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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=
"glBindFragDataLocationIndexed"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glBindFragDataLocationIndexed — bind a user-defined varying out variable to a fragment shader color number and index
</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">glBindFragDataLocationIndexed
</b>(
</code></td><td>GLuint
</td><td><var class=
"pdparam">program
</var>,
</td></tr><tr><td> </td><td>GLuint
</td><td><var class=
"pdparam">colorNumber
</var>,
</td></tr><tr><td> </td><td>GLuint
</td><td><var class=
"pdparam">index
</var>,
</td></tr><tr><td> </td><td>const char *
</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 The name of the program containing varying out variable whose binding to modify
6 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>colorNumber
</code></em></span></dt><dd><p>
7 The color number to bind the user-defined varying out variable to
8 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>index
</code></em></span></dt><dd><p>
9 The index of the color input to bind the user-defined varying out variable to
10 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>name
</code></em></span></dt><dd><p>
11 The name of the user-defined varying out variable whose binding to modify
12 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
13 <code class=
"function">glBindFragDataLocationIndexed
</code> specifies that the varying out variable
<em class=
"parameter"><code>name
</code></em> in
14 <em class=
"parameter"><code>program
</code></em> should be bound to fragment color
<em class=
"parameter"><code>colorNumber
</code></em> when the program is next
15 linked.
<em class=
"parameter"><code>index
</code></em> may be zero or one to specify that the color be used as either the first or second color
16 input to the blend equation, respectively.
18 The bindings specified by
<code class=
"function">glBindFragDataLocationIndexed
</code> have no effect until
<em class=
"parameter"><code>program
</code></em>
19 is next linked. Bindings may be specified at any time after
<em class=
"parameter"><code>program
</code></em> has been created. Specifically,
20 they may be specified before shader objects are attached to the program. Therefore, any name may be specified in
<em class=
"parameter"><code>name
</code></em>,
21 including a name that is never used as a varying out variable in any fragment shader object. Names beginning with
<code class=
"constant">gl_
</code> are
24 If
<em class=
"parameter"><code>name
</code></em> was bound previously, its assigned binding is replaced with
<em class=
"parameter"><code>colorNumber
</code></em> and
25 <em class=
"parameter"><code>index
</code></em>.
<em class=
"parameter"><code>name
</code></em> must be a null-terminated string.
<em class=
"parameter"><code>index
</code></em> must be less than or equal to one,
26 and
<em class=
"parameter"><code>colorNumber
</code></em> must be less than the value of
<code class=
"constant">GL_MAX_DRAW_BUFFERS
</code> if
<em class=
"parameter"><code>index
</code></em>
27 is zero, and less than the value of
<code class=
"constant">GL_MAX_DUAL_SOURCE_DRAW_BUFFERS
</code> if index is greater than or equal to one.
29 In addition to the errors generated by
<code class=
"function">glBindFragDataLocationIndexed
</code>, the
30 program
<em class=
"parameter"><code>program
</code></em> will fail to link if:
31 </p><div class=
"itemizedlist"><ul type=
"disc"><li><p>
32 The number of active outputs is greater than the value
<code class=
"constant">GL_MAX_DRAW_BUFFERS
</code>.
34 More than one varying out variable is bound to the same color number.
35 </p></li></ul></div><p>
36 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
37 Varying out varyings may have locations assigned explicitly in the shader text using a
<code class=
"code">location
</code>
38 layout qualifier. If a shader statically assigns a location to a varying out variable in the shader text,
39 that location is used and any location assigned with
<code class=
"function">glBindFragDataLocation
</code> is ignored.
40 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
41 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if
<em class=
"parameter"><code>colorNumber
</code></em> is greater than or equal to
<code class=
"constant">GL_MAX_DRAW_BUFFERS
</code>.
43 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if
<em class=
"parameter"><code>colorNumber
</code></em> is greater than or equal to
<code class=
"constant">GL_MAX_DUAL_SOURCE_DRAW_BUFERS
</code>
44 and
<em class=
"parameter"><code>index
</code></em> is greater than or equal to one.
46 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if
<em class=
"parameter"><code>index
</code></em> is greater than one.
48 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<em class=
"parameter"><code>name
</code></em> starts with the reserved
<code class=
"constant">gl_
</code> prefix.
50 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if
<code class=
"function">program
</code> is not the name of a program object.
51 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"associatedgets"></a><h2>Associated Gets
</h2><p>
52 <a href=
"glGetFragDataLocation.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetFragDataLocation
</span></span></a> with a valid program object
53 and the the name of a user-defined varying out variable
55 <a href=
"glGetFragDataIndex.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetFragDataIndex
</span></span></a> with a valid program object
56 and the the name of a user-defined varying out variable
57 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
58 <a href=
"glCreateProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glCreateProgram
</span></span></a>,
59 <a href=
"glLinkProgram.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glLinkProgram
</span></span></a>
60 <a href=
"glGetFragDataLocation.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetFragDataLocation
</span></span></a>,
61 <a href=
"glGetFragDataIndex.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetFragDataIndex
</span></span></a>
62 <a href=
"glBindFragDataLocation.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBindFragDataLocation
</span></span></a>
63 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
64 Copyright
<span class=
"trademark"></span>©
2010 Khronos Group.
65 This material may be distributed subject to the terms and conditions set forth in
66 the Open Publication License, v
1.0,
8 June
1999.
67 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
68 </p></div></div></body></html>