zero (true) if the vertex | |
24 | attribute array for <em class="parameter"><code>index</code></em> is | |
25 | enabled and 0 (false) if it is disabled. The initial | |
26 | value is <code class="constant">GL_FALSE</code>.</p></dd><dt><span class="term"><code class="constant">GL_VERTEX_ATTRIB_ARRAY_SIZE</code></span></dt><dd><p> | |
27 | </p><p> <em class="parameter"><code>params</code></em> returns a | |
28 | single value, the size of the vertex attribute array | |
29 | for <em class="parameter"><code>index</code></em>. The size is the | |
30 | number of values for each element of the vertex | |
31 | attribute array, and it will be 1, 2, 3, or 4. The | |
32 | initial value is 4.</p></dd><dt><span class="term"><code class="constant">GL_VERTEX_ATTRIB_ARRAY_STRIDE</code></span></dt><dd><p> | |
33 | </p><p> <em class="parameter"><code>params</code></em> returns a | |
34 | single value, the array stride for (number of bytes | |
35 | between successive elements in) the vertex attribute | |
36 | array for <em class="parameter"><code>index</code></em>. A value of 0 | |
37 | indicates that the array elements are stored | |
38 | sequentially in memory. The initial value is 0.</p></dd><dt><span class="term"><code class="constant">GL_VERTEX_ATTRIB_ARRAY_TYPE</code></span></dt><dd><p> | |
39 | </p><p> <em class="parameter"><code>params</code></em> returns a | |
40 | single value, a symbolic constant indicating the | |
41 | array type for the vertex attribute array for | |
42 | <em class="parameter"><code>index</code></em>. Possible values are | |
43 | <code class="constant">GL_BYTE</code>, | |
44 | <code class="constant">GL_UNSIGNED_BYTE</code>, | |
45 | <code class="constant">GL_SHORT</code>, | |
46 | <code class="constant">GL_UNSIGNED_SHORT</code>, | |
47 | <code class="constant">GL_INT</code>, | |
48 | <code class="constant">GL_UNSIGNED_INT</code>, | |
49 | <code class="constant">GL_FLOAT</code>, and | |
50 | <code class="constant">GL_DOUBLE</code>. The initial value is | |
51 | <code class="constant">GL_FLOAT</code>.</p></dd><dt><span class="term"><code class="constant">GL_VERTEX_ATTRIB_ARRAY_NORMALIZED</code></span></dt><dd><p> | |
52 | </p><p> <em class="parameter"><code>params</code></em> returns a | |
53 | single value that is non-zero (true) if fixed-point | |
54 | data types for the vertex attribute array indicated | |
55 | by <em class="parameter"><code>index</code></em> are normalized when | |
56 | they are converted to floating point, and 0 (false) | |
57 | otherwise. The initial value is | |
58 | <code class="constant">GL_FALSE</code>.</p></dd><dt><span class="term"><code class="constant">GL_CURRENT_VERTEX_ATTRIB</code></span></dt><dd><p> | |
59 | </p><p> <em class="parameter"><code>params</code></em> returns four | |
60 | values that represent the current value for the | |
61 | generic vertex attribute specified by index. Generic | |
62 | vertex attribute 0 is unique in that it has no | |
63 | current state, so an error will be generated if | |
64 | <em class="parameter"><code>index</code></em> is 0. The initial value | |
65 | for all other generic vertex attributes is | |
66 | (0,0,0,1).</p></dd></dl></div><p>All of the parameters except <code class="constant">GL_CURRENT_VERTEX_ATTRIB</code> | |
67 | represent client-side state.</p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p><code class="function">glGetVertexAttrib</code> is available only | |
68 | if the GL version is 2.0 or greater.</p><p>If an error is generated, no change is made to the | |
69 | contents of <em class="parameter"><code>params</code></em>.</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 | |
70 | <em class="parameter"><code>index</code></em> is greater than or equal to | |
71 | <code class="constant">GL_MAX_VERTEX_ATTRIBS</code>.</p><p><code class="constant">GL_INVALID_ENUM</code> is generated if | |
72 | <em class="parameter"><code>pname</code></em> is not an accepted value.</p><p><code class="constant">GL_INVALID_OPERATION</code> is generated if | |
73 | <em class="parameter"><code>index</code></em> is 0 and | |
74 | <em class="parameter"><code>pname</code></em> is | |
75 | <code class="constant">GL_CURRENT_VERTEX_ATTRIB</code>.</p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p><a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> | |
76 | with argument <code class="constant">GL_MAX_VERTEX_ATTRIBS</code></p><p><a class="citerefentry" href="glGetVertexAttribPointerv.xml"><span class="citerefentry"><span class="refentrytitle">glGetVertexAttribPointerv</span></span></a> | |
77 | with arguments <em class="parameter"><code>index</code></em> and | |
78 | <code class="constant">GL_VERTEX_ATTRIB_ARRAY_POINTER</code></p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p><a class="citerefentry" href="glBindAttribLocation.xml"><span class="citerefentry"><span class="refentrytitle">glBindAttribLocation</span></span></a>, | |
79 | <a class="citerefentry" href="glBindBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>, | |
80 | <a class="citerefentry" href="glDisableVertexAttribArray.xml"><span class="citerefentry"><span class="refentrytitle">glDisableVertexAttribArray</span></span></a>, | |
81 | <a class="citerefentry" href="glEnableVertexAttribArray.xml"><span class="citerefentry"><span class="refentrytitle">glEnableVertexAttribArray</span></span></a>, | |
82 | <a class="citerefentry" href="glVertexAttrib.xml"><span class="citerefentry"><span class="refentrytitle">glVertexAttrib</span></span></a>, | |
83 | <a class="citerefentry" 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> | |
84 | Copyright <span class="trademark"></span>© 2003-2005 3Dlabs Inc. Ltd. | |
85 | This material may be distributed subject to the terms and conditions set forth in | |
86 | the Open Publication License, v 1.0, 8 June 1999. | |
87 | <a class="ulink" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>. | |
88 | </p></div></div></body></html> |